Initialization

cv9/snake.c

@@ -0,0 +1,23 @@
+#include "snake.h"
+#include <stdlib.h>
+
+struct snake* add_snake(struct snake* snake,int x,int y){
+    return NULL;
+}
+
+struct snake* remove_snake(struct snake* snake){
+    return NULL;
+}
+
+void free_snake(struct snake* sn){
+}
+
+int is_snake(struct snake* snake,int x,int y){
+    return 0;
+}
+
+int step_state(struct state* st){
+	int nx = (st->snake->x + st->sx);
+    int ny = (st->snake->y + st->sy);
+    return END_CONTINUE;
+}

cv9/snake/Makefile

@@ -0,0 +1,14 @@
+CFLAGS=-std=c99 -Wall -g
+
+all: game
+
+%.o: %.c
+	gcc $(CFLAGS) -c $< -o $@
+
+clean:
+	rm *.o
+	rm game
+
+game: main.o world.o snake.o
+	gcc -rdynamic -g main.o world.o snake.o -lcurses -lm -o game
+

cv9/snake/README.md

@@ -0,0 +1,16 @@
+# Snake Master
+
+Implement Snake game.
+
+Make the game to pass the automatic tests and make the game to be nice.
+
+## Files
+
+Please do not change file names.
+
+- `snake.h`: you implementation should follow this header.
+- `snake.c`: implemement the game according to the documentation in header file  in this file to pass automatic tests.
+- `Makefile`: rules to build the game.
+- `main.c`: trivial main function that runs the game, modify this file to change the appereance of the game and the initial state.
+- `world.c`: world game loop and ASCII graphics library (do not change).
+- `world.h`: world library interface (do not change).

cv9/snake/main.c

@@ -0,0 +1,110 @@
+#include "world.h"
+#include <stdlib.h>
+#include <curses.h>
+#include <stdlib.h>
+#include <string.h>
+#include "snake.h"
+// This file contains functions for drawing the the game and changing the state
+
+// Start is called one in the beginning
+void* init_game(){
+    // Allocate memory for the state
+    struct state* st = calloc(1,(sizeof(struct state)));
+    return st;
+}
+
+// The first event
+// Initialize game state
+// - borders
+// - snake position
+// - food position
+void init_snake(struct event* world, struct state* st){
+    int cy = world->height/2;
+    int cx = world->width/2 - 5;
+    for (int i = 0; i < 5; i++){
+        st->snake = add_snake(st->snake,cx + i ,cy);
+    }
+
+    int h = world->height;
+    int w = world->width;
+    for (int i = 0; i < 5; i++){
+        st->foodx[i] = rand() % w;
+        st->foody[i] = rand() % h;
+    }
+    // Initial game vector
+    st->sx = 1;
+    st->sy = 0;
+}
+
+// Step is called in a loop once in interval.
+// It should modify the state and draw it.
+int world_event(struct event* w,void* game){
+    // Get state pointer
+    struct state* st = game;
+    if (w->type == EVENT_START){
+        // Called on beginning
+        init_snake(w,st);
+    }
+    // Called on key press
+    else if (w->type == EVENT_KEY){
+        int key = w->key;
+        // Modifies vector of snake movement
+        if (key == KEY_RIGHT){
+           st->sx = 1;
+           st->sy = 0;
+        }
+        else if (key == KEY_LEFT){
+            st->sx = -1;
+            st->sy = 0;
+        }
+        else if (key == KEY_DOWN){
+            st->sx = 0;
+            st->sy = 1;
+        }
+        else if (key == KEY_UP){
+            st->sx = 0;
+            st->sy = -1;
+        }
+    }
+    // Called on esc key
+    else if (w->type == EVENT_ESC){
+            // Non zero means finish the loop and stop the game.
+            return 1;
+    }
+    // Called on interval timeout
+    else if (w->type == EVENT_TIMEOUT){
+        clear_screen();
+        // Copy screen size
+        st->width = w->width;
+        st->height = w->height;
+        // Change game state
+        int r = step_state(st);
+        char ms[200];
+        sprintf(ms,"r %d\n",r);
+        set_message(ms,9,9);
+        // Draw snake
+        struct snake* sn = st->snake;
+        while (sn != NULL){
+            set_cell('x',sn->x,sn->y);
+            sn = sn->next;
+        }
+        // Draw food
+        for (int i = 0 ; i < FOOD_COUNT; i++){
+            if (st->foodx[i] >= 0 && st->foody[i] >= 0){
+                set_cell('*',st->foodx[i],st->foody[i]);
+            }
+        }
+        // Stop the game
+        if (r){
+            char message[] = "Koniec";
+            set_message(message,10,10);
+        }
+    }
+    return 0;
+}
+
+
+int main(int argc, char** argv){
+    start_world(init_game,world_event,free);
+    return 0;
+}

