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intelligent-snake
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intelligent-snake/isnake.c

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/*
* Intelligent SNAKE
*
* Description: A simple snake clone written in C and SDL
* Author: Kevin MacMartin
* E-Mail: prurigro@gmail.com
*
* This project is licensed under the the MIT License (MIT):
*
* Copyright (c) 2014 Kevin MacMartin
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* This projected is licensed under the terms of the MIT license
*
*/
#include <stdio.h>
#include <stdbool.h>
#include <time.h>
#include <SDL/SDL.h>
#include <SDL/SDL_ttf.h>
// TITLE OF THE WINDOW
#define GAMENAME "Intelligent Snake"
// FONT AND FONTSIZE
#define DEFAULT_FONT_FILE "DroidSans-Bold.ttf"
#define DEFAULT_FONT_SIZE 22
// HEIGHT AND WIDTH OF EACH TILE
#define TILEWIDTH 20
#define TILEHEIGHT 20
// MIN+MAX+DEFAULT TILE ROWS AND COLUMNS
#define MIN_TILESWIDE 30
#define MIN_TILESHIGH 20
#define MAX_TILESWIDE 80
#define MAX_TILESHIGH 50
#define DEFAULT_TILESWIDE 50
#define DEFAULT_TILESHIGH 30
// MIN+MAX+DEFAULT SNAKESPEED
#define MIN_SNAKESPEED 1
#define MAX_SNAKESPEED 9
#define DEFAULT_SNAKESPEED 1
// SNAKE LENGTH (+1 FOR BUFFER)
#define MIN_SNAKELENGTH 4
#define MAX_SNAKELENGTH 36
#define DEFAULT_SNAKELENGTH 4
// NUMBER OF NPCs (# OF BLOCKS + 1 FOR FOOD)
#define MIN_NPCCOUNT 1
#define MAX_NPCCOUNT 41
#define DEFAULT_NPCCOUNT 21
// AMOUNT OF FOOD EATEN BEFORE SNAKESPEED INCREASES
#define ACCEL_FREQ 3
// WHETHER TO DISPLAY COMMANDLINE OUTPUT DURING GAMEPLAY
#define CONSOLE_OUTPUT true
// CONSTANT VALUES
const int colourFood[3] = { 255, 0, 0 }; // Bright Red
const int colourHead[3] = { 215, 95, 95 }; // Red
const int colourBody[3] = { 135, 215, 255 }; // Blue
const int colourTail[3] = { 255, 215, 135 }; // Yellow
const int colourBlock[3] = { 234, 234, 234 }; // White
const int colourTiles[3] = { 38, 38, 38 }; // Dark Grey
const int colourBackground[3] = { 48, 48, 48 }; // Light Grey
const int colourTextGameOver[3] = { 234, 234, 234 }; // White
const int colourTextLabel[3] = { 215, 95, 95 }; // Red
const int colourTextData[3] = { 135, 215, 255 }; // Blue
// ENUMERATIONS FOR MORE READABLE CODE
enum direction { Up, Down, Left, Right }; // Movement directions
enum gameParams { QuitGame, TilesHigh, TilesWide, NPCCount, SnakeSpeed, SnakeLength, SnakeDirection, SnakeScore, RenderSizeMultiplier };
// GAME FUNCTIONS
void gameLoop(SDL_Surface* screen, SDL_Rect** ppTiles, int** ppSprites, int (*gameParameters)[9], SDL_Event* event);
void moveSnake(SDL_Surface* screen, SDL_Rect** ppTiles, int** ppSprites, int (*gameParameters)[9], enum direction newDirection);
bool collisionDetect(SDL_Surface* screen, SDL_Rect** ppTiles, int** ppSprites, int (*gameParameters)[9], enum direction newDirection);
void collisionDetectFood(SDL_Surface* screen, SDL_Rect** ppTiles, int** ppSprites, int (*gameParameters)[9]);
bool gameEventPoll(SDL_Surface* screen, SDL_Rect** ppTiles, int** ppSprites, int (*gameParameters)[9], SDL_Event* event);
bool scrollSnake(SDL_Surface* screen, SDL_Rect** ppTiles, int** ppSprites, int (*gameParameters)[9]);
void updateSnake(SDL_Surface* screen, SDL_Rect** ppTiles, int** ppSprites, int (*gameParameters)[9]);
void loadNPCs(SDL_Surface* screen, SDL_Rect** ppTiles, int** ppSprites, int (*gameParameters)[9]);
void randomLocation(int** ppSprites, int (*gameParameters)[9], int* location[2]);
void drawText(SDL_Surface* screen, char* string, int size, int x, int y, SDL_Colour colour);
