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js/InputHandler.js

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+class InputHandler {
+  constructor(idOfWatchedArea) {
+    const elem = document.getElementById(idOfWatchedArea);
+
+    const handleMouse = ({ offsetX, offsetY }) =>
+      this.setPointerPosition([offsetX, offsetY]);
+    const handleTouch = ({ touches }) =>
+      this.setPointerPosition([touches[0].clientX, touches[0].clientY]);
+
+    elem.addEventListener("mousemove", handleMouse);
+    elem.addEventListener("touchmove", handleTouch);
+
+    this.pointerPosition = [0, 0];
+  }
+
+  setPointerPosition(newPosition) {
+    this.pointerPosition = newPosition;
+  }
+
+  get position() {
+    return this.pointerPosition;
+  }
+}