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A simple and untested shape generator
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| <!DOCTYPE html> | ||
| <html lang="en"> | ||
| <head> | ||
| <meta charset="utf-8"> | ||
| <title>Get approximate polar equation for given image</title> | ||
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | ||
| <meta name="description" content=""> | ||
| <meta name="author" content=""> | ||
| <!-- Le styles --> | ||
| <link href="//netdna.bootstrapcdn.com/bootstrap/2.2.2/css/bootstrap.min.css" rel="stylesheet"> | ||
| <link href="//netdna.bootstrapcdn.com/bootstrap/2.2.2/css/bootstrap-responsive.min.css" rel="stylesheet"> | ||
| <link href="//fonts.googleapis.com/css?family=Finger+Paint" id="link-webfont" rel="stylesheet"> | ||
| <script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script> | ||
| <script src="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/2.2.2/bootstrap.min.js"></script> | ||
| <script> | ||
| var img, url; | ||
|
|
||
| window.onload = function() { | ||
| // DOM File object selected | ||
| var file = document.getElementById('file').files[0]; | ||
|
|
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| if (file) run(); | ||
| } | ||
|
|
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| function run() { | ||
| // DOM File object selected | ||
| var file = document.getElementById('file').files[0]; | ||
|
|
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| url = window.URL.createObjectURL(file); | ||
| img = new Image(); | ||
| img.src = url; | ||
|
|
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| img.onload = readPixels; | ||
| } | ||
|
|
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| function readPixels() { | ||
| window.URL.revokeObjectURL(url); | ||
|
|
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| var canvas = document.createElement('canvas'); | ||
| canvas.width = img.width; | ||
| canvas.height = img.height; | ||
|
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| document.body.appendChild(canvas); | ||
|
|
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| var ctx = canvas.getContext('2d'); | ||
| ctx.drawImage(img, 0, 0, img.width, img.height); | ||
|
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| var imageData = ctx.getImageData(0, 0, canvas.width, canvas.height); | ||
| var mask = new Uint8Array(imageData.data.length / 4); | ||
| var width = canvas.width; | ||
| var height = canvas.height; | ||
| for (var i = 0; i < imageData.data.length; i++) { | ||
| if (i % 4 === 3) { | ||
| mask[(i - 3) / 4] = imageData.data[i]; | ||
| imageData.data[i] = imageData.data[i] * 7 / 8 + 32; | ||
| continue; | ||
| } | ||
| imageData.data[i] = 0; | ||
| } | ||
|
|
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| var o = [(img.width / 2) | 0, (img.height / 2) | 0]; | ||
| var d = window.d = []; | ||
|
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| imageData.data[(o[1] * width + o[0]) * 4] = 254; | ||
|
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| for (var theta = 0; theta < 2 * Math.PI; theta += 0.01) { | ||
| var dx = 1 * Math.cos(theta); | ||
| var dy = - 1 * Math.sin(theta); | ||
| var i = 0; | ||
|
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| var x = o[0]; | ||
| var y = o[1]; | ||
| var intX = x; | ||
| var intY = y; | ||
| while (true) { | ||
| x += dx; | ||
| y += dy; | ||
|
|
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| intX = x | 0; | ||
| intY = y | 0; | ||
|
|
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| if (intY < 0 || intY > canvas.height || intX < 0 || intX > width) { | ||
| break; | ||
| } | ||
|
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| imageData.data[(intY * width + intX) * 4 + 1] = 254; | ||
| imageData.data[(intY * width + intX) * 4] = | ||
| (imageData.data[(intY * width + intX) * 4 + 3] === 32) ? 255: 128; | ||
|
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| if (imageData.data[(intY * width + intX) * 4 + 3] === 32) { | ||
| d.push(i); | ||
| break; | ||
| } else { | ||
| i++; | ||
| } | ||
| } | ||
| } | ||
|
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| ctx.putImageData(imageData, 0, 0); | ||
|
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| var max = d.reduce(function(prev, curr) { | ||
| return Math.max(prev, curr); | ||
| }); | ||
|
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| var resultText = | ||
| 'function(theta) {\n' + | ||
| ' var max = ' + max + ';\n' + | ||
| ' var leng = ' + JSON.stringify(d) + ';\n\n' + | ||
| ' return leng[(theta / (2 * Math.PI)) * leng.length | 0] / max;\n' + | ||
| '}\n'; | ||
|
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| var result = document.getElementById('result'); | ||
| result.textContent = resultText; | ||
| } | ||
| </script> | ||
| </head> | ||
| <body> | ||
| <div class="container"> | ||
| <p class="lead">Get approximate polar equation for given image.</p> | ||
| <p> | ||
| Please select a black-white image below. | ||
| The black part shall be centered and it will be the shape to trace. | ||
| You would have to manually save, edit the code if you want any additional processing. | ||
| </p> | ||
| <form> | ||
| <input type="file" id="file" class="input-large" onchange="run()"> | ||
| </form> | ||
| <pre id="result"></pre> | ||
| </div> | ||
| </body> |