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PIKApp/app/widgets/pikacurveview.c

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Initial checkin of Pika from heckimp
2023-09-26 00:35:21 +02:00
/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* 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 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 <string.h>
#include <gegl.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include "libpikabase/pikabase.h"
#include "libpikamath/pikamath.h"
#include "libpikacolor/pikacolor.h"
#include "libpikaconfig/pikaconfig.h"
#include "libpikawidgets/pikawidgets.h"
#include "widgets-types.h"
#include "core/pika.h"
#include "core/pikacurve.h"
#include "core/pikacurve-map.h"
#include "pikaclipboard.h"
#include "pikacurveview.h"
#include "pikawidgets-utils.h"
#define POINT_MAX_DISTANCE 16.0
enum
{
PROP_0,
PROP_PIKA,
PROP_BASE_LINE,
PROP_GRID_ROWS,
PROP_GRID_COLUMNS,
PROP_X_AXIS_LABEL,
PROP_Y_AXIS_LABEL
};
enum
{
SELECTION_CHANGED,
CUT_CLIPBOARD,
COPY_CLIPBOARD,
PASTE_CLIPBOARD,
LAST_SIGNAL
};
typedef struct
{
PikaCurve *curve;
PikaRGB color;
gboolean color_set;
} BGCurve;
static void pika_curve_view_finalize (GObject *object);
static void pika_curve_view_dispose (GObject *object);
static void pika_curve_view_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void pika_curve_view_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void pika_curve_view_style_updated (GtkWidget *widget);
static gboolean pika_curve_view_draw (GtkWidget *widget,
cairo_t *cr);
static gboolean pika_curve_view_button_press (GtkWidget *widget,
GdkEventButton *bevent);
static gboolean pika_curve_view_button_release (GtkWidget *widget,
GdkEventButton *bevent);
static gboolean pika_curve_view_motion_notify (GtkWidget *widget,
GdkEventMotion *bevent);
static gboolean pika_curve_view_leave_notify (GtkWidget *widget,
GdkEventCrossing *cevent);
static gboolean pika_curve_view_key_press (GtkWidget *widget,
GdkEventKey *kevent);
static void pika_curve_view_cut_clipboard (PikaCurveView *view);
static void pika_curve_view_copy_clipboard (PikaCurveView *view);
static void pika_curve_view_paste_clipboard (PikaCurveView *view);
static void pika_curve_view_curve_dirty (PikaCurve *curve,
PikaCurveView *view);
static void pika_curve_view_curve_notify_n_points (PikaCurve *curve,
GParamSpec *pspec,
PikaCurveView *view);
static void pika_curve_view_set_cursor (PikaCurveView *view,
gdouble x,
gdouble y);
static void pika_curve_view_unset_cursor (PikaCurveView *view);
G_DEFINE_TYPE (PikaCurveView, pika_curve_view,
PIKA_TYPE_HISTOGRAM_VIEW)
#define parent_class pika_curve_view_parent_class
static guint curve_view_signals[LAST_SIGNAL] = { 0 };
static void
pika_curve_view_class_init (PikaCurveViewClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
GtkBindingSet *binding_set;
object_class->finalize = pika_curve_view_finalize;
object_class->dispose = pika_curve_view_dispose;
object_class->set_property = pika_curve_view_set_property;
object_class->get_property = pika_curve_view_get_property;
widget_class->style_updated = pika_curve_view_style_updated;
widget_class->draw = pika_curve_view_draw;
widget_class->button_press_event = pika_curve_view_button_press;
widget_class->button_release_event = pika_curve_view_button_release;
widget_class->motion_notify_event = pika_curve_view_motion_notify;
widget_class->leave_notify_event = pika_curve_view_leave_notify;
widget_class->key_press_event = pika_curve_view_key_press;
klass->selection_changed = NULL;
klass->cut_clipboard = pika_curve_view_cut_clipboard;
klass->copy_clipboard = pika_curve_view_copy_clipboard;
klass->paste_clipboard = pika_curve_view_paste_clipboard;
g_object_class_install_property (object_class, PROP_PIKA,
g_param_spec_object ("pika",
NULL, NULL,
PIKA_TYPE_PIKA,
PIKA_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_BASE_LINE,
g_param_spec_boolean ("base-line",
NULL, NULL,
TRUE,
PIKA_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));
g_object_class_install_property (object_class, PROP_GRID_ROWS,
g_param_spec_int ("grid-rows", NULL, NULL,
0, 100, 8,
