bezr6.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          */
/*                                                                       */
/*      BEZR6.c                                          1.9             */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      All                                                              */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains the mwBezCount 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 mwBezCount computes  and returns the number of points
needed to interpolate a series of Bezier curves. */

int mwBezCount(point *PTS, int PTCNT)
{
	int mwBezDepth(point *PTS);
	int i;	/* work variables */
	int j;
	int numPts;	/* number of interpolation points */
	point tP[4];	/* temporary bezier control */
	int bzDepth;

	numPts = 1;	/* starting point */

	/* Compute number of points for bezier approximation */
	for (i = 0; i < (PTCNT - 1); i += 3)
	{
		for (j = 0; j < 4; j++)	/* Process one curve at a time */
		{ 
			/* copy and convert control points to global */
			if (globalLevel > 0)
			{
				U2GP(PTS[i + j].X, PTS[i + j].Y, &tP[j].X, &tP[j].Y, 1);
			}
			else
			{
				tP[j]= PTS[i + j];
			}
		}
		bzDepth = mwBezDepth((point *)&tP);
		numPts += (1 << bzDepth);
	}

	return(numPts);
}