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gimp/app/widgets/gimphistogrambox.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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.
*/
#include "config.h"
#include <string.h>
#include <gtk/gtk.h>
#include "libgimpwidgets/gimpwidgets.h"
#include "widgets-types.h"
#include "base/gimphistogram.h"
#include "gimpcolorbar.h"
#include "gimphistogrambox.h"
#include "gimphistogramview.h"
#include "gimppropwidgets.h"
#include "gimp-intl.h"
/* #define DEBUG_VIEW */
#define GRADIENT_HEIGHT 12
#define CONTROL_HEIGHT 8
#define HISTOGRAM_EVENT_MASK (GDK_BUTTON_PRESS_MASK | \
GDK_BUTTON_RELEASE_MASK | \
GDK_BUTTON_MOTION_MASK)
/* local function prototypes */
static void gimp_histogram_box_init (GimpHistogramBox *box);
static void gimp_histogram_box_low_adj_update (GtkAdjustment *adj,
GimpHistogramBox *box);
static void gimp_histogram_box_high_adj_update (GtkAdjustment *adj,
GimpHistogramBox *box);
static void gimp_histogram_box_histogram_range (GimpHistogramView *view,
gint start,
gint end,
GimpHistogramBox *box);
static void gimp_histogram_box_channel_notify (GimpHistogramView *view,
GParamSpec *pspec,
GimpColorBar *bar);
static void gimp_histogram_box_border_notify (GimpHistogramView *view,
GParamSpec *pspec,
GimpColorBar *bar);
static gboolean gimp_histogram_slider_area_event (GtkWidget *widget,
GdkEvent *event,
GimpHistogramBox *box);
static gboolean gimp_histogram_slider_area_expose (GtkWidget *widget,
GdkEvent *event,
GimpHistogramBox *box);
static void gimp_histogram_draw_slider (GtkWidget *widget,
GdkGC *border_gc,
GdkGC *fill_gc,
gint xpos);
GType
gimp_histogram_box_get_type (void)
{
static GType box_type = 0;
if (! box_type)
{
static const GTypeInfo box_info =
{
sizeof (GimpHistogramBoxClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) NULL,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpHistogramBox),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_histogram_box_init,
};
box_type = g_type_register_static (GTK_TYPE_VBOX,
"GimpHistogramBox",
&box_info, 0);
}
return box_type;
}
static void
gimp_histogram_box_init (GimpHistogramBox *box)
{
GtkWidget *hbox;
GtkWidget *vbox;
GtkWidget *spinbutton;
GtkObject *adjustment;
GtkWidget *frame;
GtkWidget *view;
GtkWidget *bar;
GtkWidget *slider_area;
gtk_box_set_spacing (GTK_BOX (box), 2);
/* The histogram */
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (box), frame, TRUE, TRUE, 0);
gtk_widget_show (frame);
view = gimp_histogram_view_new (TRUE);
gtk_container_add (GTK_CONTAINER (frame), view);
gtk_widget_show (view);
g_signal_connect (view, "range_changed",
G_CALLBACK (gimp_histogram_box_histogram_range),
box);
box->view = GIMP_HISTOGRAM_VIEW (view);
/* The gradient below the histogram */
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (box), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
box->slider_area = slider_area = gtk_event_box_new ();
gtk_widget_set_size_request (slider_area, -1,
GRADIENT_HEIGHT + CONTROL_HEIGHT);
gtk_widget_add_events (slider_area, HISTOGRAM_EVENT_MASK);
gtk_container_add (GTK_CONTAINER (frame), slider_area);
gtk_widget_show (slider_area);
g_signal_connect (slider_area, "event",
G_CALLBACK (gimp_histogram_slider_area_event),
box);
g_signal_connect_after (slider_area, "expose_event",
G_CALLBACK (gimp_histogram_slider_area_expose),
box);
vbox = gtk_vbox_new (FALSE, 0);