PIKA_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));
g_object_class_install_property (object_class, PROP_GRID_COLUMNS,
g_param_spec_int ("grid-columns", NULL, NULL,
0, 100, 8,
PIKA_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));
g_object_class_install_property (object_class, PROP_X_AXIS_LABEL,
g_param_spec_string ("x-axis-label", NULL, NULL,
NULL,
PIKA_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_Y_AXIS_LABEL,
g_param_spec_string ("y-axis-label", NULL, NULL,
NULL,
PIKA_PARAM_READWRITE));
curve_view_signals[SELECTION_CHANGED] =
g_signal_new ("selection-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (PikaCurveViewClass, selection_changed),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
curve_view_signals[CUT_CLIPBOARD] =
g_signal_new ("cut-clipboard",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (PikaCurveViewClass, cut_clipboard),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
curve_view_signals[COPY_CLIPBOARD] =
g_signal_new ("copy-clipboard",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (PikaCurveViewClass, copy_clipboard),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
curve_view_signals[PASTE_CLIPBOARD] =
g_signal_new ("paste-clipboard",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (PikaCurveViewClass, paste_clipboard),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
binding_set = gtk_binding_set_by_class (klass);
gtk_binding_entry_add_signal (binding_set, GDK_KEY_x, GDK_CONTROL_MASK,
"cut-clipboard", 0);
gtk_binding_entry_add_signal (binding_set, GDK_KEY_c, GDK_CONTROL_MASK,
"copy-clipboard", 0);
gtk_binding_entry_add_signal (binding_set, GDK_KEY_v, GDK_CONTROL_MASK,
"paste-clipboard", 0);
}
static void
pika_curve_view_init (PikaCurveView *view)
{
view->curve = NULL;
view->selected = -1;
view->offset_x = 0.0;
view->offset_y = 0.0;
view->last_x = 0.0;
view->last_y = 0.0;
view->cursor_type = -1;
view->xpos = -1.0;
view->cursor_x = -1.0;
view->cursor_y = -1.0;
view->range_x_min = 0.0;
view->range_x_max = 1.0;
view->range_y_min = 0.0;
view->range_y_max = 1.0;
view->x_axis_label = NULL;
view->y_axis_label = NULL;
gtk_widget_set_can_focus (GTK_WIDGET (view), TRUE);
gtk_widget_add_events (GTK_WIDGET (view),
GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK |
GDK_BUTTON1_MOTION_MASK |
GDK_POINTER_MOTION_MASK |
GDK_KEY_PRESS_MASK |
GDK_LEAVE_NOTIFY_MASK);
}
static void
pika_curve_view_finalize (GObject *object)
{
PikaCurveView *view = PIKA_CURVE_VIEW (object);
g_clear_object (&view->orig_curve);
g_clear_object (&view->layout);
g_clear_object (&view->cursor_layout);
g_clear_pointer (&view->x_axis_label, g_free);
g_clear_pointer (&view->y_axis_label, g_free);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
pika_curve_view_dispose (GObject *object)
{
PikaCurveView *view = PIKA_CURVE_VIEW (object);
pika_curve_view_set_curve (view, NULL, NULL);
if (view->bg_curves)
pika_curve_view_remove_all_backgrounds (view);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
pika_curve_view_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
PikaCurveView *view = PIKA_CURVE_VIEW (object);
switch (property_id)
{
case PROP_PIKA:
view->pika = g_value_get_object (value); /* don't ref */
break;
case PROP_GRID_ROWS:
view->grid_rows = g_value_get_int (value);
break;
case PROP_GRID_COLUMNS:
view->grid_columns = g_value_get_int (value);
break;
case PROP_BASE_LINE:
view->draw_base_line = g_value_get_boolean (value);
break;
case PROP_X_AXIS_LABEL:
pika_curve_view_set_x_axis_label (view, g_value_get_string (value));
break;
case PROP_Y_AXIS_LABEL:
pika_curve_view_set_y_axis_label (view, g_value_get_string (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_curve_view_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaCurveView *view = PIKA_CURVE_VIEW (object);
switch (property_id)
{
case PROP_PIKA:
g_value_set_object (value, view->pika);
break;
case PROP_GRID_ROWS:
g_value_set_int (value, view->grid_rows);
break;
case PROP_GRID_COLUMNS:
g_value_set_int (value, view->grid_columns);
break;
case PROP_BASE_LINE:
g_value_set_boolean (value, view->draw_base_line);
