Bouncing a ball off a wall object

programming flash
1

Hi,

I have created a flash AS3 file with two movieclips. One is a ball (ball_mc) and a wall (wall_mc). The ball bounces around off the outer walls of the stage, in horizontal lines.

The ball also changes direction if it bounces off the wall. However its not bouncing off the wall in the right direction?

Could anyone help me with this?

My code looks like this:




var dx:Number=3; //the amount the ball will move horizontally each frame
var dy:Number=5; //the amount the ball will move vertically each frame


this.addEventListener(Event.ENTER_FRAME,moveBall); // call the function moveBall every frame

function moveBall(event:Event): void 
{
    ball_mc.x=ball_mc.x+dx; //the ball moves horizontally
    
    if(ball_mc.x>stage.stageWidth - ball_mc.width || ball_mc.x<0)
    //at either the right edge or left edge
        dx=dx* -1; //change horizontal direction
        
        ball_mc.y=ball_mc.y+dy; //the ball moves vertically
    
if(ball_mc.hitTestObject(wall_mc))
    {
        if(ball_mc.y > wall_mc.height - ball_mc.height || 
           ball_mc.y < wall_mc.y -ball_mc.height)
            {
                    
                
                    dy=dy* -1; 
            }
            if(ball_mc.x > wall_mc.width - ball_mc.width || 
               ball_mc.x < wall_mc.x - ball_mc.width)
            {
                   
                    dx=dx* -1; 
            }
        
    }


    if(ball_mc.y > stage.stageHeight - ball_mc.height || ball_mc.y < 0) 
    //at either the top or bottom edge
    
        dy=dy* -1; //change vertical direction
    
        

        
        
        
        

}