mutter/clutter/clutter-path.h

/*
 * Clutter.
 *
 * An OpenGL based 'interactive canvas' library.
 *
 * Authored By Matthew Allum  <mallum@openedhand.com>
 *
 * Copyright (C) 2008 Intel Corporation
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
 */

#if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
#error "Only <clutter/clutter.h> can be included directly."
#endif

#ifndef __CLUTTER_PATH_H__
#define __CLUTTER_PATH_H__

#include <glib-object.h>
#include <clutter/clutter-types.h>

G_BEGIN_DECLS

#define CLUTTER_TYPE_PATH                                               \
  (clutter_path_get_type())
#define CLUTTER_PATH(obj)                                               \
  (G_TYPE_CHECK_INSTANCE_CAST ((obj),                                   \
                               CLUTTER_TYPE_PATH,                       \
                               ClutterPath))
#define CLUTTER_PATH_CLASS(klass)                                       \
  (G_TYPE_CHECK_CLASS_CAST ((klass),                                    \
                            CLUTTER_TYPE_PATH,                          \
                            ClutterPathClass))
#define CLUTTER_IS_PATH(obj)                                            \
  (G_TYPE_CHECK_INSTANCE_TYPE ((obj),                                   \
                               CLUTTER_TYPE_PATH))
#define CLUTTER_IS_PATH_CLASS(klass)                                    \
  (G_TYPE_CHECK_CLASS_TYPE ((klass),                                    \
                            CLUTTER_TYPE_PATH))
#define CLUTTER_PATH_GET_CLASS(obj)                                     \
  (G_TYPE_INSTANCE_GET_CLASS ((obj),                                    \
                              CLUTTER_TYPE_PATH,                        \
                              ClutterPathClass))

#define CLUTTER_TYPE_PATH_NODE (clutter_path_node_get_type ())

#define CLUTTER_PATH_RELATIVE 32

/**
 * ClutterPathNodeType:
 * @CLUTTER_PATH_MOVE_TO: jump to the given position
 * @CLUTTER_PATH_LINE_TO: create a line from the last node to the
 * given position
 * @CLUTTER_PATH_CURVE_TO: bezier curve using the last position and
 * three control points.
 * @CLUTTER_PATH_CLOSE: create a line from the last node to the last
 * %CLUTTER_PATH_MOVE_TO node.
 * @CLUTTER_PATH_REL_MOVE_TO: same as %CLUTTER_PATH_MOVE_TO but with
 * coordinates relative to the last node.
 * @CLUTTER_PATH_REL_LINE_TO: same as %CLUTTER_PATH_LINE_TO but with
 * coordinates relative to the last node.
 * @CLUTTER_PATH_REL_CURVE_TO: same as %CLUTTER_PATH_CURVE_TO but with
 * coordinates relative to the last node.
 */
typedef enum {
  CLUTTER_PATH_MOVE_TO      = 0,
  CLUTTER_PATH_LINE_TO      = 1,
  CLUTTER_PATH_CURVE_TO     = 2,
  CLUTTER_PATH_CLOSE        = 3,

  CLUTTER_PATH_REL_MOVE_TO  = CLUTTER_PATH_MOVE_TO | CLUTTER_PATH_RELATIVE,
  CLUTTER_PATH_REL_LINE_TO  = CLUTTER_PATH_LINE_TO | CLUTTER_PATH_RELATIVE,
  CLUTTER_PATH_REL_CURVE_TO = CLUTTER_PATH_CURVE_TO | CLUTTER_PATH_RELATIVE
} ClutterPathNodeType;

typedef struct _ClutterPath        ClutterPath;
typedef struct _ClutterPathClass   ClutterPathClass;
typedef struct _ClutterPathPrivate ClutterPathPrivate;
typedef struct _ClutterPathNode    ClutterPathNode;

