Commit b2ac41b9 authored by Michael Natterer's avatar Michael Natterer 😴

app: add initial version of GimpDial, a widget to select a range of angles

Ported from the color-rotate plug-in.
parent 3e6a7f40
......@@ -133,6 +133,8 @@ libappwidgets_a_sources = \
gimpdevices.h \
gimpdevicestatus.c \
gimpdevicestatus.h \
gimpdial.c \
gimpdial.h \
gimpdialogfactory.c \
gimpdialogfactory.h \
gimpdnd.c \
......
/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpdial.c
* Copyright (C) 2014 Michael Natterer <mitch@gimp.org>
*
* 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 <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "libgimpcolor/gimpcolor.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "widgets-types.h"
#include "gimpdial.h"
#define REL 0.8
#define DEL 0.1
#define TICK 10
#define EACH_OR_BOTH 0.3
enum
{
PROP_0,
PROP_ALPHA,
PROP_BETA
};
enum
{
FOO,
LAST_SIGNAL
};
static void gimp_dial_dispose (GObject *object);
static void gimp_dial_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_dial_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_dial_realize (GtkWidget *widget);
static void gimp_dial_unrealize (GtkWidget *widget);
static void gimp_dial_map (GtkWidget *widget);
static void gimp_dial_unmap (GtkWidget *widget);
static void gimp_dial_size_request (GtkWidget *widget,
GtkRequisition *requisition);
static void gimp_dial_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean gimp_dial_expose_event (GtkWidget *widget,
GdkEventExpose *event);
static gboolean gimp_dial_button_press_event (GtkWidget *widget,
GdkEventButton *bevent);
static gboolean gimp_dial_button_release_event (GtkWidget *widget,
GdkEventButton *bevent);
static gboolean gimp_dial_motion_notify_event (GtkWidget *widget,
GdkEventMotion *mevent);
static void gimp_dial_draw_background (cairo_t *cr,
gint size);
static void gimp_dial_draw_arrows (cairo_t *cr,
gint size,
gdouble alpha,
gdouble beta,
DialDirection direction);
G_DEFINE_TYPE (GimpDial, gimp_dial, GTK_TYPE_WIDGET)
#define parent_class gimp_dial_parent_class
static guint dial_signals[LAST_SIGNAL] = { 0 };
static void
gimp_dial_class_init (GimpDialClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
object_class->dispose = gimp_dial_dispose;
object_class->get_property = gimp_dial_get_property;
object_class->set_property = gimp_dial_set_property;
widget_class->realize = gimp_dial_realize;
widget_class->unrealize = gimp_dial_unrealize;
widget_class->map = gimp_dial_map;
widget_class->unmap = gimp_dial_unmap;
widget_class->size_request = gimp_dial_size_request;
widget_class->size_allocate = gimp_dial_size_allocate;
widget_class->expose_event = gimp_dial_expose_event;
widget_class->button_press_event = gimp_dial_button_press_event;
widget_class->button_release_event = gimp_dial_button_release_event;
widget_class->motion_notify_event = gimp_dial_motion_notify_event;
g_object_class_install_property (object_class, PROP_ALPHA,
g_param_spec_double ("alpha",
NULL, NULL,
0.0, 2 * G_PI, 0.0,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_BETA,
g_param_spec_double ("beta",
NULL, NULL,
0.0, 2 * G_PI, G_PI,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
}
static void
gimp_dial_init (GimpDial *dial)
{
gtk_widget_set_has_window (GTK_WIDGET (dial), FALSE);
