AS 1.0 FMX04 Tank game

1

I feel like this has been beaten dead, but I’m looking for a simple project to do for my physics class, so I figured I’d try my hand at this, but I can’t get the boundaries to work, and I’m unsure of how to stop the ball at the point. Here’s what I have so far, although I don’t believe it’s coded very well. (I based it off of some college assignment.)


// set variables for gravity and boundaries
cannon.vel= 10;
gravity = 2
topedge = -300
bottomedge = 300
rightedge = 550
leftedge = 0

cannon.onEnterFrame = function(){
  //code that will happen each frame
  //rotate cannon with left, right arrow keys

  if(Key.isDown(Key.RIGHT)){
    cannon._rotation += 1;
	angle.text = cannon._rotation
  } // end if

  if (Key.isDown(Key.LEFT)){
    cannon._rotation -= 1;
	angle.text = cannon._rotation
  } // end if  

  if (Key.isDown(Key.UP)){
    cannon.vel += 1;
	velocity.text = cannon.vel
  } // end if

  if (Key.isDown(Key.DOWN)){
    cannon.vel -= 1;
	velocity.text = cannon.vel
  } // end if

  if (Key.isDown(Key.SPACE)){
     //fire cannonball current angle and velocity
   
     //make a cannonball
     _root.attachMovie("cb","cb", 10);
     cb._x = cannon._x;
     cb._y = cannon._y;

     //offset by 90 degrees
     tempAngle = cannon._rotation -90;

     //convert to radians
     tempAngle = tempAngle / 180 * Math.PI;

     //get DX and DY (normalized: length is one)
     cb.dx = Math.cos(tempAngle) * cannon.vel;
     cb.dy = Math.sin(tempAngle) * cannon.vel + gravity;

    cb.onEnterFrame = function(){
      cb._x += cb.dx;
      cb._y += cb.dy;

      cb.dy += 1;
    } //end enterFrame
if (cb._x + _width/2 > rightedge){
		this.removeMovieClip();
	}
	if (cb._x - _width/2 < leftedge){
		this.removeMovieClip();
	}
	if (cb._y + _height/2 > bottomedge){
		cb.dy == 0;
	}
	if(cb._y - _height/2 < topedge){
		this.removeMovieClip();
	}
	
  } // end if
    

} // end enterFrame

// these fields update when the user changes the settings
angle.text = cannon._rotation;
velocity.text = cannon.vel;

I’ve also added the fla, so you can see how terribly I have it setup. I’m just trying to get the basic idea down, and then I will go back and make it look pretty. I’d also like to make the ground explode/disappear, when it comes into contact with it, but I’m extremely unsure of how to do that. If I’m going about this the wrong way, someone please let me know. I’ve already looked at the bit101.com gravity tutorial, and I’ve gone through senoculars tank fla file as well. Thanks for all the help.