xangle <> 0

[CyberCarsten]

Hi!
How do I prevent my xangle variable from equaling 0.....

Here is some of my code:

int Game_Main(void *parms)
{

// check of user is trying to exit
if (KEY_DOWN(VK_ESCAPE))
    PostMessage(main_window_handle, WM_DESTROY,0,0);
// Move paddle left
if (KEY_DOWN(VK_LEFT)) {
    lkpress = true;
    if (paddle.x >5) {
        paddle.x = paddle.x -4;
        Move_BOB(&paddle);
    }
} else if(KEY_DOWN(VK_RIGHT)) {        // Move paddle right
    rkpress = true;
    if(paddle.x + paddle.width  < SCREEN_WIDTH) {
        paddle.x = paddle.x +4;
        Move_BOB(&paddle);
        
    }
}

// start the timing clock
Start_Clock();

// clear the drawing surface
DD_Fill_Surface(lpddsback, 0);

Draw_BOB(&paddle,lpddsback);
Draw_BOB(&ball,lpddsback);
for (int draw = 0; draw<28; draw++)
Draw_BOB(&box[draw],lpddsback);

ball.xv = xangle;
ball.yv = yangle;
Move_BOB(&ball);

//the ball is going outside the screen
if(ball.x <= 0) {
    lasthit = LAST_HIT_LEFT;
    xangle = -xangle;
}
if( ball.x >= SCREEN_WIDTH - ball.width ){
    lasthit = LAST_HIT_RIGHT;
    xangle = -xangle;
}

// the ball is going outside the screen
if(ball.y <= 0) {
    lasthit = LAST_HIT_TOP;
    
        yangle = -yangle;
    
    if(xangle <0){
        xangle = xangle;
    }
    if(xangle > 0){
        xangle = -xangle;
    }
}

if(ball.y > SCREEN_HEIGHT){
    
    yangle = -yangle;
}
// the ball has hit the paddle
if(Collision_BOBS(&ball,&paddle)){
    yangle=-yangle; // change direction
    lasthit = LAST_HIT_BOTTOM;
        
    // This collision detection determine where the ball hits the paddle and 
    // calculates a new direction

    if(ball.x == paddle.x && ball.y == paddle.height){
        if(lkpress){
            if(xangle > 0){
                xangle = -3.5;
                lkpress =false;
            }
            else if(xangle <0){
                xangle = 3.5;
                lkpress = false;
            }
        }
    }
        if(ball.x > paddle.x && paddle.x <=19){
            if(xangle >0){
            xangle = 2;
            }
            else if(xangle <0){
                xangle = -2;
            }
        
        }
        
        if(ball.x > paddle.x +19 && paddle.x <=38){
            if(xangle > 0){
            xangle = 1;
            }
            else if(xangle <0){
                xangle = -1;
            }
        }
        if(ball.x >= paddle.x +38 && paddle.x <=57){
            if(xangle > 0){
            xangle = 0.5;
            }
            else if(xangle < 0){
                xangle = -0.5;
            }
        }

        if(ball.x > paddle.x +57 && paddle.x <=76){
            if(xangle < 0){
            xangle = -0.5;
            }
            else if(xangle > 0){
                xangle = 0.5;
            }

        }
        if(ball.x > paddle.x +76 && paddle.x <=95){
            if(xangle <0){
            xangle =-1;
            }
            else if(xangle >0){
                xangle = 1;
            }

        }
        if(ball.x > paddle.x +95 && paddle.x <115){
            
            if(xangle <0){
            xangle = -2;
            }
            else if(xangle >0){
                xangle = 2;
            }
        }
        
        if(ball.x == paddle.x + paddle.width  && ball.y == paddle.height){
        if(rkpress){
            if(xangle < 0){
                xangle = -3.5;
                rkpress = false;
            }
            else if(xangle >0){
                xangle = 3.5;
                rkpress = false;
            }
        }
    }
        

}






// flip the surfaces
DD_Flip();


// sync to 10ish fps
Wait_Clock(10);

// Perform collision detection with the blocks
for(counter = 0; counter<28; counter++)
if(Collision_BOBS(&ball,&box[counter])){
    if(xangle < 0){
        xangle = xangle;
        
        
    }
    if(xangle > 0){
        xangle = -xangle;
        
    }
    if(xangle ==0){
        if(lasthit == LAST_HIT_LEFT){
            xangle=+rand()%2;
        }
        if(lasthit == LAST_HIT_RIGHT){
            xangle=-rand()%-2;
        }
    }

    if(yangle < 0){
        yangle = -yangle;
    }
    if(yangle > 0){
        yangle = yangle;
    }
}
    
// return success
return(1);

} // end Game_Main