How to not allow hero to "move out of camera"?

Hi,

I'm working on 2d runner game where ship(two circle collision 2d and rigidbody 2d) goes across waves (edge collision 2d objects). User uses left/right arrows to move ship forward/back:



The main problem I'm stuck is imao quite simple: how to prevent ship go out of the camera view when user press left/right?

This code doesn't work so accurate: mostly ship goes out camera view, but sometimes not (especially if move VERY slow):

Code (CSharp):

1.     void FixedUpdate()
2.     {
3.         if (this.isLeftArrowButtonPressing)
4.         {
5.             Vector2 direction = (Vector2)transform.TransformDirection(Vector3.left) * this.ferrySpeed;
6.             Direction clamps = CheckClamps(direction);
7.             bool isLeftClamp = (clamps & Direction.DirectionLeft) == Direction.DirectionLeft;
8.  
9.             if (!isLeftClamp)
10.             {
11.                 this.rb2d.constraints = RigidbodyConstraints2D.None;
12.                 rb2d.velocity = direction;
13.             }
14.             else
15.             {
16.                 Debug.Log("DO NOT MOVE LEFT ANYMORE");
17.             }
18.         }
19.  
20.         if (this.isRightArrowButtonPressing)
21.         {
22.             Vector2 direction = (Vector2)transform.TransformDirection(Vector3.right) * this.ferrySpeed;
23.             Direction clamps = CheckClamps(direction);
24.             bool isRightClamp = (clamps & Direction.DirectionRight) == Direction.DirectionRight;
25.  
26.             if (!isRightClamp)
27.             {
28.                 this.rb2d.constraints = RigidbodyConstraints2D.None;
29.                 rb2d.velocity = direction;
30.             }
31.             else
32.             {
33.                 Debug.Log("DO NOT MOVE RIGHT ANYMORE");
34.             }
35.         }
36.     }
37.  
38.     Direction CheckClamps(Vector2 direction)
39.     {
40.         Direction clamps = Direction.DirectionNone;
41.         Transform camTransform = Camera.main.transform;
42.  
43.         float frustrumPositionLeftX = Camera.main.ViewportToWorldPoint(new Vector3(0, 0, 0)).x;
44.         float frustrumPositionRightX = Camera.main.ViewportToWorldPoint(new Vector3(1, 0, 0)).x;
45.  
46.         Vector2 predictedPoint = new Vector2(this.transform.position.x, this.transform.position.y) + (direction * Time.fixedDeltaTime);
47.  
48.         if (predictedPoint.x <= frustrumPositionLeftX)
49.         {
50.             clamps |= Direction.DirectionLeft;
51.         }
52.  
53.         if (predictedPoint.x >= frustrumPositionRightX)
54.         {
55.             clamps |= Direction.DirectionRight;
56.         }
57.  
58.         return clamps;
59.     }

Thank you in advance

 

Couldn't you add a collider right outside of the camera view, so that the ship is stopped by it?

 

if I add two vertical box colliders from the left and right of the camera the ship starts slightly shaking or rotating by Z order. Maybe you know how to prevent it.

 

In the Inspector -> RigideBody2D -> Constraints(bottom) -> Freeze Rotation Z [ ] check the box