Commit 4bedffd2 authored by Michael Natterer's avatar Michael Natterer 😴
Browse files

app: add a polygon canvas item class (filled polygons unimplemented)

parent f719cf1e
......@@ -25,6 +25,8 @@ libappdisplay_a_sources = \
gimpcanvasitem.h \
gimpcanvasline.c \
gimpcanvasline.h \
gimpcanvaspolygon.c \
gimpcanvaspolygon.h \
gimpcanvasrectangle.c \
gimpcanvasrectangle.h \
gimpcursorview.c \
......
/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpcanvaspolygon.c
* Copyright (C) 2010 Michael Natterer <mitch@gimp.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "display-types.h"
#include "core/gimpparamspecs.h"
#include "gimpcanvaspolygon.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-transform.h"
enum
{
PROP_0,
PROP_POINTS,
PROP_FILLED
};
typedef struct _GimpCanvasPolygonPrivate GimpCanvasPolygonPrivate;
struct _GimpCanvasPolygonPrivate
{
GimpVector2 *points;
gint n_points;
gboolean filled;
};
#define GET_PRIVATE(polygon) \
G_TYPE_INSTANCE_GET_PRIVATE (polygon, \
GIMP_TYPE_CANVAS_POLYGON, \
GimpCanvasPolygonPrivate)
/* local function prototypes */
static void gimp_canvas_polygon_finalize (GObject *object);
static void gimp_canvas_polygon_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_canvas_polygon_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_canvas_polygon_draw (GimpCanvasItem *item,
GimpDisplayShell *shell,
cairo_t *cr);
static GdkRegion * gimp_canvas_polygon_get_extents (GimpCanvasItem *item,
GimpDisplayShell *shell);
G_DEFINE_TYPE (GimpCanvasPolygon, gimp_canvas_polygon,
GIMP_TYPE_CANVAS_ITEM)
#define parent_class gimp_canvas_polygon_parent_class
static void
gimp_canvas_polygon_class_init (GimpCanvasPolygonClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
object_class->finalize = gimp_canvas_polygon_finalize;
object_class->set_property = gimp_canvas_polygon_set_property;
object_class->get_property = gimp_canvas_polygon_get_property;
item_class->draw = gimp_canvas_polygon_draw;
item_class->get_extents = gimp_canvas_polygon_get_extents;
g_object_class_install_property (object_class, PROP_POINTS,
gimp_param_spec_array ("points", NULL, NULL,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_FILLED,
g_param_spec_boolean ("filled", NULL, NULL,
FALSE,
GIMP_PARAM_READWRITE));
g_type_class_add_private (klass, sizeof (GimpCanvasPolygonPrivate));
}
static void
gimp_canvas_polygon_init (GimpCanvasPolygon *polygon)
{
}
static void
gimp_canvas_polygon_finalize (GObject *object)
{
GimpCanvasPolygonPrivate *private = GET_PRIVATE (object);
if (private->points)
{
g_free (private->points);
private->points = NULL;
private->n_points = 0;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_canvas_polygon_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpCanvasPolygonPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_POINTS:
break;
case PROP_FILLED:
private->filled = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_canvas_polygon_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpCanvasPolygonPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_POINTS:
break;
case PROP_FILLED:
g_value_set_boolean (value, private->filled);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_canvas_polygon_transform (GimpCanvasItem *item,
GimpDisplayShell *shell,
GimpVector2 *points)
{
GimpCanvasPolygonPrivate *private = GET_PRIVATE (item);
gint i;
for (i = 0; i < private->n_points; i++)
{
gimp_display_shell_transform_xy_f (shell,
