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gimp/app/widgets/gimpdial.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpdial.c
* Copyright (C) 2014 Michael Natterer <mitch@gimp.org>
*
* Based on code from the color-rotate plug-in
* Copyright (C) 1997-1999 Sven Anders (anderss@fmi.uni-passau.de)
* Based on code from Pavel Grinfeld (pavel@ml.com)
*
* 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 <gegl.h>
#include <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "libgimpcolor/gimpcolor.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "widgets-types.h"
#include "core/gimp-cairo.h"
#include "gimpdial.h"
#define SEGMENT_FRACTION 0.3
enum
{
PROP_0,
PROP_DRAW_BETA,
PROP_ALPHA,
PROP_BETA,
PROP_CLOCKWISE
};
typedef enum
{
DIAL_TARGET_NONE = 0,
DIAL_TARGET_ALPHA = 1 << 0,
DIAL_TARGET_BETA = 1 << 1,
DIAL_TARGET_BOTH = DIAL_TARGET_ALPHA | DIAL_TARGET_BETA
} DialTarget;
struct _GimpDialPrivate
{
gdouble alpha;
gdouble beta;
gboolean clockwise;
gboolean draw_beta;
DialTarget target;
gdouble last_angle;
};
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 gboolean gimp_dial_expose_event (GtkWidget *widget,
GdkEventExpose *event);
static gboolean gimp_dial_button_press_event (GtkWidget *widget,
GdkEventButton *bevent);
static gboolean gimp_dial_motion_notify_event (GtkWidget *widget,
GdkEventMotion *mevent);
static void gimp_dial_reset_target (GimpCircle *circle);
static void gimp_dial_set_target (GimpDial *dial,
DialTarget target);
static void gimp_dial_draw_arrows (cairo_t *cr,
gint size,
gdouble alpha,
gdouble beta,
gboolean clockwise,
DialTarget highlight,
gboolean draw_beta);
static gdouble gimp_dial_normalize_angle (gdouble angle);
static gdouble gimp_dial_get_angle_distance (gdouble alpha,
gdouble beta);
G_DEFINE_TYPE (GimpDial, gimp_dial, GIMP_TYPE_CIRCLE)
#define parent_class gimp_dial_parent_class
static void
gimp_dial_class_init (GimpDialClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
GimpCircleClass *circle_class = GIMP_CIRCLE_CLASS (klass);
object_class->get_property = gimp_dial_get_property;
object_class->set_property = gimp_dial_set_property;
widget_class->expose_event = gimp_dial_expose_event;
widget_class->button_press_event = gimp_dial_button_press_event;
widget_class->motion_notify_event = gimp_dial_motion_notify_event;
circle_class->reset_target = gimp_dial_reset_target;
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));
g_object_class_install_property (object_class, PROP_CLOCKWISE,
g_param_spec_boolean ("clockwise",
NULL, NULL,
FALSE,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_DRAW_BETA,
g_param_spec_boolean ("draw-beta",
NULL, NULL,
TRUE,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_type_class_add_private (klass, sizeof (GimpDialPrivate));
}
static void
gimp_dial_init (GimpDial *dial)
{
dial->priv = G_TYPE_INSTANCE_GET_PRIVATE (dial,
GIMP_TYPE_DIAL,
GimpDialPrivate);
}
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->priv->alpha = g_value_get_double (value);
gtk_widget_queue_draw (GTK_WIDGET (dial));
break;
case PROP_BETA:
dial->priv->beta = g_value_get_double (value);
gtk_widget_queue_draw (GTK_WIDGET (dial));
break;
case PROP_CLOCKWISE:
dial->priv->clockwise = g_value_get_boolean (value);
gtk_widget_queue_draw (GTK_WIDGET (dial));
break;
case PROP_DRAW_BETA:
dial->priv->draw_beta = g_value_get_boolean (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->priv->alpha);
