dergachev/README.md

## README.md

      
    Raw
  

              README.md
            
          
    rule-of-thirds bookmarklet that overlays a rule-of-thirds style grid over all images on a page.
To get the bookmarklet, visit http://bl.ocks.org/4331769

Bookmarklet Development Notes

Do the following to be able to use the "RuleOfThirds-localhost" development
version of the bookmarklet:
# checkout the gist
git clone https://gist.github.com/4331769.git ~/code/rule-of-thirds
# start a mini webserver, to enable http://localhost:9090/rule-of-thirds.bookmarklet.js
cd ~/code/rule-of-thirds
python -m SimpleHTTPServer 9090 
When you're done, kill the server via CTRL-C.
TODO


Figure out how to collect usage statistics


analytics on script tag referrer data? make sure no effect on performance


Create a feedback mechanism (eg feedback tab for bug reporting)
Ensure rule-of-thirds.bookmarklet.js doesnt get re-injected needlessly


see http://stackoverflow.com/questions/7373993/how-to-enforce-a-bookmarklet-to-run-only-once


Start using jsfiddle for examples/test cases


eg http://jsfiddle.net/wE2BN/

Dev Links

CSS:

http://stackoverflow.com/questions/8049276/can-you-overlay-a-transparent-css3-gradient-over-a-background-image/8049370#8049370
https://developer.mozilla.org/en-US/docs/CSS/background-size
http://www.w3schools.com/cssref/css3_pr_background-size.asp
http://stackoverflow.com/questions/5123489/how-to-overlay-a-play-button-over-a-youtube-thumbnail-image/5123612#5123612
http://jsfiddle.net/gbU3H/1/ (another bookmarklet that tries to do rule-of-thirds overlay)

SVG:

http://www.svgbasics.com/lines.html
http://stackoverflow.com/questions/5069006/change-attributes-defined-in-defs-on-use-element
http://oreilly.com/catalog/svgess/chapter/ch03.html#t1
http://www.scribd.com/doc/62408083/SVG-Essentials#outer_page_77 (also can find google book version)

Misc:

http://stackoverflow.com/questions/3039818/jquery-include-css/3039915#3039915
http://stackoverflow.com/questions/530787/simple-http-web-server/532710#532710

Bookmarklet:

http://coding.smashingmagazine.com/2010/05/23/make-your-own-bookmarklets-with-jquery/
http://betterexplained.com/articles/how-to-make-a-bookmarklet-for-your-web-application/
http://subsimple.com/bookmarklets/tips.asp

Canvas:

http://billmill.org/static/canvastutorial/color.html
http://diveintohtml5.info/canvas.html
http://stackoverflow.com/questions/10433046/creating-a-canvas-element-and-setting-its-width-and-height-attributes

jQuery position:

http://stackoverflow.com/questions/158070/jquery-how-to-position-one-element-relative-to-another/2781557#2781557
http://api.jquery.com/position/ (the core jquery position() method)
http://wiki.jqueryui.com/w/page/12138026/Position (jqery UI position(attr) method)
http://jqueryui.com/position/
http://view.jqueryui.com/master/ui/jquery.ui.position.js (source code)
http://css-tricks.com/jquery-ui-position-function/

Require-JS:

http://www.requirejs.org/jqueryui-amd/example/webapp/app.html
http://stackoverflow.com/questions/12113172/how-do-i-use-jquery-ui-with-requirejs
http://requirejs.org/docs/api.html#config-shim
requirejs/requirejs#509
http://stackoverflow.com/questions/4918084/pro-and-cons-on-using-requirejs-over-labjs-or-viceversa
http://msdn.microsoft.com/en-us/magazine/ff943568.aspx

YepNope-JS:

http://yepnopejs.com/#api
http://stackoverflow.com/questions/3782649/whats-the-best-way-to-utilize-jquery-ui-theme-on-cdn-with-local-fallback/5609065#5609065
http://news.ycombinator.com/item?id=1955074

Pages to Test:

http://www.flickr.com/photos/wallacesilva/6230440322/
http://500px.com/photo/2177596
http://en.wikipedia.org/wiki/File:Vermeer-view-of-delft.jpg
http://pinterest.com/dergachev/beyond-rule-of-thirds-lecture/
http://evolvingweb.ca/
http://bl.ocks.org/4331769
http://www.fabiovisentin.com/blog/45.ashx (problem as of jan 4)

Photography:

http://pamphotography.wordpress.com/2011/08/06/the-golden-ratio-phi-and-photography/
http://photoinf.com/Golden_Mean/


## index.html
<html>
  <title>rule-of-thirds.js bookmarklet</title>
  <head>
    <style type="text/css">
      .button-wrapper {
        margin: 2em 0;
      }
      .inline-button,
      .button {
        /* base64 encoder: http://www.greywyvern.com/code/php/binary2base64 */
        /* Source image: http://tiny.cc/public/images/default-favicon.ico */
        background-image: url(data:image/vnd.microsoft.icon;base64,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);
        background-repeat: no-repeat;
        background-color: #65a9d7;
        background-position: 10px center;
        padding: 10px 20px 10px 32px;
        border-radius: 8px;
        color: white;
        font-size: 18px;
        font-family: 'Lucida Grande', Helvetica, Arial, Sans-Serif;
        text-decoration: none;
      }
      .inline-button {
        display: inline;
        background-color: transparent;
        padding-right: 3px;
        padding-left: 28px;
        font-size: 1em;
        background-size: 13px 13px;
      }
      .inline-button a {
        text-decoration: none;
        color: #65a9d7;
      }
      body {
        padding: 20px;
        font-family: Helvetica, Arial, sans-serif;
        font-size: .9em;
        color: #444;
      }
      p {
        line-height: 1.5em;
        margin: .5em 0 1em 0;
      }
      ul {
        line-height: 2em;
        list-style-type: none;
        padding-left: 1em;
      }
    </style>
</head>
<body>
<section data-markdown>

To install the bookmarklet, [drag it to your bookmark toolbar](http://dl-web.dropbox.com/u/29440342/screenshots/HEILHU-2013.1.2-18.52.png), after which you can run it on any webpage with interesting images.

<div class="button-wrapper"><a class="button" href="javascript:(function(){var s = document.createElement('script');s.src = 'https://gist.github.com/raw/4331769/cdffe1f17ccda7eeadd1a732753ce067aba4147f/rule-of-thirds.bookmarklet.js';document.body.appendChild(s);})();">RuleOfThirds</a></div>

The above is the January 2, 2012 release of rule-of-thirds.bookmarklet.js. For
development purposes, I've also created the following variants of the
bookmarklet. Since the dated release is more stable and secure, only use these
if you know what you're doing.

* <div class="inline-button"><a href="javascript:(function(){var s = document.createElement('script');s.src='https://gist.github.com/raw/4331769/rule-of-thirds.bookmarklet.js';document.body.appendChild(s);})();">RuleOfThirds-HEAD</a></div>
https://gist.github.com/raw/4331769/rule-of-thirds.bookmarklet.js
* <div class="inline-button"><a href="javascript:(function(){var s = document.createElement('script');s.src='http://localhost:9090/rule-of-thirds.bookmarklet.js?time'+(new Date().getTime());document.body.appendChild(s);})();">RuleOfThirds-localhost</a></div>
http://localhost:9090/rule-of-thirds.bookmarklet.js?time=12345678

Feel free to try out the bookmarklet with some famous photographs:

<a data-pin-do="embedBoard" href="http://pinterest.com/dergachev/beyond-rule-of-thirds-lecture/"></a>
</section>

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/showdown/0.3.1/showdown.min.js"></script>
<script>
// adapted from http://blog.harakys.com/blog/2012/02/21/embed-markdown-into-your-html/
// see also https://gist.github.com/1343518
    [].forEach.call( document.querySelectorAll('[data-markdown]'), function  fn(elem){
      var html      = (new Showdown.converter()).makeHtml(elem.innerHTML);
      elem.innerHTML = html;
    });
</script>
<script type="text/javascript" src="http://assets.pinterest.com/js/pinit.js" ></script>
</body>
</html>

## jquery.ui.position.js
/*!
 * jQuery UI Position @VERSION
 * http://jqueryui.com
 *
 * Copyright 2012 jQuery Foundation and other contributors
 * Released under the MIT license.
 * http://jquery.org/license
 *
 * http://api.jqueryui.com/position/
 */
(function( $, undefined ) {

$.ui = $.ui || {};

var cachedScrollbarWidth,
	max = Math.max,
	abs = Math.abs,
	round = Math.round,
	rhorizontal = /left|center|right/,
	rvertical = /top|center|bottom/,
	roffset = /[\+\-]\d+%?/,
	rposition = /^\w+/,
	rpercent = /%$/,
	_position = $.fn.position;

function getOffsets( offsets, width, height ) {
	return [
		parseInt( offsets[ 0 ], 10 ) * ( rpercent.test( offsets[ 0 ] ) ? width / 100 : 1 ),
		parseInt( offsets[ 1 ], 10 ) * ( rpercent.test( offsets[ 1 ] ) ? height / 100 : 1 )
	];
}

function parseCss( element, property ) {
	return parseInt( $.css( element, property ), 10 ) || 0;
}

function getDimensions( elem ) {
	var raw = elem[0];
	if ( raw.nodeType === 9 ) {
		return {
			width: elem.width(),
			height: elem.height(),
			offset: { top: 0, left: 0 }
		};
	}
	if ( $.isWindow( raw ) ) {
		return {
			width: elem.width(),
			height: elem.height(),
			offset: { top: elem.scrollTop(), left: elem.scrollLeft() }
		};
	}
	if ( raw.preventDefault ) {
		return {
			width: 0,
			height: 0,
			offset: { top: raw.pageY, left: raw.pageX }
		};
	}
	return {
		width: elem.outerWidth(),
		height: elem.outerHeight(),
		offset: elem.offset()
	};
}

$.position = {
	scrollbarWidth: function() {
		if ( cachedScrollbarWidth !== undefined ) {
			return cachedScrollbarWidth;
		}
		var w1, w2,
			div = $( "<div style='display:block;width:50px;height:50px;overflow:hidden;'><div style='height:100px;width:auto;'></div></div>" ),
			innerDiv = div.children()[0];

		$( "body" ).append( div );
		w1 = innerDiv.offsetWidth;
		div.css( "overflow", "scroll" );

		w2 = innerDiv.offsetWidth;

		if ( w1 === w2 ) {
			w2 = div[0].clientWidth;
		}

		div.remove();

		return (cachedScrollbarWidth = w1 - w2);
	},
	getScrollInfo: function( within ) {
		var overflowX = within.isWindow ? "" : within.element.css( "overflow-x" ),
			overflowY = within.isWindow ? "" : within.element.css( "overflow-y" ),
			hasOverflowX = overflowX === "scroll" ||
				( overflowX === "auto" && within.width < within.element[0].scrollWidth ),
			hasOverflowY = overflowY === "scroll" ||
				( overflowY === "auto" && within.height < within.element[0].scrollHeight );
		return {
			width: hasOverflowX ? $.position.scrollbarWidth() : 0,
			height: hasOverflowY ? $.position.scrollbarWidth() : 0
		};
	},
	getWithinInfo: function( element ) {
		var withinElement = $( element || window ),
			isWindow = $.isWindow( withinElement[0] );
		return {
			element: withinElement,
			isWindow: isWindow,
			offset: withinElement.offset() || { left: 0, top: 0 },
			scrollLeft: withinElement.scrollLeft(),
			scrollTop: withinElement.scrollTop(),
			width: isWindow ? withinElement.width() : withinElement.outerWidth(),
			height: isWindow ? withinElement.height() : withinElement.outerHeight()
		};
	}
};

$.fn.position = function( options ) {
	if ( !options || !options.of ) {
		return _position.apply( this, arguments );
	}

