bool canvas_t::set_background(const std::string &filename)
{
canvas_goocanvas *gcanvas = static_cast<canvas_goocanvas *>(this);
GooCanvasItem *gr = gcanvas->group[CANVAS_GROUP_BG];
int n = goo_canvas_item_get_n_children(gr);
if(n > 0) {
assert_cmpnum(n, 1);
goo_canvas_item_remove_child(gr, 0);
}
if(filename.empty())
return false;
gcanvas->bg.pix.reset(gdk_pixbuf_new_from_file(filename.c_str(), nullptr));
if(!gcanvas->bg.pix)
return false;
float width = gdk_pixbuf_get_width(gcanvas->bg.pix.get());
float height = gdk_pixbuf_get_height(gcanvas->bg.pix.get());
/* calculate required scale factor */
gcanvas->bg.scale.x = (gcanvas->bounds.max.x - gcanvas->bounds.min.x) / width;
gcanvas->bg.scale.y = (gcanvas->bounds.max.y - gcanvas->bounds.min.y) / height;
GooCanvasItem *bg = goo_canvas_image_new(gr, gcanvas->bg.pix.get(),
gcanvas->bounds.min.x / gcanvas->bg.scale.x - width / 2.0f,
gcanvas->bounds.min.y / gcanvas->bg.scale.y - height / 2.0f,
nullptr);
goo_canvas_item_scale(bg, gcanvas->bg.scale.x, gcanvas->bg.scale.y);
return true;
}
static gint
goo_canvas_item_accessible_get_n_children (AtkObject *accessible)
{
GooCanvasItem *item;
GObject *object;
g_return_val_if_fail (GOO_IS_CANVAS_ITEM_ACCESSIBLE (accessible), 0);
object = atk_gobject_accessible_get_object (ATK_GOBJECT_ACCESSIBLE (accessible));
if (object == NULL)
return 0;
item = GOO_CANVAS_ITEM (object);
return goo_canvas_item_get_n_children (item);
}
/*
* This does the moves of the game items on the play canvas
*
*/
static gint planegame_move_items (GtkWidget *widget, gpointer data)
{
int i;
/* Check collision with each cloud */
for(i = 0;
i < goo_canvas_item_get_n_children(clouds_rootitem);
i++)
planegame_cloud_colision(goo_canvas_item_get_child(clouds_rootitem,
i));
/* move the plane */
planegame_move_plane(planeitem);
planemove_id = g_timeout_add (speed,
(GtkFunction) planegame_move_items, NULL);
return(FALSE);
}
