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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 <string.h>
#include <gtk/gtk.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpmodule/gimpmodule.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "libgimp/libgimp-intl.h"
#define BGCOLOR 180
#define MINIMUM_SIZE 48
#define PREVIEW_MASK (GDK_BUTTON_PRESS_MASK | \
GDK_BUTTON_RELEASE_MASK | \
GDK_BUTTON_MOTION_MASK )
#define COLORSEL_TYPE_TRIANGLE (colorsel_triangle_get_type ())
#define COLORSEL_TRIANGLE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), COLORSEL_TYPE_TRIANGLE, ColorselTriangle))
#define COLORSEL_TRIANGLE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), COLORSEL_TYPE_TRIANGLE, ColorselTriangleClass))
#define COLORSEL_IS_TRIANGLE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), COLORSEL_TYPE_TRIANGLE))
#define COLORSEL_IS_TRIANGLE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), COLORSEL_TYPE_TRIANGLE))
typedef struct _ColorselTriangle ColorselTriangle;
typedef struct _ColorselTriangleClass ColorselTriangleClass;
struct _ColorselTriangle
{
GimpColorSelector parent_instance;
gdouble oldsat;
gdouble oldval;
gint mode;
GtkWidget *preview;
gint wheelradius;
gint triangleradius;
};
struct _ColorselTriangleClass
{
GimpColorSelectorClass parent_class;
};
GType colorsel_triangle_get_type (void);
static void colorsel_triangle_set_color (GimpColorSelector *selector,
const GimpRGB *rgb,
const GimpHSV *hsv);
static void colorsel_xy_to_triangle_buf (gint x,
gint y,
gdouble hue,
guchar *buf,
gint sx,
gint sy,
gint vx,
gint vy,
gint hx,
gint hy);
static GtkWidget * colorsel_triangle_create_preview (ColorselTriangle *triangle);
static void colorsel_triangle_update_preview (ColorselTriangle *triangle);
static void colorsel_triangle_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
ColorselTriangle *triangle);
static gboolean colorsel_triangle_event (GtkWidget *widget,
GdkEvent *event,
ColorselTriangle *triangle);
static const GimpModuleInfo colorsel_triangle_info =
{
GIMP_MODULE_ABI_VERSION,
N_("Painter-style triangle 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 }
};
G_DEFINE_DYNAMIC_TYPE (ColorselTriangle, colorsel_triangle,
GIMP_TYPE_COLOR_SELECTOR)
G_MODULE_EXPORT const GimpModuleInfo *
gimp_module_query (GTypeModule *module)
{
return &colorsel_triangle_info;
}
G_MODULE_EXPORT gboolean
gimp_module_register (GTypeModule *module)
{
colorsel_triangle_register_type (module);
return TRUE;
}
static void
colorsel_triangle_class_init (ColorselTriangleClass *klass)
{
GimpColorSelectorClass *selector_class = GIMP_COLOR_SELECTOR_CLASS (klass);
selector_class->name = _("Triangle");
selector_class->help_id = "gimp-colorselector-triangle";
selector_class->stock_id = GIMP_STOCK_COLOR_TRIANGLE;
selector_class->set_color = colorsel_triangle_set_color;
}
static void
colorsel_triangle_class_finalize (ColorselTriangleClass *klass)
{
}
static void
colorsel_triangle_init (ColorselTriangle *triangle)
{
GtkWidget *frame;
triangle->oldsat = 0;
triangle->oldval = 0;
triangle->mode = 0;
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (triangle), frame, TRUE, TRUE, 0);
gtk_widget_show (frame);
triangle->preview = colorsel_triangle_create_preview (triangle);
gtk_container_add (GTK_CONTAINER (frame), triangle->preview);
gtk_widget_set_size_request (triangle->preview, MINIMUM_SIZE, MINIMUM_SIZE);
gtk_widget_show (triangle->preview);
}
static void
colorsel_triangle_set_color (GimpColorSelector *selector,
const GimpRGB *rgb,
const GimpHSV *hsv)
{
ColorselTriangle *triangle = COLORSEL_TRIANGLE (selector);
colorsel_triangle_update_preview (triangle);
