(GLUT) 특수키처리

출처: http://www.lighthouse3d.com/opengl/glut/

...(중략)

OK, ready to move on? Lets tackle the special keys now. GLUT provides the function glutSpecialFunc so that you can register your function for special key events processing. The syntax for this function is as follows:

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void glutSpecialFunc(void (*func) (int key, int x, int y));

Parameters:

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.

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We're going to write a function that changes the color of our triangle when some of the special keys are pressed. This function will paint the triangle using red if F1 is pressed, green if F2 is pressed, and blue if F3 is pressed.

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void processSpecialKeys(int key, int x, int y) {

	switch(key) {
		case GLUT_KEY_F1 : 
				red = 1.0; 
				green = 0.0; 
				blue = 0.0; break;
		case GLUT_KEY_F2 : 
				red = 0.0; 
				green = 1.0; 
				blue = 0.0; break;
		case GLUT_KEY_F3 : 
				red = 0.0; 
				green = 0.0; 
				blue = 1.0; break;
	}
}

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The GLUT_KEY_* are predefined constants in glut.h. The full set of constants is presented next:

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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		Up function key
GLUT_KEY_UP		Right 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

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