refresh

a4/.gitignore

@@ -0,0 +1,54 @@
+game
+
+# Prerequisites
+*.d
+
+# Object files
+*.o
+*.ko
+*.obj
+*.elf
+
+# Linker output
+*.ilk
+*.map
+*.exp
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+
+# Debug files
+*.dSYM/
+*.su
+*.idb
+*.pdb
+
+# Kernel Module Compile Results
+*.mod*
+*.cmd
+.tmp_versions/
+modules.order
+Module.symvers
+Mkfile.old
+dkms.conf

a4/LICENSE

@@ -0,0 +1,29 @@
+BSD 3-Clause License
+
+Copyright (c) 2019, Daniel Hládek
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the copyright holder nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

a4/Makefile

@@ -0,0 +1,17 @@
+CC=gcc
+CFLAGS=-std=c99 -Wall -g
+
+all: game
+
+%.o: %.c
+	@echo "Компиляция $<..."
+	@$(CC) $(CFLAGS) -c $< -o $@
+
+game: main.o game.o world.o
+	@echo "Линкуем и создаём игру..."
+	@$(CC) $^ -lcurses -lm -o game
+
+clean:
+	@echo "Очистка..."
+	@rm -f *.o game
+

a4/README.md

@@ -0,0 +1,78 @@
+# World Game Library
+
+Learn asycnronous C programming by a game.
+
+The library implements a game loop for a character-based ncurses game;
+
+The library finds out the event types:
+
+- start and end
+- mouse events
+- keyboard events
+- screen resize events
+
+It can print colors and arbitrary characters on the screen. 
+Running is interrupted when character is drawn out of the screen.
+
+## Installation and Running
+
+Make sure, that `ncurses` is installed.
+
+Clone this repository.
+
+Compile:
+
+```c
+make
+```
+	
+Run:
+
+```c
+./game
+```
+
+## Make your own game
+
+The game happens in a rectangular world of colorful characters. 
+Your goal as a programmer is to modify the world according to the pressed keys and the internal game state.
+The library implements the game loop and draws the world to screen.
+
+Your game in file `game.c` consists of two functions:
+
+- `void* init_game()` is called in the beginning. Here you can initialize the internal state of the game.
+The function should return  a pointer to an instance of the initial game state `game`.
+- `int game_event(struct event* event,void* game)`
+is called by the game loop in periodic interval or when a key was pressed. Non-zero return value or `Ctrl+C` key interrupts the game loop.
+
+The world variable represents state of two-dimensional grid of characters on the screen. The screen matrix looks like this:
+
+```
+   origin
+   [0,0]     width
+  +--------------------+
+h |                    |
+e |                    |
+i |                    |
+g |                    |
+h |                    |
+t |                    |
+  +--------------------+
+```
+
+The world  has the following parameters:
+
+- `int height`: y-dimension of the grid.
+- `int width`: x-dimension of the grid.
+- `int interval`: maximum time between steps in milliseconds.
+
+### The Event Function
+
+The `int game_event(struct event* event,void* game)`
+ function should:
+
+1. Read the game state (from the `void* game`) pointer.
+1. Examine the pressed key from event pointer. If the `key` variable is non-zero, a key was pressed. According to the pressed key, modify the game state `game`.
+1. Draw the game state. In the beginning of the step function the screen is empty.
+1. Returning non-zero value ends the game loop. 
+

