1 files changed, 33 insertions, 0 deletions
diff --git a/static/src/engine/trailing_position.ts b/static/src/engine/trailing_position.ts
new file mode 100644
index 0000000..1ea22d3
--- /dev/null
+++ b/static/src/engine/trailing_position.ts
@@ -0,0 +1,33 @@
+import { ComponentType, TrailingPositionComponent } from "./component";
+import { Game } from "./game";
+import { System, SystemType } from "./system";
+
+export class TrailingPositionSystem extends System {
+  constructor(
+    private readonly point_filter: (
+      trail_point: {
+        x: number;
+        y: number;
+        time: number;
+      }[],
+    ) => {
+      x: number;
+      y: number;
+      time: number;
+    }[],
+  ) {
+    super(SystemType.TRAILING_POSITION);
+  }
+
+  public update(_dt: number, game: Game) {
+    game.for_each_entity_with_component(
+      ComponentType.TRAILING_POSITION,
+      (entity) => {
+        const trailing_position = entity.components[
+          ComponentType.TRAILING_POSITION
+        ] as TrailingPositionComponent;
+        trailing_position.trails = this.point_filter(trailing_position.trails);
+      },
+    );
+  }
+}