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H5炫酷特效系列1——canvas满屏幕变换爱心示例

2017-07-29 12:59 323 查看

啥都不说，先上效果图，同志们觉得满意就继续看，不中意直接过。

效果为满屏幕的红心到处乱窜，红心自动变换大小和透明度，代码也不多，同志们直接复制就可以运行查看。

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>满屏幕红心</title>
<style type="text/css">
body{
margin: 0;
overflow: hidden;
background: #303035;
}
</style>
</head>
<body>
<canvas></canvas>
<div id="container" class="container"></div>

<script src="https://code.jquery.com/jquery-3.2.1.min.js" charset="utf-8"></script>
<script type="text/javascript">
var canvas = document.querySelector("canvas");
var ctx = canvas.getContext("2d");

var ww = window.innerWidth;
var wh = window.innerHeight;

var hearts = [];

function init(){
requestAnimationFrame(render);
canvas.width = ww;
canvas.height = wh;
for(var i = 0; i < 100; i++){
hearts.push(new Heart());
}
}

function Heart() {
this.x = Math.random() * ww;
this.y = Math.random() * wh;
this.opacity = (Math.random() * 0.5) + 0.5;
this.vel = {
x: (Math.random() - 0.5) * 4,
y: (Math.random() - 0.5) * 4
};
this.targetScale = (Math.random() * 0.15) + 0.02;
this.scale = this.targetScale * Math.random();
}

Heart.prototype.update = function(){
this.x += this.vel.x;
this.y += this.vel.y;

this.scale += (this.targetScale - this.scale) * 0.01;
if(this.x - this.width > ww || this.x + this.width < 0){
this.scale = 0;
this.x = Math.random() * ww;
}
if(this.y - this.height > wh || this.y + this.height < 0){
this.scale = 0;
this.y = Math.random() * wh;
}
this.width = 473.8 * this.scale;
this.height = 408.6 * this.scale;
}
Heart.prototype.draw = function(){
ctx.globalAlpha = this.opacity;
ctx.drawImage(heartImage, this.x - this.width * 0.5, this.y - this.height * 0.5,this.width, this.height);
}

function render(){
ctx.clearRect(0, 0, ww, wh);
// ctx.globalAlpha = 1;
// ctx.fillStyle = "rgba(255,255,255,0.3)";
// ctx.fillRect(0, 0, ww, wh);
for(var i=0; i<100; i++){
hearts[i].update();
hearts[i].draw();
}
requestAnimationFrame(render);
}

var heartImage = new Image();
heartImage.onload = init();
heartImage.src =  "data:image/svg+xml;base64,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";

window.addEventListener("resize",function(){
ww = window.innerWidth;
wh = window.innerHeight;
})

</script>
</body>
</html>

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标签： canvas svg 红心表白爱心

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