gui_drawline.c

ucgui的3.98版本的源代码

/*
*********************************************************************************************************
*                                             uC/GUI V3.98
*                        Universal graphic software for embedded applications
*
*                       (c) Copyright 2002, Micrium Inc., Weston, FL
*                       (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
*
*              礐/GUI is protected by international copyright laws. Knowledge of the
*              source code may not be used to write a similar product. This file may
*              only be used in accordance with a license and should not be redistributed
*              in any way. We appreciate your understanding and fairness.
*
----------------------------------------------------------------------
File        : GUI_DrawLine.c
Purpose     : Implementation of line drawing routines
---------------------------END-OF-HEADER------------------------------
*/

#include <stddef.h>           /* needed for definition of NULL */
#include "GUI_Protected.h"
#include "GUIDebug.h"

/*********************************************************************
*
*       Defines
*
**********************************************************************
*/

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

/*********************************************************************
*
*       Static code
*
**********************************************************************
*/
/*********************************************************************
*
*       _SwapInt
*/
static void _SwapInt(int* pa, int* pb) {
  int t;
  t = *pa;
  *pa = *pb;
  *pb = t;
}

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

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