void updateRect(SDL_Surface* screen, SDL_Rect** ppTiles, int position[2], const int colour[3]);
// COMMANDLINE FUNCTIONS
void configureGame(int argc, char** args, int (*gameParameters)[9]);
void printHelpMenu(char filename[]);
void printErrorHelp(char filename[]);
// MAIN LOOP
int main(int argc, char* args[]) {
int x, y, gameParameters[9];
int** ppSprites = NULL;
int* pSprites = NULL;
SDL_Surface* screen = NULL;
SDL_Rect** ppTiles = NULL;
SDL_Rect* pTiles = NULL;
SDL_Event event;
// START RANDOM SEED TO HELP MAKE RANDOM NUMBERS MORE RANDOM
srand(time(NULL));
// CONFIGURE GAME SETTINGS USING DEFAULTS AND USER INPUT
configureGame(argc, args, &gameParameters);
// INITIALIZE SDL
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER) != 0) {
fprintf(stderr, "\nUnable to initialize SDL: %s\n", SDL_GetError());
exit(EXIT_FAILURE);
}
atexit(SDL_Quit);
// INITIALIZE SDL_ttf
if (TTF_Init() != 0) {
fprintf(stderr, "\nUnable to initialize SDL: %s\n", SDL_GetError());
exit(EXIT_FAILURE);
}
atexit(TTF_Quit);
// INITIALIZE THE MAIN SURFACE
if ((screen = SDL_SetVideoMode((TILEWIDTH * gameParameters[TilesWide] * gameParameters[RenderSizeMultiplier]), ((TILEHEIGHT * gameParameters[TilesHigh]) + 35) * gameParameters[RenderSizeMultiplier], 32, SDL_HWSURFACE | SDL_DOUBLEBUF | SDL_ANYFORMAT)) == NULL) {
fprintf(stderr, "\nUnable to initialize SDL: %s\n", SDL_GetError());
exit(EXIT_FAILURE);
}
// SET THE INPUT QUEUE TO IGNORE INPUT VIA MOUSE MOVEMENT
SDL_EventState(SDL_MOUSEMOTION, SDL_IGNORE);
// SET WINDOW TITLE
SDL_WM_SetCaption(GAMENAME, NULL);
// SET BACKGROUND COLOUR
SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, colourBackground[0], colourBackground[1], colourBackground[2]));
while (gameParameters[QuitGame] == 0) {
// INIT TILES ARRAY
pTiles = malloc(gameParameters[TilesWide] * sizeof(SDL_Rect));
ppTiles = malloc(gameParameters[TilesHigh] * sizeof(SDL_Rect*));
for (x = 0; x < gameParameters[TilesHigh]; x++) {
ppTiles[x] = malloc(gameParameters[TilesWide] * sizeof(SDL_Rect));
}
for (x = 0; x < gameParameters[TilesHigh]; x++) {
for (y = 0; y < gameParameters[TilesWide]; y++) {
ppTiles[x][y].w = TILEWIDTH * gameParameters[RenderSizeMultiplier] - (TILEWIDTH * gameParameters[RenderSizeMultiplier] / 10);
ppTiles[x][y].h = TILEHEIGHT * gameParameters[RenderSizeMultiplier] - (TILEHEIGHT * gameParameters[RenderSizeMultiplier] / 10);
ppTiles[x][y].x = ((ppTiles[x][y].w + (TILEWIDTH * gameParameters[RenderSizeMultiplier] / 10)) * y);
ppTiles[x][y].y = ((ppTiles[x][y].h + (TILEHEIGHT * gameParameters[RenderSizeMultiplier] / 10)) * x);
SDL_FillRect(screen, &ppTiles[x][y], SDL_MapRGB(screen->format, colourTiles[0], colourTiles[1], colourTiles[2]));
}
}
// INIT SPRITES ARRAY
pSprites = malloc(2 * sizeof(int));
ppSprites = malloc((gameParameters[NPCCount] + MAX_SNAKELENGTH) * sizeof(int*)); // The array is defined by the snake's maximum size so it can grow during gameplay
for (x = 0; x < gameParameters[NPCCount] + MAX_SNAKELENGTH; x++) {
ppSprites[x] = malloc(2 * sizeof(int));
ppSprites[x][0] = 0;
ppSprites[x][1] = 0;
}
// SET SNAKE START POSITION
for (x = gameParameters[NPCCount]; x < gameParameters[NPCCount] + gameParameters[SnakeLength]; x++) {
ppSprites[x][0] = 3;
ppSprites[x][1] = (3 + gameParameters[NPCCount] + gameParameters[SnakeLength] - DEFAULT_SNAKELENGTH + 2 - x);
}
// SET NPC LOCATIONS
for (x = 0; x < gameParameters[NPCCount]; x++) {
randomLocation(ppSprites, &gameParameters, &(ppSprites)[x]);
}
// GAME LOOP
