Hi all,
I wanto to create an object ClutterGrid, extending the ClutterActor main
class, but I have a problem.
I have followed this tutorial:
http://www.openismus.com/misc/clutter_tutorial/docs/tutorial/html/apa.html
The object is the same but I've a property in addition to the "color" in
example; this is the struct of private object:
struct _ClutterGridPrivate
{
ClutterColor color;
gint step;
};
I've modified the functions "clutter_grid_set_property" and
"clutter_grid_get_property", to manage the PROP_STEP enumeration,
and I don't receive any compilation problem....
.... but ....
When I try to executing the test program I receive this errors:
(./grid_actor_test:32623): GLib-GObject-CRITICAL **: g_param_spec_boxed:
assertion `G_TYPE_IS_VALUE_TYPE (boxed_type)' failed
(./grid_actor_test:32623): GLib-GObject-CRITICAL **:
g_object_class_install_property: assertion `G_IS_PARAM_SPEC (pspec)' failed
As attachment I've put the grid_actor.c file.
I think the error stay into the "clutter_grid_class_init" function.
Where I've wrong?
Sorry for my english and thanks for help!
Ciao
--
Matteo Cappadonna
[EMAIL PROTECTED]
/* grid_actor.c - Clutter actor for grid
*
* (c) Matteo <mouser> Cappadonna, 2008
* [EMAIL PROTECTED]
*/
#include "grid_actor.h"
#include <clutter/cogl.h>
#include <GL/glx.h>
G_DEFINE_TYPE (ClutterGrid, clutter_grid, CLUTTER_TYPE_ACTOR);
enum
{
PROP_0,
PROP_COLOR,
PROP_STEP
};
#define CLUTTER_GRID_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
CLUTTER_TYPE_GRID, ClutterGridPrivate))
struct _ClutterGridPrivate
{
ClutterColor color;
gint step;
};
static void
clutter_grid_paint (ClutterActor *self)
{
ClutterGrid *grid = CLUTTER_GRID(self);
ClutterGridPrivate *priv;
ClutterGeometry geom;
ClutterColor tmp_col;
gint x, y;
grid = CLUTTER_GRID(self);
priv = grid->priv;
cogl_push_matrix();
cogl_enable(CGL_ENABLE_BLEND);
clutter_actor_get_geometry (self, &geom);
/* parent paint call will have translated us into position so
* paint from 0, 0
*/
tmp_col.red = priv->color.red;
tmp_col.green = priv->color.green;
tmp_col.blue = priv->color.blue;
tmp_col.alpha = clutter_actor_get_opacity(self);
/* paint the grid
*/
glBegin(GL_LINES);
/* paint vertical lines
*/
for (x=priv->step; x<geom.width; x+=priv->step)
{
glVertex2i(x, 0);
glVertex2i(x, geom.height);
}
/* paint horizontal lines
*/
for (y=priv->step; y<geom.height; y+=priv->step)
{
glVertex2i(0, y);
glVertex2i(geom.width, y);
}
glEnd();
cogl_pop_matrix();
}
static void
clutter_grid_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterGrid *grid = CLUTTER_GRID(object);
switch (prop_id)
{
case PROP_COLOR:
clutter_grid_set_color(grid, g_value_get_boxed(value));
break;
case PROP_STEP:
clutter_grid_set_step(grid, g_value_get_boxed(value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
break;
}
}
static void
clutter_grid_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterGrid *grid = CLUTTER_GRID(object);
ClutterColor color;
switch (prop_id)
{
case PROP_COLOR:
clutter_grid_get_color(grid, &color);
g_value_set_boxed(value, &color);
break;
case PROP_STEP:
g_value_set_boxed(value, &CLUTTER_GRID_GET_PRIVATE(object)->step);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
clutter_grid_finalize (GObject *object)
{
G_OBJECT_CLASS(clutter_grid_parent_class)->finalize(object);
}
static void
clutter_grid_dispose (GObject *object)
{
G_OBJECT_CLASS(clutter_grid_parent_class)->dispose(object);
}
static void
clutter_grid_class_init (ClutterGridClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS(klass);
actor_class->paint = clutter_grid_paint;
gobject_class->finalize = clutter_grid_finalize;
gobject_class->dispose = clutter_grid_dispose;
gobject_class->set_property = clutter_grid_set_property;
gobject_class->get_property = clutter_grid_get_property;
/**
* ClutterGrid:color:
*
* The color of the grid.
