Add a cylinder filter

src/main/java/xyz/nucleoid/stimuli/filter/CylinderFilter.java

@@ -0,0 +1,24 @@
+package xyz.nucleoid.stimuli.filter;
+
+import net.minecraft.registry.RegistryKey;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.World;
+import xyz.nucleoid.stimuli.EventSource;
+
+public record CylinderFilter(RegistryKey<World> dimension, BlockPos center, int radius, int height) implements EventFilter {
+    @Override
+    public boolean accepts(EventSource source) {
+        var pos = source.getPos();
+        var dimension = source.getDimension();
+        return (dimension == null || dimension == this.dimension) && (pos == null || this.containsPos(pos));
+    }
+
+    private boolean containsPos(BlockPos pos) {
+        var center = this.center;
+        var radius = this.radius;
+        var height = this.height;
+        var dx = pos.getX() - center.getX();
+        var dz = pos.getZ() - center.getZ();
+        return dx * dx + dz * dz <= radius * radius && pos.getY() >= center.getY() && pos.getY() <= center.getY() + height;
+    }
+}

src/main/java/xyz/nucleoid/stimuli/filter/EventFilter.java

@@ -43,6 +43,19 @@ static EventFilter box(RegistryKey<World> dimension, BlockPos min, BlockPos max)
         return new BoxFilter(dimension, min, max);
     }
 
+    /**
+     * Returns an event filter that accepts only events from the given dimension and cylinder bounds.
+     *
+     * @param dimension the dimension to filter for
+     * @param center the center of the cylinder at bottom
+     * @param radius the radius of the cylinder
+     * @param height the height of the cylinder
+     * @return the result event filter
+     */
+    static EventFilter cylinder(RegistryKey<World> dimension, BlockPos center, int radius, int height) {
+        return new CylinderFilter(dimension, center, radius, height);
+    }
+
     /**
      * Returns an event filter that accepts events from any of the given filters.
      *