gameLoop(screen, ppTiles, ppSprites, &gameParameters, &event);
// FREE MEMORY AND RESET POINTERS
free(ppTiles);
free(ppSprites);
ppSprites = NULL;
pSprites = NULL;
// RESET GAME SETTINGS USING DEFAULTS AND USER INPUT
if (gameParameters[QuitGame] == 0) {
configureGame(argc, args, &gameParameters);
}
}
// FREEING THE SCREEN SURFACE BEFORE EXITING
SDL_FreeSurface(screen);
// EXIT THE PROGRAM
exit(EXIT_SUCCESS);
}
// GAME LOOP
void gameLoop(SDL_Surface* screen, SDL_Rect** ppTiles, int** ppSprites, int (*gameParameters)[9], SDL_Event* event) {
SDL_Colour SDL_ColourBackground = { colourBackground[0], colourBackground[1], colourBackground[2] };
SDL_Colour SDL_ColourTextLabel = { colourTextLabel[0], colourTextLabel[1], colourTextLabel[2] };
SDL_Colour SDL_ColourTextData = { colourTextData[0], colourTextData[1], colourTextData[2] };
SDL_Colour SDL_ColourTextGameOver = { colourTextGameOver[0], colourTextGameOver[1], colourTextGameOver[2] };
int scoreLabelPosition[2] = { 15 * (*gameParameters)[RenderSizeMultiplier], ((TILEHEIGHT * (*gameParameters)[TilesHigh]) + 4) * (*gameParameters)[RenderSizeMultiplier] };
int scoreDataPosition[2] = { 95 * (*gameParameters)[RenderSizeMultiplier], ((TILEHEIGHT * (*gameParameters)[TilesHigh]) + 4) * (*gameParameters)[RenderSizeMultiplier] };
int speedLabelPosition[2] = { ((TILEWIDTH * (*gameParameters)[TilesWide]) - 100) * (*gameParameters)[RenderSizeMultiplier], ((TILEHEIGHT * (*gameParameters)[TilesHigh]) + 4) * (*gameParameters)[RenderSizeMultiplier] };
int speedDataPosition[2] = { ((TILEWIDTH * (*gameParameters)[TilesWide]) - 25) * (*gameParameters)[RenderSizeMultiplier], ((TILEHEIGHT * (*gameParameters)[TilesHigh]) + 4) * (*gameParameters)[RenderSizeMultiplier] };
int gameOverMsgPosition[5] = { ((TILEWIDTH * ((*gameParameters)[TilesWide] / 2)) - 147) * (*gameParameters)[RenderSizeMultiplier], ((TILEWIDTH * ((*gameParameters)[TilesWide] / 2)) - 50) * (*gameParameters)[RenderSizeMultiplier], ((TILEWIDTH * ((*gameParameters)[TilesWide] / 2)) + 61) * (*gameParameters)[RenderSizeMultiplier], ((TILEWIDTH * ((*gameParameters)[TilesWide] / 2)) + 82) * (*gameParameters)[RenderSizeMultiplier], ((TILEHEIGHT * (*gameParameters)[TilesHigh]) + 9) * (*gameParameters)[RenderSizeMultiplier] };
char* gameOverMsg[4] = { "GAME OVER", "SPACE to RESTART", " or ", "ESC to QUIT" };
char tempString[2][3] = { "-1", "-1" };
// LOAD BLOCKS AND FOOD
loadNPCs(screen, ppTiles, ppSprites, gameParameters);
// DRAW LABELS FOR SCORE AND SPEED RESPECTIVELY
drawText(screen, "SCORE", DEFAULT_FONT_SIZE * (*gameParameters)[RenderSizeMultiplier], scoreLabelPosition[0], scoreLabelPosition[1], SDL_ColourTextLabel);
drawText(screen, "SPEED", DEFAULT_FONT_SIZE * (*gameParameters)[RenderSizeMultiplier], speedLabelPosition[0], speedLabelPosition[1], SDL_ColourTextLabel);
// LOOP UNTIL GAME IS FINISHED
while (1) {
// UPDATE THE SNAKE'S SCORE WHEN IT CHANGES
if (atoi(tempString[0]) != (*gameParameters)[SnakeScore]) {
if (atoi(tempString[0]) != -1) {
drawText(screen, tempString[0], DEFAULT_FONT_SIZE * (*gameParameters)[RenderSizeMultiplier], scoreDataPosition[0], scoreDataPosition[1], SDL_ColourBackground);
}
sprintf(tempString[0], "%d", (*gameParameters)[SnakeScore]);
drawText(screen, tempString[0], DEFAULT_FONT_SIZE * (*gameParameters)[RenderSizeMultiplier], scoreDataPosition[0], scoreDataPosition[1], SDL_ColourTextData);
}
// UPDATE THE SNAKE'S SPEED WHEN IT CHANGES
if (atoi(tempString[1]) != (*gameParameters)[SnakeSpeed]) {
if (atoi(tempString[1]) != -1) {