	// make a copy, we don't want to modify arguments
	options = $.extend( {}, options );

	var atOffset, targetWidth, targetHeight, targetOffset, basePosition, dimensions,
		target = $( options.of ),
		within = $.position.getWithinInfo( options.within ),
		scrollInfo = $.position.getScrollInfo( within ),
		collision = ( options.collision || "flip" ).split( " " ),
		offsets = {};

	dimensions = getDimensions( target );
	if ( target[0].preventDefault ) {
		// force left top to allow flipping
		options.at = "left top";
	}
	targetWidth = dimensions.width;
	targetHeight = dimensions.height;
	targetOffset = dimensions.offset;
	// clone to reuse original targetOffset later
	basePosition = $.extend( {}, targetOffset );

	// force my and at to have valid horizontal and vertical positions
	// if a value is missing or invalid, it will be converted to center
	$.each( [ "my", "at" ], function() {
		var pos = ( options[ this ] || "" ).split( " " ),
			horizontalOffset,
			verticalOffset;

		if ( pos.length === 1) {
			pos = rhorizontal.test( pos[ 0 ] ) ?
				pos.concat( [ "center" ] ) :
				rvertical.test( pos[ 0 ] ) ?
					[ "center" ].concat( pos ) :
					[ "center", "center" ];
		}
		pos[ 0 ] = rhorizontal.test( pos[ 0 ] ) ? pos[ 0 ] : "center";
		pos[ 1 ] = rvertical.test( pos[ 1 ] ) ? pos[ 1 ] : "center";

		// calculate offsets
		horizontalOffset = roffset.exec( pos[ 0 ] );
		verticalOffset = roffset.exec( pos[ 1 ] );
		offsets[ this ] = [
			horizontalOffset ? horizontalOffset[ 0 ] : 0,
			verticalOffset ? verticalOffset[ 0 ] : 0
		];

		// reduce to just the positions without the offsets
		options[ this ] = [
			rposition.exec( pos[ 0 ] )[ 0 ],
			rposition.exec( pos[ 1 ] )[ 0 ]
		];
	});

	// normalize collision option
	if ( collision.length === 1 ) {
		collision[ 1 ] = collision[ 0 ];
	}

	if ( options.at[ 0 ] === "right" ) {
		basePosition.left += targetWidth;
	} else if ( options.at[ 0 ] === "center" ) {
		basePosition.left += targetWidth / 2;
	}

	if ( options.at[ 1 ] === "bottom" ) {
		basePosition.top += targetHeight;
	} else if ( options.at[ 1 ] === "center" ) {
		basePosition.top += targetHeight / 2;
	}

	atOffset = getOffsets( offsets.at, targetWidth, targetHeight );
	basePosition.left += atOffset[ 0 ];
	basePosition.top += atOffset[ 1 ];

	return this.each(function() {
		var collisionPosition, using,
			elem = $( this ),
			elemWidth = elem.outerWidth(),
			elemHeight = elem.outerHeight(),
			marginLeft = parseCss( this, "marginLeft" ),
			marginTop = parseCss( this, "marginTop" ),
			collisionWidth = elemWidth + marginLeft + parseCss( this, "marginRight" ) + scrollInfo.width,
			collisionHeight = elemHeight + marginTop + parseCss( this, "marginBottom" ) + scrollInfo.height,
			position = $.extend( {}, basePosition ),
			myOffset = getOffsets( offsets.my, elem.outerWidth(), elem.outerHeight() );

		if ( options.my[ 0 ] === "right" ) {
			position.left -= elemWidth;
		} else if ( options.my[ 0 ] === "center" ) {
			position.left -= elemWidth / 2;
		}

		if ( options.my[ 1 ] === "bottom" ) {
			position.top -= elemHeight;
		} else if ( options.my[ 1 ] === "center" ) {
			position.top -= elemHeight / 2;
		}

		position.left += myOffset[ 0 ];
		position.top += myOffset[ 1 ];

		// if the browser doesn't support fractions, then round for consistent results
		if ( !$.support.offsetFractions ) {
			position.left = round( position.left );
			position.top = round( position.top );
		}

		collisionPosition = {
			marginLeft: marginLeft,
			marginTop: marginTop
		};

		$.each( [ "left", "top" ], function( i, dir ) {
			if ( $.ui.position[ collision[ i ] ] ) {
				$.ui.position[ collision[ i ] ][ dir ]( position, {
					targetWidth: targetWidth,
					targetHeight: targetHeight,
					elemWidth: elemWidth,
					elemHeight: elemHeight,
					collisionPosition: collisionPosition,
					collisionWidth: collisionWidth,
					collisionHeight: collisionHeight,
					offset: [ atOffset[ 0 ] + myOffset[ 0 ], atOffset [ 1 ] + myOffset[ 1 ] ],
					my: options.my,
					at: options.at,
					within: within,
					elem : elem
				});
			}
		});

		if ( options.using ) {
			// adds feedback as second argument to using callback, if present
			using = function( props ) {
				var left = targetOffset.left - position.left,
					right = left + targetWidth - elemWidth,
					top = targetOffset.top - position.top,
					bottom = top + targetHeight - elemHeight,
					feedback = {
						target: {
							element: target,
							left: targetOffset.left,
							top: targetOffset.top,
							width: targetWidth,
							height: targetHeight
						},
						element: {
							element: elem,
							left: position.left,
							top: position.top,
							width: elemWidth,
							height: elemHeight
						},
						horizontal: right < 0 ? "left" : left > 0 ? "right" : "center",
						vertical: bottom < 0 ? "top" : top > 0 ? "bottom" : "middle"
					};
				if ( targetWidth < elemWidth && abs( left + right ) < targetWidth ) {
					feedback.horizontal = "center";
				}
				if ( targetHeight < elemHeight && abs( top + bottom ) < targetHeight ) {
					feedback.vertical = "middle";
				}
				if ( max( abs( left ), abs( right ) ) > max( abs( top ), abs( bottom ) ) ) {
					feedback.important = "horizontal";
				} else {
					feedback.important = "vertical";
				}
				options.using.call( this, props, feedback );
			};
		}

		elem.offset( $.extend( position, { using: using } ) );
	});
};

$.ui.position = {
	fit: {
		left: function( position, data ) {
			var within = data.within,
				withinOffset = within.isWindow ? within.scrollLeft : within.offset.left,
				outerWidth = within.width,
				collisionPosLeft = position.left - data.collisionPosition.marginLeft,
				overLeft = withinOffset - collisionPosLeft,
				overRight = collisionPosLeft + data.collisionWidth - outerWidth - withinOffset,
				newOverRight;

			// element is wider than within
			if ( data.collisionWidth > outerWidth ) {
				// element is initially over the left side of within
				if ( overLeft > 0 && overRight <= 0 ) {
					newOverRight = position.left + overLeft + data.collisionWidth - outerWidth - withinOffset;
					position.left += overLeft - newOverRight;
				// element is initially over right side of within
				} else if ( overRight > 0 && overLeft <= 0 ) {
					position.left = withinOffset;
				// element is initially over both left and right sides of within
				} else {
					if ( overLeft > overRight ) {
						position.left = withinOffset + outerWidth - data.collisionWidth;
					} else {
						position.left = withinOffset;
					}
				}
			// too far left -> align with left edge
			} else if ( overLeft > 0 ) {
				position.left += overLeft;
			// too far right -> align with right edge
			} else if ( overRight > 0 ) {
				position.left -= overRight;
			// adjust based on position and margin
			} else {
				position.left = max( position.left - collisionPosLeft, position.left );
			}
		},
		top: function( position, data ) {
			var within = data.within,
				withinOffset = within.isWindow ? within.scrollTop : within.offset.top,
				outerHeight = data.within.height,
				collisionPosTop = position.top - data.collisionPosition.marginTop,
				overTop = withinOffset - collisionPosTop,
				overBottom = collisionPosTop + data.collisionHeight - outerHeight - withinOffset,
				newOverBottom;

			// element is taller than within
			if ( data.collisionHeight > outerHeight ) {
				// element is initially over the top of within
				if ( overTop > 0 && overBottom <= 0 ) {
					newOverBottom = position.top + overTop + data.collisionHeight - outerHeight - withinOffset;
					position.top += overTop - newOverBottom;
				// element is initially over bottom of within
				} else if ( overBottom > 0 && overTop <= 0 ) {
					position.top = withinOffset;
				// element is initially over both top and bottom of within
				} else {
					if ( overTop > overBottom ) {
						position.top = withinOffset + outerHeight - data.collisionHeight;
					} else {
						position.top = withinOffset;
					}
				}
			// too far up -> align with top
			} else if ( overTop > 0 ) {
				position.top += overTop;
			// too far down -> align with bottom edge
			} else if ( overBottom > 0 ) {
				position.top -= overBottom;
			// adjust based on position and margin
			} else {
				position.top = max( position.top - collisionPosTop, position.top );
			}
		}
	},
	flip: {
		left: function( position, data ) {
			var within = data.within,
				withinOffset = within.offset.left + within.scrollLeft,
				outerWidth = within.width,
				offsetLeft = within.isWindow ? within.scrollLeft : within.offset.left,
				collisionPosLeft = position.left - data.collisionPosition.marginLeft,
				overLeft = collisionPosLeft - offsetLeft,
				overRight = collisionPosLeft + data.collisionWidth - outerWidth - offsetLeft,
				myOffset = data.my[ 0 ] === "left" ?
					-data.elemWidth :
					data.my[ 0 ] === "right" ?
						data.elemWidth :
						0,
				atOffset = data.at[ 0 ] === "left" ?
					data.targetWidth :
					data.at[ 0 ] === "right" ?
						-data.targetWidth :
						0,
				offset = -2 * data.offset[ 0 ],
				newOverRight,
				newOverLeft;

			if ( overLeft < 0 ) {
				newOverRight = position.left + myOffset + atOffset + offset + data.collisionWidth - outerWidth - withinOffset;
				if ( newOverRight < 0 || newOverRight < abs( overLeft ) ) {
					position.left += myOffset + atOffset + offset;
				}
			}
			else if ( overRight > 0 ) {
				newOverLeft = position.left - data.collisionPosition.marginLeft + myOffset + atOffset + offset - offsetLeft;
				if ( newOverLeft > 0 || abs( newOverLeft ) < overRight ) {
					position.left += myOffset + atOffset + offset;
				}
			}
		},
		top: function( position, data ) {
			var within = data.within,
				withinOffset = within.offset.top + within.scrollTop,
				outerHeight = within.height,
				offsetTop = within.isWindow ? within.scrollTop : within.offset.top,
				collisionPosTop = position.top - data.collisionPosition.marginTop,
				overTop = collisionPosTop - offsetTop,
				overBottom = collisionPosTop + data.collisionHeight - outerHeight - offsetTop,
				top = data.my[ 1 ] === "top",
				myOffset = top ?
					-data.elemHeight :
					data.my[ 1 ] === "bottom" ?
						data.elemHeight :
						0,
				atOffset = data.at[ 1 ] === "top" ?
					data.targetHeight :
					data.at[ 1 ] === "bottom" ?
						-data.targetHeight :
						0,
				offset = -2 * data.offset[ 1 ],
				newOverTop,
				newOverBottom;
			if ( overTop < 0 ) {
				newOverBottom = position.top + myOffset + atOffset + offset + data.collisionHeight - outerHeight - withinOffset;
				if ( ( position.top + myOffset + atOffset + offset) > overTop && ( newOverBottom < 0 || newOverBottom < abs( overTop ) ) ) {
					position.top += myOffset + atOffset + offset;
				}
			}
			else if ( overBottom > 0 ) {
				newOverTop = position.top -  data.collisionPosition.marginTop + myOffset + atOffset + offset - offsetTop;
				if ( ( position.top + myOffset + atOffset + offset) > overBottom && ( newOverTop > 0 || abs( newOverTop ) < overBottom ) ) {
					position.top += myOffset + atOffset + offset;
				}
			}
		}
	},
	flipfit: {
		left: function() {
			$.ui.position.flip.left.apply( this, arguments );
			$.ui.position.fit.left.apply( this, arguments );
		},
		top: function() {
			$.ui.position.flip.top.apply( this, arguments );
			$.ui.position.fit.top.apply( this, arguments );
		}
	}
};

// fraction support test
(function () {
	var testElement, testElementParent, testElementStyle, offsetLeft, i,
		body = document.getElementsByTagName( "body" )[ 0 ],
		div = document.createElement( "div" );

