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test of d3.hexbin with walmart locations
<html>
<head>
<title>Walmart locations all hexed up</title>
http://mbostock.github.com/d3/d3.js
<!-- styles -->
<link rel="stylesheet" type="text/css" href="http://indiemaps.github.com/hexbin-js/style/main.css" />
<link rel="stylesheet" type="text/css" href="http://indiemaps.github.com/hexbin-js/style/colorbrewer.css" />
<link rel="stylesheet" type="text/css" href="http://indiemaps.github.com/hexbin-js/style/colorbrewer.stroke.css" />
<style type="text/css">
@import url("http://polymaps.org/style.css");
div.map {
width: 600px;
height: 600px;
margin-right: 15px;
float: left;
}
svg {
display: block;
}
circle {
stroke: yellow;
fill: red;
fill-opacity: 1;
}
</style>
<!-- external libraries ( d3.js, polymaps, and HEX.js ) -->
<script type="text/javascript" src="http://indiemaps.github.com/hexbin-js/lib/d3.js"></script>
<script type="text/javascript" src="http://indiemaps.github.com/hexbin-js/lib/d3.geo.js"></script>
<script type="text/javascript" src="http://indiemaps.github.com/hexbin-js/lib/polymaps.js"></script>
<script type="text/javascript" src="http://indiemaps.github.com/hexbin-js/lib/hex.js"></script>
<!-- indiemaps hexgrid layout -->
<script type="text/javascript" src="http://indiemaps.github.com/hexbin-js/src/d3.hexbin.js"></script>
<script type="text/javascript">
var po = org.polymaps,
hexset, hexI = 12, map, focusMap, data, scale, countMax,
numClasses = 9,
xMin, xMax, yMin, yMax,
cbScheme = "YlGnBu",
focusPointLayer, focusHex, focusNonHex,
dataURL = 'http://indiemaps.github.com/hexbin-js/data/json/139309.json';
function init()
{
create_basemaps();
load_json();
};
function create_basemaps()
{
map = po.map()
.container( d3.select( "#overviewMap" ).append( "svg:svg" ).node() );
map.add(po.image()
.url(po.url("http://{S}tile.cloudmade.com"
+ "/1a1b06b230af4efdbb989ea99e9841af" // http://cloudmade.com/register
+ "/999/256/{Z}/{X}/{Y}.png")
.hosts(["a.", "b.", "c.", ""])));
focusMap = po.map()
.container( d3.select( "#focusMap" ).append( "svg:svg" ).node() );
focusMap.add(po.image()
.url(po.url("http://{S}tile.cloudmade.com"
+ "/1a1b06b230af4efdbb989ea99e9841af" // http://cloudmade.com/register
+ "/999/256/{Z}/{X}/{Y}.png")
.hosts(["a.", "b.", "c.", ""])));
var focusHexLayer = d3.select( "#focusMap svg" ).insert( "svg:g" );
focusNonHex = focusHexLayer.append( "svg:path" )
.attr( "stroke", "none" )
.attr( "fill", "white" )
.attr( "fill-rule", "evenodd" )
.attr( "fill-opacity", .75 );
focusHex = focusHexLayer.append( "svg:path" )
.attr( "class", "hexagon" )
.attr( "stroke", "none" )
.attr( "stroke-width", 5 )
.attr( "fill", "none" );
focusPointLayer = d3.select( "#focusMap svg" ).insert( "svg:g" );
};
function load_json()
{
d3.json( dataURL, function( d )
{
var bounds = d.extent,
hasGeo = d.features.filter( function(wm)
{
return ( wm.geometry != null );
});
data = hasGeo;
map.extent(
[
{ lat : bounds[1], lon : bounds[0] },
{ lat : bounds[3], lon : bounds[2] }
]
).zoom(3.75);
focusMap.extent(
[
{ lat : bounds[1], lon : bounds[0] },
{ lat : bounds[3], lon : bounds[2] }
]
).zoom(9);
//draw_raw_points();
generate_hexgrid();
generate_hexgrid_representations();
});
};
function draw_raw_points()
{
var layer = d3.select( "#overviewMap svg" ).insert( "svg:g" );
var marker = layer.selectAll( "circle" )
.data( data )
.enter().append( "svg:circle" )
.attr( "r", 1.5 )
.attr( "cx", function(d) { return map.locationPoint( { lon: d.geometry.coordinates[0], lat: d.geometry.coordinates[1] } ).x; } )
.attr( "cy", function(d) { return map.locationPoint( { lon: d.geometry.coordinates[0], lat: d.geometry.coordinates[1] } ).y; } );
};
function generate_hexgrid()
{
hexset = d3.layout.hexbin()
.xValue( function(d) { return map.locationPoint( { lon: d.geometry.coordinates[0], lat: d.geometry.coordinates[1] } ).x; } )
.yValue( function(d) { return map.locationPoint( { lon: d.geometry.coordinates[0], lat: d.geometry.coordinates[1] } ).y; } )
.hexI( hexI )
( data );
countMax = d3.max( hexset, function(d) { return d.data.length; } );
scale = d3.scale.quantize()
.domain( [0,countMax] )
.range( d3.range( numClasses) );
xMin = d3.min( data, function(d)
{
