Created
October 21, 2010 15:33
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做出可以用滑鼠隨意塗鴉的效果
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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(); | |
| } | |
| $('#canvas')[0].addEventListener('mousedown', function(e) { | |
| drawing = true; | |
| oldPos = [e.clientX-e.currentTarget.offsetLeft, e.clientY-e.currentTarget.offsetTop]; | |
| },false); | |
| $('#canvas')[0].addEventListener('mouseup', function(e) { | |
| drawing = false; | |
| },false); | |
| $('#canvas')[0].addEventListener('mousemove', function(e) { | |
| e.preventDefault(); | |
| e.stopPropagation(); | |
| if(drawing) { | |
| var newPos = [e.clientX-e.currentTarget.offsetLeft, e.clientY-e.currentTarget.offsetTop]; | |
| drawLine(oldPos, newPos); | |
| oldPos = newPos; | |
| } | |
| return false; | |
| },false); | |
| $('#container')[0].addEventListener('mousemove', function() { | |
| drawing = false; | |
| }); | |
| }); | |
| </script> | |
| </head> | |
| <body> | |
| <div id="container"><canvas id="canvas" width="640" height="480"></canvas></div><br> | |
| </body> | |
| </html> |
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