Restrain 2d Sprite's movement so it doesn't go off-screen.

Hey everybody... I'm really struggling here and you all seem so good with this stuff.

I'm allowing a sprite to move back and forth along the x axis. There's no jumping or gravity or physics or anything so I set it to "is kinematic".

Now I have no way of keeping the player on screen. I can't seem to figure out a non-physics way to stop the player from just walking off the screen. This is my player control script so far:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Simplecontrols : MonoBehaviour {
5.     public float speed;
6.     Animator anim;
7.  
8.     void Start()
9.     {
10.         anim = GetComponent<Animator> ();
11.     }
12.  
13.  
14.     void Update ()
15.     {
16.         xmovement();
17.     }
18.  
19.  
20.     void xmovement()
21.     {
22.     if (Input.GetAxisRaw ("Horizontal") > 0)
23.         {
24.             anim.SetBool ("WalkRight", true);
25.             transform.Translate (Vector2.right * speed * Time.deltaTime);
26.         } else
27.         {
28.             anim.SetBool ("WalkRight", false);
29.         }
30.     if (Input.GetAxisRaw ("Horizontal") < 0)
31.         {
32.             anim.SetBool ("WalkLeft", true);
33.             transform.Translate (Vector2.left * speed * Time.deltaTime);
34.         } else
35.         {
36.             anim.SetBool ("WalkLeft", false);
37.         }
38.     }
39. }

Any advice or suggestions to achieve this would be appreciated.

The game is a root-beer tapper style tower defense. Reference for those who don't know rootbeertapper:

Guidance on on how to go about 'jumping' from one walkable row to the next would help a lot... since that's the next thing I'll be working on.

 

Here a version of your script which adds check for the edge of the screen and "jumping". It's pretty quick and dirty, but it should get you started.

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using System.Runtime.Remoting.Messaging;
4.  
5. public class Simplecontrols : MonoBehaviour {
6.     public float speed;
7.     Animator anim;
8.  
9.     float[] yPositions =
10.     {
11.         7f,
12.         3.5f,
13.         0f,
14.         -3.5f,
15.         -7f
16.     };
17.  
18.     int yPosition = 0;
19.  
20.     float width;
21.  
22.     void Start()
23.     {
24.         anim = GetComponent<Animator>();
25.  
26.         width = GetComponent<Renderer>().bounds.extents.x;
27.     }
28.  
29.     void Update()
30.     {
31.         xmovement();
32.     }
33.  
34.  
35.     void xmovement()
36.     {
37.         float minScreen = Camera.main.ViewportToWorldPoint (Vector2.zero).x;
38.         float maxScreen = Camera.main.ViewportToWorldPoint(Vector2.one).x;
39.  
40.         Vector2 pos = transform.position;
41.  
42.         if (Input.GetAxisRaw("Horizontal") > 0)
43.         {
44.             anim.SetBool("WalkRight", true);
45.             pos.x += speed * Time.deltaTime;
46.         }
47.         else
48.         {
49.             anim.SetBool("WalkRight", false);
50.         }
51.  
52.         if (pos.x + width > maxScreen)
53.         {
54.             pos.x = maxScreen - width;
55.         }
56.  
57.         if (Input.GetAxisRaw("Horizontal") < 0)
58.         {
59.             anim.SetBool("WalkLeft", true);
60.             pos.x -= speed * Time.deltaTime;
61.         }
62.         else
63.         {
64.             anim.SetBool("WalkLeft", false);
65.         }
66.  
67.         if (pos.x - width < minScreen)
68.         {
69.             pos.x = minScreen + width;
70.         }
71.  
72.         if (Input.GetKeyDown(KeyCode.UpArrow))
73.         {
74.             yPosition--;
75.  
76.             if (yPosition < 0)
77.             {
78.                 yPosition = 0;
79.             }
80.         }
81.  
82.         if (Input.GetKeyDown(KeyCode.DownArrow))
83.         {
84.             yPosition++;
85.  
86.             if (yPosition >= yPositions.Length)
87.             {
88.                 yPosition = yPositions.Length-1;
89.             }
90.         }
91.  
92.         pos.y = yPositions[yPosition];
93.  
94.         transform.position = pos;
95.     }
96. }
97.  

 

I had no idea how to progress. This gives me a direction to work towards.
You've been so helpful, thanks!

 

I've been playing around and I still can't seem to restrict X movement.
I changed the if statement to:

Code (CSharp):

1.  
2. if (pos.x < 1)
3.         {
4.             pos.x = 1;
5.         }
6.  

Trying to get ANY affect on gameplay... but the guy just keep walking right off screen if he wants, no bounds or limits.

 

I've just tried the script again and it works perfectly for me. Are you using an orthographic camera? Then again, since your change didn't work either that shouldn't be the problem. Are there any other scripts on your guy that might interfer?