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gimp/app/widgets/gimpnavigationview.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* GimpNavigationView Widget
* Copyright (C) 2001-2002 Michael Natterer <mitch@gimp.org>
*
* partly based on app/nav_window
* Copyright (C) 1999 Andy Thomas <alt@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 <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <math.h>
#include <gegl.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include "libgimpmath/gimpmath.h"
#include "widgets-types.h"
#include "core/gimpimage.h"
#include "core/gimpmarshal.h"
#include "gimpnavigationview.h"
#include "gimpviewrenderer.h"
#include "gimpwidgets-utils.h"
#define BORDER_WIDTH 2
enum
{
MARKER_CHANGED,
ZOOM,
SCROLL,
LAST_SIGNAL
};
struct _GimpNavigationView
{
GimpView parent_instance;
/* values in image coordinates */
gdouble center_x;
gdouble center_y;
gdouble width;
gdouble height;
gboolean flip_horizontally;
gboolean flip_vertically;
gdouble rotate_angle;
/* values in view coordinates */
gint p_center_x;
gint p_center_y;
gint p_width;
gint p_height;
gint motion_offset_x;
gint motion_offset_y;
gboolean has_grab;
};
static void gimp_navigation_view_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean gimp_navigation_view_draw (GtkWidget *widget,
cairo_t *cr);
static gboolean gimp_navigation_view_button_press (GtkWidget *widget,
GdkEventButton *bevent);
static gboolean gimp_navigation_view_button_release (GtkWidget *widget,
GdkEventButton *bevent);
static gboolean gimp_navigation_view_scroll (GtkWidget *widget,
GdkEventScroll *sevent);
static gboolean gimp_navigation_view_motion_notify (GtkWidget *widget,
GdkEventMotion *mevent);
static gboolean gimp_navigation_view_key_press (GtkWidget *widget,
GdkEventKey *kevent);
static void gimp_navigation_view_transform (GimpNavigationView *nav_view);
static void gimp_navigation_view_draw_marker (GimpNavigationView *nav_view,
cairo_t *cr);
static void gimp_navigation_view_move_to (GimpNavigationView *nav_view,
gint tx,
gint ty);
static void gimp_navigation_view_get_ratio (GimpNavigationView *nav_view,
gdouble *ratiox,
gdouble *ratioy);
static gboolean gimp_navigation_view_point_in_marker (GimpNavigationView *nav_view,
gint x,
gint y);
G_DEFINE_TYPE (GimpNavigationView, gimp_navigation_view, GIMP_TYPE_VIEW)
#define parent_class gimp_navigation_view_parent_class
static guint view_signals[LAST_SIGNAL] = { 0 };
static void
gimp_navigation_view_class_init (GimpNavigationViewClass *klass)
{
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
view_signals[MARKER_CHANGED] =
g_signal_new ("marker-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpNavigationViewClass, marker_changed),
NULL, NULL,
gimp_marshal_VOID__DOUBLE_DOUBLE_DOUBLE_DOUBLE,
G_TYPE_NONE, 4,
G_TYPE_DOUBLE,
G_TYPE_DOUBLE,
G_TYPE_DOUBLE,
G_TYPE_DOUBLE);
view_signals[ZOOM] =
g_signal_new ("zoom",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpNavigationViewClass, zoom),
NULL, NULL,
gimp_marshal_VOID__ENUM_DOUBLE,
G_TYPE_NONE, 2,
GIMP_TYPE_ZOOM_TYPE,
G_TYPE_DOUBLE);
view_signals[SCROLL] =
g_signal_new ("scroll",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpNavigationViewClass, scroll),
NULL, NULL,
gimp_marshal_VOID__BOXED,
G_TYPE_NONE, 1,
GDK_TYPE_EVENT);
