pinchbehavior.cs

pinchbehavior.cs

using UnityEngine;
using System.Collections;
using Leap;

public class PinchBehavior : MonoBehaviour {

	[SerializeField]
	private float _startPinch = 0.75f;
	[SerializeField]
	private float _endPinch = 0.5f;

	private RigidHand _rigid; //Reference to the Rigid Hand script
	private Hand _hand; //Reference to the Latest Leap Motion Hand Object
	private HandController _handController; //Reference to the hand controller script

	private bool _isPinching = false; //Hold whether or not we're pinching.
	private GameObject _pinchedObject;

	// Use this for initialization
	void Start () {
		_pinchedObject = null;
		_handController = GameObject.Find("ControllerSandBox").transform.GetComponent<HandController>();
		_rigid = transform.GetComponent<RigidHand>();
		Debug.Log("_rigid " + _rigid);
		Debug.Log("_hand " + _hand);
	}

	// Update is called once per frame
	void Update () {
		_hand = _rigid.GetLeapHand(); //Get the most recent hand object
		if(_hand == null || _hand == Hand.Invalid) { return; }

		Finger index = Finger.Invalid;
		Finger thumb = Finger.Invalid;
		Vector3 indexPosition;
		Vector3 thumbPosition;
		Vector3 pinchPoint;
		GameObject pinchTarget;

		if(_isPinching) {
			Debug.Log("is pinching");
			foreach(Finger finger in _hand.Fingers) {
				if(finger.Type() == Finger.FingerType.TYPE_INDEX) {
					index = finger;
				}
				else if(finger.Type() == Finger.FingerType.TYPE_THUMB) {
					thumb = finger;
				}

				if(index != Finger.Invalid && thumb != Finger.Invalid) {
					indexPosition = index.Bone(Bone.BoneType.TYPE_DISTAL).NextJoint.ToUnityScaled();
					thumbPosition = index.Bone(Bone.BoneType.TYPE_DISTAL).NextJoint.ToUnityScaled();
					pinchPoint = indexPosition + (0.5f * (thumbPosition - indexPosition));
					pinchPoint = _handController.transform.TransformPoint(pinchPoint);

					if(_pinchedObject == null) {
						pinchTarget = getNearestPinchable(pinchPoint);
					} else  {
						pinchTarget = _pinchedObject;
					}

					pinchTarget.transform.position = pinchPoint;
				}
			}

			if(_hand.PinchStrength <= _endPinch) {
				_isPinching = false;
				_pinchedObject = null;
			}
		}
		else {
			Debug.Log (_hand.PinchStrength);
			if(_hand.PinchStrength >= _startPinch) {
				_isPinching = true;
			}
		}

	}

	GameObject getNearestPinchable(Vector3 targetPosition) {
		GameObject retObj = null;
		float minDist = float.MaxValue;
		GameObject[] pinchables = GameObject.FindGameObjectsWithTag("pinchable");
		foreach(GameObject pinchable in pinchables) {
			float distance = (targetPosition - pinchable.transform.position).magnitude;
			if(distance < minDist) {
				retObj = pinchable;
				minDist = distance;
			}
		}
		return retObj;
	}
}