/* Watercolor color_select_module, Raph Levien , February 1998 * * Ported to loadable color-selector, Sven Neumann , 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 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 . */ #include "config.h" #include #include #include #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 gboolean 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 , Sven Neumann ", "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; GtkAdjustment *adj; GtkWidget *scale; water->pressure_adjust = 1.0; hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 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 (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_scale_new (GTK_ORIENTATION_VERTICAL, 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 gboolean select_area_expose (GtkWidget *widget, GdkEventExpose *event) { cairo_t *cr; GtkAllocation allocation; gdouble dx; gdouble dy; cairo_surface_t *surface; guchar *dest; gdouble y; gint j; cr = gdk_cairo_create (event->window); gdk_cairo_region (cr, event->region); cairo_clip (cr); gtk_widget_get_allocation (widget, &allocation); dx = 1.0 / allocation.width; dy = 1.0 / allocation.height; surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, event->area.width, event->area.height); dest = cairo_image_surface_get_data (surface); for (j = 0, y = event->area.y / allocation.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; gint i; r += event->area.x * dr; g += event->area.x * dg; b += event->area.x * db; for (i = 0; i < event->area.width; i++) { GIMP_CAIRO_RGB24_SET_PIXEL (d, CLAMP ((gint) r, 0, 255), CLAMP ((gint) g, 0, 255), CLAMP ((gint) b, 0, 255)); r += dr; g += dg; b += db; d += 4; } dest += cairo_image_surface_get_stride (surface); } cairo_surface_mark_dirty (surface); cairo_set_source_surface (cr, surface, event->area.x, event->area.y); cairo_surface_destroy (surface); cairo_paint (cr); cairo_destroy (cr); return FALSE; } 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) { GtkAllocation allocation; gboolean erase; gtk_widget_get_allocation (widget, &allocation); water->last_x = event->x / allocation.width; water->last_y = event->y / 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) { GtkAllocation allocation; GdkTimeCoord **coords; gint nevents; gint i; gboolean erase; gtk_widget_get_allocation (widget, &allocation); 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 / allocation.width, y / 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 / allocation.width, event->y / 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 = (gtk_adjustment_get_upper (adj) - gtk_adjustment_get_value (adj)) / 100.0; }