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gimp/modules/colorsel_triangle.c

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/*
* colorsel_triangle module (C) 1999 Simon Budig <Simon.Budig@unix-ag.org>
* http://www.home.unix-ag.org/simon/gimp/colorsel.html
*
* 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.
*
* Ported to loadable colour selector interface by Austin Donnelly
* <austin@gimp.org>
*/
#include "config.h"
#include <stdlib.h>
#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpmath/gimpmath.h"
#include "gimpmodregister.h"
#include "libgimp/gimpcolorselector.h"
#include "libgimp/gimpmodule.h"
#include "libgimp/gimpintl.h"
/* prototypes */
static GtkWidget * colorsel_triangle_new (const GimpHSV *hsv,
const GimpRGB *rgb,
gboolean show_alpha,
GimpColorSelectorCallback callback,
gpointer callback_data,
gpointer *selector_data);
static void colorsel_triangle_free (gpointer selector_data);
static void colorsel_triangle_set_color (gpointer selector_data,
const GimpHSV *hsv,
const GimpRGB *rgb);
static void colorsel_xy_to_triangle_buf (const gint x,
const gint y,
const gdouble hue,
guchar *buf,
const gint sx,
const gint sy,
const gint vx,
const gint vy,
const gint hx,
const gint hy);
/* local methods */
static GimpColorSelectorMethods methods =
{
colorsel_triangle_new,
colorsel_triangle_free,
colorsel_triangle_set_color,
NULL /* set_channel */
};
static GimpModuleInfo info =
{
NULL,
N_("Painter-style color selector as a pluggable color selector"),
"Simon Budig <Simon.Budig@unix-ag.org>",
"v0.03",
"(c) 1999, released under the GPL",
"17 Jan 1999"
};
static const GtkTargetEntry targets[] =
{
{ "application/x-color", 0 }
};
#define COLORWHEELRADIUS (GIMP_COLOR_SELECTOR_SIZE / 2)
#define COLORTRIANGLERADIUS (COLORWHEELRADIUS - GIMP_COLOR_SELECTOR_BAR_SIZE)
#define PREVIEWSIZE (2 * COLORWHEELRADIUS + 1)
#define BGCOLOR 180
#define PREVIEW_MASK GDK_EXPOSURE_MASK | \
GDK_BUTTON_PRESS_MASK | \
GDK_BUTTON_RELEASE_MASK | \
GDK_BUTTON_MOTION_MASK
typedef enum
{
HUE = 0,
SATURATION,
VALUE,
RED,
GREEN,
BLUE,
ALPHA
} ColorSelectFillType;
struct _ColorSelect
{
GimpHSV hsv;
GimpRGB rgb;
gdouble oldsat;
gdouble oldval;
gint mode;
GtkWidget *preview;
GimpColorSelectorCallback callback;
gpointer data;
};
typedef struct _ColorSelect ColorSelect;
static GtkWidget * create_preview (ColorSelect *coldata);
static void update_previews (ColorSelect *coldata,
gboolean hue_changed);
/*************************************************************/
/* globaly exported init function */
G_MODULE_EXPORT GimpModuleStatus
module_init (GimpModuleInfo **inforet)
{
GimpColorSelectorID id;
#ifndef __EMX__
id = gimp_color_selector_register (_("Triangle"), "triangle.html", &methods);
#else
id = mod_color_selector_register (_("Triangle"), "triangle.html", &methods);
#endif
if (id)
{
info.shutdown_data = id;
*inforet = &info;
return GIMP_MODULE_OK;
}
else
{
return GIMP_MODULE_UNLOAD;
}
}
G_MODULE_EXPORT void
module_unload (gpointer shutdown_data,
GimpColorSelectorFinishedCB completed_cb,