break;
case PROP_BETA:
g_value_set_double (value, dial->priv->beta);
break;
case PROP_CLOCKWISE:
g_value_set_boolean (value, dial->priv->clockwise);
break;
case PROP_DRAW_BETA:
g_value_set_boolean (value, dial->priv->draw_beta);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gboolean
gimp_dial_expose_event (GtkWidget *widget,
GdkEventExpose *event)
{
GimpDial *dial = GIMP_DIAL (widget);
GTK_WIDGET_CLASS (parent_class)->expose_event (widget, event);
if (gtk_widget_is_drawable (widget))
{
GtkAllocation allocation;
gint size;
cairo_t *cr;
g_object_get (widget,
"size", &size,
NULL);
cr = gdk_cairo_create (event->window);
gdk_cairo_region (cr, event->region);
cairo_clip (cr);
gtk_widget_get_allocation (widget, &allocation);
cairo_translate (cr,
(gdouble) allocation.x + (allocation.width - size) / 2.0,
(gdouble) allocation.y + (allocation.height - size) / 2.0);
gimp_dial_draw_arrows (cr, size,
dial->priv->alpha, dial->priv->beta,
dial->priv->clockwise,
dial->priv->target,
dial->priv->draw_beta);
cairo_destroy (cr);
}
return FALSE;
}
static gboolean
gimp_dial_button_press_event (GtkWidget *widget,
GdkEventButton *bevent)
{
GimpDial *dial = GIMP_DIAL (widget);
if (bevent->type == GDK_BUTTON_PRESS &&
bevent->button == 1 &&
dial->priv->target != DIAL_TARGET_NONE)
{
gdouble angle;
GTK_WIDGET_CLASS (parent_class)->button_press_event (widget, bevent);
angle = _gimp_circle_get_angle_and_distance (GIMP_CIRCLE (dial),
bevent->x, bevent->y,
NULL);
dial->priv->last_angle = angle;
switch (dial->priv->target)
{
case DIAL_TARGET_ALPHA:
g_object_set (dial, "alpha", angle, NULL);
break;
case DIAL_TARGET_BETA:
g_object_set (dial, "beta", angle, NULL);
break;
default:
break;
}
}
return FALSE;
}
static gboolean
gimp_dial_motion_notify_event (GtkWidget *widget,
GdkEventMotion *mevent)
{
GimpDial *dial = GIMP_DIAL (widget);
gdouble angle;
gdouble distance;
angle = _gimp_circle_get_angle_and_distance (GIMP_CIRCLE (dial),
mevent->x, mevent->y,
&distance);
if (_gimp_circle_has_grab (GIMP_CIRCLE (dial)))
{
gdouble delta;
delta = angle - dial->priv->last_angle;
dial->priv->last_angle = angle;
if (delta != 0.0)
{
switch (dial->priv->target)
{
case DIAL_TARGET_ALPHA:
g_object_set (dial, "alpha", angle, NULL);
break;
case DIAL_TARGET_BETA:
g_object_set (dial, "beta", angle, NULL);
break;
case DIAL_TARGET_BOTH:
g_object_set (dial,
"alpha", gimp_dial_normalize_angle (dial->priv->alpha + delta),
"beta", gimp_dial_normalize_angle (dial->priv->beta + delta),
NULL);
break;
default:
break;
}
}
}
else
{
DialTarget target;
gdouble dist_alpha;
gdouble dist_beta;
dist_alpha = gimp_dial_get_angle_distance (dial->priv->alpha, angle);
dist_beta = gimp_dial_get_angle_distance (dial->priv->beta, angle);
if (dial->priv->draw_beta &&
distance > SEGMENT_FRACTION &&
MIN (dist_alpha, dist_beta) < G_PI / 12)
{
if (dist_alpha < dist_beta)
{
target = DIAL_TARGET_ALPHA;
}
else
{
target = DIAL_TARGET_BETA;
}
}
else
{
target = DIAL_TARGET_BOTH;
}
gimp_dial_set_target (dial, target);
}
gdk_event_request_motions (mevent);
return FALSE;
}
static void
gimp_dial_reset_target (GimpCircle *circle)
{
gimp_dial_set_target (GIMP_DIAL (circle), DIAL_TARGET_NONE);
}
/* public functions */
GtkWidget *
gimp_dial_new (void)
{
return g_object_new (GIMP_TYPE_DIAL, NULL);
}
/* private functions */
static void