drawText(screen, tempString[1], DEFAULT_FONT_SIZE * (*gameParameters)[RenderSizeMultiplier], speedDataPosition[0], speedDataPosition[1], SDL_ColourBackground);
}
sprintf(tempString[1], "%d", (*gameParameters)[SnakeSpeed]);
drawText(screen, tempString[1], DEFAULT_FONT_SIZE * (*gameParameters)[RenderSizeMultiplier], speedDataPosition[0], speedDataPosition[1], SDL_ColourTextData);
}
if (gameEventPoll(screen, ppTiles, ppSprites, gameParameters, event) == false) {
break;
}
updateSnake(screen, ppTiles, ppSprites, gameParameters);
SDL_Flip(screen);
SDL_Delay(250 / ((*gameParameters)[SnakeSpeed] + 3));
if (scrollSnake(screen, ppTiles, ppSprites, gameParameters) == false) {
break;
}
updateSnake(screen, ppTiles, ppSprites, gameParameters);
SDL_Flip(screen);
SDL_Delay(250 / ((*gameParameters)[SnakeSpeed] + 3));
if (gameEventPoll(screen, ppTiles, ppSprites, gameParameters, event) == false) {
break;
}
updateSnake(screen, ppTiles, ppSprites, gameParameters);
SDL_Flip(screen);
}
// DISPLAY GAME OVER MESSAGE AND WAIT FOR INPUT
if ((*gameParameters)[QuitGame] == 0) {
// DISPLAY GAMEOVER MESSAGES
drawText(screen, gameOverMsg[0], (DEFAULT_FONT_SIZE - 7) * (*gameParameters)[RenderSizeMultiplier], gameOverMsgPosition[0], gameOverMsgPosition[4], SDL_ColourTextGameOver);
drawText(screen, gameOverMsg[1], (DEFAULT_FONT_SIZE - 9) * (*gameParameters)[RenderSizeMultiplier], gameOverMsgPosition[1], gameOverMsgPosition[4], SDL_ColourTextData);
drawText(screen, gameOverMsg[2], (DEFAULT_FONT_SIZE - 9) * (*gameParameters)[RenderSizeMultiplier], gameOverMsgPosition[2], gameOverMsgPosition[4], SDL_ColourTextGameOver);
drawText(screen, gameOverMsg[3], (DEFAULT_FONT_SIZE - 9) * (*gameParameters)[RenderSizeMultiplier], gameOverMsgPosition[3], gameOverMsgPosition[4], SDL_ColourTextData);
SDL_Flip(screen);
// WAIT A MOMENT TO ENSURE INPUT FROM THE GAME ISN'T CAUGHT
SDL_Delay(250 / ((*gameParameters)[SnakeSpeed] + 3));
// CAPTURE SDL_QUIT TO EXIT, ESCAPE TO EXIT, OR SPACEBAR TO RESTART
while (1) {
if (SDL_PollEvent(event)) {
if ((*event).type == SDL_QUIT) {
(*gameParameters)[QuitGame] = 1;
break;
} else if ((*event).type == SDL_KEYDOWN) {
if (((*event).key.keysym.sym == SDLK_ESCAPE) || ((*event).key.keysym.sym == SDLK_q)) {
(*gameParameters)[QuitGame] = 1;
break;
} else if (((*event).key.keysym.sym == SDLK_SPACE) || ((*event).key.keysym.sym == SDLK_RETURN)) {
break;
}
}
}
}
drawText(screen, gameOverMsg[0], (DEFAULT_FONT_SIZE - 7) * (*gameParameters)[RenderSizeMultiplier], gameOverMsgPosition[0], gameOverMsgPosition[4], SDL_ColourBackground);
drawText(screen, gameOverMsg[1], (DEFAULT_FONT_SIZE - 9) * (*gameParameters)[RenderSizeMultiplier], gameOverMsgPosition[1], gameOverMsgPosition[4], SDL_ColourBackground);
drawText(screen, gameOverMsg[2], (DEFAULT_FONT_SIZE - 9) * (*gameParameters)[RenderSizeMultiplier], gameOverMsgPosition[2], gameOverMsgPosition[4], SDL_ColourBackground);
drawText(screen, gameOverMsg[3], (DEFAULT_FONT_SIZE - 9) * (*gameParameters)[RenderSizeMultiplier], gameOverMsgPosition[3], gameOverMsgPosition[4], SDL_ColourBackground);
SDL_Flip(screen);
}
drawText(screen, "SCORE", DEFAULT_FONT_SIZE * (*gameParameters)[RenderSizeMultiplier], scoreLabelPosition[0], scoreLabelPosition[1], SDL_ColourBackground);
drawText(screen, "SPEED", DEFAULT_FONT_SIZE * (*gameParameters)[RenderSizeMultiplier], speedLabelPosition[0], speedLabelPosition[1], SDL_ColourBackground);
if (atoi(tempString[0]) != -1) {
drawText(screen, tempString[0], DEFAULT_FONT_SIZE * (*gameParameters)[RenderSizeMultiplier], scoreDataPosition[0], scoreDataPosition[1], SDL_ColourBackground);
