+static void
+tile_paint (cairo_t *cr, void *closure)
+{
+ tile_t *tile = closure;
+
+ cairo_pattern_t *gradient;
+ cairo_text_extents_t extents;
+ int rad = (int) (tile->size / 2);
+ int cx = tile->size / 2;
+ int cy = cx;
+ int tx, ty;
+ double spot_angle = M_PI / 4.0;
+ double spot_rad = rad / 2.0;
+ char string[2];
+
+ cairo_save (cr);
+
+ gradient = cairo_pattern_create_radial (cx - spot_rad * cos (spot_angle),
+ cy - spot_rad * sin (spot_angle),
+ 0.0,
+ cx - spot_rad * cos (spot_angle),
+ cy - spot_rad * sin (spot_angle),
+ rad + spot_rad);
+ cairo_pattern_add_color_stop_rgb (gradient, 0.0, 1.0, 1.0, 1.0);
+ cairo_pattern_add_color_stop_rgb (gradient, 1.0, 0.33, 0.33, 0.33);
+
+ cairo_set_source (cr, gradient);
+
+ cairo_arc (cr,
+ cx, cy,
+ rad, 0, 2 * M_PI);
+
+ cairo_fill (cr);
+
+ cairo_select_font_face (cr, "mono",
+ CAIRO_FONT_SLANT_NORMAL,
+ CAIRO_FONT_WEIGHT_BOLD);
+ cairo_set_font_size (cr, 1.8 * rad);
+
+ string[0] = tile->letter;
+ string[1] = '\0';
+ cairo_text_extents (cr, string, &extents);
+ tx = cx - extents.width / 2 - extents.x_bearing;
+ ty = cy - extents.height / 2 - extents.y_bearing;
+
+ cairo_set_source_rgb (cr, 0.7, 0.7, 0.7);
+ cairo_move_to (cr, tx + 1, ty + 1);
+ cairo_show_text (cr, string);
+
+ cairo_set_source_rgb (cr, 0.33, 0.33, 0.33);
+ cairo_move_to (cr, tx - 1, ty - 1);
+ cairo_show_text (cr, string);
+
+ cairo_set_source_rgb (cr, 0.2, 0.3, 0.8);
+ cairo_move_to (cr, tx, ty);
+ cairo_show_text (cr, string);
+
+ cairo_restore (cr);
+}
+
+static void
+tile_move_to (tile_t *tile, int x, int y)
+{
+ cairo_matrix_t matrix;
+
+ cairo_matrix_init_translate (&matrix, x, y);
+ goo_canvas_item_set_transform (tile->item, &matrix);
+}
+
+static void
+tile_glide_to (tile_t *tile, int x, int y)
+{
+ goo_canvas_item_animate (tile->item, x, y,
+ 1.0, 0,
+ 500, 40,
+ GOO_CANVAS_ANIMATE_FREEZE);
+ tile->x = x;
+ tile->y = y;
+}
+