Created
October 21, 2010 15:39
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簡單的影像繪製測試
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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() { | |
| document.ondragenter = function(e){e.preventDefault();} | |
| document.ondragover = function(e){e.preventDefault();} | |
| $('#canvas')[0].addEventListener('dragenter', function(e){ | |
| e.preventDefault(); | |
| e.effectAllowed = 'move'; | |
| },false); | |
| $('#canvas')[0].addEventListener('dragover', function(e){ | |
| e.preventDefault(); | |
| e.dataTransfer.dropEffect = 'move'; | |
| },false); | |
| $('#canvas')[0].addEventListener('drop', function(e){ | |
| e.preventDefault(); | |
| e.dataTransfer.dropEffect = 'move'; | |
| if(e.dataTransfer.types && e.dataTransfer.types.length>0) { | |
| var isFile = false; | |
| for(var i=0; i<e.dataTransfer.types.length; i++) { | |
| if(e.dataTransfer.types[i] === 'Files' && e.dataTransfer.files.length>0) isFile = true; | |
| } | |
| for(var i=0; i<e.dataTransfer.types.length; i++) { | |
| if(e.dataTransfer.types[i]==='Files') { | |
| if(e.dataTransfer.files.length>0) { | |
| for(var j=0; j<e.dataTransfer.files.length; j++) { | |
| switch(e.dataTransfer.files[j].type) { | |
| case 'image/jpeg': | |
| case 'image/gif': | |
| case 'image/png': | |
| case 'image/bmp': | |
| (function(blob){ | |
| var fileReader = new FileReader(); | |
| fileReader.onload = function() { | |
| var img = document.createElement('img'); | |
| img.src = this.result; | |
| setTimeout(function(){ | |
| var ctx = $('#canvas')[0].getContext('2d'); | |
| ctx.drawImage(img, 0, 0); | |
| },100); | |
| }; | |
| fileReader.readAsDataURL(blob); | |
| })(e.dataTransfer.files[j]); | |
| break; | |
| default: | |
| alert('Only image file allowed.\nIncluding: jpeg, png, gif and bmp.'); | |
| break; | |
| } | |
| } | |
| } | |
| } | |
| } | |
| } | |
| },false); | |
| }); | |
| </script> | |
| </head> | |
| <body> | |
| <div id="container"><canvas id="canvas" width="640" height="480"></canvas></div> | |
| </body> | |
| </html> |
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