gimp_dial_set_target (GimpDial *dial,
DialTarget target)
{
if (target != dial->priv->target)
{
dial->priv->target = target;
gtk_widget_queue_draw (GTK_WIDGET (dial));
}
}
static void
gimp_dial_draw_arrow (cairo_t *cr,
gdouble radius,
gdouble angle)
{
#define REL 0.8
#define DEL 0.1
cairo_move_to (cr, radius, radius);
cairo_line_to (cr,
radius + radius * cos (angle),
radius - radius * sin (angle));
cairo_move_to (cr,
radius + radius * cos (angle),
radius - radius * sin (angle));
cairo_line_to (cr,
radius + radius * REL * cos (angle - DEL),
radius - radius * REL * sin (angle - DEL));
cairo_move_to (cr,
radius + radius * cos (angle),
radius - radius * sin (angle));
cairo_line_to (cr,
radius + radius * REL * cos (angle + DEL),
radius - radius * REL * sin (angle + DEL));
}
static void
gimp_dial_draw_segment (cairo_t *cr,
gdouble radius,
gdouble alpha,
gdouble beta,
gboolean clockwise)
{
gint direction = clockwise ? -1 : 1;
gint segment_dist;
gint tick;
gdouble slice;
segment_dist = radius * SEGMENT_FRACTION;
tick = MIN (10, segment_dist);
cairo_move_to (cr,
radius + segment_dist * cos (beta),
radius - segment_dist * sin (beta));
cairo_line_to (cr,
radius + segment_dist * cos (beta) +
direction * tick * sin (beta),
radius - segment_dist * sin (beta) +
direction * tick * cos (beta));
cairo_new_sub_path (cr);
if (clockwise)
slice = -gimp_dial_normalize_angle (alpha - beta);
else
slice = gimp_dial_normalize_angle (beta - alpha);
gimp_cairo_add_arc (cr, radius, radius, segment_dist,
alpha, slice);
}
static void
gimp_dial_draw_arrows (cairo_t *cr,
gint size,
gdouble alpha,
gdouble beta,
gboolean clockwise,
DialTarget highlight,
gboolean draw_beta)
{
gdouble radius = size / 2.0 - 2.0; /* half the broad line with and half a px */
cairo_save (cr);
cairo_translate (cr, 2.0, 2.0); /* half the broad line width and half a px*/
cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
if (highlight != DIAL_TARGET_BOTH)
{
if (! (highlight & DIAL_TARGET_ALPHA))
gimp_dial_draw_arrow (cr, radius, alpha);
if (draw_beta)
{
if (! (highlight & DIAL_TARGET_BETA))
gimp_dial_draw_arrow (cr, radius, beta);
if ((highlight & DIAL_TARGET_BOTH) != DIAL_TARGET_BOTH)
gimp_dial_draw_segment (cr, radius, alpha, beta, clockwise);
}
cairo_set_line_width (cr, 3.0);
cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.6);
cairo_stroke_preserve (cr);
cairo_set_line_width (cr, 1.0);
cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.8);
cairo_stroke (cr);
}
if (highlight != DIAL_TARGET_NONE)
{
if (highlight & DIAL_TARGET_ALPHA)
gimp_dial_draw_arrow (cr, radius, alpha);
if (draw_beta)
{
if (highlight & DIAL_TARGET_BETA)
gimp_dial_draw_arrow (cr, radius, beta);
if ((highlight & DIAL_TARGET_BOTH) == DIAL_TARGET_BOTH)
gimp_dial_draw_segment (cr, radius, alpha, beta, clockwise);
}
cairo_set_line_width (cr, 3.0);
cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.6);
cairo_stroke_preserve (cr);
cairo_set_line_width (cr, 1.0);
cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.8);
cairo_stroke (cr);
}
cairo_restore (cr);
}
static gdouble
gimp_dial_normalize_angle (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
gimp_dial_get_angle_distance (gdouble alpha,
gdouble beta)
{
return ABS (MIN (gimp_dial_normalize_angle (alpha - beta),
2 * G_PI - gimp_dial_normalize_angle (alpha - beta)));
}
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