}
static GtkWidget *
colorsel_triangle_create_preview (ColorselTriangle *triangle)
{
GtkWidget *preview = gimp_preview_area_new ();
gtk_widget_add_events (preview, PREVIEW_MASK);
g_signal_connect (preview, "motion-notify-event",
G_CALLBACK (colorsel_triangle_event),
triangle);
g_signal_connect (preview, "button-press-event",
G_CALLBACK (colorsel_triangle_event),
triangle);
g_signal_connect (preview, "button-release-event",
G_CALLBACK (colorsel_triangle_event),
triangle);
g_signal_connect (preview, "size-allocate",
G_CALLBACK (colorsel_triangle_size_allocate),
triangle);
return preview;
}
static void
colorsel_triangle_update_preview (ColorselTriangle *triangle)
{
GimpColorSelector *selector = GIMP_COLOR_SELECTOR (triangle);
guchar *preview_buf, *buf;
gint x, y, k, r2, dx, col;
gint x0, y0;
gdouble hue, sat, val, atn;
gint hx, hy;
gint sx, sy;
gint vx, vy;
gint width, height, size;
gint d;
width = GIMP_PREVIEW_AREA (triangle->preview)->width;
height = GIMP_PREVIEW_AREA (triangle->preview)->height;
/* return gracefully if the widget is not yet configured or too small */
if (width < MINIMUM_SIZE || height < MINIMUM_SIZE)
return;
triangle->wheelradius = MIN (width - 1, height - 1) / 2;
triangle->triangleradius = RINT (0.8 * triangle->wheelradius);
size = triangle->wheelradius * 2 + 1;
preview_buf = g_new (guchar, 3 * size * size);
buf = g_new (guchar, 3 * size);
memset (preview_buf, BGCOLOR, 3 * size * size);
hue = (gdouble) selector->hsv.h * 2 * G_PI;
/* Colored point (value = 1, saturation = 1) */
hx = RINT (cos (hue) * triangle->triangleradius);
hy = RINT (sin (hue) * triangle->triangleradius);
/* Black point (value = 0, saturation not important) */
sx = RINT (cos (hue + 2 * G_PI / 3) * triangle->triangleradius);
sy = RINT (sin (hue + 2 * G_PI / 3) * triangle->triangleradius);
/* White point (value = 1, saturation = 0) */
vx = RINT (cos (hue - 2 * G_PI / 3) * triangle->triangleradius);
vy = RINT (sin (hue - 2 * G_PI / 3) * triangle->triangleradius);
hue = selector->hsv.h * 360.0;
for (y = triangle->wheelradius; y >= -triangle->wheelradius; y--)
{
dx = RINT (sqrt (fabs (SQR (triangle->wheelradius) - SQR (y))));
for (x = -dx, k = 0; x <= dx; x++)
{
buf[k] = buf[k+1] = buf[k+2] = BGCOLOR;
r2 = SQR (x) + SQR (y);
if (r2 <= SQR (triangle->wheelradius))
{
if (r2 > SQR (triangle->triangleradius))
{
atn = atan2 (y, x);
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;
}
memcpy (preview_buf + ((triangle->wheelradius - y) * size +
triangle->wheelradius - dx ) * 3,
buf,
3 * (2 * dx + 1));
}
/* marker in outer ring */
x0 = RINT (cos (hue * G_PI / 180) *
((gdouble) (triangle->wheelradius -
triangle->triangleradius + 1) / 2 +
triangle->triangleradius));
y0 = RINT (sin (hue * G_PI / 180) *
((gdouble) (triangle->wheelradius -
triangle->triangleradius + 1) / 2 +
triangle->triangleradius));
atn = atan2 (y0, x0);
if (atn < 0)
atn = atn + 2 * G_PI;
gimp_hsv_to_rgb4 (buf, atn / (2 * G_PI), 1, 1);
col = GIMP_RGB_LUMINANCE (buf[0], buf[1], buf[2]) > 127 ? 0 : 255;
d = CLAMP (triangle->wheelradius / 16, 2, 4);
for (y = y0 - d ; y <= y0 + d ; y++)
{
for (x = x0 - d, k = 0; x <= x0 + d ; x++)
{
r2 = SQR (x - x0) + SQR (y - y0);
if ((r2 <= d * 5) && (r2 >= d + 2))
{
buf[k] = buf[k+1] = buf[k+2] = col;
}
else
{
atn = atan2 (y, x);
if (atn < 0)
atn = atn + 2 * G_PI;
gimp_hsv_to_rgb4 (buf + k, atn / (2 * G_PI), 1, 1);
}
k += 3;
}
memcpy (preview_buf + ((triangle->wheelradius - y) * size +
triangle->wheelradius + x0 - d) * 3,
buf,
(2 * d + 1) * 3);
}
/* marker in triangle */
col = gimp_rgb_luminance (&selector->rgb) > 0.5 ? 0 : 255;
sat = triangle->oldsat = selector->hsv.s;
