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| - | <!doctype html>
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| - | <html>
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| - | <script>
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| - | window.requestAnimFrame = (function(callback) { //sending all screen repaints to browser
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| - | return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame ||
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| - | function(callback) {
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| - | window.setTimeout(callback, 1000 / 60);
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| - | };
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| - | })();
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| | | | |
| - | function drawRectangle(myRectangle, context) { //draws a rectangle
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| - | context.beginPath();
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| - | context.rect(myRectangle.x, myRectangle.y, myRectangle.width, myRectangle.height);
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| - | context.fillStyle = '#8ED6FF';
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| - | context.fill();
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| - | context.lineWidth = myRectangle.borderWidth;
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| - | context.strokeStyle = 'black';
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| - | context.stroke();
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| - | }
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| - |
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| - | function drawCircle(myCircle, context) { //custom circle
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| - | context.beginPath(); //places pen down
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| - | context.arc(myCircle.x, myCircle.y, myCircle.radius, 0, 2*Math.PI); //draws arc
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| - | context.fillStyle = '#8ED6FF';
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| - | context.fill();
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| - | context.lineWidth = myCircle.borderWidth;
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| - | context.strokeStyle = 'black';
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| - | context.stroke();
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| - | }
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| - |
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| - | function animate(myCircle, canvas, context, startTime) {
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| - | // update
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| - | var time = (new Date()).getTime() - startTime;
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| - |
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| - | var linearSpeed = 200;
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| - | // pixels / second
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| - | var newX = linearSpeed * time / 1000;
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| - |
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| - | if(newX < canvas.width - myCircle.radius - myCircle.borderWidth / 2) {
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| - | myCircle.x = newX;
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| - | }
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| - |
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| - | // clear
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| - | context.clearRect(0, 0, canvas.width, canvas.height);
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| - |
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| - | drawCircle(myCircle, context);
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| - |
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| - | // request new frame
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| - | requestAnimFrame(function() {
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| - | animate(myCircle, canvas, context, startTime);
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| - | });
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| - | }
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| - | var canvas = document.getElementById('bioCanvas');
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| - | var context = canvas.getContext('2d');
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| - | context.canvas.width = window.innerWidth;
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| - | context.canvas.height = .9*window.innerHeight;
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| - | var myRectangle = {
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| - | x: 0,
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| - | y: 75,
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| - | width: 100,
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| - | height: 50,
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| - | borderWidth: 5
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| - | };
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| - |
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| - | var myCircle = {
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| - | x: 0,
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| - | y: 75,
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| - | radius: 50,
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| - | borderWidth: 5
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| - | };
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| - |
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| - | drawCircle(myCircle, context);
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| - |
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| - | // wait one second before starting animation
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| - | setTimeout(function() {
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| - | var startTime = (new Date()).getTime();
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| - | animate(myCircle, canvas, context, startTime);
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| - | }, 500);
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| - | </script>
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| - | </body>
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| - | </html>
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"