widget_class->size_allocate = gimp_navigation_view_size_allocate;
widget_class->draw = gimp_navigation_view_draw;
widget_class->button_press_event = gimp_navigation_view_button_press;
widget_class->button_release_event = gimp_navigation_view_button_release;
widget_class->scroll_event = gimp_navigation_view_scroll;
widget_class->motion_notify_event = gimp_navigation_view_motion_notify;
widget_class->key_press_event = gimp_navigation_view_key_press;
}
static void
gimp_navigation_view_init (GimpNavigationView *view)
{
gtk_widget_set_can_focus (GTK_WIDGET (view), TRUE);
gtk_widget_add_events (GTK_WIDGET (view),
GDK_SCROLL_MASK |
GDK_SMOOTH_SCROLL_MASK |
GDK_POINTER_MOTION_MASK |
GDK_KEY_PRESS_MASK);
view->center_x = 0.0;
view->center_y = 0.0;
view->width = 0.0;
view->height = 0.0;
view->flip_horizontally = FALSE;
view->flip_vertically = FALSE;
view->rotate_angle = 0.0;
view->p_center_x = 0;
view->p_center_y = 0;
view->p_width = 0;
view->p_height = 0;
view->motion_offset_x = 0;
view->motion_offset_y = 0;
view->has_grab = FALSE;
}
static void
gimp_navigation_view_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GTK_WIDGET_CLASS (parent_class)->size_allocate (widget, allocation);
if (GIMP_VIEW (widget)->renderer->viewable)
gimp_navigation_view_transform (GIMP_NAVIGATION_VIEW (widget));
}
static gboolean
gimp_navigation_view_draw (GtkWidget *widget,
cairo_t *cr)
{
GTK_WIDGET_CLASS (parent_class)->draw (widget, cr);
gimp_navigation_view_draw_marker (GIMP_NAVIGATION_VIEW (widget), cr);
return TRUE;
}
void
gimp_navigation_view_grab_pointer (GimpNavigationView *nav_view,
GdkEvent *event)
{
GtkWidget *widget = GTK_WIDGET (nav_view);
GdkDisplay *display;
GdkCursor *cursor;
GdkWindow *window;
nav_view->has_grab = TRUE;
gtk_grab_add (widget);
display = gtk_widget_get_display (widget);
cursor = gdk_cursor_new_for_display (display, GDK_FLEUR);
window = GIMP_VIEW (nav_view)->event_window;
gdk_seat_grab (gdk_event_get_seat (event),
window,
GDK_SEAT_CAPABILITY_ALL,
FALSE, cursor, event, NULL, NULL);
g_object_unref (cursor);
}
static gboolean
gimp_navigation_view_button_press (GtkWidget *widget,
GdkEventButton *bevent)
{
GimpNavigationView *nav_view = GIMP_NAVIGATION_VIEW (widget);
gint tx, ty;
GdkDisplay *display;
tx = bevent->x;
ty = bevent->y;
if (bevent->type == GDK_BUTTON_PRESS && bevent->button == 1)
{
if (! gimp_navigation_view_point_in_marker (nav_view, tx, ty))
{
GdkCursor *cursor;
nav_view->motion_offset_x = 0;
nav_view->motion_offset_y = 0;
gimp_navigation_view_move_to (nav_view, tx, ty);
display = gtk_widget_get_display (widget);
cursor = gdk_cursor_new_for_display (display, GDK_FLEUR);
gdk_window_set_cursor (GIMP_VIEW (widget)->event_window, cursor);
g_object_unref (cursor);
}
else
{
nav_view->motion_offset_x = tx - nav_view->p_center_x;
nav_view->motion_offset_y = ty - nav_view->p_center_y;
}
gimp_navigation_view_grab_pointer (nav_view, (GdkEvent *) bevent);
}
return TRUE;
}
static gboolean
gimp_navigation_view_button_release (GtkWidget *widget,
GdkEventButton *bevent)
{
GimpNavigationView *nav_view = GIMP_NAVIGATION_VIEW (widget);
if (bevent->button == 1 && nav_view->has_grab)
{
nav_view->has_grab = FALSE;
gtk_grab_remove (widget);
gdk_seat_ungrab (gdk_event_get_seat ((GdkEvent *) bevent));
}
return TRUE;
}
static gboolean
