mirror of https://github.com/GNOME/gimp.git
401 lines
12 KiB
C
401 lines
12 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* gimpcanvasgrid.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 <http://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 "libgimpbase/gimpbase.h"
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#include "libgimpmath/gimpmath.h"
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#include "libgimpconfig/gimpconfig.h"
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#include "display-types.h"
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#include "core/gimpgrid.h"
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#include "core/gimpimage.h"
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#include "gimpcanvasgrid.h"
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#include "gimpdisplay.h"
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#include "gimpdisplayshell.h"
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#include "gimpdisplayshell-style.h"
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#include "gimpdisplayshell-transform.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 _GimpCanvasGridPrivate GimpCanvasGridPrivate;
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struct _GimpCanvasGridPrivate
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{
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GimpGrid *grid;
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gboolean grid_style;
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};
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#define GET_PRIVATE(grid) \
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G_TYPE_INSTANCE_GET_PRIVATE (grid, \
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GIMP_TYPE_CANVAS_GRID, \
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GimpCanvasGridPrivate)
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/* local function prototypes */
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static void gimp_canvas_grid_finalize (GObject *object);
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static void gimp_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 gimp_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 gimp_canvas_grid_draw (GimpCanvasItem *item,
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GimpDisplayShell *shell,
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cairo_t *cr);
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static cairo_region_t * gimp_canvas_grid_get_extents (GimpCanvasItem *item,
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GimpDisplayShell *shell);
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static void gimp_canvas_grid_stroke (GimpCanvasItem *item,
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GimpDisplayShell *shell,
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cairo_t *cr);
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G_DEFINE_TYPE (GimpCanvasGrid, gimp_canvas_grid, GIMP_TYPE_CANVAS_ITEM)
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#define parent_class gimp_canvas_grid_parent_class
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static void
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gimp_canvas_grid_class_init (GimpCanvasGridClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
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object_class->finalize = gimp_canvas_grid_finalize;
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object_class->set_property = gimp_canvas_grid_set_property;
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object_class->get_property = gimp_canvas_grid_get_property;
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item_class->draw = gimp_canvas_grid_draw;
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item_class->get_extents = gimp_canvas_grid_get_extents;
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item_class->stroke = gimp_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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GIMP_TYPE_GRID,
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GIMP_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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GIMP_PARAM_READWRITE));
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g_type_class_add_private (klass, sizeof (GimpCanvasGridPrivate));
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}
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static void
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gimp_canvas_grid_init (GimpCanvasGrid *grid)
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{
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GimpCanvasGridPrivate *private = GET_PRIVATE (grid);
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private->grid = g_object_new (GIMP_TYPE_GRID, NULL);
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}
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static void
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gimp_canvas_grid_finalize (GObject *object)
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{
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GimpCanvasGridPrivate *private = GET_PRIVATE (object);
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if (private->grid)
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{
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g_object_unref (private->grid);
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private->grid = NULL;
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}
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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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gimp_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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GimpCanvasGridPrivate *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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GimpGrid *grid = g_value_get_object (value);
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if (grid)
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gimp_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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gimp_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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GimpCanvasGridPrivate *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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gimp_canvas_grid_draw (GimpCanvasItem *item,
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GimpDisplayShell *shell,
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cairo_t *cr)
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{
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GimpCanvasGridPrivate *private = GET_PRIVATE (item);
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GimpImage *image = gimp_display_get_image (shell->display);
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gdouble x, y;
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gdouble dx1, dy1, dx2, dy2;
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gint x0, x1, x2, x3;
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gint y0, y1, y2, y3;
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gint x_real, y_real;
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gdouble x_offset, y_offset;
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gint width, height;
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#define CROSSHAIR 2
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g_return_if_fail (private->grid->xspacing > 0 && private->grid->yspacing > 0);
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cairo_clip_extents (cr, &dx1, &dy1, &dx2, &dy2);
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x1 = floor (dx1);
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y1 = floor (dy1);
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x2 = ceil (dx2);
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y2 = ceil (dy2);
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width = gimp_image_get_width (image);
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height = gimp_image_get_height (image);
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x_offset = private->grid->xoffset;
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while (x_offset > 0)
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x_offset -= private->grid->xspacing;
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y_offset = private->grid->yoffset;
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while (y_offset > 0)
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y_offset -= private->grid->yspacing;
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switch (private->grid->style)
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{
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case GIMP_GRID_DOTS:
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for (x = x_offset; x <= width; x += private->grid->xspacing)
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{
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if (x < 0)
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continue;
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gimp_display_shell_transform_xy (shell, x, 0, &x_real, &y_real);
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if (x_real < x1 || x_real >= x2)
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continue;
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for (y = y_offset; y <= height; y += private->grid->yspacing)