	//Create a "fake body" for testing based on method used in jQuery.support
	testElement = document.createElement( body ? "div" : "body" );
	testElementStyle = {
		visibility: "hidden",
		width: 0,
		height: 0,
		border: 0,
		margin: 0,
		background: "none"
	};
	if ( body ) {
		$.extend( testElementStyle, {
			position: "absolute",
			left: "-1000px",
			top: "-1000px"
		});
	}
	for ( i in testElementStyle ) {
		testElement.style[ i ] = testElementStyle[ i ];
	}
	testElement.appendChild( div );
	testElementParent = body || document.documentElement;
	testElementParent.insertBefore( testElement, testElementParent.firstChild );

	div.style.cssText = "position: absolute; left: 10.7432222px;";

	offsetLeft = $( div ).offset().left;
	$.support.offsetFractions = offsetLeft > 10 && offsetLeft < 11;

	testElement.innerHTML = "";
	testElementParent.removeChild( testElement );
})();

}( jQuery ) );

## rule-of-thirds.bookmarklet.js
function initMyBookmarklet() {
  (window.myBookmarklet = function() {

    // blow away customizations to underscore template parsing (eg 500px)
    _.templateSettings.interpolate = /<%=([\s\S]+?)%>/g
    _.templateSettings.evaluate = /<%([\s\S]+?)%>/g

    // TODO: simplify state handling on multiple-clicks of bookmarklet
    RuleOfThirds.stateMachine.advance();
  })();
}

// inspired by http://lamehacks.net/blog/implementing-a-state-machine-in-javascript/
RuleOfThirds = window.RuleOfThirds || {}
RuleOfThirds.stateMachine = RuleOfThirds.stateMachine || new (function (){
  states = [
    { name:'OFF',
      onEnter: function() {
        removeOverlays();
      }
    },
    { name:'GRID_THIRDS',
      onEnter: function() {
        removeOverlays(); // unnecessary due to order of state advance()
        createOverlays(function(width, height) { return getSVGOverlayThirdsGrid(width, height, "GRID_THIRDS")} );
      }
    },
    { name:'GRID_PHI',
      onEnter: function() {
        removeOverlays(); // unnecessary due to order of state advance()
        createOverlays(function(width, height) { return getSVGOverlayThirdsGrid(width, height, "GRID_PHI")} );
      }
    },
    { name:'TRIANGLES',
      onEnter: function() {
        removeOverlays(); // unnecessary due to order of state advance()
        createOverlays(function(width, height) { return getSVGOverlayThirdsGrid(width, height, "TRIANGLES")} );
      }
    },
    { name:'TRIANGLES_90',
      onEnter: function() {
        removeOverlays(); // unnecessary due to order of state advance()
        createOverlays(function(width, height) { return getSVGOverlayThirdsGrid(width, height, "TRIANGLES_90")} );
      }
    },
    { name:'SPIRAL_0',
      onEnter: function() {
        removeOverlays();
        createOverlays(function(width,height,degrees) { return getSVGOverlaySpiral(width, height, "SPIRAL_0"); });
      }
    },
    { name:'SPIRAL_90',
      onEnter: function() {
        removeOverlays();
        createOverlays(function(width,height,degrees) { return getSVGOverlaySpiral(width, height, "SPIRAL_90"); });
      }
    },
    { name:'SPIRAL_180',
      onEnter: function() {
        removeOverlays();
        createOverlays(function(width,height,degrees) { return getSVGOverlaySpiral(width, height, "SPIRAL_180"); });
      }
    },
    { name:'SPIRAL_270',
      onEnter: function() {
        removeOverlays();
        createOverlays(function(width,height,degrees) { return getSVGOverlaySpiral(width, height, "SPIRAL_270"); });
      }
    }
  ];

  this.currentState = states[0];
  this.advance = function(){
    this.currentState = states[(states.indexOf(this.currentState) + 1) % states.length];
    this.currentState.onEnter();
  }
})();

/*
 * Removes RuleOfThirds overlays.
 */
function removeOverlays() {
    if (jQuery('.rule-of-thirds').remove().length) {
      jQuery('.rule-of-thirds-wrapper > img').unwrap();
    }
}

function createOverlays(overlayFactory) {
  jQuery('img').each(function(){
    window.el = jQuery(this);
    var el = jQuery(this),
        w = el.width(),
        h = el.height(),
        src = el.attr('src') || "",
        useWrapper = (el.siblings().length == 0) && (el.offsetParent().width() == w)

    //skip small or invisible images
    if (!el.is(':visible') || w < 100 || h < 100) {
      return;
    }

    window.overlay = jQuery('<div />')
      .addClass('rule-of-thirds')
      .css( {
         'position': 'absolute',
         'pointer-events':'none',
         'width': w,
         'height': h,
       })
      .attr('rel',src || "" ) // "undefined" chokes .attr; http://bit.ly/134P0C9
      .append(overlayFactory(w,h))
      // .append(getCanvasOverlay(w,h))

    if (useWrapper) { // should be fairly harmless; fixes pinterest zoom
      var wrapper = jQuery('<div />')
        .addClass('rule-of-thirds-wrapper')
        .css({
          'position':'relative',
          'display' : 'inline-block', //fixes super-long pins eg http://pinterest.com/pin/552113235537700759/
          'text-align' : 'center',
        })
        .appendTo(el.parent())
        .append(el)
        .append(overlay);

      overlay.css({
        'width' : '100%',
        'height' : '100%',
        'top': '0px',
        'left': '0px',
      });
    } else {
      overlay.insertAfter(el);
      //XXX: why does overlay.position need to be run twice on http://bl.ocks.org/4331769
      // console.log("img offset", el.position());
      // console.log("overlay offset", overlay.position());
      overlay.position({"of": el, at: "center"});
      // console.log("overlay offset", overlay.position());
      overlay.position({"of": el, at: "center"});
      // console.log("overlay offset", overlay.position());
    }
  });
}


//from http://en.wikipedia.org/wiki/File:Fibonacci_spiral.svg
// according to lightroom this is the vertical orientation.
// for horizontal images, need to rotate 90 degrees CW
function getSVGOverlaySpiralTemplate() {
  var svg = '<svg\
   xmlns:dc="http://purl.org/dc/elements/1.1/"\
   xmlns:xlink="http://www.w3.org/1999/xlink"\
   xmlns:cc="http://web.resource.org/cc/"\
   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"\
   xmlns:svg="http://www.w3.org/2000/svg"\
   xmlns="http://www.w3.org/2000/svg"\
   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"\
   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"\
   id="svg2"\
   sodipodi:version="0.32"\
   inkscape:version="0.44"\
   version="1.0"\
   viewbox="<%= viewbox %>"\
   preserveAspectRatio="none"\
   sodipodi:docname="Fibonacci_spiral.svg">\
<defs>\
<g id="spiral" >\
  <path id="path1873" sodipodi:type="arc"\
     vector-effect="non-scaling-stroke"\
     sodipodi:cx="337.94031" sodipodi:cy="2354.0146" sodipodi:rx="301.58487" sodipodi:ry="281.75464"\
     d="M 36.355438,2354.0146 A 301.58487,281.75464 0 0 1 337.94031,2072.26"\
     sodipodi:start="3.1415927" sodipodi:end="4.712389" sodipodi:open="true"\
     transform="matrix(2.022351,0,0,2.164687,-73.02346,-4485.255)"\
     vector-effect="non-scaling-stroke" />\
  <path id="path1875" sodipodi:type="arc"\
     transform="matrix(-1.247009,0,0,1.334775,1031.657,-2765.459)"\
     sodipodi:open="true" sodipodi:end="4.712389" sodipodi:start="3.1415927"\
     d="M 36.355438,2354.0146 A 301.58487,281.75464 0 0 1 337.94031,2072.26"\
     vector-effect="non-scaling-stroke"\
     sodipodi:ry="281.75464" sodipodi:rx="301.58487" sodipodi:cy="2354.0146" sodipodi:cx="337.94031"\
     vector-effect="non-scaling-stroke" />\
  <path id="path2762" sodipodi:type="arc"\
     sodipodi:cx="337.94031" sodipodi:cy="2354.0146" sodipodi:rx="301.58487" sodipodi:ry="281.75464"\
     d="M 36.355438,2354.0146 A 301.58487,281.75464 0 0 1 337.94031,2072.26"\
     sodipodi:start="3.1415927" sodipodi:end="4.712389" sodipodi:open="true"\
     transform="matrix(0,-0.770297,-0.824511,0,2694.923,636.9008)"\
     vector-effect="non-scaling-stroke" />\
  <path id="path2764" sodipodi:type="arc"\
     transform="matrix(0.473354,0,0,-0.50667,594.0855,1658.848)"\
     sodipodi:open="true" sodipodi:end="4.712389" sodipodi:start="3.1415927"\
     d="M 36.355438,2354.0146 A 301.58487,281.75464 0 0 1 337.94031,2072.26"\
     sodipodi:ry="281.75464" sodipodi:rx="301.58487" sodipodi:cy="2354.0146" sodipodi:cx="337.94031"\
     vector-effect="non-scaling-stroke" />\
  <path id="path2766" sodipodi:type="arc"\
     sodipodi:cx="337.94031" sodipodi:cy="2354.0146" sodipodi:rx="301.58487" sodipodi:ry="281.75464"\
     d="M 36.355438,2354.0146 A 301.58487,281.75464 0 0 1 337.94031,2072.26"\
     sodipodi:start="3.1415927" sodipodi:end="4.712389" sodipodi:open="true"\
     transform="matrix(0.290281,0,0,0.310712,600.7412,-265.2473)"\
     vector-effect="non-scaling-stroke" />\
  <path id="path2768" sodipodi:type="arc"\
     transform="matrix(-0.181793,0,0,0.194589,760.2218,-24.60904)"\
     sodipodi:open="true" sodipodi:end="4.712389" sodipodi:start="3.1415927"\
     d="M 36.355438,2354.0146 A 301.58487,281.75464 0 0 1 337.94031,2072.26"\
     sodipodi:ry="281.75464" sodipodi:rx="301.58487" sodipodi:cy="2354.0146" sodipodi:cx="337.94031"\
     vector-effect="non-scaling-stroke" />\
  <path id="path2770" sodipodi:type="arc"\
     sodipodi:cx="337.94031" sodipodi:cy="2354.0146" sodipodi:rx="301.58487" sodipodi:ry="281.75464"\
     d="M 36.355438,2354.0146 A 301.58487,281.75464 0 0 1 337.94031,2072.26"\
     sodipodi:start="3.1415927" sodipodi:end="4.712389" sodipodi:open="true"\
     transform="matrix(-0.109629,0,0,-0.117346,757.5983,709.0538)"\
     vector-effect="non-scaling-stroke" />\
  <path id="path2772" sodipodi:type="arc"\
     transform="matrix(6.725143e-2,0,0,-7.198541e-2,697.9484,615.0548)"\
     sodipodi:open="true" sodipodi:end="4.712389" sodipodi:start="3.1415927"\
     d="M 36.355438,2354.0146 A 301.58487,281.75464 0 0 1 337.94031,2072.26"\
     sodipodi:ry="281.75464" sodipodi:rx="301.58487" sodipodi:cy="2354.0146" sodipodi:cx="337.94031"\
     vector-effect="non-scaling-stroke"\ />\
</g>\
<g id="rectangles">\
  <path d="M 754.24901,466.52217 L 610.30258,466.52217" id="rect2800" sodipodi:nodetypes="cc" vector-effect="non-scaling-stroke" />\
  <path d="M 754.24901,377.48564 L 754.24901,610.4945" id="rect2802" sodipodi:nodetypes="cc" vector-effect="non-scaling-stroke" />\
  <path d="M 610.30252,377.48564 L 987.15967,377.48564" id="rect2804" sodipodi:nodetypes="cc" vector-effect="non-scaling-stroke" />\
  <path d="M 610.30252,610.49292 L 610.30252,0.50000006" id="rect2806" sodipodi:nodetypes="cc" vector-effect="non-scaling-stroke" />\
</g>\
</defs>\
<% _.each(transform, function(t) { %>\
  <g id="drawing" transform="<%= t %>">\
<% }); %>\
<use xlink:href="#rectangles" style="vector-effect:none; stroke: grey; stroke-width: 4;"/>\
<use xlink:href="#rectangles" style="vector-effect:none; stroke: white; stroke-width: 2;"/>\
<use xlink:href="#spiral" style="fill:none; stroke: grey; stroke-width: 4;" />\
<use xlink:href="#spiral" style="fill:none; stroke: white; stroke-width: 2;" />\
<% _.each(transform, function(t) { %>\
</g>\
<% }); %>\
</svg>';
  return svg;
}

function getSVGOverlaySpiral(width, height, type) {

  //corresponds to values hardcoded in SVG template
  var viewboxWidth = 987.6,
      viewboxHeight = 611,
      viewbox = [0, 0, viewboxWidth, viewboxHeight].join(','),
      // rotation
      needsRotation = (width < height),
      viewboxCenterX = viewboxWidth / 2,
      viewboxCenterY = viewboxHeight / 2,
      rotationTransform = 'rotate(' + [90, viewboxCenterX, viewboxCenterY].join(",") + ')',
      // after rotating around (W/2,H/2), recenter around (H/2,W/2)
      translateX = viewboxCenterY - viewboxCenterX,
      translateY = viewboxCenterX - viewboxCenterY;
      translationTransform = 'translate(' + translateX + ',' + translateY + ')';

