419 lines
12 KiB
C
419 lines
12 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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* pikacanvasgrid.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 "libpikaconfig/pikaconfig.h"
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#include "display-types.h"
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#include "core/pikagrid.h"
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#include "core/pikaimage.h"
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#include "pikacanvas-style.h"
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#include "pikacanvasgrid.h"
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#include "pikacanvasitem-utils.h"
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#include "pikadisplayshell.h"
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#include "pikadisplayshell-scale.h"
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enum
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{
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PROP_0,
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PROP_GRID,
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PROP_GRID_STYLE
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};
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typedef struct _PikaCanvasGridPrivate PikaCanvasGridPrivate;
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struct _PikaCanvasGridPrivate
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{
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PikaGrid *grid;
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gboolean grid_style;
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};
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#define GET_PRIVATE(grid) \
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((PikaCanvasGridPrivate *) pika_canvas_grid_get_instance_private ((PikaCanvasGrid *) (grid)))
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/* local function prototypes */
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static void pika_canvas_grid_finalize (GObject *object);
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static void pika_canvas_grid_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_grid_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_grid_draw (PikaCanvasItem *item,
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cairo_t *cr);
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static cairo_region_t * pika_canvas_grid_get_extents (PikaCanvasItem *item);
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static void pika_canvas_grid_stroke (PikaCanvasItem *item,
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cairo_t *cr);
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G_DEFINE_TYPE_WITH_PRIVATE (PikaCanvasGrid, pika_canvas_grid,
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PIKA_TYPE_CANVAS_ITEM)
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#define parent_class pika_canvas_grid_parent_class
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static void
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pika_canvas_grid_class_init (PikaCanvasGridClass *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->finalize = pika_canvas_grid_finalize;
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object_class->set_property = pika_canvas_grid_set_property;
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object_class->get_property = pika_canvas_grid_get_property;
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item_class->draw = pika_canvas_grid_draw;
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item_class->get_extents = pika_canvas_grid_get_extents;
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item_class->stroke = pika_canvas_grid_stroke;
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g_object_class_install_property (object_class, PROP_GRID,
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g_param_spec_object ("grid", NULL, NULL,
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PIKA_TYPE_GRID,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_GRID_STYLE,
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g_param_spec_boolean ("grid-style",
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NULL, NULL,
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FALSE,
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PIKA_PARAM_READWRITE));
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}
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static void
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pika_canvas_grid_init (PikaCanvasGrid *grid)
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{
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PikaCanvasGridPrivate *private = GET_PRIVATE (grid);
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private->grid = g_object_new (PIKA_TYPE_GRID, NULL);
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}
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static void
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pika_canvas_grid_finalize (GObject *object)
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{
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PikaCanvasGridPrivate *private = GET_PRIVATE (object);
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g_clear_object (&private->grid);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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pika_canvas_grid_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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PikaCanvasGridPrivate *private = GET_PRIVATE (object);
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switch (property_id)
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{
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case PROP_GRID:
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{
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PikaGrid *grid = g_value_get_object (value);
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if (grid)
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pika_config_sync (G_OBJECT (grid), G_OBJECT (private->grid), 0);
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}
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break;
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case PROP_GRID_STYLE:
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private->grid_style = g_value_get_boolean (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_grid_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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PikaCanvasGridPrivate *private = GET_PRIVATE (object);
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switch (property_id)
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{
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case PROP_GRID:
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g_value_set_object (value, private->grid);
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break;
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case PROP_GRID_STYLE:
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g_value_set_boolean (value, private->grid_style);
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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_grid_draw (PikaCanvasItem *item,
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cairo_t *cr)
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{
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PikaCanvasGridPrivate *private = GET_PRIVATE (item);
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PikaDisplayShell *shell = pika_canvas_item_get_shell (item);
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gdouble xspacing, yspacing;
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gdouble xoffset, yoffset;
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gboolean vert, horz;
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gdouble dx1, dy1, dx2, dy2;
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gint x1, y1, x2, y2;
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gdouble dx, dy;
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gint x, y;
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#define CROSSHAIR 2
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pika_grid_get_spacing (private->grid, &xspacing, &yspacing);
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pika_grid_get_offset (private->grid, &xoffset, &yoffset);
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g_return_if_fail (xspacing >= 0.0 &&
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yspacing >= 0.0);
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xspacing *= shell->scale_x;
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yspacing *= shell->scale_y;
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xoffset *= shell->scale_x;
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yoffset *= shell->scale_y;
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/* skip grid drawing when the space between grid lines starts
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* disappearing, see bug #599267.
