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html5结合js写的动画实例

2011-11-10 23:18 573 查看

html5结合js写的动画，可复制以下代码，涉及浏览器兼容性问题，ie要ie9以上才可以

<!DOCTYPE HTML>
<html>
<head>
<title>Animation & Multiple Canvas Example</title>
<script>
// 水的画布
function drawWater() {
var canvasWater = document.getElementById("myWaterCanvas");
var contextWater = canvasWater.getContext("2d");
contextWater.globalAlpha = .50 ;
// 创建一个线性渐变的填充
var linearGrad = contextWater.createLinearGradient(0,0,400,400);
linearGrad.addColorStop(0, '#0000ff'); // sets the first color
linearGrad.addColorStop(.25, '#0099ff'); // sets the second color
linearGrad.addColorStop(.50, '#00ccff'); // sets the third color
linearGrad.addColorStop(.75, '#00ffff'); // sets the fourth color
contextWater.fillStyle = linearGrad;
contextWater.fillRect(0,0,400,400);
}

// 游泳者的画布
setInterval(drawSwimmer, 30);
var positionX = 0;
var positionY = 0;

function drawSwimmer(){
var canvasSwimmer = document.getElementById("mySwimmerCanvas");
var contextSwimmer = canvasSwimmer.getContext("2d");
contextSwimmer.clearRect(0,0,400,400);

if (positionX <30)
{
positionX += 1;
positionY += 1;
}
else
{
positionX = 0;
positionY = 0;
}

contextSwimmer.save();

// 绘制一个圆作为头部
var centerX = 200;
var centerY = 50;
var radius = 20;

contextSwimmer.beginPath();
contextSwimmer.arc(centerX, centerY+positionY,
radius, 0, 2 * Math.PI, false);

contextSwimmer.fillStyle = "#000000";
contextSwimmer.fill();
contextSwimmer.lineWidth = 5;

// 躯干部分
contextSwimmer.beginPath();
contextSwimmer.moveTo(200,70+positionY);
contextSwimmer.lineTo(200,175);
contextSwimmer.lineWidth = 10;
contextSwimmer.strokeStyle = "#000000";
contextSwimmer.lineCap = "round";
contextSwimmer.stroke();

// 画右边的手臂
contextSwimmer.beginPath();
contextSwimmer.moveTo(200, 100);
contextSwimmer.lineTo(175-positionX,140-positionY);
contextSwimmer.lineWidth = 10;
contextSwimmer.strokeStyle = "#000000";
contextSwimmer.lineCap = "round";
contextSwimmer.stroke();

// 画左边的手臂
contextSwimmer.beginPath();
contextSwimmer.moveTo(200, 100);
contextSwimmer.lineTo(225+positionX,140-positionY);
contextSwimmer.lineWidth = 10;
contextSwimmer.strokeStyle = "#000000";
contextSwimmer.lineCap = "round";
contextSwimmer.stroke();

// 画右边的腿
contextSwimmer.beginPath();
contextSwimmer.moveTo(200, 175);
contextSwimmer.lineTo(190-positionX,250-positionY);
contextSwimmer.lineWidth = 10;
contextSwimmer.strokeStyle = "#000000";
contextSwimmer.lineCap = "round";
contextSwimmer.stroke();

// 画左边的腿
contextSwimmer.beginPath();
contextSwimmer.moveTo(200, 175);
contextSwimmer.lineTo(210+positionX,250-positionY);
contextSwimmer.lineWidth = 10;
contextSwimmer.strokeStyle = "#000000";
contextSwimmer.lineCap = "round";
contextSwimmer.stroke();

contextSwimmer.restore();

};

</script>

</head>
<body onLoad="drawWater();">
<canvas id="myWaterCanvas" width="400" height="400" style="z-index: 2;
position:absolute;left:0px;top:0px;">
</canvas>
<canvas id="mySwimmerCanvas" width="400" height="400" style="z-index: 1;
position:absolute;left:0px;top:0px;">
</canvas>

</body>
</html>

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