zect3.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          */
/*                                                                       */
/*      ZECT3.c                                          1.9             */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      All                                                              */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains the InsetRect 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 INSETRECT shrinks or expands the specified rectangle 'R'.
   The left and right sides are moved toward the center by the amount specifed
   by DX; the top and bottom are moved to the center by the amount specified
   DY.  If DX or DY are negative the appropriate pair of sides are moved
   outward instead of inward.  The effect of INSETRECT is to alter the size
   of rectangle 'R' by R*DX horizontally and 2*DY vertically, with the rectangle
   center remaining centered at the same position.*/

void InsetRect ( rect * R , short dltX , short dltY )

{
	short Ctr;
	short ErrValue;

/* Restore the Value of X and Y with proper size  */	
	
	R->Xmin = R->Xmin + dltX ;
	R->Xmax = R->Xmax - dltX ; 
	R->Ymin	= R->Ymin + dltY ;
	R->Ymax	= R->Ymax - dltY ;
	
/* Checking Error for X coordination  */ 

#ifdef ErrChecks

	if ( (R->Xmax - R->Xmin) > 32767 )
	{
		ErrValue = c_InsetRec + c_OfloRect;
		nuGrafErr(ErrValue);

		Ctr = (R->Xmin + R->Xmax) >> 1;
		R->Xmin = Ctr - 16383;			/* Resize for both Min */
	    R->Xmax = Ctr + 16383;          /* and Max value       */
	}
	if ( R->Xmin > R->Xmax )
	{
		ErrValue = c_InsetRec + c_NullRect;
		nuGrafErr(ErrValue);

		Ctr = (R->Xmin + R->Xmax) >> 1;
		R->Xmin = Ctr ;					/* Resize for both Min */
		R->Xmax = Ctr ;					/* and Max value       */
	}
#endif


/* Checking Error for Y coordination  */

#ifdef ErrChecks

	if ( (R->Ymax - R->Ymin) > 32767 )
	{
		ErrValue = c_InsetRec + c_OfloRect;
		nuGrafErr(ErrValue);
		Ctr = (R->Ymin + R->Ymax) >> 1;
		R->Ymin = Ctr - 16383;			/* Resize for both Min */
	    R->Ymax = Ctr + 16383;			/* and Max value       */
	}
	if ( R->Ymin > R->Ymax )
	{
		ErrValue = c_InsetRec + c_NullRect;
		nuGrafErr(ErrValue);

		Ctr = (R->Ymin + R->Ymax) >> 1;
		R->Ymin = Ctr ;					/* Resize for both Min */
		R->Ymax = Ctr ;					/* and Max value       */
	}
#endif

}