gui2dlib.c

来自「嵌入式操作系统ucosii的gui,即图形用户界面」· C语言 代码 · 共 68 行

/*
*********************************************************************************************************
*                                                uC/GUI
*                        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    : GUI2DLib.C
* Purpose : Main part of the 2D graphics library
*
*
* Version-Date---Author-Explanation
*
* 1.00.00 020517 RS     First release
*
*
* Known problems or limitations with current version
*
*    None.
*
*
* Open issues
*
*    None
*********************************************************************************************************
*/

#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