}
if (atoi(tempString[1]) != -1) {
drawText(screen, tempString[1], DEFAULT_FONT_SIZE * (*gameParameters)[RenderSizeMultiplier], speedDataPosition[0], speedDataPosition[1], SDL_ColourBackground);
}
}
// MOVES THE SNAKE IN THE DESIRED DIRECTION
void moveSnake(SDL_Surface* screen, SDL_Rect** ppTiles, int** ppSprites, int (*gameParameters)[9], enum direction newDirection) {
int x;
// MOVEMENT
for (x = (*gameParameters)[NPCCount] + (*gameParameters)[SnakeLength] - 1; x >= (*gameParameters)[NPCCount]; x--) {
if (x == (*gameParameters)[NPCCount]) {
// MOVE THE HEAD OF THE SNAKE TO THE NEW DIRECTION
switch (newDirection) {
case Up:
ppSprites[x][0] = ppSprites[x][0] - 1;
(*gameParameters)[SnakeDirection] = 0;
break;
case Down:
ppSprites[x][0] = ppSprites[x][0] + 1;
(*gameParameters)[SnakeDirection] = 1;
break;
case Left:
ppSprites[x][1] = ppSprites[x][1] - 1;
(*gameParameters)[SnakeDirection] = 2;
break;
case Right:
ppSprites[x][1] = ppSprites[x][1] + 1;
(*gameParameters)[SnakeDirection] = 3;
break;
}
} else {
// MOVE THE BODY/TAIL OF THE SNAKE TO THE PIECE AHEAD OF IT
ppSprites[x][0] = ppSprites[x - 1][0];
ppSprites[x][1] = ppSprites[x - 1][1];
}
}
}
// DETECT+HANDLE WHEN THE SNAKE COLLIDES WITH WALLS, BLOCKS, ITSELF OR FOOD
bool collisionDetect(SDL_Surface* screen, SDL_Rect** ppTiles, int** ppSprites, int (*gameParameters)[9], enum direction newDirection) {
int x;
switch (newDirection) {
case Up:
for (x = 0; x < (*gameParameters)[NPCCount] + (*gameParameters)[SnakeLength] - 2; ++x) {
if (((ppSprites[(*gameParameters)[NPCCount]][0] - 1) == ppSprites[x][0]) && (ppSprites[(*gameParameters)[NPCCount]][1] == ppSprites[x][1])) {
if (x == 0) {
collisionDetectFood(screen, ppTiles, ppSprites, gameParameters);
} else {
return false;
}
}
}
if ((ppSprites[(*gameParameters)[NPCCount]][0] - 1) < 0) {
return false;
}
moveSnake(screen, ppTiles, ppSprites, gameParameters, Up);
break;
case Down:
for (x = 0; x < (*gameParameters)[NPCCount] + (*gameParameters)[SnakeLength] - 2; ++x) {
if (((ppSprites[(*gameParameters)[NPCCount]][0] + 1) == ppSprites[x][0]) && (ppSprites[(*gameParameters)[NPCCount]][1] == ppSprites[x][1])) {
if (x == 0) {
collisionDetectFood(screen, ppTiles, ppSprites, gameParameters);
} else {
return false;
}
}
}
if ((ppSprites[(*gameParameters)[NPCCount]][0] + 1) >= (*gameParameters)[TilesHigh]) {
return false;
}
moveSnake(screen, ppTiles, ppSprites, gameParameters, Down);
break;
case Left:
for (x = 0; x < (*gameParameters)[NPCCount] + (*gameParameters)[SnakeLength] - 2; ++x) {
if (((ppSprites[(*gameParameters)[NPCCount]][1] - 1) == ppSprites[x][1]) && (ppSprites[(*gameParameters)[NPCCount]][0] == ppSprites[x][0])) {
if (x == 0) {
collisionDetectFood(screen, ppTiles, ppSprites, gameParameters);
} else {
return false;
}
}
}
if ((ppSprites[(*gameParameters)[NPCCount]][1] - 1) < 0) {
return false;
}
moveSnake(screen, ppTiles, ppSprites, gameParameters, Left);
break;
case Right:
for (x = 0; x < (*gameParameters)[NPCCount] + (*gameParameters)[SnakeLength] - 2; ++x) {
if (((ppSprites[(*gameParameters)[NPCCount]][1] + 1) == ppSprites[x][1]) && (ppSprites[(*gameParameters)[NPCCount]][0] == ppSprites[x][0])) {
if (x == 0) {
collisionDetectFood(screen, ppTiles, ppSprites, gameParameters);
} else {
return false;
}
}
}
if ((ppSprites[(*gameParameters)[NPCCount]][1] + 1) >= (*gameParameters)[TilesWide]) {
return false;
}
moveSnake(screen, ppTiles, ppSprites, gameParameters, Right);
break;
}
return true;
}
// HANDLES COLLISION WITH FOOD