cv9/snake/snake.c

@@ -0,0 +1,23 @@
+#include "snake.h"
+#include <stdlib.h>
+
+struct snake* add_snake(struct snake* snake,int x,int y){
+    return NULL;
+}
+
+struct snake* remove_snake(struct snake* snake){
+    return NULL;
+}
+
+void free_snake(struct snake* sn){
+}
+
+int is_snake(struct snake* snake,int x,int y){
+    return 0;
+}
+
+int step_state(struct state* st){
+	int nx = (st->snake->x + st->sx);
+    int ny = (st->snake->y + st->sy);
+    return END_CONTINUE;
+}

cv9/snake/snake.h

@@ -0,0 +1,114 @@
+#ifndef snake_h_INCLUDED
+#define snake_h_INCLUDED
+
+// Number of food items on the plane
+#define FOOD_COUNT 5
+
+/**
+ * One part of the snake;
+ * 
+ * The snake is a linked list;
+ */
+ 
+struct snake {
+    // x position of the snake part
+    int x;
+    // y position of the snake part
+    int y;
+    // Pointer to the next snake part.
+    // The last part of the snake has NULL pointer to the next part.
+    struct snake* next;
+};
+
+// End game reason constants, return value of step_state
+enum endgame {
+    // Continue the game
+    END_CONTINUE = 0,
+    // Snake hit a wall
+    END_WALL,
+    // Snake hit itself
+    END_SNAKE,
+    // No food left
+    END_FOOD,
+    // Other reason to end
+    END_USER
+};
+
+/**
+ * State of the game.
+ * 
+ * The state consists of the snake, its speed and food on the plane.
+ * 
+ * The snake is a linked list of snake parts.
+ * 
+ * Speed vector is a vector added to the last head position to create a new head.
+ * 
+ * Food are points on the plane. Food with negative coordinates meads food is already eaten.
+ */
+ 
+struct state {
+    // Snake as a linked list
+    struct snake* snake;
+    // X of the food positions
+    int foodx[FOOD_COUNT];
+    // Y of the food positions
+    int foody[FOOD_COUNT];
+    int sx;
+    int sy;
+    int width;
+    int height;
+};
+
+/**
+ * Add a new snake part with given position. The new snake part becomes the new head.
+ *
+ * @param head of the snake.
+ * @param x coordinate of the new head;
+ * @param y coordinate of the new head.
+ * @return new head of the snake.
+ */
+struct snake* add_snake(struct snake* snake,int x,int y);
+
+/**
+ * Remove the last snake part.
+ * The last snake part  should always have NULL next pointer.
+ *
+ * @param head of the snake.
+ * @return new head of the snake.
+ */
+struct snake* remove_snake(struct snake* snake);
+
+/**
+ * Finds out if given coordinates are part of the snake.
+ * @param snake
+ * @param x coordinate to search in snake
+ * @param y coordinate to search in snake
+ * @return True, if there is a snake part with coordinates x,y. False otherwise
+ *
+ */
+int is_snake(struct snake* snake,int x, int y);
+/**
+ * Remove and free each snake part;
+ * @param head of the snake.
+ */
+void free_snake(struct snake* sn);
+/**
+ * Change game state.
+ *
+ * The function shoud calculate new posision of the snake head
+ * from the current position and speed vector.
+ * Then it should modify snake parst  or food coordinates according to the rules:
+ * 
+ * - If the new position is on the snake, end the game, return END_SNAKE.
+ * - If the new position is on the food, mark food as eaten
+ *   (set its coordinates to -1) and add new snake part on the position of the food. If there is no food left, return END_FOOD. else return END_CONTINUE.
+ * - If the new position is on the plane, add new snake part on the new position and remove the last part of the snake, return END_CONTINUE.
+ * 
+ * @param current state of the game
+ * @return reason to end the game according to enum endgame.
+ */
+int step_state(struct state* state);
+
+
+#endif // snake_h_INCLUDED
+

