Created
October 17, 2016 13:42
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ppmファイルを読み込みcanvas上に画像を表示する
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>sample</title> | |
| </head> | |
| <body> | |
| <form name="test"> | |
| <input type="file" id="selfile"><br> | |
| <textarea name="txt" rows="10" cols="50" readonly></textarea> | |
| </form> | |
| <canvas id="canvas" width="512" height="512"></canvas> | |
| <script> | |
| var obj1 = document.getElementById("selfile"); | |
| obj1.addEventListener("change", function(evt) { | |
| var file = evt.target.files; | |
| var reader = new FileReader(); | |
| reader.readAsText(file[0]); | |
| reader.onload = function(ev) { | |
| // document.test.txt.value = reader.result; | |
| var lines = reader.result.split("\n"); | |
| var len = lines.length; | |
| // document.test.txt.value = len; | |
| var i=0; | |
| while (/^#/.test(lines[i]) ) { i++; } | |
| var type = lines[i]; | |
| i++; | |
| while (/^#/.test(lines[i]) ) { i++; } | |
| var sizes = lines[i].split(/\s/); | |
| i++; | |
| while (/^#/.test(lines[i]) ) { i++; } | |
| var depth = lines[i].split(/\s/); | |
| i++; | |
| console.log("start reading."); | |
| console.log("file_length="+len); | |
| console.log("type="+type); | |
| console.log("sizes[0]="+sizes[0]); | |
| console.log("sizes[1]="+sizes[1]); | |
| console.log("depth="+depth); | |
| document.test.txt.value = "type=" + type + ", size=" + sizes[0] + ":" + sizes[1] + "\n"; | |
| var datas = []; | |
| for (; i<len; i++) { | |
| datas.push( lines[i] ); | |
| } | |
| console.log("done."); | |
| var canvas = document.getElementById('canvas'); | |
| if (canvas.getContext) { | |
| var ctx = canvas.getContext('2d'); | |
| console.log("get canvas context."); | |
| var cnt = 0; | |
| for (var y=0; y<sizes[1]; y++) { | |
| for (var x=0; x<sizes[0]; x++) { | |
| ctx.fillStyle = 'rgb('+datas[cnt]+','+datas[cnt+1]+','+datas[cnt+2]+')'; | |
| ctx.fillRect( x, y, 1, 1 ); | |
| cnt+=3; | |
| } | |
| } | |
| } | |
| console.log("finished."); | |
| } | |
| }, false); | |
| </script> | |
| </body> | |
| </html> |
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