Created
October 21, 2010 15:36
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示範繪圖加上旋轉的效果
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| <!DOCTYPE html> | |
| <html lang="zh-TW"> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html; charset=utf8"> | |
| <style> | |
| div { | |
| background: #AACCEE; | |
| border: solid 1px #336699; | |
| margin: 10px; | |
| padding: 5px; | |
| border-radius: 5px; | |
| display: inline-block; | |
| text-align: center | |
| } | |
| canvas { | |
| cursor: pointer; | |
| } | |
| </style> | |
| <script src="js/jquery-1.4.2.min.js"></script> | |
| <script> | |
| $(document).ready(function() { | |
| var ctx = $('#canvas')[0].getContext('2d'); | |
| var drawing = false; | |
| var oldPos = [0,0]; | |
| function drawLine(oldPos, newPos) { | |
| ctx.save(); | |
| ctx.beginPath(); | |
| ctx.moveTo(oldPos[0], oldPos[1]); | |
| ctx.lineTo(newPos[0], newPos[1]); | |
| ctx.closePath; | |
| ctx.stroke(); | |
| ctx.restore(); | |
| } | |
| var seq = [ | |
| function(){ | |
| ctx.save(); | |
| drawLine([280,200],[360,280]); | |
| drawLine([360,200],[280,280]); | |
| }, | |
| function(){ | |
| ctx.fillRect(280,200,80,80); | |
| }, | |
| function(){ | |
| ctx.rotate(-Math.PI/18); | |
| drawLine([280,200],[360,280]); | |
| drawLine([360,200],[280,280]); | |
| }, | |
| function(){ | |
| ctx.rotate(Math.PI/18*2); | |
| drawLine([280,200],[360,280]); | |
| drawLine([360,200],[280,280]); | |
| }, | |
| function(){ | |
| ctx.rotate(-Math.PI/18*3); | |
| drawLine([280,200],[360,280]); | |
| drawLine([360,200],[280,280]); | |
| }, | |
| function(){ | |
| ctx.rotate(Math.PI/18*4); | |
| drawLine([280,200],[360,280]); | |
| drawLine([360,200],[280,280]); | |
| }, | |
| function(){ | |
| ctx.rotate(-Math.PI/18*5); | |
| drawLine([280,200],[360,280]); | |
| drawLine([360,200],[280,280]); | |
| }, | |
| function(){ | |
| ctx.rotate(Math.PI/18*6); | |
| drawLine([280,200],[360,280]); | |
| drawLine([360,200],[280,280]); | |
| }, | |
| function(){ | |
| ctx.rotate(Math.PI/18); | |
| drawLine([280,200],[360,280]); | |
| drawLine([360,200],[280,280]); | |
| }, | |
| function(){ | |
| ctx.rotate(Math.PI/18); | |
| drawLine([280,200],[360,280]); | |
| drawLine([360,200],[280,280]); | |
| }, | |
| function(){ | |
| ctx.restore(); | |
| ctx.rect(270,190,100,100); | |
| ctx.stroke(); | |
| } | |
| ]; | |
| var count = 0; | |
| var tid = setInterval(function(){ | |
| seq[count](); | |
| count++; | |
| if(count>=seq.length) { | |
| clearInterval(tid); | |
| } | |
| }, 1000); | |
| }); | |
| </script> | |
| </head> | |
| <body> | |
| <div id="container"><canvas id="canvas" width="640" height="480"></canvas></div> | |
| </body> | |
| </html> |
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