gimp_navigation_view_scroll (GtkWidget *widget,
GdkEventScroll *sevent)
{
if (sevent->state & gimp_get_toggle_behavior_mask ())
{
gdouble delta;
switch (sevent->direction)
{
case GDK_SCROLL_UP:
g_signal_emit (widget, view_signals[ZOOM], 0, GIMP_ZOOM_IN, 0.0);
break;
case GDK_SCROLL_DOWN:
g_signal_emit (widget, view_signals[ZOOM], 0, GIMP_ZOOM_OUT, 0.0);
break;
case GDK_SCROLL_SMOOTH:
gdk_event_get_scroll_deltas ((GdkEvent *) sevent, NULL, &delta);
g_signal_emit (widget, view_signals[ZOOM], 0, GIMP_ZOOM_SMOOTH, delta);
break;
default:
break;
}
}
else
{
g_signal_emit (widget, view_signals[SCROLL], 0, sevent);
}
return TRUE;
}
static gboolean
gimp_navigation_view_motion_notify (GtkWidget *widget,
GdkEventMotion *mevent)
{
GimpNavigationView *nav_view = GIMP_NAVIGATION_VIEW (widget);
GimpView *view = GIMP_VIEW (widget);
if (! nav_view->has_grab)
{
GdkDisplay *display = gtk_widget_get_display (widget);
GdkCursor *cursor;
if (nav_view->p_center_x == view->renderer->width / 2 &&
nav_view->p_center_y == view->renderer->height / 2 &&
nav_view->p_width == view->renderer->width &&
nav_view->p_height == view->renderer->height)
{
gdk_window_set_cursor (view->event_window, NULL);
return FALSE;
}
else if (gimp_navigation_view_point_in_marker (nav_view,
mevent->x, mevent->y))
{
cursor = gdk_cursor_new_for_display (display, GDK_FLEUR);
}
else
{
cursor = gdk_cursor_new_for_display (display, GDK_HAND2);
}
gdk_window_set_cursor (view->event_window, cursor);
g_object_unref (cursor);
return FALSE;
}
gimp_navigation_view_move_to (nav_view,
mevent->x - nav_view->motion_offset_x,
mevent->y - nav_view->motion_offset_y);
gdk_event_request_motions (mevent);
return TRUE;
}
static gboolean
gimp_navigation_view_key_press (GtkWidget *widget,
GdkEventKey *kevent)
{
GimpNavigationView *nav_view = GIMP_NAVIGATION_VIEW (widget);
gint scroll_x = 0;
gint scroll_y = 0;
switch (kevent->keyval)
{
case GDK_KEY_Up:
scroll_y = -1;
break;
case GDK_KEY_Left:
scroll_x = -1;
break;
case GDK_KEY_Right:
scroll_x = 1;
break;
case GDK_KEY_Down:
scroll_y = 1;
break;
default:
break;
}
if (scroll_x || scroll_y)
{
gimp_navigation_view_move_to (nav_view,
nav_view->p_center_x + scroll_x,
nav_view->p_center_y + scroll_y);
return TRUE;
}
return FALSE;
}
/* public functions */
void
gimp_navigation_view_set_marker (GimpNavigationView *nav_view,
gdouble center_x,
gdouble center_y,
gdouble width,
gdouble height,
gboolean flip_horizontally,
gboolean flip_vertically,
gdouble rotate_angle)
{
GimpView *view;
g_return_if_fail (GIMP_IS_NAVIGATION_VIEW (nav_view));
view = GIMP_VIEW (nav_view);
g_return_if_fail (view->renderer->viewable);
nav_view->center_x = center_x;
nav_view->center_y = center_y;
nav_view->width = MAX (1.0, width);
nav_view->height = MAX (1.0, height);
nav_view->flip_horizontally = flip_horizontally ? TRUE : FALSE;
nav_view->flip_vertically = flip_vertically ? TRUE : FALSE;
nav_view->rotate_angle = rotate_angle;
gimp_navigation_view_transform (nav_view);
/* Marker changed, redraw */
gtk_widget_queue_draw (GTK_WIDGET (view));
}
void
gimp_navigation_view_set_motion_offset (GimpNavigationView *view,
gint motion_offset_x,
gint motion_offset_y)
{
g_return_if_fail (GIMP_IS_NAVIGATION_VIEW (view));
view->motion_offset_x = motion_offset_x;
view->motion_offset_y = motion_offset_y;
}
void
