mirror of https://github.com/GNOME/gimp.git
app: add a polygon canvas item class (filled polygons unimplemented)
This commit is contained in:
Michael Natterer
parent
f719cf1ea2
commit
4bedffd2cf
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@ -25,6 +25,8 @@ libappdisplay_a_sources = \
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gimpcanvasitem.h \
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gimpcanvasline.c \
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gimpcanvasline.h \
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gimpcanvaspolygon.c \
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gimpcanvaspolygon.h \
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gimpcanvasrectangle.c \
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gimpcanvasrectangle.h \
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gimpcursorview.c \
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@ -0,0 +1,284 @@
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/* 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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* gimpcanvaspolygon.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 "display-types.h"
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#include "core/gimpparamspecs.h"
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#include "gimpcanvaspolygon.h"
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#include "gimpdisplayshell.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_POINTS,
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PROP_FILLED
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};
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typedef struct _GimpCanvasPolygonPrivate GimpCanvasPolygonPrivate;
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struct _GimpCanvasPolygonPrivate
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{
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GimpVector2 *points;
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gint n_points;
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gboolean filled;
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};
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#define GET_PRIVATE(polygon) \
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G_TYPE_INSTANCE_GET_PRIVATE (polygon, \
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GIMP_TYPE_CANVAS_POLYGON, \
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GimpCanvasPolygonPrivate)
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/* local function prototypes */
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static void gimp_canvas_polygon_finalize (GObject *object);
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static void gimp_canvas_polygon_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_polygon_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_polygon_draw (GimpCanvasItem *item,
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GimpDisplayShell *shell,
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cairo_t *cr);
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static GdkRegion * gimp_canvas_polygon_get_extents (GimpCanvasItem *item,
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GimpDisplayShell *shell);
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G_DEFINE_TYPE (GimpCanvasPolygon, gimp_canvas_polygon,
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GIMP_TYPE_CANVAS_ITEM)
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#define parent_class gimp_canvas_polygon_parent_class
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static void
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gimp_canvas_polygon_class_init (GimpCanvasPolygonClass *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_polygon_finalize;
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object_class->set_property = gimp_canvas_polygon_set_property;
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object_class->get_property = gimp_canvas_polygon_get_property;
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item_class->draw = gimp_canvas_polygon_draw;
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item_class->get_extents = gimp_canvas_polygon_get_extents;
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g_object_class_install_property (object_class, PROP_POINTS,
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gimp_param_spec_array ("points", NULL, NULL,
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GIMP_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_FILLED,
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g_param_spec_boolean ("filled", 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 (GimpCanvasPolygonPrivate));
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}
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static void
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gimp_canvas_polygon_init (GimpCanvasPolygon *polygon)
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{
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}
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static void
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gimp_canvas_polygon_finalize (GObject *object)
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{
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GimpCanvasPolygonPrivate *private = GET_PRIVATE (object);
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if (private->points)
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{
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g_free (private->points);
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private->points = NULL;
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private->n_points = 0;
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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_polygon_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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GimpCanvasPolygonPrivate *private = GET_PRIVATE (object);
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switch (property_id)
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{
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case PROP_POINTS:
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break;
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case PROP_FILLED:
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private->filled = 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_polygon_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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GimpCanvasPolygonPrivate *private = GET_PRIVATE (object);
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switch (property_id)
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{
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case PROP_POINTS:
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break;
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case PROP_FILLED:
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g_value_set_boolean (value, private->filled);
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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_polygon_transform (GimpCanvasItem *item,
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GimpDisplayShell *shell,
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GimpVector2 *points)
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{
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GimpCanvasPolygonPrivate *private = GET_PRIVATE (item);
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gint i;
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for (i = 0; i < private->n_points; i++)
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{
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gimp_display_shell_transform_xy_f (shell,
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private->points[i].x,
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private->points[i].y,
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&points[i].x,
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&points[i].y,
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FALSE);
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points[i].x = PROJ_ROUND (points[i].x) + 0.5;
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points[i].y = PROJ_ROUND (points[i].y) + 0.5;
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}
