new improved breakout

//
// breakout.c
//
// Computer Science 50
// Problem Set 3
//

// standard libraries
#define _XOPEN_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

// Stanford Portable Library
#include <spl/gevents.h>
#include <spl/gobjects.h>
#include <spl/gwindow.h>

// height and width of game's window in pixels
#define HEIGHT 600
#define WIDTH 400

// number of rows of bricks
#define ROWS 5

// number of columns of bricks
#define COLS 10

// radius of ball in pixels
#define RADIUS 10

// lives
#define LIVES 3

// prototypes
void initBricks(GWindow window);
GOval initBall(GWindow window);
GRect initPaddle(GWindow window);
GLabel initScoreboard(GWindow window);
void updateScoreboard(GWindow window, GLabel label, int points);
GObject detectCollision(GWindow window, GOval ball);

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;

    // velocity of balls
    double velocity = drand48()*rand();

    // keep playing until game over
    while (lives > 0 && bricks > 0)
    {
        // TODO
        int x = 185, y = 285;
      // updating score board..
        updateScoreboard(window, label, points);

      // start moving ball..
        move(ball, velocity, velocity);
        pause(10);

        GEvent event = getNextEvent(MOUSE_EVENT);
        if (event != NULL)
        {
            if (getEventType(event) == MOUSE_MOVED)
            {
                double x = getX(event) - getWidth(paddle)/2;
                setLocation(paddle, x, 550);
            }
        }

      // bounce back the ball if it bounce back to edges, top, brick, paddle, etc...
        if (getX(ball) + getWidth(ball) == getWidth(window))
        {
            velocity = -velocity;
        }
        else if (getX(ball) == 0)
        {
            velocity = -velocity;
        }
        else if (getY(ball) + getHeight(ball) > getHeight(window) - getHeight(paddle))
        {
            lives--;
            setLocation(ball, 193, 293);
            waitForClick();
        }
        else if (getY(ball) == 0)
        {
            velocity = -velocity;
        }

     // detect collision..
        GObject object = detectCollision(window, ball);
        if (object != NULL)
        {
            if (object == paddle)
            {
                velocity = -velocity;
            }
            else if (strcmp(getType(object), "GRect") == 0)
            {
                updateScoreboard(window, label, points);
                removeGWindow(window, "GRect");
                velocity = -velocity;
                points++;
                bricks--;
            }
            else if (strcmp(getType(label), "GLabel") == 0)
            {
                return 0;
            }
        }
    }

    if ((lives == 0) && (bricks > 0))
    {
        GLabel lost = newGLabel("Sorry!!\n\t\t\t\t YOU LOST :(");
        setFont(lost, "Arial-30");
        setLocation(lost, 185, 285);
        add(window, lost);
    }
    else if (bricks == 0)
    {
        GLabel lost = newGLabel("HURRAH!!!\n\t\t\t\t YOU WON :)");
        setFont(lost, "Arial-30");
        setLocation(lost, 185, 285);
        add(window, lost);
    }

    // wait for click before exiting
    waitForClick();

    // game over
    closeGWindow(window);
    return 0;
}

/**
 * Initializes window with a grid of bricks.
 */
void initBricks(GWindow window)
{
    // Making if and else conditions only for different colors in rows..
    int y=10;
    for (int i=0; i<ROWS; i++)
    {
        int x=10;
        if (i == 0)
        {
            for (int j=0; j<COLS; j++)
            {
                GRect bricks = newGRect(x, y, 30, 8);
                setFilled(bricks, true);
                setColor(bricks, "RED");
                add(window, bricks);
                x=x+38;
            }
            printf("\n");
        }
        else if (i == 1)
        {
            for (int j=0; j<COLS; j++)
            {
                GRect bricks = newGRect(x, y, 30, 8);
                setFilled(bricks, true);
                setColor(bricks, "BLUE");
                add(window, bricks);
                x=x+38;
            }
            printf("\n");
        }
        else if (i == 2)
        {
            for (int j=0; j<COLS; j++)
            {
                GRect bricks = newGRect(x, y, 30, 8);
                setFilled(bricks, true);
                setColor(bricks, "GREEN");
                add(window, bricks);
                x=x+38;
            }
            printf("\n");
        }
        else if (i == 3)
        {
            for (int j=0; j<COLS; j++)
            {
                GRect bricks = newGRect(x, y, 30, 8);
                setFilled(bricks, true);
                setColor(bricks, "YELLOW");
                add(window, bricks);
                x=x+38;
            }
            printf("\n");
        }
        else if (i == 4)
        {
            for (int j=0; j<COLS; j++)
            {
                GRect bricks = newGRect(x, y, 30, 8);
                setFilled(bricks, true);
                setColor(bricks, "BLUE");
                add(window, bricks);
                x=x+38;
            }
            printf("\n");
        }
        y=y+15;
    }
}

/**
 * Instantiates ball in center of window.  Returns ball.
 */
GOval initBall(GWindow window)
{
    GOval ball = newGOval(185, 285, RADIUS*2, RADIUS*2);
    setFilled(ball, true);
    setColor(ball, "BLACK");
    add(window, ball);
    return ball;
}

/**
 * Instantiates paddle in bottom-middle of window.
 */
GRect initPaddle(GWindow window)
{
    GRect paddle = newGRect(165,550,50,12);
    setFilled(paddle, true);
    setColor(paddle, "BLACK");
    add(window, paddle);
    return paddle;
}

/**
 * Instantiates, configures, and returns label for scoreboard.
 */
GLabel initScoreboard(GWindow window)
{
    GLabel label = newGLabel("");
    setFont(label, "SansSerif-40");
    double x= (getWidth(WIDTH) - getWidth(label))/2;
    double y= (getHeight(HEIGHT) + getFontAscent(label))/2;
    setLocation(label, x, y);
    return label;
}

/**
 * Updates scoreboard's label, keeping it centered in window.
 */
void updateScoreboard(GWindow window, GLabel label, int points)
{
    // update label
    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;
}