gpointer completed_data)
{
#ifndef __EMX__
gimp_color_selector_unregister (shutdown_data, completed_cb, completed_data);
#else
mod_color_selector_unregister (shutdown_data, completed_cb, completed_data);
#endif
}
/*************************************************************/
/* methods */
static GtkWidget *
colorsel_triangle_new (const GimpHSV *hsv,
const GimpRGB *rgb,
gboolean show_alpha,
GimpColorSelectorCallback callback,
gpointer callback_data,
/* RETURNS: */
gpointer *selector_data)
{
ColorSelect *coldata;
GtkWidget *preview;
GtkWidget *frame;
GtkWidget *hbox;
GtkWidget *vbox;
coldata = g_new (ColorSelect, 1);
coldata->hsv = *hsv;
coldata->rgb = *rgb;
coldata->oldsat = 0;
coldata->oldval = 0;
coldata->mode = 0;
coldata->callback = callback;
coldata->data = callback_data;
preview = create_preview (coldata);
coldata->preview = preview;
update_previews (coldata, TRUE);
*selector_data = coldata;
vbox = gtk_vbox_new (FALSE, 0);
hbox = gtk_hbox_new (FALSE, 0);
gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, FALSE, 0);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_container_add (GTK_CONTAINER (frame), preview);
gtk_box_pack_start (GTK_BOX (hbox), frame, TRUE, FALSE, 0);
gtk_widget_show_all (vbox);
return vbox;
}
static void
colorsel_triangle_free (gpointer selector_data)
{
/* anything else needed to go? */
g_free (selector_data);
}
static void
colorsel_triangle_set_color (gpointer selector_data,
const GimpHSV *hsv,
const GimpRGB *rgb)
{
ColorSelect *coldata;
coldata = selector_data;
coldata->hsv = *hsv;
coldata->rgb = *rgb;
update_previews (coldata, TRUE);
}
/*************************************************************/
/* helper functions */
static void
update_previews (ColorSelect *coldata,
gint hue_changed)
{
GtkWidget *preview;
guchar buf[3 * PREVIEWSIZE];
gint x, y, k, r2, dx, col;
gint x0, y0;
gdouble hue, sat, val, atn;
gint hx,hy, sx,sy, vx,vy;
hue = (gdouble) coldata->hsv.h * 2 * G_PI;
/* Colored point (value = 1, saturation = 1) */
hx = RINT (sin (hue) * COLORTRIANGLERADIUS);
hy = RINT (cos (hue) * COLORTRIANGLERADIUS);
/* Black point (value = 0, saturation not important) */
sx = RINT (sin (hue - 2 * G_PI / 3) * COLORTRIANGLERADIUS);
sy = RINT (cos (hue - 2 * G_PI / 3) * COLORTRIANGLERADIUS);
/* White point (value = 1, saturation = 0) */
vx = RINT (sin (hue + 2 * G_PI / 3) * COLORTRIANGLERADIUS);
vy = RINT (cos (hue + 2 * G_PI / 3) * COLORTRIANGLERADIUS);
hue = coldata->hsv.h * 360.0;
preview = coldata->preview;
if (hue_changed)
{
for (y = COLORWHEELRADIUS; y >= -COLORWHEELRADIUS; y--)
{
dx = RINT (sqrt (fabs (COLORWHEELRADIUS * COLORWHEELRADIUS - y * y)));
for (x = -dx, k = 0; x <= dx; x++)
{
buf[k] = buf[k+1] = buf[k+2] = BGCOLOR;
r2 = (x * x) + (y * y);
if (r2 <= COLORWHEELRADIUS * COLORWHEELRADIUS)
{
if (r2 > COLORTRIANGLERADIUS * COLORTRIANGLERADIUS)
{
atn = atan2 (x, y);
if (atn < 0)
atn = atn + 2 * G_PI;
gimp_hsv_to_rgb4 (buf + k, atn / (2 * G_PI), 1, 1);
}
else
{
colorsel_xy_to_triangle_buf (x, y, hue, buf + k, hx, hy, sx, sy, vx, vy);
