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POSimple Canvas Rectangle Interaction with Javascript
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2013-11-15T19:32:54.663
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<p>I am trying to teach myself the basics of the Canvas tag and Javascript interaction. In the following code, I can make the rectangle expand when I hover with "onmouseover", but it will not contract when "onmouseout".</p> <pre><code><!DOCTYPE html> <html> <head> <script> window.requestAnimationFrame = (function(){ return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || function( callback ){ window.setTimeout(callback, 1000 / 60); }; })(); var rectWidth = 100; function clear() { var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d"); ctx.clearRect(0, 0, ctx.width, ctx.height); } function widenRect(){ var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d"); clear(); ctx.fillStyle="#92B901"; ctx.fillRect(0,0,rectWidth,100); if(rectWidth < 200){ rectWidth+=10; } requestAnimationFrame(widenRect); } function narrowRect(){ var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d"); clear(); ctx.fillStyle="#92B901"; ctx.fillRect(0,0,rectWidth,100); if(rectWidth > 100){ rectWidth-=10; } requestAnimationFrame(narrowRect); } </script> </head> <body> <canvas id="myCanvas" width="200" height="100" onmouseover="widenRect()" onmouseout="narrowRect()"> Your browser does not support the HTML5 canvas tag. <script> var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d"); ctx.fillStyle="#92B901"; ctx.fillRect(0,0,rectWidth,100); </script> </canvas> </body> </html> </code></pre> <p>Any help will be appreciated!</p>
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<javascript><canvas><rectangles><requestanimationframe>
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Simple Canvas Rectangle Interaction with Javascript
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