zect8.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          */
/*                                                                       */
/*      ZECT8.c                                          1.9             */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      All                                                              */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains the PT2RECT function.                         */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      Giac Dinh, 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 PT2RECT RETURNs rectangle R with the smallest rectangle which 
   contains the two points PT1 & PT2.*/

void Pt2Rect ( point * PT1, point * PT2, rect * R )
{
	short ErrValue;
	long TemPt;

	if ( PT2->X < PT1->X )
	{
		R->Xmin = PT2->X;	/* Loading value  */
		R->Xmax = PT1->X;
	}
	else
	{
		R->Xmin = PT1->X;	/* Loading value  */
		R->Xmax = PT2->X;
	}

#ifdef ErrChecks
/* Error Checking to make sure that Xmin and Xmax are properly assigned  */
	
	if ( (R->Xmax - R->Xmin) > 32767)	/* check for overflow condition */
	{
		/* Notify the Error with conditional flag     */
		ErrValue = c_Pt2Rect + c_OfloRect;
		nuGrafErr(ErrValue);
		
		TemPt = ((R->Xmax + R->Xmin) >> 1);	/* get mid point */
		R->Xmax = TemPt + 16383;			/* assign Min and Max value */
		R->Xmin = TemPt - 16383;			/* for X coordination       */	
	}
#endif 

	if ( PT2->Y < PT1->Y )
	{
		R->Ymin = PT2->Y;	/* Loading value  */
		R->Ymax = PT1->Y;
	}
	else
	{
		R->Ymin = PT1->Y;	/* Loading value  */
		R->Ymax = PT2->Y;
	}

#ifdef ErrChecks
/* Error Checking to make sure that Xmin and Xmax are properly assigned  */
	
	if ( (R->Ymax - R->Ymin) > 32767)	/* check for overflow condition */
	{
		/* Notify the Error with conditional flag     */
		ErrValue = c_Pt2Rect + c_OfloRect;
		nuGrafErr(ErrValue);
		
		TemPt = ((R->Ymax + R->Ymin) >> 1);	/* get mid point */
		R->Ymax = TemPt + 16383;			/* assign Min and Max value */
		R->Ymin = TemPt - 16383;			/* for X coordination       */	
	}
#endif 

	return;
}