  // from http://tech.groups.yahoo.com/group/svg-developers/message/14903
  var transformations = [];

  if (needsRotation) {
      // Note: SVG transformation order is important and counter-intuitive
      transformations.push(translationTransform, rotationTransform);
      viewbox = [0, 0, viewboxHeight, viewboxWidth].join(',');
  }

  switch (type) {
    case "SPIRAL_90":
      var transform = 'matrix(-1,0,0,1,' + viewboxWidth +',0)'; //horizontal flip
      // var transform = 'rotate(90 494 306)';
      break;
    case "SPIRAL_180":
      var transform = 'matrix(-1,0,0,-1,' + viewboxWidth +',' + viewboxHeight + ')'; // vertical + horizontal flip
      break;
    case "SPIRAL_270":
      var transform = '';
      var transform = 'matrix(1,0,0,-1,0,' + viewboxHeight + ')'; //horizontal flip
      break;
    case "SPIRAL_0":
    default:
      var transform = '';
  }

  if (transform) {
    transformations.push(transform);
  }

  var svg = _.template(getSVGOverlaySpiralTemplate(), {
    transform: transformations,
    viewbox: viewbox
  });

  // because firefox seems to need this; see /tests/svg-viewbox.html
  svg = jQuery(svg).css({
    width: '100%',
    height: '100%'
  });
  return svg;
}


function getSVGOverlayThirdsGridTemplate() {
  // multiline strings in JS require trailing backslashes
  // including the <?xml tag causes errors, so we remove it
  // var svg = '<?xml version="1.0" standalone="no"?><!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">\
  var svg = '<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">\
<svg xmlns="http://www.w3.org/2000/svg" version="1.1" viewbox="<%= viewbox %>" preserveAspectRatio="none">\
<% _.each(lines, function(line) { %>\
<polyline points="<%= line %>" style="stroke: grey; stroke-width:4;" vector-effect="non-scaling-stroke" />\
<polyline points="<%= line %>" style="stroke: white; stroke-width:2;" vector-effect="non-scaling-stroke" />\
<% }); %>\
</svg>';
  return svg;
}

function getSVGOverlayThirdsGrid(width, height, type) {

  /*   |  |
     --+--+-- h1
       |  |
     --+--+-- h2
       |  |
      v1  v2   */


  switch (type) {
    case "TRIANGLES":
      var w = width, h = height, w_sq = Math.pow(w,2), h_sq = Math.pow(h,2);
      var lines = {
        d1: [0, 0, (h_sq * w)/(w_sq + h_sq), h * w_sq / (w_sq + h_sq)],
        d2: [w - (h_sq * w)/(w_sq + h_sq), h - h * w_sq / (w_sq + h_sq), w, h],
        d3: [0, h, w, 0],
      };
      break;
    case "TRIANGLES_90":
      var w = width, h = height, w_sq = Math.pow(w,2), h_sq = Math.pow(h,2);
        // vertical axis mirror from TRIANGLES
      var lines = {
        d1: [w, 0, w - (h_sq * w)/(w_sq + h_sq), h * w_sq / (w_sq + h_sq)],
        d2: [(h_sq * w)/(w_sq + h_sq), h - h * w_sq / (w_sq + h_sq), 0, h],
        d3: [0,0,w,h]
      };
      break;
    case "GRID_PHI":
      var phi = 1.6180339887;
      var v1 = width * (1-(1/phi)),
          v2 = width * (1/phi),
          h1 = height * (1-(1/phi)),
          h2 = height * (1/phi);
      var lines = {
        h1: [0, h1, width, h1],
        h2: [0, h2, width, h2],
        v1: [v1, 0, v1, height],
        v2: [v2, 0, v2, height]
      };
      break;
    case "GRID_THIRDS":
    default:
      var v1 = width * (1/3),
          v2 = width * (2/3),
          h1 = height * (1/3),
          h2 = height * (2/3);
      var lines = {
        h1: [0, h1, width, h1],
        h2: [0, h2, width, h2],
        v1: [v1, 0, v1, height],
        v2: [v2, 0, v2, height]
      };
  }


  // inspired by https://github.com/documentcloud/underscore/issues/220
  function objectMapPreserveKeys(obj,map) {
    return _.reduce(obj, function(memo,v,k) { memo[k] = map(v); return memo; }, {});
  }

  var svg = _.template(getSVGOverlayThirdsGridTemplate(), {
    viewbox: [0,0,width,height].join(" "),
    lines: _.map(lines, function(v) { return v[0] + "," + v[1] + " " + v[2] + "," + v[3]; })
  });

  return jQuery(svg);
}


function getCanvasOverlay(width,height){
  var canvas = jQuery('<canvas />')
    .attr({
      'width':width,
      'height':height
    });

  var ctx = canvas[0].getContext('2d');

  var drawLine = function(line,strokeStyle,lineWidth) {
    var x1 = line[0],
        y1 = line[1],
        x2 = line[2],
        y2 = line[3];
    ctx.beginPath();
    ctx.strokeStyle = strokeStyle;
    ctx.lineWidth = lineWidth;
    ctx.moveTo(x1,y1);
    ctx.lineTo(x2,y2);
    ctx.stroke();
  }

  function drawLines(lines,color,size) {
    lines.forEach(function(line) {
      drawLine(line,color,size);
    });
  }

  /*   |  |
     --+--+-- h1
       |  |
     --+--+-- h2
       |  |
      v1  v2   */

  var h1 = [0, height/3, width, height/3],
      h2 = [0, 2*height/3, width, 2*height/3],
      v1 = [width/3, 0, width/3, height],
      v2 = [2*width/3, 0, 2*width/3, height];

  var lines = [h1,h2,v1,v2];

  drawLines(lines,'white',12);
  drawLines(lines,'black',4);

  return canvas;
}

(function(){
		var done = false;
		var script = document.createElement("script");
		script.src = "//cdnjs.cloudflare.com/ajax/libs/yepnope/1.5.4/yepnope.min.js";
		script.onload = script.onreadystatechange = function(){
			if (!done && (!this.readyState || this.readyState == "loaded" || this.readyState == "complete")) {
				done = true;
				requireDeps();
			}
		};
		document.getElementsByTagName("head")[0].appendChild(script);
})();

function requireDeps() {
  function isUndefined(val) {
    return typeof(val) === "undefined";
  }

  var needJq = isUndefined(window.jQuery) || jQuery.fn.jquery.match(/^1\.[0-9]+/) <= 1.4,
      needJqUiPosition = isUndefined(window.jQuery) || isUndefined(jQuery.ui) || isUndefined(jQuery.ui.position),
      needUnderscore = isUndefined(window._) || isUndefined(_.template);

  yepnope([{
      test: needJq,
      yep: '//cdnjs.cloudflare.com/ajax/libs/jquery/1.4.4/jquery.min.js',
    }, {
      // check for jQuery.ui.position
      test: needJqUiPosition,
      yep: 'https://gist.github.com/raw/4331769/dbfadedd1691b5e5fa006062682bab14390bec52/jquery.ui.position.js'
    }, {
      // check for jQuery.ui.position
      test: needUnderscore,
      yep: '//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.3/underscore-min.js',
      complete: function (url, result, key) {
        initMyBookmarklet();
        // TODO: makes our jQuery version not clobber pre-existing one (eg for pinterest)
        // jQuery.noConflict(true) doesn't seem to work properly
      }
    }
  ]);

}


## rule-of-thirds.css
div.imgWrapper.enabled {
  position: relative;
  display: inline-block;
}
div.imgWrapper.enabled:before {
  background:url("https://gist.github.com/raw/4331769/rule-of-thirds.png");
  background-size: 100% 100%;
  background-repeat:no-repeat;
  width:100%;
  height: 100%;
  z-index: 1;
  top:0;
  left:0;
  position: absolute;
  content: " ";
}
div.imgWrapper.enabled>img {
filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale"); /* Firefox 10+, Firefox on Android */
-webkit-filter: grayscale(100%);
-moz-filter: grayscale(100%);
-ms-filter: grayscale(100%);
-o-filter: grayscale(100%);
filter: grayscale(100%);
}

## rule-of-thirds.png

      
    Raw
  

              rule-of-thirds.png
            
          
## rule-of-thirds.svg

      
Display the source blob

    
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              rule-of-thirds.svg
            
          
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## screenshot.gif

      
    Raw
  

              screenshot.gif
            
          
## spiral-portrait.html
<h1> Spiral on Vertical Image </h1>

<img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f9/Mona_Lisa%2C_by_Leonardo_da_Vinci%2C_from_C2RMF_natural_color.jpg/401px-Mona_Lisa%2C_by_Leonardo_da_Vinci%2C_from_C2RMF_natural_color.jpg" width="401" height="599">

<script type="text/javascript" src="/rule-of-thirds.bookmarklet.js"></script>
<script type="text/javascript">
  //overrides standard behavior
function initMyBookmarklet() {
  createOverlays(function(width,height,degrees) {
    return getSVGOverlaySpiral(width, height, "SPIRAL_270");
  });
}
</script>

<style>
  svg {
    border: 2px solid green;
  }
  div {
    border: 2px solid blue;
  }
</style>


## svg-viewbox-rotate.html
<h1> SVG viewbox rotation </h1>

This demonstrates what it takes to achieve rotating the svg. Note that the red lines are originally horizontal.
Pay attention to the following:

<li> rotate(90,CX,CY)
<li> translate(CY-CX, CX-CY)
<li> there's width on the wrapper, which is post-rotation stretched via viewbox="0,0,H,W", preserveAspectRatio=none
<li> viewbox="0,0,H,W" instead of "0,0,W,H"

<h2> Resources </h2>

<li> http://en.wikipedia.org/wiki/Matrix_multiplication
<li> http://www.w3.org/TR/SVGTiny12/coords.html#NestedTransformations
<li> http://commons.oreilly.com/wiki/index.php/SVG_Essentials/Transforming_the_Coordinate_System
<li> http://webdesign.about.com/od/svg/a/svg-viewbox-attribute.htm


<div id="wrapper">
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
viewboxOriginal="0,0,300,600"
viewbox="0,0,300,600"
preserveAspectRatio="none"
version="1.1">
  <defs>
    <g id="horizontal-lines">
      <polyline vector-effect="non-scaling-stroke" points="0,100 600,100" />
      <polyline vector-effect="non-scaling-stroke" points="0,200 600,200" />
    </g>
    <g id="vertical-lines">
    <polyline vector-effect="non-scaling-stroke" points="200,0 200,300" />
    <polyline vector-effect="non-scaling-stroke" points="400,0 400,300" />
    </g>
  </defs>
  <g transform="translate(-150,150)">
    <g transform="rotate(90,300,150)">
      <use xlink:href="#horizontal-lines" style="stroke: red; stroke-width: 2"/>
      <use xlink:href="#vertical-lines" style="stroke: black; stroke-width: 2"/>
    </g>
  </g>
</svg>
</div>

<style>
  svg {
    border: 2px solid green;
  }
  div#wrapper {
    border: 2px solid blue;
    width: 450px;
    height: 900px;
  }
</style>


## svg-viewbox.html
<h1> SVG viewbox </h1>

<p>This demonstrates that an embedded SVG is sized differently in chrome and firefox.
It seems that firefox just ignores preserveAspectRatio.

