koobas.hobune.stream
How should I Clamp a Mouseposition to a circle?
So basically I want to be able to move my mouse everywhere BUT the circle
I have tried this:
public Transform crosshair, ship;
public float rotationSpeed = 10f, radius = 5f;
void Start()
{
Cursor.visible = false;
}
void Update()
{
Vector2 mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
Vector2 cantTouchThis = ship.position;
Vector2 direction = mousePosition - cantTouchThis; //direction from Ship to Cursor
direction = Vector2.ClampMagnitude(direction, radius);
crosshair.position = cantTouchThis + direction;
}
Now how would I invert Vector2.ClampMagnitude(direction, radius) ?
Best Answer
I figured I didn't need to use Vector2.ClampMagnitude so I updated it to this:
public Transform crosshair, ship;
public float rotationSpeed = 10f, radius = 1f;
void Start()
{
Cursor.visible = false;
}
void Update()
{
Vector2 mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
Vector2 center = ship.position;
Vector2 direction = mousePosition - center; //direction from Center to Cursor
Vector2 normalizedDirection = direction.normalized;
crosshair.position = center + (normalizedDirection * radius);
}
I hope someone else can get something from it, if not. Sorry for the clutter.
ClampMagnitude ensures that the vector is not longer than the given length. The actual code behind ClampMagnitude is this:
public static Vector3 ClampMagnitude(Vector3 vector, float maxLength)
{
if (vector.sqrMagnitude > maxLength * maxLength)
return vector.normalized * maxLength;
return vector;
}
In order to invert the behaviour you just have to reverse the comparison from > to <
public static Vector3 ClampMagnitudeMin(Vector3 vector, float minLength)
{
if (vector.sqrMagnitude < minLength * minLength)
return vector.normalized * minLength;
return vector;
}
I just realised you used Vector2, however the concept is still the same. You can replace Vector3 with Vector2
