//

// breakout.c

//

// Computer Science 50

// Problem Set 4

//

// 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

// height and width of paddle in pixels

#define PADDLEH 30

#define PADDLEW 70

// 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 = drand48()*2;

double angle = drand48()*3;

while (lives > 0 && bricks > 0)

{

// check for mouse event

GEvent event = getNextEvent(MOUSE_EVENT);

// if we heard one

if (event != NULL)

{

// if the event was movement

if (getEventType(event) == MOUSE_MOVED)

{

double x = getX(event)-PADDLEW/2;

double y = HEIGHT - PADDLEH;

setLocation(paddle, x, y);

}

}

move(ball, velocity, angle);

GObject object = detectCollision(window, ball);

// bounce off right edge of window

if (getX(ball) + getWidth(ball) > 400)

{

velocity = -velocity;

}

// bounce off left edge of window

else if (getX(ball) <= 0)

{

velocity = -velocity;

}

// Dtects if the ball hit the paddle then reverses angle

else if(object == paddle)

{

angle = -angle;

}

//Detects if it hits the bottom of the screen

else if(getY(ball) + getHeight(ball) > HEIGHT)

{

removeGWindow(window, ball);

waitForClick();

ball = initBall(window);

lives -= 1;

}

else if (getY(ball) <= 0)

{

angle = -angle;

}

else if (strcmp(getType(object), "GRect") == 0)

{

angle = -angle;

removeGWindow(window, object);

initScoreboard(window);

updateScoreboard(window, label, points);

points += 1;

if(points == 50)

{

break;

}

}

// linger before moving again

pause(5);

}

// 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 < ROWS; i++)

{

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

{

GRect rect = newGRect(5 + (80*i), 5+(25*j) , 70, 20);

setFilled(rect, true);

setColor(rect, "GREEN");

add(window, rect);

}

}

}

/**

* Instantiates ball in center of window. Returns ball.

*/

GOval initBall(GWindow window)

{

GOval ball = newGOval(185, 285, 30, 30);

setColor(ball, "BLUE");

setFilled(ball, true);

add(window, ball);

return ball;

}

/**

* Instantiates paddle in bottom-middle of window.

*/

GRect initPaddle(GWindow window)

{

//GRect newGRect(double x, double y, double width, double height);

//void drawRect(GWindow gw, double x, double y, double width, double height);

double xStart = (WIDTH/2)-(PADDLEW /2);

double yStart = HEIGHT - PADDLEH;

GRect rect = newGRect(xStart, yStart , PADDLEW, PADDLEH);

setFilled(rect, true);

setColor(rect, "RED");

add(window, rect);

return rect;

}

/**

* 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];

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;

}