Created
September 16, 2011 13:15
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canvas play
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testing and learning canvas | |
up at ckt.alexjray.com |
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<!DOCTYPE html> | |
<html> | |
<head> | |
<script type="application/javascript"> | |
function drawBowtie(ctx, fillStyle) { | |
ctx.fillStyle = "rgba(200,200,200,0.3)"; | |
ctx.fillRect(-30,-30,60,60); | |
ctx.fillStyle = fillStyle; | |
ctx.globalAlpha = 1.0; | |
ctx.beginPath(); | |
ctx.moveTo(25,25); | |
ctx.lineTo(-25,-25); | |
ctx.lineTo(25,-25); | |
ctx.lineTo(-25,25); | |
ctx.closePath(); | |
ctx.fill(); | |
} | |
function dot(ctx) { | |
ctx.save(); | |
ctx.fillStyle = "black"; | |
ctx.fillRect(-2, -2, 4, 4); | |
ctx.restore(); | |
} | |
function draw() { | |
var canvas = document.getElementById("canvas"); | |
var ctx = canvas.getContext("2d"); | |
ctx.translate(45,45); // all other translates relative to this | |
ctx.save(); | |
drawBowtie(ctx, "red"); | |
dot(ctx); | |
ctx.restore(); | |
ctx.save(); | |
ctx.translate(85,0); | |
ctx.rotate(25 * Math.PI / 180); | |
drawBowtie(ctx, "green"); | |
dot(ctx); | |
ctx.restore(); | |
ctx.save(); | |
ctx.translate(0,85); | |
ctx.rotate(135 * Math.PI / 180); | |
drawBowtie(ctx, "blue"); | |
dot(ctx); | |
ctx.restore(); | |
ctx.save(); | |
ctx.translate(85,85); | |
ctx.rotate(90 * Math.PI / 180); | |
drawBowtie(ctx, "yellow"); | |
dot(ctx); | |
ctx.restore(); | |
} | |
</script> | |
</head> | |
<body onload="draw()"> | |
<canvas id="canvas" width="300" height="300"></canvas> | |
</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> | |
<script type="application/javascript"> | |
function draw() { | |
var canvas = document.getElementById("canvas"); | |
var ctx = canvas.getContext("2d"); | |
ctx.fillStyle = "red"; | |
ctx.beginPath(); | |
ctx.moveTo(30, 30); | |
ctx.lineTo(150,150); | |
ctx.bezierCurveTo(60,70,60,70,70,150); | |
ctx.lineTo(30,30); | |
ctx.fill(); | |
} | |
</script> | |
</head> | |
<body onload="draw()"> | |
<canvas id="canvas" width="300" height="300"></canvas> | |
</body> | |
</html> |
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