}
}
k += 3;
}
gtk_preview_draw_row (GTK_PREVIEW (preview), buf,
COLORWHEELRADIUS - dx,
COLORWHEELRADIUS - y, 2 * dx + 1);
}
/* marker in outer ring */
x0 = RINT (sin (hue * G_PI / 180) *
((gdouble) (COLORWHEELRADIUS - COLORTRIANGLERADIUS + 1) / 2 +
COLORTRIANGLERADIUS));
y0 = RINT (cos (hue * G_PI / 180) *
((gdouble) (COLORWHEELRADIUS - COLORTRIANGLERADIUS + 1) / 2 +
COLORTRIANGLERADIUS));
atn = atan2 (x0, y0);
if (atn < 0)
atn = atn + 2 * G_PI;
gimp_hsv_to_rgb4 (buf, atn / (2 * G_PI), 1, 1);
col = INTENSITY (buf[0], buf[1], buf[2]) > 127 ? 0 : 255;
for (y = y0 - 4 ; y <= y0 + 4 ; y++)
{
for (x = x0 - 4, k=0 ; x <= x0 + 4 ; x++)
{
r2 = (x - x0) * (x - x0) + (y - y0) * (y - y0);
if (r2 <= 20 && r2 >= 6)
{
buf[k] = buf[k+1] = buf[k+2] = col;
}
else
{
atn = atan2 (x, y);
if (atn < 0)
atn = atn + 2 * G_PI;
gimp_hsv_to_rgb4 (buf + k, atn / (2 * G_PI), 1, 1);
}
k += 3;
}
gtk_preview_draw_row (GTK_PREVIEW (preview), buf,
COLORWHEELRADIUS + x0 - 4,
COLORWHEELRADIUS - y, 9);
}
}
else
{
/* delete marker in triangle */
sat = coldata->oldsat;
val = coldata->oldval;
x0 = RINT (sx + (vx - sx) * val + (hx - vx) * sat * val);
y0 = RINT (sy + (vy - sy) * val + (hy - vy) * sat * val);
for (y = y0 - 4 ; y <= y0 + 4 ; y++)
{
for (x = x0 - 4, k=0 ; x <= x0 + 4 ; x++)
{
buf[k] = buf[k+1] = buf[k+2] = BGCOLOR;
r2 = (x - x0) * (x - x0) + (y - y0) * (y - y0);
if (x * x + y * y > COLORTRIANGLERADIUS * COLORTRIANGLERADIUS)
{
atn = atan2 (x, y);
if (atn < 0)
atn = atn + 2 * G_PI;
gimp_hsv_to_rgb4 (buf + k, atn / (2 * G_PI), 1, 1);
}
else
{
colorsel_xy_to_triangle_buf (x, y, hue, buf + k, hx, hy, sx, sy, vx, vy);
}
k += 3;
}
gtk_preview_draw_row (GTK_PREVIEW (preview), buf,
COLORWHEELRADIUS + x0 - 4,
COLORWHEELRADIUS - y, 9);
}
}
/* marker in triangle */
col = gimp_rgb_intensity (&coldata->rgb) > 0.5 ? 0 : 255;
sat = coldata->oldsat = coldata->hsv.s;
val = coldata->oldval = coldata->hsv.v;
x0 = RINT (sx + (vx - sx) * val + (hx - vx) * sat * val);
y0 = RINT (sy + (vy - sy) * val + (hy - vy) * sat * val);
for (y = y0 - 4 ; y <= y0 + 4 ; y++)
{
for (x = x0 - 4, k=0 ; x <= x0 + 4 ; x++)
{
buf[k] = buf[k+1] = buf[k+2] = BGCOLOR;
r2 = (x - x0) * (x - x0) + (y - y0) * (y - y0);
if (r2 <= 20 && r2 >= 6)
{
buf[k] = buf[k+1] = buf[k+2] = col;
}
else
{
if (x * x + y * y > COLORTRIANGLERADIUS * COLORTRIANGLERADIUS)
{
atn = atan2 (x, y);
if (atn < 0)
atn = atn + 2 * G_PI;
gimp_hsv_to_rgb4 (buf + k, atn / (2 * G_PI), 1, 1);
}
else
{
colorsel_xy_to_triangle_buf (x, y, hue, buf + k, hx, hy, sx, sy, vx, vy);
}
}
k += 3;
}
gtk_preview_draw_row (GTK_PREVIEW (preview), buf,
COLORWHEELRADIUS + x0 - 4,
COLORWHEELRADIUS - y, 9);
}
gtk_widget_draw (preview, NULL);
}
static void
colorsel_xy_to_triangle_buf (const gint x, const gint y,
const gdouble hue, guchar *buf,
const gint hx, const gint hy, /* colored point */
const gint sx, const gint sy, /* black point */
const gint vx, const gint vy) /* white point */
{
gdouble sat, val;
/*
* The value is 1 - (the distance from the H->V line).