gtk_container_add (GTK_CONTAINER (slider_area), vbox);
gtk_widget_show (vbox);
bar = g_object_new (GIMP_TYPE_COLOR_BAR,
"histogram-channel", box->view->channel,
"xpad", box->view->border_width,
"ypad", box->view->border_width,
NULL);
gtk_widget_set_size_request (bar,
-1,
GRADIENT_HEIGHT + 2 * box->view->border_width);
gtk_box_pack_start (GTK_BOX (vbox), bar, FALSE, FALSE, 0);
gtk_widget_show (bar);
g_signal_connect (view, "notify::histogram-channel",
G_CALLBACK (gimp_histogram_box_channel_notify),
bar);
g_signal_connect (view, "notify::border-width",
G_CALLBACK (gimp_histogram_box_border_notify),
bar);
/* The range selection */
hbox = gtk_hbox_new (FALSE, 6);
gtk_box_pack_start (GTK_BOX (box), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
/* low spinbutton */
spinbutton = gimp_spin_button_new (&adjustment,
0.0, 0.0, 255.0, 1.0, 16.0, 0.0,
1.0, 0);
box->low_adj = GTK_ADJUSTMENT (adjustment);
gtk_box_pack_start (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0);
gtk_widget_show (spinbutton);
g_signal_connect (adjustment, "value_changed",
G_CALLBACK (gimp_histogram_box_low_adj_update),
box);
/* high spinbutton */
spinbutton = gimp_spin_button_new (&adjustment,
255.0, 0.0, 255.0, 1.0, 16.0, 0.0,
1.0, 0);
box->high_adj = GTK_ADJUSTMENT (adjustment);
gtk_box_pack_end (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0);
gtk_widget_show (spinbutton);
g_signal_connect (adjustment, "value_changed",
G_CALLBACK (gimp_histogram_box_high_adj_update),
box);
#ifdef DEBUG_VIEW
spinbutton = gimp_prop_spin_button_new (G_OBJECT (box->view), "border-width",
1, 5, 0);
gtk_box_pack_start (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0);
gtk_widget_show (spinbutton);
spinbutton = gimp_prop_spin_button_new (G_OBJECT (box->view), "subdivisions",
1, 5, 0);
gtk_box_pack_start (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0);
gtk_widget_show (spinbutton);
#endif
}
static void
gimp_histogram_box_low_adj_update (GtkAdjustment *adjustment,
GimpHistogramBox *box)
{
if ((gdouble) box->view->start == adjustment->value)
return;
box->high_adj->lower = adjustment->value;
gtk_adjustment_changed (box->high_adj);
gimp_histogram_view_set_range (box->view,
adjustment->value, box->view->end);
gtk_widget_queue_draw (box->slider_area);
}
static void
gimp_histogram_box_high_adj_update (GtkAdjustment *adjustment,
GimpHistogramBox *box)
{
if ((gdouble) box->view->end == adjustment->value)
return;
box->low_adj->upper = adjustment->value;
gtk_adjustment_changed (box->low_adj);
gimp_histogram_view_set_range (box->view,
box->view->start, adjustment->value);
gtk_widget_queue_draw (box->slider_area);
}
static void
gimp_histogram_box_histogram_range (GimpHistogramView *view,
gint start,
gint end,
GimpHistogramBox *box)
{
box->high_adj->lower = start;
box->low_adj->upper = end;
gtk_adjustment_changed (box->high_adj);
gtk_adjustment_changed (box->low_adj);
gtk_adjustment_set_value (box->low_adj, start);
gtk_adjustment_set_value (box->high_adj, end);
gtk_widget_queue_draw (box->slider_area);
}
static void
gimp_histogram_box_channel_notify (GimpHistogramView *view,
GParamSpec *pspec,
GimpColorBar *bar)
{
gimp_color_bar_set_channel (bar, view->channel);
}
static void
gimp_histogram_box_border_notify (GimpHistogramView *view,
GParamSpec *pspec,
GimpColorBar *bar)
{
g_object_set (bar,
"xpad", view->border_width,
"ypad", view->border_width,
NULL);
gtk_widget_set_size_request (GTK_WIDGET (bar),
