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gimp/modules/color-selector-water.c

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/* Watercolor color_select_module, Raph Levien <raph@acm.org>, February 1998
*
* Ported to loadable color-selector, Sven Neumann <sven@gimp.org>, May 1999
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.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 COLORSEL_TYPE_WATER (colorsel_water_get_type ())
#define COLORSEL_WATER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), COLORSEL_TYPE_WATER, ColorselWater))
#define COLORSEL_WATER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), COLORSEL_TYPE_WATER, ColorselWaterClass))
#define COLORSEL_IS_WATER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), COLORSEL_TYPE_WATER))
#define COLORSEL_IS_WATER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), COLORSEL_TYPE_WATER))
typedef struct _ColorselWater ColorselWater;
typedef struct _ColorselWaterClass ColorselWaterClass;
struct _ColorselWater
{
GimpColorSelector parent_instance;
gdouble last_x;
gdouble last_y;
gfloat pressure_adjust;
guint32 motion_time;
};
struct _ColorselWaterClass
{
GimpColorSelectorClass parent_class;
};
GType colorsel_water_get_type (void);
static void select_area_expose (GtkWidget *widget,
GdkEventExpose *event);
static gboolean button_press_event (GtkWidget *widget,
GdkEventButton *event,
ColorselWater *water);
static gboolean motion_notify_event (GtkWidget *widget,
GdkEventMotion *event,
ColorselWater *water);
static gboolean proximity_out_event (GtkWidget *widget,
GdkEventProximity *event,
ColorselWater *water);
static void pressure_adjust_update (GtkAdjustment *adj,
ColorselWater *water);
static const GimpModuleInfo colorsel_water_info =
{
GIMP_MODULE_ABI_VERSION,
N_("Watercolor style color selector"),
"Raph Levien <raph@acm.org>, Sven Neumann <sven@gimp.org>",
"v0.4",
"released under the GPL",
"1998-2006"
};
static const GtkTargetEntry targets[] =
{
{ "application/x-color", 0 }
};
G_DEFINE_DYNAMIC_TYPE (ColorselWater, colorsel_water,
GIMP_TYPE_COLOR_SELECTOR)
G_MODULE_EXPORT const GimpModuleInfo *
gimp_module_query (GTypeModule *module)
{
return &colorsel_water_info;
}
G_MODULE_EXPORT gboolean
gimp_module_register (GTypeModule *module)
{
colorsel_water_register_type (module);
return TRUE;
}
static void
colorsel_water_class_init (ColorselWaterClass *klass)
{
GimpColorSelectorClass *selector_class = GIMP_COLOR_SELECTOR_CLASS (klass);
selector_class->name = _("Watercolor");
selector_class->help_id = "gimp-colorselector-watercolor";
selector_class->stock_id = GIMP_STOCK_TOOL_PAINTBRUSH;
}
static void
colorsel_water_class_finalize (ColorselWaterClass *klass)
{
}
static void
colorsel_water_init (ColorselWater *water)
{
GtkWidget *hbox;
GtkWidget *area;
GtkWidget *frame;
GtkObject *adj;
GtkWidget *scale;
water->pressure_adjust = 1.0;
hbox = gtk_hbox_new (FALSE, 2);
gtk_box_pack_start (GTK_BOX (water), hbox, TRUE, TRUE, 0);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (hbox), frame, TRUE, TRUE, 0);
area = gtk_drawing_area_new ();
gtk_container_add (GTK_CONTAINER (frame), area);
g_signal_connect (area, "expose-event",
G_CALLBACK (select_area_expose),
NULL);
/* Event signals */
g_signal_connect (area, "motion-notify-event",
G_CALLBACK (motion_notify_event),
water);
g_signal_connect (area, "button-press-event",
G_CALLBACK (button_press_event),
water);
g_signal_connect (area, "proximity-out-event",
G_CALLBACK (proximity_out_event),
water);
gtk_widget_add_events (area,
GDK_LEAVE_NOTIFY_MASK |
GDK_BUTTON_PRESS_MASK |
GDK_KEY_PRESS_MASK |
GDK_POINTER_MOTION_MASK |
GDK_POINTER_MOTION_HINT_MASK |
GDK_PROXIMITY_OUT_MASK);
/* The following call enables tracking and processing of extension
* events for the drawing area
*/
gtk_widget_set_extension_events (area, GDK_EXTENSION_EVENTS_ALL);
gtk_widget_grab_focus (area);
adj = gtk_adjustment_new (200.0 - water->pressure_adjust * 100.0,
0.0, 200.0, 1.0, 1.0, 0.0);
g_signal_connect (adj, "value-changed",
G_CALLBACK (pressure_adjust_update),
water);
scale = gtk_vscale_new (GTK_ADJUSTMENT (adj));
gtk_scale_set_digits (GTK_SCALE (scale), 0);
gtk_scale_set_draw_value (GTK_SCALE (scale), FALSE);
gimp_help_set_help_data (scale, _("Pressure"), NULL);
gtk_box_pack_start (GTK_BOX (hbox), scale, FALSE, FALSE, 0);
gtk_widget_show_all (hbox);
}
static gdouble
calc (gdouble x,
gdouble y,
gdouble angle)
{
gdouble s = 2.0 * sin (angle * G_PI / 180.0) * 256.0;
gdouble c = 2.0 * cos (angle * G_PI / 180.0) * 256.0;
