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-rw-r--r--app/display/gimpcanvaspolygon.c505
1 files changed, 505 insertions, 0 deletions
diff --git a/app/display/gimpcanvaspolygon.c b/app/display/gimpcanvaspolygon.c
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+++ b/app/display/gimpcanvaspolygon.c
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+/* 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 <https://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/gimp-transform-utils.h"
+#include "core/gimpparamspecs.h"
+
+#include "gimpcanvaspolygon.h"
+#include "gimpdisplayshell.h"
+
+
+enum
+{
+ PROP_0,
+ PROP_POINTS,
+ PROP_TRANSFORM,
+ PROP_FILLED
+};
+
+
+typedef struct _GimpCanvasPolygonPrivate GimpCanvasPolygonPrivate;
+
+struct _GimpCanvasPolygonPrivate
+{
+ GimpVector2 *points;
+ gint n_points;
+ GimpMatrix3 *transform;
+ gboolean filled;
+};
+
+#define GET_PRIVATE(polygon) \
+ ((GimpCanvasPolygonPrivate *) gimp_canvas_polygon_get_instance_private ((GimpCanvasPolygon *) (polygon)))
+
+
+/* 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,
+ cairo_t *cr);
+static cairo_region_t * gimp_canvas_polygon_get_extents (GimpCanvasItem *item);
+static gboolean gimp_canvas_polygon_hit (GimpCanvasItem *item,
+ gdouble x,
+ gdouble y);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (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;
+ item_class->hit = gimp_canvas_polygon_hit;
+
+ 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_TRANSFORM,
+ g_param_spec_pointer ("transform", 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));
+}
+
+static void
+gimp_canvas_polygon_init (GimpCanvasPolygon *polygon)
+{
+}
+
+static void
+gimp_canvas_polygon_finalize (GObject *object)
+{
+ GimpCanvasPolygonPrivate *private = GET_PRIVATE (object);
+
+ g_clear_pointer (&private->points, g_free);
+ private->n_points = 0;
+
+ g_clear_pointer (&private->transform, g_free);
+
+ 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:
+ {
+ GimpArray *array = g_value_get_boxed (value);
+
+ g_clear_pointer (&private->points, g_free);
+ private->n_points = 0;
+
+ if (array)
+ {
+ private->points = g_memdup (array->data, array->length);
+ private->n_points = array->length / sizeof (GimpVector2);
+ }
+ }
+ break;
+
+ case PROP_TRANSFORM:
+ {
+ GimpMatrix3 *transform = g_value_get_pointer (value);
+ if (private->transform)
+ g_free (private->transform);
+ if (transform)
+ private->transform = g_memdup (transform, sizeof (GimpMatrix3));
+ else
+ private->transform = NULL;
+ }
+ 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:
+ if (private->points)
+ {
+ GimpArray *array;
+
+ array = gimp_array_new ((const guint8 *) private->points,
+ private->n_points * sizeof (GimpVector2),
+ FALSE);
+ g_value_take_boxed (value, array);
+ }
+ else
+ {
+ g_value_set_boxed (value, NULL);
+ }
+ break;
+
+ case PROP_TRANSFORM:
+ g_value_set_pointer (value, private->transform);
+ 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,
+ GimpVector2 *points,
+ gint *n_points)
+{
+ GimpCanvasPolygonPrivate *private = GET_PRIVATE (item);
+ gint i;
+
+ if (private->transform)
+ {
+ gimp_transform_polygon (private->transform,
+ private->points, private->n_points, FALSE,
+ points, n_points);
+
+ for (i = 0; i < *n_points; i++)
+ {
+ gimp_canvas_item_transform_xy_f (item,
+ points[i].x,
+ points[i].y,
+ &points[i].x,
+ &points[i].y);
+
+ points[i].x = floor (points[i].x) + 0.5;
+ points[i].y = floor (points[i].y) + 0.5;
+ }
+ }
+ else
+ {
+ for (i = 0; i < private->n_points; i++)
+ {
+ gimp_canvas_item_transform_xy_f (item,
+ private->points[i].x,
+ private->points[i].y,
+ &points[i].x,
+ &points[i].y);
+
+ points[i].x = floor (points[i].x) + 0.5;
+ points[i].y = floor (points[i].y) + 0.5;
+ }
+
+ *n_points = private->n_points;
+ }
+}
+
+static void
+gimp_canvas_polygon_draw (GimpCanvasItem *item,
+ cairo_t *cr)
+{
+ GimpCanvasPolygonPrivate *private = GET_PRIVATE (item);
+ GimpVector2 *points;
+ gint n_points;
+ gint i;
+
+ if (! private->points)
+ return;
+
+ n_points = private->n_points;
+
+ if (private->transform)
+ n_points = 3 * n_points / 2;
+