void collisionDetectFood(SDL_Surface* screen, SDL_Rect** ppTiles, int** ppSprites, int (*gameParameters)[9]) {
// INCREASE THE SNAKE'S SIZE IF IT'S NOT ALREADY THE MAXIMUM
if ((*gameParameters)[SnakeLength] < MAX_SNAKELENGTH) {
(*gameParameters)[SnakeLength]++;
}
// INCREASE THE SNAKE'S SPEED WHEN THE SCORE IS DIVISIBLE BY ACCEL_FREQ
if ((((*gameParameters)[SnakeScore] % ACCEL_FREQ) == 0) && ((*gameParameters)[SnakeScore] != 0) && ((*gameParameters)[SnakeSpeed] < MAX_SNAKESPEED)) {
(*gameParameters)[SnakeSpeed]++;
}
// INCREASE THE SNAKE'S SCORE
(*gameParameters)[SnakeScore]++;
// SET FOOD PIECE IN NEW LOCATION
randomLocation(ppSprites, gameParameters, &(ppSprites)[0]);
updateRect(screen, ppTiles, ppSprites[0], colourFood);
SDL_Flip(screen);
}
// CAPTURES INPUT AND GENERATES APPROPRIATE RESPONSE
bool gameEventPoll(SDL_Surface* screen, SDL_Rect** ppTiles, int** ppSprites, int (*gameParameters)[9], SDL_Event* event) {
bool playerAlive = true;
if (SDL_PollEvent(event)) {
switch ((*event).type) {
case SDL_QUIT:
playerAlive = false;
(*gameParameters)[QuitGame] = 1;
break;
case SDL_KEYDOWN:
// WHEN KEY IS PRESSED, CHECK WHICH AND RESPOND ACCORDINGLY
switch ((*event).key.keysym.sym) {
case SDLK_UP:
case SDLK_w:
case SDLK_k:
if (((*gameParameters)[SnakeDirection] != Up) && ((*gameParameters)[SnakeDirection] != Down)) {
playerAlive = (collisionDetect(screen, ppTiles, ppSprites, gameParameters, Up));
}
break;
case SDLK_DOWN:
case SDLK_s:
case SDLK_j:
if (((*gameParameters)[SnakeDirection] != Down) && ((*gameParameters)[SnakeDirection] != Up)) {
playerAlive = (collisionDetect(screen, ppTiles, ppSprites, gameParameters, Down));
}
break;
case SDLK_LEFT:
case SDLK_a:
case SDLK_h:
if (((*gameParameters)[SnakeDirection] != Left) && ((*gameParameters)[SnakeDirection] != Right) && ((*gameParameters)[SnakeDirection] != -1)) {
playerAlive = (collisionDetect(screen, ppTiles, ppSprites, gameParameters, Left));
}
break;
case SDLK_RIGHT:
case SDLK_d:
case SDLK_l:
if (((*gameParameters)[SnakeDirection] != Right) && ((*gameParameters)[SnakeDirection] != Left)) {
playerAlive = (collisionDetect(screen, ppTiles, ppSprites, gameParameters, Right));
}
break;
case SDLK_ESCAPE:
case SDLK_q:
playerAlive = false;
(*gameParameters)[QuitGame] = 1;
break;
default:
break;
}
break;
default:
break;
}
}
return playerAlive;
}
// MOVES SNAKE AUTOMATICALLY IN WHICHEVER DIRECTION IT WENT LAST
bool scrollSnake(SDL_Surface* screen, SDL_Rect** ppTiles, int** ppSprites, int (*gameParameters)[9]) {
bool playerAlive = true;
switch ((*gameParameters)[SnakeDirection]) {
case Up:
playerAlive = (collisionDetect(screen, ppTiles, ppSprites, gameParameters, Up));
break;
case Down:
playerAlive = (collisionDetect(screen, ppTiles, ppSprites, gameParameters, Down));
break;
case Left:
playerAlive = (collisionDetect(screen, ppTiles, ppSprites, gameParameters, Left));
break;
case Right:
playerAlive = (collisionDetect(screen, ppTiles, ppSprites, gameParameters, Right));
break;
default:
break;
}
return playerAlive;
}
// REDRAW THE SNAKE BASED ON CURRENT VALUES
void updateSnake(SDL_Surface* screen, SDL_Rect** ppTiles, int** ppSprites, int (*gameParameters)[9]) {
int x;
for (x = (*gameParameters)[NPCCount]; x < (*gameParameters)[NPCCount] + (*gameParameters)[SnakeLength]; x++) {
if (x == (*gameParameters)[NPCCount]) {
updateRect(screen, ppTiles, ppSprites[x], colourHead);
} else if (x == ((*gameParameters)[NPCCount] + (*gameParameters)[SnakeLength] - 1)) {
updateRect(screen, ppTiles, ppSprites[x], colourTiles);
