From 79fa249aa729e03b17991c3991f5bb090ffb6b61 Mon Sep 17 00:00:00 2001 From: Kai Stevenson Date: Sat, 4 Mar 2023 17:17:13 -0800 Subject: restructured project --- snake.c | 360 ---------------------------------------------------------------- 1 file changed, 360 deletions(-) delete mode 100644 snake.c (limited to 'snake.c') diff --git a/snake.c b/snake.c deleted file mode 100644 index 577c832..0000000 --- a/snake.c +++ /dev/null @@ -1,360 +0,0 @@ -#include -#include -#include -#include -#include /* handling ctrl-c */ -#include /* terminal size */ -#include /* argument parsing */ -#include /* time calculations */ - -#include "vector.h" -#include "snake.h" -#include "conio.h" -#include "colors.h" -#include "config.h" -#define UNUSED(x) (void)(x) - -/*** GLOBAL VARIABLES ***/ -volatile sig_atomic_t intCtrlC = 0; /* flag for ctrl-c interrupt */ -int score = 0; -int updateInterval = 300000000L; - -vectorp_t obstaclePositions; -vectorp_t snakePositions; -vector_t foodPos; -vector_t lastMoveDir; - -/* unsafe functions like printf cannot be called in async interrupt handler */ -void interrupt_handler(int sig) { - UNUSED(sig); - intCtrlC = 1; -} - -int main(int argc, char **argv) { - /* parsing arguments */ - char *last_flag = NULL; - int was_flag = 0; - for(int i = 1; i < argc; i++) { - if(strcmp("--version", argv[i]) == 0) { - printf("snake3, version 2.0\n"); - printf("Copyright 2023 Kai Stevenson\n"); - printf("Copyright 2023 Preston Pan\n"); - printf("This software was licensed under the MIT license;\n"); - printf("for more information, see the license file.\n"); - return 0; - } - else if(strcmp("--help", argv[i]) == 0) { - fprintf(stderr, "usage: snake3 [--version] [--help] [--size board_size] [--speed speed] [--obstacles obstacles]\n"); - return 1; - } - else if(strcmp("--size", argv[i]) == 0 || strcmp("--speed", argv[i]) == 0 || strcmp("--obstacles", argv[i]) == 0) { - last_flag = argv[i]; - was_flag = 1; - } - else if(was_flag) { - if(strcmp("--size", last_flag) == 0) { - boardSize = atoi(argv[i]); - if(boardSize < 3) { - fprintf(stderr, "%sboard size too small or argument invalid, please try again.%s\n", RED, COLOR_RESET); - return 1; - } - } - else if(strcmp("--speed", last_flag) == 0) { - speed = atoi(argv[i]); - if(speed <= 0) { - fprintf(stderr, "%sspeed level must be greater than zero and integer. Please try again.%s\n", RED, COLOR_RESET); - return 1; - } - else if(speed > 10) { - fprintf(stderr, "%sspeed must not be greater than ten. Please try again.%s\n", RED, COLOR_RESET); - return 1; - } - } - else if(strcmp("--obstacles", last_flag) == 0) { - obstacles = atoi(argv[i]); - if(obstacles < 0) { - fprintf(stderr, "%sobstacle count cannot be negative. Please try again.%s\n", RED, COLOR_RESET); - return 1; - } - } - was_flag = 0; - } - else { - printf("usage: snake3 [--version] [--help]\n"); - return 1; - } - } - /* check argument compatibility */ - if((obstacles * obstacleSize) * 3 > pow(boardSize, 2)) { - fprintf(stderr, "%stoo many obstacles. Please try again.%s\n", RED, COLOR_RESET); - exit(1); - } - /* get terminal size */ - struct winsize win; - ioctl(fileno(stdout), TIOCGWINSZ, &win); - int width = (int)(win.ws_col); - int height = (int)(win.ws_row); - /* multiplied by 2 to account for the fact that the board is twice as wide as high */ - int smallestAxis = width / 2 < height ? width / 2 : height; - boardSize = smallestAxis < boardSize ? smallestAxis : boardSize; - /* hide cursor */ - printf("\033[?25l"); - /* make a new thread handling interrupts */ - signal(SIGINT, interrupt_handler); - /* init values */ - snakePositions = init_vectorp(malloc(5 * sizeof(vector_t)), 5); - snakePositions.vectors[0] = init_vector(5, 5); - snakePositions.vectors[1] = init_vector(5, 4); - snakePositions.vectors[2] = init_vector(5, 3); - snakePositions.vectors[3] = init_vector(4, 3); - snakePositions.vectors[4] = init_vector(3, 