zstest
/
circleColor.html

<!DOCTYPE html>
<html>
<head>
    <title>demo</title>
    <style type="text/css">
        body {
            margin:0; background:black;
        }
        #canvas {
            border:3px solid gray; box-shadow:0px 0px 2px 2px #D5D5D5; margin-left:100px; margin-top:50px;
        }
        #power {
            position:fixed; bottom:50px; right:50px;
        }
        #power a {
            color:green; text-decoration:none; display:inline-block; padding:20px; border:2px solid orange; box-shadow:0px 0px 2px 2px blue;
            font-size:30px;
        }
    </style>
</head>
<body>
<canvas id="canvas" width="500px" height="500px"></canvas>
<script type="text/javascript">
    var canvas = document.getElementById("canvas");
    var ctx = canvas.getContext("2d");
    var colorList = "abcdefABCDEF0123456789".split("");
    var colorListLength = colorList.length;
    var arcList = [];
    function createArc(attr) {
        ctx.beginPath();
        ctx.fillStyle = attr.color || "black";
        ctx.arc(attr.x, attr.y, attr.r, 0, Math.PI*2);
        ctx.closePath();
        ctx.fill();
    }
    function color() {
        var color = "#";
        for(var i=0; i<6; i++) {
            color += colorList[Math.round(Math.random()*colorListLength)];
        }
        return color;
    }
    function Arc() {
        this.count = 0;
        this.r = 5;
        this.x = Math.round(Math.random()*500);
        this.add = Math.round(Math.random()*5);
        this.limit = Math.round(Math.random()*100)
        this.mode = Math.round(Math.random());
        var _self = this;
        _self.run = function() {
            if(_self.r >= _self.limit) {
                _self.run = null;
                return;
            }
            _self.x += _self.add*(_self.mode == 1 ? 1 : -1);
            createArc({x: _self.x, y:Math.round(Math.random()*400), r: _self.r, color: color()});
            _self.r += 5;
            return _self;
        };
        return this;
    }
    var init_count = 150;
    var init_time = 0;
    var init = function() {
        init_time++;
        arcList.length = 0;
        for(var i=0; i<init_count; i++) {
            arcList.push(new Arc());
        }
    };
    var reInit = function() {
        var angle = Math.PI*2/init_count;
        for(var i=0; i<init_count; i++) {
            var _angle = i*angle;
            createArc({x: 250 + 250*Math.cos(_angle), y: 250 + 250*Math.sin(_angle), r: 5, color:color()});
            createArc({x: 250 + 200*Math.cos(_angle), y: 250 + 200*Math.sin(_angle), r: 5, color:color()});
            createArc({x: 250 + 150*Math.cos(_angle), y: 250 + 150*Math.sin(_angle), r: 5, color:color()});
            createArc({x: 250 + 100*Math.cos(_angle), y: 250 + 100*Math.sin(_angle), r: 5, color:color()});
        }
    };
    init();
    var globalInterval = setInterval(function() {
        ctx.clearRect(0, 0, 500, 500);
        var count = 0;
        for(var i=0; i<init_count; i++) {
            var arc = arcList[i];
            arc.run ? arc.run() : count++;
        }
        if(count == init_count) {
            if(init_time >= 2) {
                reInit();
                return;
            }
            init();
        }
    }, 100);
</script>
</body>
</html>