--- /dev/null
+/*
+ * Clutter.
+ *
+ * An OpenGL based 'interactive canvas' library.
+ *
+ * Copyright (C) 2010 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/>.
+ *
+ * Author:
+ * Emmanuele Bassi <ebassi@linux.intel.com>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "clutter-path-constraint.h"
+
+#include "clutter-debug.h"
+#include "clutter-private.h"
+
+#define CLUTTER_PATH_CONSTRAINT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_PATH_CONSTRAINT, ClutterPathConstraintClass))
+#define CLUTTER_IS_PATH_CONSTRAINT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_PATH_CONSTRAINT))
+#define CLUTTER_PATH_CONSTRAINT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_PATH_CONSTRAINT, ClutterPathConstraintClass))
+
+typedef struct _ClutterPathConstraintClass ClutterPathConstraintClass;
+
+struct _ClutterPathConstraint
+{
+ ClutterConstraint parent_instance;
+
+ ClutterPath *path;
+
+ gfloat offset;
+
+ ClutterActor *actor;
+};
+
+struct _ClutterPathConstraintClass
+{
+ ClutterConstraintClass parent_class;
+};
+
+enum
+{
+ PROP_0,
+
+ PROP_PATH,
+ PROP_OFFSET,
+
+ LAST_PROPERTY
+};
+
+G_DEFINE_TYPE (ClutterPathConstraint, clutter_path_constraint, CLUTTER_TYPE_CONSTRAINT);
+
+static GParamSpec *path_properties[LAST_PROPERTY] = { NULL, };
+
+static void
+clutter_path_constraint_update_allocation (ClutterConstraint *constraint,
+ ClutterActor *actor,
+ ClutterActorBox *allocation)
+{
+ ClutterPathConstraint *self = CLUTTER_PATH_CONSTRAINT (constraint);
+ gfloat width, height;
+ ClutterKnot position;
+ guint knot_id;
+
+ if (self->path == NULL)
+ return;
+
+ knot_id = clutter_path_get_position (self->path, self->offset, &position);
+ clutter_actor_box_get_size (allocation, &width, &height);
+ allocation->x1 = position.x;
+ allocation->y1 = position.y;
+ allocation->x2 = allocation->x1 + width;
+ allocation->y2 = allocation->y1 + height;
+}
+
+static void
+clutter_path_constraint_set_actor (ClutterActorMeta *meta,
+ ClutterActor *new_actor)
+{
+ ClutterPathConstraint *path = CLUTTER_PATH_CONSTRAINT (meta);
+ ClutterActorMetaClass *parent;
+
+ /* store the pointer to the actor, for later use */
+ path->actor = new_actor;
+
+ parent = CLUTTER_ACTOR_META_CLASS (clutter_path_constraint_parent_class);
+ parent->set_actor (meta, new_actor);
+}
+
+static void
+clutter_path_constraint_dispose (GObject *gobject)
+{
+ ClutterPathConstraint *self = CLUTTER_PATH_CONSTRAINT (gobject);
+
+ if (self->path != NULL)
+ {
+ g_object_unref (self->path);
+ self->path = NULL;
+ }
+
+ G_OBJECT_CLASS (clutter_path_constraint_parent_class)->dispose (gobject);
+}
+
+static void
+clutter_path_constraint_set_property (GObject *gobject,
+ guint prop_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ ClutterPathConstraint *self = CLUTTER_PATH_CONSTRAINT (gobject);
+
+ switch (prop_id)
+ {
+ case PROP_PATH:
+ clutter_path_constraint_set_path (self, g_value_get_object (value));
+ break;
+
+ case PROP_OFFSET:
+ clutter_path_constraint_set_offset (self, g_value_get_float (value));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
+ }
+}
+
+static void
+clutter_path_constraint_get_property (GObject *gobject,
+ guint prop_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ ClutterPathConstraint *self = CLUTTER_PATH_CONSTRAINT (gobject);
+
+ switch (prop_id)
+ {
+ case PROP_PATH:
+ g_value_set_object (value, self->path);
+ break;
+
+ case PROP_OFFSET:
+ g_value_set_float (value, self->offset);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
+ }
+}
+
+static void
+clutter_path_constraint_class_init (ClutterPathConstraintClass *klass)
+{
+ GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+ ClutterActorMetaClass *meta_class = CLUTTER_ACTOR_META_CLASS (klass);
+ ClutterConstraintClass *constraint_class = CLUTTER_CONSTRAINT_CLASS (klass);
+
+ /**
+ * ClutterPathConstraint:path:
+ *
+ * The #ClutterPath used to constrain the position of an actor.
+ *
+ * Since: 1.6
+ */
+ path_properties[PROP_PATH] =
+ g_param_spec_object ("path",
+ P_("Path"),
+ P_("The path used to constrain an actor"),
+ CLUTTER_TYPE_PATH,
+ CLUTTER_PARAM_READWRITE);
+
+ /**
+ * ClutterPathConstraint:offset:
+ *
+ * The offset along the #ClutterPathConstraint:path, between -1.0 and 2.0.