gimp_navigation_view_get_local_marker (GimpNavigationView *view,
gint *center_x,
gint *center_y,
gint *width,
gint *height)
{
g_return_if_fail (GIMP_IS_NAVIGATION_VIEW (view));
if (center_x) *center_x = view->p_center_x;
if (center_y) *center_y = view->p_center_y;
if (width) *width = view->p_width;
if (height) *height = view->p_height;
}
/* private functions */
static void
gimp_navigation_view_transform (GimpNavigationView *nav_view)
{
gdouble ratiox, ratioy;
gimp_navigation_view_get_ratio (nav_view, &ratiox, &ratioy);
nav_view->p_center_x = RINT (nav_view->center_x * ratiox);
nav_view->p_center_y = RINT (nav_view->center_y * ratioy);
nav_view->p_width = ceil (nav_view->width * ratiox);
nav_view->p_height = ceil (nav_view->height * ratioy);
}
static void
gimp_navigation_view_draw_marker (GimpNavigationView *nav_view,
cairo_t *cr)
{
GimpView *view = GIMP_VIEW (nav_view);
if (view->renderer->viewable && nav_view->width && nav_view->height)
{
GtkWidget *widget = GTK_WIDGET (view);
GtkAllocation allocation;
gint p_width_2;
gint p_height_2;
gdouble angle;
p_width_2 = nav_view->p_width / 2;
p_height_2 = nav_view->p_height / 2;
angle = G_PI * nav_view->rotate_angle / 180.0;
if (nav_view->flip_horizontally != nav_view->flip_vertically)
angle = -angle;
gtk_widget_get_allocation (widget, &allocation);
cairo_rectangle (cr,
0, 0,
allocation.width, allocation.height);
cairo_translate (cr, nav_view->p_center_x, nav_view->p_center_y);
cairo_rotate (cr, -angle);
cairo_rectangle (cr,
-p_width_2, -p_height_2,
nav_view->p_width, nav_view->p_height);
cairo_set_source_rgba (cr, 0, 0, 0, 0.5);
cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
cairo_fill (cr);
cairo_rectangle (cr,
-p_width_2, -p_height_2,
nav_view->p_width, nav_view->p_height);
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_set_line_width (cr, BORDER_WIDTH);
cairo_stroke (cr);
}
}
static void
gimp_navigation_view_move_to (GimpNavigationView *nav_view,
gint tx,
gint ty)
{
GimpView *view = GIMP_VIEW (nav_view);
gdouble ratiox, ratioy;
gdouble x, y;
if (! view->renderer->viewable)
return;
gimp_navigation_view_get_ratio (nav_view, &ratiox, &ratioy);
x = tx / ratiox;
y = ty / ratioy;
g_signal_emit (view, view_signals[MARKER_CHANGED], 0,
x, y, nav_view->width, nav_view->height);
}
static void
gimp_navigation_view_get_ratio (GimpNavigationView *nav_view,
gdouble *ratiox,
gdouble *ratioy)
{
GimpView *view = GIMP_VIEW (nav_view);
GimpImage *image;
image = GIMP_IMAGE (view->renderer->viewable);
*ratiox = (gdouble) view->renderer->width /
(gdouble) gimp_image_get_width (image);
*ratioy = (gdouble) view->renderer->height /
(gdouble) gimp_image_get_height (image);
}
static gboolean
gimp_navigation_view_point_in_marker (GimpNavigationView *nav_view,
gint x,
gint y)
{
gint p_width_2, p_height_2;
gdouble angle;
gdouble tx, ty;
p_width_2 = nav_view->p_width / 2;
p_height_2 = nav_view->p_height / 2;
angle = G_PI * nav_view->rotate_angle / 180.0;
if (nav_view->flip_horizontally != nav_view->flip_vertically)
angle = -angle;
x -= nav_view->p_center_x;
y -= nav_view->p_center_y;
tx = cos (angle) * x - sin (angle) * y;
ty = sin (angle) * x + cos (angle) * y;
return tx >= -p_width_2 && tx < p_width_2 &&
ty >= -p_height_2 && ty < p_height_2;
}
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