1 using System;
2 using UnityEngine;
3
4 class UILine
5 {
6 GameObject targetObj;
7 LineRenderer lineRenderer; //LineRenderer渲染出的线段的两个端点是3D世界中的点
8 int index = 0;
9 int poinCount = 0; //线段的端点数
10 Vector3 position;
11
12 public void Start(GameObject go, Color beginColor, Color endColor, float begineWidth, float endWidth)
13 {
14 targetObj = go;
15 if (null != targetObj)
16 {
17 targetObj.SetActive(true);
18 lineRenderer = targetObj.GetComponent<LineRenderer>();
19
20 if (null == lineRenderer)
21 lineRenderer = targetObj.AddComponent<LineRenderer>();
22 }
23
24 if (null != lineRenderer)
25 {
26 //颜色
27 lineRenderer.startColor = beginColor;
28 lineRenderer.endColor = endColor;
29
30 //宽度
31 lineRenderer.startWidth = begineWidth;
32 lineRenderer.endWidth = endWidth;
33 }
34
35 index = poinCount = 0;
36 }
37
38 public void Update()
39 {
40 if (Input.GetMouseButton(0))
41 {
42 //屏幕坐标转换为世界坐标
43 position = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, 1.0f));
44 //端点数+1
45 poinCount++;
46 //设置线段的端点数
47 lineRenderer.positionCount = poinCount;
48
49 //连续绘制线段
50 while (index < poinCount)
51 {
52 //两点确定一条直线，所以我们依次绘制点就可以形成线段了
53 lineRenderer.SetPosition(index, position);
54 index++;
55 }
56 }
57 }
58
59 public static UILine BeginLine(GameObject go, Color beginColor, Color endColor, float beginWidth, float endWidth)
60 {
61 UILine line = new UILine();
62 line.Start(go, beginColor, endColor, beginWidth, endWidth);
63 return line;
64 }
65 }
