734 lines
23 KiB
C
734 lines
23 KiB
C
/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* pikacanvashandle.c
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* Copyright (C) 2010 Michael Natterer <mitch@gimp.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gegl.h>
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#include <gtk/gtk.h>
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#include "libpikabase/pikabase.h"
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#include "libpikamath/pikamath.h"
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#include "display-types.h"
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#include "core/pika-cairo.h"
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#include "pikacanvashandle.h"
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#include "pikacanvasitem-utils.h"
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#include "pikadisplayshell.h"
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#define N_DASHES 8
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#define DASH_ON_RATIO 0.3
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#define DASH_OFF_RATIO 0.7
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enum
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{
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PROP_0,
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PROP_TYPE,
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PROP_ANCHOR,
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PROP_X,
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PROP_Y,
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PROP_WIDTH,
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PROP_HEIGHT,
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PROP_START_ANGLE,
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PROP_SLICE_ANGLE
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};
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typedef struct _PikaCanvasHandlePrivate PikaCanvasHandlePrivate;
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struct _PikaCanvasHandlePrivate
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{
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PikaHandleType type;
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PikaHandleAnchor anchor;
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gdouble x;
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gdouble y;
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gint width;
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gint height;
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gdouble start_angle;
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gdouble slice_angle;
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};
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#define GET_PRIVATE(handle) \
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((PikaCanvasHandlePrivate *) pika_canvas_handle_get_instance_private ((PikaCanvasHandle *) (handle)))
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/* local function prototypes */
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static void pika_canvas_handle_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec);
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static void pika_canvas_handle_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec);
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static void pika_canvas_handle_draw (PikaCanvasItem *item,
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cairo_t *cr);
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static cairo_region_t * pika_canvas_handle_get_extents (PikaCanvasItem *item);
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static gboolean pika_canvas_handle_hit (PikaCanvasItem *item,
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gdouble x,
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gdouble y);
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G_DEFINE_TYPE_WITH_PRIVATE (PikaCanvasHandle, pika_canvas_handle,
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PIKA_TYPE_CANVAS_ITEM)
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#define parent_class pika_canvas_handle_parent_class
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static void
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pika_canvas_handle_class_init (PikaCanvasHandleClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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PikaCanvasItemClass *item_class = PIKA_CANVAS_ITEM_CLASS (klass);
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object_class->set_property = pika_canvas_handle_set_property;
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object_class->get_property = pika_canvas_handle_get_property;
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item_class->draw = pika_canvas_handle_draw;
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item_class->get_extents = pika_canvas_handle_get_extents;
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item_class->hit = pika_canvas_handle_hit;
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g_object_class_install_property (object_class, PROP_TYPE,
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g_param_spec_enum ("type", NULL, NULL,
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PIKA_TYPE_HANDLE_TYPE,
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PIKA_HANDLE_CROSS,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_ANCHOR,
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g_param_spec_enum ("anchor", NULL, NULL,
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PIKA_TYPE_HANDLE_ANCHOR,
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PIKA_HANDLE_ANCHOR_CENTER,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_X,