* I forgot the linear algebra behind it...
*/
val = (gdouble) ( (x - sx) * (hy - vy) - (y - sy) * (hx - vx)) /
(gdouble) ((vx - sx) * (hy - vy) - (vy - sy) * (hx - vx));
if (val >= 0 && val<= 1)
{
if (abs (hy - vy) < abs (hx - vx))
{
sat = (val == 0 ? 0: ((gdouble) (x - sx - val * (vx - sx)) /
(val * (hx - vx))));
}
else
{
sat = (val == 0 ? 0: ((gdouble) (y - sy - val * (vy - sy)) /
(val * (hy - vy))));
}
/* Yes, this ugly 1.00*01 fixes some subtle rounding errors... */
if (sat >= 0 && sat <= 1.000000000000001)
gimp_hsv_to_rgb4 (buf, hue / 360, sat, val);
}
}
/*
* Color Preview
*/
static gint
color_selection_callback (GtkWidget *widget,
GdkEvent *event)
{
ColorSelect *coldata;
gint x,y, angle, mousex, mousey;
gdouble r;
gdouble hue, sat, val;
gint hx,hy, sx,sy, vx,vy;
coldata = g_object_get_data (G_OBJECT (widget), "colorselect");
switch (event->type)
{
case GDK_BUTTON_PRESS:
gtk_grab_add (widget);
x = event->button.x - COLORWHEELRADIUS - 1;
y = - event->button.y + COLORWHEELRADIUS + 1;
r = sqrt ((gdouble) (x * x + y * y));
angle = ((gint) RINT (atan2 (x, y) / G_PI * 180) + 360 ) % 360;
if ( /* r <= COLORWHEELRADIUS && */ r > COLORTRIANGLERADIUS)
coldata->mode = 1; /* Dragging in the Ring */
else
coldata->mode = 2; /* Dragging in the Triangle */
break;
case GDK_MOTION_NOTIFY:
x = event->motion.x - COLORWHEELRADIUS - 1;
y = - event->motion.y + COLORWHEELRADIUS + 1;
r = sqrt ((gdouble) (x * x + y * y));
angle = ((gint) RINT (atan2 (x, y) / G_PI * 180) + 360 ) % 360;
break;
case GDK_BUTTON_RELEASE:
coldata->mode = 0;
gtk_grab_remove (widget);
/* callback the user */
(* coldata->callback) (coldata->data,
&coldata->hsv,
&coldata->rgb);
return FALSE;
break;
default:
gtk_widget_get_pointer (widget, &x, &y);
x = x - COLORWHEELRADIUS - 1;
y = - y + COLORWHEELRADIUS + 1;
r = sqrt ((gdouble) (x * x + y * y));
angle = ((gint) RINT (atan2 (x, y) / G_PI * 180) + 360 ) % 360;
break;
}
gtk_widget_get_pointer (widget, &mousex, &mousey);
if ((event->type == GDK_MOTION_NOTIFY &&
(mousex != event->motion.x || mousey != event->motion.y)))
return FALSE;
if (coldata->mode == 1 ||
(r > COLORWHEELRADIUS &&
(abs (angle - coldata->hsv.h * 360.0) < 30 ||
abs (abs (angle - coldata->hsv.h * 360.0) - 360) < 30)))
{
coldata->hsv.h = angle / 360.0;
gimp_hsv_to_rgb (&coldata->hsv, &coldata->rgb);
update_previews (coldata, TRUE);
}
else
{
hue = coldata->hsv.h * 2 * G_PI;
hx = sin (hue) * COLORTRIANGLERADIUS;
hy = cos (hue) * COLORTRIANGLERADIUS;
sx = sin (hue - 2 * G_PI / 3) * COLORTRIANGLERADIUS;
