Code Review
- DragRigidbody.cs
- Utility /
- Standard Assets /
- Assets /
- project /
1 using System;
2 using System.Collections;
3 using UnityEngine;
4
5 namespace UnityStandardAssets.Utility
6 {
7 public class DragRigidbody : MonoBehaviour
8 {
9 const float k_Spring = 50.0f;
10 const float k_Damper = 5.0f;
11 const float k_Drag = 10.0f;
12 const float k_AngularDrag = 5.0f;
13 const float k_Distance = 0.2f;
14 const bool k_AttachToCenterOfMass = false;
15
16 private SpringJoint m_SpringJoint;
17
18
19 private void Update()
20 {
21 // Make sure the user pressed the mouse down
22 if (!Input.GetMouseButtonDown(0))
23 {
24 return;
25 }
26
27 var mainCamera = FindCamera();
28
29 // We need to actually hit an object
30 RaycastHit hit = new RaycastHit();
31 if (
32 !Physics.Raycast(mainCamera.ScreenPointToRay(Input.mousePosition).origin,
33 mainCamera.ScreenPointToRay(Input.mousePosition).direction, out hit, 100,
34 Physics.DefaultRaycastLayers))
35 {
36 return;
37 }
38 // We need to hit a rigidbody that is not kinematic
39 if (!hit.rigidbody || hit.rigidbody.isKinematic)
40 {
41 return;
42 }
43
44 if (!m_SpringJoint)
45 {
46 var go = new GameObject("Rigidbody dragger");
47 Rigidbody body = go.AddComponent<Rigidbody>();
48 m_SpringJoint = go.AddComponent<SpringJoint>();
49 body.isKinematic = true;
50 }
51
52 m_SpringJoint.transform.position = hit.point;
53 m_SpringJoint.anchor = Vector3.zero;
54
55 m_SpringJoint.spring = k_Spring;
56 m_SpringJoint.damper = k_Damper;
57 m_SpringJoint.maxDistance = k_Distance;
58 m_SpringJoint.connectedBody = hit.rigidbody;
59
60 StartCoroutine("DragObject", hit.distance);
61 }
62
63
64 private IEnumerator DragObject(float distance)
65 {
66 var oldDrag = m_SpringJoint.connectedBody.drag;
67 var oldAngularDrag = m_SpringJoint.connectedBody.angularDrag;
68 m_SpringJoint.connectedBody.drag = k_Drag;
69 m_SpringJoint.connectedBody.angularDrag = k_AngularDrag;
70 var mainCamera = FindCamera();
71 while (Input.GetMouseButton(0))
72 {
73 var ray = mainCamera.ScreenPointToRay(Input.mousePosition);
74 m_SpringJoint.transform.position = ray.GetPoint(distance);
75 yield return null;
76 }
77 if (m_SpringJoint.connectedBody)
78 {
79 m_SpringJoint.connectedBody.drag = oldDrag;
80 m_SpringJoint.connectedBody.angularDrag = oldAngularDrag;
81 m_SpringJoint.connectedBody = null;
82 }
83 }
84
85
86 private Camera FindCamera()
87 {
88 if (GetComponent<Camera>())
89 {
90 return GetComponent<Camera>();
91 }
92
93 return Camera.main;
94 }
95 }
96 }
2 using System.Collections;
3 using UnityEngine;
4
5 namespace UnityStandardAssets.Utility
6 {
7 public class DragRigidbody : MonoBehaviour
8 {
9 const float k_Spring = 50.0f;
10 const float k_Damper = 5.0f;
11 const float k_Drag = 10.0f;
12 const float k_AngularDrag = 5.0f;
13 const float k_Distance = 0.2f;
14 const bool k_AttachToCenterOfMass = false;
15
16 private SpringJoint m_SpringJoint;
17
18
19 private void Update()
20 {
21 // Make sure the user pressed the mouse down
22 if (!Input.GetMouseButtonDown(0))
23 {
24 return;
25 }
26
27 var mainCamera = FindCamera();
28
29 // We need to actually hit an object
30 RaycastHit hit = new RaycastHit();
31 if (
32 !Physics.Raycast(mainCamera.ScreenPointToRay(Input.mousePosition).origin,
33 mainCamera.ScreenPointToRay(Input.mousePosition).direction, out hit, 100,
34 Physics.DefaultRaycastLayers))
35 {
36 return;
37 }
38 // We need to hit a rigidbody that is not kinematic
39 if (!hit.rigidbody || hit.rigidbody.isKinematic)
40 {
41 return;
42 }
43
44 if (!m_SpringJoint)
45 {
46 var go = new GameObject("Rigidbody dragger");
47 Rigidbody body = go.AddComponent<Rigidbody>();
48 m_SpringJoint = go.AddComponent<SpringJoint>();
49 body.isKinematic = true;
50 }
51
52 m_SpringJoint.transform.position = hit.point;
53 m_SpringJoint.anchor = Vector3.zero;
54
55 m_SpringJoint.spring = k_Spring;
56 m_SpringJoint.damper = k_Damper;
57 m_SpringJoint.maxDistance = k_Distance;
58 m_SpringJoint.connectedBody = hit.rigidbody;
59
60 StartCoroutine("DragObject", hit.distance);
61 }
62
63
64 private IEnumerator DragObject(float distance)
65 {
66 var oldDrag = m_SpringJoint.connectedBody.drag;
67 var oldAngularDrag = m_SpringJoint.connectedBody.angularDrag;
68 m_SpringJoint.connectedBody.drag = k_Drag;
69 m_SpringJoint.connectedBody.angularDrag = k_AngularDrag;
70 var mainCamera = FindCamera();
71 while (Input.GetMouseButton(0))
72 {
73 var ray = mainCamera.ScreenPointToRay(Input.mousePosition);
74 m_SpringJoint.transform.position = ray.GetPoint(distance);
75 yield return null;
76 }
77 if (m_SpringJoint.connectedBody)
78 {
79 m_SpringJoint.connectedBody.drag = oldDrag;
80 m_SpringJoint.connectedBody.angularDrag = oldAngularDrag;
81 m_SpringJoint.connectedBody = null;
82 }
83 }
84
85
86 private Camera FindCamera()
87 {
88 if (GetComponent<Camera>())
89 {
90 return GetComponent<Camera>();
91 }
92
93 return Camera.main;
94 }
95 }
96 }