break;
case PROP_X_AXIS_LABEL:
g_value_set_string (value, view->x_axis_label);
break;
case PROP_Y_AXIS_LABEL:
g_value_set_string (value, view->y_axis_label);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_curve_view_style_updated (GtkWidget *widget)
{
PikaCurveView *view = PIKA_CURVE_VIEW (widget);
GTK_WIDGET_CLASS (parent_class)->style_updated (widget);
g_clear_object (&view->layout);
g_clear_object (&view->cursor_layout);
}
static void
pika_curve_view_draw_grid (PikaCurveView *view,
cairo_t *cr,
gint width,
gint height,
gint border)
{
gint i;
for (i = 1; i < view->grid_rows; i++)
{
gint y = i * (height - 1) / view->grid_rows;
if ((view->grid_rows % 2) == 0 && (i == view->grid_rows / 2))
continue;
cairo_move_to (cr, border, border + y);
cairo_line_to (cr, border + width - 1, border + y);
}
for (i = 1; i < view->grid_columns; i++)
{
gint x = i * (width - 1) / view->grid_columns;
if ((view->grid_columns % 2) == 0 && (i == view->grid_columns / 2))
continue;
cairo_move_to (cr, border + x, border);
cairo_line_to (cr, border + x, border + height - 1);
}
if (view->draw_base_line)
{
cairo_move_to (cr, border, border + height - 1);
cairo_line_to (cr, border + width - 1, border);
}
cairo_set_line_width (cr, 0.6);
cairo_stroke (cr);
if ((view->grid_rows % 2) == 0)
{
gint y = (height - 1) / 2;
cairo_move_to (cr, border, border + y);
cairo_line_to (cr, border + width - 1, border + y);
}
if ((view->grid_columns % 2) == 0)
{
gint x = (width - 1) / 2;
cairo_move_to (cr, border + x, border);
cairo_line_to (cr, border + x, border + height - 1);
}
cairo_set_line_width (cr, 1.0);
cairo_stroke (cr);
}
static void
pika_curve_view_draw_point (PikaCurveView *view,
cairo_t *cr,
gint i,
gint width,
gint height,
gint border)
{
gdouble x, y;
pika_curve_get_point (view->curve, i, &x, &y);
y = 1.0 - y;
#define CIRCLE_RADIUS 3
#define DIAMOND_RADIUS (G_SQRT2 * CIRCLE_RADIUS)
switch (pika_curve_get_point_type (view->curve, i))
{
case PIKA_CURVE_POINT_SMOOTH:
cairo_move_to (cr,
border + (gdouble) (width - 1) * x + CIRCLE_RADIUS,
border + (gdouble) (height - 1) * y);
cairo_arc (cr,
border + (gdouble) (width - 1) * x,
border + (gdouble) (height - 1) * y,
CIRCLE_RADIUS,
0, 2 * G_PI);
break;
case PIKA_CURVE_POINT_CORNER:
cairo_move_to (cr,
border + (gdouble) (width - 1) * x,
border + (gdouble) (height - 1) * y - DIAMOND_RADIUS);
cairo_line_to (cr,
border + (gdouble) (width - 1) * x + DIAMOND_RADIUS,
border + (gdouble) (height - 1) * y);
cairo_line_to (cr,
border + (gdouble) (width - 1) * x,
border + (gdouble) (height - 1) * y + DIAMOND_RADIUS);
cairo_line_to (cr,
border + (gdouble) (width - 1) * x - DIAMOND_RADIUS,
border + (gdouble) (height - 1) * y);
cairo_close_path (cr);
break;
}
}
static void
pika_curve_view_draw_curve (PikaCurveView *view,
cairo_t *cr,
PikaCurve *curve,
gint width,
gint height,
gint border)
{
gdouble x, y;
gint i;
x = 0.0;
y = 1.0 - pika_curve_map_value (curve, 0.0);
cairo_move_to (cr,
border + (gdouble) (width - 1) * x,
border + (gdouble) (height - 1)* y);
for (i = 1; i < 256; i++)
{
x = (gdouble) i / 255.0;
y = 1.0 - pika_curve_map_value (curve, x);
cairo_line_to (cr,
border + (gdouble) (width - 1) * x,
border + (gdouble) (height - 1) * y);
}
cairo_stroke (cr);
}
static gboolean
pika_curve_view_draw (GtkWidget *widget,
cairo_t *cr)
{
PikaCurveView *view = PIKA_CURVE_VIEW (widget);
GtkStyleContext *style = gtk_widget_get_style_context (widget);
GtkAllocation allocation;
GdkRGBA grid_color;
GdkRGBA fg_color;
GdkRGBA bg_color;
GList *list;
gint border;
gint width;
gint height;
gint layout_x;
gint layout_y;
gdouble x, y;
gint i;
cairo_save (cr);
GTK_WIDGET_CLASS (parent_class)->draw (widget, cr);
cairo_restore (cr);
if (! view->curve)
return FALSE;
gtk_style_context_save (style);
gtk_style_context_add_class (style, "view");
gtk_widget_get_allocation (widget, &allocation);
border = PIKA_HISTOGRAM_VIEW (view)->border_width;
width = allocation.width - 2 * border;
height = allocation.height - 2 * border;
if (gtk_widget_has_focus (widget))
{
gtk_render_focus (style, cr,
border - 2, border - 2,
width + 4, height + 4);
}