<p>The following CSS demonstrates a workaround: <pre>svg:hover { width:100%; height: 100%}</pre>

<div id="wrapper">
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
viewbox="0,0,600,300"
preserveAspectRatio="none"
version="1.1">
  <defs>
    <g id="horizontal-lines">
      <polyline vector-effect="non-scaling-stroke" points="0,100 600,100" />
      <polyline vector-effect="non-scaling-stroke" points="0,200 600,200" />
    </g>
    <g id="vertical-lines">
    <polyline vector-effect="non-scaling-stroke" points="200,0 200,300" />
    <polyline vector-effect="non-scaling-stroke" points="400,0 400,300" />
    </g>
  </defs>
  <use xlink:href="#horizontal-lines" style="stroke: red; stroke-width: 2"/>
  <use xlink:href="#vertical-lines" style="stroke: black; stroke-width: 2"/>
</svg>
</div>

<style>
  svg {
    border: 2px solid green;
  }
  svg:hover {
    width: 100%;
    height: 100%;
  }
  div#wrapper {
    border: 2px solid blue;
    width: 150px;
    height: 300px;
  }
</style>

<h2> Resources </h2>

<li> http://webdesign.about.com/od/svg/a/svg-viewbox-attribute.htm
<li> https://bugzilla.mozilla.org/show_bug.cgi?id=777265
<li> http://jsfiddle.net/gonsfx/Rm2LE/ "Firefox PreserveAspectRatio BUG"
<li> http://stackoverflow.com/questions/644896/how-do-i-scale-a-stubborn-svg-embedded-with-the-object-tag
<li> http://stackoverflow.com/questions/10524978/html5-svg-preserveaspectratio-none-not-working-in-firefox
	<html>
	<title>rule-of-thirds.js bookmarklet</title>
	<head>
	<style type="text/css">
	.button-wrapper {
	margin: 2em 0;
	}
	.inline-button,
	.button {
	/* base64 encoder: http://www.greywyvern.com/code/php/binary2base64 */
	/* Source image: http://tiny.cc/public/images/default-favicon.ico */
	background-image: url(data:image/vnd.microsoft.icon;base64,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);
	background-repeat: no-repeat;
	background-color: #65a9d7;
	background-position: 10px center;
	padding: 10px 20px 10px 32px;
	border-radius: 8px;
	color: white;
	font-size: 18px;
	font-family: 'Lucida Grande', Helvetica, Arial, Sans-Serif;
	text-decoration: none;
	}
	.inline-button {
	display: inline;
	background-color: transparent;
	padding-right: 3px;
	padding-left: 28px;
	font-size: 1em;
	background-size: 13px 13px;
	}
	.inline-button a {
	text-decoration: none;
	color: #65a9d7;
	}
	body {
	padding: 20px;
	font-family: Helvetica, Arial, sans-serif;
	font-size: .9em;
	color: #444;
	}
	p {
	line-height: 1.5em;
	margin: .5em 0 1em 0;
	}
	ul {
	line-height: 2em;
	list-style-type: none;
	padding-left: 1em;
	}
	</style>
	</head>
	<body>
	<section data-markdown>

	To install the bookmarklet, [drag it to your bookmark toolbar](http://dl-web.dropbox.com/u/29440342/screenshots/HEILHU-2013.1.2-18.52.png), after which you can run it on any webpage with interesting images.

	<div class="button-wrapper"><a class="button" href="javascript:(function(){var s = document.createElement('script');s.src = 'https://gist.github.com/raw/4331769/cdffe1f17ccda7eeadd1a732753ce067aba4147f/rule-of-thirds.bookmarklet.js';document.body.appendChild(s);})();">RuleOfThirds</a></div>

	The above is the January 2, 2012 release of rule-of-thirds.bookmarklet.js. For
	development purposes, I've also created the following variants of the
	bookmarklet. Since the dated release is more stable and secure, only use these
	if you know what you're doing.

	* <div class="inline-button"><a href="javascript:(function(){var s = document.createElement('script');s.src='https://gist.github.com/raw/4331769/rule-of-thirds.bookmarklet.js';document.body.appendChild(s);})();">RuleOfThirds-HEAD</a></div>
	https://gist.github.com/raw/4331769/rule-of-thirds.bookmarklet.js
	* <div class="inline-button"><a href="javascript:(function(){var s = document.createElement('script');s.src='http://localhost:9090/rule-of-thirds.bookmarklet.js?time'+(new Date().getTime());document.body.appendChild(s);})();">RuleOfThirds-localhost</a></div>
	http://localhost:9090/rule-of-thirds.bookmarklet.js?time=12345678

	Feel free to try out the bookmarklet with some famous photographs:

	<a data-pin-do="embedBoard" href="http://pinterest.com/dergachev/beyond-rule-of-thirds-lecture/"></a>
	</section>

	<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
	<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/showdown/0.3.1/showdown.min.js"></script>
	<script>
	// adapted from http://blog.harakys.com/blog/2012/02/21/embed-markdown-into-your-html/
	// see also https://gist.github.com/1343518
	[].forEach.call( document.querySelectorAll('[data-markdown]'), function fn(elem){
	var html = (new Showdown.converter()).makeHtml(elem.innerHTML);
	elem.innerHTML = html;
	});
	</script>
	<script type="text/javascript" src="http://assets.pinterest.com/js/pinit.js" ></script>
	</body>
	</html>
	/*!
	* jQuery UI Position @VERSION
	* http://jqueryui.com
	*
	* Copyright 2012 jQuery Foundation and other contributors
	* Released under the MIT license.
	* http://jquery.org/license
	*
	* http://api.jqueryui.com/position/
	*/
	(function( $, undefined ) {

	$.ui = $.ui \|\| {};

	var cachedScrollbarWidth,
	max = Math.max,
	abs = Math.abs,
	round = Math.round,
	rhorizontal = /left\|center\|right/,
	rvertical = /top\|center\|bottom/,
	roffset = /[\+\-]\d+%?/,
	rposition = /^\w+/,
	rpercent = /%$/,
	_position = $.fn.position;

	function getOffsets( offsets, width, height ) {
	return [
	parseInt( offsets[ 0 ], 10 ) * ( rpercent.test( offsets[ 0 ] ) ? width / 100 : 1 ),
	parseInt( offsets[ 1 ], 10 ) * ( rpercent.test( offsets[ 1 ] ) ? height / 100 : 1 )
	];
	}

	function parseCss( element, property ) {
	return parseInt( $.css( element, property ), 10 ) \|\| 0;
	}

	function getDimensions( elem ) {
	var raw = elem[0];
	if ( raw.nodeType === 9 ) {
	return {
	width: elem.width(),
	height: elem.height(),
	offset: { top: 0, left: 0 }
	};
	}
	if ( $.isWindow( raw ) ) {
	return {
	width: elem.width(),
	height: elem.height(),
	offset: { top: elem.scrollTop(), left: elem.scrollLeft() }
	};
	}
	if ( raw.preventDefault ) {
	return {
	width: 0,
	height: 0,
	offset: { top: raw.pageY, left: raw.pageX }
	};
	}
	return {
	width: elem.outerWidth(),
	height: elem.outerHeight(),
	offset: elem.offset()
	};
	}

	$.position = {
	scrollbarWidth: function() {
	if ( cachedScrollbarWidth !== undefined ) {
	return cachedScrollbarWidth;
	}
	var w1, w2,
	div = $( "<div style='display:block;width:50px;height:50px;overflow:hidden;'><div style='height:100px;width:auto;'></div></div>" ),
	innerDiv = div.children()[0];

	$( "body" ).append( div );
	w1 = innerDiv.offsetWidth;
	div.css( "overflow", "scroll" );

	w2 = innerDiv.offsetWidth;

	if ( w1 === w2 ) {
	w2 = div[0].clientWidth;
	}

	div.remove();

	return (cachedScrollbarWidth = w1 - w2);
	},
	getScrollInfo: function( within ) {
	var overflowX = within.isWindow ? "" : within.element.css( "overflow-x" ),
	overflowY = within.isWindow ? "" : within.element.css( "overflow-y" ),
	hasOverflowX = overflowX === "scroll" \|\|
	( overflowX === "auto" && within.width < within.element[0].scrollWidth ),
	hasOverflowY = overflowY === "scroll" \|\|
	( overflowY === "auto" && within.height < within.element[0].scrollHeight );
	return {
	width: hasOverflowX ? $.position.scrollbarWidth() : 0,
	height: hasOverflowY ? $.position.scrollbarWidth() : 0
	};
	},
	getWithinInfo: function( element ) {
	var withinElement = $( element \|\| window ),
	isWindow = $.isWindow( withinElement[0] );
	return {
	element: withinElement,
	isWindow: isWindow,
	offset: withinElement.offset() \|\| { left: 0, top: 0 },
	scrollLeft: withinElement.scrollLeft(),
	scrollTop: withinElement.scrollTop(),
	width: isWindow ? withinElement.width() : withinElement.outerWidth(),
	height: isWindow ? withinElement.height() : withinElement.outerHeight()
	};
	}
	};

	$.fn.position = function( options ) {
	if ( !options \|\| !options.of ) {
	return _position.apply( this, arguments );
	}

	// make a copy, we don't want to modify arguments
	options = $.extend( {}, options );

	var atOffset, targetWidth, targetHeight, targetOffset, basePosition, dimensions,
	target = $( options.of ),
	within = $.position.getWithinInfo( options.within ),
	scrollInfo = $.position.getScrollInfo( within ),
	collision = ( options.collision \|\| "flip" ).split( " " ),
	offsets = {};

	dimensions = getDimensions( target );
	if ( target[0].preventDefault ) {
	// force left top to allow flipping
	options.at = "left top";
	}
	targetWidth = dimensions.width;
	targetHeight = dimensions.height;
	targetOffset = dimensions.offset;
	// clone to reuse original targetOffset later
	basePosition = $.extend( {}, targetOffset );

	// force my and at to have valid horizontal and vertical positions
	// if a value is missing or invalid, it will be converted to center
	$.each( [ "my", "at" ], function() {
	var pos = ( options[ this ] \|\| "" ).split( " " ),
	horizontalOffset,
	verticalOffset;

	if ( pos.length === 1) {
	pos = rhorizontal.test( pos[ 0 ] ) ?
	pos.concat( [ "center" ] ) :
	rvertical.test( pos[ 0 ] ) ?
	[ "center" ].concat( pos ) :
	[ "center", "center" ];
	}
	pos[ 0 ] = rhorizontal.test( pos[ 0 ] ) ? pos[ 0 ] : "center";
	pos[ 1 ] = rvertical.test( pos[ 1 ] ) ? pos[ 1 ] : "center";

	// calculate offsets
	horizontalOffset = roffset.exec( pos[ 0 ] );
	verticalOffset = roffset.exec( pos[ 1 ] );
	offsets[ this ] = [
	horizontalOffset ? horizontalOffset[ 0 ] : 0,
	verticalOffset ? verticalOffset[ 0 ] : 0
	];

	// reduce to just the positions without the offsets
	options[ this ] = [
	rposition.exec( pos[ 0 ] )[ 0 ],
	rposition.exec( pos[ 1 ] )[ 0 ]
	];
	});

