Monday, January 9, 2012

GLUT Tutorial – Handling Keyboard Events

Almost all of the games use Keyboard to control the objects i.e. to move, jump, turn, slide etc.  Keyboard events is essential part of game programming. All game development libraries support Keyboard Handling. GLUT also has nice and simple functions that provide the facility of Keyboard controlling. GLUT provides different functions to handle NORMAL key events like 1 , 2 , A, B, ESC (having ASCII code)  and SPECIAL key events like UP, DOWN, F1 etc.

The first one,glutKeyboardFunc, is used to tell the windows system which function we want to process the "normal" key events. By "normal" keys, we mean letters, numbers, anything that has an ASCII code. The syntax for this function is as follows:
void glutKeyboardFunc(void (*func) (unsigned char key, int x, int y));
where, func - The name of the function that will process the "normal" keyboard events. Passing NULL as an argument causes GLUT to ignore "normal" keys.The function used as an argument to glutKeyboardFunc needs to have three arguments. The first indicates the ASCII code of the key pressed, the remaining two arguments provide the mouse position when the key is pressed. The mouse position is relative to the top left corner of the client area of the window.
The second one, glutSpecialFunc, is used to tell the windows system which function we want to process the “special” key events. The syntax for this is as follows.
void glutSpecialFunc(void (*func) (int key, int x, int y));                                                                  

where, func - The name of the function that will process the special keyboard events. Passing NULL as an argument causes GLUT to ignore the special keys.
The GLUT_KEY_* are predefined constants in glut.h. The full set of constants is presented next:
GLUT_KEY_F1  F1 function key
GLUT_KEY_F2  F2 function key
GLUT_KEY_F3  F3 function key
GLUT_KEY_F4  F4 function key
GLUT_KEY_F5  F5 function key
GLUT_KEY_F6  F6 function key
GLUT_KEY_F7  F7 function key
GLUT_KEY_F8  F8 function key
GLUT_KEY_F9  F9 function key
GLUT_KEY_F10  F10 function key
GLUT_KEY_F11  F11 function key
GLUT_KEY_F12  F12 function key
GLUT_KEY_LEFT  Left function key
GLUT_KEY_RIGHT  Right function key
GLUT_KEY_UP  Up function key
GLUT_KEY_DOWN  Down function key
GLUT_KEY_PAGE_UP Page Up function key
GLUT_KEY_PAGE_DOWN Page Down function key
GLUT_KEY_HOME  Home function key
GLUT_KEY_END  End function key
GLUT_KEY_INSERT  Insert function key

1 comment:

  1. Thanks for sharing this great content, I really enjoyed the insign you bring to the topic, awesome stuff!

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