leaves.js - mozsearch

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Leaf = Utilities.createSubclass(Particle,

    function(stage)

        this.element = document.createElement("img");

        this.element.setAttribute("src", Stage.randomElementInArray(stage.images).src);

        stage.element.appendChild(this.element);

        Particle.call(this, stage);

    }, {

    sizeMinimum: 20,

    sizeRange: 40,

    reset: function()

        Particle.prototype.reset.call(this);

        this.element.style.width = this.size.x + "px";

        this.element.style.height = this.size.y + "px";

        this._opacity = .01;

        this._opacityRate = 0.02 * Stage.random(1, 6);

        this._position = new Point(Stage.random(0, this.maxPosition.x), Stage.random(-this.size.height, this.maxPosition.y));

        this._velocity = new Point(Stage.random(-6, -2), .1 * this.size.y + Stage.random(-1, 1));

},

    animate: function(timeDelta)

        this.rotater.next(timeDelta);

        this._position.x += this._velocity.x + 8 * this.stage.focusX;

        this._position.y += this._velocity.y;

        this._opacity += this._opacityRate;

        if (this._opacity > 1) {

            this._opacity = 1;

            this._opacityRate *= -1;

        } else if (this._opacity < 0 || this._position.y > this.stage.size.height)

            this.reset();

        if (this._position.x < -this.size.width || this._position.x > this.stage.size.width)

            this._position.x = this._position.x - Math.sign(this._position.x) * (this.size.width + this.stage.size.width);

        this.move();

},

    move: function()

        this.element.style.transform = "translate(" + this._position.x + "px, " + this._position.y + "px)" + this.rotater.rotateZ();

        this.element.style.opacity = this._opacity;

});