gtk_widget_add_events (GTK_WIDGET (dial),
GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK |
GDK_BUTTON1_MOTION_MASK);
dial->border_width = 4;
dial->direction = DIAL_DIRECTION_CW;
}
static void
gimp_dial_dispose (GObject *object)
{
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gimp_dial_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpDial *dial = GIMP_DIAL (object);
switch (property_id)
{
case PROP_ALPHA:
dial->alpha = g_value_get_double (value);
gtk_widget_queue_draw (GTK_WIDGET (dial));
break;
case PROP_BETA:
dial->beta = g_value_get_double (value);
gtk_widget_queue_draw (GTK_WIDGET (dial));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_dial_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpDial *dial = GIMP_DIAL (object);
switch (property_id)
{
case PROP_ALPHA:
g_value_set_double (value, dial->alpha);
break;
case PROP_BETA:
g_value_set_double (value, dial->beta);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_dial_realize (GtkWidget *widget)
{
GimpDial *dial = GIMP_DIAL (widget);
GtkAllocation allocation;
GdkWindowAttr attributes;
gint attributes_mask;
GTK_WIDGET_CLASS (parent_class)->realize (widget);
gtk_widget_get_allocation (widget, &allocation);
attributes.window_type = GDK_WINDOW_CHILD;
attributes.x = allocation.x;
attributes.y = allocation.y;
attributes.width = allocation.width;
attributes.height = allocation.height;
attributes.wclass = GDK_INPUT_ONLY;
attributes.event_mask = gtk_widget_get_events (widget);
attributes_mask = GDK_WA_X | GDK_WA_Y;
dial->event_window = gdk_window_new (gtk_widget_get_window (widget),
&attributes, attributes_mask);
gdk_window_set_user_data (dial->event_window, dial);
}
static void
gimp_dial_unrealize (GtkWidget *widget)
{
GimpDial *dial = GIMP_DIAL (widget);
if (dial->event_window)
{
gdk_window_set_user_data (dial->event_window, NULL);
gdk_window_destroy (dial->event_window);
dial->event_window = NULL;
}
GTK_WIDGET_CLASS (parent_class)->unrealize (widget);
}
static void
gimp_dial_map (GtkWidget *widget)
{
GimpDial *dial = GIMP_DIAL (widget);
GTK_WIDGET_CLASS (parent_class)->map (widget);
if (dial->event_window)
gdk_window_show (dial->event_window);
}
static void
gimp_dial_unmap (GtkWidget *widget)
{
GimpDial *dial = GIMP_DIAL (widget);
if (dial->has_grab)
{
gtk_grab_remove (widget);
dial->has_grab = FALSE;
}
if (dial->event_window)
gdk_window_hide (dial->event_window);
GTK_WIDGET_CLASS (parent_class)->unmap (widget);
}
static void
gimp_dial_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GimpDial *dial = GIMP_DIAL (widget);
requisition->width = 2 * dial->border_width + 128;
requisition->height = 2 * dial->border_width + 128;
}
static void
gimp_dial_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GimpDial *dial = GIMP_DIAL (widget);
gtk_widget_set_allocation (widget, allocation);
if (gtk_widget_get_realized (widget))
gdk_window_move_resize (dial->event_window,
allocation->x,
allocation->y,
allocation->width,
allocation->height);
}
static gboolean
gimp_dial_expose_event (GtkWidget *widget,
GdkEventExpose *event)
{
GimpDial *dial = GIMP_DIAL (widget);
if (gtk_widget_is_drawable (widget))
{
GtkAllocation allocation;
cairo_t *cr;
gint size;
gint x, y;
gtk_widget_get_allocation (widget, &allocation);
cr = gdk_cairo_create (event->window);
