gui__intersectrects.c

MCB2300_ucgui_LCD320240.rar LPC2368的uc/gui的移植

/*
*********************************************************************************************************
*   											 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		: GUI_IntersectRects.c
Purpose 	: Implementation of GUI_IntersectRects
---------------------------END-OF-HEADER------------------------------
*/

#include "GUI_Protected.h"

/*********************************************************************
*
*   	Macros
*
**********************************************************************
*/

#define MIN(v0,v1) ((v0>v1) ? v1 : v0)
#define MAX(v0,v1) ((v0>v1) ? v0 : v1)

/*********************************************************************
*
*   	Public code
*
**********************************************************************
*/
/*********************************************************************
*
*   	GUI__IntersectRects
*
* Purpose:
*   Calc intersection of rectangles
*
* Return value:
*   1 if they do intersect,
*   0 if there is no intersection
*
* Add. info:
*   Rectangles are passed as pointers. These pointers need to be valid;
*   a NULL pointer may not be passed. There is no check for NULL pointers
*   implemented in order to avoid avoid performance penalty.
*/
int GUI__IntersectRects(GUI_RECT *pDest, const GUI_RECT *pr0, const GUI_RECT *pr1)
{
	pDest->x0 = MAX(pr0->x0, pr1->x0);
	pDest->y0 = MAX(pr0->y0, pr1->y0);
	pDest->x1 = MIN(pr0->x1, pr1->x1);
	pDest->y1 = MIN(pr0->y1, pr1->y1);
	if (pDest->x1 < pDest->x0)
	{
		return 0;
	}
	if (pDest->y1 < pDest->y0)
	{
		return 0;
	}
	return 1;
}

/*************************** End of file ****************************/