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+# 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. 
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