[libchamplain] Draw error-tiles if no map data is available

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

commit 3bc469087c5de418a7ad3e2473f3ffca5d6dcfab
Author: Simon Wenner <simon wenner ch>
Date:   Thu Jul 16 00:09:06 2009 +0200

    Draw error-tiles if no map data is available

 champlain/champlain-memphis-map-source.c |   45 +++++++++++++++++++++++++++++-
 1 files changed, 44 insertions(+), 1 deletions(-)
---
diff --git a/champlain/champlain-memphis-map-source.c b/champlain/champlain-memphis-map-source.c
index 8d82a44..cee97c0 100644
--- a/champlain/champlain-memphis-map-source.c
+++ b/champlain/champlain-memphis-map-source.c
@@ -182,6 +182,47 @@ map_data_changed_cb (ChamplainMapDataSource *map_data_source,
   champlain_memphis_map_source_delete_session_cache (map_source);
 }
 
+// TODO: share this function with ChamplainNetworkMapSource
+static void
+create_error_tile (ChamplainTile* tile)
+{
+  ClutterActor *actor;
+  cairo_t *cr;
+  cairo_pattern_t *pat;
+  guint size;
+
+  size = champlain_tile_get_size (tile);
+  actor = clutter_cairo_new (size, size);
+  cr = clutter_cairo_create (CLUTTER_CAIRO(actor));
+
+  /* draw a linear gray to white pattern */
+  pat = cairo_pattern_create_linear (size / 2.0, 0.0,  size, size / 2.0);
+  cairo_pattern_add_color_stop_rgb (pat, 0, 0.686, 0.686, 0.686);
+  cairo_pattern_add_color_stop_rgb (pat, 1, 0.925, 0.925, 0.925);
+  cairo_set_source (cr, pat);
+  cairo_rectangle (cr, 0, 0, size, size);
+  cairo_fill (cr);
+
+  cairo_pattern_destroy (pat);
+
+  /* draw the red cross */
+  cairo_set_source_rgb (cr, 0.424, 0.078, 0.078);
+  cairo_set_line_width (cr, 14.0);
+  cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
+  cairo_move_to (cr, 24, 24);
+  cairo_line_to (cr, 50, 50);
+  cairo_move_to (cr, 50, 24);
+  cairo_line_to (cr, 24, 50);
+  cairo_stroke (cr);
+
+  cairo_destroy (cr);
+
+  champlain_tile_set_content (tile, actor, TRUE);
+  clutter_actor_show (actor);
+
+  champlain_tile_set_state (tile, CHAMPLAIN_STATE_DONE);
+}
+
 static void
 fill_tile (ChamplainMapSource *map_source, ChamplainTile *tile)
 {
@@ -215,7 +256,9 @@ fill_tile (ChamplainMapSource *map_source, ChamplainTile *tile)
           champlain_tile_get_x (tile),
           champlain_tile_get_y (tile),
           champlain_tile_get_zoom_level (tile));
-      // TODO: draw an error tile
+
+      create_error_tile (tile);
+      g_object_unref (tile);
     }
   else
     {