135 lines
3.5 KiB
C
135 lines
3.5 KiB
C
/* @(#) writes a circle in a vasari file
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* @(#) The circle is centred in the middle of the file (xsize/2, ysize/2)
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* @(#) im must be a valid image
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* @(#) int im_circle(pim, cx, cy, radius, intensity)
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* @(#) IMAGE *pim;
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* @(#) int cx, cy, radius, intensity;
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* @(#)
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* @(#) Return -1 on error 0 on sucess.
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*
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* Copyright 1990, N. Dessipris.
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*
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* Author N. Dessipris
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* Written on 30/05/1990
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* Updated on:
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* 22/7/93 JC
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* - im_incheck() call added
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* 16/8/94 JC
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* - im_incheck() changed to im_makerw()
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* 5/12/06
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* - im_invalidate() after paint
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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 <string.h>
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#include <vips/vips.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_circle( IMAGE *im, int cx, int cy, int radius, int intensity)
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{
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PEL *start;
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int size = 0;
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int x, y, d, offset;
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if( im_rwcheck( im ) )
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return( -1 );
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/* Check args */
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if ( (im->data == NULL)||(im->BandFmt != IM_BANDFMT_UCHAR)||(im->Bands != 1)
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||(im->Bbits != IM_BBITS_BYTE) )
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{
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im_errormsg("im_circle: unable to write input image");
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return(-1);
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}
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if ((intensity > 255)||(intensity <= 0))
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{
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im_errormsg("im_circle: intensity between 0 and 255");
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return(-1);
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}
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/* Check if circle fits into image */
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if ( ((radius+cy)> im->Ysize - 1) || ((cy-radius)< 0 ) ||
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((radius+cx)> im->Xsize - 1) || ((cx-radius) < 0 ) )
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{
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im_errormsg("im_circle: The circle doesnot fit in image");
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return(-1);
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}
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/* Draw the circle */
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size = im->Xsize;
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start = (PEL*)im->data;
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offset = cy * im->Xsize + cx; /* point at the center of the circle */
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x = 0;
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y = radius;
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d = 3 - 2 * radius;
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while ( x < y )
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{
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*(start + offset + size * y + x) = (PEL)intensity;
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*(start + offset + size * x + y) = (PEL)intensity;
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*(start + offset + size * y - x) = (PEL)intensity;
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*(start + offset + size * x - y) = (PEL)intensity;
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*(start + offset - size * y - x) = (PEL)intensity;
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*(start + offset - size * x - y) = (PEL)intensity;
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*(start + offset - size * y + x) = (PEL)intensity;
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*(start + offset - size * x + y) = (PEL)intensity;
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if (d < 0 )
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d += ( 4 * x + 6 );
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else
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{
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d += ( 4 * ( x - y ) + 10 );
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y--;
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}
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x++;
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}
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if ( x== y )
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{
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*(start + offset + size * y + x) = (PEL)intensity;
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*(start + offset + size * x + y) = (PEL)intensity;
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*(start + offset + size * y - x) = (PEL)intensity;
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*(start + offset + size * x - y) = (PEL)intensity;
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*(start + offset - size * y - x) = (PEL)intensity;
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*(start + offset - size * x - y) = (PEL)intensity;
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*(start + offset - size * y + x) = (PEL)intensity;
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*(start + offset - size * x + y) = (PEL)intensity;
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}
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im_invalidate( im );
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return(0);
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}
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