+ *
+ * Since: 1.6
+ */
+ path_properties[PROP_OFFSET] =
+ g_param_spec_float ("offset",
+ P_("Offset"),
+ P_("The offset along the path, between -1.0 and 2.0"),
+ -1.0, 2.0,
+ 0.0,
+ CLUTTER_PARAM_READWRITE);
+
+ gobject_class->set_property = clutter_path_constraint_set_property;
+ gobject_class->get_property = clutter_path_constraint_get_property;
+ gobject_class->dispose = clutter_path_constraint_dispose;
+ _clutter_object_class_install_properties (gobject_class,
+ LAST_PROPERTY,
+ path_properties);
+
+ meta_class->set_actor = clutter_path_constraint_set_actor;
+
+ constraint_class->update_allocation = clutter_path_constraint_update_allocation;
+}
+
+static void
+clutter_path_constraint_init (ClutterPathConstraint *self)
+{
+ self->offset = 0.0f;
+}
+
+ClutterConstraint *
+clutter_path_constraint_new (ClutterPath *path,
+ gfloat offset)
+{
+ g_return_val_if_fail (path == NULL || CLUTTER_IS_PATH (path), NULL);
+
+ return g_object_new (CLUTTER_TYPE_PATH_CONSTRAINT,
+ "path", path,
+ "offset", offset,
+ NULL);
+}
+
+void
+clutter_path_constraint_set_path (ClutterPathConstraint *constraint,
+ ClutterPath *path)
+{
+ g_return_if_fail (CLUTTER_IS_PATH_CONSTRAINT (constraint));
+ g_return_if_fail (path == NULL || CLUTTER_IS_PATH (path));
+
+ if (constraint->path == path)
+ return;
+
+ if (constraint->path != NULL)
+ {
+ g_object_unref (constraint->path);
+ constraint->path = NULL;
+ }
+
+ if (path != NULL)
+ constraint->path = g_object_ref_sink (path);
+
+ if (constraint->actor != NULL)
+ clutter_actor_queue_relayout (constraint->actor);
+
+ _clutter_notify_by_pspec (G_OBJECT (constraint), path_properties[PROP_PATH]);
+}
+
+ClutterPath *
+clutter_path_constraint_get_path (ClutterPathConstraint *constraint)
+{
+ g_return_val_if_fail (CLUTTER_IS_PATH_CONSTRAINT (constraint), NULL);
+
+ return constraint->path;
+}
+
+void
+clutter_path_constraint_set_offset (ClutterPathConstraint *constraint,
+ gfloat offset)
+{
+ g_return_if_fail (CLUTTER_IS_PATH_CONSTRAINT (constraint));
+
+ if (constraint->offset == offset)
+ return;
+
+ constraint->offset = offset;
+
+ if (constraint->actor != NULL)
+ clutter_actor_queue_relayout (constraint->actor);
+
+ _clutter_notify_by_pspec (G_OBJECT (constraint), path_properties[PROP_OFFSET]);
+}
+
+gfloat
+clutter_path_constraint_get_offset (ClutterPathConstraint *constraint)
+{
+ g_return_val_if_fail (CLUTTER_IS_PATH_CONSTRAINT (constraint), 0.0);
+
+ return constraint->offset;
+}
--- /dev/null
+/*
+ * Clutter.
+ *
+ * An OpenGL based 'interactive canvas' library.
+ *
+ * Copyright (C) 2010 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/>.
+ *
+ * Author:
+ * Emmanuele Bassi <ebassi@linux.intel.com>
+ */
+
+#if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
+#error "Only <clutter/clutter.h> can be included directly."
+#endif
+
+#ifndef __CLUTTER_PATH_CONSTRAINT_H__
+#define __CLUTTER_PATH_CONSTRAINT_H__
+
+#include <clutter/clutter-constraint.h>
+#include <clutter/clutter-path.h>
+
+G_BEGIN_DECLS
+
+#define CLUTTER_TYPE_PATH_CONSTRAINT (clutter_path_constraint_get_type ())
+#define CLUTTER_PATH_CONSTRAINT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_PATH_CONSTRAINT, ClutterPathConstraint))
+#define CLUTTER_IS_PATH_CONSTRAINT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_PATH_CONSTRAINT))
+
+/**
+ * ClutterPathConstraint:
+ *
+ * <structname>ClutterPathConstraint</structname> is an opaque structure
+ * whose members cannot be directly accessed
+ *
+ * Since: 1.4
+ */
+typedef struct _ClutterPathConstraint ClutterPathConstraint;
+
+GType clutter_path_constraint_get_type (void) G_GNUC_CONST;
+
+ClutterConstraint *clutter_path_constraint_new (ClutterPath *path,
+ gfloat offset);
+
+void clutter_path_constraint_set_path (ClutterPathConstraint *constraint,
+ ClutterPath *path);
+ClutterPath * clutter_path_constraint_get_path (ClutterPathConstraint *constraint);
+void clutter_path_constraint_set_offset (ClutterPathConstraint *constraint,
+ gfloat offset);
+gfloat clutter_path_constraint_get_offset (ClutterPathConstraint *constraint);
+
+G_END_DECLS
+
+#endif /* __CLUTTER_PATH_CONSTRAINT_H__ */
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