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/*
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This is a plug-in for the GIMP.
*
* Colormap-Rotation plug-in. Exchanges two color ranges.
*
* Copyright (C) 1999 Sven Anders (anderss@fmi.uni-passau.de)
* Based on code from Pavel Grinfeld (pavel@ml.com)
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*----------------------------------------------------------------------------
* Change log:
*
* Version 2.0, 04 April 1999.
* Nearly complete rewrite, made plug-in stable.
* (Works with GIMP 1.1 and GTK+ 1.2)
*
* Version 1.0, 27 March 1997.
* Initial (unstable) release by Pavel Grinfeld
*
*----------------------------------------------------------------------------*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "rcm.h"
#include "rcm_misc.h"
#include "rcm_dialog.h"
#include "rcm_gdk.h"
/* Global variables */
GdkGC *xor_gc;
/* Drawing routines */
void
rcm_draw_little_circle (GdkWindow *window,
GdkGC *color,
gfloat hue,
gfloat satur)
{
gint x,y;
x = GRAY_CENTER + GRAY_RADIUS * satur * cos(hue);
y = GRAY_CENTER - GRAY_RADIUS * satur * sin(hue);
gdk_draw_arc (window, color, 0, x-LITTLE_RADIUS, y-LITTLE_RADIUS,
2*LITTLE_RADIUS, 2*LITTLE_RADIUS, 0, 360*64);
}
void
rcm_draw_large_circle (GdkWindow *window,
GdkGC *color,
gfloat gray_sat)
{
gint x, y;
x = GRAY_CENTER;
y = GRAY_CENTER;
gdk_draw_arc (window, color, 0,
ROUND (x - GRAY_RADIUS * gray_sat),
ROUND (y - GRAY_RADIUS * gray_sat),
ROUND (2 * GRAY_RADIUS * gray_sat),
ROUND (2 * GRAY_RADIUS * gray_sat),
0, 360 * 64);
}
#define REL .8
#define DEL .1
#define TICK 10
void
rcm_draw_arrows (GdkWindow *window,
GdkGC *color,
RcmAngle *angle)
{
gint dist;
gfloat alpha, beta, cw_ccw, delta;
alpha = angle->alpha;
beta = angle->beta;
cw_ccw = angle->cw_ccw;
delta = angle_mod_2PI(beta - alpha);
if (cw_ccw == -1)
delta = delta - TP;
gdk_draw_line (window,color,
CENTER,
CENTER,
ROUND (CENTER + RADIUS * cos(alpha)),
ROUND (CENTER - RADIUS * sin(alpha)));
gdk_draw_line( window,color,
CENTER + RADIUS * cos(alpha),
CENTER - RADIUS * sin(alpha),
ROUND (CENTER + RADIUS * REL * cos(alpha - DEL)),
ROUND (CENTER - RADIUS * REL * sin(alpha - DEL)));
gdk_draw_line (window,color,
CENTER + RADIUS * cos(alpha),
CENTER - RADIUS * sin(alpha),
ROUND (CENTER + RADIUS * REL * cos(alpha + DEL)),
ROUND (CENTER - RADIUS * REL * sin(alpha + DEL)));
gdk_draw_line (window,color,
CENTER,
CENTER,
ROUND (CENTER + RADIUS * cos(beta)),
ROUND (CENTER - RADIUS * sin(beta)));
gdk_draw_line (window,color,
CENTER + RADIUS * cos(beta),
CENTER - RADIUS * sin(beta),
ROUND (CENTER + RADIUS * REL * cos(beta - DEL)),
ROUND (CENTER - RADIUS * REL * sin(beta - DEL)));
gdk_draw_line (window,color,
CENTER + RADIUS * cos(beta),
CENTER - RADIUS * sin(beta),
ROUND (CENTER + RADIUS * REL * cos(beta + DEL)),
ROUND (CENTER - RADIUS * REL * sin(beta + DEL)));
dist = RADIUS * EACH_OR_BOTH;
gdk_draw_line (window,color,
CENTER + dist * cos(beta),
CENTER - dist * sin(beta),
ROUND (CENTER + dist * cos(beta) + cw_ccw * TICK * sin(beta)),
ROUND (CENTER - dist * sin(beta) + cw_ccw * TICK * cos(beta)));
alpha *= 180 * 64 / G_PI;
delta *= 180 * 64 / G_PI;
gdk_draw_arc (window, color, 0, CENTER - dist, CENTER - dist,
2*dist, 2*dist, alpha, delta);
}
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