学习轻松网-由浅入深学习Flash制作高射炮游戏

主要是利用Flash Actionscript一步一步学习Flash高射炮简单游戏的制作过程，最终效果只是一个简单的演示，如果你有兴趣可以继续深入学习！开篇前，先把所有的演示动画的源程序提供给大家：点击这里下载本教程中所有演示动画的源文件

第一步：首先简单的制作一个鼠标动画，绘制一个鼠标的图，自己定。然后选择第一帧输入下面代码：

Mouse.hide();
attachMovie("crosshair", "crosshair", 1);
crosshair.onEnterFrame = function() {
this._x = _xmouse;
this._y = _ymouse;
};

效果如下：

第二步：绘制一个坦克，分成两部分，如下面：

把下面的命名实例名为tank。代码如下：

效果（无角度限制）：

第三步：我这里设置转动的一定的角度。

效果如下：

然后是计算开火的目标：

开火的制作：

Mouse.hide();
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);
    attachMovie("cannonball", "cannonball", 3, {_x:start_ball_x, _y:start_ball_y});
}

效果如下：

开火出来炮弹：

Mouse.hide();
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._x += this.dirx/50;
        this._y += this.diry/50;
    };
}

效果如下：

最后再加以详细的限制一下炮弹：

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/50;
        this._y += this.diry/50;
    };
}

效果如下：

来源：网页教学网　作者：闪电儿