Unity3D开发之利用GL画曲线

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unity3d开发之利用GL画曲线

1. using UnityEngine;
   
2. 
   
3. using System.Collections;
   
4. 
   
5. using System;
   
6. 
   
7. using System.Collections.Generic;
   
8. 
   
9. public class DrawLine : MonoBehaviour {
   
10. 
    
11. //绘制线段材质
    
12. 
    
13. public Material material;
    
14. 
    
15. private List<Vector3> lineInfo;
    
16. 
    
17. private bool startDraw = false;
    
18. 
    
19. Event e;
    
20. 
    
21. void Start () {
    
22. 
    
23. //初始化鼠标线段链表
    
24. 
    
25. lineInfo = new List<Vector3>();
    
26. 
    
27. }
    
28. 
    
29. void OnGUI(){
    
30. 
    
31. e = Event.current;
    
32. 
    
33. }
    
34. 
    
35. // Update is called once per frame
    
36. 
    
37. void Update () {
    
38. 
    
39. if(e.type == EventType.MouseDown)
    
40. 
    
41. {
    
42. 
    
43. startDraw = true;
    
44. 
    
45. }
    
46. 
    
47. if(e.type==EventType.MouseDrag)
    
48. 
    
49. {
    
50. 
    
51. if(startDraw == true){
    
52. 
    
53. //将每次鼠标经过的位置存储进链表
    
54. 
    
55. lineInfo.Add(Input.mousePosition);
    
56. 
    
57. }
    
58. 
    
59. }
    
60. 
    
61. if(e.type==EventType.MouseUp)
    
62. 
    
63. {
    
64. 
    
65. startDraw = false;
    
66. 
    
67. lineInfo.Clear();
    
68. 
    
69. }
    
70. 
    
71. }
    
72. 
    
73. //GL的绘制方法系统回调
    
74. 
    
75. void OnPostRender()
    
76. 
    
77. {
    
78. 
    
79. if(!material)
    
80. 
    
81. {
    
82. 
    
83. Debug.LogError(“material == null”);
    
84. 
    
85. return;
    
86. 
    
87. }
    
88. 
    
89. //材质通道，0为默认。
    
90. 
    
91. material.SetPass(0);
    
92. 
    
93. //绘制2D图像
    
94. 
    
95. GL.LoadOrtho();
    
96. 
    
97. //得到鼠标点信息总数量
    
98. 
    
99. GL.Begin(GL.LINES);
    
100. 
     
101. //遍历鼠标点的链表
     
102. 
     
103. int size = lineInfo.Count;
     
104. 
     
105. for(int i =0; i < size - 1;i++)
     
106. 
     
107. {
     
108. 
     
109. Vector3 start = lineInfo[i];
     
110. 
     
111. Vector3 end = lineInfo[i+1];
     
112. 
     
113. //绘制线
     
114. 
     
115. DrawLineFun(start.x,start.y,end.x,end.y);
     
116. 
     
117. }
     
118. 
     
119. //结束绘制
     
120. 
     
121. GL.End();
     
122. 
     
123. }
     
124. 
     
125. void DrawLineFun(float x1,float y1,float x2,float y2)
     
126. 
     
127. {
     
128. 
     
129. //绘制线段
     
130. 
     
131. GL.Vertex(new Vector3(x1 / Screen.width,y1 / Screen.height,0));
     
132. 
     
133. GL.Vertex(new Vector3(x2 / Screen.width, y2 / Screen.height,0));
     
134. 
     
135. }
     
136. 
     
137. }

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