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g_param_spec_double ("x", NULL, NULL,
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-PIKA_MAX_IMAGE_SIZE,
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PIKA_MAX_IMAGE_SIZE, 0,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_Y,
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g_param_spec_double ("y", NULL, NULL,
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-PIKA_MAX_IMAGE_SIZE,
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PIKA_MAX_IMAGE_SIZE, 0,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_WIDTH,
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g_param_spec_int ("width", NULL, NULL,
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3, 1001, 7,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_HEIGHT,
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g_param_spec_int ("height", NULL, NULL,
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3, 1001, 7,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_START_ANGLE,
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g_param_spec_double ("start-angle", NULL, NULL,
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-1000, 1000, 0,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_SLICE_ANGLE,
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g_param_spec_double ("slice-angle", NULL, NULL,
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-1000, 1000, 2 * G_PI,
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PIKA_PARAM_READWRITE));
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}
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static void
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pika_canvas_handle_init (PikaCanvasHandle *handle)
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{
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PikaCanvasHandlePrivate *private = GET_PRIVATE (handle);
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pika_canvas_item_set_line_cap (PIKA_CANVAS_ITEM (handle),
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CAIRO_LINE_CAP_SQUARE);
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private->start_angle = 0.0;
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private->slice_angle = 2.0 * G_PI;
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}
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static void
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pika_canvas_handle_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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PikaCanvasHandlePrivate *private = GET_PRIVATE (object);
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switch (property_id)
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{
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case PROP_TYPE:
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private->type = g_value_get_enum (value);
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break;
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case PROP_ANCHOR:
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private->anchor = g_value_get_enum (value);
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break;
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case PROP_X:
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private->x = g_value_get_double (value);
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break;
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case PROP_Y:
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private->y = g_value_get_double (value);
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break;
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case PROP_WIDTH:
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private->width = g_value_get_int (value);
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break;
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case PROP_HEIGHT:
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private->height = g_value_get_int (value);
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break;
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case PROP_START_ANGLE:
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private->start_angle = g_value_get_double (value);
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break;
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case PROP_SLICE_ANGLE:
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private->slice_angle = g_value_get_double (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static void
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pika_canvas_handle_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec)
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{
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PikaCanvasHandlePrivate *private = GET_PRIVATE (object);
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switch (property_id)
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{
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case PROP_TYPE:
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g_value_set_enum (value, private->type);
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break;
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case PROP_ANCHOR:
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g_value_set_enum (value, private->anchor);
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break;
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case PROP_X:
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g_value_set_double (value, private->x);
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break;
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case PROP_Y:
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g_value_set_double (value, private->y);
