Merge pull request #139 from EverestAPI/music_layer_fade_trigger

Music Layer Fade Trigger

Author: Cruor

Ahorn/lang/en_gb.lang

@@ -183,3 +183,9 @@ placements.triggers.SpringCollab2020/MadelineSilhouetteTrigger.tooltips.enable=I
 # Rainbow Spinner Color Controller
 placements.entities.SpringCollab2020/RainbowSpinnerColorController.tooltips.colors=The colours the rainbow spinners in the room will take, separated by commas. For example, if 3 colours A, B and C are specified, the colours will cycle in the following order: A > B > C > B > A.
 placements.entities.SpringCollab2020/RainbowSpinnerColorController.tooltips.gradientSize=The distance required to achieve a complete loop across all colours.
+
+# Music Layer Fade Trigger
+placements.triggers.SpringCollab2020/MusicLayerFadeTrigger.tooltips.layers=Which layers the trigger should change.
+placements.triggers.SpringCollab2020/MusicLayerFadeTrigger.tooltips.fadeA=The first volume for the music layer.
+placements.triggers.SpringCollab2020/MusicLayerFadeTrigger.tooltips.fadeB=The second volume for the music layer.
+placements.triggers.SpringCollab2020/MusicLayerFadeTrigger.tooltips.direction=Which direction the layer volume fades between Fade A and Fade B when the player enters the trigger.

Ahorn/triggers/musicLayerFadeTrigger.jl

@@ -0,0 +1,19 @@
+module SpringCollab2020MusicLayerFadeTrigger
+
+using ..Ahorn, Maple
+
+@mapdef Trigger "SpringCollab2020/MusicLayerFadeTrigger" MusicLayerFadeTrigger(x::Integer, y::Integer, width::Integer=Maple.defaultTriggerWidth, height::Integer=Maple.defaultTriggerHeight,
+    layers::String="", fadeA::Number=0.0, fadeB::Number=1.0, direction::String="LeftToRight")
+
+const placements = Ahorn.PlacementDict(
+    "Music Layer Fade (Spring Collab 2020)" => Ahorn.EntityPlacement(
+        MusicLayerFadeTrigger,
+        "rectangle"
+    )
+)
+
+Ahorn.editingOptions(entity::MusicLayerFadeTrigger) = Dict{String, Any}(
+    "direction" => Maple.trigger_position_modes
+)
+
+end

Triggers/MusicLayerFadeTrigger.cs

@@ -0,0 +1,41 @@
+using Celeste.Mod.Entities;
+using Microsoft.Xna.Framework;
+
+namespace Celeste.Mod.SpringCollab2020.Triggers {
+    [CustomEntity("SpringCollab2020/MusicLayerFadeTrigger")]
+    public class MusicLayerFadeTrigger : Trigger {
+
+        private int[] layers;
+        private float fadeA;
+        private float fadeB;
+        private PositionModes direction;
+
+        public MusicLayerFadeTrigger(EntityData data, Vector2 offset)
+            : base(data, offset) {
+
+            // parse the "layers" attribute (for example "1,3,4") as an int array.
+            string[] layersAsStrings = data.Attr("layers").Split(',');
+            layers = new int[layersAsStrings.Length];
+            for (int i = 0; i < layers.Length; i++) {
+                layers[i] = int.Parse(layersAsStrings[i]);
+            }
+
+            // parse the other parameters for the trigger
+            fadeA = data.Float("fadeA", 0f);
+            fadeB = data.Float("fadeB", 1f);
+            direction = data.Enum("direction", PositionModes.LeftToRight);
+        }
+
+        public override void OnStay(Player player) {
+            // compute the current fade value
+            float fade = MathHelper.Lerp(fadeA, fadeB, GetPositionLerp(player, direction));
+
+            // apply it to all the required layers
+            AudioState audio = SceneAs<Level>().Session.Audio;
+            foreach (int layer in layers) {
+                audio.Music.Layer(layer, fade);
+            }
+            audio.Apply();
+        }
+    }
+}