1 /*
2 /// 功能： 绘制箭头
3 /// 时间：
4 /// 版本：
5 */
6
7 using System.Collections;
8 using System.Collections.Generic;
9 using UnityEngine;
10 using UnityEngine.UI;
11
12 [AddComponentMenu("UI/Effects/Arrow")]
13 [RequireComponent(typeof(Image))]
14 [ExecuteInEditMode]
15 public class Arrow : BaseMeshEffect
16 {
17 public enum DirectionType
18 {
19 Left,
20 Right,
21 Up,
22 Down,
23 }
24
25 public DirectionType directionType;
26
27 public float width = 1;
28 public float height = 1;
29 public float angle;
30 public Color color;
31
32 private Image image;
33
34 protected override void Start()
35 {
36 image = this.GetComponent<Image>();
37 }
38
39 public override void ModifyMesh(VertexHelper vh)
40 {
41 vh.Clear();
42
43 List<Vector3> vertexList = new List<Vector3>();
44 Vector3 v0=Vector3.zero;
45 Vector3 v1=Vector3.zero;
46 Vector3 v2=Vector3.zero;
47 Vector3 v3=Vector3.zero;
48 Vector3 v4 = Vector3.zero;
49
50 //有5个点"
51 switch (directionType)
52 {
53 case DirectionType.Left:
54 v1 = new Vector3(-width, 0);
55 v2 = new Vector3(-width - height / Mathf.Tan(angle * Mathf.PI / 180), height / 2);
56 v3 = new Vector3(-width, height);
57 v4 = new Vector3(0, height);
58 break;
59 case DirectionType.Right:
60 v1 = new Vector3(width, 0);
61 v2 = new Vector3(width + height / Mathf.Tan(angle * Mathf.PI / 180), height / 2);
62 v3 = new Vector3(width, height);
63 v4 = new Vector3(0, height);
64 break;
65 case DirectionType.Up:
66 v1 = new Vector3(width, 0);
67 v2 = new Vector3(width,height);
68 v3 = new Vector3(width/2, height+height/Mathf.Tan(angle*Mathf.PI/180));
69 v4 = new Vector3(0, height);
70 break;
71 case DirectionType.Down:
72 v1 = new Vector3(width, 0);
73 v2 = new Vector3(width, -height);
74 v3 = new Vector3(width / 2, -height - height / Mathf.Tan(angle * Mathf.PI / 180));
75 v4 = new Vector3(0, -height);
76 break;
77 default:
78 break;
79 }
80
81 vertexList.Add(v0, v1, v2, v3, v4);
82
83 for (int i = 0; i < vertexList.Count; i++)
84 {
85 vh.AddVert(vertexList[i], color, Vector3.zero);
86 }
87
88 vh.AddTriangle(0, 1, 2);
89 vh.AddTriangle(0, 1, 3);
90 vh.AddTriangle(1, 2, 3);
91 vh.AddTriangle(2, 3, 4);
92 vh.AddTriangle(3, 4, 0);
93 vh.AddTriangle(0, 1, 4);
94 }
95
96 private void Update()
97 {
98 image.SetVerticesDirty();
99 }
100 }