cv9/snake/world.c

@@ -0,0 +1,198 @@
+#include "world.h"
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+int TIMEOUT;
+
+void abort_game(const char* message){
+    endwin();
+    puts(message);
+    exit(1);
+}
+
+void check_bounds(const char* source,int x, int y){
+    char msg[200];
+    if (x < 0 || x >= COLS){
+        sprintf(msg,"%s:: width %d is out of bounds (0,%d)",source,x,COLS);
+        abort_game(msg);
+    }
+    if (y < 0 || y >= LINES){
+        sprintf(msg,"%s:: height %d is out of bounds (0,%d)",source,y,LINES);
+        abort_game(msg);
+    }
+}
+
+void clear_screen(){
+    // Clear screen
+    mvaddch(0,0,' ');
+    int screenchars = LINES*COLS;
+    for (int j = 1; j < screenchars;j++ ){
+        addch(' ');
+    }
+}
+
+void game_speed(int value){
+    if (value < 0){
+        abort_game("world_seed:: cannot be negative\n");
+    }
+    TIMEOUT =value;
+}
+
+void set_message(const char* message,int x,int y) {
+    int l = strlen(message);
+    for (int i = 0; i < l; i++){
+        check_bounds("set_message",x+i,y);
+        set_cell(message[i],x+i,y);
+    }
+}
+
+void assert_message(int event,const char* message){
+    if (event == 0){
+        abort_game(message);
+    }
+}
+
+
+void set_cell(int character,int x,int y) {
+    check_bounds("set_cell",x,y);
+    set_color_cell(character,x,y,COLOR_WHITE,COLOR_BLACK);
+}
+
+void set_color_cell(int character,int x,int y,short front_color,short back_color){
+    check_bounds("set_color_cell",x,y);
+    if (has_colors()){
+        int pair = COLOR_COUNT * front_color + back_color; 
+        attron(COLOR_PAIR(pair));
+        mvaddch(y,x,character);
+        attroff(COLOR_PAIR(pair));
+    }
+    else{
+        mvaddch(y,x,character);
+    }
+}
+
+int start_world(void* (*init_game)(),int (*world_event)(struct event* event,void* game),void (*destroy_game)(void*)){
+    srand(time(NULL));
+    int r = 1;
+    // Speed global variable
+    TIMEOUT = 100;
+    if (initscr() == NULL){
+        // TODO Which Error?
+        puts("Curses Error.");
+        return -1;
+    }
+    noecho(); // Nevypisuj vstup na obrazovku
+    cbreak(); // Zabudni starý vstup
+    nodelay(stdscr,TRUE); // Nečakaj na stlačenie
+    keypad(stdscr,TRUE); // Aktivuje šípky
+    curs_set(FALSE); // Neviditeľný kurzor
+    /* Get all the mouse events */
+    mousemask(ALL_MOUSE_EVENTS, NULL);
+    MEVENT mouse_event;
+    if (has_colors()){ // Zistenie či terminál podporuje farby
+        start_color();
+        for (int i = 0; i < COLOR_COUNT;i++){
+            for (int j = 0; j < COLOR_COUNT;j++){
+                init_pair(i * COLOR_COUNT + j, i,j);
+            }
+        }
+    }
+    else {
+        puts("No colors!\n");
+    }
+    void* game = NULL;
+    if (init_game != NULL){
+         game = init_game();
+         assert_message(game != NULL,"init_game:: should return non null pointer");
+    }
+    timeout(TIMEOUT);
+    // Initial step
+    struct event event;
+    memset(&event,0,sizeof(struct event));
+    event.height = LINES;
+    event.width = COLS;
+    event.type = EVENT_START;
+    clock_t start_time = clock();
+    clock_t last_timeout = start_time;
+    clock_t next_timeout = last_timeout + TIMEOUT;
+    event.time_ms = start_time;
+    // Start event
+    r = world_event(&event,game);
+    refresh();
+    while (!r) {
+        memset(&event,0,sizeof(struct event));
+        event.height = LINES;
+        event.width = COLS;
+        event.key = getch();
+        // No key was pressed
+        if (event.key == ERR){
+            event.type = EVENT_TIMEOUT;
+            last_timeout = clock();
+            next_timeout = last_timeout + TIMEOUT;
+        }
+        // Mouse event
+        else if (event.key == KEY_MOUSE ){
+            event.type = EVENT_MOUSE;
+            if(getmouse(&mouse_event) == OK){
+                event.mouse_x = mouse_event.x;
+                event.mouse_y = mouse_event.y;
+                if(mouse_event.bstate & BUTTON1_PRESSED){
+                    event.mouse_left = 1;
+                }
+                if(mouse_event.bstate & BUTTON2_PRESSED){
+                    event.mouse_middle = 1;
+                }
+                if(mouse_event.bstate & BUTTON3_PRESSED){
+                    event.mouse_right = 1;
+                }
+            }
+        }
+        else if (event.key == KEY_RESIZE) {
+            event.type = EVENT_RESIZE;
+        }
+        else{
+            event.type = EVENT_KEY;
+            if (event.key == 27){
+                int k = getch();
+                if (k == -1){
+                    // Esc Was pressed
+                    event.type = EVENT_ESC;
+                }
+                else {
+                    // Alt was pressed
+                    event.key = k;
+                    event.alt_key = 1;
+                }
+            }
+        }
+        // Draw new world
+        event.time_ms = clock();
+        r = world_event(&event,game);
+        refresh();
+        event.time_ms = clock();
+        // set new timeout
+        int nt = next_timeout - event.time_ms;
+        //printf("%d\n",nt);
+        if (nt > 0){
+            timeout(nt);
+        }
+        else {
+            timeout(TIMEOUT);
+            next_timeout = event.time_ms + TIMEOUT;
+        }
+    }
+    memset(&event,0,sizeof(struct event));
+    event.height = LINES;
+    event.width = COLS;
+    event.type = EVENT_END;
+    event.time_ms = clock();
+    world_event(&event,game);
+    if (destroy_game != NULL){
+        destroy_game(game);
+    }
+    endwin();
+    return r;
+};