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break;
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case PROP_WIDTH:
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g_value_set_int (value, private->width);
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break;
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case PROP_HEIGHT:
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g_value_set_int (value, private->height);
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break;
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case PROP_START_ANGLE:
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g_value_set_double (value, private->start_angle);
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break;
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case PROP_SLICE_ANGLE:
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g_value_set_double (value, private->slice_angle);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static void
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pika_canvas_handle_transform (PikaCanvasItem *item,
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gdouble *x,
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gdouble *y)
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{
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PikaCanvasHandlePrivate *private = GET_PRIVATE (item);
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pika_canvas_item_transform_xy_f (item,
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private->x, private->y,
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x, y);
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switch (private->type)
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{
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case PIKA_HANDLE_SQUARE:
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case PIKA_HANDLE_DASHED_SQUARE:
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case PIKA_HANDLE_FILLED_SQUARE:
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pika_canvas_item_shift_to_north_west (private->anchor,
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*x, *y,
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private->width,
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private->height,
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x, y);
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break;
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case PIKA_HANDLE_CIRCLE:
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case PIKA_HANDLE_DASHED_CIRCLE:
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case PIKA_HANDLE_FILLED_CIRCLE:
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case PIKA_HANDLE_CROSS:
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case PIKA_HANDLE_CROSSHAIR:
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case PIKA_HANDLE_DIAMOND:
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case PIKA_HANDLE_DASHED_DIAMOND:
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case PIKA_HANDLE_FILLED_DIAMOND:
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case PIKA_HANDLE_DROP:
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case PIKA_HANDLE_FILLED_DROP:
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pika_canvas_item_shift_to_center (private->anchor,
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*x, *y,
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private->width,
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private->height,
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x, y);
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break;
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default:
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break;
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}
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*x = floor (*x) + 0.5;
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*y = floor (*y) + 0.5;
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}
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static void
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pika_canvas_handle_draw (PikaCanvasItem *item,
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cairo_t *cr)
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{
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PikaCanvasHandlePrivate *private = GET_PRIVATE (item);
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gdouble x, y, tx, ty;
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pika_canvas_handle_transform (item, &x, &y);
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pika_canvas_item_transform_xy_f (item,
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private->x, private->y,
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&tx, &ty);
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tx = floor (tx) + 0.5;
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ty = floor (ty) + 0.5;
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switch (private->type)
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{
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case PIKA_HANDLE_SQUARE:
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case PIKA_HANDLE_DASHED_SQUARE:
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case PIKA_HANDLE_FILLED_SQUARE:
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case PIKA_HANDLE_DIAMOND:
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case PIKA_HANDLE_DASHED_DIAMOND:
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case PIKA_HANDLE_FILLED_DIAMOND:
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case PIKA_HANDLE_CROSS:
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case PIKA_HANDLE_DROP:
