xypt5.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          */
/*                                                                       */
/*      XYPT5.c                                          1.9             */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      All                                                              */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains the MapPt 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"


/* Procedure MapPt maps the specified point, PT, within the source rectangle 
(srcR) to a similiarly located point within the destination rectangle (dstR).*/
void MapPt ( point * PT, rect * srcR , rect * dstR )
{
	
	short X, Y;
	short src_dltX, dst_dltX;
	short src_dltY, dst_dltY;
	
	dst_dltX = dstR->Xmax - dstR->Xmin;	
	
	src_dltX = srcR->Xmax - srcR->Xmin; 
	
	if ( src_dltX <= 0 )
	{
		return;
	}
	X = PT->X - srcR->Xmin;

	X = X * (dst_dltX / src_dltX) ;	

	PT->X = X + dstR->Xmin ;

    dst_dltY = dstR->Ymax - dstR->Ymin ; 

	src_dltY = srcR->Ymax - srcR->Ymin ; 
		
	if ( src_dltY <= 0)
	{
		return ;
	}

	
	Y = PT->Y - srcR->Ymin;
	Y = Y * (dst_dltY / src_dltY);

		
	
	PT->Y = Y + dstR->Ymin;
	return ;
}