return 128 + (x - 0.5) * c - (y - 0.5) * s;
}
static void
select_area_expose (GtkWidget *widget,
GdkEventExpose *event)
{
GtkStyle *style = gtk_widget_get_style (widget);
gdouble width = widget->allocation.width;
gdouble height = widget->allocation.height;
gdouble dx = 1.0 / width;
gdouble dy = 1.0 / height;
guchar *buf = g_alloca (3 * event->area.width * event->area.height);
guchar *dest = buf;
gdouble y;
gint i, j;
for (j = 0, y = event->area.y / height; j < event->area.height; j++, y += dy)
{
guchar *d = dest;
gdouble r = calc (0, y, 0);
gdouble g = calc (0, y, 120);
gdouble b = calc (0, y, 240);
gdouble dr = calc (dx, y, 0) - r;
gdouble dg = calc (dx, y, 120) - g;
gdouble db = calc (dx, y, 240) - b;
r += event->area.x * dr;
g += event->area.x * dg;
b += event->area.x * db;
for (i = 0; i < event->area.width; i++)
{
d[0] = CLAMP ((gint) r, 0, 255);
d[1] = CLAMP ((gint) g, 0, 255);
d[2] = CLAMP ((gint) b, 0, 255);
r += dr;
g += dg;
b += db;
d += 3;
}
dest += event->area.width * 3;
}
gdk_draw_rgb_image_dithalign (widget->window,
style->fg_gc[widget->state],
event->area.x, event->area.y,
event->area.width, event->area.height,
GDK_RGB_DITHER_MAX,
buf, 3 * event->area.width,
-event->area.x, -event->area.y);
}
static void
add_pigment (ColorselWater *water,
gboolean erase,
gdouble x,
gdouble y,
gdouble much)
{
GimpColorSelector *selector = GIMP_COLOR_SELECTOR (water);
much *= (gdouble) water->pressure_adjust;
if (erase)
{
selector->rgb.r = 1.0 - (1.0 - selector->rgb.r) * (1.0 - much);
selector->rgb.g = 1.0 - (1.0 - selector->rgb.g) * (1.0 - much);
selector->rgb.b = 1.0 - (1.0 - selector->rgb.b) * (1.0 - much);
}
else
{
gdouble r = calc (x, y, 0) / 256.0;
gdouble g = calc (x, y, 120) / 256.0;
gdouble b = calc (x, y, 240) / 256.0;
selector->rgb.r *= (1.0 - (1.0 - r) * much);
selector->rgb.g *= (1.0 - (1.0 - g) * much);
selector->rgb.b *= (1.0 - (1.0 - b) * much);
}
gimp_rgb_clamp (&selector->rgb);
gimp_rgb_to_hsv (&selector->rgb, &selector->hsv);
gimp_color_selector_color_changed (selector);
}
static void
draw_brush (ColorselWater *water,
GtkWidget *widget,
gboolean erase,
gdouble x,
gdouble y,
gdouble pressure)
{
gdouble much = sqrt (SQR (x - water->last_x) + SQR (y - water->last_y));
add_pigment (water, erase, x, y, much * pressure);
water->last_x = x;
water->last_y = y;
}
static gboolean
button_press_event (GtkWidget *widget,
GdkEventButton *event,
ColorselWater *water)
{
gboolean erase;
water->last_x = event->x / widget->allocation.width;
water->last_y = event->y / widget->allocation.height;
erase = (event->button != 1);
/* FIXME: (event->source == GDK_SOURCE_ERASER) */
if (event->state & GDK_SHIFT_MASK)
erase = !erase;
add_pigment (water, erase, water->last_x, water->last_y, 0.05);
water->motion_time = event->time;
return FALSE;
}
static gboolean
motion_notify_event (GtkWidget *widget,
GdkEventMotion *event,
ColorselWater *water)
{
GdkTimeCoord **coords;
gint nevents;
gint i;
gboolean erase;
if (event->state & (GDK_BUTTON1_MASK |
GDK_BUTTON2_MASK |
GDK_BUTTON3_MASK |
GDK_BUTTON4_MASK))
{
guint32 last_motion_time = event->time;
erase = ((event->state &
(GDK_BUTTON2_MASK | GDK_BUTTON3_MASK | GDK_BUTTON4_MASK)) ||
FALSE);
/* FIXME: (event->source == GDK_SOURCE_ERASER) */
if (event->state & GDK_SHIFT_MASK)
erase = !erase;
water->motion_time = event->time;
if (gdk_device_get_history (event->device,
event->window,
last_motion_time,
event->time,
&coords,
&nevents))
{
for (i = 0; i < nevents; i++)
{
gdouble x = 0.0;
gdouble y = 0.0;
gdouble pressure = 0.5;
gdk_device_get_axis (event->device, coords[i]->axes,
GDK_AXIS_X, &x);
gdk_device_get_axis (event->device, coords[i]->axes,
GDK_AXIS_Y, &y);
gdk_device_get_axis (event->device, coords[i]->axes,
GDK_AXIS_PRESSURE, &pressure);
draw_brush (water, widget, erase,
x / widget->allocation.width,
y / widget->allocation.height, pressure);
}
g_free (coords);
}
else
{
gdouble pressure = 0.5;
gdk_event_get_axis ((GdkEvent *) event, GDK_AXIS_PRESSURE, &pressure);
draw_brush (water, widget, erase,
event->x / widget->allocation.width,
event->y / widget->allocation.height, pressure);
}
}
/* Ask for more motion events in case the event was a hint */
gdk_event_request_motions (event);
return TRUE;
}
static gboolean
proximity_out_event (GtkWidget *widget,
GdkEventProximity *event,
ColorselWater *water)
{
return TRUE;
}
static void
pressure_adjust_update (GtkAdjustment *adj,
ColorselWater *water)
{
water->pressure_adjust = (adj->upper - adj->value) / 100.0;
}
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