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case PIKA_HANDLE_FILLED_DROP:
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cairo_save (cr);
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cairo_translate (cr, tx, ty);
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cairo_rotate (cr, private->start_angle);
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cairo_translate (cr, -tx, -ty);
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switch (private->type)
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{
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case PIKA_HANDLE_SQUARE:
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case PIKA_HANDLE_DASHED_SQUARE:
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if (private->type == PIKA_HANDLE_DASHED_SQUARE)
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{
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gdouble circ;
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gdouble dashes[2];
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cairo_save (cr);
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circ = 2.0 * ((private->width - 1.0) + (private->height - 1.0));
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dashes[0] = (circ / N_DASHES) * DASH_ON_RATIO;
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dashes[1] = (circ / N_DASHES) * DASH_OFF_RATIO;
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cairo_set_dash (cr, dashes, 2, dashes[0] / 2.0);
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}
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cairo_rectangle (cr, x, y, private->width - 1.0, private->height - 1.0);
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_pika_canvas_item_stroke (item, cr);
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if (private->type == PIKA_HANDLE_DASHED_SQUARE)
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cairo_restore (cr);
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break;
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case PIKA_HANDLE_FILLED_SQUARE:
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cairo_rectangle (cr, x - 0.5, y - 0.5, private->width, private->height);
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_pika_canvas_item_fill (item, cr);
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break;
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case PIKA_HANDLE_DIAMOND:
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case PIKA_HANDLE_DASHED_DIAMOND:
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case PIKA_HANDLE_FILLED_DIAMOND:
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if (private->type == PIKA_HANDLE_DASHED_DIAMOND)
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{
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gdouble circ;
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gdouble dashes[2];
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cairo_save (cr);
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circ = 4.0 * hypot ((gdouble) private->width / 2.0,
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(gdouble) private->height / 2.0);
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dashes[0] = (circ / N_DASHES) * DASH_ON_RATIO;
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dashes[1] = (circ / N_DASHES) * DASH_OFF_RATIO;
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cairo_set_dash (cr, dashes, 2, dashes[0] / 2.0);
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}
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cairo_move_to (cr, x, y - (gdouble) private->height / 2.0);
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cairo_line_to (cr, x + (gdouble) private->width / 2.0, y);
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cairo_line_to (cr, x, y + (gdouble) private->height / 2.0);
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cairo_line_to (cr, x - (gdouble) private->width / 2.0, y);
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cairo_line_to (cr, x, y - (gdouble) private->height / 2.0);
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if (private->type == PIKA_HANDLE_DIAMOND ||
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private->type == PIKA_HANDLE_DASHED_DIAMOND)
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_pika_canvas_item_stroke (item, cr);
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else
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_pika_canvas_item_fill (item, cr);
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if (private->type == PIKA_HANDLE_DASHED_SQUARE)
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cairo_restore (cr);
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break;
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case PIKA_HANDLE_CROSS:
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cairo_move_to (cr, x - private->width / 2.0, y);
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cairo_line_to (cr, x + private->width / 2.0 - 0.5, y);
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cairo_move_to (cr, x, y - private->height / 2.0);
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cairo_line_to (cr, x, y + private->height / 2.0 - 0.5);
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_pika_canvas_item_stroke (item, cr);
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break;
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case PIKA_HANDLE_DROP:
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case PIKA_HANDLE_FILLED_DROP:
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cairo_move_to (cr, x + private->width, y);
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pika_cairo_arc (cr, x, y, (gdouble) private->width / 2.0,
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G_PI / 3, G_PI * 4 / 3.);
