rect9.c

nucleus 文件系统,内核和彩色图形系统,在小系统上非常好用

/*************************************************************************/
/*                                                                       */
/*         Copyright (c) 1997 - 1999 Accelerated Technology, Inc.        */
/*                                                                       */
/* PROPRIETARY RIGHTS of Accelerated Technology are involved in the      */
/* subject matter of this material.  All manufacturing, reproduction,    */
/* use, and sales rights pertaining to this subject matter are governed  */
/* by the license agreement.  The recipient of this software implicitly  */
/* accepts the terms of the license.                                     */
/*                                                                       */
/*************************************************************************/

/*************************************************************************/
/*                                                                       */
/* FILE NAME                                            VERSION          */
/*                                                                       */
/*      RECT9.c                                          1.9             */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      All                                                              */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains the NullRect & EmptyRect functions.           */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      Robert G. Burrill, Accelerated Technology, Inc.                  */
/*                                                                       */
/* DATA STRUCTURES                                                       */
/*                                                                       */
/*      None                                                             */
/*                                                                       */
/* FUNCTIONS                                                             */
/*                                                                       */
/*      None                                                             */
/*                                                                       */
/* DEPENDENCIES                                                          */
/*                                                                       */
/*      None                                                             */
/*                                                                       */
/* HISTORY                                                               */
/*                                                                       */
/*         NAME            DATE                    REMARKS               */
/*                                                                       */
/*                                                                       */
/*************************************************************************/

#include "meta_wnd.h"
#include "metconst.h"    /* MetaWINDOW Constant & Stucture Definitions */
#include "metports.h"    /* MetaWINDOW Port & Bitmap Definitions */
#include "grafdata.h"
#include "metmacs3.h"


/* Function NullRect sets the rectangle pointed to by argR to have dimensions
of the center point of the rectangle, such that it contains no area. */

void NullRect(rect *argR)
{
			       
	argR->Xmin = (argR->Xmin + argR->Xmax) / 2;	/* compute average of Xs */
	argR->Xmax = argR->Xmin;
	argR->Ymin = (argR->Ymin + argR->Ymax) / 2;	/* compute average of Ys */
	argR->Ymax = argR->Ymin;

	return;
}


/* Function EmptyRect tests the rectangle pointed to by argR to see if it
contains any area (Xmax > Xmin and Ymax > Ymin). */

int EmptyRect(rect *argR)
{

	if ((argR->Xmax <= argR->Xmin) || (argR->Ymax <= argR->Ymin))
	{	/* rectangle is empty, return TRUE */
		return(1);
	}

	return(0);	/* rectangle is not empty, return FALSE */
}