由浅入深学习Flash制作高射炮游戏(续)

上篇讲到了，可以设置一定角度发炮弹了！这时接着做，首先我们把炮弹去掉，只要炮弹出来舞台左、右和下我们就将该MC去掉。

　　代码：

Mouse.hide();
gravity = 2;
attachMovie("crosshair", "crosshair", 1);
attachMovie("tank", "tank", 2, {_x:230, _y:350});
crosshair.onEnterFrame = function() {
    this._x = _xmouse;
    this._y = _ymouse;
};
tank.onEnterFrame = function() {
    mousex = _xmouse-this._x;
    mousey = (_ymouse-this._y)*-1;
    angle = Math.atan(mousey/mousex)/(Math.PI/180);
    if (mousex<0) {
        angle += 180;
    }
    if (mousex>=0 && mousey<0) {
        angle += 360;
    }
    if (angle>160) {
        angle = 160;
    }
    if (angle<20) {
        angle = 20;
    }
    firepower = Math.sqrt(mousex*mousex+mousey*mousey);
    if (firepower>200) {
        firepower = 200;
    }
    this.cannon._rotation = angle*-1;
};
function onMouseDown() {
    angle = tank.cannon._rotation-1;
    start_ball_x = tank._x+48*Math.cos(angle*Math.PI/180);
    start_ball_y = tank._y+48*Math.sin(angle*Math.PI/180);
    cannonball_fired = attachMovie("cannonball", "cannonball_"+_root.getNextHighestDepth(), _root.getNextHighestDepth(), {_x:start_ball_x, _y:start_ball_y});
    cannonball_fired.dirx = Math.cos(angle*Math.PI/180)*firepower;
    cannonball_fired.diry = Math.sin(angle*Math.PI/180)*firepower;
    cannonball_fired.onEnterFrame = function() {
        this.diry += gravity;
        this._x += this.dirx/30;
        this._y += this.diry/30;
        if ((this._x<0) or (this._x>500) or (this._y>350)) {
            this.removeMovieClip();
        }
    };
}

　　效果（速度明显变快了）：

　　然后再继续完善，设置同一时间开火的次数。

Mouse.hide();

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