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*/
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vert = (xspacing >= 2.0);
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horz = (yspacing >= 2.0);
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if (! vert && ! horz)
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return;
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cairo_clip_extents (cr, &dx1, &dy1, &dx2, &dy2);
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x1 = floor (dx1) - 1;
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y1 = floor (dy1) - 1;
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x2 = ceil (dx2) + 1;
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y2 = ceil (dy2) + 1;
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if (! pika_display_shell_get_infinite_canvas (shell))
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{
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GeglRectangle bounds;
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pika_display_shell_scale_get_image_unrotated_bounds (
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shell,
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&bounds.x, &bounds.y, &bounds.width, &bounds.height);
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if (! gegl_rectangle_intersect (&bounds,
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&bounds,
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GEGL_RECTANGLE (x1, y1,
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x2 - x1, y2 - y1)))
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{
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return;
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}
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x1 = bounds.x;
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y1 = bounds.y;
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x2 = bounds.x + bounds.width;
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y2 = bounds.y + bounds.height;
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}
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switch (pika_grid_get_style (private->grid))
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{
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case PIKA_GRID_INTERSECTIONS:
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x1 -= CROSSHAIR;
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y1 -= CROSSHAIR;
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x2 += CROSSHAIR;
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y2 += CROSSHAIR;
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break;
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case PIKA_GRID_DOTS:
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case PIKA_GRID_ON_OFF_DASH:
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case PIKA_GRID_DOUBLE_DASH:
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case PIKA_GRID_SOLID:
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break;
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}
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xoffset = fmod (xoffset - shell->offset_x - x1, xspacing);
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yoffset = fmod (yoffset - shell->offset_y - y1, yspacing);
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if (xoffset < 0.0)
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xoffset += xspacing;
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if (yoffset < 0.0)
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yoffset += yspacing;
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switch (pika_grid_get_style (private->grid))
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{
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case PIKA_GRID_DOTS:
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if (vert && horz)
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{
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for (dx = x1 + xoffset; dx <= x2; dx += xspacing)
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{
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x = RINT (dx);
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for (dy = y1 + yoffset; dy <= y2; dy += yspacing)
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{
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y = RINT (dy);
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cairo_move_to (cr, x, y + 0.5);
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cairo_line_to (cr, x + 1.0, y + 0.5);
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}
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}
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}
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break;
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case PIKA_GRID_INTERSECTIONS:
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if (vert && horz)
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{
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for (dx = x1 + xoffset; dx <= x2; dx += xspacing)
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{
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x = RINT (dx);
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for (dy = y1 + yoffset; dy <= y2; dy += yspacing)
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{
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y = RINT (dy);
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cairo_move_to (cr, x + 0.5, y - CROSSHAIR);
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cairo_line_to (cr, x + 0.5, y + CROSSHAIR + 1.0);
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cairo_move_to (cr, x - CROSSHAIR, y + 0.5);
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cairo_line_to (cr, x + CROSSHAIR + 1.0, y + 0.5);
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}
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}
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}
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break;
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case PIKA_GRID_ON_OFF_DASH:
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case PIKA_GRID_DOUBLE_DASH:
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case PIKA_GRID_SOLID:
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if (vert)
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{
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for (dx = x1 + xoffset; dx < x2; dx += xspacing)
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{
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x = RINT (dx);
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cairo_move_to (cr, x + 0.5, y1);
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cairo_line_to (cr, x + 0.5, y2);
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}
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}
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if (horz)
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{
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for (dy = y1 + yoffset; dy < y2; dy += yspacing)
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{
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y = RINT (dy);
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cairo_move_to (cr, x1, y + 0.5);
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cairo_line_to (cr, x2, y + 0.5);
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}
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}
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break;
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}
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_pika_canvas_item_stroke (item, cr);
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}
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static cairo_region_t *
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pika_canvas_grid_get_extents (PikaCanvasItem *item)
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{
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PikaDisplayShell *shell = pika_canvas_item_get_shell (item);
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PikaImage *image = pika_canvas_item_get_image (item);
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cairo_rectangle_int_t rectangle;
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if (! image)
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return NULL;
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if (! pika_display_shell_get_infinite_canvas (shell))
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{
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gdouble x1, y1;
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gdouble x2, y2;
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gint w, h;
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w = pika_image_get_width (image);
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h = pika_image_get_height (image);
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pika_canvas_item_transform_xy_f (item, 0, 0, &x1, &y1);
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pika_canvas_item_transform_xy_f (item, w, h, &x2, &y2);
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rectangle.x = floor (x1);
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rectangle.y = floor (y1);
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rectangle.width = ceil (x2) - rectangle.x;
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rectangle.height = ceil (y2) - rectangle.y;
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}
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else
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{
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pika_canvas_item_untransform_viewport (item,
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&rectangle.x,
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&rectangle.y,
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&rectangle.width,
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&rectangle.height);
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}
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return cairo_region_create_rectangle (&rectangle);
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}
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static void
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pika_canvas_grid_stroke (PikaCanvasItem *item,
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cairo_t *cr)
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{
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PikaCanvasGridPrivate *private = GET_PRIVATE (item);
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if (private->grid_style)
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{
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PikaDisplayShell *shell = pika_canvas_item_get_shell (item);
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pika_canvas_set_grid_style (pika_canvas_item_get_canvas (item), cr,
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private->grid,
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shell->offset_x, shell->offset_y);
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cairo_stroke (cr);
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}
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else
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{
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PIKA_CANVAS_ITEM_CLASS (parent_class)->stroke (item, cr);
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}
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}
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PikaCanvasItem *
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pika_canvas_grid_new (PikaDisplayShell *shell,
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PikaGrid *grid)
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{
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g_return_val_if_fail (PIKA_IS_DISPLAY_SHELL (shell), NULL);
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g_return_val_if_fail (grid == NULL || PIKA_IS_GRID (grid), NULL);
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return g_object_new (PIKA_TYPE_CANVAS_GRID,
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"shell", shell,
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"grid", grid,
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NULL);
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}
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