--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Orchestland/Assets/LeapMotion/Scripts/Utils/TriggerDrawing.cs	Fri Jul 17 23:09:20 2015 +0900
@@ -0,0 +1,100 @@
+/******************************************************************************\
+* Copyright (C) Leap Motion, Inc. 2011-2014.                                   *
+* Leap Motion proprietary. Licensed under Apache 2.0                           *
+* Available at http://www.apache.org/licenses/LICENSE-2.0.html                 *
+\******************************************************************************/
+
+using UnityEngine;
+using System.Collections;
+using System.Collections.Generic;
+using Leap;
+
+// Leap Motion hand script that detects pinches and grabs the
+// closest rigidbody with a spring force if it's within a given range.
+public class TriggerDrawing : MonoBehaviour {
+
+  public const float TRIGGER_DISTANCE_RATIO = 0.7f;
+
+  public float lineWidth = 1.0f;
+  public float minDistanceForNewPoint = 0.1f;
+
+  protected LineRenderer current_line_;
+  protected int current_line_length_ = 0;
+  protected List<LineRenderer> lines_;
+
+  protected bool drawing_;
+  protected Collider grabbed_;
+  protected Vector3 last_draw_position_ = Vector3.zero;
+
+  void Start() {
+    drawing_ = false;
+    grabbed_ = null;
+    lines_ = new List<LineRenderer>();
+  }
+
+  void StartNewLine(Vector3 draw_position) {
+    GameObject line_object = new GameObject();
+    LineRenderer line_model = GetComponent<LineRenderer>();
+    current_line_ = line_object.AddComponent<LineRenderer>();
+    current_line_.materials = line_model.materials;
+    current_line_.castShadows = line_model.castShadows;
+    current_line_.receiveShadows = line_model.receiveShadows;
+    current_line_.SetWidth(lineWidth, lineWidth);
+
+    current_line_length_ = 0;
+    lines_.Add(current_line_);
+    last_draw_position_ = Vector3.zero;
+    ContinueLine(draw_position);
+  }
+
+  void ContinueLine(Vector3 draw_position) {
+    if (Vector3.Distance(draw_position, last_draw_position_) < minDistanceForNewPoint)
+      return;
+    current_line_length_++;
+    current_line_.SetVertexCount(current_line_length_);
+    current_line_.SetPosition(current_line_length_ - 1, draw_position);
+    last_draw_position_ = draw_position;
+  }
+
+  void OnDestroy() {
+    foreach (LineRenderer line in lines_)
+      Destroy(line.gameObject);
+  }
+
+  void Update() {
+    bool trigger = false;
+    HandModel hand_model = GetComponent<HandModel>();
+    Hand leap_hand = hand_model.GetLeapHand();
+
+    if (leap_hand == null)
+      return;
+
+    // Scale trigger distance by thumb proximal bone length.
+    Vector leap_thumb_tip = leap_hand.Fingers[0].TipPosition;
+    float proximal_length = leap_hand.Fingers[0].Bone(Bone.BoneType.TYPE_PROXIMAL).Length;
+    float trigger_distance = proximal_length * TRIGGER_DISTANCE_RATIO;
+
+    // Check thumb tip distance to joints on all other fingers.
+    // If it's close enough, start pinching.
+    for (int i = 1; i < HandModel.NUM_FINGERS && !trigger; ++i) {
+      Finger finger = leap_hand.Fingers[i];
+
+      for (int j = 0; j < FingerModel.NUM_BONES && !trigger; ++j) {
+        Vector leap_joint_position = finger.Bone((Bone.BoneType)j).NextJoint;
+        if (leap_joint_position.DistanceTo(leap_thumb_tip) < trigger_distance)
+          trigger = true;
+      }
+    }
+
+    Vector3 draw_position = hand_model.fingers[1].GetTipPosition();
+
+    // Only change state if it's different.
+    if (trigger && !drawing_)
+      StartNewLine(draw_position);
+    
+    if (drawing_)
+      ContinueLine(draw_position);
+
+    drawing_ = trigger;
+  }
+}