mirror of https://github.com/GNOME/gimp.git
282 lines
8.6 KiB
C
282 lines
8.6 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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* gimpcanvasline.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 "libgimpbase/gimpbase.h"
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#include "libgimpmath/gimpmath.h"
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#include "display-types.h"
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#include "gimpcanvasline.h"
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#include "gimpdisplayshell.h"
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enum
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{
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PROP_0,
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PROP_X1,
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PROP_Y1,
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PROP_X2,
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PROP_Y2
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};
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typedef struct _GimpCanvasLinePrivate GimpCanvasLinePrivate;
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struct _GimpCanvasLinePrivate
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{
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gdouble x1;
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gdouble y1;
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gdouble x2;
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gdouble y2;
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};
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#define GET_PRIVATE(line) \
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((GimpCanvasLinePrivate *) gimp_canvas_line_get_instance_private ((GimpCanvasLine *) (line)))
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/* local function prototypes */
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static void gimp_canvas_line_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_line_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_line_draw (GimpCanvasItem *item,
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cairo_t *cr);
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static cairo_region_t * gimp_canvas_line_get_extents (GimpCanvasItem *item);
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G_DEFINE_TYPE_WITH_PRIVATE (GimpCanvasLine, gimp_canvas_line,
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GIMP_TYPE_CANVAS_ITEM)
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#define parent_class gimp_canvas_line_parent_class
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static void
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gimp_canvas_line_class_init (GimpCanvasLineClass *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->set_property = gimp_canvas_line_set_property;
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object_class->get_property = gimp_canvas_line_get_property;
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item_class->draw = gimp_canvas_line_draw;
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item_class->get_extents = gimp_canvas_line_get_extents;
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g_object_class_install_property (object_class, PROP_X1,
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g_param_spec_double ("x1", NULL, NULL,
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-GIMP_MAX_IMAGE_SIZE,
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GIMP_MAX_IMAGE_SIZE, 0,
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GIMP_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_Y1,
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g_param_spec_double ("y1", NULL, NULL,
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-GIMP_MAX_IMAGE_SIZE,
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GIMP_MAX_IMAGE_SIZE, 0,
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GIMP_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_X2,
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g_param_spec_double ("x2", NULL, NULL,
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-GIMP_MAX_IMAGE_SIZE,
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GIMP_MAX_IMAGE_SIZE, 0,
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GIMP_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_Y2,
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g_param_spec_double ("y2", NULL, NULL,
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-GIMP_MAX_IMAGE_SIZE,
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GIMP_MAX_IMAGE_SIZE, 0,
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GIMP_PARAM_READWRITE));
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}
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static void
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gimp_canvas_line_init (GimpCanvasLine *line)
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{
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}
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static void
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gimp_canvas_line_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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GimpCanvasLinePrivate *private = GET_PRIVATE (object);
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switch (property_id)
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{
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case PROP_X1:
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private->x1 = g_value_get_double (value);
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break;
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case PROP_Y1:
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private->y1 = g_value_get_double (value);
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break;
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case PROP_X2:
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private->x2 = g_value_get_double (value);
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break;
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case PROP_Y2:
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private->y2 = 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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gimp_canvas_line_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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GimpCanvasLinePrivate *private = GET_PRIVATE (object);
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switch (property_id)
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{
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case PROP_X1:
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g_value_set_double (value, private->x1);
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break;
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case PROP_Y1:
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g_value_set_double (value, private->y1);
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break;
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case PROP_X2:
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g_value_set_double (value, private->x2);
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break;
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case PROP_Y2:
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g_value_set_double (value, private->y2);
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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_line_transform (GimpCanvasItem *item,
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gdouble *x1,
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gdouble *y1,
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gdouble *x2,
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gdouble *y2)
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{
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GimpCanvasLinePrivate *private = GET_PRIVATE (item);
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gimp_canvas_item_transform_xy_f (item,
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private->x1, private->y1,
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x1, y1);
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gimp_canvas_item_transform_xy_f (item,
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private->x2, private->y2,
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x2, y2);
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*x1 = floor (*x1) + 0.5;
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*y1 = floor (*y1) + 0.5;
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*x2 = floor (*x2) + 0.5;
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*y2 = floor (*y2) + 0.5;
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}
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static void
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gimp_canvas_line_draw (GimpCanvasItem *item,
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cairo_t *cr)
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{
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gdouble x1, y1;
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gdouble x2, y2;
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gimp_canvas_line_transform (item, &x1, &y1, &x2, &y2);
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cairo_move_to (cr, x1, y1);
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cairo_line_to (cr, x2, y2);
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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_line_get_extents (GimpCanvasItem *item)
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{
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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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gimp_canvas_line_transform (item, &x1, &y1, &x2, &y2);
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if (x1 == x2 || y1 == y2)
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{
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rectangle.x = MIN (x1, x2) - 1.5;
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rectangle.y = MIN (y1, y2) - 1.5;
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rectangle.width = ABS (x2 - x1) + 3.0;
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rectangle.height = ABS (y2 - y1) + 3.0;
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}
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else
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{
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rectangle.x = floor (MIN (x1, x2) - 2.5);
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rectangle.y = floor (MIN (y1, y2) - 2.5);
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rectangle.width = ceil (ABS (x2 - x1) + 5.0);
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rectangle.height = ceil (ABS (y2 - y1) + 5.0);
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}
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return cairo_region_create_rectangle (&rectangle);
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}
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GimpCanvasItem *
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gimp_canvas_line_new (GimpDisplayShell *shell,
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gdouble x1,
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gdouble y1,
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gdouble x2,
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gdouble y2)
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{
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g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
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return g_object_new (GIMP_TYPE_CANVAS_LINE,
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"shell", shell,
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"x1", x1,
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"y1", y1,
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"x2", x2,
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"y2", y2,
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NULL);
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}
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void
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gimp_canvas_line_set (GimpCanvasItem *line,
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gdouble x1,
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gdouble y1,
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gdouble x2,
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gdouble y2)
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{
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g_return_if_fail (GIMP_IS_CANVAS_LINE (line));
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gimp_canvas_item_begin_change (line);
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g_object_set (line,
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"x1", x1,
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"y1", y1,
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"x2", x2,
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"y2", y2,
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NULL);
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gimp_canvas_item_end_change (line);
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}
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