[libchamplain] Ported url-marker demo to python bindings

[Pierre-Luc Beaudoin <plbeaudoin src gnome org>]

commit bcfe35a989439bd0d8813e6d404f3b4c7e898f56
Author: Victor Godoy Poluceno <victorpoluceno gmail com>
Date:   Thu Sep 3 13:26:40 2009 -0300

    Ported url-marker demo to python bindings

 bindings/python/demos/url-marker.py |   97 +++++++++++++++++++++++++++++++++++
 1 files changed, 97 insertions(+), 0 deletions(-)
---
diff --git a/bindings/python/demos/url-marker.py b/bindings/python/demos/url-marker.py
new file mode 100644
index 0000000..d112165
--- /dev/null
+++ b/bindings/python/demos/url-marker.py
@@ -0,0 +1,97 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+import gobject
+import gtk
+import clutter
+import champlain
+
+from twisted.internet import gtk2reactor
+gtk2reactor.install()
+import twisted.web.client as httpclient
+from twisted.internet import reactor 
+
+def texture_new_from_pixbuf(pixbuf):
+    data = pixbuf.get_pixels()
+    width = pixbuf.get_width()
+    height = pixbuf.get_height()
+    has_alpha = pixbuf.get_has_alpha()
+    rowstride = pixbuf.get_rowstride()
+    texture = clutter.Texture()
+    success = texture.set_from_rgb_data(data, has_alpha, width, height, 
+        rowstride, 4 if has_alpha else 3, clutter.TextureFlags(0))
+    if not success:
+        return None
+    return texture
+
+
+def pixbuf_new_from_data(data):
+    loader = gtk.gdk.PixbufLoader()
+    loader.write(data)
+    loader.close()
+    pixbuf = loader.get_pixbuf()
+    return pixbuf
+
+
+def image_download_cb(data, layer, latitude, longitude, url):
+    if not data:
+        return
+    pixbuf = pixbuf_new_from_data(data)
+    if not pixbuf:
+        print "Failed to convert %s into an image" % url
+    # Then transform the pixbuf into a texture
+    texture = texture_new_from_pixbuf(pixbuf)
+    if not texture:
+        print "Failed to convert %s into an texture" % url
+    # Finally create a marker with the texture
+    marker = champlain.marker_new_with_image(texture)
+    marker.set_position(latitude, longitude)
+    layer.add(marker)
+    marker.show_all()
+
+
+def create_marker_from_url(layer, latitude, longitude, url):
+    d = httpclient.getPage(url)
+    d.addCallback(image_download_cb, layer, latitude, longitude, url)
+
+
+def event_cb(stage, event):
+    # use reactor.stop and avoid clutter.main_quit
+    if event.type == clutter.DELETE:
+        reactor.stop()
+        return True
+
+
+def main():
+    gobject.threads_init()
+    clutter.init()
+
+    stage = clutter.Stage(default=True)
+    stage.set_size(800, 600)
+    stage.connect("event", event_cb)  
+
+    # Create the map view
+    view = champlain.View()
+    view.set_size(800, 600)
+    stage.add(view)
+
+    # Create the markers and marker layer
+    layer = champlain.Layer()
+    view.add_layer(layer)
+    create_marker_from_url(layer, 48.218611, 17.146397,
+        "http://hexten.net/cpan-faces/potyl.jpg";)
+    create_marker_from_url(layer, 48.21066, 16.31476,
+        "http://hexten.net/cpan-faces/jkutej.jpg";)
+    create_marker_from_url(layer, 48.14838, 17.10791,
+        "http://bratislava.pm.org/images/whoiswho/jnthn.jpg";)
+
+    # Finish initialising the map view
+    view.set_property('scroll-mode', champlain.SCROLL_MODE_KINETIC)
+    view.set_property('zoom-level', 10)
+    view.center_on(48.22, 16.8)  
+
+    stage.show_all()
+    reactor.run()
+
+
+if __name__ == '__main__':
+    main()