Issues with touch input.

I have a c# script working perfectly for mouse ,how can I modify it to work for touch devices.

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using System.Collections.Generic;
4.  
5. public class DrawLine : MonoBehaviour
6. {
7.     private LineRenderer line;
8.     private bool isMousePressed;
9.     private List<Vector3> pointsList;
10.     private Vector3 mousePos;
11.  
12.     // Structure for line points
13.     struct myLine
14.     {
15.         public Vector3 StartPoint;
16.         public Vector3 EndPoint;
17.     };
18.     //    -----------------------------------  
19.     void Awake()
20.     {
21.         // Create line renderer component and set its property
22.         line = gameObject.AddComponent<LineRenderer>();
23.         line.material =  new Material(Shader.Find("Particles/Additive"));
24.         line.SetVertexCount(0);
25.         line.SetWidth(0.1f,0.1f);
26.         line.SetColors(Color.green, Color.green);
27.         line.useWorldSpace = true;  
28.         isMousePressed = false;
29.         pointsList = new List<Vector3>();
30. //        renderer.material.SetTextureOffset(
31.     }
32.     //    -----------------------------------  
33.     void Update ()
34.     {
35.         //Ray ray = Camera.mainCamera.ScreenPointToRay (Input.mousePosition);
36.         //Debug.DrawRay (ray.origin, ray.direction * 10, Color.cyan);
37.         //RaycastHit hit;
38.         //if (Physics.Raycast(ray, out hit)==true)
39.         //{
40.         //    Debug.DrawRay (ray.origin, ray.direction *hit.distance, Color.red);
41.         //}
42.         // If mouse button down, remove old line and set its color to green
43.         if(Input.GetMouseButtonDown(0))
44.         {
45.             isMousePressed = true;
46.             line.SetVertexCount(0);
47.             pointsList.RemoveRange(0,pointsList.Count);
48.             line.SetColors(Color.green, Color.green);
49.  
50.         }
51.         else if(Input.GetMouseButtonUp(0))
52.         {
53.             isMousePressed = false;
54.         }
55.         // Drawing line when mouse is moving(presses)
56.         if(isMousePressed)
57.         {
58.             mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
59.             mousePos.z=0;
60.             if (!pointsList.Contains (mousePos))
61.             {
62.                 pointsList.Add (mousePos);
63.                 line.SetVertexCount (pointsList.Count);
64.                 line.SetPosition (pointsList.Count - 1, (Vector3)pointsList [pointsList.Count - 1]);
65.                 if(isLineCollide() || isLineCollidedWithOtherObject())
66.                 {
67.                     isMousePressed = false;
68.                     line.SetColors(Color.red, Color.red);
69.                 }
70.             }
71.         }
72.     }
73.     //    -----------------------------------  
74.     //  Following method checks is currentLine(line drawn by last two points) collided with line
75.     //    -----------------------------------  
76.     private bool isLineCollide()
77.     {
78.         if (pointsList.Count < 2)
79.             return false;
80.         int TotalLines = pointsList.Count - 1;
81.         myLine[] lines = new myLine[TotalLines];
82.         if (TotalLines > 1)
83.         {
84.             for (int i=0; i<TotalLines; i++)
85.             {
86.                 lines [i].StartPoint = (Vector3)pointsList [i];
87.                 lines [i].EndPoint = (Vector3)pointsList [i + 1];
88.             }
89.         }
90.         for (int i=0; i<TotalLines-1; i++)
91.         {
92.             myLine currentLine;
93.             currentLine.StartPoint = (Vector3)pointsList [pointsList.Count - 2];
94.             currentLine.EndPoint = (Vector3)pointsList [pointsList.Count - 1];
95.             if (isLinesIntersect (lines [i], currentLine))
96.                 return true;
97.         }
98.         return false;
99.     }
100.     //    -----------------------------------  
101.     //    Following method checks whether given two points are same or not
102.     //    -----------------------------------  
103.     private bool checkPoints (Vector3 pointA, Vector3 pointB)
104.     {
105.         return (pointA.x == pointB.x && pointA.y == pointB.y);
106.     }
107.     //    -----------------------------------  
108.     //    Following method checks whether given two line intersect or not
109.     //    -----------------------------------  
110.     private bool isLinesIntersect (myLine L1, myLine L2)
111.     {
112.         if (checkPoints (L1.StartPoint, L2.StartPoint) ||
113.             checkPoints (L1.StartPoint, L2.EndPoint) ||
114.             checkPoints (L1.EndPoint, L2.StartPoint) ||
115.             checkPoints (L1.EndPoint, L2.EndPoint))
116.             return false;
117.        
118.         return((Mathf.Max (L1.StartPoint.x, L1.EndPoint.x) >= Mathf.Min (L2.StartPoint.x, L2.EndPoint.x)) &&
119.                (Mathf.Max (L2.StartPoint.x, L2.EndPoint.x) >= Mathf.Min (L1.StartPoint.x, L1.EndPoint.x)) &&
120.                (Mathf.Max (L1.StartPoint.y, L1.EndPoint.y) >= Mathf.Min (L2.StartPoint.y, L2.EndPoint.y)) &&
121.                (Mathf.Max (L2.StartPoint.y, L2.EndPoint.y) >= Mathf.Min (L1.StartPoint.y, L1.EndPoint.y))
122.                );
123.     }
124.     private bool isLineCollidedWithOtherObject()
125.     {
126.         RaycastHit hit;
127.         Ray ray = Camera.main.ScreenPointToRay(Camera.main.WorldToScreenPoint(pointsList[pointsList.Count-1]));
128.         if(Physics.Raycast(ray,out hit))
129.         {
130.             if(hit.collider.gameObject.CompareTag("alpha"))
131.                 return true;
132.         }
133.         return false;
134.     }
135. }