return map.locationPoint( { lon: d.geometry.coordinates[0], lat: d.geometry.coordinates[1] } ).x;
}),
xMax = d3.max( data, function(d)
{
return map.locationPoint( { lon: d.geometry.coordinates[0], lat: d.geometry.coordinates[1] } ).x;
}),
yMin = d3.min( data, function(d)
{
return map.locationPoint( { lon: d.geometry.coordinates[0], lat: d.geometry.coordinates[1] } ).y;
}),
yMax = d3.max( data, function(d)
{
return map.locationPoint( { lon: d.geometry.coordinates[0], lat: d.geometry.coordinates[1] } ).y;
});
};
function generate_hexgrid_representations()
{
//draw_hexgrid();
draw_choro_grid();
};
function draw_hexgrid()
{
var layer = d3.select( "#overviewMap svg" ).insert( "svg:g" );
var marker = layer.selectAll( "polygon" )
.data( hexset )
.enter().append( "svg:polygon" )
.attr( "class", "hexagon" )
.attr( "stroke", "#09c" )
.attr( "fill", function(d) { return "none"; })
.attr( "points", function(d) { return d.pointString; } );
};
function draw_choro_grid()
{
var layer = d3.select( "#overviewMap svg" ).insert( "svg:g" ).attr( "class", cbScheme );
var marker = layer.selectAll( "polygon" )
.data( hexset )
.enter().append( "svg:polygon" )
.attr( "stroke", "none" )
.attr( "class", function(d)
{
var c = 'q' + ( (numClasses-1) - scale(d.data.length)) + "-" + numClasses;
return c;
})
.attr( "fill-opacity", function(d)
{
if ( d.data.length == 0 ) return 0;
return 1;
})
.attr( "points", function(d) { return d.pointString; } )
.on( "mouseover", function(d)
{
d3.select( this ).attr( "stroke", "#f00" ).attr( "stroke-width", 2 );
on_overviewHex_highlight(d);
})
.on( "mouseout", function(d)
{
d3.select( this ).attr( "stroke", "none" );
});
};
function on_overviewHex_highlight( hex )
{
// center focus map on this hex
center_focusMap_on_hex( hex );
// update focus hex
update_focusMap_hex( hex );
// update focus points
update_focusMap_points_by_hex( hex );
};
function center_focusMap_on_hex( hex )
{
var center = hex.centre(),
x = xMin + ( center.x * hexI - .5 * hexI ),
y = yMax - ( center.y * hexI - .5 * hexI );
var llCenter = map.pointLocation( { x : x, y : y } );
focusMap.center(llCenter);
};
function update_focusMap_hex( hex )
{
var pathString = generate_pathString_from_points( hex.points );
var extString = "M 0 0 L " + focusMap.size().x + " 0 " + focusMap.size().x + " " + focusMap.size().y + " 0 " + focusMap.size().y + " 0 0 Z";
focusNonHex.attr( 'd', extString + ' ' + pathString );
focusHex.attr( 'd', pathString );
};
function generate_pointString_from_points( points )
{
var i = 0, pt = points[i], pt_ll = map.pointLocation( pt ), pt_focus = focusMap.locationPoint( pt_ll );
var pointString = pt_focus.x + ',' + pt_focus.y;
while ( ++i < points.length )
{
pt = points[i],
pt_ll = map.pointLocation( pt ),
pt_focus = focusMap.locationPoint( pt_ll );
pointString += " " + pt_focus.x + ',' + pt_focus.y;
}
return pointString;
};
function generate_pathString_from_points( points )
{
var i = 0, pt = points[i], pt_ll = map.pointLocation( pt ), pt_focus = focusMap.locationPoint( pt_ll );
var pathString = "M " + pt_focus.x + " " + pt_focus.y + " L";
while ( ++i < points.length )
{
pt = points[i],
pt_ll = map.pointLocation( pt ),
pt_focus = focusMap.locationPoint( pt_ll );
pathString += " " + pt_focus.x + ' ' + pt_focus.y;
}
return pathString;
};
function update_focusMap_points_by_hex( hex )
{
// select
var circles = focusPointLayer.selectAll( "circle" )
.data( hex.data );
// enter
circles.enter().append( "svg:circle" )
.attr( "r", 3.5 )
.attr( "cx", function(d)
{
return focusMap.locationPoint( { lon: d.geometry.coordinates[0], lat: d.geometry.coordinates[1] } ).x;
})
.attr( "cy", function(d)
{
return focusMap.locationPoint( { lon: d.geometry.coordinates[0], lat: d.geometry.coordinates[1] } ).y;
});
// update
circles
.attr( "cx", function(d)
{
return focusMap.locationPoint( { lon: d.geometry.coordinates[0], lat: d.geometry.coordinates[1] } ).x;
})
.attr( "cy", function(d)
{
return focusMap.locationPoint( { lon: d.geometry.coordinates[0], lat: d.geometry.coordinates[1] } ).y;
});
// exit
circles.exit()
.remove();
}
</script>
</head>
<body onload="init()">
<h1>Walmart locations all hexed up</h1>
<div id="overviewMap" class="map"></div>
<div id="focusMap" class="map"></div>
</body>
</html>
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