background color bugfix

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@57716 15284696-431f-4ddb-bdfa-cd5b030d7da7

display/d.northarrow/draw_n_arrow.c

@@ -83,7 +83,7 @@ int draw_n_arrow(double east, double north, double fontsize, char *n_arrow_num)
     line_color->b = (unsigned char)B;
     line_color->a = RGBA_COLOR_OPAQUE;
 
-    if (D_color_number_to_RGB(fg_color, &R, &G, &B) == 0)
+    if (D_color_number_to_RGB(bg_color, &R, &G, &B) == 0)
     	/* fall back to black on failure */
     	G_str_to_color(DEFAULT_FG_COLOR, &R, &G, &B);
     fill_color->r = (unsigned char)R;

display/d.northarrow/main.c

@@ -65,6 +65,7 @@ int main(int argc, char **argv)
 
     bg_color_opt = G_define_standard_option(G_OPT_C_BG);
     bg_color_opt->label = _("Background color");
+    bg_color_opt->answer = _("black");
     bg_color_opt->guisection = _("Colors");
 
     fsize = G_define_option();