} else if (x == ((*gameParameters)[NPCCount] + (*gameParameters)[SnakeLength] - 2)) {
updateRect(screen, ppTiles, ppSprites[x], colourTail);
} else {
updateRect(screen, ppTiles, ppSprites[x], colourBody);
}
}
}
// DRAW NPCs BASED ON ON CURRENT VALUES
void loadNPCs(SDL_Surface* screen, SDL_Rect** ppTiles, int** ppSprites, int (*gameParameters)[9]) {
int x, startNPCs = 0;
for (x = startNPCs; x < (*gameParameters)[NPCCount]; x++) {
if (x == startNPCs) {
updateRect(screen, ppTiles, ppSprites[x], colourFood);
} else {
updateRect(screen, ppTiles, ppSprites[x], colourBlock);
}
}
}
// A HELPER FUNCTION TO RANDOMLY PLACE NPCs WITH SOME INTELLIGENCE
void randomLocation(int** ppSprites, int (*gameParameters)[9], int* location[2]) {
int x, randLocation[2];
bool isAcceptable = false;
while (!isAcceptable) {
isAcceptable = true;
randLocation[0] = (rand() % ((*gameParameters)[TilesHigh] - 2)) + 1;
randLocation[1] = (rand() % ((*gameParameters)[TilesWide] - 2)) + 1;
// DON'T LOAD NPCs ONTO SNAKE OR OTHER NPCs
for (x = 0; x < (*gameParameters)[NPCCount] + (*gameParameters)[SnakeLength]; ++x) {
if (((ppSprites[x][0]) == randLocation[0]) && ((ppSprites[x][1]) == randLocation[1])) {
isAcceptable = false;
}
}
// DON'T LOAD NPCs DIRECTLY NEXT TO THE SNAKE'S HEAD
if (((((ppSprites[(*gameParameters)[NPCCount]][0]) - 1) == randLocation[0]) && (((ppSprites[(*gameParameters)[NPCCount]][1])) == randLocation[1])) || // ABOVE THE SNAKE'S HEAD
((((ppSprites[(*gameParameters)[NPCCount]][0]) + 1) == randLocation[0]) && (((ppSprites[(*gameParameters)[NPCCount]][1])) == randLocation[1])) || // BELOW THE SNAKE'S HEAD
((((ppSprites[(*gameParameters)[NPCCount]][0])) == randLocation[0]) && (((ppSprites[(*gameParameters)[NPCCount]][1]) - 1) == randLocation[1])) || // LEFT OF THE SNAKE'S HEAD
((((ppSprites[(*gameParameters)[NPCCount]][0])) == randLocation[0]) && (((ppSprites[(*gameParameters)[NPCCount]][1]) + 1) == randLocation[1]))) { // RIGHT OF THE SNAKE'S HEAD
isAcceptable = false;
}
}
// SET THE GIVEN NPC'S LOCATION TO THE GENERATED COORDINATES
(*location)[0] = randLocation[0];
(*location)[1] = randLocation[1];
}
// DRAW TEXT WHEN REQUIRED
void drawText(SDL_Surface* screen, char* string, int size, int x, int y, SDL_Colour colour) {
SDL_Colour SDL_ColourBackground = { colourBackground[0], colourBackground[1], colourBackground[2] };
SDL_Rect coordinates = { x, y };
SDL_Surface *newString = NULL;
TTF_Font *font;
// LOAD THE FONT
font = TTF_OpenFont(DEFAULT_FONT_FILE, size);
if (!font) {
fprintf(stderr, "Error loading %s", DEFAULT_FONT_FILE);
}
newString = TTF_RenderText_Shaded(font, string, colour, SDL_ColourBackground);
SDL_BlitSurface(newString, NULL, screen, &coordinates);
TTF_CloseFont(font);
SDL_FreeSurface(newString);
}
// LOW LEVEL FUNCTION TO BE RUN BY HIGHER LEVEL ONES FOR UPDATING TILES
void updateRect(SDL_Surface* screen, SDL_Rect** ppTiles, int position[2], const int colour[3]) {
SDL_FillRect(screen, &ppTiles[position[0]][position[1]], SDL_MapRGB(screen->format, colour[0], colour[1], colour[2]));
}
// PARSES COMMANDLINE OPTIONS AND GENERATES APPROPRIATE RESPONSE
void configureGame(int argc, char** args, int (*gameParameters)[9]) {
int parsecount = 1;
// SET DEFAULT GAME PARAMETERS
(*gameParameters)[QuitGame] = 0;
(*gameParameters)[TilesWide] = DEFAULT_TILESWIDE;
(*gameParameters)[TilesHigh] = DEFAULT_TILESHIGH;
(*gameParameters)[NPCCount] = DEFAULT_NPCCOUNT;
(*gameParameters)[SnakeSpeed] = DEFAULT_SNAKESPEED;
(*gameParameters)[SnakeLength] = DEFAULT_SNAKELENGTH;
