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annotate Orchestland/Assets/LeapMotion/Scripts/Utils/TriggerDrawing.cs @ 1:f7675884f2a1

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Add Orchestland project
author Daiki OYAKAWA <e135764@ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2015 23:09:20 +0900
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1 /******************************************************************************\
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2 * Copyright (C) Leap Motion, Inc. 2011-2014. *
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3 * Leap Motion proprietary. Licensed under Apache 2.0 *
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4 * Available at http://www.apache.org/licenses/LICENSE-2.0.html *
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5 \******************************************************************************/
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6
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7 using UnityEngine;
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8 using System.Collections;
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9 using System.Collections.Generic;
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10 using Leap;
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11
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12 // Leap Motion hand script that detects pinches and grabs the
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13 // closest rigidbody with a spring force if it's within a given range.
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14 public class TriggerDrawing : MonoBehaviour {
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15
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16 public const float TRIGGER_DISTANCE_RATIO = 0.7f;
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17
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18 public float lineWidth = 1.0f;
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19 public float minDistanceForNewPoint = 0.1f;
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20
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21 protected LineRenderer current_line_;
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22 protected int current_line_length_ = 0;
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23 protected List<LineRenderer> lines_;
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24
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25 protected bool drawing_;
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26 protected Collider grabbed_;
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27 protected Vector3 last_draw_position_ = Vector3.zero;
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28
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29 void Start() {
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30 drawing_ = false;
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31 grabbed_ = null;
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32 lines_ = new List<LineRenderer>();
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33 }
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34
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35 void StartNewLine(Vector3 draw_position) {
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36 GameObject line_object = new GameObject();
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37 LineRenderer line_model = GetComponent<LineRenderer>();
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38 current_line_ = line_object.AddComponent<LineRenderer>();
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39 current_line_.materials = line_model.materials;
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40 current_line_.castShadows = line_model.castShadows;
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41 current_line_.receiveShadows = line_model.receiveShadows;
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42 current_line_.SetWidth(lineWidth, lineWidth);
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43
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44 current_line_length_ = 0;
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45 lines_.Add(current_line_);
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46 last_draw_position_ = Vector3.zero;
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47 ContinueLine(draw_position);
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48 }
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49
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50 void ContinueLine(Vector3 draw_position) {
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51 if (Vector3.Distance(draw_position, last_draw_position_) < minDistanceForNewPoint)
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52 return;
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53 current_line_length_++;
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54 current_line_.SetVertexCount(current_line_length_);
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55 current_line_.SetPosition(current_line_length_ - 1, draw_position);
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56 last_draw_position_ = draw_position;
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57 }
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58
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59 void OnDestroy() {
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60 foreach (LineRenderer line in lines_)
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61 Destroy(line.gameObject);
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62 }
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63
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64 void Update() {
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65 bool trigger = false;
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66 HandModel hand_model = GetComponent<HandModel>();
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67 Hand leap_hand = hand_model.GetLeapHand();
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68
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69 if (leap_hand == null)
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70 return;
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71
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72 // Scale trigger distance by thumb proximal bone length.
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73 Vector leap_thumb_tip = leap_hand.Fingers[0].TipPosition;
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74 float proximal_length = leap_hand.Fingers[0].Bone(Bone.BoneType.TYPE_PROXIMAL).Length;
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75 float trigger_distance = proximal_length * TRIGGER_DISTANCE_RATIO;
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76
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77 // Check thumb tip distance to joints on all other fingers.
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78 // If it's close enough, start pinching.
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79 for (int i = 1; i < HandModel.NUM_FINGERS && !trigger; ++i) {
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80 Finger finger = leap_hand.Fingers[i];
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81
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82 for (int j = 0; j < FingerModel.NUM_BONES && !trigger; ++j) {
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83 Vector leap_joint_position = finger.Bone((Bone.BoneType)j).NextJoint;
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84 if (leap_joint_position.DistanceTo(leap_thumb_tip) < trigger_distance)
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85 trigger = true;
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86 }
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87 }
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88
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89 Vector3 draw_position = hand_model.fingers[1].GetTipPosition();
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90
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91 // Only change state if it's different.
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92 if (trigger && !drawing_)
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93 StartNewLine(draw_position);
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94
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95 if (drawing_)
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96 ContinueLine(draw_position);
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97
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98 drawing_ = trigger;
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99 }
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100 }