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cairo_close_path (cr);
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if (private->type == PIKA_HANDLE_DROP)
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_pika_canvas_item_stroke (item, cr);
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else
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_pika_canvas_item_fill (item, cr);
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break;
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default:
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pika_assert_not_reached ();
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}
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cairo_restore (cr);
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break;
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case PIKA_HANDLE_CIRCLE:
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case PIKA_HANDLE_DASHED_CIRCLE:
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if (private->type == PIKA_HANDLE_DASHED_CIRCLE)
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{
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gdouble circ;
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gdouble dashes[2];
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cairo_save (cr);
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circ = 2.0 * G_PI * (private->width / 2.0);
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dashes[0] = (circ / N_DASHES) * DASH_ON_RATIO;
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dashes[1] = (circ / N_DASHES) * DASH_OFF_RATIO;
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cairo_set_dash (cr, dashes, 2, dashes[0] / 2.0);
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}
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pika_cairo_arc (cr, x, y, private->width / 2.0,
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private->start_angle,
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private->slice_angle);
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_pika_canvas_item_stroke (item, cr);
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if (private->type == PIKA_HANDLE_DASHED_CIRCLE)
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cairo_restore (cr);
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break;
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case PIKA_HANDLE_FILLED_CIRCLE:
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cairo_move_to (cr, x, y);
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pika_cairo_arc (cr, x, y, (gdouble) private->width / 2.0,
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private->start_angle,
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private->slice_angle);
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_pika_canvas_item_fill (item, cr);
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break;
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case PIKA_HANDLE_CROSSHAIR:
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cairo_move_to (cr, x - private->width / 2.0, y);
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cairo_line_to (cr, x - private->width * 0.4, y);
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cairo_move_to (cr, x + private->width / 2.0 - 0.5, y);
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cairo_line_to (cr, x + private->width * 0.4, y);
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cairo_move_to (cr, x, y - private->height / 2.0);
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cairo_line_to (cr, x, y - private->height * 0.4 - 0.5);
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cairo_move_to (cr, x, y + private->height / 2.0 - 0.5);
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cairo_line_to (cr, x, y + private->height * 0.4 - 0.5);
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|
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_pika_canvas_item_stroke (item, cr);
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break;
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|
|
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default:
|
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break;
|
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}
|
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}
|
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|
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static cairo_region_t *
|
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pika_canvas_handle_get_extents (PikaCanvasItem *item)
|
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{
|
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PikaCanvasHandlePrivate *private = GET_PRIVATE (item);
|
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cairo_rectangle_int_t rectangle;
|
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gdouble x, y;
|
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gdouble w, h;
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|
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pika_canvas_handle_transform (item, &x, &y);
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|
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switch (private->type)
|
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{
|
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case PIKA_HANDLE_SQUARE:
|
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case PIKA_HANDLE_DASHED_SQUARE:
|
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case PIKA_HANDLE_FILLED_SQUARE:
|
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w = private->width * (sqrt(2) - 1) / 2;
|
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h = private->height * (sqrt(2) - 1) / 2;
|
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rectangle.x = x - 1.5 - w;
|
