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October 1, 2015 01:17
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Fancy circles
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| var ctx; | |
| var x = 0; | |
| $(function() { | |
| ctx = $('#canvas')[0].getContext("2d"); | |
| return setInterval(draw, 10); | |
| }); | |
| function draw() { | |
| ctx.clearRect(0, 0, 600, 600); | |
| var x1 = x; | |
| var x2 = x + Math.PI * 2 / 3; | |
| var x3 = x + Math.PI * 4 / 3; | |
| var circleDeviation = 35; | |
| var figureDeviation = 100; | |
| var figureSpeed = x / 3.5; | |
| var figureLocationX = Math.sin(figureSpeed) * figureDeviation; | |
| var figureLocationY = Math.cos(figureSpeed) * figureDeviation; | |
| var radiusDeviation = 29; | |
| var radius = Math.sin(x) * radiusDeviation + 30; | |
| drawCircle(ctx, "rgba(255, 0, 0, .333)", | |
| Math.sin(x1) * circleDeviation + 200 + figureLocationX, | |
| Math.cos(x1) * circleDeviation + 200 + figureLocationY, | |
| radius | |
| ); | |
| drawCircle(ctx, "rgba(0, 255, 0, .333)", | |
| Math.sin(x2) * circleDeviation + 200 + figureLocationX, | |
| Math.cos(x2) * circleDeviation + 200 + figureLocationY, | |
| radius | |
| ); | |
| drawCircle(ctx, "rgba(0, 0, 255, .333)", | |
| Math.sin(x3) * circleDeviation + 200 + figureLocationX, | |
| Math.cos(x3) * circleDeviation + 200 + figureLocationY, | |
| radius | |
| ); | |
| x += 0.1; | |
| } | |
| function drawCircle(ctx, color, x, y, radius) { | |
| with (ctx) { | |
| fillStyle = color; | |
| beginPath(); | |
| arc(x, y, radius, 0, Math.PI*2, true); | |
| closePath(); | |
| fill(); | |
| } | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Fancy circles</title> | |
| <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script> | |
| <script src="circles.js"></script> | |
| </head> | |
| <body> | |
| <canvas id="canvas" width="500" height="500"></canvas> | |
| </body> | |
| </html> |
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