 

Input.GetTouch should do the trick:

Code (CSharp):

1. if(Input.GetTouch(0).phase == TouchPhase.Began)
2. {
3.     isMousePressed = true;
4.     line.SetVertexCount(0);
5.     pointsList.RemoveRange(0,pointsList.Count);
6.     line.SetColors(Color.green, Color.green);
7. }
8. else if (Input.GetTouch(0).phase == TouchPhase.Ended)
9. {
10.     isMousePressed = false;
11. }
12. // Drawing line when mouse is moving(presses)
13. if(isMousePressed)
14. {
15.     mousePos = Camera.main.ScreenToWorldPoint(Input.GetTouch(0).position);
16.     mousePos.z=0;
17.    /////
18. }

 

Thanks a lot!! But it's not working.When I run it on my android phone,I can't draw anything.

 

The following code creates a line on my device:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using System.Collections.Generic;
4.  
5. public class DrawLine : MonoBehaviour
6. {
7.     private LineRenderer line;
8.     private bool isMousePressed;
9.     private List<Vector3> pointsList = new List<Vector3>();
10.     private Vector3 mousePos;
11.  
12.     // Structure for line points
13.     struct myLine
14.     {
15.         public Vector3 StartPoint;
16.         public Vector3 EndPoint;
17.     };
18.  
19.     void Start()
20.     {
21.         MakeLine ();
22.     }
23.  
24.     void MakeLine()
25.     {
26.         if (line == null)
27.         {
28.             line = gameObject.AddComponent<LineRenderer>();
29.             line.material =  new Material(Shader.Find("Particles/Additive"));
30.             line.SetVertexCount(0);
31.             line.SetWidth(0.1f,0.1f);
32.             line.SetColors(Color.green, Color.green);
33.             line.useWorldSpace = true;
34.             isMousePressed = false;
35.             pointsList = new List<Vector3>();
36.         }
37.     }
38.  
39.     void Update ()
40.     {
41.      
42.         if (Input.touchCount > 0)
43.         {
44.             if(Input.GetTouch(0).phase == TouchPhase.Began)
45.             {
46.                 isMousePressed = true;
47.                 line.SetVertexCount(0);
48.                 pointsList.RemoveRange(0,pointsList.Count);
49.                 line.SetColors(Color.green, Color.green);
50.              
51.             }
52.             else if(Input.GetTouch(0).phase == TouchPhase.Ended)
53.             {
54.                 isMousePressed = false;
55.                 pointsList.Clear();
56.             }
57.             // Drawing line when mouse is moving(presses)
58.             if(isMousePressed)
59.             {
60.                 mousePos = Camera.main.ScreenToWorldPoint(Input.GetTouch(0).position);
61.                 mousePos.z=0;
62.                 if (!pointsList.Contains (mousePos))
63.                 {
64.                     pointsList.Add (mousePos);
65.                     line.SetVertexCount (pointsList.Count);
66.                     line.SetPosition (pointsList.Count - 1, (Vector3)pointsList [pointsList.Count - 1]);
67.                     if(isLineCollide() || isLineCollidedWithOtherObject())
68.                     {
69.                         isMousePressed = false;
70.                         line.SetColors(Color.red, Color.red);
71.                     }
72.                 }
73.             }
74.          
75.         }
76.         if (Application.isEditor) {
77.             if(Input.GetMouseButtonDown(0))
78.             {
79.                 isMousePressed = true;
80.                 line.SetVertexCount(0);
81.                 pointsList.RemoveRange(0,pointsList.Count);
82.                 line.SetColors(Color.green, Color.green);
83.              
84.             }
85.             else if(Input.GetMouseButtonUp(0))
86.             {
87.                 isMousePressed = false;
88.                 pointsList.Clear();
89.             }
90.             // Drawing line when mouse is moving(presses)
91.             if(isMousePressed)
92.             {
93.                 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
94.                 mousePos.z=0;
95.                 if (!pointsList.Contains (mousePos))
