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heart.htm
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heart.htm
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<canvas id="tutorial" width="150" height="150"></canvas>
<script>
function drawShape(){
var canvas = document.getElementById('tutorial');
if (canvas.getContext){
var ctx = canvas.getContext('2d');
ctx.beginPath();
ctx.moveTo(75,40);
ctx.bezierCurveTo(75,37,70,25,50,25);
ctx.bezierCurveTo(20,25,20,62.5,20,62.5);
ctx.bezierCurveTo(20,80,40,102,75,120);
ctx.bezierCurveTo(110,102,130,80,130,62.5);
ctx.bezierCurveTo(130,62.5,130,25,100,25);
ctx.bezierCurveTo(85,25,75,37,75,40);
ctx.fillStyle= '#f00';
ctx.fill();
ctx.fillStyle= '#00f';
ctx.font= 'bold 18px 宋体';
ctx.strokeText('V Ybir Lbh'.replace(/[a-zA-Z]/g,function(c){return String.fromCharCode((c<="Z"?90:122)>=(c=c.charCodeAt(0)+13)?c:c-26);}), 24, 72);
} else {
document.write('该浏览器不支持，请更换其他浏览器，比如FF');
}
}
drawShape();
</script>
<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");
// note that all other translates are relative to this
// one
ctx.translate(45, 45);
ctx.save();
//ctx.translate(0, 0); // unnecessary
drawBowtie(ctx, "red");
dot(ctx);
ctx.restore();
ctx.save();
ctx.translate(85, 0);
ctx.rotate(45 * 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>