make explosion rumble distance change mid-way through

src/main/java/dev/isxander/controlify/mixins/feature/rumble/explosion/ClientPacketListenerMixin.java

@@ -23,20 +23,27 @@ public class ClientPacketListenerMixin {
 
     @Inject(method = "handleExplosion", at = @At("RETURN"))
     private void onClientExplosion(ClientboundExplodePacket packet, CallbackInfo ci) {
-        float distanceSqr = Math.max(
-                (float)minecraft.player.distanceToSqr(packet.getX(), packet.getY(), packet.getZ())
-                    - packet.getPower() * packet.getPower(), // power is explosion radius
-                0f);
-        float maxDistanceSqr = 4096f; // client only receives explosion packets within 64 blocks
-
-        float magnitude = 1f - Easings.easeOutQuad(distanceSqr / maxDistanceSqr);
+        float initialMagnitude = calculateMagnitude(packet);
 
         ControlifyApi.get().currentController().rumbleManager().play(
                 RumbleSource.EXPLOSION,
                 BasicRumbleEffect.join(
-                        BasicRumbleEffect.constant(magnitude, magnitude, 4), // initial boom
-                        BasicRumbleEffect.byTime(t -> new RumbleState(0f, magnitude - t*magnitude), 20) // explosion
+                        BasicRumbleEffect.constant(initialMagnitude, initialMagnitude, 4), // initial boom
+                        BasicRumbleEffect.byTime(t -> {
+                            float magnitude = calculateMagnitude(packet);
+                            return new RumbleState(0f, magnitude - t * magnitude);
+                        }, 20) // explosion
                 )
         );
     }
+
+    private float calculateMagnitude(ClientboundExplodePacket packet) {
+        float distanceSqr = Math.max(
+                (float)minecraft.player.distanceToSqr(packet.getX(), packet.getY(), packet.getZ())
+                        - packet.getPower() * packet.getPower(), // power is explosion radius
+                0f);
+        float maxDistanceSqr = 4096f; // client only receives explosion packets within 64 blocks
+
+        return 1f - Easings.easeOutQuad(distanceSqr / maxDistanceSqr);
+    }
 }

src/main/java/dev/isxander/controlify/rumble/ContinuousRumbleEffect.java

@@ -1,5 +1,8 @@
 package dev.isxander.controlify.rumble;
 
+import net.minecraft.client.Minecraft;
+import net.minecraft.util.Mth;
+import net.minecraft.world.phys.Vec3;
 import org.apache.commons.lang3.Validate;
 
 import java.util.function.Function;
@@ -60,6 +63,7 @@ public class ContinuousRumbleEffect implements RumbleEffect {
         private int priority;
         private int timeout = -1;
         private int minTime;
+        private InWorldProperties inWorldProperties;
 
         private Builder() {
         }
@@ -97,11 +101,30 @@ public class ContinuousRumbleEffect implements RumbleEffect {
             return this;
         }
 
+        public Builder inWorld(Vec3 sourceLocation, float minMagnitude, float maxMagnitude, float minDistance, float maxDistance, Function<Float, Float> fallofFunction) {
+            this.inWorldProperties = new InWorldProperties(sourceLocation, minMagnitude, maxMagnitude, minDistance, maxDistance, fallofFunction);
+            return this;
+        }
+
         public ContinuousRumbleEffect build() {
             Validate.notNull(stateFunction, "stateFunction cannot be null!");
             Validate.isTrue(minTime <= timeout || timeout == -1, "the minimum time cannot be greater than the timeout!");
 
+            var stateFunction = this.stateFunction;
+            if (inWorldProperties != null)
+                stateFunction = inWorldProperties.modify(stateFunction);
+
             return new ContinuousRumbleEffect(stateFunction, priority, timeout, minTime);
         }
+
+        private record InWorldProperties(Vec3 sourceLocation, float minMagnitude, float maxMagnitude, float minDistance, float maxDistance, Function<Float, Float> fallofFunction) {
+            private Function<Integer, RumbleState> modify(Function<Integer, RumbleState> stateFunction) {
+                return tick -> {
+                    float distanceSqr = (float) Mth.clamp(Minecraft.getInstance().player.distanceToSqr(sourceLocation), minDistance, maxDistance);
+                    float magnitude = Mth.lerp(1f - fallofFunction.apply(distanceSqr / (maxDistance * maxDistance)), minMagnitude, maxMagnitude);
+                    return stateFunction.apply(tick).mul(magnitude);
+                };
+            }
+        }
     }
 }

src/main/java/dev/isxander/controlify/rumble/RumbleState.java

@@ -1,4 +1,7 @@
 package dev.isxander.controlify.rumble;
 
 public record RumbleState(float strong, float weak) {
+    public RumbleState mul(float multiplier) {
+        return new RumbleState(strong * multiplier, weak * multiplier);
+    }
 }