pygnomecanvas のバグ?

gnomecanvas.path_def_new() で CanvasPathDef オブジェクトを作っても、closepath() メソッドが提供されてないのでパスを閉じることができない模様。

import gtk
import gnomecanvas

canvas = gnomecanvas.Canvas( aa = True )
bpath = gnomecanvas.path_def_new( [
        ( gnomecanvas.MOVETO, 30, 0 ),
        ( gnomecanvas.LINETO, 40, 0 ),
        ( gnomecanvas.CURVETO, 70, 0, 70, 30, 40, 30 ),
        ( gnomecanvas.LINETO, 30, 30 ),
        ( gnomecanvas.CURVETO, 0, 30, 0, 0, 30, 0 )
        ] )
canvas.root().add(
    gnomecanvas.CanvasBpath,
    bpath = bpath,
    fill_color = 'red', outline_color = 'black',
    width_units = 1.0)

canvas.set_size_request(320, 240)
canvas.set_scroll_region(0, 0, 320, 240)

wnd = gtk.Window(gtk.WINDOW_TOPLEVEL)
wnd.connect("destroy", lambda widget: gtk.main_quit())
wnd.add(canvas)

wnd.show_all()

gtk.main()

ちなみに

Python 2.5.1 (r251:54863, May  2 2007, 16:56:35) 
[GCC 4.1.2 (Ubuntu 4.1.2-0ubuntu4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import gnomecanvas
>>> print dir(gnomecanvas.path_def_new([]))
['__class__', '__cmp__', '__delattr__', '__doc__', '__getattribute__',
'__gtype__', '__hash__', '__init__', '__new__', '__reduce__', '__reduce_ex__',
'__repr__', '__setattr__', '__str__', 'copy']

Cで書いた場合:

#include <gtk/gtk.h>
#include <libgnomecanvas/gnome-canvas.h>
#include <libgnomecanvas/gnome-canvas-path-def.h>


void on_destroy(GtkWindow *wnd)
{
    gtk_main_quit();
}

int main(int argc, char **argv)
{
    GtkWindow *wnd;

    gtk_init(&argc, &argv);

    wnd = GTK_WINDOW(gtk_window_new(GTK_WINDOW_TOPLEVEL));
    g_signal_connect_closure(G_OBJECT(wnd), "destroy", 
        g_cclosure_new((GCallback)on_destroy, NULL, NULL), FALSE);

    {
        GnomeCanvas *canvas = GNOME_CANVAS(gnome_canvas_new_aa());

        gtk_widget_set_size_request(GTK_WIDGET(canvas), 320, 240);
        gnome_canvas_set_scroll_region(canvas, 0, 0, 320, 240);
        GnomeCanvasGroup *root = gnome_canvas_root(canvas);
        {
            GnomeCanvasPathDef *bpath = gnome_canvas_path_def_new();

            gnome_canvas_path_def_moveto(bpath, 30, 0);
            gnome_canvas_path_def_lineto(bpath, 40, 0);
            gnome_canvas_path_def_curveto(bpath, 70, 0, 70, 30, 40, 30);
            gnome_canvas_path_def_lineto(bpath, 30, 30);
            gnome_canvas_path_def_curveto(bpath, 0, 30, 0, 0, 30, 0);
            gnome_canvas_path_def_closepath(bpath); /* ここがポイント */

            gnome_canvas_item_new(root, gnome_canvas_bpath_get_type(),
                "bpath", bpath,
                "outline-color", "black",
                "fill-color", "red",
                "width-units", (gdouble)1.0,
                NULL);
        }
        gtk_container_add(GTK_CONTAINER(wnd), GTK_WIDGET(canvas));
    }

    gtk_widget_show_all(GTK_WIDGET(wnd));
    gtk_main();

    return 0;
}

gnome-python	Cで書いた場合

gnomecanvasって消えちゃうのか存続するのか微妙なので手が出しにくい。うーん。

追記: パッチというのもおこがましいくらいのものを書いて送ってみた: GNOME Bug #494500