cv9/snake/world.h

@@ -0,0 +1,122 @@
+#ifndef _WORLD_H_
+#define _WORLD_H_
+
+#include <curses.h>
+
+/**
+ * World represented as a rectangular matrix of colorful characters.
+ * 
+ * Point [0,0] is displayed the upper left corner of the screen.
+ * 
+ */
+
+enum event_type {
+    EVENT_START,
+    EVENT_TIMEOUT,
+    EVENT_KEY,
+    EVENT_MOUSE,
+    EVENT_RESIZE,
+    EVENT_ESC,
+    EVENT_END,
+};
+
+struct event {
+    /**
+     * Last width of the screen.
+     */
+    int width;
+    /**
+     * Last height of the screen.
+     */
+    int height;
+    /**
+     * Last pressed key or Curses event.
+     *
+     * Special event  values:
+     * ERR if timeout,
+     * KEY_RESIZE if screen resize
+     * KEY_EVENT, other event,
+     * KEY_MOUSE, mouse clicked
+     *
+     * Key values:
+     *
+     * ' ' Space
+     * KEY_DOWN Arrow down
+     * KEY_UP Arrow up
+     * KEY_LEFT Arrow left
+     * KEY_RIGHT Arrow right
+     * KEY_A1 Upper left of keypad
+     * KEY_A3 Upper right of keypad
+     * KEY_B2 Center of keypad
+     * KEY_C1 Lower left of keypad
+     * KEY_C3 Lower right of keypad
+     *
+     * KEY_ENTER
+     * KEY_BACKSPACE
+     */
+    int key;
+    int alt_key;
+    enum event_type type;
+    int mouse_x;
+    int mouse_y;
+    int mouse_left;
+    int mouse_right;
+    int mouse_middle;
+    long int time_ms;
+};
+
+/**
+ * Sets cell to a state.
+ * @param event 
+ * @param x coordinate of cell
+ * @param y coordinate of cell
+ * @param new state of the cell
+ */
+void set_cell(int character,int x,int y);
+
+/**
+ * COLOR_BLACK   0
+ * COLOR_RED     1
+ * COLOR_GREEN   2
+ * COLOR_YELLOW  3
+ * COLOR_BLUE    4
+ * COLOR_MAGENTA 5
+ * COLOR_CYAN    6
+ * COLOR_WHITE   7
+ */
+
+#define COLOR_COUNT 8
+
+void set_color_cell(int character,int x,int y,short front_color,short back_color);
+
+
+/**
+ *
+ * @param event
+ * @param number of commandline arguments
+ * @param init_world
+ * @param destroy_world
+ *
+ * void init_world(struct event* w);
+ * Initializes user state.
+ * Free user state.
+ * @param event
+ */
+
+int start_world(void* (*init_game)(),int (*world_event)(struct event* event,void* game),void (*destroy_game)(void* game));
+/**
+ * Set timeout interval in miliseconds
+ */
+void game_speed(int value);
+
+/*
+ * Prints a message in screen on a position x,y
+ */
+
+void set_message(const char* message,int x,int y);
+/*
+ * Clears screen
+ */
+void clear_screen();
+
+#endif