[代码]☆星星★烟花效果

2014-08-23 08:15:17 -0400

看看周围的效果

代码如下:

showStars : function(){
        var colors = ['#FF0000','#FF00FF','#00FF00','#00FFFF','#FFFF00','#FF0000','#FF00FF','#00FF00','#00FFFF','#FFFF00'];
        var n = cs = parseInt(Math.random() * colors.length / 2);
        var cc = parseInt(Math.random() * colors.length  / 2);
        var colorMode = parseInt(Math.random() * 2);
        var star = Math.round(Math.random()) == 1 ? "★" : "☆";
        this.r = 10;
        this.radius = Math.round(Math.random() * 30) + 60;
        this.num = Math.round(Math.random() * 5 + 5) * 2;
        this.angle = 180 / this.num * 2;
        
        for(var i=1; i<=this.num; i++){
            this.stars[i] = document.createElement("div");
            this.stars[i].innerHTML = star;
            this.stars[i].className = "star";
            if(colorMode == 1){
                this.stars[i].style.color = colors[n];
                if(++n > cs + cc)
                    n = cs;
            }else{
                this.stars[i].style.color = colors[parseInt(Math.random() * colors.length)];
            }
            this.sky.appendChild(this.stars[i]);
        }
    },
    moveStars : function(){
        var self = this;
        if(this.r < this.radius){
            var p = this.step2 - parseInt(this.r / this.radius * 5);
            p = p < 1 ? 1 : p;
            this.r += p;
            p = parseInt(this.r / this.radius * 100);
            for(var i=1; i<=this.num; i++){
                this.stars[i].style.left = this.x - Math.round(this.r * Math.sin(Math.PI - (Math.PI / 180 * this.angle * i))) + "px";
                this.stars[i].style.top = this.y - Math.round(this.r * Math.cos(Math.PI - (Math.PI / 180 * this.angle * i))) + "px";
                this.stars[i].style.fontSize = 4 + p/10 + "px";
                this.setOpacity(this.stars[i], p);
            }
            setTimeout(function(){self.moveStars();}, this.delay);
        }else{
            setTimeout(function(){self.hideStars();}, 200 * Math.random());
        }
    },
    initBezier : function(){
        var coeff_x = [];
         var coeff_y = [];
        
        this.points = [];
        this.t = 0;
        this.delt = 1.0 / this.max;
        this.cur = 1;
        var a = parseInt(Math.random() * 5) * 90;
        coeff_x[0] = this.x;
        coeff_y[0] = this.y;
        for(var i=1; i<=this.num; i++){
            coeff_x[1] = this.x + Math.sin(Math.PI - (Math.PI / 180 * this.angle * i)) * this.radius/2;
            coeff_y[1] = this.y + Math.cos(Math.PI - (Math.PI / 180 * this.angle * i)) * this.radius/2;
            coeff_x[2] = this.x + Math.sin(Math.PI - (Math.PI / 180 * (a-this.angle * i))) * this.radius;
            coeff_y[2] = this.y + Math.cos(Math.PI - (Math.PI / 180 * (a-this.angle * i))) * this.radius;
            this.points[(i-1)*2] = coeff_x.slice(0);
            this.points[(i-1)*2+1] = coeff_y.slice(0);
        }
    },
    moveStars2 : function(){
        var self = this;
        if(this.cur < this.max){
            this.t += this.delt;
            this.cur++;
            p = parseInt(this.cur / this.max * 100);
            for(var i=1; i<=this.num; i++){
                this.stars[i].style.left = this.getNextPoint(this.degree, this.points[(i-1)*2], this.t) + "px";
                this.stars[i].style.top = this.getNextPoint(this.degree, this.points[(i-1)*2+1], this.t) + "px";
                this.stars[i].style.fontSize = 4 + p/10 + "px";
                this.setOpacity(this.stars[i], p);
            }
            setTimeout(function(){self.moveStars2();}, this.delay);
        }else{
            setTimeout(function(){self.hideStars();}, 200 * Math.random());
        }
    },
    hideStars : function(){
        for(var i=1; i<=this.num; i++){
            this.sky.removeChild(this.stars[i]);
            this.stars[i] = null;
            if(this.points != null){
                delete this.points[(i-1)*2];
                delete this.points[(i-1)*2+1];
            }
        }
        if(this.points){
            delete this.points;
        }
        this.points = null;
        if(this.loop){
            this.play();
        }
    },
    fire : function(){
        this.hideBall();
        this.showStars();
        
        var effect = parseInt(Math.random() * 2) + 1;
        switch(effect){
            case 1:
                this.moveStars();
                break;
            case 2:
                this.initBezier();
                this.moveStars2();
                break;
        }
    },
    play : function(){
        this.init();
        this.showBall();
        this.moveBall();
    }
};

window.onload = function(){
    for(var i=0; i<5; i++)
        new Fireworks(document.body, true).play();
};
</script>

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