/// <summary>
/// Returns true if this gesture can start.
/// </summary>
/// <returns>Returns <see langword="true"/> if the gesture can start. Returns <see langword="false"/> otherwise.</returns>
protected internal override bool CanStart()
{
if (!touch1.isInProgress || !touch2.isInProgress)
{
Cancel();
return(false);
}
// Check that at least one finger is moving.
if (touch1.delta.ReadValue() == Vector2.zero && touch2.delta.ReadValue() == Vector2.zero)
{
return(false);
}
var pos1 = touch1.position.ReadValue();
var diff1 = (pos1 - StartPosition1).magnitude;
var pos2 = touch2.position.ReadValue();
var diff2 = (pos2 - StartPosition2).magnitude;
var slopInches = (m_Recognizer as TwoFingerDragGestureRecognizer).m_SlopInches;
if (GestureTouchesUtility.PixelsToInches(diff1) < slopInches ||
GestureTouchesUtility.PixelsToInches(diff2) < slopInches)
{
return(false);
}
var recognizer = m_Recognizer as TwoFingerDragGestureRecognizer;
// Check both fingers move in the same direction.
var dot = Vector3.Dot(touch1.delta.ReadValue().normalized, touch2.delta.ReadValue().normalized);
return(!(dot < Mathf.Cos(recognizer.m_AngleThresholdRadians)));
}
protected internal void TryCreateGestureTwoFingerGestureOnTouchBeganForTouchControls(
TouchControl touch1, TouchControl touch2,
Func <TouchControl, TouchControl, T> createGestureFunction)
{
if (m_Gestures.Count != 0)
{
return;
}
if (!touch1.isInProgress ||
GestureTouchesUtility.IsTouchOffScreenEdge(touch1))
{
return;
}
if (!touch2.isInProgress ||
GestureTouchesUtility.IsTouchOffScreenEdge(touch2))
{
return;
}
var gesture = createGestureFunction(touch1, touch2);
gesture.onStart += OnStart;
gesture.onFinished += OnFinished;
m_Gestures.Add(gesture);
}
/// <summary>
/// Action to be performed when this gesture is started.
/// </summary>
protected internal override void OnStart()
{
if (GestureTouchesUtility.RaycastFromCamera(StartPosition1, out var hit1))
{
TargetObject = hit1.transform.gameObject;
}
Position = (touch1.position.ReadValue() + touch2.position.ReadValue()) / 2;
}
/// <summary>
/// Returns true if this gesture can start.
/// </summary>
/// <returns>Returns <see langword="true"/> if the gesture can start. Returns <see langword="false"/> otherwise.</returns>
protected internal override bool CanStart()
{
if (!touch1.isInProgress || !touch2.isInProgress)
{
Cancel();
return(false);
}
// Check that at least one finger is moving.
if (touch1.delta.ReadValue() == Vector2.zero && touch2.delta.ReadValue() == Vector2.zero)
{
return(false);
}
var pinchRecognizer = m_Recognizer as PinchGestureRecognizer;
Vector3 firstToSecondDirection = (startPosition1 - startPosition2).normalized;
var dot1 = Vector3.Dot(touch1.delta.ReadValue().normalized, -firstToSecondDirection);
var dot2 = Vector3.Dot(touch2.delta.ReadValue().normalized, firstToSecondDirection);
var dotThreshold = Mathf.Cos(pinchRecognizer.m_SlopMotionDirectionDegrees * Mathf.Deg2Rad);
// Check angle of motion for the first touch.
if (touch1.delta.ReadValue() != Vector2.zero && Mathf.Abs(dot1) < dotThreshold)
{
return(false);
}
// Check angle of motion for the second touch.
if (touch2.delta.ReadValue() != Vector2.zero && Mathf.Abs(dot2) < dotThreshold)
{
return(false);
}
var deltaPosition = (startPosition1 - startPosition2).magnitude;
gap = (touch1.position.ReadValue() - touch2.position.ReadValue()).magnitude;
startGap = gap;
var separation = GestureTouchesUtility.PixelsToInches(Mathf.Abs(gap - deltaPosition));
return(!(separation < pinchRecognizer.m_SlopInches));
}