	// normalize collision option
	if ( collision.length === 1 ) {
	collision[ 1 ] = collision[ 0 ];
	}

	if ( options.at[ 0 ] === "right" ) {
	basePosition.left += targetWidth;
	} else if ( options.at[ 0 ] === "center" ) {
	basePosition.left += targetWidth / 2;
	}

	if ( options.at[ 1 ] === "bottom" ) {
	basePosition.top += targetHeight;
	} else if ( options.at[ 1 ] === "center" ) {
	basePosition.top += targetHeight / 2;
	}

	atOffset = getOffsets( offsets.at, targetWidth, targetHeight );
	basePosition.left += atOffset[ 0 ];
	basePosition.top += atOffset[ 1 ];

	return this.each(function() {
	var collisionPosition, using,
	elem = $( this ),
	elemWidth = elem.outerWidth(),
	elemHeight = elem.outerHeight(),
	marginLeft = parseCss( this, "marginLeft" ),
	marginTop = parseCss( this, "marginTop" ),
	collisionWidth = elemWidth + marginLeft + parseCss( this, "marginRight" ) + scrollInfo.width,
	collisionHeight = elemHeight + marginTop + parseCss( this, "marginBottom" ) + scrollInfo.height,
	position = $.extend( {}, basePosition ),
	myOffset = getOffsets( offsets.my, elem.outerWidth(), elem.outerHeight() );

	if ( options.my[ 0 ] === "right" ) {
	position.left -= elemWidth;
	} else if ( options.my[ 0 ] === "center" ) {
	position.left -= elemWidth / 2;
	}

	if ( options.my[ 1 ] === "bottom" ) {
	position.top -= elemHeight;
	} else if ( options.my[ 1 ] === "center" ) {
	position.top -= elemHeight / 2;
	}

	position.left += myOffset[ 0 ];
	position.top += myOffset[ 1 ];

	// if the browser doesn't support fractions, then round for consistent results
	if ( !$.support.offsetFractions ) {
	position.left = round( position.left );
	position.top = round( position.top );
	}

	collisionPosition = {
	marginLeft: marginLeft,
	marginTop: marginTop
	};

	$.each( [ "left", "top" ], function( i, dir ) {
	if ( $.ui.position[ collision[ i ] ] ) {
	$.ui.position[ collision[ i ] ][ dir ]( position, {
	targetWidth: targetWidth,
	targetHeight: targetHeight,
	elemWidth: elemWidth,
	elemHeight: elemHeight,
	collisionPosition: collisionPosition,
	collisionWidth: collisionWidth,
	collisionHeight: collisionHeight,
	offset: [ atOffset[ 0 ] + myOffset[ 0 ], atOffset [ 1 ] + myOffset[ 1 ] ],
	my: options.my,
	at: options.at,
	within: within,
	elem : elem
	});
	}
	});

	if ( options.using ) {
	// adds feedback as second argument to using callback, if present
	using = function( props ) {
	var left = targetOffset.left - position.left,
	right = left + targetWidth - elemWidth,
	top = targetOffset.top - position.top,
	bottom = top + targetHeight - elemHeight,
	feedback = {
	target: {
	element: target,
	left: targetOffset.left,
	top: targetOffset.top,
	width: targetWidth,
	height: targetHeight
	},
	element: {
	element: elem,
	left: position.left,
	top: position.top,
	width: elemWidth,
	height: elemHeight
	},
	horizontal: right < 0 ? "left" : left > 0 ? "right" : "center",
	vertical: bottom < 0 ? "top" : top > 0 ? "bottom" : "middle"
	};
	if ( targetWidth < elemWidth && abs( left + right ) < targetWidth ) {
	feedback.horizontal = "center";
	}
	if ( targetHeight < elemHeight && abs( top + bottom ) < targetHeight ) {
	feedback.vertical = "middle";
	}
	if ( max( abs( left ), abs( right ) ) > max( abs( top ), abs( bottom ) ) ) {
	feedback.important = "horizontal";
	} else {
	feedback.important = "vertical";
	}
	options.using.call( this, props, feedback );
	};
	}

	elem.offset( $.extend( position, { using: using } ) );
	});
	};

	$.ui.position = {
	fit: {
	left: function( position, data ) {
	var within = data.within,
	withinOffset = within.isWindow ? within.scrollLeft : within.offset.left,
	outerWidth = within.width,
	collisionPosLeft = position.left - data.collisionPosition.marginLeft,
	overLeft = withinOffset - collisionPosLeft,
	overRight = collisionPosLeft + data.collisionWidth - outerWidth - withinOffset,
	newOverRight;

	// element is wider than within
	if ( data.collisionWidth > outerWidth ) {
	// element is initially over the left side of within
	if ( overLeft > 0 && overRight <= 0 ) {
	newOverRight = position.left + overLeft + data.collisionWidth - outerWidth - withinOffset;
	position.left += overLeft - newOverRight;
	// element is initially over right side of within
	} else if ( overRight > 0 && overLeft <= 0 ) {
	position.left = withinOffset;
	// element is initially over both left and right sides of within
	} else {
	if ( overLeft > overRight ) {
	position.left = withinOffset + outerWidth - data.collisionWidth;
	} else {
	position.left = withinOffset;
	}
	}
	// too far left -> align with left edge
	} else if ( overLeft > 0 ) {
	position.left += overLeft;
	// too far right -> align with right edge
	} else if ( overRight > 0 ) {
	position.left -= overRight;
	// adjust based on position and margin
	} else {
	position.left = max( position.left - collisionPosLeft, position.left );
	}
	},
	top: function( position, data ) {
	var within = data.within,
	withinOffset = within.isWindow ? within.scrollTop : within.offset.top,
	outerHeight = data.within.height,
	collisionPosTop = position.top - data.collisionPosition.marginTop,
	overTop = withinOffset - collisionPosTop,
	overBottom = collisionPosTop + data.collisionHeight - outerHeight - withinOffset,
	newOverBottom;

	// element is taller than within
	if ( data.collisionHeight > outerHeight ) {
	// element is initially over the top of within
	if ( overTop > 0 && overBottom <= 0 ) {
	newOverBottom = position.top + overTop + data.collisionHeight - outerHeight - withinOffset;
	position.top += overTop - newOverBottom;
	// element is initially over bottom of within
	} else if ( overBottom > 0 && overTop <= 0 ) {
	position.top = withinOffset;
	// element is initially over both top and bottom of within
	} else {
	if ( overTop > overBottom ) {
	position.top = withinOffset + outerHeight - data.collisionHeight;
	} else {
	position.top = withinOffset;
	}
	}
	// too far up -> align with top
	} else if ( overTop > 0 ) {
	position.top += overTop;
	// too far down -> align with bottom edge
	} else if ( overBottom > 0 ) {
	position.top -= overBottom;
	// adjust based on position and margin
	} else {
	position.top = max( position.top - collisionPosTop, position.top );
	}
	}
	},
	flip: {
	left: function( position, data ) {
	var within = data.within,
	withinOffset = within.offset.left + within.scrollLeft,
	outerWidth = within.width,
	offsetLeft = within.isWindow ? within.scrollLeft : within.offset.left,
	collisionPosLeft = position.left - data.collisionPosition.marginLeft,
	overLeft = collisionPosLeft - offsetLeft,
	overRight = collisionPosLeft + data.collisionWidth - outerWidth - offsetLeft,
	myOffset = data.my[ 0 ] === "left" ?
	-data.elemWidth :
	data.my[ 0 ] === "right" ?
	data.elemWidth :
	0,
	atOffset = data.at[ 0 ] === "left" ?
	data.targetWidth :
	data.at[ 0 ] === "right" ?
	-data.targetWidth :
	0,
	offset = -2 * data.offset[ 0 ],
	newOverRight,
	newOverLeft;

	if ( overLeft < 0 ) {
	newOverRight = position.left + myOffset + atOffset + offset + data.collisionWidth - outerWidth - withinOffset;
	if ( newOverRight < 0 \|\| newOverRight < abs( overLeft ) ) {
	position.left += myOffset + atOffset + offset;
	}
	}
	else if ( overRight > 0 ) {
	newOverLeft = position.left - data.collisionPosition.marginLeft + myOffset + atOffset + offset - offsetLeft;
	if ( newOverLeft > 0 \|\| abs( newOverLeft ) < overRight ) {
	position.left += myOffset + atOffset + offset;
	}
	}
	},
	top: function( position, data ) {
	var within = data.within,
	withinOffset = within.offset.top + within.scrollTop,
	outerHeight = within.height,
	offsetTop = within.isWindow ? within.scrollTop : within.offset.top,
	collisionPosTop = position.top - data.collisionPosition.marginTop,
	overTop = collisionPosTop - offsetTop,
	overBottom = collisionPosTop + data.collisionHeight - outerHeight - offsetTop,
	top = data.my[ 1 ] === "top",
	myOffset = top ?
	-data.elemHeight :
	data.my[ 1 ] === "bottom" ?
	data.elemHeight :
	0,
	atOffset = data.at[ 1 ] === "top" ?
	data.targetHeight :
	data.at[ 1 ] === "bottom" ?
	-data.targetHeight :
	0,
	offset = -2 * data.offset[ 1 ],
	newOverTop,
	newOverBottom;
	if ( overTop < 0 ) {
	newOverBottom = position.top + myOffset + atOffset + offset + data.collisionHeight - outerHeight - withinOffset;
	if ( ( position.top + myOffset + atOffset + offset) > overTop && ( newOverBottom < 0 \|\| newOverBottom < abs( overTop ) ) ) {
	position.top += myOffset + atOffset + offset;
	}
	}
	else if ( overBottom > 0 ) {
	newOverTop = position.top - data.collisionPosition.marginTop + myOffset + atOffset + offset - offsetTop;
	if ( ( position.top + myOffset + atOffset + offset) > overBottom && ( newOverTop > 0 \|\| abs( newOverTop ) < overBottom ) ) {
	position.top += myOffset + atOffset + offset;
	}
	}
	}
	},
	flipfit: {
	left: function() {
	$.ui.position.flip.left.apply( this, arguments );
	$.ui.position.fit.left.apply( this, arguments );
	},
	top: function() {
	$.ui.position.flip.top.apply( this, arguments );
	$.ui.position.fit.top.apply( this, arguments );
	}
	}
	};

	// fraction support test
	(function () {
	var testElement, testElementParent, testElementStyle, offsetLeft, i,
	body = document.getElementsByTagName( "body" )[ 0 ],
	div = document.createElement( "div" );

	//Create a "fake body" for testing based on method used in jQuery.support
	testElement = document.createElement( body ? "div" : "body" );
	testElementStyle = {
	visibility: "hidden",
	width: 0,
	height: 0,
	border: 0,
	margin: 0,
	background: "none"
	};
	if ( body ) {
	$.extend( testElementStyle, {
	position: "absolute",
	left: "-1000px",
	top: "-1000px"
	});
	}
	for ( i in testElementStyle ) {
	testElement.style[ i ] = testElementStyle[ i ];
	}
	testElement.appendChild( div );
	testElementParent = body \|\| document.documentElement;
	testElementParent.insertBefore( testElement, testElementParent.firstChild );

	div.style.cssText = "position: absolute; left: 10.7432222px;";

	offsetLeft = $( div ).offset().left;
	$.support.offsetFractions = offsetLeft > 10 && offsetLeft < 11;

	testElement.innerHTML = "";
	testElementParent.removeChild( testElement );
	})();

	}( jQuery ) );
	function initMyBookmarklet() {
	(window.myBookmarklet = function() {

	// blow away customizations to underscore template parsing (eg 500px)
	_.templateSettings.interpolate = /<%=([\s\S]+?)%>/g
	_.templateSettings.evaluate = /<%([\s\S]+?)%>/g

	// TODO: simplify state handling on multiple-clicks of bookmarklet
	RuleOfThirds.stateMachine.advance();
	})();
	}