-1, GRADIENT_HEIGHT + 2 * view->border_width);
}
GtkWidget *
gimp_histogram_box_new (void)
{
return GTK_WIDGET (g_object_new (GIMP_TYPE_HISTOGRAM_BOX, NULL));
}
void
gimp_histogram_box_set_channel (GimpHistogramBox *box,
GimpHistogramChannel channel)
{
g_return_if_fail (GIMP_IS_HISTOGRAM_BOX (box));
if (box->view)
gimp_histogram_view_set_channel (box->view, channel);
}
static gboolean
gimp_histogram_slider_area_event (GtkWidget *widget,
GdkEvent *event,
GimpHistogramBox *box)
{
GdkEventButton *bevent;
GdkEventMotion *mevent;
gint x, distance;
gint i;
gboolean update = FALSE;
switch (event->type)
{
case GDK_BUTTON_PRESS:
bevent = (GdkEventButton *) event;
distance = G_MAXINT;
for (i = 0; i < 2; i++)
if (fabs (bevent->x - box->slider_pos[i]) < distance)
{
box->active_slider = i;
distance = fabs (bevent->x - box->slider_pos[i]);
}
x = bevent->x;
update = TRUE;
break;
case GDK_BUTTON_RELEASE:
switch (box->active_slider)
{
case 3: /* low output */
gtk_adjustment_set_value (box->low_adj, box->low_slider_val);
break;
case 4: /* high output */
gtk_adjustment_set_value (box->high_adj, box->high_slider_val);
break;
}
break;
case GDK_MOTION_NOTIFY:
mevent = (GdkEventMotion *) event;
gdk_window_get_pointer (widget->window, &x, NULL, NULL);
update = TRUE;
break;
default:
break;
}
if (update)
{
gint width;
gint border;
g_object_get (box->view, "border-width", &border, NULL);
width = widget->allocation.width - 2 * border;
if (width < 1)
return FALSE;
switch (box->active_slider)
{
case 0: /* low output */
box->low_adj->value =
((gdouble) (x - border) / (gdouble) width) * 255.0;
box->low_adj->value =
CLAMP (box->low_adj->value, 0, 255);
gimp_histogram_box_low_adj_update (box->low_adj, box);
break;
case 1: /* high output */
box->high_adj->value =
((gdouble) (x - border) / (gdouble) width) * 255.0;
box->high_adj->value =
CLAMP (box->high_adj->value, 0, 255);
gimp_histogram_box_high_adj_update (box->high_adj, box);
break;
}
}
return FALSE;
}
static gboolean
gimp_histogram_slider_area_expose (GtkWidget *widget,
GdkEvent *event,
GimpHistogramBox *box)
{
gint width = widget->allocation.width;
gint border;
g_object_get (box->view, "border-width", &border, NULL);
width -= 2 * border;
box->slider_pos[0] = ROUND ((gdouble) width *
box->high_adj->lower /
256.0) + border;
box->slider_pos[1] = ROUND ((gdouble) width *
box->low_adj->upper /
256.0) + border;
gimp_histogram_draw_slider (widget,
widget->style->black_gc,
widget->style->black_gc,
box->slider_pos[0]);
gimp_histogram_draw_slider (widget,
widget->style->black_gc,
widget->style->white_gc,
box->slider_pos[1]);
return FALSE;
}
static void
gimp_histogram_draw_slider (GtkWidget *widget,
GdkGC *border_gc,
GdkGC *fill_gc,
gint xpos)
{
gint y;
for (y = 0; y < CONTROL_HEIGHT; y++)
gdk_draw_line (widget->window, fill_gc,
xpos - y / 2, GRADIENT_HEIGHT + y,
xpos + y / 2, GRADIENT_HEIGHT + y);
gdk_draw_line (widget->window, border_gc,
xpos,
GRADIENT_HEIGHT,
xpos - (CONTROL_HEIGHT - 1) / 2,
GRADIENT_HEIGHT + CONTROL_HEIGHT - 1);
gdk_draw_line (widget->window, border_gc,
xpos,
GRADIENT_HEIGHT,
xpos + (CONTROL_HEIGHT - 1) / 2,
GRADIENT_HEIGHT + CONTROL_HEIGHT - 1);
gdk_draw_line (widget->window, border_gc,
xpos - (CONTROL_HEIGHT - 1) / 2,
GRADIENT_HEIGHT + CONTROL_HEIGHT - 1,
xpos + (CONTROL_HEIGHT - 1) / 2,
GRADIENT_HEIGHT + CONTROL_HEIGHT - 1);
}
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