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Canvas Demos
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| html, body { margin: 0; } | |
| canvas { | |
| position: absolute; | |
| height: 100%; | |
| width: 100%; | |
| margin: 0; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <canvas></canvas> | |
| <script> | |
| var app = {}; | |
| app.init = function () { | |
| app.canvas = document.getElementsByTagName('canvas')[0]; | |
| app.ctx = app.canvas.getContext('2d'); | |
| app.x = 0; | |
| app.y = 0; | |
| app.resize(); | |
| window.setInterval(app.fall, 100); | |
| return app; | |
| }; | |
| app.resize = function () { | |
| var ctx = app.ctx; | |
| ctx.canvas.width = window.innerWidth; | |
| ctx.canvas.height = window.innerHeight; | |
| return app; | |
| }; | |
| app.draw = function () { | |
| var ctx = app.ctx; | |
| ctx.fillRect(0, 0, 50, 50); | |
| return app; | |
| }; | |
| app.fall = function () { | |
| var ctx = app.ctx, | |
| w = ctx.canvas.width, | |
| h = ctx.canvas.height; | |
| app.x = (w / 2) - 25; | |
| app.y += 5; | |
| if (app.y >= h) { app.y = 0; } | |
| ctx.clearRect(0, 0, w, h); | |
| ctx.translate(app.x, app.y); | |
| app.draw(); | |
| ctx.translate(-app.x, -app.y); | |
| return app; | |
| }; | |
| window.onresize = app.resize; | |
| app.init(); | |
| </script> | |
| </body> | |
| </html> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| html, body { margin: 0; } | |
| canvas { | |
| position: absolute; | |
| height: 100%; | |
| width: 100%; | |
| margin: 0; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <canvas></canvas> | |
| <script> | |
| var TAU = Math.PI * 2, | |
| app = {}; | |
| app.init = function () { | |
| app.canvas = document.getElementsByTagName('canvas')[0]; | |
| app.ctx = app.canvas.getContext('2d'); | |
| app.resize(); | |
| window.setInterval(app.rotate, 100); | |
| return app; | |
| }; | |
| app.resize = function () { | |
| var ctx = app.ctx; | |
| ctx.canvas.width = window.innerWidth; | |
| ctx.canvas.height = window.innerHeight; | |
| return app; | |
| }; | |
| app.draw = function () { | |
| var ctx = app.ctx, | |
| w = ctx.canvas.width, | |
| h = ctx.canvas.height, | |
| x = (w / 2) - 25, | |
| y = (h / 2) - 25; | |
| ctx.beginPath(); | |
| ctx.moveTo(x, y); | |
| x += 50; y += 0; | |
| ctx.lineTo(x, y); | |
| x += 0; y += 50; | |
| ctx.lineTo(x, y); | |
| x -= 50; y -= 0; | |
| ctx.lineTo(x, y); | |
| ctx.fill(); | |
| return app; | |
| }; | |
| app.rotate = function () { | |
| var ctx = app.ctx, | |
| w = ctx.canvas.width, | |
| h = ctx.canvas.height; | |
| ctx.clearRect(0, 0, w, h); | |
| ctx.translate(w/2, h/2); | |
| ctx.rotate(TAU / 360); | |
| ctx.translate(-w/2, -h/2); | |
| app.draw(); | |
| return app; | |
| }; | |
| window.onresize = app.resize; | |
| app.init(); | |
| </script> | |
| </body> | |
| </html> |
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