Drawbridges (down, up, automatic), frost spell and obsidian over cooled lava

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/scenes.rs

@@ -162,4 +162,31 @@ fn export_scenes() {
     g.place_all_torches();
     run(&mut g, 4.0);
     save("lava-light", &mut g, cx as f32 + 5.0, cy as f32, 22.0, 0.0, false);
+
+    // bridges: a raised and a lowered drawbridge over water, a burning bridge, obsidian on lava
+    let mut g = Game::new(17, 80, 64);
+    let (cx, cy) = g.map.core;
+    g.gold = 50000.0;
+    open(&mut g, cx - 6, cy - 9, cx + 18, cy + 9);
+    for y in cy - 9..=cy + 9 {
+        for x in cx + 6..cx + 9 {
+            let t = &mut g.map.t[idx(x, y)];
+            t.kind = Kind::Water;
+            t.owner = Owner::None;
+        }
+        for x in cx + 12..cx + 15 {
+            let t = &mut g.map.t[idx(x, y)];
+            t.kind = Kind::Lava;
+            t.owner = Owner::None;
+        }
+    }
+    g.drawbridge_order(cx + 5, cy - 5, cx + 9, cy - 5);
+    g.drawbridge_order(cx + 5, cy - 1, cx + 9, cy - 1);
+    g.drawbridge_order(cx + 6, cy - 1, cx + 6, cy - 1); // raised
+    g.build_bridges(cx + 5, cy + 4, cx + 9, cy + 4);
+    g.ignite_at(cx as f32 + 7.5, cy as f32 + 4.5);
+    g.cool_lava_around(cx as f32 + 13.5, cy as f32 + 1.5, 2.5, 60.0);
+    g.place_all_torches();
+    run(&mut g, 2.5);
+    save("bridges", &mut g, cx as f32 + 9.0, cy as f32, 18.0, 0.0, false);
 }