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}
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static void
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gimp_canvas_polygon_draw (GimpCanvasItem *item,
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GimpDisplayShell *shell,
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cairo_t *cr)
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{
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GimpCanvasPolygonPrivate *private = GET_PRIVATE (item);
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GimpVector2 *points;
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gint i;
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points = g_new0 (GimpVector2, private->n_points);
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gimp_canvas_polygon_transform (item, shell, points);
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cairo_move_to (cr, points[0].x, points[0].y);
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for (i = 1; i < private->n_points; i++)
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{
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cairo_line_to (cr, points[i].x, points[i].y);
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}
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if (private->filled)
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_gimp_canvas_item_fill (item, shell, cr);
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else
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_gimp_canvas_item_stroke (item, shell, cr);
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g_free (points);
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}
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static GdkRegion *
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gimp_canvas_polygon_get_extents (GimpCanvasItem *item,
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GimpDisplayShell *shell)
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{
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GimpCanvasPolygonPrivate *private = GET_PRIVATE (item);
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GdkRectangle rectangle;
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GimpVector2 *points;
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gint x1, y1, x2, y2;
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gint i;
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points = g_new0 (GimpVector2, private->n_points);
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gimp_canvas_polygon_transform (item, shell, points);
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x1 = floor (points[0].x - 1.5);
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y1 = floor (points[0].y - 1.5);
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x2 = x1 + 3;
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y2 = y1 + 3;
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for (i = 1; i < private->n_points; i++)
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{
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gint x3 = floor (points[i].x - 1.5);
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gint y3 = floor (points[i].y - 1.5);
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gint x4 = x3 + 3;
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gint y4 = y3 + 3;
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x1 = MIN (x1, x3);
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y1 = MIN (y1, y3);
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x2 = MAX (x2, x4);
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y2 = MAX (y2, y4);
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}
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g_free (points);
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rectangle.x = x1;
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rectangle.y = y1;
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rectangle.width = x2 - x1;
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rectangle.height = y2 - y1;
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return gdk_region_rectangle (&rectangle);
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}
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GimpCanvasItem *
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gimp_canvas_polygon_new (const GimpVector2 *points,
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gint n_points,
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gboolean filled)
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{
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GimpCanvasItem *item;
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GimpCanvasPolygonPrivate *private;
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item = g_object_new (GIMP_TYPE_CANVAS_POLYGON,
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"filled", filled,
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NULL);
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private = GET_PRIVATE (item);
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/* puke */
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private->points = g_memdup (points, n_points * sizeof (GimpVector2));
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private->n_points = n_points;
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return item;
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}
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@ -0,0 +1,57 @@
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/* GIMP - The GNU Image Manipulation Program Copyright (C) 1995
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* Spencer Kimball and Peter Mattis
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*
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* gimpcanvaspolygon.h
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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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#ifndef __GIMP_CANVAS_POLYGON_H__
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#define __GIMP_CANVAS_POLYGON_H__
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#include "gimpcanvasitem.h"
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#define GIMP_TYPE_CANVAS_POLYGON (gimp_canvas_polygon_get_type ())
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#define GIMP_CANVAS_POLYGON(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_CANVAS_POLYGON, GimpCanvasPolygon))
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#define GIMP_CANVAS_POLYGON_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_CANVAS_POLYGON, GimpCanvasPolygonClass))
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#define GIMP_IS_CANVAS_POLYGON(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_CANVAS_POLYGON))
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#define GIMP_IS_CANVAS_POLYGON_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_CANVAS_POLYGON))
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#define GIMP_CANVAS_POLYGON_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_CANVAS_POLYGON, GimpCanvasPolygonClass))
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typedef struct _GimpCanvasPolygon GimpCanvasPolygon;
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typedef struct _GimpCanvasPolygonClass GimpCanvasPolygonClass;
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struct _GimpCanvasPolygon
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{
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GimpCanvasItem parent_instance;
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};
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struct _GimpCanvasPolygonClass
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{
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GimpCanvasItemClass parent_class;
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};
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GType gimp_canvas_polygon_get_type (void) G_GNUC_CONST;
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GimpCanvasItem * gimp_canvas_polygon_new (const GimpVector2 *points,
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gint n_points,
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gboolean filled);
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#endif /* __GIMP_CANVAS_POLYGON_H__ */
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