A Pen by Tomasz Foster.

Caffeine-Animation.markdown

Caffeine Animation

HTML5 and JavaScript animation that shows the molecular structure of Caffeine. The double bonds in Caffeine are displayed by darkening the lines.

A Pen by Tomasz Foster on CodePen.

License.

index.html

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.9.2/jquery-ui.js"></script>


<div class="caffeine">
	    		<div class="startText">
		    		<p>move your mouse here</p>
		    		<img src="https://raw.github.com/TomaszFoster/tomaszfoster.github.io/master/img/arrow.png" class="arrow">
		    	</div>
	    		<div id="container" style="height:200px;width:200px"></div>
	    		<h2>caffeine</h2>
	    	</div>
<script src="http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v4.5.5.min.js"></script>

script.js

/*This JavaScript is an animation that, upon mouseover, will reveal
a caffeine molecule, complete with darker bonds that signify the
double bonds.

One improvement I'd like to make later would be to assign the ending locations
geometrically, versus using key-value pairs for the ending locations.
This would also allow me to dynamically name and create tweens based 
upon the number of keys. Another day... */

//first, let's set the stage
var stage = new Kinetic.Stage({
  container: 'container',
  width: 200,
  height: 200
});
//create a layer in this stage
var layer = new Kinetic.Layer({
  y: -30,
  x: 10
});

//hexagon numbers
var h1 = 34.4;
var h2 = 20;
//pentagon numbers
var p1 = 12.3;
var p2 = 38;
var p3 = 23.5;
var p4 = 32.4;
  /* here are the key-value pairs for the ending coordinates.*/
var points = {1:[50, 260, 50, 220],
              2:[50, 220, 50+h1, 220-h2],
              3:[50+h1, 220-h2, 50+(2*h1), 220],
              4:[50+(2*h1), 220, 50+(2*h1), 260],
              5:[50+(2*h1), 260, 50+h1, 260+h2],
              6:[50+h1, 260+h2, 50, 260],
              7:[50, 220, 50-h1, 220-h2],
              8:[50+h1, 220-h2, 50+h1, 180-h2],
              9:[50, 260, 50-h1, 260+h2],
              10:[50+h1, 260+h2, 50+h1, 300+h2],
              11:[50+(2*h1), 260, 50+(2*h1)+p2, 260+p1],
              12:[50+(2*h1), 220, 50+(2*h1)+p2, 220-p1],
              13:[50+(2*h1)+p2, 220-p1, 50+(2*h1)+p2+p3, 240],
              14:[50+(2*h1)+p2+p3, 240, 50+(2*h1)+p2, 260+p1],
              15:[50+(2*h1)+p2, 220-p1, 50+(2*h1)+p2+p1, 220-p2-p1]
             };

//create key-value pairs for the tweens
var tweens = {};

/*now, let's make each 'stick' and assign it (almost) the same
properties, only variation is in the starting points, where I shift
them each by 5 pixels, since they each have a strokeWidth of 5 */
var list = {};
for(i=0;i<15;i++){
  var temp = 'stick'+(i+1);
  list[temp] = new Kinetic.Spline({
    points: [60+(i*5), 130, 60+(i*5), 90], //here's the only difference
    tension: 0.5,
    opacity: 0.6,
    stroke: '#FFF',
    strokeWidth: 5,
    lineCap: 'round'
  });
  //add each new layer
  layer.add(list[temp]);
  
  var temp = 'stick'+i+'Tween';
  //the tweens with single bonds depicted with opacity = 0.6
  if (i!=3 && i!=7 && i!=8 && i!=13){
    tweens[temp] = new Kinetic.Tween({
        node: list['stick'+(i+1)],
        duration: 1,
        easing: Kinetic.Easings.EaseOut,
        y: -100,
        opacity: 0.5,
        points: points[i+1]
      });
  }else{
    //the tweens with double bonds depicted with opacity = 1.0
    tweens[temp] = new Kinetic.Tween({
        node: list['stick'+(i+1)],
        duration: 1,
        easing: Kinetic.Easings.EaseOut,
        y: -100,
        opacity: 1,
        points: points[i+1]
      });
  }
}

//now add all the layers to the stage
stage.add(layer);
var keys = Object.keys(tweens);
//on mouseover, play all the tweens
stage.getContainer().addEventListener('mouseover', function() {
  for(i=0;i<15;i++){
    tweens[keys[i]].play();
  }
 
});

//on mouseout, reverse the tweens
stage.getContainer().addEventListener('mouseout', function() {
  for(i=0;i<16;i++){
    tweens[keys[i]].reverse();
  }
  
});

 // here's the transform for the alternative text
$("#container").hover(
  function(){
    $(".altText").animate({ color: "#CCC" }, 2000);
    $(".startText").animate({ color: "#301E12" }, 1000);
    $(".arrow").animate({opacity: 0}, 1000);
  },
  function(){
    $(".altText").animate({ color: "#301E12" }, 1000);
  }
);

style.css

body {
  background: #301E12;
}
.caffeine { position: absolute; top:50%; left:50%; margin:-200px 0 0 -100px; }

.caffeine h2 {
	font-family: helvetica;
	font-size: 50px;
	color:#DDD;
	text-align: center;
	text-shadow: 2px 2px #666;
  margin-top:0px;
}
.caffeine .altText {
	font-family: helvetica;
	font-size: 20px;
	color:#301E12;
	text-align: center;
}
.startText {
	font-family: helvetica;
	font-size: 15px;
	color:#CCC;
	text-align: center;
	margin-right: 50px;

}
.startText img {
	position: absolute;
	margin-left: 100px;
  margin-top: -40px;
}
.altText {
  margin-top:-20px;
}