[gnome-chess] 2D: fix board numbering when Black is on bottom

[Michael Catanzaro <mcatanzaro src gnome org>]

commit fb6393114d4c343bc54db480937f38c01734b017
Author: Michael Catanzaro <mike catanzaro gmail com>
Date:   Sun Jul 14 22:35:38 2013 -0500

    2D: fix board numbering when Black is on bottom
    
    https://bugzilla.gnome.org/show_bug.cgi?id=703837

 src/chess-view-2d.vala |   26 +++++++++++++++++++++++---
 1 files changed, 23 insertions(+), 3 deletions(-)
---
diff --git a/src/chess-view-2d.vala b/src/chess-view-2d.vala
index 6bb7d7d..b0daa23 100644
--- a/src/chess-view-2d.vala
+++ b/src/chess-view-2d.vala
@@ -124,9 +124,6 @@ private class ChessView2D : ChessView
 
         if (scene.show_numbering)
         {
-            string[] files = { "a", "b", "c", "d", "e", "f", "g", "h" };
-            string[] ranks = { "8", "7", "6", "5", "4", "3", "2", "1" };
-
             /* Files are centered individiual glyph width and combined glyph height,
              * ranks are centered on individual glyph widths and heights */
 
@@ -143,6 +140,27 @@ private class ChessView2D : ChessView
             double file_offset = -(square_size * 3.5);
             double rank_offset = -(square_size * 3.5);
 
+            string[] files;
+            string[] ranks;
+
+            Cairo.Matrix matrix = c.get_matrix ();
+
+            if (scene.board_angle == 180.0)
+            {
+                files = { "h", "g", "f", "e", "d", "c", "b", "a" };
+                ranks = { "1", "2", "3", "4", "5", "6", "7", "8" };
+
+                matrix.scale (-1, -1);
+            }
+            else
+            {
+                files = { "a", "b", "c", "d", "e", "f", "g", "h" };
+                ranks = { "8", "7", "6", "5", "4", "3", "2", "1" };
+            }
+
+            c.save ();
+            c.set_matrix (matrix);
+
             for (int i = 0; i < 8; i++)
             {
                 c.text_extents (ranks[i], out extents);
@@ -177,6 +195,8 @@ private class ChessView2D : ChessView
                 file_offset += square_size;
                 rank_offset += square_size;
             }
+
+            c.restore ();
         }
 
         /* Draw the pieces */