(*gameParameters)[SnakeDirection] = -1;
(*gameParameters)[SnakeScore] = 0;
(*gameParameters)[RenderSizeMultiplier] = 1;
// PARSE COMMANDLINE FOR SETTINGS
while (parsecount < argc) {
if (strcmp(args[parsecount], "-h") == 0) {
// HELP MENU
printHelpMenu(args[0]);
exit(EXIT_SUCCESS);
} else if (strcmp(args[parsecount], "-g") == 0) {
// RESOLUTION
if ((parsecount + 2) < argc) {
if (((atoi(args[parsecount + 1]) >= MIN_TILESWIDE) && (atoi(args[parsecount + 1]) <= MAX_TILESWIDE)) && ((atoi(args[parsecount + 2]) >= MIN_TILESHIGH) && (atoi(args[parsecount + 2]) <= MAX_TILESHIGH))) {
(*gameParameters)[TilesWide] = atoi(args[parsecount + 1]);
(*gameParameters)[TilesHigh] = atoi(args[parsecount + 2]);
parsecount = parsecount + 3;
} else {
printErrorHelp(args[0]);
exit(EXIT_FAILURE);
}
} else {
printErrorHelp(args[0]);
exit(EXIT_FAILURE);
}
} else if (strcmp(args[parsecount], "-b") == 0) {
// NUMBER OF BLOCKS
if ((parsecount + 1) < argc) {
if ((atoi(args[parsecount + 1]) >= (MIN_NPCCOUNT - 1)) && (atoi(args[parsecount + 1]) <= (MAX_NPCCOUNT - 1))) {
(*gameParameters)[NPCCount] = atoi(args[parsecount + 1]) + 1;
parsecount = parsecount + 2;
} else {
printErrorHelp(args[0]);
exit(EXIT_FAILURE);
}
} else {
printErrorHelp(args[0]);
exit(EXIT_FAILURE);
}
} else if (strcmp(args[parsecount], "-l") == 0) {
// SNAKE'S LENGTH
if ((parsecount + 1) < argc) {
if ((atoi(args[parsecount + 1]) >= (MIN_SNAKELENGTH - 1)) && (atoi(args[parsecount + 1]) <= (MAX_SNAKELENGTH - 1))) {
(*gameParameters)[SnakeLength] = atoi(args[parsecount + 1]) + 1;
parsecount = parsecount + 2;
} else {
printErrorHelp(args[0]);
exit(EXIT_FAILURE);
}
} else {
printErrorHelp(args[0]);
exit(EXIT_FAILURE);
}
} else if (strcmp(args[parsecount], "-s") == 0) {
// SNAKE'S SPEED
if ((parsecount + 1) < argc) {
if ((atoi(args[parsecount + 1]) >= MIN_SNAKESPEED) && (atoi(args[parsecount + 1]) <= MAX_SNAKESPEED)) {
(*gameParameters)[SnakeSpeed] = atoi(args[parsecount + 1]);
parsecount = parsecount + 2;
} else {
printErrorHelp(args[0]);
exit(EXIT_FAILURE);
}
} else {
printErrorHelp(args[0]);
exit(EXIT_FAILURE);
}
} else if (strcmp(args[parsecount], "-2") == 0) {
// DOUBLE RESOLUTION
(*gameParameters)[RenderSizeMultiplier] = 2;
parsecount++;
} else {
// FAIL IF ANYTHING ELSE
printErrorHelp(args[0]);
exit(EXIT_FAILURE);
}
}
}
// PRINT THE HELP MENU TO THE COMMANDLINE
void printHelpMenu(char filename[]) {
fprintf(stdout, " Usage: %s [options]\n", filename);
fprintf(stdout, " Options:\n");
fprintf(stdout, " -g [width] [height]\tSet the grid size: between [%d]x[%d] and [%d]x[%d] (DEFAULT: [%d]x[%d])\n", MIN_TILESWIDE, MIN_TILESHIGH, MAX_TILESWIDE, MAX_TILESHIGH, DEFAULT_TILESWIDE, DEFAULT_TILESHIGH);
fprintf(stdout, " -b [blocks]\t\tSet the number of blocks: between [%d] and [%d] (DEFAULT: [%d])\n", MIN_NPCCOUNT - 1, MAX_NPCCOUNT - 1, DEFAULT_NPCCOUNT - 1);
fprintf(stdout, " -l [length]\t\tSet the snake's starting length: between [%d] and [%d] (DEFAULT: [%d])\n", MIN_SNAKELENGTH - 1, MAX_SNAKELENGTH - 1, DEFAULT_SNAKELENGTH - 1);
fprintf(stdout, " -s [speed]\t\tSet the snake's starting speed: between [%d] and [%d] (DEFAULT: [%d])\n", MIN_SNAKESPEED, MAX_SNAKESPEED, DEFAULT_SNAKESPEED);
fprintf(stdout, " -2\t\t\tDouble the size the game renders at\n");
fprintf(stdout, " -h\t\t\tDisplay help information\n");
}
// DISPLAYS AN ERROR MESSAGE BEFORE CALLING THE HELP MENU FUNCTION
void printErrorHelp(char filename[]) {
fprintf(stderr, " Error: invalid input\n\n");
printHelpMenu(filename);
}
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