/*
 * CSE 142 Spring 2001
 * Homework 4, Part A
 * 
 * tron.h
 *
 * This header file contains symbolic constants and function prototypes for
 * those constants which are used in multiple files, and those functions which
 * are used in a file other than the one they're defined in.
 *
 */
 

/******************************************************************************
 * Symbolic constants
 ******************************************************************************/

#define TRUE	1
#define FALSE	0

/* Definitions of directions.  Observe the convention that an object
 * with a negative direction is stopped, facing in the direction you
 * would get if you removed the minus sign.
 * For example, if the player's direction is -LEFT, the player is
 * facing left but not moving. */
#define DOWN_LEFT	1
#define DOWN		2
#define DOWN_RIGHT	3
#define LEFT		4
#define RIGHT		6
#define UP_RIGHT	9
#define UP			8
#define UP_LEFT		7

/* Various object dimensions */
#define PLAYER_WIDTH		20
#define PLAYER_HEIGHT		20
#define PLAYER_DOT_RADIUS	2
#define ENEMY_WIDTH			20
#define ENEMY_HEIGHT		20
#define BULLET_WIDTH		5
#define BULLET_HEIGHT		5

/* Dimensions of the frame around the screen. */
#define BANNER_HEIGHT		25	/* Banner at top of screen */
#define BOUNDARY_WIDTH		5	/* Size of the "wall" around the playing field. */

/* Object status indicators */
#define BULLET_DEAD		0	/* Bullet is not in the air */
#define BULLET_ALIVE	1	/* Bullet is in the air */
#define ENEMY_DEAD		0
#define ENEMY_ALIVE		1

/* Game Status */
#define GAME_FLASH_SCREEN	4
#define GAME_LEVEL_START	0
#define GAME_PLAYING		1
#define GAME_PLAYER_DIED	5
#define GAME_LEVEL_END		2
#define GAME_OVER			3

/******************************************************************************
 * Function prototypes.  See the function definitions for 
 * descriptions of what they do.
 ******************************************************************************/
void moveObject(int *x, int *y, int width, int height, int direction, int speed);
void movePlayer(int *x, int *y, int playerFacing);
void moveEnemy(int *x, int *y, int playerX, int playerY);
void moveBullet(int *x, int *y, int *bulletStatus, int bulletFacing);

void drawBackground(void);
void drawMessage(char message[]);
void drawPlayer(int x, int y, int playerFacing);
void drawEnemy(int x, int y, int enemyStatus);
void drawBullet(int x, int y, int bulletStatus, int bulletFacing);
void drawBanner(int level, int numLives, int score);

int rectanglesOverlap(int x1, int y1, int w1, int h1,
					  int x2, int y2, int w2, int h2);
int rectangleHitByBullet(int rectX, int rectY, int width, int height,
						 int bulletX1, int bulletY1, int bulletX2, int bulletY2,
						 int bulletFacing);
int xComponent(int direction);
int yComponent(int direction);