poly4.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          */
/*                                                                       */
/*      POLY4.c                                          1.9             */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      All                                                              */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains the FillPoly & __mwFP 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"
#include "poly_4.h"


void __mwFP(void);

/* Function FillPoly fills the specified polygon(s) using one of the predefined
fill patterns specified by fpPATINDEX (0-31) in rasterOp "replace" transfer mode. */

void FillPoly(int POLYCNT, polyHead *POLYHDR, point *POLYPTS, int fpPATINDEX)
{
	short grafErrValue;	/* error value */

	if (grafPort.pnLevel < 0) return;/* nothing to do */
	if (POLYCNT <= 0) return;/* skip if no polygons */

	lclPOLYCNT = POLYCNT;	/* copy the input locally */
	lclPOLYHDR = POLYHDR;
	lclPOLYPTS = POLYPTS;

	if (fpPATINDEX  > 31)
	{
		grafErrValue = c_FillPoly +  c_BadPatt;
		nuGrafErr(grafErrValue);	/* report error */
		fpPATINDEX = 1;	/* default pattern */
	}

	grafBlit.blitRop = 0;	/* set up default blit record */ 
	grafBlit.blitPat = fpPATINDEX;

	__mwFP();	/* fill the polygon(s) */

	grafBlit.blitRop = grafPort.pnMode;	/* restore blit record */
	grafBlit.blitPat = grafPort.pnPat;

	return;
}


/* Function mwFP fills the polygon described by lclPOLYPTS, lclPOLYHDR,
and lclPOLYCNT. pnLevel lclPOLYCNT and must already have been checked
for being >= 0. */

void __mwFP(void)
{
	rect usrC;	/* clip rectangle in user coordinates */
	int polyHeadSize;	/* size of polygon header */
	int ptCnt;	/* number of points in the polygon */
	point *bgnPtAds;
	void FillPolygon(point *pointsparm, unsigned int npointsparm,
		int modeparm, int shape);

	/* set up the clip rectangle in user coordinates */
	usrC = ViewClip;

	if (globalLevel > 0)	/* already in global? */
	{
		G2UR(usrC, &usrC);	/* convert from global to user */
	}

	polyHeadSize = sizeof(polyHead);
	for (; lclPOLYCNT > 0; lclPOLYCNT--)
	{
		/* perform trivial clip rejection */
		if ((lclPOLYHDR->polyRect.Xmin <= usrC.Xmax) &&
			(lclPOLYHDR->polyRect.Xmax > usrC.Xmin) &&
			(lclPOLYHDR->polyRect.Ymin <= usrC.Ymax) &&
			(lclPOLYHDR->polyRect.Ymax > usrC.Ymin))
		{

			ptCnt = lclPOLYHDR->polyEnd - lclPOLYHDR->polyBgn;
			if (ptCnt <= 0)   break;
			ptCnt++;
			bgnPtAds = &lclPOLYPTS[lclPOLYHDR->polyBgn];	/* point to
							the start vertex for this polygon */
			/* draw the current polygon */
			FillPolygon(bgnPtAds, ptCnt, coordModeOrigin, cmplx);
		}

		lclPOLYHDR = lclPOLYHDR + polyHeadSize;
	}

	return;
}