cairo_set_line_width (cr, 1.0);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
cairo_translate (cr, 0.5, 0.5);
gtk_style_context_get_color (style, gtk_style_context_get_state (style),
&fg_color);
bg_color = fg_color;
bg_color.red = 1 - bg_color.red;
bg_color.green = 1 - bg_color.green;
bg_color.blue = 1 - bg_color.blue;
gtk_style_context_add_class (style, "grid");
gtk_style_context_get_color (style, gtk_style_context_get_state (style),
&grid_color);
gtk_style_context_remove_class (style, "grid");
/* Draw the grid lines */
gdk_cairo_set_source_rgba (cr, &grid_color);
pika_curve_view_draw_grid (view, cr, width, height, border);
/* Draw the axis labels */
if (view->x_axis_label)
{
if (! view->layout)
view->layout = gtk_widget_create_pango_layout (widget, NULL);
pango_layout_set_text (view->layout, view->x_axis_label, -1);
pango_layout_get_pixel_size (view->layout, &layout_x, &layout_y);
cairo_move_to (cr,
width - border - layout_x,
height - border - layout_y);
pango_cairo_show_layout (cr, view->layout);
}
if (view->y_axis_label)
{
if (! view->layout)
view->layout = gtk_widget_create_pango_layout (widget, NULL);
pango_layout_set_text (view->layout, view->y_axis_label, -1);
pango_layout_get_pixel_size (view->layout, &layout_x, &layout_y);
cairo_save (cr);
cairo_move_to (cr,
2 * border,
2 * border + layout_x);
cairo_rotate (cr, - G_PI / 2);
pango_cairo_show_layout (cr, view->layout);
cairo_restore (cr);
}
/* Draw the background curves */
for (list = view->bg_curves; list; list = g_list_next (list))
{
BGCurve *bg = list->data;
if (bg->color_set)
{
cairo_set_source_rgba (cr,
bg->color.r,
bg->color.g,
bg->color.b,
0.5);
}
else
{
cairo_set_source_rgba (cr,
fg_color.red,
fg_color.green,
fg_color.blue,
0.5);
}
pika_curve_view_draw_curve (view, cr, bg->curve,
width, height, border);
}
/* Draw the curve */
if (view->curve_color)
pika_cairo_set_source_rgb (cr, view->curve_color);
else
gdk_cairo_set_source_rgba (cr, &fg_color);
pika_curve_view_draw_curve (view, cr, view->curve,
width, height, border);
/* Draw the points */
if (pika_curve_get_curve_type (view->curve) == PIKA_CURVE_SMOOTH)
{
/* Draw the unselected points */
for (i = 0; i < view->curve->n_points; i++)
{
if (i == view->selected)
continue;
pika_curve_view_draw_point (view, cr, i, width, height, border);
}
cairo_stroke (cr);
/* Draw the selected point */
if (view->selected != -1)
{
pika_curve_view_draw_point (view, cr, view->selected,
width, height, border);
cairo_fill (cr);
}
}
if (view->xpos >= 0.0)
{
gchar buf[32];
/* draw the color line */
cairo_move_to (cr,
border + ROUND ((gdouble) (width - 1) * view->xpos),
border + 1);
cairo_line_to (cr,
border + ROUND ((gdouble) (width - 1) * view->xpos),
border + height - 1);
cairo_stroke (cr);
if (view->range_x_max == 255.0)
{
/* stupid heuristic: special-case for 0..255 */
g_snprintf (buf, sizeof (buf), "x:%3d",
(gint) (view->xpos *
(view->range_x_max - view->range_x_min) +
view->range_x_min));
}
else if (view->range_x_max == 100.0)
{
/* and for 0..100 */
g_snprintf (buf, sizeof (buf), "x:%0.2f",
view->xpos *
(view->range_x_max - view->range_x_min) +
view->range_x_min);
}
else
{
g_snprintf (buf, sizeof (buf), "x:%0.3f",
view->xpos *
(view->range_x_max - view->range_x_min) +
view->range_x_min);
}
if (! view->layout)
view->layout = gtk_widget_create_pango_layout (widget, NULL);
pango_layout_set_text (view->layout, buf, -1);
pango_layout_get_pixel_size (view->layout, &layout_x, &layout_y);
if (view->xpos < 0.5)
layout_x = border;
else
layout_x = -(layout_x + border);
cairo_move_to (cr,
border + (gdouble) width * view->xpos + layout_x,
border + height - border - layout_y);
pango_cairo_show_layout (cr, view->layout);
}
if (view->cursor_x >= 0.0 && view->cursor_x <= 1.0 &&
view->cursor_y >= 0.0 && view->cursor_y <= 1.0)
{
gchar buf[32];
gint w, h;
if (! view->cursor_layout)
view->cursor_layout = gtk_widget_create_pango_layout (widget, NULL);
if (view->range_x_max == 255.0 &&
view->range_y_max == 255.0)
{
/* stupid heuristic: special-case for 0..255 */
g_snprintf (buf, sizeof (buf), "x:%3d y:%3d",
(gint) round (view->cursor_x *
