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

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

src/spells.rs

@@ -16,9 +16,18 @@ pub enum Spell {
     Invisible,
     Plague,
     Quake,
+    Freeze, // frost: cools lava into obsidian, chills enemies
 }
 
-pub const SPELLS: [Spell; 8] = [Spell::Eye, Spell::CaveIn, Spell::Haste, Spell::Stoneskin, Spell::GoldRain, Spell::Invisible, Spell::Plague, Spell::Quake];
+pub const SPELLS: [Spell; 9] = [Spell::Eye, Spell::CaveIn, Spell::Haste, Spell::Stoneskin, Spell::GoldRain, Spell::Invisible, Spell::Plague, Spell::Quake, Spell::Freeze];
+
+// the icon of a spell (the first eight share one row of the atlas)
+pub fn spell_icon(sp: Spell) -> u32 {
+    match SPELLS.iter().position(|&t| t == sp).unwrap_or(0) {
+        k if k < 8 => crate::gfx::I_SPELLS + k as u32,
+        _ => crate::gfx::I_FREEZE,
+    }
+}
 
 pub const EYE_TIME: f32 = 20.0;
 pub const EYE_RADIUS: f32 = 8.0;
@@ -34,6 +43,7 @@ impl Spell {
             Spell::Invisible => 50.0,
             Spell::Plague => 80.0,
             Spell::Quake => 90.0,
+            Spell::Freeze => 80.0,
         }
     }
     // radius shown under the pointer
@@ -43,6 +53,7 @@ impl Spell {
             Spell::CaveIn => 1.5,
             Spell::Plague => 2.0,
             Spell::Quake => 3.0,
+            Spell::Freeze => 2.5,
             Spell::GoldRain => 0.0,
             _ => 1.6,
         }
@@ -57,6 +68,7 @@ impl Spell {
             Spell::Invisible => "invisible",
             Spell::Plague => "plague",
             Spell::Quake => "quake",
+            Spell::Freeze => "freeze",
         }
     }
 }
@@ -232,6 +244,23 @@ impl Game {
                 }
                 self.sfx(Sfx::Cannon, wx, wy);
             }
+            Spell::Freeze => {
+                // lava turns to obsidian for a while; enemies are chilled and slowed
+                self.cool_lava_around(wx, wy, 2.5, crate::bridges::FREEZE_TIME);
+                let hit: Vec<usize> = (0..self.ents.len()).filter(|&j| foe(&self.ents[j]) && near(&self.ents[j])).collect();
+                for j in hit {
+                    let e = &mut self.ents[j];
+                    e.hp -= 20.0;
+                    e.slow = e.slow.max(4.0);
+                    e.flash = 0.15;
+                    if e.hp <= 0.0 {
+                        self.kill(j);
+                    }
+                }
+                self.part(RING, (wx, wy, 0.05), (0.0, 0.0, 0.0), 0.6, abgr(170, 230, 255), 2.5);
+                self.sparkle(wx, wy, 24, abgr(200, 240, 255));
+                self.sfx(Sfx::Magic, wx, wy);
+            }
         }
         self.mana -= cost;
     }