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I have been going through the project and I am kind of stuck in one step. When ever my ball bounces and breaks a brick, the scoreboard somehow doesn't add. I have gone through my code a few times and everything seems to make sense to me, but it's just not functioning. I think the error might be do to the ordering of my code but I just can't find the error. Can someone please help and see if they can spot anything wrong?? Thanks!!!!!

int main(void)
{
// seed pseudorandom number generator
srand48(time(NULL));

// instantiate window
GWindow window = newGWindow(WIDTH, HEIGHT);

// instantiate bricks


initBricks(window);

// instantiate ball, centered in middle of window
GOval ball = initBall(window);

// instantiate paddle, centered at bottom of window
GRect paddle = initPaddle(window);

// instantiate scoreboard, centered in middle of window, just above ball
GLabel label = initScoreboard(window);

// number of bricks initially
int bricks = COLS * ROWS;

// number of lives initially
int lives = LIVES;

// number of points initially
int points = 0;

// keep playing until game over
 double x_velocity = 1.5;
    double y_velocity = 1.0;

while (lives > 0 && bricks > 0)
{
    // TODO


    GEvent event = getNextEvent(MOUSE_EVENT);

    if (event != NULL)
    {
        if (getEventType(event) == MOUSE_MOVED)
        {
            double x = getX(event) - getWidth(paddle);
            double y = getY(event) - getWidth(paddle);
            setLocation(paddle,x,530);

        }
}




        move(ball, x_velocity,y_velocity);
        pause(10);

        if (getX(ball) + getWidth(ball) >= getWidth(window))
        {
        x_velocity = -x_velocity;
        }

        if (getX(ball) <=0)
        {
        x_velocity = -x_velocity;
        }

        if (getY(ball) <=0)
        {
        y_velocity = -y_velocity;
        }

        if (getY(ball) >= 600)
        {
        lives--;
        setLocation(ball,200,300);
        }

        GObject object = detectCollision(window,ball);

        if(object != NULL)
        {

        if (object == paddle)
        {
        y_velocity= -y_velocity;
        }

        else if (strcmp(getType(object),"GRect") ==0)
        {
        removeGWindow(window, object);
        y_velocity= -y_velocity;
        points++;
        bricks--;
        }
        }


}

// wait for click before exiting
waitForClick();

// game over
closeGWindow(window);
printf ("Please try again!");
return 0;
}

/**
* Initializes window with a grid of bricks.
*/
void initBricks(GWindow window)
{
// TODO

int setRectx = 5;
int setRecty = 37;

for ( int i = 0; i < ROWS; i++)
{

for ( int n = 0; n < COLS; n++)
{
GRect bricks = newGRect(setRectx,setRecty,36,10);
setColor(bricks,"BLUE");
setFilled(bricks,true);
setRectx = setRectx + 38;
add (window, bricks);
}
setRectx = 5;
setRecty = setRecty + 20;


}

}

/**
 * Instantiates ball in center of window.  Returns ball.
 */
GOval initBall(GWindow window)
{
// TODO

GOval ball = newGOval(200,300,20,20);

add (window, ball);


return ball;

}

/**
* Instantiates paddle in bottom-middle of window.
*/
GRect initPaddle(GWindow window) 
{
// TODO 

GRect paddle = newGRect(200,530,36,10);
setColor(paddle,"BLACK");
setFilled(paddle,true);

add(window, paddle);

return paddle;
}

/**
* Instantiates, configures, and returns label for scoreboard.
*/

GLabel initScoreboard(GWindow window)
{
 // TODO

GLabel label = newGLabel("0");
setFont (label, "SansSerif-36");
setColor(label,"BLACK");
setFilled(label,true);

setLocation(label, 200, 300);

add(window, label);
return label;
}

/**
* Updates scoreboard's label, keeping it centered in window.
*/
void updateScoreboard(GWindow window, GLabel label, int points)
{
// update label
points = 0;
char s[12];
sprintf(s, "%i", points);
setLabel(label, s);

// center label in window
double x = (getWidth(window) - getWidth(label)) / 2;
double y = (getHeight(window) - getHeight(label)) / 2;
setLocation(label, x, y);

}

/**
* Detects whether ball has collided with some object in window
* by checking the four corners of its bounding box (which are
* outside the ball's GOval, and so the ball can't collide with
* itself).  Returns object if so, else NULL.
*/
GObject detectCollision(GWindow window, GOval ball)
{
// ball's location
double x = getX(ball);
double y = getY(ball);

// for checking for collisions
GObject object;

// check for collision at ball's top-left corner
object = getGObjectAt(window, x, y);
if (object != NULL)
{
    return object;
}

// check for collision at ball's top-right corner
object = getGObjectAt(window, x + 2 * RADIUS, y);
if (object != NULL)
{
    return object;
}

// check for collision at ball's bottom-left corner
object = getGObjectAt(window, x, y + 2 * RADIUS);
if (object != NULL)
{
    return object;
}

// check for collision at ball's bottom-right corner
object = getGObjectAt(window, x + 2 * RADIUS, y + 2 * RADIUS);
if (object != NULL)
{
    return object;
}

// no collision
return NULL;
}
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You have two problems. First, you never actually call updateScoreboard() to display the updated score. Second, even if you do, there's this:

void updateScoreboard(GWindow window, GLabel label, int points)
{
// update label
points = 0;

That last line means that you will always display the score as zero.

If this answers your question, please click on the check mark to accept. Let's keep up on forum maintenance. ;-)

1
  • It worked! You have saved me again :D – Leon Nov 29 '15 at 20:35

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