gdk_cairo_region (cr, event->region);
cairo_clip (cr);
size = MIN (allocation.width, allocation.height) - 2 * dial->border_width;
x = (allocation.width - 2 * dial->border_width - size) / 2;
y = (allocation.height - 2 * dial->border_width - size) / 2;
cairo_translate (cr,
allocation.x + dial->border_width + x,
allocation.y + dial->border_width + y);
gimp_dial_draw_background (cr, size);
gimp_dial_draw_arrows (cr, size, dial->alpha, dial->beta, dial->direction);
cairo_destroy (cr);
}
return FALSE;
}
static gdouble
angle_mod_2PI (gdouble angle)
{
if (angle < 0)
return angle + 2 * G_PI;
else if (angle > 2 * G_PI)
return angle - 2 * G_PI;
else
return angle;
}
static gdouble
arctg (gdouble y,
gdouble x)
{
gdouble temp = atan2 (y, x);
return (temp < 0) ? (temp + 2 * G_PI) : temp;
}
static gdouble
min_prox (gdouble alpha,
gdouble beta,
gdouble angle)
{
gdouble temp1 = MIN (angle_mod_2PI (alpha - angle),
2 * G_PI - angle_mod_2PI (alpha - angle));
gdouble temp2 = MIN (angle_mod_2PI (beta - angle),
2 * G_PI - angle_mod_2PI (beta - angle));
return MIN (temp1, temp2);
}
static DialTarget
closest (gdouble alpha,
gdouble beta,
gdouble angle)
{
gdouble temp_alpha = MIN (angle_mod_2PI (alpha - angle),
2 * G_PI - angle_mod_2PI (alpha - angle));
gdouble temp_beta = MIN (angle_mod_2PI (beta - angle),
2 * G_PI - angle_mod_2PI (beta - angle));
if (temp_alpha - temp_beta < 0)
return DIAL_TARGET_ALPHA;
else
return DIAL_TARGET_BETA;
}
static gboolean
gimp_dial_button_press_event (GtkWidget *widget,
GdkEventButton *bevent)
{
GimpDial *dial = GIMP_DIAL (widget);
if (bevent->type == GDK_BUTTON_PRESS)
{
if (gdk_event_triggers_context_menu ((GdkEvent *) bevent))
{
dial->press_state = 0;
//g_signal_emit (widget, dial_signals[CONTEXT], 0);
}
else if (bevent->button == 1)
{
GtkAllocation allocation;
gint size;
gdouble center_x;
gdouble center_y;
gdouble press_angle;
gtk_widget_get_allocation (widget, &allocation);
size = MIN (allocation.width, allocation.height) - 2 * dial->border_width;
center_x = allocation.width / 2.0;
center_y = allocation.height / 2.0;
gtk_grab_add (widget);
dial->has_grab = TRUE;
dial->press_state = bevent->state;
press_angle = angle_mod_2PI (arctg (center_y - bevent->y,
bevent->x - center_x));
dial->press_angle = press_angle;
if ((sqrt (SQR (bevent->y - center_y) +
SQR (bevent->x - center_x)) > size / 2.0 * EACH_OR_BOTH) &&
(min_prox (dial->alpha, dial->beta, press_angle) < G_PI / 12))
{
dial->target = closest (dial->alpha, dial->beta, press_angle);
if (dial->target == DIAL_TARGET_ALPHA)
g_object_set (dial, "alpha", press_angle, NULL);
else
g_object_set (dial, "beta", press_angle, NULL);
}
else
{
dial->target = DIAL_TARGET_BOTH;
}
}
}
return FALSE;
}
static gboolean
gimp_dial_button_release_event (GtkWidget *widget,
GdkEventButton *bevent)
{
GimpDial *dial = GIMP_DIAL (widget);
if (bevent->button == 1)
{
gtk_grab_remove (widget);
dial->has_grab = FALSE;
}
return FALSE;
}
static gboolean
gimp_dial_motion_notify_event (GtkWidget *widget,
GdkEventMotion *mevent)
{
GimpDial *dial = GIMP_DIAL (widget);
GtkAllocation allocation;
gdouble center_x;
gdouble center_y;
gfloat motion_angle, delta;
gtk_widget_get_allocation (widget, &allocation);
center_x = allocation.width / 2.0;
center_y = allocation.height / 2.0;