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{
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if (y < 0)
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continue;
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gimp_display_shell_transform_xy (shell, x, y, &x_real, &y_real);
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if (y_real >= y1 && y_real < y2)
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{
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cairo_move_to (cr, x_real, y_real + 0.5);
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cairo_line_to (cr, x_real + 1, y_real + 0.5);
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}
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}
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}
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break;
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case GIMP_GRID_INTERSECTIONS:
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for (x = x_offset; x <= width; x += private->grid->xspacing)
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{
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if (x < 0)
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continue;
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gimp_display_shell_transform_xy (shell, x, 0, &x_real, &y_real);
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if (x_real + CROSSHAIR < x1 || x_real - CROSSHAIR >= x2)
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continue;
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for (y = y_offset; y <= height; y += private->grid->yspacing)
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{
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if (y < 0)
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continue;
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gimp_display_shell_transform_xy (shell, x, y, &x_real, &y_real);
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if (y_real + CROSSHAIR < y1 || y_real - CROSSHAIR >= y2)
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continue;
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if (x_real >= x1 && x_real < x2)
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{
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cairo_move_to (cr,
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x_real + 0.5,
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CLAMP (y_real - CROSSHAIR,
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y1, y2 - 1));
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cairo_line_to (cr,
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x_real + 0.5,
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CLAMP (y_real + CROSSHAIR,
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y1, y2 - 1) + 1);
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}
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if (y_real >= y1 && y_real < y2)
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{
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cairo_move_to (cr,
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CLAMP (x_real - CROSSHAIR,
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x1, x2 - 1),
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y_real + 0.5);
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cairo_line_to (cr,
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CLAMP (x_real + CROSSHAIR,
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x1, x2 - 1) + 1,
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y_real + 0.5);
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}
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}
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}
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break;
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case GIMP_GRID_ON_OFF_DASH:
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case GIMP_GRID_DOUBLE_DASH:
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case GIMP_GRID_SOLID:
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gimp_display_shell_transform_xy (shell, 0, 0, &x0, &y0);
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gimp_display_shell_transform_xy (shell, width, height, &x3, &y3);
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for (x = x_offset; x < width; x += private->grid->xspacing)
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{
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if (x < 0)
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continue;
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gimp_display_shell_transform_xy (shell, x, 0, &x_real, &y_real);
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if (x_real >= x1 && x_real < x2)
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{
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cairo_move_to (cr, x_real + 0.5, y0);
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cairo_line_to (cr, x_real + 0.5, y3 + 1);
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}
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}
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for (y = y_offset; y < height; y += private->grid->yspacing)
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{
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if (y < 0)
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continue;
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gimp_display_shell_transform_xy (shell, 0, y, &x_real, &y_real);
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if (y_real >= y1 && y_real < y2)
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{
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cairo_move_to (cr, x0, y_real + 0.5);
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cairo_line_to (cr, x3 + 1, y_real + 0.5);
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}
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}
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break;
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}
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_gimp_canvas_item_stroke (item, cr);
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}
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static cairo_region_t *
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gimp_canvas_grid_get_extents (GimpCanvasItem *item,
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GimpDisplayShell *shell)
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{
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GimpImage *image = gimp_display_get_image (shell->display);
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cairo_rectangle_int_t rectangle;
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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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if (! image)
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return NULL;
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w = gimp_image_get_width (image);
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h = gimp_image_get_height (image);
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gimp_display_shell_transform_xy_f (shell, 0, 0, &x1, &y1);
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gimp_display_shell_transform_xy_f (shell, 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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return cairo_region_create_rectangle (&rectangle);
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}
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static void
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gimp_canvas_grid_stroke (GimpCanvasItem *item,
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GimpDisplayShell *shell,
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cairo_t *cr)
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{
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GimpCanvasGridPrivate *private = GET_PRIVATE (item);
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if (private->grid_style)
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{
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cairo_translate (cr, -shell->offset_x, -shell->offset_y);
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gimp_display_shell_set_grid_style (shell, cr, private->grid);
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cairo_stroke (cr);
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}
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else
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{
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GIMP_CANVAS_ITEM_CLASS (parent_class)->stroke (item, shell, cr);
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}
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}
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GimpCanvasItem *
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gimp_canvas_grid_new (GimpDisplayShell *shell,
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GimpGrid *grid)
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{
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g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
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g_return_val_if_fail (grid == NULL || GIMP_IS_GRID (grid), NULL);
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return g_object_new (GIMP_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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