+ points = g_new0 (GimpVector2, n_points);
+
+ gimp_canvas_polygon_transform (item, points, &n_points);
+
+ if (n_points < 2)
+ {
+ g_free (points);
+
+ return;
+ }
+
+ cairo_move_to (cr, points[0].x, points[0].y);
+
+ for (i = 1; i < n_points; i++)
+ {
+ cairo_line_to (cr, points[i].x, points[i].y);
+ }
+
+ if (private->filled)
+ _gimp_canvas_item_fill (item, cr);
+ else
+ _gimp_canvas_item_stroke (item, cr);
+
+ g_free (points);
+}
+
+static cairo_region_t *
+gimp_canvas_polygon_get_extents (GimpCanvasItem *item)
+{
+ GimpCanvasPolygonPrivate *private = GET_PRIVATE (item);
+ cairo_rectangle_int_t rectangle;
+ GimpVector2 *points;
+ gint n_points;
+ gint x1, y1, x2, y2;
+ gint i;
+
+ if (! private->points)
+ return NULL;
+
+ n_points = private->n_points;
+
+ if (private->transform)
+ n_points = 3 * n_points / 2;
+
+ points = g_new0 (GimpVector2, n_points);
+
+ gimp_canvas_polygon_transform (item, points, &n_points);
+
+ if (n_points < 2)
+ {
+ g_free (points);
+
+ return NULL;
+ }
+
+ x1 = floor (points[0].x - 1.5);
+ y1 = floor (points[0].y - 1.5);
+ x2 = x1 + 3;
+ y2 = y1 + 3;
+
+ for (i = 1; i < 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 cairo_region_create_rectangle (&rectangle);
+}
+
+static gboolean
+gimp_canvas_polygon_hit (GimpCanvasItem *item,
+ gdouble x,
+ gdouble y)
+{
+ GimpCanvasPolygonPrivate *private = GET_PRIVATE (item);
+ GimpVector2 *points;
+ gint n_points;
+ gdouble tx, ty;
+ cairo_surface_t *surface;
+ cairo_t *cr;
+ gboolean hit;
+ gint i;
+
+ if (! private->points)
+ return FALSE;
+
+ gimp_canvas_item_transform_xy_f (item, x, y, &tx, &ty);
+
+ n_points = private->n_points;
+
+ if (private->transform)
+ n_points = 3 * n_points / 2;
+
+ points = g_new0 (GimpVector2, n_points);
+
+ gimp_canvas_polygon_transform (item, points, &n_points);
+
+ if (n_points < 2)
+ {
+ g_free (points);
+
+ return FALSE;
+ }
+
+ surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 1, 1);
+ cr = cairo_create (surface);
+ cairo_surface_destroy (surface);
+
+ 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);
+ }
+
+ g_free (points);
+
+ hit = cairo_in_fill (cr, tx, ty);
+
+ cairo_destroy (cr);
+
+ return hit;
+}
+
+GimpCanvasItem *
+gimp_canvas_polygon_new (GimpDisplayShell *shell,
+ const GimpVector2 *points,
+ gint n_points,
+ GimpMatrix3 *transform,
+ gboolean filled)
+{
+ GimpCanvasItem *item;
+ GimpArray *array;
+
+ g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
+ g_return_val_if_fail (points == NULL || n_points > 0, NULL);
+
+ array = gimp_array_new ((const guint8 *) points,
+ n_points * sizeof (GimpVector2), TRUE);
+
+ item = g_object_new (GIMP_TYPE_CANVAS_POLYGON,
+ "shell", shell,
+ "transform", transform,
+ "filled", filled,
+ "points", array,
+ NULL);
+
+ gimp_array_free (array);
+
+ return item;
+}
+
+GimpCanvasItem *
+gimp_canvas_polygon_new_from_coords (GimpDisplayShell *shell,
+ const GimpCoords *coords,
+ gint n_coords,
+ GimpMatrix3 *transform,
+ gboolean filled)
+{
+ GimpCanvasItem *item;
+ GimpVector2 *points;
+ GimpArray *array;
+ gint i;
+
+ g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
+ g_return_val_if_fail (coords == NULL || n_coords > 0, NULL);
+
+ points = g_new (GimpVector2, n_coords);
+
+ for (i = 0; i < n_coords; i++)
+ {
+ points[i].x = coords[i].x;
+ points[i].y = coords[i].y;
+ }
+
+ array = gimp_array_new ((const guint8 *) points,
+ n_coords * sizeof (GimpVector2), TRUE);
+
+ item = g_object_new (GIMP_TYPE_CANVAS_POLYGON,
+ "shell", shell,
+ "transform", transform,
+ "filled", filled,
+ "points", array,
+ NULL);
+
+ gimp_array_free (array);
+ g_free (points);
+
+ return item;
+}
+
+void
+gimp_canvas_polygon_set_points (GimpCanvasItem *polygon,
+ const GimpVector2 *points,
+ gint n_points)
+{
+ GimpArray *array;
+
+ g_return_if_fail (GIMP_IS_CANVAS_POLYGON (polygon));
+ g_return_if_fail (points == NULL || n_points > 0);
+
+ array = gimp_array_new ((const guint8 *) points,
+ n_points * sizeof (GimpVector2), TRUE);
+
+ gimp_canvas_item_begin_change (polygon);
+ g_object_set (polygon,
+ "points", array,
+ NULL);
+ gimp_canvas_item_end_change (polygon);
+
+ gimp_array_free (array);
+}