/**
 * ClutterPathCallback:
 * @node: the node
 * @data: optional data passed to the function
 *
 * This function is passed to clutter_path_foreach() and will be
 * called for each node contained in the path.
 *
 * Since: 1.0
 */
typedef void (* ClutterPathCallback) (const ClutterPathNode *node,
                                      gpointer data);

/**
 * ClutterPathClass:
 *
 * The #ClutterPathClass struct contains only private data.
 */
struct _ClutterPathClass
{
  /*< private >*/
  GInitiallyUnownedClass parent_class;
};

/**
 * ClutterPath:
 *
 * The #ClutterPath struct contains only private data and should
 * be accessed with the functions below.
 */
struct _ClutterPath
{
  /*< private >*/
  GInitiallyUnowned parent;

  ClutterPathPrivate *priv;
};

/**
 * ClutterPathNode:
 * @type: the node's type
 * @points: the coordinates of the node
 *
 * Represents a single node of a #ClutterPath.
 *
 * Some of the coordinates in @points may be unused for some node
 * types. %CLUTTER_PATH_MOVE_TO and %CLUTTER_PATH_LINE_TO use only two
 * pairs of coordinates, %CLUTTER_PATH_CURVE_TO uses all three and
 * %CLUTTER_PATH_CLOSE uses none.
 *
 * Since: 1.0
 */
struct _ClutterPathNode
{
  ClutterPathNodeType type;

  ClutterKnot points[3];
};

GType clutter_path_get_type (void) G_GNUC_CONST;

ClutterPath *clutter_path_new (void);

ClutterPath *clutter_path_new_with_description (const gchar *desc);

void clutter_path_add_move_to (ClutterPath *path,
                               gint x,
                               gint y);

void clutter_path_add_rel_move_to (ClutterPath *path,
                                   gint x,
                                   gint y);

void clutter_path_add_line_to (ClutterPath *path,
                               gint x,
                               gint y);

void clutter_path_add_rel_line_to (ClutterPath *path,
                                   gint x,
                                   gint y);

void clutter_path_add_curve_to (ClutterPath *path,
                                gint x1,
                                gint y1,
                                gint x2,
                                gint y2,
                                gint x3,
                                gint y3);

void clutter_path_add_rel_curve_to (ClutterPath *path,
                                    gint x1,
                                    gint y1,
                                    gint x2,
                                    gint y2,
                                    gint x3,
                                    gint y3);

void clutter_path_add_close (ClutterPath *path);

gboolean clutter_path_add_string (ClutterPath *path,
                                  const gchar *str);

void clutter_path_add_node (ClutterPath *path,
                            const ClutterPathNode *node);

guint clutter_path_get_n_nodes (ClutterPath *path);

void clutter_path_get_node (ClutterPath *path,
                            guint index,
                            ClutterPathNode *node);

GSList *clutter_path_get_nodes (ClutterPath *path);

void clutter_path_foreach (ClutterPath *path,
                           ClutterPathCallback callback,
                           gpointer user_data);

void clutter_path_insert_node (ClutterPath *path,
                               gint index,
                               const ClutterPathNode *node);

void clutter_path_remove_node (ClutterPath *path,
                               guint index);

void clutter_path_replace_node (ClutterPath *path,
                                guint index,
                                const ClutterPathNode *node);

gchar *clutter_path_get_description (ClutterPath *path);

gboolean clutter_path_set_description (ClutterPath *path,
                                       const gchar *str);

void clutter_path_clear (ClutterPath *path);

guint clutter_path_get_position (ClutterPath *path,
                                 guint alpha,
                                 ClutterKnot *position);

guint clutter_path_get_length (ClutterPath *path);

ClutterPathNode *clutter_path_node_copy (const ClutterPathNode *node);

void clutter_path_node_free (ClutterPathNode *node);

gboolean clutter_path_node_equal (const ClutterPathNode *node_a,
                                  const ClutterPathNode *node_b);

GType clutter_path_node_get_type (void);

G_END_DECLS

#endif /* __CLUTTER_PATH_H__ */