*/
g_object_class_install_property(gobject_class,
PROP_COLOR,
g_param_spec_boxed("color",
"Color",
"The color of the grid",
CLUTTER_TYPE_COLOR,
G_PARAM_READABLE | G_PARAM_WRITABLE));
/**
* ClutterGrid:step:
*
* The step of the grid lines.
*/
g_object_class_install_property(gobject_class,
PROP_STEP,
g_param_spec_boxed("step",
"Step",
"The step of the grid lines.",
G_TYPE_BOXED,
G_PARAM_READABLE | G_PARAM_WRITABLE));
g_type_class_add_private(gobject_class, sizeof(ClutterGridPrivate));
}
static void
clutter_grid_init (ClutterGrid *self)
{
ClutterGridPrivate *priv;
self->priv = priv = CLUTTER_GRID_GET_PRIVATE(self);
priv->color.red = 0xff;
priv->color.green = 0xff;
priv->color.blue = 0xff;
priv->color.alpha = 0xff;
}
/**
* clutter_grid_new:
*
* Create a new #ClutterActor with a grid shape.
*
* Return value: a new #ClutterActor
*/
ClutterActor*
clutter_grid_new (void)
{
return g_object_new(CLUTTER_TYPE_GRID, NULL);
}
/**
* clutter_grid_new_with_color:
* @color: a #ClutterColor
*
* Creates a new #ClutterActor with a grid shape
* and with @color.
*
* Return value: a new #ClutterActor
*/
ClutterActor*
clutter_grid_new_with_color (const ClutterColor *color)
{
return g_object_new(CLUTTER_TYPE_GRID,
"color", color,
NULL);
}
/**
* clutter_grid_get_color:
* @grid: a #ClutterGrid
* @color: return location for a #ClutterColor
*
* Retrieves the color of a @grid.
*/
void
clutter_grid_get_color (ClutterGrid *grid,
ClutterColor *color)
{
ClutterGridPrivate *priv;
g_return_if_fail(CLUTTER_IS_GRID(grid));
g_return_if_fail(color != NULL);
priv = grid->priv;
color->red = priv->color.red;
color->green = priv->color.green;
color->blue = priv->color.blue;
color->alpha = priv->color.alpha;
}
/**
* clutter_grid_set_color:
* @grid: a #ClutterGrid
* @color: a #ClutterColor
*
* Sets the color of @grid
*/
void
clutter_grid_set_color (ClutterGrid *grid,
const ClutterColor *color)
{
ClutterGridPrivate *priv;
g_return_if_fail(CLUTTER_IS_GRID(grid));
g_return_if_fail(color != NULL);
g_object_ref(grid);
priv = grid->priv;
priv->color.red = color->red;
priv->color.green = color->green;
priv->color.blue = color->blue;
priv->color.alpha = color->alpha;
clutter_actor_set_opacity(CLUTTER_ACTOR(grid), priv->color.alpha);
if (CLUTTER_ACTOR_IS_VISIBLE(CLUTTER_ACTOR(grid)))
clutter_actor_queue_redraw(CLUTTER_ACTOR(grid));
g_object_notify(G_OBJECT(grid), "color");
g_object_unref(grid);
}
/**
* clutter_grid_get_step:
* @grid: a #ClutterGrid
* @step: return location for a #gint
*
* Retrieves the step of @grid lines.
*/
void
clutter_grid_get_step (ClutterGrid *grid,
gint *step)
{
ClutterGridPrivate *priv;
g_return_if_fail(CLUTTER_IS_GRID(grid));
g_return_if_fail(step != NULL);
priv = grid->priv;
step = &priv->step;
}
/**
* clutter_grid_set_color:
* @grid: a #ClutterGrid
* @step: a @gint
*
* Sets the step of @grid lines
*/
void
clutter_grid_set_step (ClutterGrid *grid,
const gint *step)
{
ClutterGridPrivate *priv;
g_return_if_fail(CLUTTER_IS_GRID(grid));
g_return_if_fail(grid != NULL);
g_object_ref(grid);
priv = grid->priv;
priv->step = *step;
if (CLUTTER_ACTOR_IS_VISIBLE(CLUTTER_ACTOR(grid)))
clutter_actor_queue_redraw(CLUTTER_ACTOR(grid));
g_object_notify(G_OBJECT(grid), "step");
g_object_unref(grid);
}
