add pen, animate writing when npc listening to order

Assets/_PROJECT/Scripts/ModeGeneration/Cafe/PenWriter.cs

@@ -0,0 +1,76 @@
+using UnityEngine;
+using DG.Tweening;
+
+public class PenWriter : MonoBehaviour
+{
+    [Header("Assign the transform that moves up/down (pen or tip root)")]
+    public Transform pen;             // If null, uses this.transform
+
+    [Header("Motion Settings")]
+    [Min(0f)] public float minDown = 0.2f; // minimum down stroke depth (in local units)
+    [Min(0f)] public float maxDown = 0.6f; // maximum down stroke depth
+    [Min(0f)] public float minDur = 0.04f; // min duration per tap
+    [Min(0f)] public float maxDur = 0.10f; // max duration per tap
+    [Range(0f, 1f)] public float upFraction = 0.35f; // fraction of tap duration for the up motion (snappy up)
+
+    private Vector3 localUpAxis;
+    private Vector3 baseLocalPos;
+    private bool writing;
+
+    void Awake()
+    {
+        if (!pen) pen = transform;
+        baseLocalPos = pen.localPosition;
+        localUpAxis = transform.InverseTransformDirection(Vector3.up);
+    }
+
+    public void StartWriting()
+    {
+        if (writing) return;
+        writing = true;
+
+        // Ensure any previous tweens are stopped and we reset to rest
+        DOTween.Kill(pen, complete: false);
+        pen.localPosition = baseLocalPos;
+
+        // We<57>ll add a callback that keeps enqueuing the next tap until stopped
+        EnqueueNextTap();
+    }
+
+    public void StopWriting(bool snapToRest = true)
+    {
+        writing = false;
+        DOTween.Kill(pen);
+
+        if (snapToRest)
+            pen.localPosition = baseLocalPos;
+        else
+        {
+            // Smoothly return to rest
+            pen.DOLocalMove(baseLocalPos, 0.08f)
+               .SetEase(Ease.OutSine);
+        }
+    }
+
+    private void EnqueueNextTap()
+    {
+        if (!writing) return;
+
+        float depth = Random.Range(minDown, maxDown);
+        float dur = Random.Range(minDur, maxDur);
+
+        Vector3 downPos = baseLocalPos - localUpAxis * depth;
+
+        float upDur = Mathf.Max(0.01f, dur * upFraction);
+        float downDur = Mathf.Max(0.01f, dur - upDur);
+
+        // Down (contact), then Up (lift)
+        pen.DOLocalMove(downPos, downDur).OnComplete(() =>
+        {
+            pen.DOLocalMove(baseLocalPos, upDur).OnComplete(() =>
+            {
+                if (writing) EnqueueNextTap();
+            });
+        });
+    }
+}