npen0.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          */
/*                                                                       */
/*      NPEN0.c                                          1.9             */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      All                                                              */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains the PenSize 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"
#include "metmacs3.h"


/* Function PenSize sets the port's current pen size (thePort.pnSize) to
to the specified WIDTHX,HEIGHTY value, following X rules: any size from 1 on
up is acceptable as a width for a wide line; if either dimension is 0, then
the line is treated as a thin line. (X only supports circular pens, actually;
this is a superset.)  Also, in virtual mode, pen widths > 0 are never allowed
to become less than 1.

This routine smart links non-dashed square pen lines.
This routine smart links square pen PolyLine. */

void PenSize(short WIDTHX, short HEIGHTY)
{
	short grafErrValue;	/* error value */
	void mwLIT(void);
	void mwPolyLine(void);

	/* test for thin case, either size = 0 before scaling */
	if ((WIDTHX == 0) || (HEIGHTY == 0))
	{	/* set thin pen */
		if (gFlags & gfRgnOpen)	/* is region open? */
		{	/* region open and thin pen requested, set pen to 1,1 */
			WIDTHX = 1;
			HEIGHTY = 1;
			regPenFlags &= ~pnSizeFlg;	/* make CloseRegion restore thin pen */
		}
		else
		{
			thePort->pnFlags &= ~pnSizeFlg;	/* clear thick flag */
			grafPort.pnFlags &= ~pnSizeFlg;
			WIDTHX = 0;	/* update port pen size to 0,0 */
			HEIGHTY = 0;
			goto PS080;
		}
	}
	else
	{
		if (grafPort.portFlags & pfVirtual)	/* test if virtual coordinates */
		{	/* Virtual To Global size */
			V2GSIZE(WIDTHX, HEIGHTY, &WIDTHX, &HEIGHTY);
		}
	
		/* test if height or width less than 1 */
		if (WIDTHX < 1)
		{
			grafErrValue = c_PenSize +  c_BadSize;	/* bad size */
			nuGrafErr(grafErrValue);	/* report error */
			WIDTHX = 1;	/* width = 1 */
		}
		if (HEIGHTY < 1)
		{
			grafErrValue = c_PenSize +  c_BadSize;	/* bad size */
			nuGrafErr(grafErrValue);	/* report error */
			HEIGHTY = 1;	/* width = 1 */
		}
	}

	thePort->pnFlags |= pnSizeFlg;	/* set thick line flag */
	grafPort.pnFlags |= pnSizeFlg;
	regPenFlags |= pnSizeFlg;	/* make CloseRegion leave pen alone */

PS080:
	thePort->pnSize.X = WIDTHX;	/* update user port */
	thePort->pnSize.Y = HEIGHTY;
	grafPort.pnSize.X = WIDTHX;	/* update shadow port */
	grafPort.pnSize.Y = HEIGHTY;

	linePattIDV = (long) mwLIT;	/* smart link non-dashed square lines */
	SETLINESTYLE(grafPort.pnFlags);	/* refresh current line style vector */
	lineSqPolyIDV = (long) mwPolyLine;	/* smart link square pen PolyLine */

	return;
}