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canvas-3linearGradient.html

2015-11-20 17:50 369 查看

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<canvas id="canvas" style="margin:0 auto;border:1px #ddd solid;">
The current browser does not support Canvas, can replace the browser a try!
</canvas>

<script>

window.onload = function(){
var canvas = document.getElementById('canvas');

canvas.width = 800;
canvas.height = 800;

if(canvas.getContext('2d')){
var context = canvas.getContext('2d');

// begin
var linearGrad = context.createLinearGradient(0,0,200,800);
linearGrad.addColorStop(0.0,'white');
linearGrad.addColorStop(0.25,'yellow');
linearGrad.addColorStop(0.5,'green');
linearGrad.addColorStop(0.75,'blue');
linearGrad.addColorStop(1.0,'black');
context.fillStyle = linearGrad;
context.fillRect(0,0,800,800)

}else{
alert('当前游览器不支持Canvas，请更换游览器后再试！');
}
}
</script>
</body>
<script>
/*总结
step 1
//修改xstart,ystart,xend,yend 改变渐变方向
//修改fillRect 改变渐变区域
var grd = context.creatLinearGradient(xstart,ystart,xend,yend)
step 2
//stop的值域[0,1]
grd.addColorStop(stop,color)
*/
</script>
</html>

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