annotate Orchestland/Assets/LeapMotion/Widgets/Scripts/Physics/LeapPhysicsBase.cs @ 1:f7675884f2a1

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 using System;
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2 using UnityEngine;
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3
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4 namespace LMWidgets
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5 {
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6 public enum LeapPhysicsState
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7 {
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8 Interacting, // Responsible for moving the widgets with the fingers
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9 Reflecting, // Responsible for reflecting widget information and simulating the physics
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10 Disabled // State in which the widget is disabled
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11 }
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12
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13 /// <summary>
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14 /// Base class for physics.
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15 /// Handles state changes between Interacting and Reflecting.
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16 /// </summary>
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17 public abstract class LeapPhysicsBase : MonoBehaviour
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18 {
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19 protected event EventHandler<LMWidgets.EventArg<LeapPhysicsState>> StateChangeHandler;
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20
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21 private LeapPhysicsState m_state = LeapPhysicsState.Reflecting; // Don't set this directly. Use accessor.
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22 protected GameObject m_target = null;
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23 protected Vector3 m_pivot = Vector3.zero;
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24 protected Vector3 m_targetPivot = Vector3.zero;
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25
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26 /// <summary>
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27 /// Represents the current Physics state.
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28 /// </summary>
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29 /// <remarks>
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30 /// Use this property to set the state rather than the m_state field so that proper events and functions are called on changes.
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31 /// Chaning the property will also call onInteractionEnabled and onInteractionDisabled as appropritate.
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32 /// </remarks>
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33 protected LeapPhysicsState State {
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34 get {
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35 return m_state;
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36 }
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37 set {
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38
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39 // Call enabled and disabled functions as appropriate.
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40 if ( m_state != LeapPhysicsState.Disabled && value == LeapPhysicsState.Disabled ) {
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41 onInteractionDisabled();
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42 }
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43 else if ( m_state == LeapPhysicsState.Disabled && value != LeapPhysicsState.Disabled ) {
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44 onInteractionEnabled();
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45 }
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46
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47 m_state = value; // Update underlying value
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48
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49 // Fire changed event
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50 EventHandler<LMWidgets.EventArg<LeapPhysicsState>> handler = StateChangeHandler;
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51 if ( handler != null ) { handler(this, new EventArg<LeapPhysicsState>(State)); }
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52 }
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53 }
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54
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55 /// <summary>
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56 /// Represents whether the widget is enabled or disabled.
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57 /// </summary>
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58 public bool Interactable {
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59 get {
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60 return !(State == LeapPhysicsState.Disabled);
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61 }
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62 set {
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63 if (State == LeapPhysicsState.Disabled && value == true ) {
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64 State = LeapPhysicsState.Reflecting;
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65 }
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66 else if (State != LeapPhysicsState.Disabled && value == false) {
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67 State = LeapPhysicsState.Disabled;
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68 }
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69 }
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70 }
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71
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72 // Apply the physics interactions when the hand is no longer interacting with the object
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73 protected abstract void ApplyPhysics();
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74 // Apply interactions with the objects
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75 protected abstract void ApplyInteractions();
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76 // Apply constraints for the object (e.g. Constrain movements along a specific axis)
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77 protected abstract void ApplyConstraints();
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78
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79 /// <summary>
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80 /// Called when widget becomes interactable.
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81 /// </summary>
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82 /// <remarks>
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83 /// Implement this function to handle changes to the widget when interaction is enabled (ie. starting an enable animation)
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84 /// </remarks>
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85 protected virtual void onInteractionEnabled() {}
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86 /// <summary>
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87 /// Called when widget becomes non-interactable.
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88 /// </summary>
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89 /// <remarks>
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90 /// Implement this function to handle changes to the widget when interaction is disabled (ie. starting a disable animation)
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91 /// </remarks>
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92 protected virtual void onInteractionDisabled() {}
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93
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94 /// <summary>
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95 /// Resets the pivots
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96 /// </summary>
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97 protected virtual void ResetPivots()
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98 {
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99 m_pivot = transform.localPosition;
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100 if (m_target != null)
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101 m_targetPivot = transform.parent.InverseTransformPoint(m_target.transform.position);
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102 }
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103
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104 /// <summary>
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105 /// Returns true or false by checking if "HandModel" exits in the parent of the collider
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106 /// </summary>
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107 /// <param name="collider"></param>
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108 /// <returns></returns>
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109 private bool IsHand(Collider collider)
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110 {
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111 return collider.transform.parent && collider.transform.parent.parent && collider.transform.parent.parent.GetComponent<HandModel>();
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112 }
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113
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114 /// <summary>
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115 /// Change the state of the physics to "Interacting" if no other hands were interacting and if the collider is a hand
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116 /// </summary>
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117 /// <param name="collider"></param>
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118 protected virtual void OnTriggerEnter(Collider collider)
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119 {
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120 if (m_target == null && IsHand(collider) && State != LeapPhysicsState.Disabled)
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121 {
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122 State = LeapPhysicsState.Interacting;
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123 m_target = collider.gameObject;
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124 ResetPivots();
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125 }
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126 }
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127
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128 /// <summary>
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129 /// Change the state of the physics to "Reflecting" if the object exiting is the hand
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130 /// </summary>
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131 /// <param name="collider"></param>
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132 protected virtual void OnTriggerExit(Collider collider)
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133 {
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134 // TODO: Use interpolation to determine if the hand should still continue interacting with the widget to solve low-FPS
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135 // TODO(cont): It should solve low-FPS or fast hand movement problems
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136 if (collider.gameObject == m_target)
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137 {
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138 State = LeapPhysicsState.Reflecting;
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139 m_target = null;
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140 }
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141 }
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142
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143 protected virtual void Awake()
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144 {
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145 if (GetComponent<Collider>() == null)
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146 {
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147 Debug.LogWarning("This Widget lacks a collider. Will not function as expected.");
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148 }
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149 }
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150
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151 protected virtual void FixedUpdate()
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152 {
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153 if (m_target == null && State == LeapPhysicsState.Interacting)
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154 {
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155 State = LeapPhysicsState.Reflecting;
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156 }
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157
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158 switch (State)
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159 {
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160 case LeapPhysicsState.Interacting:
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161 ApplyInteractions();
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162 break;
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163 case LeapPhysicsState.Reflecting:
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164 ApplyPhysics();
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165 break;
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166 case LeapPhysicsState.Disabled:
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167 break;
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168 default:
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169 break;
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170 }
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171 ApplyConstraints();
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172 }
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173 }
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174 }