gui2dlib.c

来自「uCGUI」· C语言 代码 · 共 31 行

/*************************************************************************************************************
                                                   uC/GUI
                                               嵌入式通用图形软件
File        : GUI2DLib.C
Purpose     : Main part of the 2D graphics library
************************************************************************************************************/
#include <stddef.h>           /* needed for definition of NULL */
#include "GUI_Private.H"
#include "GUIDebug.h"

/*************************************************************************************************************
* Misc. helper routines   
*************************************************************************************************************/
void GL_SwapInt(int* pa, int* pb) 
{
  int t = *pa;
  *pa = *pb;
  *pb = t;
}

#define ABS(v) ((v>0) ? v : -v)

static int Abs(int v) 
{ 
	return ABS(v); 
}

/*************************************************************************************************************
* Trigonometric functions            
All trigonometric functions are for internal usage only and
use the following conventions: Angles: 4096 <==> 360