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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Icon</title> | |
| <style> | |
| body { | |
| width: 30em; | |
| margin: 0 auto; | |
| font-family: Consolas, Meiryo, monospace; | |
| } | |
| h1, a { | |
| color: #888; | |
| } | |
| h1::before { | |
| position: absolute; | |
| margin-left: -.75em; | |
| color: #ccc; | |
| content: '+'; | |
| } | |
| a { | |
| padding: .2em 0; | |
| border-bottom: 2px dotted #888; | |
| text-decoration: none; | |
| } | |
| a:hover { | |
| color: #555; | |
| background: #ccc; | |
| } | |
| canvas { | |
| display: block; | |
| margin: 1em 0; | |
| cursor: pointer; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <h1>icon.js</h1> | |
| <canvas id="cv" width="256" height="256"></canvas> | |
| <p>code: <a href="icon.js">icon.js</a></p> | |
| <script src="icon.js"></script> | |
| </body> | |
| </html> |
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| window.addEventListener('load', function main() { | |
| var cv, ctx; | |
| function randint(min, max) { | |
| if (typeof max === 'undefined') { | |
| max = min; | |
| min = 0; | |
| } | |
| return Math.floor(Math.random() * (max - min + 1) + min); | |
| } | |
| function color(r, g, b) { | |
| return 'rgb(' + [r, g, b].join(', ') + ')'; | |
| } | |
| function ig(x, d) { | |
| return x > d ? d : x; | |
| } | |
| function render(ctx, n) { | |
| var cv, width, height, x, y, w, h, mx, my; | |
| cv = ctx.canvas; | |
| width = cv.width; | |
| height = cv.height; | |
| ctx.fillStyle = color(255, 255, 255); | |
| ctx.fillRect(0, 0, width, height); | |
| ctx.fillStyle = color(0, 0, 0); | |
| w = width / n; | |
| h = height / n; | |
| for (x = 0; x < n; x++) { | |
| for (y = 0; y < n; y++) { | |
| mx = 255 * Math.abs(n - x) / n; | |
| my = 255 * Math.abs(n - y) / n; | |
| ctx.fillStyle = color( | |
| randint(ig(mx - 16, 255), ig(mx + 16, 255)), | |
| randint(ig(my - 16, 255), ig(my + 16, 255)), | |
| 96 | |
| ); | |
| ctx.fillRect(x * w, y * h, w, h); | |
| } | |
| } | |
| } | |
| cv = document.getElementById('cv'); | |
| ctx = ctx = cv.getContext('2d'); | |
| render(ctx, 32); | |
| cv.addEventListener('mousemove', render.bind(null, ctx, 32), false); | |
| cv.addEventListener('click', function () { | |
| window.open(cv.toDataURL()); | |
| }); | |
| }, false); |
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