3); - foodPos = init_vector(7, 9); - lastMoveDir = init_vector(0, 1); - int opc = (int)pow(obstacleSize, 2) * obstacles; - obstaclePositions = init_vectorp(malloc(opc * sizeof(vector_t)), opc); - srand(time(NULL)); - /* place the obstacles */ - /* TODO: make this less recursive */ - int opi = 0; - for(int i = 0; i < obstacles; i++) { - while(1) { - vector_t basePos = init_vector((rand() % (boardSize - (obstacleSize - 1))), (rand() % (boardSize - (obstacleSize - 1)))); - /* if obstacle overlaps snake, try again */ - uint8 overlap = 0; - for(int r = 0; r < obstacleSize; r++) { - for(int c = 0; c < obstacleSize; c++) { - vector_t voxelPos = init_vector(basePos.mx + c, basePos.my + r); - for(int j = 0; j < snakePositions.length; j++) { - if((snakePositions.vectors[j].mx == voxelPos.mx) && (snakePositions.vectors[j].my == voxelPos.my)) { - overlap = 1; - } - } - if(foodPos.mx == voxelPos.mx && foodPos.my == voxelPos.my) { - overlap = 1; - } - } - } - if(overlap) { - continue; - } - for(int r = 0; r < obstacleSize; r++) { - for(int c = 0; c < obstacleSize; c++) { - vector_t voxelPos = init_vector(basePos.mx + c, basePos.my + r); - obstaclePositions.vectors[opi] = voxelPos; - opi++; - } - } - break; - } - } - /* clear the screen so as to prevent artifacting */ - printf("\033[2J"); - /* prepare the pointers which will be used to communicate with the input getting thread */ - volatile int* lastInput = calloc(1, sizeof(int)); - int* cancellationToken = calloc(1, sizeof(int)); - /* and the wrapper struct */ - threadArg_t threadArg; - threadArg.returnV = (void*)lastInput; - threadArg.cancellationToken = cancellationToken; - /* create listener thread */ - pthread_t listenerID; - pthread_create(&listenerID, NULL, get_dir_loop, &threadArg); - /* main game logic loop */ - while(1) { - /* handle ctrl-c interrupt */ - if(intCtrlC) { - goto EXIT; - } - - /* first, draw the current state of the board */ - draw_board(); - /* handle player input; - * wait for the specified interval */ - struct timespec time; - time.tv_sec = 0; - time.tv_nsec = round((float)updateInterval / ((float)speed / 3)); - nanosleep(&time, NULL); - /* read the most recent value emitted by the listener */ - vector_t dir = parse_dir(*(char*)lastInput); - /* if the player inputted a valid direction, use it. otherwise, use his last valid input */ - if((dir.mx != 0 || dir.my != 0) && !(dir.mx == 1 && lastMoveDir.mx == -1) && !(dir.mx == -1 && lastMoveDir.mx == 1) && !(dir.my == 1 && lastMoveDir.my == -1) && !(dir.my == -1 && lastMoveDir.my == 1)) { - lastMoveDir = dir; - } - - uint8 ateFood = 0; - /* check if snake is moving onto food */ - if((snakePositions.vectors[0].mx + lastMoveDir.mx == foodPos.mx) && (snakePositions.vectors[0].my + lastMoveDir.my == foodPos.my)) { - ateFood = 1; - score += 1; - if(updateInterval > 100000000) { - updateInterval -= 10000000; - } - /* move the food */ - while(1) { - uint8 overlap = 0; - foodPos = init_vector(1 + (rand() % (boardSize - 2)), 1 + (rand() % (boardSize - 2))); - /* if food overlaps snake or obstacles, try again */ - for(int i = 0; i < snakePositions.length; i++) { - if((snakePositions.vectors[i].mx == foodPos.mx) && (snakePositions.vectors[i].my == foodPos.my)) { - overlap = 1; - } - } - for(int i = 0; i < obstaclePositions.length; i++) { - if((obstaclePositions.vectors[i].mx == foodPos.mx) && (obstaclePositions.vectors[i].my == foodPos.my)) { - overlap = 1; - } - } - if(!overlap) { - break; - } - } - } - /* move the snake */ - vectorp_t newSnakePositions = move_snake(lastMoveDir, ateFood); - free(snakePositions.vectors); - snakePositions = newSnakePositions; - /* check if snake landed on self */ - for(int i = 1; i < snakePositions.length; i++) { - if(snakePositions.vectors[0].mx == snakePositions.vectors[i].mx && snakePositions.vectors[0].my == snakePositions.vectors[i].my) { - /* game over */ - goto EXIT; - } - } - /* check if snake