(view->range_x_max - view->range_x_min) +
view->range_x_min),
(gint) round ((1.0 - view->cursor_y) *
(view->range_y_max - view->range_y_min) +
view->range_y_min));
}
else if (view->range_x_max == 100.0 &&
view->range_y_max == 100.0)
{
/* and for 0..100 */
g_snprintf (buf, sizeof (buf), "x:%0.2f y:%0.2f",
view->cursor_x *
(view->range_x_max - view->range_x_min) +
view->range_x_min,
(1.0 - view->cursor_y) *
(view->range_y_max - view->range_y_min) +
view->range_y_min);
}
else
{
g_snprintf (buf, sizeof (buf), "x:%0.3f y:%0.3f",
view->cursor_x *
(view->range_x_max - view->range_x_min) +
view->range_x_min,
(1.0 - view->cursor_y) *
(view->range_y_max - view->range_y_min) +
view->range_y_min);
}
pango_layout_set_text (view->cursor_layout, buf, -1);
pango_layout_get_pixel_extents (view->cursor_layout,
NULL, &view->cursor_rect);
x = border * 2 + 3;
y = border * 2 + 3;
w = view->cursor_rect.width;
h = view->cursor_rect.height;
if (view->x_axis_label)
x += border + view->cursor_rect.height; /* coincidentially the right value */
cairo_push_group (cr);
cairo_rectangle (cr, x + 0.5, y + 0.5, w, h);
cairo_fill_preserve (cr);
cairo_set_line_width (cr, 6);
cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
cairo_stroke (cr);
gdk_cairo_set_source_rgba (cr, &bg_color);
cairo_move_to (cr, x, y);
pango_cairo_show_layout (cr, view->cursor_layout);
cairo_pop_group_to_source (cr);
cairo_paint_with_alpha (cr, 0.6);
}
gtk_style_context_restore (style);
return FALSE;
}
static void
set_cursor (PikaCurveView *view,
GdkCursorType new_cursor)
{
if (new_cursor != view->cursor_type)
{
GdkDisplay *display = gtk_widget_get_display (GTK_WIDGET (view));
GdkCursor *cursor = gdk_cursor_new_for_display (display, new_cursor);
gdk_window_set_cursor (gtk_widget_get_window (GTK_WIDGET (view)), cursor);
g_object_unref (cursor);
view->cursor_type = new_cursor;
}
}
static gboolean
pika_curve_view_button_press (GtkWidget *widget,
GdkEventButton *bevent)
{
PikaCurveView *view = PIKA_CURVE_VIEW (widget);
PikaCurve *curve = view->curve;
GtkAllocation allocation;
gint border;
gint width, height;
gdouble x;
gdouble y;
gint point;
gdouble point_x;
gdouble point_y;
if (! curve || bevent->button != 1)
return TRUE;
gtk_widget_get_allocation (widget, &allocation);
border = PIKA_HISTOGRAM_VIEW (view)->border_width;
width = allocation.width - 2 * border;
height = allocation.height - 2 * border;
x = (gdouble) (bevent->x - border) / (gdouble) width;
y = (gdouble) (bevent->y - border) / (gdouble) height;
x = CLAMP (x, 0.0, 1.0);
y = CLAMP (y, 0.0, 1.0);
view->grabbed = TRUE;
view->orig_curve = PIKA_CURVE (pika_data_duplicate (PIKA_DATA (curve)));
set_cursor (view, GDK_TCROSS);
switch (pika_curve_get_curve_type (curve))
{
case PIKA_CURVE_SMOOTH:
point = pika_curve_get_closest_point (curve, x, 1.0 - y,
POINT_MAX_DISTANCE /
MAX (width, height));
if (point < 0)
{
PikaCurvePointType type = PIKA_CURVE_POINT_SMOOTH;
if (bevent->state & pika_get_constrain_behavior_mask ())
y = 1.0 - pika_curve_map_value (view->orig_curve, x);
if (view->selected >= 0)
type = pika_curve_get_point_type (curve, view->selected);
point = pika_curve_add_point (curve, x, 1.0 - y);
pika_curve_set_point_type (curve, point, type);
}
if (point > 0)
pika_curve_get_point (curve, point - 1, &view->leftmost, NULL);
else
view->leftmost = -1.0;
if (point < pika_curve_get_n_points (curve) - 1)
pika_curve_get_point (curve, point + 1, &view->rightmost, NULL);
else
view->rightmost = 2.0;
pika_curve_view_set_selected (view, point);
pika_curve_get_point (curve, point, &point_x, &point_y);
view->offset_x = point_x - x;
view->offset_y = (1.0 - point_y) - y;
view->point_type = pika_curve_get_point_type (curve, point);
break;
case PIKA_CURVE_FREE:
view->last_x = x;
view->last_y = y;
pika_curve_set_curve (curve, x, 1.0 - y);
break;
}
if (! gtk_widget_has_focus (widget))
gtk_widget_grab_focus (widget);
return TRUE;
}
static gboolean
pika_curve_view_button_release (GtkWidget *widget,
GdkEventButton *bevent)
{
PikaCurveView *view = PIKA_CURVE_VIEW (widget);
if (bevent->button != 1)
return TRUE;
g_clear_object (&view->orig_curve);
view->offset_x = 0.0;
