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利用canvas 制作多个小方块，并且让方块动起来的思路

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康师傅爱你呦
    171024

    利用canvas 制作多个小方块，并且让方块动起来的思路

    javascripthtml5
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    康师傅爱你呦
      171024

      <!DOCTYPE html>

      <html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<canvas id="c" width="500" height="600"></canvas>
<script>
    var canvas = document.getElementById('c');
    canvas.style.background = '#eee';
    var ctx = canvas.getContext('2d');

    function Block(x,y,wh,x1,y1,col) {
        this.c = ctx;
        this.x = x;
        this.y = y;
        this.w = wh;
        this.h = wh;
        this.x1 = x1;
        this.y1 = y1;
        this.col = col;
        this.time = 1000;
        this.id = 0;
        this.draw = function () {
            var _this = this;
            _this.id = setInterval(function () {
                _this.time -= 10;
                if (_this.time <=0 ){

                          clearInterval(_this.id);
                    _this.c.clearRect(_this.x,_this.y,_this.w,_this.h);
                    _this.w = _this.h = 0;
                }
                _this.x += _this.x1;
                _this.y += _this.y1;
                _this.c.fillStyle = _this.col,
                _this.c.clearRect(_this.x - _this.x1,_this.y-_this.y1,_this.w,_this.h);

                if (_this.x >= canvas.width - _this.w || _this.x <= 0){
                    _this.x1 = -_this.x1;
                }
                if (_this.y >= canvas.height - _this.h || _this.y <= 0){
                    _this.y1 = -_this.y1;
                }
                _this.c.fillRect(_this.x,_this.y, _this.w, _this.h);

            },10);
        };
    }
  var a = 1;
    canvas.onmousemove = function (e) {
        var x =  e.offsetX;
        var y =  e.offsetY;
        if (a++ % 6 == 0){
            var b = new Block(randomNumber(x-10,x+10),randomNumber(y-10,y+10),randomNumber(5,30),randomNumber(-5,5),randomNumber(-5,5),'rgb('+randomNumber(0,255)+','+randomNumber(0,255)+','+randomNumber(0,255)+')');
            b.draw();
        }
    }

          //随机数函数

    function randomNumber(a,b) {
        return parseInt(Math.random() * (b-a)) + a;
    }

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