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Question by
engineerAmirHosein · Aug 24, 2017 at 12:13 AM ·
2d game
2D Object Following Finger
hi. i have this code to controll my game object by finger in mobile phone. but it works only on objects that they have 3D Collider . my game is 2D and objects have 2DCollider . what should i do to fix it?
//flag to check if the user has tapped / clicked.
//Set to true on click. Reset to false on reaching destination
private bool flag = false;
//destination point
private Vector2 endPoint;
//alter this to change the speed of the movement of player / gameobject
public float duration = 0f;
//vertical position of the gameobject
private float xAxis;
void Start()
{
//save the y axis value of gameobject
xAxis = gameObject.transform.position.z;
}
// Update is called once per frame
void Update()
{
//check if the screen is touched / clicked
if ( (Input.GetMouseButton(0)))
{
//declare a variable of RaycastHit struct
RaycastHit hit;
//Create a Ray on the tapped / clicked position
Ray ray;
//for unity editor
#if UNITY_EDITOR
ray = Camera.main.ScreenPointToRay(Input.mousePosition);
//for touch device
#elif (UNITY_ANDROID || UNITY_IPHONE || UNITY_WP8)
ray = Camera.main.ScreenPointToRay(Input.GetTouch(0).position);
#endif
//Check if the ray hits any collider
if (Physics.Raycast(ray, out hit))
{
//set a flag to indicate to move the gameobject
flag = true;
//save the click / tap position
endPoint = hit.point;
//as we do not want to change the y axis value based on touch position, reset it to original y axis value
endPoint.x = xAxis;
//Debug.Log(endPoint);
}
}
//check if the flag for movement is true and the current gameobject position is not same as the clicked / tapped position
if (flag && !Mathf.Approximately(gameObject.transform.position.magnitude, endPoint.magnitude))
{ //&& !(V3Equal(transform.position, endPoint))){
//move the gameobject to the desired position
gameObject.transform.position = Vector3.Lerp(gameObject.transform.position, endPoint, 1 / (duration * (Vector3.Distance(gameObject.transform.position, endPoint))));
}
//set the movement indicator flag to false if the endPoint and current gameobject position are equal
/*else if (flag && Mathf.Approximately(gameObject.transform.position.magnitude, endPoint.magnitude))
{
flag = false;
Debug.Log("I am here");
}*/
}
Comment
Answer by SneakyLeprechaun · Aug 24, 2017 at 02:18 AM
I'm pretty sure that Raycasts have a completely different version (raycast2d) for 2D games, and the 3D raycast probably doesn't interact with the 2D colliders. To solve your issue instead of raycasting you could instead try Physics2D.OveralpCircle which gets all objects within a radius of a point.