view->offset_y = 0.0;
view->grabbed = FALSE;
set_cursor (view, GDK_FLEUR);
return TRUE;
}
static gboolean
pika_curve_view_motion_notify (GtkWidget *widget,
GdkEventMotion *mevent)
{
PikaCurveView *view = PIKA_CURVE_VIEW (widget);
PikaCurve *curve = view->curve;
GtkAllocation allocation;
GdkCursorType new_cursor = GDK_X_CURSOR;
gint border;
gint width, height;
gdouble x;
gdouble y;
gdouble point_x;
gdouble point_y;
gint point;
if (! curve)
return TRUE;
gtk_widget_get_allocation (widget, &allocation);
border = PIKA_HISTOGRAM_VIEW (view)->border_width;
width = allocation.width - 2 * border;
height = allocation.height - 2 * border;
x = (gdouble) (mevent->x - border) / (gdouble) width;
y = (gdouble) (mevent->y - border) / (gdouble) height;
x += view->offset_x;
y += view->offset_y;
x = CLAMP (x, 0.0, 1.0);
y = CLAMP (y, 0.0, 1.0);
switch (pika_curve_get_curve_type (curve))
{
case PIKA_CURVE_SMOOTH:
if (! view->grabbed) /* If no point is grabbed... */
{
point = pika_curve_get_closest_point (curve, x, 1.0 - y,
POINT_MAX_DISTANCE /
MAX (width, height));
if (point >= 0)
{
pika_curve_get_point (curve, point, &point_x, &point_y);
new_cursor = GDK_FLEUR;
x = point_x;
y = 1.0 - point_y;
}
else
{
new_cursor = GDK_TCROSS;
if (mevent->state & pika_get_constrain_behavior_mask ())
y = 1.0 - pika_curve_map_value (view->curve, x);
}
}
else /* Else, drag the grabbed point */
{
new_cursor = GDK_TCROSS;
if (mevent->state & pika_get_constrain_behavior_mask ())
y = 1.0 - pika_curve_map_value (view->orig_curve, x);
pika_data_freeze (PIKA_DATA (curve));
if (x > view->leftmost && x < view->rightmost)
{
if (view->selected < 0)
{
pika_curve_view_set_selected (
view,
pika_curve_add_point (curve, x, 1.0 - y));
pika_curve_set_point_type (curve,
view->selected, view->point_type);
}
else
{
pika_curve_set_point (curve, view->selected, x, 1.0 - y);
}
}
else
{
if (view->selected >= 0)
{
pika_curve_delete_point (curve, view->selected);
pika_curve_view_set_selected (view, -1);
}
}
pika_data_thaw (PIKA_DATA (curve));
}
break;
case PIKA_CURVE_FREE:
if (view->grabbed)
{
gint n_samples = pika_curve_get_n_samples (curve);
gdouble x1, x2;
gdouble y1, y2;
if (view->last_x > x)
{
x1 = x;
x2 = view->last_x;
y1 = y;
y2 = view->last_y;
}
else
{
x1 = view->last_x;
x2 = x;
y1 = view->last_y;
y2 = y;
}
if (x2 != x1)
{
gint from = ROUND (x1 * (gdouble) (n_samples - 1));
gint to = ROUND (x2 * (gdouble) (n_samples - 1));
gint i;
pika_data_freeze (PIKA_DATA (curve));
for (i = from; i <= to; i++)
{
gdouble xpos = (gdouble) i / (gdouble) (n_samples - 1);
gdouble ypos = (y1 + ((y2 - y1) * (xpos - x1)) / (x2 - x1));
xpos = CLAMP (xpos, 0.0, 1.0);
ypos = CLAMP (ypos, 0.0, 1.0);
pika_curve_set_curve (curve, xpos, 1.0 - ypos);
}
pika_data_thaw (PIKA_DATA (curve));
}
else
{
pika_curve_set_curve (curve, x, 1.0 - y);
}
view->last_x = x;
view->last_y = y;
}
if (mevent->state & GDK_BUTTON1_MASK)
new_cursor = GDK_TCROSS;
else
new_cursor = GDK_PENCIL;
break;
}
set_cursor (view, new_cursor);
pika_curve_view_set_cursor (view, x, y);
return TRUE;
}
static gboolean
pika_curve_view_leave_notify (GtkWidget *widget,
GdkEventCrossing *cevent)
{
PikaCurveView *view = PIKA_CURVE_VIEW (widget);
pika_curve_view_unset_cursor (view);
return TRUE;
}
static gboolean
pika_curve_view_key_press (GtkWidget *widget,
GdkEventKey *kevent)
{
PikaCurveView *view = PIKA_CURVE_VIEW (widget);
PikaCurve *curve = view->curve;
gboolean handled = FALSE;
if (! view->grabbed &&
curve &&
pika_curve_get_curve_type (curve) == PIKA_CURVE_SMOOTH &&
view->selected >= 0)
{
gint i = view->selected;
gdouble x, y;
pika_curve_get_point (curve, i, NULL, &y);
switch (kevent->keyval)
{
case GDK_KEY_Left:
for (i = i - 1; i >= 0 && ! handled; i--)
{
pika_curve_get_point (curve, i, &x, NULL);
if (x >= 0.0)
{
pika_curve_view_set_selected (view, i);
handled = TRUE;
}
}
break;
case GDK_KEY_Right:
for (i = i + 1; i < curve->n_points && ! handled; i++)
{
pika_curve_get_point (curve, i, &x, NULL);
if (x >= 0.0)
{
pika_curve_view_set_selected (view, i);
handled = TRUE;
}
}
break;
case GDK_KEY_Up:
if (y < 1.0)
{
y = y + (kevent->state & GDK_SHIFT_MASK ?