landed on obstacle */ - for(int i = 0; i < obstaclePositions.length; i++) { - if((snakePositions.vectors[0].mx == obstaclePositions.vectors[i].mx) && (snakePositions.vectors[0].my == obstaclePositions.vectors[i].my)) { - goto EXIT; - } - } - } -EXIT: - /* clear the last getch call from the listener */ - *cancellationToken = 1; - printf("\n%sYou died. Score: %d. Press any key to exit%s\n", RED, score, COLOR_RESET); - printf("\033[?25h"); - pthread_join(listenerID, NULL); - free(cancellationToken); - free((int*)lastInput); - return 0; -} -void* get_dir_loop(void* threadArg) { - while(!*(int*)((threadArg_t*)threadArg)->cancellationToken) { - *(char*)((threadArg_t*)threadArg)->returnV = getch(); - } - return NULL; -} -/* parses WASD or HJKL, returns the necessary deltas to move within a 2d array */ -vector_t parse_dir(char cDir) { - if(cDir == 'w' || cDir == 'k') { - return init_vector(0, -1); - } - else if(cDir == 'd' || cDir == 'l') { - return init_vector(1, 0); - } - else if(cDir == 's' || cDir == 'j') { - return init_vector(0, 1); - } - else if(cDir == 'a' || cDir == 'h') { - return init_vector(-1, 0); - } - else { - return init_vector(0, 0); - } -} -vectorp_t move_snake(vector_t dir, int lengthen) { - int newLength = snakePositions.length + (lengthen ? 1 : 0); - vector_t* newSnakePositions = malloc((newLength * sizeof(vector_t))); - /* wrap around edges */ - int nhx = snakePositions.vectors[0].mx + dir.mx; - nhx = nhx < 0 ? boardSize - 1 : nhx >= boardSize ? 0 : nhx; - int nhy = snakePositions.vectors[0].my + dir.my; - nhy = nhy < 0 ? boardSize - 1 : nhy >= boardSize ? 0 : nhy; - newSnakePositions[0] = init_vector(nhx, nhy); - for(int i = 1; i < newLength; i++) { - newSnakePositions[i] = snakePositions.vectors[i - 1]; - } - return init_vectorp(newSnakePositions, newLength); -} -void draw_board() { - /* move the cursor to the top left corner of the screen */ - printf("\033[0;0H"); - /* iterate through and write the board */ - for(int r = 0; r < boardSize; r++) { - for(int c = 0; c < boardSize; c++) { - /* determine the contents of the board position */ - int type = 0; - /* 0=horizontal, 1=vertical, 2=diagonal slant right, 3=diagonal slant left */ - int tailOrientation = 0; - for(int i = 0; i < snakePositions.length; i++) { - if(snakePositions.vectors[i].mx == c && snakePositions.vectors[i].my == r) { - if(i > 0) { - type = 2; - /* get the delta to the connecting tail */ - int dx; - int dy; - if(i < snakePositions.length - 1) { - dx = snakePositions.vectors[i - 1].mx - snakePositions.vectors[i + 1].mx; - dy = snakePositions.vectors[i - 1].my - snakePositions.vectors[i + 1].my; - } - else { - dx = snakePositions.vectors[i - 1].mx - c; - dy = snakePositions.vectors[i - 1].my - r; - } - if(dy == 0) { - tailOrientation = 0; - } - else if(dx == 0) { - tailOrientation = 1; - } - else if((dx == 1 && dy == 1) || (dx == -1 && dy == -1)) { - tailOrientation = 3; - } - else if((dx == -1 && dy == 1) || (dx == 1 && dy == -1)) { - tailOrientation = 2; - } - } - else { - type = 1; - } - break; - } - } - if(foodPos.mx == c && foodPos.my == r) { - type = 3; - } - for(int i = 0; i < obstaclePositions.length; i++) { - if(obstaclePositions.vectors[i].mx == c && obstaclePositions.vectors[i].my == r) { - type = 4; - break; - } - } - /* append the appropriate value */ - if(type == 0) { - /* empty square */ - printf("` "); - } - else if(type == 1) { - /* snake head */ - printf("%s@ %s", GRN, COLOR_RESET); - } - else if(type == 2) { - /* snake body */ - char bodyChar = tailOrientation == 0 ? '-' - : tailOrientation == 1 ? '|' - : tailOrientation == 2 ? '/' - : tailOrientation == 3 ? '\\' - : '*'; - printf("%s%c %s", GRN, bodyChar, COLOR_RESET); - } - else if(type == 3) { - /* food */ - printf("%sF %s", MAG, COLOR_RESET); - } - else if(type == 4) { - /* obstacle */ - printf("%s# %s", RED, COLOR_RESET); - } - } - printf("\n"); - } -} -- cgit v1.3.1