86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
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/* @(#) Function which averages the difference x_secondary[] - x_reference[]
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* @(#) and y_secondary[] - y_reference[] of the structure points;
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* @(#) The rounded integer result is returnd into dx, dy
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* @(#) No IMAGES are involved in this function.
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* @(#)
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* @(#) int im_avgdxdy( points, dx, dy )
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* @(#) TIE_POINTS *points;
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* @(#) int *dx, *dy;
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* @(#)
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* @(#) Returns 0 on sucess and -1 on error.
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*
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* Copyright: 1990, N. Dessipris.
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*
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* Author: Nicos Dessipris
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* Written on: 20/12/1990
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* Modified on : 18/04/1991
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdio.h>
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#include <math.h>
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#include <vips/vips.h>
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#include "mosaic.h"
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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int
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im__avgdxdy( TIE_POINTS *points, int *dx, int *dy )
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{
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int sumdx, sumdy;
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int i;
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if( points->nopoints == 0 ) {
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im_errormsg( "im_avgdxdy: no points to average" );
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return( -1 );
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}
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/* Lots of points.
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*/
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sumdx = 0;
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sumdy = 0;
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for( i = 0; i < points->nopoints; i++ ) {
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sumdx += points->x_secondary[i] - points->x_reference[i];
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sumdy += points->y_secondary[i] - points->y_reference[i];
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}
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*dx = IM_RINT( (double) sumdx / (double) points->nopoints );
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*dy = IM_RINT( (double) sumdy / (double) points->nopoints );
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return( 0 );
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}
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