(16.0 / 255.0) : (1.0 / 255.0));
pika_curve_move_point (curve, i, CLAMP (y, 0.0, 1.0));
handled = TRUE;
}
break;
case GDK_KEY_Down:
if (y > 0)
{
y = y - (kevent->state & GDK_SHIFT_MASK ?
(16.0 / 255.0) : (1.0 / 255.0));
pika_curve_move_point (curve, i, CLAMP (y, 0.0, 1.0));
handled = TRUE;
}
break;
case GDK_KEY_Delete:
pika_curve_delete_point (curve, i);
break;
default:
break;
}
}
if (handled)
{
set_cursor (view, GDK_TCROSS);
return TRUE;
}
return GTK_WIDGET_CLASS (parent_class)->key_press_event (widget, kevent);
}
static void
pika_curve_view_cut_clipboard (PikaCurveView *view)
{
g_printerr ("%s\n", G_STRFUNC);
if (! view->curve || ! view->pika)
{
gtk_widget_error_bell (GTK_WIDGET (view));
return;
}
pika_curve_view_copy_clipboard (view);
pika_curve_reset (view->curve, FALSE);
}
static void
pika_curve_view_copy_clipboard (PikaCurveView *view)
{
PikaCurve *copy;
g_printerr ("%s\n", G_STRFUNC);
if (! view->curve || ! view->pika)
{
gtk_widget_error_bell (GTK_WIDGET (view));
return;
}
copy = PIKA_CURVE (pika_data_duplicate (PIKA_DATA (view->curve)));
pika_clipboard_set_curve (view->pika, copy);
g_object_unref (copy);
}
static void
pika_curve_view_paste_clipboard (PikaCurveView *view)
{
PikaCurve *copy;
g_printerr ("%s\n", G_STRFUNC);
if (! view->curve || ! view->pika)
{
gtk_widget_error_bell (GTK_WIDGET (view));
return;
}
copy = pika_clipboard_get_curve (view->pika);
if (copy)
{
pika_config_copy (PIKA_CONFIG (copy),
PIKA_CONFIG (view->curve), 0);
g_object_unref (copy);
}
}
static void
pika_curve_view_curve_dirty (PikaCurve *curve,
PikaCurveView *view)
{
gtk_widget_queue_draw (GTK_WIDGET (view));
}
static void
pika_curve_view_curve_notify_n_points (PikaCurve *curve,
GParamSpec *pspec,
PikaCurveView *view)
{
pika_curve_view_set_selected (view, -1);
}
/* public functions */
GtkWidget *
pika_curve_view_new (void)
{
return g_object_new (PIKA_TYPE_CURVE_VIEW, NULL);
}
void
pika_curve_view_set_curve (PikaCurveView *view,
PikaCurve *curve,
const PikaRGB *color)
{
g_return_if_fail (PIKA_IS_CURVE_VIEW (view));
g_return_if_fail (curve == NULL || PIKA_IS_CURVE (curve));
if (view->curve == curve)
return;
if (view->curve)
{
g_signal_handlers_disconnect_by_func (view->curve,
pika_curve_view_curve_dirty,
view);
g_signal_handlers_disconnect_by_func (view->curve,
pika_curve_view_curve_notify_n_points,
view);
g_object_unref (view->curve);
}
view->curve = curve;
if (view->curve)
{
g_object_ref (view->curve);
g_signal_connect (view->curve, "dirty",
G_CALLBACK (pika_curve_view_curve_dirty),
view);
g_signal_connect (view->curve, "notify::n-points",
G_CALLBACK (pika_curve_view_curve_notify_n_points),
view);
}
if (view->curve_color)
g_free (view->curve_color);
if (color)
view->curve_color = g_memdup2 (color, sizeof (PikaRGB));
else
view->curve_color = NULL;
pika_curve_view_set_selected (view, -1);
gtk_widget_queue_draw (GTK_WIDGET (view));
}
PikaCurve *
pika_curve_view_get_curve (PikaCurveView *view)
{
g_return_val_if_fail (PIKA_IS_CURVE_VIEW (view), NULL);
return view->curve;
}
void
pika_curve_view_add_background (PikaCurveView *view,
PikaCurve *curve,
const PikaRGB *color)
{
GList *list;
BGCurve *bg;
g_return_if_fail (PIKA_IS_CURVE_VIEW (view));
g_return_if_fail (PIKA_IS_CURVE (curve));
for (list = view->bg_curves; list; list = g_list_next (list))
{
bg = list->data;
g_return_if_fail (curve != bg->curve);
}
bg = g_slice_new0 (BGCurve);
bg->curve = g_object_ref (curve);
if (color)
{
bg->color = *color;
