实现鼠标拖拽缩放功能代码

王者再临

1. using UnityEngine;
   
2. 
   
3. using System.Collections;
   
4. 
   
5. public class Script_07_11 : MonoBehaviour
   
6. 
   
7. {
   
8. 
   
9. public Transform target;
   
10. 
    
11. private int MouseWheelSensitivity = 1;
    
12. 
    
13. private int MouseZoomMin = 1;
    
14. 
    
15. private int MouseZoomMax = 5;
    
16. 
    
17. private float normalDistance = 3;
    
18. 
    
19. private Vector3 normalized;
    
20. 
    
21. private float xSpeed = 250.0f;
    
22. 
    
23. private float ySpeed = 120.0f;
    
24. 
    
25. private int yMinLimit = -20;
    
26. 
    
27. private int yMaxLimit = 80;
    
28. 
    
29. private float x = 0.0f;
    
30. 
    
31. private float y = 0.0f;
    
32. 
    
33. private Vector3 screenPoint;
    
34. 
    
35. private Vector3 offset;
    
36. 
    
37. private Quaternion rotation = Quaternion.Euler(new Vector3(30f,0f,0f));
    
38. 
    
39. private Vector3 CameraTarget;
    
40. 
    
41. void Start ()
    
42. 
    
43. {
    
44. 
    
45. CameraTarget = target.position;
    
46. 
    
47. float z = target.transform.position.z - normalDistance;
    
48. 
    
49. transform.position =  rotation * new Vector3(transform.position.x,transform.position.y,z);
    
50. 
    
51. transform.LookAt(target);
    
52. 
    
53. var angles = transform.eulerAngles;
    
54. 
    
55. x = angles.y;
    
56. 
    
57. y = angles.x;
    
58. 
    
59. }
    
60. 
    
61. void Update ()
    
62. 
    
63. {
    
64. 
    
65. if(Input.GetMouseButton(1))
    
66. 
    
67. {
    
68. 
    
69. x += Input.GetAxis(“Mouse X”) * xSpeed * 0.02f;
    
70. 
    
71. y -= Input.GetAxis(“Mouse Y”) * ySpeed * 0.02f;
    
72. 
    
73. y = ClampAngle(y, yMinLimit, yMaxLimit);
    
74. 
    
75. var rotation = Quaternion.Euler(y, x, 0);
    
76. 
    
77. var position = rotation * new Vector3(0.0f, 0.0f, -normalDistance) + CameraTarget;
    
78. 
    
79. transform.rotation = rotation;
    
80. 
    
81. transform.position = position;
    
82. 
    
83. }else if (Input.GetAxis(“Mouse ScrollWheel”) != 0)
    
84. 
    
85. {
    
86. 
    
87. normalized = (transform.position - CameraTarget).normalized;
    
88. 
    
89. if (normalDistance >= MouseZoomMin && normalDistance <= MouseZoomMax)
    
90. 
    
91. {
    
92. 
    
93. normalDistance -= Input.GetAxis(“Mouse ScrollWheel”) * MouseWheelSensitivity;
    
94. 
    
95. }
    
96. 
    
97. if (normalDistance < MouseZoomMin)
    
98. 
    
99. {
    
100. 
     
101. normalDistance = MouseZoomMin;
     
102. 
     
103. }
     
104. 
     
105. if (normalDistance > MouseZoomMax)
     
106. 
     
107. {
     
108. 
     
109. normalDistance = MouseZoomMax;
     
110. 
     
111. }
     
112. 
     
113. transform.position =    normalized * normalDistance;
     
114. 
     
115. }else if(Input.GetMouseButtonDown(2))
     
116. 
     
117. {
     
118. 
     
119. screenPoint = Camera.main.WorldToScreenPoint(target.transform.position);
     
120. 
     
121. offset = target.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z));
     
122. 
     
123. }
     
124. 
     
125. //unity3d：http://www.unitymanual.com/
     
126. 
     
127. if(Input.GetMouseButton(2))
     
128. 
     
129. {
     
130. 
     
131. Vector3 curScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z);
     
132. 
     
133. Vector3 curPosition = Camera.main.ScreenToWorldPoint(curScreenPoint) + offset;
     
134. 
     
135. target.transform.position = curPosition;
     
136. 
     
137. }
     
138. 
     
139. transform.LookAt(CameraTarget);
     
140. 
     
141. }
     
142. 
     
143. static float ClampAngle (float angle , float min ,float  max)
     
144. 
     
145. {
     
146. 
     
147. if (angle < -360)
     
148. 
     
149. angle += 360;
     
150. 
     
151. if (angle > 360)
     
152. 
     
153. angle -= 360;
     
154. 
     
155. return Mathf.Clamp (angle, min, max);
     
156. 
     
157. }

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我不再年轻

不错， 学习了！