git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@480 c06c8d41-db1a-0410-9941-cceddc491573
6GJYM7D3VKAKCIHAOEZW5XPE7KIJZXJCYZYMHVJAECV5QZWGQAUAC
const int ex = gx - you.x_pos + 9;
const int ey = gy - you.y_pos + 9;
int object = env.show[ex][ey];
unsigned short colour = env.show_col[ex][ey];
unsigned short ch;
get_symbol( object, &ch, &colour );
set_envmap_char( gx, gy, ch );
set_terrain_seen( gx, gy );
set_envmap_detected_mons(gx, gy, false);
set_envmap_detected_item(gx, gy, false);