bg->color_set = TRUE;
}
g_signal_connect (bg->curve, "dirty",
G_CALLBACK (pika_curve_view_curve_dirty),
view);
view->bg_curves = g_list_append (view->bg_curves, bg);
gtk_widget_queue_draw (GTK_WIDGET (view));
}
void
pika_curve_view_remove_background (PikaCurveView *view,
PikaCurve *curve)
{
GList *list;
g_return_if_fail (PIKA_IS_CURVE_VIEW (view));
g_return_if_fail (PIKA_IS_CURVE (curve));
for (list = view->bg_curves; list; list = g_list_next (list))
{
BGCurve *bg = list->data;
if (bg->curve == curve)
{
g_signal_handlers_disconnect_by_func (bg->curve,
pika_curve_view_curve_dirty,
view);
g_object_unref (bg->curve);
view->bg_curves = g_list_remove (view->bg_curves, bg);
g_slice_free (BGCurve, bg);
gtk_widget_queue_draw (GTK_WIDGET (view));
break;
}
}
if (! list)
g_return_if_reached ();
}
void
pika_curve_view_remove_all_backgrounds (PikaCurveView *view)
{
g_return_if_fail (PIKA_IS_CURVE_VIEW (view));
while (view->bg_curves)
{
BGCurve *bg = view->bg_curves->data;
g_signal_handlers_disconnect_by_func (bg->curve,
pika_curve_view_curve_dirty,
view);
g_object_unref (bg->curve);
view->bg_curves = g_list_remove (view->bg_curves, bg);
g_slice_free (BGCurve, bg);
}
gtk_widget_queue_draw (GTK_WIDGET (view));
}
void
pika_curve_view_set_selected (PikaCurveView *view,
gint selected)
{
g_return_if_fail (PIKA_IS_CURVE_VIEW (view));
if (selected != view->selected)
{
view->selected = selected;
g_signal_emit (view, curve_view_signals[SELECTION_CHANGED], 0);
gtk_widget_queue_draw (GTK_WIDGET (view));
}
}
gint
pika_curve_view_get_selected (PikaCurveView *view)
{
g_return_val_if_fail (PIKA_IS_CURVE_VIEW (view), -1);
if (view->curve && view->selected < pika_curve_get_n_points (view->curve))
return view->selected;
else
return -1;
}
void
pika_curve_view_set_range_x (PikaCurveView *view,
gdouble min,
gdouble max)
{
g_return_if_fail (PIKA_IS_CURVE_VIEW (view));
view->range_x_min = min;
view->range_x_max = max;
gtk_widget_queue_draw (GTK_WIDGET (view));
}
void
pika_curve_view_set_range_y (PikaCurveView *view,
gdouble min,
gdouble max)
{
g_return_if_fail (PIKA_IS_CURVE_VIEW (view));
view->range_y_min = min;
view->range_y_max = max;
gtk_widget_queue_draw (GTK_WIDGET (view));
}
void
pika_curve_view_set_xpos (PikaCurveView *view,
gdouble x)
{
g_return_if_fail (PIKA_IS_CURVE_VIEW (view));
view->xpos = x;
gtk_widget_queue_draw (GTK_WIDGET (view));
}
void
pika_curve_view_set_x_axis_label (PikaCurveView *view,
const gchar *label)
{
g_return_if_fail (PIKA_IS_CURVE_VIEW (view));
if (view->x_axis_label)
g_free (view->x_axis_label);
view->x_axis_label = g_strdup (label);
g_object_notify (G_OBJECT (view), "x-axis-label");
gtk_widget_queue_draw (GTK_WIDGET (view));
}
void
pika_curve_view_set_y_axis_label (PikaCurveView *view,
const gchar *label)
{
g_return_if_fail (PIKA_IS_CURVE_VIEW (view));
if (view->y_axis_label)
g_free (view->y_axis_label);
view->y_axis_label = g_strdup (label);
g_object_notify (G_OBJECT (view), "y-axis-label");
gtk_widget_queue_draw (GTK_WIDGET (view));
}
/* private functions */
static void
pika_curve_view_set_cursor (PikaCurveView *view,
gdouble x,
gdouble y)
{
view->cursor_x = x;
view->cursor_y = y;
/* TODO: only invalidate the cursor label area */
gtk_widget_queue_draw (GTK_WIDGET (view));
}
static void
pika_curve_view_unset_cursor (PikaCurveView *view)
{
view->cursor_x = -1.0;
view->cursor_y = -1.0;
/* TODO: only invalidate the cursor label area */
gtk_widget_queue_draw (GTK_WIDGET (view));
}