69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/*
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*********************************************************************************************************
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* uC/GUI
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* Universal graphic software for embedded applications
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*
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* (c) Copyright 2002, Micrium Inc., Weston, FL
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* (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
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*
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* µC/GUI is protected by international copyright laws. Knowledge of the
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* source code may not be used to write a similar product. This file may
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* only be used in accordance with a license and should not be redistributed
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* in any way. We appreciate your understanding and fairness.
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*
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----------------------------------------------------------------------
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File : GUI_IntersectRects.c
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Purpose : Implementation of GUI_IntersectRects
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---------------------------END-OF-HEADER------------------------------
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*/
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#include "GUI_Protected.h"
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/*********************************************************************
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*
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* Macros
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*
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**********************************************************************
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*/
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#define MIN(v0,v1) ((v0>v1) ? v1 : v0)
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#define MAX(v0,v1) ((v0>v1) ? v0 : v1)
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/*********************************************************************
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*
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* Public code
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*
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**********************************************************************
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*/
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/*********************************************************************
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*
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* GUI__IntersectRects
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*
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* Purpose:
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* Calc intersection of rectangles
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*
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* Return value:
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* 1 if they do intersect,
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* 0 if there is no intersection
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*
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* Add. info:
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* Rectangles are passed as pointers. These pointers need to be valid;
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* a NULL pointer may not be passed. There is no check for NULL pointers
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* implemented in order to avoid avoid performance penalty.
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*/
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int GUI__IntersectRects(GUI_RECT* pDest, const GUI_RECT* pr0, const GUI_RECT* pr1) {
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pDest->x0 = MAX (pr0->x0, pr1->x0);
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pDest->y0 = MAX (pr0->y0, pr1->y0);
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pDest->x1 = MIN (pr0->x1, pr1->x1);
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pDest->y1 = MIN (pr0->y1, pr1->y1);
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if (pDest->x1 < pDest->x0) {
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return 0;
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}
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if (pDest->y1 < pDest->y0) {
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return 0;
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}
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return 1;
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}
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/*************************** End of file ****************************/
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