val = triangle->oldval = selector->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 = SQR (x - x0) + SQR (y - y0);
if (r2 <= 20 && r2 >= 6)
{
buf[k] = buf[k+1] = buf[k+2] = col;
}
else
{
if (SQR (x) + SQR (y) > SQR (triangle->triangleradius))
{
atn = atan2 (y, x);
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;
}
memcpy (preview_buf + ((triangle->wheelradius - y) * size +
triangle->wheelradius + x0 - 4) * 3,
buf,
9 * 3);
}
gimp_preview_area_draw (GIMP_PREVIEW_AREA (triangle->preview),
(width - size) / 2,
(height - size) / 2,
size,
size,
GIMP_RGB_IMAGE,
preview_buf,
3 * size);
g_free (buf);
g_free (preview_buf);
}
static void
colorsel_xy_to_triangle_buf (gint x,
gint y,
gdouble hue,
guchar *buf,
gint hx,
gint hy, /* colored point */
gint sx,
gint sy, /* black point */
gint vx,
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);
}
}
static void
colorsel_triangle_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
ColorselTriangle *triangle)
{
gimp_preview_area_fill (GIMP_PREVIEW_AREA (widget),
0, 0, allocation->width, allocation->height,
BGCOLOR, BGCOLOR, BGCOLOR);
colorsel_triangle_update_preview (triangle);
}
static gboolean
colorsel_triangle_event (GtkWidget *widget,
GdkEvent *event,
ColorselTriangle *triangle)
{
GimpColorSelector *selector = GIMP_COLOR_SELECTOR (triangle);
gint x, y, angle;
gdouble r;
gdouble hue, sat, val;
gint hx, hy;
gint sx, sy;
gint vx, vy;
gint width, height;
width = GIMP_PREVIEW_AREA (triangle->preview)->width;
height = GIMP_PREVIEW_AREA (triangle->preview)->height;
/* return gracefully if the widget is not yet configured or too small */
if (width < MINIMUM_SIZE || height < MINIMUM_SIZE)
return FALSE;
switch (event->type)
{
case GDK_BUTTON_PRESS:
gtk_grab_add (widget);
x = event->button.x - (width - 1) / 2 - 1;
y = - event->button.y + (height - 1) / 2 + 1;
r = sqrt ((gdouble) (SQR (x) + SQR (y)));
angle = ((gint) RINT (atan2 (y, x) / G_PI * 180) + 360 ) % 360;
if ( /* r <= triangle->wheelradius && */ r > triangle->triangleradius)
triangle->mode = 1; /* Dragging in the Ring */
else
triangle->mode = 2; /* Dragging in the Triangle */
break;
case GDK_MOTION_NOTIFY:
gtk_widget_get_pointer (widget, &x, &y);
if (x != event->motion.x || y != event->motion.y)
return FALSE;
x = x - (width - 1) / 2 - 1;
y = - y + (height - 1) / 2 + 1;
r = sqrt ((gdouble) (SQR (x) + SQR (y)));
angle = ((gint) RINT (atan2 (y, x) / G_PI * 180) + 360 ) % 360;
break;
case GDK_BUTTON_RELEASE:
triangle->mode = 0;
gtk_grab_remove (widget);
/* callback the user */
gimp_color_selector_color_changed (GIMP_COLOR_SELECTOR (triangle));
return FALSE;
default:
return FALSE;
}
if (triangle->mode == 1 ||
(r > triangle->wheelradius &&
(abs (angle - selector->hsv.h * 360.0) < 30 ||
abs (abs (angle - selector->hsv.h * 360.0) - 360) < 30)))
{
selector->hsv.h = angle / 360.0;
gimp_hsv_to_rgb (&selector->hsv, &selector->rgb);
colorsel_triangle_update_preview (triangle);
}
else
{
hue = selector->hsv.h * 2 * G_PI;
hx = cos (hue) * triangle->triangleradius;
hy = sin (hue) * triangle->triangleradius;
sx = cos (hue + 2 * G_PI / 3) * triangle->triangleradius;
sy = sin (hue + 2 * G_PI / 3) * triangle->triangleradius;
vx = cos (hue - 2 * G_PI / 3) * triangle->triangleradius;
vy = sin (hue - 2 * G_PI / 3) * triangle->triangleradius;
hue = selector->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;
}
}
selector->hsv.s = sat;
selector->hsv.v = val;
gimp_hsv_to_rgb (&selector->hsv, &selector->rgb);
colorsel_triangle_update_preview (triangle);
}
/* callback the user */
gimp_color_selector_color_changed (GIMP_COLOR_SELECTOR (triangle));
return FALSE;
}
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