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rectangle.y = y - 1.5 - h;
|
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rectangle.width = private->width + 3.0 + w * 2;
|
|
rectangle.height = private->height + 3.0 + h * 2;
|
|
break;
|
|
|
|
case PIKA_HANDLE_CIRCLE:
|
|
case PIKA_HANDLE_DASHED_CIRCLE:
|
|
case PIKA_HANDLE_FILLED_CIRCLE:
|
|
case PIKA_HANDLE_CROSS:
|
|
case PIKA_HANDLE_CROSSHAIR:
|
|
case PIKA_HANDLE_DIAMOND:
|
|
case PIKA_HANDLE_DASHED_DIAMOND:
|
|
case PIKA_HANDLE_FILLED_DIAMOND:
|
|
rectangle.x = x - private->width / 2.0 - 2.0;
|
|
rectangle.y = y - private->height / 2.0 - 2.0;
|
|
rectangle.width = private->width + 4.0;
|
|
rectangle.height = private->height + 4.0;
|
|
break;
|
|
|
|
case PIKA_HANDLE_DROP:
|
|
case PIKA_HANDLE_FILLED_DROP:
|
|
rectangle.x = x - private->width / 2.0 - 2.0;
|
|
rectangle.y = y - private->height / 2.0 - 2.0;
|
|
rectangle.width = private->width * 1.5 + 4.0;
|
|
rectangle.height = private->height + 4.0;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return cairo_region_create_rectangle (&rectangle);
|
|
}
|
|
|
|
static gboolean
|
|
pika_canvas_handle_hit (PikaCanvasItem *item,
|
|
gdouble x,
|
|
gdouble y)
|
|
{
|
|
PikaCanvasHandlePrivate *private = GET_PRIVATE (item);
|
|
gdouble handle_tx, handle_ty;
|
|
gdouble mx, my, tx, ty, mmx, mmy;
|
|
gdouble diamond_offset_x = 0.0;
|
|
gdouble diamond_offset_y = 0.0;
|
|
gdouble angle = -private->start_angle;
|
|
|
|
pika_canvas_handle_transform (item, &handle_tx, &handle_ty);
|
|
|
|
pika_canvas_item_transform_xy_f (item,
|
|
x, y,
|
|
&mx, &my);
|
|
|
|
switch (private->type)
|
|
{
|
|
case PIKA_HANDLE_DIAMOND:
|
|
case PIKA_HANDLE_DASHED_DIAMOND:
|
|
case PIKA_HANDLE_FILLED_DIAMOND:
|
|
angle -= G_PI / 4.0;
|
|
diamond_offset_x = private->width / 2.0;
|
|
diamond_offset_y = private->height / 2.0;
|
|
case PIKA_HANDLE_SQUARE:
|
|
case PIKA_HANDLE_DASHED_SQUARE:
|
|
case PIKA_HANDLE_FILLED_SQUARE:
|
|
pika_canvas_item_transform_xy_f (item,
|
|
private->x, private->y,
|
|
&tx, &ty);
|
|
mmx = mx - tx; mmy = my - ty;
|
|
mx = cos (angle) * mmx - sin (angle) * mmy + tx + diamond_offset_x;
|
|
my = sin (angle) * mmx + cos (angle) * mmy + ty + diamond_offset_y;
|
|
return mx > handle_tx && mx < handle_tx + private->width &&
|
|
my > handle_ty && my < handle_ty + private->height;
|
|
|
|
case PIKA_HANDLE_CIRCLE:
|
|
case PIKA_HANDLE_DASHED_CIRCLE:
|
|
case PIKA_HANDLE_FILLED_CIRCLE:
|
|
case PIKA_HANDLE_CROSS:
|
|
case PIKA_HANDLE_CROSSHAIR:
|
|
case PIKA_HANDLE_DROP:
|
|
case PIKA_HANDLE_FILLED_DROP:
|
|
{
|
|
gint width = private->width;
|
|
|
|
if (width != private->height)
|
|
width = (width + private->height) / 2;
|
|
|
|
width /= 2;
|
|
|
|
return ((SQR (handle_tx - mx) + SQR (handle_ty - my)) < SQR (width));
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
PikaCanvasItem *
|
|
pika_canvas_handle_new (PikaDisplayShell *shell,
|
|
PikaHandleType type,
|
|
PikaHandleAnchor anchor,
|
|
gdouble x,
|
|
gdouble y,
|
|
gint width,
|
|
gint height)
|
|
{
|
|
g_return_val_if_fail (PIKA_IS_DISPLAY_SHELL (shell), NULL);
|
|
|
|
return g_object_new (PIKA_TYPE_CANVAS_HANDLE,
|
|
"shell", shell,
|
|
"type", type,
|
|
"anchor", anchor,
|
|
"x", x,
|
|
"y", y,
|
|
"width", width,
|
|
"height", height,
|
|
NULL);
|
|
}
|
|
|
|
void
|
|
pika_canvas_handle_get_position (PikaCanvasItem *handle,
|
|
gdouble *x,
|
|
gdouble *y)
|
|
{
|
|
g_return_if_fail (PIKA_IS_CANVAS_HANDLE (handle));
|
|
g_return_if_fail (x != NULL);
|
|
g_return_if_fail (y != NULL);
|
|
|
|
g_object_get (handle,
|
|
"x", x,
|
|
"y", y,
|
|
NULL);
|
|
}
|
|
|
|
void
|
|
pika_canvas_handle_set_position (PikaCanvasItem *handle,
|
|
gdouble x,
|
|
gdouble y)
|
|
{
|
|
g_return_if_fail (PIKA_IS_CANVAS_HANDLE (handle));
|
|
|
|
pika_canvas_item_begin_change (handle);
|
|
|
|
g_object_set (handle,
|
|
"x", x,
|
|
"y", y,
|
|
NULL);
|
|
|
|
pika_canvas_item_end_change (handle);
|
|
}
|
|
|
|
gint
|
|
pika_canvas_handle_calc_size (PikaCanvasItem *item,
|
|
gdouble mouse_x,
|
|
gdouble mouse_y,
|
|
gint normal_size,
|
|
gint hover_size)
|
|
{
|
|
gdouble x, y;
|
|
gdouble distance;
|
|
gdouble size;
|
|
gint full_threshold_sq = SQR (hover_size / 2) * 9;
|
|
gint partial_threshold_sq = full_threshold_sq * 5;
|
|
|
|
g_return_val_if_fail (PIKA_IS_CANVAS_HANDLE (item), normal_size);
|
|
|
|
pika_canvas_handle_get_position (item, &x, &y);
|
|
distance = pika_canvas_item_transform_distance_square (item,
|
|
mouse_x,
|
|
mouse_y,
|
|
x, y);
|
|
|
|
/* calculate the handle size based on distance from the cursor */
|
|
size = (1.0 - (distance - full_threshold_sq) /
|
|
(partial_threshold_sq - full_threshold_sq));
|
|
|
|
size = CLAMP (size, 0.0, 1.0);
|
|
|
|
return (gint) CLAMP ((size * hover_size),
|
|
normal_size,
|
|
hover_size);
|
|
}
|
|
|
|
void
|
|
pika_canvas_handle_get_size (PikaCanvasItem *handle,
|
|
gint *width,
|
|
gint *height)
|
|
{
|
|
g_return_if_fail (PIKA_IS_CANVAS_HANDLE (handle));
|
|
g_return_if_fail (width != NULL);
|
|
g_return_if_fail (height != NULL);
|
|
|
|
g_object_get (handle,
|
|
"width", width,
|
|
"height", height,
|
|
NULL);
|
|
}
|
|
|
|
void
|
|
pika_canvas_handle_set_size (PikaCanvasItem *handle,
|
|
gint width,
|
|
gint height)
|
|
{
|
|
g_return_if_fail (PIKA_IS_CANVAS_HANDLE (handle));
|
|
|
|
pika_canvas_item_begin_change (handle);
|
|
|
|
g_object_set (handle,
|
|
"width", width,
|
|
"height", height,
|
|
NULL);
|
|
|
|
pika_canvas_item_end_change (handle);
|
|
}
|
|
|
|
void
|
|
pika_canvas_handle_set_angles (PikaCanvasItem *handle,
|
|
gdouble start_angle,
|
|
gdouble slice_angle)
|
|
{
|
|
g_return_if_fail (PIKA_IS_CANVAS_HANDLE (handle));
|
|
|
|
pika_canvas_item_begin_change (handle);
|
|
|
|
g_object_set (handle,
|
|
"start-angle", start_angle,
|
|
"slice-angle", slice_angle,
|
|
NULL);
|
|
|
|
pika_canvas_item_end_change (handle);
|
|
}
|