	// inspired by http://lamehacks.net/blog/implementing-a-state-machine-in-javascript/
	RuleOfThirds = window.RuleOfThirds \|\| {}
	RuleOfThirds.stateMachine = RuleOfThirds.stateMachine \|\| new (function (){
	states = [
	{ name:'OFF',
	onEnter: function() {
	removeOverlays();
	}
	},
	{ name:'GRID_THIRDS',
	onEnter: function() {
	removeOverlays(); // unnecessary due to order of state advance()
	createOverlays(function(width, height) { return getSVGOverlayThirdsGrid(width, height, "GRID_THIRDS")} );
	}
	},
	{ name:'GRID_PHI',
	onEnter: function() {
	removeOverlays(); // unnecessary due to order of state advance()
	createOverlays(function(width, height) { return getSVGOverlayThirdsGrid(width, height, "GRID_PHI")} );
	}
	},
	{ name:'TRIANGLES',
	onEnter: function() {
	removeOverlays(); // unnecessary due to order of state advance()
	createOverlays(function(width, height) { return getSVGOverlayThirdsGrid(width, height, "TRIANGLES")} );
	}
	},
	{ name:'TRIANGLES_90',
	onEnter: function() {
	removeOverlays(); // unnecessary due to order of state advance()
	createOverlays(function(width, height) { return getSVGOverlayThirdsGrid(width, height, "TRIANGLES_90")} );
	}
	},
	{ name:'SPIRAL_0',
	onEnter: function() {
	removeOverlays();
	createOverlays(function(width,height,degrees) { return getSVGOverlaySpiral(width, height, "SPIRAL_0"); });
	}
	},
	{ name:'SPIRAL_90',
	onEnter: function() {
	removeOverlays();
	createOverlays(function(width,height,degrees) { return getSVGOverlaySpiral(width, height, "SPIRAL_90"); });
	}
	},
	{ name:'SPIRAL_180',
	onEnter: function() {
	removeOverlays();
	createOverlays(function(width,height,degrees) { return getSVGOverlaySpiral(width, height, "SPIRAL_180"); });
	}
	},
	{ name:'SPIRAL_270',
	onEnter: function() {
	removeOverlays();
	createOverlays(function(width,height,degrees) { return getSVGOverlaySpiral(width, height, "SPIRAL_270"); });
	}
	}
	];

	this.currentState = states[0];
	this.advance = function(){
	this.currentState = states[(states.indexOf(this.currentState) + 1) % states.length];
	this.currentState.onEnter();
	}
	})();

	/*
	* Removes RuleOfThirds overlays.
	*/
	function removeOverlays() {
	if (jQuery('.rule-of-thirds').remove().length) {
	jQuery('.rule-of-thirds-wrapper > img').unwrap();
	}
	}

	function createOverlays(overlayFactory) {
	jQuery('img').each(function(){
	window.el = jQuery(this);
	var el = jQuery(this),
	w = el.width(),
	h = el.height(),
	src = el.attr('src') \|\| "",
	useWrapper = (el.siblings().length == 0) && (el.offsetParent().width() == w)

	//skip small or invisible images
	if (!el.is(':visible') \|\| w < 100 \|\| h < 100) {
	return;
	}

	window.overlay = jQuery('<div />')
	.addClass('rule-of-thirds')
	.css( {
	'position': 'absolute',
	'pointer-events':'none',
	'width': w,
	'height': h,
	})
	.attr('rel',src \|\| "" ) // "undefined" chokes .attr; http://bit.ly/134P0C9
	.append(overlayFactory(w,h))
	// .append(getCanvasOverlay(w,h))

	if (useWrapper) { // should be fairly harmless; fixes pinterest zoom
	var wrapper = jQuery('<div />')
	.addClass('rule-of-thirds-wrapper')
	.css({
	'position':'relative',
	'display' : 'inline-block', //fixes super-long pins eg http://pinterest.com/pin/552113235537700759/
	'text-align' : 'center',
	})
	.appendTo(el.parent())
	.append(el)
	.append(overlay);

	overlay.css({
	'width' : '100%',
	'height' : '100%',
	'top': '0px',
	'left': '0px',
	});
	} else {
	overlay.insertAfter(el);
	//XXX: why does overlay.position need to be run twice on http://bl.ocks.org/4331769
	// console.log("img offset", el.position());
	// console.log("overlay offset", overlay.position());
	overlay.position({"of": el, at: "center"});
	// console.log("overlay offset", overlay.position());
	overlay.position({"of": el, at: "center"});
	// console.log("overlay offset", overlay.position());
	}
	});
	}


	//from http://en.wikipedia.org/wiki/File:Fibonacci_spiral.svg
	// according to lightroom this is the vertical orientation.
	// for horizontal images, need to rotate 90 degrees CW
	function getSVGOverlaySpiralTemplate() {
	var svg = '<svg\
	xmlns:dc="http://purl.org/dc/elements/1.1/"\
	xmlns:xlink="http://www.w3.org/1999/xlink"\
	xmlns:cc="http://web.resource.org/cc/"\
	xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"\
	xmlns:svg="http://www.w3.org/2000/svg"\
	xmlns="http://www.w3.org/2000/svg"\
	xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"\
	xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"\
	id="svg2"\
	sodipodi:version="0.32"\
	inkscape:version="0.44"\
	version="1.0"\
	viewbox="<%= viewbox %>"\
	preserveAspectRatio="none"\
	sodipodi:docname="Fibonacci_spiral.svg">\
	<defs>\
	<g id="spiral" >\
	<path id="path1873" sodipodi:type="arc"\
	vector-effect="non-scaling-stroke"\
	sodipodi:cx="337.94031" sodipodi:cy="2354.0146" sodipodi:rx="301.58487" sodipodi:ry="281.75464"\
	d="M 36.355438,2354.0146 A 301.58487,281.75464 0 0 1 337.94031,2072.26"\
	sodipodi:start="3.1415927" sodipodi:end="4.712389" sodipodi:open="true"\
	transform="matrix(2.022351,0,0,2.164687,-73.02346,-4485.255)"\
	vector-effect="non-scaling-stroke" />\
	<path id="path1875" sodipodi:type="arc"\
	transform="matrix(-1.247009,0,0,1.334775,1031.657,-2765.459)"\
	sodipodi:open="true" sodipodi:end="4.712389" sodipodi:start="3.1415927"\
	d="M 36.355438,2354.0146 A 301.58487,281.75464 0 0 1 337.94031,2072.26"\
	vector-effect="non-scaling-stroke"\
	sodipodi:ry="281.75464" sodipodi:rx="301.58487" sodipodi:cy="2354.0146" sodipodi:cx="337.94031"\
	vector-effect="non-scaling-stroke" />\
	<path id="path2762" sodipodi:type="arc"\
	sodipodi:cx="337.94031" sodipodi:cy="2354.0146" sodipodi:rx="301.58487" sodipodi:ry="281.75464"\
	d="M 36.355438,2354.0146 A 301.58487,281.75464 0 0 1 337.94031,2072.26"\
	sodipodi:start="3.1415927" sodipodi:end="4.712389" sodipodi:open="true"\
	transform="matrix(0,-0.770297,-0.824511,0,2694.923,636.9008)"\
	vector-effect="non-scaling-stroke" />\
	<path id="path2764" sodipodi:type="arc"\
	transform="matrix(0.473354,0,0,-0.50667,594.0855,1658.848)"\
	sodipodi:open="true" sodipodi:end="4.712389" sodipodi:start="3.1415927"\
	d="M 36.355438,2354.0146 A 301.58487,281.75464 0 0 1 337.94031,2072.26"\
	sodipodi:ry="281.75464" sodipodi:rx="301.58487" sodipodi:cy="2354.0146" sodipodi:cx="337.94031"\
	vector-effect="non-scaling-stroke" />\
	<path id="path2766" sodipodi:type="arc"\
	sodipodi:cx="337.94031" sodipodi:cy="2354.0146" sodipodi:rx="301.58487" sodipodi:ry="281.75464"\
	d="M 36.355438,2354.0146 A 301.58487,281.75464 0 0 1 337.94031,2072.26"\
	sodipodi:start="3.1415927" sodipodi:end="4.712389" sodipodi:open="true"\
	transform="matrix(0.290281,0,0,0.310712,600.7412,-265.2473)"\
	vector-effect="non-scaling-stroke" />\
	<path id="path2768" sodipodi:type="arc"\
	transform="matrix(-0.181793,0,0,0.194589,760.2218,-24.60904)"\
	sodipodi:open="true" sodipodi:end="4.712389" sodipodi:start="3.1415927"\
	d="M 36.355438,2354.0146 A 301.58487,281.75464 0 0 1 337.94031,2072.26"\
	sodipodi:ry="281.75464" sodipodi:rx="301.58487" sodipodi:cy="2354.0146" sodipodi:cx="337.94031"\
	vector-effect="non-scaling-stroke" />\
	<path id="path2770" sodipodi:type="arc"\
	sodipodi:cx="337.94031" sodipodi:cy="2354.0146" sodipodi:rx="301.58487" sodipodi:ry="281.75464"\
	d="M 36.355438,2354.0146 A 301.58487,281.75464 0 0 1 337.94031,2072.26"\
	sodipodi:start="3.1415927" sodipodi:end="4.712389" sodipodi:open="true"\
	transform="matrix(-0.109629,0,0,-0.117346,757.5983,709.0538)"\
	vector-effect="non-scaling-stroke" />\
	<path id="path2772" sodipodi:type="arc"\
	transform="matrix(6.725143e-2,0,0,-7.198541e-2,697.9484,615.0548)"\
	sodipodi:open="true" sodipodi:end="4.712389" sodipodi:start="3.1415927"\
	d="M 36.355438,2354.0146 A 301.58487,281.75464 0 0 1 337.94031,2072.26"\
	sodipodi:ry="281.75464" sodipodi:rx="301.58487" sodipodi:cy="2354.0146" sodipodi:cx="337.94031"\
	vector-effect="non-scaling-stroke"\ />\
	</g>\
	<g id="rectangles">\
	<path d="M 754.24901,466.52217 L 610.30258,466.52217" id="rect2800" sodipodi:nodetypes="cc" vector-effect="non-scaling-stroke" />\
	<path d="M 754.24901,377.48564 L 754.24901,610.4945" id="rect2802" sodipodi:nodetypes="cc" vector-effect="non-scaling-stroke" />\
	<path d="M 610.30252,377.48564 L 987.15967,377.48564" id="rect2804" sodipodi:nodetypes="cc" vector-effect="non-scaling-stroke" />\
	<path d="M 610.30252,610.49292 L 610.30252,0.50000006" id="rect2806" sodipodi:nodetypes="cc" vector-effect="non-scaling-stroke" />\
	</g>\
	</defs>\
	<% _.each(transform, function(t) { %>\
	<g id="drawing" transform="<%= t %>">\
	<% }); %>\
	<use xlink:href="#rectangles" style="vector-effect:none; stroke: grey; stroke-width: 4;"/>\
	<use xlink:href="#rectangles" style="vector-effect:none; stroke: white; stroke-width: 2;"/>\
	<use xlink:href="#spiral" style="fill:none; stroke: grey; stroke-width: 4;" />\
	<use xlink:href="#spiral" style="fill:none; stroke: white; stroke-width: 2;" />\
	<% _.each(transform, function(t) { %>\
	</g>\
	<% }); %>\
	</svg>';
	return svg;
	}

	function getSVGOverlaySpiral(width, height, type) {

	//corresponds to values hardcoded in SVG template
	var viewboxWidth = 987.6,
	viewboxHeight = 611,
	viewbox = [0, 0, viewboxWidth, viewboxHeight].join(','),
	// rotation
	needsRotation = (width < height),
	viewboxCenterX = viewboxWidth / 2,
	viewboxCenterY = viewboxHeight / 2,
	rotationTransform = 'rotate(' + [90, viewboxCenterX, viewboxCenterY].join(",") + ')',
	// after rotating around (W/2,H/2), recenter around (H/2,W/2)
	translateX = viewboxCenterY - viewboxCenterX,
	translateY = viewboxCenterX - viewboxCenterY;
	translationTransform = 'translate(' + translateX + ',' + translateY + ')';

	// from http://tech.groups.yahoo.com/group/svg-developers/message/14903
	var transformations = [];

	if (needsRotation) {
	// Note: SVG transformation order is important and counter-intuitive
	transformations.push(translationTransform, rotationTransform);
	viewbox = [0, 0, viewboxHeight, viewboxWidth].join(',');
	}

	switch (type) {
	case "SPIRAL_90":
	var transform = 'matrix(-1,0,0,1,' + viewboxWidth +',0)'; //horizontal flip
	// var transform = 'rotate(90 494 306)';
	break;
	case "SPIRAL_180":
	var transform = 'matrix(-1,0,0,-1,' + viewboxWidth +',' + viewboxHeight + ')'; // vertical + horizontal flip
	break;
	case "SPIRAL_270":
	var transform = '';
	var transform = 'matrix(1,0,0,-1,0,' + viewboxHeight + ')'; //horizontal flip
	break;
	case "SPIRAL_0":
	default:
	var transform = '';
	}

	if (transform) {
	transformations.push(transform);
	}

	var svg = _.template(getSVGOverlaySpiralTemplate(), {
	transform: transformations,
	viewbox: viewbox
	});

