强制性引导UI控件，关键区域镂空，自动调整关键区域大小。
效果如图：
使用结构：
代
1
using UnityEngine;
2using System.Collections;
3using UnityEngine.UI;
4
5using System.Collections.Generic;
6using UnityEngine.Serialization;
7
8namespace UnityEngine.UI
9
{
10
11 public class GuideHighlightMask : MaskableGraphic, UnityEngine.ICanvasRaycastFilter
12
{
13 public RectTransform arrow;
14 public Vector2 center = Vector2.zero;
15 public Vector2 size = new Vector2(100, 100);
16
17 public void DoUpdate()
18 {
19 // 当引导箭头位置或者大小改变后更新，注意：未处理拉伸模式
20 if (arrow && center != arrow.anchoredPosition || size != arrow.sizeDelta)
21 {
22 this.center = arrow.anchoredPosition;
23 this.size = arrow.sizeDelta;
24 SetAllDirty();
25
}
26 }
27
28 public bool IsRaycastLocationValid(Vector2 sp, Camera eventCamera)
29 {
30 // 点击在箭头框内部则无效，否则生效
31 return !RectTransformUtility.RectangleContainsScreenPoint(arrow, sp, eventCamera);
32 }
33
34 protected override void OnFillVBO(List<UIVertex> vbo)
35 {
36 Vector4 outer = new Vector4(-rectTransform.pivot.x * rectTransform.rect.width,
37 -rectTransform.pivot.y * rectTransform.rect.height,
38 (1 - rectTransform.pivot.x) * rectTransform.rect.width,
39 (1 - rectTransform.pivot.y) * rectTransform.rect.height);
40
41 Vector4 inner = new Vector4(center.x - size.x / 2,
42 center.y - size.y / 2,
43 center.x + size.x * 0.5f,
44 center.y + size.y * 0.5f);
45
46 vbo.Clear();
47
48 var vert = UIVertex.simpleVert;
49
50 // left
51 vert.position = new Vector2(outer.x, outer.y);
52 vert.color = color;
53 vbo.Add(vert);
54
55 vert.position = new Vector2(outer.x, outer.w);
56 vert.color = color;
57 vbo.Add(vert);
58
59 vert.position = new Vector2(inner.x, outer.w);
60 vert.color = color;
61 vbo.Add(vert);
62
63 vert.position = new Vector2(inner.x, outer.y);
64 vert.color = color;
65 vbo.Add(vert);
66
67 // top
68 vert.position = new Vector2(inner.x, inner.w);
69 vert.color = color;
70 vbo.Add(vert);
71
72 vert.position = new Vector2(inner.x, outer.w);
73 vert.color = color;
74 vbo.Add(vert);
75
76 vert.position = new Vector2(inner.z, outer.w);
77 vert.color = color;
78 vbo.Add(vert);
79
80 vert.position = new Vector2(inner.z, inner.w);
81 vert.color = color;
82 vbo.Add(vert);
83
84 // right
85 vert.position = new Vector2(inner.z, outer.y);
86 vert.color = color;
87 vbo.Add(vert);
88
89 vert.position = new Vector2(inner.z, outer.w);
90 vert.color = color;
91 vbo.Add(vert);
92
93 vert.position = new Vector2(outer.z, outer.w);
94 vert.color = color;
95 vbo.Add(vert);
96
97 vert.position = new Vector2(outer.z, outer.y);
98 vert.color = color;
99 vbo.Add(vert);
100
101 // bottom
102 vert.position = new Vector2(inner.x, outer.y);
103 vert.color = color;
104 vbo.Add(vert);
105
106 vert.position = new Vector2(inner.x, inner.y);
107 vert.color = color;
108 vbo.Add(vert);
109
110 vert.position = new Vector2(inner.z, inner.y);
111 vert.color = color;
112 vbo.Add(vert);
113
114 vert.position = new Vector2(inner.z, outer.y);
115 vert.color = color;
116 vbo.Add(vert);
117 }
118
119 private void Update()
120 {
121 DoUpdate();
122 }
123 }
124
}
125
码：