sy = cos (hue - 2 * G_PI / 3) * COLORTRIANGLERADIUS;
vx = sin (hue + 2 * G_PI / 3) * COLORTRIANGLERADIUS;
vy = cos (hue + 2 * G_PI / 3) * COLORTRIANGLERADIUS;
hue = coldata->hsv.h * 360.0;
if ((x - sx) * vx + (y - sy) * vy < 0)
{
sat = 1;
val = ((gdouble) ( (x - sx) * (hx - sx) + (y - sy) * (hy - sy)))
/ ((hx - sx) * (hx - sx) + (hy - sy) * (hy - sy));
if (val < 0)
val = 0;
else if (val > 1)
val = 1;
}
else if ((x - sx) * hx + (y - sy) * hy < 0)
{
sat = 0;
val = ((gdouble) ( (x - sx) * (vx - sx) + (y - sy) * (vy - sy)))
/ ((vx - sx) * (vx - sx) + (vy - sy) * (vy - sy));
if (val < 0)
val = 0;
else if (val > 1)
val = 1;
}
else if ((x - hx) * sx + (y - hy) * sy < 0)
{
val = 1;
sat = ((gdouble) ( (x - vx) * (hx - vx) + (y - vy) * (hy - vy)))
/ ((hx - vx) * (hx - vx) + (hy - vy) * (hy - vy));
if (sat < 0)
sat = 0;
else if (sat > 1)
sat = 1;
}
else
{
val = (gdouble) ( (x - sx) * (hy - vy) - (y - sy) * (hx - vx))
/ (gdouble) ((vx - sx) * (hy - vy) - (vy - sy) * (hx - vx));
if (val <= 0)
{
val = 0;
sat = 0;
}
else
{
if (val > 1)
val = 1;
if (hy == vy)
sat = (gdouble) (x - sx - val * (vx - sx)) / (val * (gdouble) (hx - vx));
else
sat = (gdouble) (y - sy - val * (vy - sy)) / (val * (gdouble) (hy - vy));
if (sat < 0)
sat = 0;
else if (sat > 1)
sat = 1;
}
}
coldata->hsv.s = sat;
coldata->hsv.v = val;
gimp_hsv_to_rgb (&coldata->hsv, &coldata->rgb);
update_previews (coldata, FALSE);
}
/* callback the user */
(* coldata->callback) (coldata->data,
&coldata->hsv,
&coldata->rgb);
return FALSE;
}
static GtkWidget *
create_preview (ColorSelect *coldata)
{
GtkWidget *preview;
guchar buf[3 * PREVIEWSIZE];
gint i;
preview = gtk_preview_new (GTK_PREVIEW_COLOR);
gtk_preview_set_dither (GTK_PREVIEW (preview), GDK_RGB_DITHER_MAX);
gtk_widget_set_events (GTK_WIDGET (preview), PREVIEW_MASK );
gtk_preview_size (GTK_PREVIEW (preview), PREVIEWSIZE, PREVIEWSIZE);
g_object_set_data (G_OBJECT (preview), "colorselect", coldata);
g_signal_connect (G_OBJECT (preview), "motion_notify_event",
G_CALLBACK (color_selection_callback),
NULL);
g_signal_connect (G_OBJECT (preview), "button_press_event",
G_CALLBACK (color_selection_callback),
NULL);
g_signal_connect (G_OBJECT (preview), "button_release_event",
G_CALLBACK (color_selection_callback),
NULL);
for (i=0; i < 3 * PREVIEWSIZE; i += 3)
buf[i] = buf[i+1] = buf[i+2] = BGCOLOR;
for (i=0; i < PREVIEWSIZE; i++)
gtk_preview_draw_row (GTK_PREVIEW (preview), buf, 0, i, PREVIEWSIZE);
gtk_widget_draw (preview, NULL);
return preview;
}
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