kvir0.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          */
/*                                                                       */
/*      KVIR0.c                                          1.9             */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      All                                                              */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains the VirtualRect function.                     */
/*                                                                       */
/* 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"


/* Function VirtualRect sets the virtual rectangle limits of the current 
grafPort to the rectangle specified by vRECT. */

void VirtualRect(rect *vRECT)
{
	void mwGblCoord(void);
		short grafErrValue;	/* error value */

	/* check for null and negative size rectangles */
	if ((vRECT->Xmin == vRECT->Xmax) || (vRECT->Ymin == vRECT->Ymax))
	{
		grafErrValue = c_VirtualR +  c_NullRect;
		nuGrafErr(grafErrValue);	/* report error */
		return;
	}
	if ((vRECT->Xmin > vRECT->Xmax) || (vRECT->Ymin > vRECT->Ymax))
	{
		grafErrValue = c_VirtualR +  c_OfloRect;
		nuGrafErr(grafErrValue);	/* report error */
		return;
	}
					;
	thePort->portFlags |= pfVirtual;	/* set user port flags */
	thePort->portVirt.Xmin = vRECT->Xmin;	/* set user port virtrect */
	thePort->portVirt.Ymin = vRECT->Ymin;
	thePort->portVirt.Xmax = vRECT->Xmax;
	thePort->portVirt.Ymax = vRECT->Ymax;
	grafPort.portFlags |= pfVirtual;	/* set shadow port flags */
	grafPort.portVirt.Xmin = vRECT->Xmin;	/* set shadow port virtrect */
	grafPort.portVirt.Ymin = vRECT->Ymin;
	grafPort.portVirt.Xmax = vRECT->Xmax;
	grafPort.portVirt.Ymax = vRECT->Ymax;

	mwGblCoord();	/* update precomputed xform constants */

	return;
}