Add lightning strike trigger

Author: tesselslate

Ahorn/lang/en_gb.lang

@@ -6,6 +6,13 @@ placements.entities.SpringCollab2020/diagonalWingedStrawberry.tooltips.checkpoin
 # Cave Wall
 placements.entities.SpringCollab2020/caveWall.tooltips.tiletype=Changes the visual appearance of the wall.
 
+# Lightning Strike Trigger
+placements.triggers.SpringCollab2020/LightningStrikeTrigger.tooltips.playerOffset=The X offset of the lightning relative to the player's position.
+placements.triggers.SpringCollab2020/LightningStrikeTrigger.tooltips.seed=The seed for the randomizer which generates the lightning strike.
+placements.triggers.SpringCollab2020/LightningStrikeTrigger.tooltips.delay=The delay, in seconds, between the player entering the trigger and the appearance of the lightning strike.
+placements.triggers.SpringCollab2020/LightningStrikeTrigger.tooltips.rain=Upon lightning strike, rain will begin falling in the level.
+placements.triggers.SpringCollab2020/LightningStrikeTrigger.tooltips.flash=Upon lightning strike, the screen will flash white.
+
 # Variable Crumble Blocks
 
 placements.entities.SpringCollab2020/variableCrumbleBlock.tooltips.texture=The texture of the blocks that are crumbling.2

Ahorn/triggers/lightningStrikeTrigger.jl

@@ -0,0 +1,14 @@
+module SpringCollab2020LightningStrikeTrigger
+
+using ..Ahorn, Maple
+
+@mapdef Trigger "SpringCollab2020/LightningStrikeTrigger" LightningStrikeTrigger(x::Integer, y::Integer, width::Integer=Maple.defaultTriggerWidth, height::Integer=Maple.defaultTriggerHeight, playerOffset::Number=0.0, seed::Integer=0, delay::Number=0.0, rain::Bool=true, flash::Bool=true)
+
+const placements = Ahorn.PlacementDict(
+    "Lightning Strike (Spring Collab 2020)" => Ahorn.EntityPlacement(
+        LightningStrikeTrigger,
+        "rectangle",
+    ),
+)
+
+end

Triggers/LightningStrikeTrigger.cs

@@ -0,0 +1,60 @@
+using Celeste;
+using Celeste.Mod.Entities;
+using Microsoft.Xna.Framework;
+using System.Linq;
+using Monocle;
+using System.Collections;
+
+namespace Celeste.Mod.SpringCollab2020.Triggers {
+    [CustomEntity("SpringCollab2020/LightningStrikeTrigger")]
+    class LightningStrikeTrigger : Trigger {
+        public LightningStrikeTrigger(EntityData data, Vector2 offset) : this(data, offset, data.Float("playerOffset", 0f), data.Int("seed", 0), data.Float("delay", 0f), data.Bool("rain", true), data.Bool("flash", true)) { }
+
+        public LightningStrikeTrigger(EntityData data, Vector2 offset, float playerOffset, int seed, float delay, bool raining, bool flash) : base (data, offset) {
+            PlayerOffset = playerOffset;
+            Seed = seed;
+            Delay = delay;
+            Raining = raining;
+            Flash = flash;
+        }
+
+        public override void OnEnter(Player player) {
+            base.OnEnter(player);
+
+            Level level = player.SceneAs<Level>();
+
+            if(!Activated) {
+                Activated = true;
+                level.Add(new LightningStrike(new Vector2(player.X + PlayerOffset, level.Bounds.Top), Seed, level.Bounds.Height, Delay));
+                Add(new Coroutine(ThunderEffect(level), true));
+
+                if(Raining && !level.Background.Backdrops.OfType<RainFG>().Any()) {
+                    level.Background.Backdrops.Add(new RainFG());
+                }
+            }
+        }
+
+        private IEnumerator ThunderEffect(Level level) {
+            yield return Delay;
+            Audio.Play("event:/new_content/game/10_farewell/lightning_strike");
+            level.Shake(0.3f);
+
+            if(Flash)
+                level.Flash(Color.White, false);
+
+            yield break;
+        }
+
+        public bool Activated { get; private set; }
+
+        private float PlayerOffset;
+
+        private int Seed;
+
+        private float Delay;
+
+        private bool Raining;
+
+        private bool Flash;
+    }
+}