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/*
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This is a plug-in for 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 3 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, see <http://www.gnu.org/licenses/>.
*/
/*----------------------------------------------------------------------------
* 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 <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "color-rotate.h"
#include "color-rotate-utils.h"
#include "color-rotate-dialog.h"
#include "color-rotate-draw.h"
/* Drawing routines */
void
color_rotate_draw_little_circle (cairo_t *cr,
gfloat hue,
gfloat satur)
{
gint x, y;
x = GRAY_CENTER + GRAY_RADIUS * satur * cos(hue);
y = GRAY_CENTER - GRAY_RADIUS * satur * sin(hue);
cairo_new_sub_path (cr);
cairo_arc (cr, x, y, LITTLE_RADIUS, 0, 2 * G_PI);
cairo_set_line_width (cr, 3.0);
cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.6);
cairo_stroke_preserve (cr);
cairo_set_line_width (cr, 1.0);
cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.8);
cairo_stroke (cr);
}
void
color_rotate_draw_large_circle (cairo_t *cr,
gfloat gray_sat)
{
gint x, y;
x = GRAY_CENTER;
y = GRAY_CENTER;
cairo_new_sub_path (cr);
cairo_arc (cr, x, y, GRAY_RADIUS * gray_sat, 0, 2 * G_PI);
cairo_set_line_width (cr, 3.0);
cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.6);
cairo_stroke_preserve (cr);
cairo_set_line_width (cr, 1.0);
cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.8);
cairo_stroke (cr);
}
#define REL 0.8
#define DEL 0.1
#define TICK 10
void
color_rotate_draw_arrows (cairo_t *cr,
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;
cairo_move_to (cr, CENTER, CENTER);
cairo_line_to (cr,
ROUND (CENTER + RADIUS * cos (alpha)),
ROUND (CENTER - RADIUS * sin (alpha)));
cairo_move_to (cr,
CENTER + RADIUS * cos (alpha),
CENTER - RADIUS * sin (alpha));
cairo_line_to (cr,
ROUND (CENTER + RADIUS * REL * cos (alpha - DEL)),
ROUND (CENTER - RADIUS * REL * sin (alpha - DEL)));
cairo_move_to (cr,
CENTER + RADIUS * cos (alpha),
CENTER - RADIUS * sin (alpha));
cairo_line_to (cr,
ROUND (CENTER + RADIUS * REL * cos (alpha + DEL)),
ROUND (CENTER - RADIUS * REL * sin (alpha + DEL)));
cairo_move_to (cr,
CENTER,
CENTER);
cairo_line_to (cr,
ROUND (CENTER + RADIUS * cos (beta)),
ROUND (CENTER - RADIUS * sin (beta)));
cairo_move_to (cr,
CENTER + RADIUS * cos (beta),
CENTER - RADIUS * sin (beta));
cairo_line_to (cr,
ROUND (CENTER + RADIUS * REL * cos (beta - DEL)),
ROUND (CENTER - RADIUS * REL * sin (beta - DEL)));
cairo_move_to (cr,
CENTER + RADIUS * cos (beta),
CENTER - RADIUS * sin (beta));
cairo_line_to (cr,
ROUND (CENTER + RADIUS * REL * cos (beta + DEL)),
ROUND (CENTER - RADIUS * REL * sin (beta + DEL)));
dist = RADIUS * EACH_OR_BOTH;
cairo_move_to (cr,
CENTER + dist * cos (beta),
CENTER - dist * sin (beta));
cairo_line_to (cr,
ROUND (CENTER + dist * cos(beta) + cw_ccw * TICK * sin (beta)),
ROUND (CENTER - dist * sin(beta) + cw_ccw * TICK * cos (beta)));
cairo_new_sub_path (cr);
if (cw_ccw > 0)
{
cairo_arc_negative (cr,
CENTER,
CENTER,
dist,
-alpha,
-beta);
}
else
{
cairo_arc (cr,
CENTER,
CENTER,
dist,
-alpha,
-beta);
}
cairo_set_line_width (cr, 3.0);
cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.6);
cairo_stroke_preserve (cr);
cairo_set_line_width (cr, 1.0);
cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.8);
cairo_stroke (cr);
}