HTML5 Canvas径向渐变
对于CreateAdialGradient()方法，我们可以使用画布创建径向渐变。
它定义有两个虚构的圆圈，一个是起始圆圈，另一个是结束圆圈。
HTML5 Canvas径向渐变语法
var grad=context.createRadialGradient(startX, startY, startRadius, endX, endY, endRadius); grad.addColorStop(offset, color);
HTML5 Canvas径向渐变示例
<!DOCTYPE HTML>
<html>
<head>
<style>
body {
margin: 0px;
padding: 0px;
}
#myCanvas {
border: 1px solid #9C9898;
}
</style>
<script>
window.onload = function () {
var canvas = document.getElementById("myCanvas");
var context = canvas.getContext("2d");
context.beginPath();
context.moveTo(170, 80);
context.bezierCurveTo(140, 100, 140, 150, 230, 150);
context.bezierCurveTo(250, 180, 320, 180, 340, 150);
context.bezierCurveTo(420, 150, 420, 130, 390, 100);
context.bezierCurveTo(430, 40, 370, 30, 340, 50);
context.bezierCurveTo(320, 7, 240, 20, 220, 50);
context.bezierCurveTo(200, 5, 150, 20, 170, 80);
context.closePath();
var grad = context.createRadialGradient(238, 50, 10, 238, 50, 200);
grad.addColorStop(0, "yellow");
grad.addColorStop(1, "brown");
context.fillStyle = grad;
context.fill();
context.lineWidth = 5;
context.strokeStyle = "red";
context.stroke();
};
</script>
</head>
<body>
<canvas id="myCanvas" width="578" height="200"></canvas>
</body>
</html>
日期：2020-04-11 23:04:09 来源：oir作者：oir