<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>贝塞尔曲线绘制复选框</title>
<style>
body{
background-color:#eee;
}
#canvas{
background-color:#fff;
margin-left:10px;
margin-top:10px;
box-shadow:4px 4px 8px rgba(0,0,0,0.5);
}
</style>
</head>
<body>
<canvas id="canvas" width="800" height="600"></canvas>
<script>
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
ctx.fillStyle = 'cornflowerblue';
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.strokeStyle = 'yellow';
ctx.shadowColor = 'rgba(50,50,50,1)';
ctx.shadowOffsetX = 2;
ctx.shadowOffsetY = 2;
ctx.shadowBlur = 4;
ctx.lineWidth = 20;
ctx.lineCap = 'round';
ctx.beginPath();
ctx.moveTo(120.5,130);
ctx.quadraticCurveTo(150.8, 130, 160.6, 150.5);
ctx.quadraticCurveTo(190, 250, 210.5, 160.5);
ctx.quadraticCurveTo(240, 100.5, 290, 70.5);
ctx.stroke();
</script>
</body>
</html>
bessel.png
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