private->points[i].x,
private->points[i].y,
&points[i].x,
&points[i].y,
FALSE);
points[i].x = PROJ_ROUND (points[i].x) + 0.5;
points[i].y = PROJ_ROUND (points[i].y) + 0.5;
}
}
static void
gimp_canvas_polygon_draw (GimpCanvasItem *item,
GimpDisplayShell *shell,
cairo_t *cr)
{
GimpCanvasPolygonPrivate *private = GET_PRIVATE (item);
GimpVector2 *points;
gint i;
points = g_new0 (GimpVector2, private->n_points);
gimp_canvas_polygon_transform (item, shell, points);
cairo_move_to (cr, points[0].x, points[0].y);
for (i = 1; i < private->n_points; i++)
{
cairo_line_to (cr, points[i].x, points[i].y);
}
if (private->filled)
_gimp_canvas_item_fill (item, shell, cr);
else
_gimp_canvas_item_stroke (item, shell, cr);
g_free (points);
}
static GdkRegion *
gimp_canvas_polygon_get_extents (GimpCanvasItem *item,
GimpDisplayShell *shell)
{
GimpCanvasPolygonPrivate *private = GET_PRIVATE (item);
GdkRectangle rectangle;
GimpVector2 *points;
gint x1, y1, x2, y2;
gint i;
points = g_new0 (GimpVector2, private->n_points);
gimp_canvas_polygon_transform (item, shell, points);
x1 = floor (points[0].x - 1.5);
y1 = floor (points[0].y - 1.5);
x2 = x1 + 3;
y2 = y1 + 3;
for (i = 1; i < private->n_points; i++)
{
gint x3 = floor (points[i].x - 1.5);
gint y3 = floor (points[i].y - 1.5);
gint x4 = x3 + 3;
gint y4 = y3 + 3;
x1 = MIN (x1, x3);
y1 = MIN (y1, y3);
x2 = MAX (x2, x4);
y2 = MAX (y2, y4);
}
g_free (points);
rectangle.x = x1;
rectangle.y = y1;
rectangle.width = x2 - x1;
rectangle.height = y2 - y1;
return gdk_region_rectangle (&rectangle);
}
GimpCanvasItem *
gimp_canvas_polygon_new (const GimpVector2 *points,
gint n_points,
gboolean filled)
{
GimpCanvasItem *item;
GimpCanvasPolygonPrivate *private;
item = g_object_new (GIMP_TYPE_CANVAS_POLYGON,
"filled", filled,
NULL);
private = GET_PRIVATE (item);
/* puke */
private->points = g_memdup (points, n_points * sizeof (GimpVector2));
private->n_points = n_points;
return item;
}
/* GIMP - The GNU Image Manipulation Program Copyright (C) 1995
* Spencer Kimball and Peter Mattis
*
* gimpcanvaspolygon.h
* Copyright (C) 2010 Michael Natterer <mitch@gimp.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __GIMP_CANVAS_POLYGON_H__
#define __GIMP_CANVAS_POLYGON_H__
#include "gimpcanvasitem.h"
#define GIMP_TYPE_CANVAS_POLYGON (gimp_canvas_polygon_get_type ())
#define GIMP_CANVAS_POLYGON(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_CANVAS_POLYGON, GimpCanvasPolygon))
#define GIMP_CANVAS_POLYGON_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_CANVAS_POLYGON, GimpCanvasPolygonClass))
#define GIMP_IS_CANVAS_POLYGON(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_CANVAS_POLYGON))
#define GIMP_IS_CANVAS_POLYGON_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_CANVAS_POLYGON))
#define GIMP_CANVAS_POLYGON_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_CANVAS_POLYGON, GimpCanvasPolygonClass))
typedef struct _GimpCanvasPolygon GimpCanvasPolygon;
typedef struct _GimpCanvasPolygonClass GimpCanvasPolygonClass;
struct _GimpCanvasPolygon
{
GimpCanvasItem parent_instance;
};
struct _GimpCanvasPolygonClass
{
GimpCanvasItemClass parent_class;
};
GType gimp_canvas_polygon_get_type (void) G_GNUC_CONST;
GimpCanvasItem * gimp_canvas_polygon_new (const GimpVector2 *points,
gint n_points,
gboolean filled);
#endif /* __GIMP_CANVAS_POLYGON_H__ */
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