96.                 {
97.                     pointsList.Add (mousePos);
98.                     line.SetVertexCount (pointsList.Count);
99.                     line.SetPosition (pointsList.Count - 1, (Vector3)pointsList [pointsList.Count - 1]);
100.                     if(isLineCollide() || isLineCollidedWithOtherObject())
101.                     {
102.                         isMousePressed = false;
103.                         line.SetColors(Color.red, Color.red);
104.                     }
105.                 }
106.             }
107.         }
108.      
109.     }
110.     //    -----------------------------------
111.     //  Following method checks is currentLine(line drawn by last two points) collided with line
112.     //    -----------------------------------
113.     private bool isLineCollide()
114.     {
115.         if (pointsList.Count < 2)
116.             return false;
117.         int TotalLines = pointsList.Count - 1;
118.         myLine[] lines = new myLine[TotalLines];
119.         if (TotalLines > 1)
120.         {
121.             for (int i=0; i<TotalLines; i++)
122.             {
123.                 lines [i].StartPoint = (Vector3)pointsList [i];
124.                 lines [i].EndPoint = (Vector3)pointsList [i + 1];
125.             }
126.         }
127.         for (int i=0; i<TotalLines-1; i++)
128.         {
129.             myLine currentLine;
130.             currentLine.StartPoint = (Vector3)pointsList [pointsList.Count - 2];
131.             currentLine.EndPoint = (Vector3)pointsList [pointsList.Count - 1];
132.             if (isLinesIntersect (lines [i], currentLine))
133.                 return true;
134.         }
135.         return false;
136.     }
137.     //    -----------------------------------
138.     //    Following method checks whether given two points are same or not
139.     //    -----------------------------------
140.     private bool checkPoints (Vector3 pointA, Vector3 pointB)
141.     {
142.         return (pointA.x == pointB.x && pointA.y == pointB.y);
143.     }
144.     //    -----------------------------------
145.     //    Following method checks whether given two line intersect or not
146.     //    -----------------------------------
147.     private bool isLinesIntersect (myLine L1, myLine L2)
148.     {
149.         if (checkPoints (L1.StartPoint, L2.StartPoint) ||
150.             checkPoints (L1.StartPoint, L2.EndPoint) ||
151.             checkPoints (L1.EndPoint, L2.StartPoint) ||
152.             checkPoints (L1.EndPoint, L2.EndPoint))
153.             return false;
154.      
155.         return((Mathf.Max (L1.StartPoint.x, L1.EndPoint.x) >= Mathf.Min (L2.StartPoint.x, L2.EndPoint.x)) &&
156.                (Mathf.Max (L2.StartPoint.x, L2.EndPoint.x) >= Mathf.Min (L1.StartPoint.x, L1.EndPoint.x)) &&
157.                (Mathf.Max (L1.StartPoint.y, L1.EndPoint.y) >= Mathf.Min (L2.StartPoint.y, L2.EndPoint.y)) &&
158.                (Mathf.Max (L2.StartPoint.y, L2.EndPoint.y) >= Mathf.Min (L1.StartPoint.y, L1.EndPoint.y))
159.                );
160.     }
161.     private bool isLineCollidedWithOtherObject()
162.     {
163.         RaycastHit hit;
164.         Ray ray = Camera.main.ScreenPointToRay(Camera.main.WorldToScreenPoint(pointsList[pointsList.Count-1]));
165.         if(Physics.Raycast(ray,out hit))
166.         {
167.             if(hit.collider.gameObject.CompareTag("alpha"))
168.                 return true;
169.         }
170.         return false;
171.     }
172. }

 

Thanks a ton.It worked like charm.But can you please tell how to decrease width of line because it's too thick I changed setwidth but it didn't worked also the collision part is also not working.

 

Shader.Find might return null, I think that this will send in the right direction

 

Thanks a lot.I'm so grateful to you

 

But can you tell me how can I make the line not to disappear after I make new line.I thought of creating 5 game objects with same script and a counter between them.If I want to make 5 lines at a time