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machinaut/bowtie.html

Created September 16, 2011 13:15
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canvas play
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readme
testing and learning canvas
up at ckt.alexjray.com
Raw
bowtie.html
<!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>
Raw
index.html
<!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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