annotate Orchestland/Assets/LeapMotion/Widgets/Scripts/Physics/LeapPhysicsSpring.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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Daiki OYAKAWA <e135764@ie.u-ryukyu.ac.jp>
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1 using UnityEngine;
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2
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3 namespace LMWidgets
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4 {
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5 /// <summary>
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6 /// Base class for spring. Restrains the widget in its local z-axis.
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7 /// It will apply spring physics in ApplyPhysics and translate the button with hand in ApplyInteractions
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8 /// </summary>
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9 public abstract class LeapPhysicsSpring : LeapPhysicsBase
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10 {
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11 /// <summary>
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12 /// Spring constant is separated to xyz-axis for more flexible configuration
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13 /// </summary>
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14 public Vector3 springCoefficient = Vector3.one * 10.0f;
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15 public bool applyCriticalDamping = true;
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16
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17 private Vector3 m_dampingCoefficient = Vector3.zero;
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18 private Vector3 m_interactionConstraints = Vector3.one;
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19
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20 /// <summary>
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21 /// Applies Interaction constraints. Takes in a Vector3. If an axis has value > 0.5 then it's allowed to move. Otherwise it won't be
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22 /// </summary>
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23 /// <param name="interactionConstraints"></param>
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24 protected void ApplyInteractionConstraints(Vector3 interactionConstraints)
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25 {
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26 interactionConstraints.x = (interactionConstraints.x > 0.5f) ? 1.0f : 0.0f;
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27 interactionConstraints.y = (interactionConstraints.y > 0.5f) ? 1.0f : 0.0f;
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28 interactionConstraints.z = (interactionConstraints.z > 0.5f) ? 1.0f : 0.0f;
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29 m_interactionConstraints = interactionConstraints;
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30 ResetPivots();
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31 }
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32
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33 /// <summary>
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34 /// Apply spring physics
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35 /// </summary>
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36 protected override void ApplyPhysics()
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37 {
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38 Vector3 springForce = Vector3.Scale(-springCoefficient, transform.localPosition);
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39 Vector3 dampingForce = Vector3.zero;
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40
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41 if (applyCriticalDamping)
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42 {
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43 Vector3 instantVelocity = springForce * Time.deltaTime;
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44 dampingForce = Vector3.Scale(-m_dampingCoefficient, instantVelocity);
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45 }
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46 transform.localPosition += (springForce + dampingForce) * Time.deltaTime;
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47 }
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48
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49 /// <summary>
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50 /// Translate the widget with the hand during interaction
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51 /// </summary>
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52 protected override void ApplyInteractions()
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53 {
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54 Vector3 displacement = Vector3.Scale(transform.parent.InverseTransformPoint(m_target.transform.position) - m_targetPivot, m_interactionConstraints);
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55 transform.localPosition = displacement + m_pivot;
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56 }
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57
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58 protected override void Awake()
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59 {
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60 base.Awake();
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61 Vector3 k = springCoefficient;
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62 m_dampingCoefficient = 2 * new Vector3(Mathf.Sqrt(k.x), Mathf.Sqrt(k.y), Mathf.Sqrt(k.z));
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63 }
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64 }
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65 }