	// because firefox seems to need this; see /tests/svg-viewbox.html
	svg = jQuery(svg).css({
	width: '100%',
	height: '100%'
	});
	return svg;
	}



	function getSVGOverlayThirdsGridTemplate() {
	// multiline strings in JS require trailing backslashes
	// including the <?xml tag causes errors, so we remove it
	// var svg = '<?xml version="1.0" standalone="no"?><!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">\
	var svg = '<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">\
	<svg xmlns="http://www.w3.org/2000/svg" version="1.1" viewbox="<%= viewbox %>" preserveAspectRatio="none">\
	<% _.each(lines, function(line) { %>\
	<polyline points="<%= line %>" style="stroke: grey; stroke-width:4;" vector-effect="non-scaling-stroke" />\
	<polyline points="<%= line %>" style="stroke: white; stroke-width:2;" vector-effect="non-scaling-stroke" />\
	<% }); %>\
	</svg>';
	return svg;
	}

	function getSVGOverlayThirdsGrid(width, height, type) {

	/* \| \|
	--+--+-- h1
	\| \|
	--+--+-- h2
	\| \|
	v1 v2 */


	switch (type) {
	case "TRIANGLES":
	var w = width, h = height, w_sq = Math.pow(w,2), h_sq = Math.pow(h,2);
	var lines = {
	d1: [0, 0, (h_sq * w)/(w_sq + h_sq), h * w_sq / (w_sq + h_sq)],
	d2: [w - (h_sq * w)/(w_sq + h_sq), h - h * w_sq / (w_sq + h_sq), w, h],
	d3: [0, h, w, 0],
	};
	break;
	case "TRIANGLES_90":
	var w = width, h = height, w_sq = Math.pow(w,2), h_sq = Math.pow(h,2);
	// vertical axis mirror from TRIANGLES
	var lines = {
	d1: [w, 0, w - (h_sq * w)/(w_sq + h_sq), h * w_sq / (w_sq + h_sq)],
	d2: [(h_sq * w)/(w_sq + h_sq), h - h * w_sq / (w_sq + h_sq), 0, h],
	d3: [0,0,w,h]
	};
	break;
	case "GRID_PHI":
	var phi = 1.6180339887;
	var v1 = width * (1-(1/phi)),
	v2 = width * (1/phi),
	h1 = height * (1-(1/phi)),
	h2 = height * (1/phi);
	var lines = {
	h1: [0, h1, width, h1],
	h2: [0, h2, width, h2],
	v1: [v1, 0, v1, height],
	v2: [v2, 0, v2, height]
	};
	break;
	case "GRID_THIRDS":
	default:
	var v1 = width * (1/3),
	v2 = width * (2/3),
	h1 = height * (1/3),
	h2 = height * (2/3);
	var lines = {
	h1: [0, h1, width, h1],
	h2: [0, h2, width, h2],
	v1: [v1, 0, v1, height],
	v2: [v2, 0, v2, height]
	};
	}


	// inspired by https://github.com/documentcloud/underscore/issues/220
	function objectMapPreserveKeys(obj,map) {
	return _.reduce(obj, function(memo,v,k) { memo[k] = map(v); return memo; }, {});
	}

	var svg = _.template(getSVGOverlayThirdsGridTemplate(), {
	viewbox: [0,0,width,height].join(" "),
	lines: _.map(lines, function(v) { return v[0] + "," + v[1] + " " + v[2] + "," + v[3]; })
	});

	return jQuery(svg);
	}


	function getCanvasOverlay(width,height){
	var canvas = jQuery('<canvas />')
	.attr({
	'width':width,
	'height':height
	});

	var ctx = canvas[0].getContext('2d');

	var drawLine = function(line,strokeStyle,lineWidth) {
	var x1 = line[0],
	y1 = line[1],
	x2 = line[2],
	y2 = line[3];
	ctx.beginPath();
	ctx.strokeStyle = strokeStyle;
	ctx.lineWidth = lineWidth;
	ctx.moveTo(x1,y1);
	ctx.lineTo(x2,y2);
	ctx.stroke();
	}

	function drawLines(lines,color,size) {
	lines.forEach(function(line) {
	drawLine(line,color,size);
	});
	}

	/* \| \|
	--+--+-- h1
	\| \|
	--+--+-- h2
	\| \|
	v1 v2 */

	var h1 = [0, height/3, width, height/3],
	h2 = [0, 2height/3, width, 2height/3],
	v1 = [width/3, 0, width/3, height],
	v2 = [2width/3, 0, 2width/3, height];

	var lines = [h1,h2,v1,v2];

	drawLines(lines,'white',12);
	drawLines(lines,'black',4);

	return canvas;
	}

	(function(){
	var done = false;
	var script = document.createElement("script");
	script.src = "//cdnjs.cloudflare.com/ajax/libs/yepnope/1.5.4/yepnope.min.js";
	script.onload = script.onreadystatechange = function(){
	if (!done && (!this.readyState \|\| this.readyState == "loaded" \|\| this.readyState == "complete")) {
	done = true;
	requireDeps();
	}
	};
	document.getElementsByTagName("head")[0].appendChild(script);
	})();

	function requireDeps() {
	function isUndefined(val) {
	return typeof(val) === "undefined";
	}

	var needJq = isUndefined(window.jQuery) \|\| jQuery.fn.jquery.match(/^1\.[0-9]+/) <= 1.4,
	needJqUiPosition = isUndefined(window.jQuery) \|\| isUndefined(jQuery.ui) \|\| isUndefined(jQuery.ui.position),
	needUnderscore = isUndefined(window._) \|\| isUndefined(_.template);

	yepnope([{
	test: needJq,
	yep: '//cdnjs.cloudflare.com/ajax/libs/jquery/1.4.4/jquery.min.js',
	}, {
	// check for jQuery.ui.position
	test: needJqUiPosition,
	yep: 'https://gist.github.com/raw/4331769/dbfadedd1691b5e5fa006062682bab14390bec52/jquery.ui.position.js'
	}, {
	// check for jQuery.ui.position
	test: needUnderscore,
	yep: '//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.3/underscore-min.js',
	complete: function (url, result, key) {
	initMyBookmarklet();
	// TODO: makes our jQuery version not clobber pre-existing one (eg for pinterest)
	// jQuery.noConflict(true) doesn't seem to work properly
	}
	}
	]);

	}
	div.imgWrapper.enabled {
	position: relative;
	display: inline-block;
	}
	div.imgWrapper.enabled:before {
	background:url("https://gist.github.com/raw/4331769/rule-of-thirds.png");
	background-size: 100% 100%;
	background-repeat:no-repeat;
	width:100%;
	height: 100%;
	z-index: 1;
	top:0;
	left:0;
	position: absolute;
	content: " ";
	}
	div.imgWrapper.enabled>img {
	filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale"); /* Firefox 10+, Firefox on Android */
	-webkit-filter: grayscale(100%);
	-moz-filter: grayscale(100%);
	-ms-filter: grayscale(100%);
	-o-filter: grayscale(100%);
	filter: grayscale(100%);
	}
	<h1> Spiral on Vertical Image </h1>

	<img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f9/Mona_Lisa%2C_by_Leonardo_da_Vinci%2C_from_C2RMF_natural_color.jpg/401px-Mona_Lisa%2C_by_Leonardo_da_Vinci%2C_from_C2RMF_natural_color.jpg" width="401" height="599">

	<script type="text/javascript" src="/rule-of-thirds.bookmarklet.js"></script>
	<script type="text/javascript">
	//overrides standard behavior
	function initMyBookmarklet() {
	createOverlays(function(width,height,degrees) {
	return getSVGOverlaySpiral(width, height, "SPIRAL_270");
	});
	}
	</script>

	<style>
	svg {
	border: 2px solid green;
	}
	div {
	border: 2px solid blue;
	}
	</style>
	<h1> SVG viewbox rotation </h1>

	This demonstrates what it takes to achieve rotating the svg. Note that the red lines are originally horizontal.
	Pay attention to the following:

	<li> rotate(90,CX,CY)
	<li> translate(CY-CX, CX-CY)
	<li> there's width on the wrapper, which is post-rotation stretched via viewbox="0,0,H,W", preserveAspectRatio=none
	<li> viewbox="0,0,H,W" instead of "0,0,W,H"

	<h2> Resources </h2>

	<li> http://en.wikipedia.org/wiki/Matrix_multiplication
	<li> http://www.w3.org/TR/SVGTiny12/coords.html#NestedTransformations
	<li> http://commons.oreilly.com/wiki/index.php/SVG_Essentials/Transforming_the_Coordinate_System
	<li> http://webdesign.about.com/od/svg/a/svg-viewbox-attribute.htm


	<div id="wrapper">
	<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
	viewboxOriginal="0,0,300,600"
	viewbox="0,0,300,600"
	preserveAspectRatio="none"
	version="1.1">
	<defs>
	<g id="horizontal-lines">
	<polyline vector-effect="non-scaling-stroke" points="0,100 600,100" />
	<polyline vector-effect="non-scaling-stroke" points="0,200 600,200" />
	</g>
	<g id="vertical-lines">
	<polyline vector-effect="non-scaling-stroke" points="200,0 200,300" />
	<polyline vector-effect="non-scaling-stroke" points="400,0 400,300" />
	</g>
	</defs>
	<g transform="translate(-150,150)">
	<g transform="rotate(90,300,150)">
	<use xlink:href="#horizontal-lines" style="stroke: red; stroke-width: 2"/>
	<use xlink:href="#vertical-lines" style="stroke: black; stroke-width: 2"/>
	</g>
	</g>
	</svg>
	</div>

	<style>
	svg {
	border: 2px solid green;
	}
	div#wrapper {
	border: 2px solid blue;
	width: 450px;
	height: 900px;
	}
	</style>
	<h1> SVG viewbox </h1>

	<p>This demonstrates that an embedded SVG is sized differently in chrome and firefox.
	It seems that firefox just ignores preserveAspectRatio.

	<p>The following CSS demonstrates a workaround: <pre>svg:hover { width:100%; height: 100%}</pre>

	<div id="wrapper">
	<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
	viewbox="0,0,600,300"
	preserveAspectRatio="none"
	version="1.1">
	<defs>
	<g id="horizontal-lines">
	<polyline vector-effect="non-scaling-stroke" points="0,100 600,100" />
	<polyline vector-effect="non-scaling-stroke" points="0,200 600,200" />
	</g>
	<g id="vertical-lines">
	<polyline vector-effect="non-scaling-stroke" points="200,0 200,300" />
	<polyline vector-effect="non-scaling-stroke" points="400,0 400,300" />
	</g>
	</defs>
	<use xlink:href="#horizontal-lines" style="stroke: red; stroke-width: 2"/>
	<use xlink:href="#vertical-lines" style="stroke: black; stroke-width: 2"/>
	</svg>
	</div>

	<style>
	svg {
	border: 2px solid green;
	}
	svg:hover {
	width: 100%;
	height: 100%;
	}
	div#wrapper {
	border: 2px solid blue;
	width: 150px;
	height: 300px;
	}
	</style>

	<h2> Resources </h2>

	<li> http://webdesign.about.com/od/svg/a/svg-viewbox-attribute.htm
	<li> https://bugzilla.mozilla.org/show_bug.cgi?id=777265
	<li> http://jsfiddle.net/gonsfx/Rm2LE/ "Firefox PreserveAspectRatio BUG"
	<li> http://stackoverflow.com/questions/644896/how-do-i-scale-a-stubborn-svg-embedded-with-the-object-tag
	<li> http://stackoverflow.com/questions/10524978/html5-svg-preserveaspectratio-none-not-working-in-firefox