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annotate Orchestland/Assets/LeapMotion/Widgets/Scripts/Scroll/ScrollBase.cs @ 1:f7675884f2a1
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author | Daiki OYAKAWA <e135764@ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2015 23:09:20 +0900 |
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1
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1 using UnityEngine; |
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2 using System.Collections; |
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3 using LMWidgets; |
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4 |
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5 public class ScrollBase : LeapPhysicsBase { |
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6 public float InteractionScale = 1.0f; |
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7 |
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8 // How strong is the snapping spring. |
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9 public float SnapSpringForce = 100.0f; |
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10 |
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11 // How much drag should be applied ( as a percentage of velocity/second ) |
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12 public float Drag = 5.0f; |
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13 |
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14 // The transform of the root game object of the content to be scrolled. |
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15 public Transform ContentTransform; |
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16 |
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17 // Used to define and top and bottom of the scroll content |
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18 public Transform ContentTopBound; |
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19 public Transform ContentBottomBound; |
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20 |
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21 // Used to define the top and bottom of the scroll container |
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22 public Transform ContainerTopBound; |
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23 public Transform ContainerBottomBound; |
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24 |
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25 // The current velocity of the content. |
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26 protected float m_velocity = 0.0f; |
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27 |
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28 // The dampening force for the edge spring. |
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29 protected float m_dampingForce = 0.0f; |
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30 |
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31 // The location of the scrollable content |
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32 // when interaction began. |
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33 protected Vector3 m_contentPivot; |
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34 |
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35 |
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36 protected virtual void Start () { |
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37 // Set critical dampening force to avoid oscillation. |
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38 m_dampingForce = Mathf.Sqrt(4.0f * SnapSpringForce); |
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39 } |
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40 |
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41 protected override void ResetPivots() { |
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42 base.ResetPivots(); |
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43 m_contentPivot = ContentTransform.localPosition; |
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44 } |
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45 |
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46 protected override void ApplyPhysics() { |
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47 applyOverrunSpringForces(); |
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48 applyDrag(); |
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49 applyVelocity(); |
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50 } |
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51 |
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52 protected void applyDrag() { |
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53 m_velocity -= m_velocity * Mathf.Max(0, Drag * Time.deltaTime); |
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54 } |
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55 |
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56 protected void applyVelocity() { |
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57 Vector3 currentPosition = ContentTransform.localPosition; |
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58 currentPosition.y += m_velocity * Time.deltaTime; |
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59 ContentTransform.localPosition = currentPosition; |
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60 } |
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61 |
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62 /// <summary> |
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63 /// Applies a spring force to velocity to return content to scroller bounds. |
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64 /// </summary> |
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65 protected void applyOverrunSpringForces() { |
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66 float overrunDistance = calculateOverrunMagnitude() * InteractionScale; |
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67 |
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68 if (overrunDistance != 0.0f) { |
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69 float springForce = calculate1DSpringForce(overrunDistance); |
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70 m_velocity += springForce * Time.deltaTime; |
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71 } |
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72 } |
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73 |
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74 // offsetVector is the vector by which the object is offset from the goal |
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75 protected float calculate1DSpringForce(float offsetVector) { |
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76 float springForce = offsetVector * SnapSpringForce; |
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77 float dampingForce = m_dampingForce * (m_velocity); |
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78 return springForce - dampingForce; |
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79 } |
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80 |
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81 // calc the amount and direction (if any) the content has overrun the scroll container. |
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82 protected float calculateOverrunMagnitude() { |
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83 float overrunDistance = 0.0f; |
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84 |
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85 // Put all positions in object space. |
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86 Vector3 localContentTop = transform.InverseTransformPoint(ContentTopBound.position); |
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87 Vector3 localContentBottom = transform.InverseTransformPoint(ContentBottomBound.position); |
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88 Vector3 localContainerTop = transform.InverseTransformPoint(ContainerTopBound.position); |
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89 Vector3 localContainerBottom = transform.InverseTransformPoint(ContainerBottomBound.position); |
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90 |
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91 if (localContentTop.y < localContainerTop.y) { |
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92 overrunDistance = localContainerTop.y - localContentTop.y; |
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93 } |
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94 else if (localContentBottom.y > localContainerBottom.y) { |
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95 overrunDistance = localContainerBottom.y - localContentBottom.y; |
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96 } |
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97 |
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98 return overrunDistance; |
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99 } |
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100 |
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101 protected override void ApplyInteractions() { |
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102 |
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103 Vector3 targetInteractorPositionChange = transform.parent.InverseTransformPoint(m_target.transform.position) - m_targetPivot; |
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104 targetInteractorPositionChange *= InteractionScale; |
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105 targetInteractorPositionChange.x = 0.0f; |
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106 targetInteractorPositionChange.z = 0.0f; |
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107 Vector3 contentCurrentPosition = ContentTransform.localPosition; |
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108 Vector3 newContentPosition = m_contentPivot + targetInteractorPositionChange; |
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109 Vector3 velocity = (newContentPosition - contentCurrentPosition) / Time.deltaTime; |
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110 m_velocity = velocity.y; |
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111 |
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112 ContentTransform.localPosition = newContentPosition; |
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113 } |
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114 |
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115 protected override void ApplyConstraints() { |
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116 return; |
f7675884f2a1
Add Orchestland project
Daiki OYAKAWA <e135764@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
117 } |
f7675884f2a1
Add Orchestland project
Daiki OYAKAWA <e135764@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
118 |
f7675884f2a1
Add Orchestland project
Daiki OYAKAWA <e135764@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
119 } |