a4/game.c

@@ -0,0 +1,45 @@
+#include "game.h"
+#include "world.h"
+#include <stdlib.h>
+#include "world.h"
+#include <stdio.h>
+#include <ncurses.h>
+void* init_game(void) {
+    struct game* state = (struct game*)calloc(1, sizeof(struct game));
+    if (!state) { 
+        return NULL; 
+    }
+    state->cat_x = 5;
+    state->cat_y = 5;
+    state->cat_dx = 1;
+    state->cat_dy = 1;
+    state->mouse_x = 15;
+    state->mouse_y = 10;
+    snprintf(state->message, sizeof(state->message), "Давай, попробуй поймать меня!");
+    return state;
+}
+
+int game_event(struct event* event, void* g_state) {
+    struct game* game = (struct game*)g_state;
+    if (!game) return 0;
+
+    if (event->type == KEY_SREDO) {
+        switch (event->key) {
+            case KEY_UP:    game->cat_y -= game->cat_dy; break;
+            case KEY_DOWN:  game->cat_y += game->cat_dy; break;
+            case KEY_LEFT:  game->cat_x -= game->cat_dx; break;
+            case KEY_RIGHT: game->cat_x += game->cat_dx; break;
+            default: break;
+        }
+    }
+
+    game->mouse_x += (rand() % 3) - 1;
+    game->mouse_y += (rand() % 3) - 1;
+
+    if (game->cat_x == game->mouse_x && game->cat_y == game->mouse_y) {
+        snprintf(game->message, sizeof(game->message), "Мышь поймана! Ура!");
+    }
+
+    return 0;
+}
+

a4/game.h

@@ -0,0 +1,18 @@
+#ifndef _GAME_H_INCLUDE_
+#define _GAME_H_INCLUDE_
+
+#include "world.h"
+
+struct game {
+    int cat_dx, cat_dy;
+    int cat_x, cat_y;
+    int mouse_x, mouse_y;
+    int cat_dx_position, cat_dy_position;
+    char message[100];
+};
+
+void* init_game(void);
+int game_event(struct event* event, void* game);
+
+#endif
+                    

a4/main.c

@@ -0,0 +1,19 @@
+#include "game.h"
+#include "world.h"
+#include <stdlib.h>
+#include "world.h"
+#include <ncurses.h>
+int main(void) {
+    void* game_state = init_game();
+    if (!game_state) {
+        fprintf(stderr, "Не удалось инициализировать игру!\n");
+        return 1;
+    }
+
+    world_run(game_state, game_event);
+
+    free(game_state);
+    
+    return 0;
+}
+

a4/world.c

@@ -0,0 +1,135 @@
+#include "world.h"
+#include "game.h"
+#include <ncurses.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+int TIMEOUT = 100;
+
+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) {
+        snprintf(msg, sizeof(msg), "%s: width %d is out of bounds (0,%d)", source, x, COLS);
+        abort_game(msg);
+    }
+    if (y < 0 || y >= LINES) {
+        snprintf(msg, sizeof(msg), "%s: height %d is out of bounds (0,%d)", source, y, LINES);
+        abort_game(msg);
+    }
+}
+
+void clear_screen() {
+    mvaddch(0, 0, ' ');
+    int screenchars = LINES * COLS;
+    for (int i = 1; i < screenchars; i++) {
+        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 world_run(void* (*init_game)(), int (*world_event)(struct event* event, void* game)) {
+    void* game = init_game();
+    if (!game) {
+        return -1;
+    }
+
+    timeout(TIMEOUT);
+    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;
+    event.time_ms = start_time;
+
+    while (1) {
+        memset(&event, 0, sizeof(struct event));
+        event.height = LINES;
+        event.width = COLS;
+        event.type = EVENT_START;
+        event.time_ms = clock();
+
+        world_event(&event, game);
+
+        if (event.key == ERR) {
+            event.type = EVENT_TIMEOUT;
+            last_timeout = clock();
+            event.time_ms = last_timeout + TIMEOUT;
+        } else if (event.key == KEY_MOUSE) {
+            event.type = EVENT_MOUSE;
+            MEVENT mouse_event;
+            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) {  // ESC key
+                event.type = EVENT_ESC;
+            }
+        }
+
+        event.time_ms = clock();
+        world_event(&event, game);
+        timeout(TIMEOUT);
+    }
+
+    return 0;
+}
+

a4/world.h

@@ -0,0 +1,113 @@
+#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));
+
+void game_speed(int value);
+
+void set_message(const char* message,int x,int y);
+void clear_screen();
+
+#endif