//

// breakout.c

//

// standard libraries

#define _XOPEN_SOURCE

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <time.h>

// Stanford Portable Library

#include "gevents.h"

#include "gobjects.h"

#include "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;

// keep playing until game over

double velocity= 2.0 + drand48() ;

double vely = 2.0;

updateScoreboard(window, label, points);

waitForClick();

while (lives > 0 && bricks > 0)

{

updateScoreboard(window, label, points);

GEvent event = getNextEvent(MOUSE_EVENT);

if (event != NULL)

{

if (getEventType(event) == MOUSE_MOVED)

{

double x = getX(event) - getWidth(paddle) / 2;

setLocation(paddle, x, getY(paddle));

}

}

move(ball, velocity, vely);

if (getX(ball) + getWidth(ball) >= getWidth(window))

{

velocity = -velocity;

}

else if (getX(ball) <= 0)

{

velocity = -velocity;

}

if( getY(ball) <= 0)

{

vely = -vely;

}

else if (getY(ball)+getWidth(ball) >= HEIGHT)

{

lives--;

setLocation(ball, (WIDTH/2)-10, HEIGHT/2);

waitForClick();

}

GObject obj = detectCollision(window, ball);

if(obj != NULL)

{

if(strcmp(getType(obj), "GRect")==0)

{

vely = -vely;

if(obj != paddle)

{

removeGWindow(window, obj);

bricks--;

points++;

}

}

}

pause(10);

}

// wait for click before exiting

waitForClick();

// game over

closeGWindow(window);

return 0;

}

/**

* Initializes window with a grid of bricks.

*/

void initBricks(GWindow window)

{

for(int i=0; i< 5; i++)

{

for(int j=0; j< 10; j++)

{

GRect brick = newGRect(0,0,35,10);

switch(i)

{

case 0:

{

setColor(brick,"RED");

break;

}

case 1:

{

setColor(brick,"GREEN");

break;

}

case 2:

{

setColor(brick,"YELLOW");

break;

}

case 3:

{

setColor(brick,"BLUE");

break;

}

case 4:

{

setColor(brick,"ORANGE");

break;

}

}

setFilled(brick, true);

setLocation(brick,(2.5) + 40*j,50 + (i*15) );

add(window,brick);

}

}

}

/**

* Instantiates ball in center of window. Returns ball.

*/

GOval initBall(GWindow window)

{

GOval ball = newGOval((WIDTH/2)-10, HEIGHT/2, 20, 20);

setColor(ball, "BLACK");

setFilled(ball, true);

add(window, ball);

return ball;

}

/**

* Instantiates paddle in bottom-middle of window.

*/

GRect initPaddle(GWindow window)

{

GRect paddle = newGRect((WIDTH/2) - 30 ,HEIGHT - 50 ,60 ,10);

add(window,paddle);

setColor(paddle,"BLACK");

setFilled(paddle, true);

return paddle;

}

/**

* Instantiates, configures, and returns label for scoreboard.

*/

GLabel initScoreboard(GWindow window)

{

GLabel label = newGLabel("");

setFont(label, "SansSerif-36");

add(window, label);

return label;

}

/**

* Updates scoreboard's label, keeping it centered in window.

*/

void updateScoreboard(GWindow window, GLabel label, int points)

{

// update label

char s[12];

char t[20] = "Score: ";

sprintf(s, "%i", points);

strcat(t,s);

setLabel(label, t);

// 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;

}