motion_angle = angle_mod_2PI (arctg (center_y - mevent->y,
mevent->x - center_x));
delta = motion_angle - dial->press_angle;
dial->press_angle = motion_angle;
if (delta)
{
if (dial->target == DIAL_TARGET_ALPHA)
{
g_object_set (dial, "alpha", motion_angle, NULL);
}
else if (dial->target == DIAL_TARGET_BETA)
{
g_object_set (dial, "beta", motion_angle, NULL);
}
else
{
g_object_set (dial,
"alpha", angle_mod_2PI (dial->alpha + delta),
"beta", angle_mod_2PI (dial->beta + delta),
NULL);
}
}
return FALSE;
}
/* public functions */
GtkWidget *
gimp_dial_new (void)
{
return g_object_new (GIMP_TYPE_DIAL, NULL);
}
/* private functions */
static void
gimp_dial_draw_background (cairo_t *cr,
gint size)
{
cairo_surface_t *surface;
guchar *data;
gint stride;
gint i, j;
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, size, size);
data = cairo_image_surface_get_data (surface);
stride = cairo_image_surface_get_stride (surface);
for (j = 0; j < size; j++)
{
for (i = 0; i < size; i++)
{
gdouble h, s, v;
guchar rgb[3];
s = sqrt ((SQR (i - size / 2.0) +
SQR (j - size / 2.0)) / (gdouble) SQR (size / 2.0));
h = arctg (size / 2.0 - j, i - size / 2.0) / (2 * G_PI);
v = 1 - sqrt (s) / 4;
gimp_hsv_to_rgb4 (rgb, h, MIN (1.0, s), v);
GIMP_CAIRO_ARGB32_SET_PIXEL (data + j * stride + i * 4,
rgb[0], rgb[1], rgb[2], 255);
}
}
cairo_surface_mark_dirty (surface);
cairo_save (cr);
cairo_set_source_surface (cr, surface, 0.0, 0.0);
cairo_arc (cr, size / 2.0, size / 2.0, size / 2.0, 0.0, 2 * G_PI);
cairo_clip (cr);
cairo_paint (cr);
cairo_restore (cr);
cairo_surface_destroy (surface);
}
static void
gimp_dial_draw_arrows (cairo_t *cr,
gint size,
gdouble alpha,
gdouble beta,
DialDirection direction)
{
gint radius = size / 2.0;
gint dist;
gdouble delta;
delta = angle_mod_2PI (beta - alpha);
if (direction == DIAL_DIRECTION_CCW)
delta = delta - 2 * G_PI;
cairo_move_to (cr, radius, radius);
cairo_line_to (cr,
ROUND (radius + radius * cos (alpha)),
ROUND (radius - radius * sin (alpha)));
cairo_move_to (cr,
radius + radius * cos (alpha),
radius - radius * sin (alpha));
cairo_line_to (cr,
ROUND (radius + radius * REL * cos (alpha - DEL)),
ROUND (radius - radius * REL * sin (alpha - DEL)));
cairo_move_to (cr,
radius + radius * cos (alpha),
radius - radius * sin (alpha));
cairo_line_to (cr,
ROUND (radius + radius * REL * cos (alpha + DEL)),
ROUND (radius - radius * REL * sin (alpha + DEL)));
cairo_move_to (cr,
radius,
radius);
cairo_line_to (cr,
ROUND (radius + radius * cos (beta)),
ROUND (radius - radius * sin (beta)));
cairo_move_to (cr,
radius + radius * cos (beta),
radius - radius * sin (beta));
cairo_line_to (cr,
ROUND (radius + radius * REL * cos (beta - DEL)),
ROUND (radius - radius * REL * sin (beta - DEL)));
cairo_move_to (cr,
radius + radius * cos (beta),
radius - radius * sin (beta));
cairo_line_to (cr,
ROUND (radius + radius * REL * cos (beta + DEL)),
ROUND (radius - radius * REL * sin (beta + DEL)));
dist = radius * EACH_OR_BOTH;
cairo_move_to (cr,
radius + dist * cos (beta),
radius - dist * sin (beta));
cairo_line_to (cr,
ROUND (radius + dist * cos(beta) +
direction * TICK * sin (beta)),
ROUND (radius - dist * sin(beta) +
direction * TICK * cos (beta)));
cairo_new_sub_path (cr);
if (direction == DIAL_DIRECTION_CW)
{
cairo_arc_negative (cr,