1 files changed, 54 insertions, 0 deletions
diff --git a/static/src/mouse_controller.ts b/static/src/mouse_controller.ts
new file mode 100644
index 0000000..b8849b4
--- /dev/null
+++ b/static/src/mouse_controller.ts
@@ -0,0 +1,54 @@
+import { Vec2 } from "./vector";
+
+export class MouseController {
+  private readonly debounce_ms = 400;
+  private readonly movement_threshold = 40;
+  private last_event_time = Date.now();
+  private movement_queue: Vec2[] = [];
+  private interval_id: number | null = null;
+
+  constructor(private readonly callback: (new_movement: Vec2) => void) {}
+
+  public start() {
+    if (this.interval_id !== null) {
+      return;
+    }
+    this.interval_id = setInterval(() => {
+      this.publish_movement();
+    }, this.debounce_ms);
+  }
+
+  public stop() {
+    if (this.interval_id === null) {
+      return;
+    }
+    clearInterval(this.interval_id);
+    this.interval_id = null;
+  }
+
+  public move(x: number, y: number) {
+    const new_movement = new Vec2(x, y);
+    const last_movement = this.movement_queue.at(-1);
+    this.movement_queue.push(new_movement);
+    if (
+      typeof last_movement === "undefined" ||
+      new_movement.distance_to(last_movement) < this.movement_threshold
+    ) {
+      return;
+    }
+    this.publish_movement();
+  }
+
+  private publish_movement() {
+    if (
+      Date.now() - this.last_event_time < this.debounce_ms ||
+      this.movement_queue.length === 0
+    ) {
+      return;
+    }
+
+    this.last_event_time = Date.now();
+    this.callback(this.movement_queue.at(-1)!);
+    this.movement_queue = [];
+  }
+}