/// <summary>
/// Returns true if this gesture can start.
/// </summary>
/// <returns>True if the gesture can start.</returns>
protected internal override bool CanStart()
{
if (GestureTouchesUtility.IsFingerIdRetained(FingerId1) ||
GestureTouchesUtility.IsFingerIdRetained(FingerId2))
{
Cancel();
return false;
}
Touch touch1, touch2;
bool foundTouches = GestureTouchesUtility.TryFindTouch(FingerId1, out touch1);
foundTouches = GestureTouchesUtility.TryFindTouch(FingerId2, out touch2) && foundTouches;
if (!foundTouches)
{
Cancel();
return false;
}
// Check that both fingers are moving.
if (touch1.deltaPosition == Vector2.zero || touch2.deltaPosition == Vector2.zero)
{
return false;
}
TwistGestureRecognizer twistRecognizer = m_Recognizer as TwistGestureRecognizer;
float rotation = CalculateDeltaRotation(touch1.position, touch2.position, StartPosition1, StartPosition2);
if (Mathf.Abs(rotation) < twistRecognizer.m_SlopRotation)
{
return false;
}
return true;
}
/// <summary>
/// Returns true if this gesture can start.
/// </summary>
/// <returns>True if the gesture can start.</returns>
protected internal override bool CanStart()
{
if (GestureTouchesUtility.IsFingerIdRetained(FingerId1) ||
GestureTouchesUtility.IsFingerIdRetained(FingerId2))
{
Cancel();
return(false);
}
Touch touch1, touch2;
bool foundTouches = GestureTouchesUtility.TryFindTouch(FingerId1, out touch1);
foundTouches =
GestureTouchesUtility.TryFindTouch(FingerId2, out touch2) && foundTouches;
if (!foundTouches)
{
Cancel();
return(false);
}
// Check that at least one finger is moving.
if (touch1.deltaPosition == Vector2.zero && touch2.deltaPosition == Vector2.zero)
{
return(false);
}
PinchGestureRecognizer pinchRecognizer = Recognizer as PinchGestureRecognizer;
Vector3 firstToSecondDirection = (StartPosition1 - StartPosition2).normalized;
float dot1 = Vector3.Dot(touch1.deltaPosition.normalized, -firstToSecondDirection);
float dot2 = Vector3.Dot(touch2.deltaPosition.normalized, firstToSecondDirection);
float dotThreshold =
Mathf.Cos(pinchRecognizer.SlopMotionDirectionDegrees * Mathf.Deg2Rad);
// Check angle of motion for the first touch.
if (touch1.deltaPosition != Vector2.zero && Mathf.Abs(dot1) < dotThreshold)
{
return(false);
}
// Check angle of motion for the second touch.
if (touch2.deltaPosition != Vector2.zero && Mathf.Abs(dot2) < dotThreshold)
{
return(false);
}
float startgap = (StartPosition1 - StartPosition2).magnitude;
Gap = (touch1.position - touch2.position).magnitude;
float separation = GestureTouchesUtility.PixelsToInches(Mathf.Abs(Gap - startgap));
if (separation < pinchRecognizer.SlopInches)
{
return(false);
}
return(true);
}
/// <summary>
/// Returns true if this gesture can start.
/// </summary>
/// <returns>True if the gesture can start.</returns>
protected internal override bool CanStart()
{
if (GestureTouchesUtility.IsFingerIdRetained(FingerId))
{
Cancel();
return(false);
}
return(true);
}
/// <summary>
/// Returns true if this gesture can start.
/// </summary>
/// <returns>True if the gesture can start.</returns>
protected internal override bool CanStart()
{
if (GestureTouchesUtility.IsFingerIdRetained(FingerId1) ||
GestureTouchesUtility.IsFingerIdRetained(FingerId2))
{
Cancel();
return(false);
}
Touch touch1, touch2;
bool foundTouches = GestureTouchesUtility.TryFindTouch(FingerId1, out touch1);
foundTouches =
GestureTouchesUtility.TryFindTouch(FingerId2, out touch2) && foundTouches;
if (!foundTouches)
{
Cancel();
return(false);
}
// Check that at least one finger is moving.
if (touch1.deltaPosition == Vector2.zero && touch2.deltaPosition == Vector2.zero)
{
return(false);
}
Vector2 pos1 = touch1.position;
float diff1 = (pos1 - StartPosition1).magnitude;
Vector2 pos2 = touch2.position;
float diff2 = (pos2 - StartPosition2).magnitude;
float slopInches = (Recognizer as TwoFingerDragGestureRecognizer).SlopInches;
if (GestureTouchesUtility.PixelsToInches(diff1) < slopInches ||
GestureTouchesUtility.PixelsToInches(diff2) < slopInches)
{
return(false);
}
TwoFingerDragGestureRecognizer recognizer =
Recognizer as TwoFingerDragGestureRecognizer;
// Check both fingers move in the same direction.
float dot =
Vector3.Dot(touch1.deltaPosition.normalized, touch2.deltaPosition.normalized);
if (dot < Mathf.Cos(recognizer.AngleThresholdRadians))
{
return(false);
}
return(true);
}
/// <summary>
/// Returns true if this gesture can start.
/// </summary>
/// <returns>True if the gesture can start.</returns>
protected internal override bool CanStart()
{
if (GestureTouchesUtility.IsFingerIdRetained(FingerId))
{
Cancel();
return(false);
}
if (Input.touches.Length > 1)
{
for (int i = 0; i < Input.touches.Length; i++)
{
Touch currentTouch = Input.touches[i];
if (currentTouch.fingerId != FingerId &&
!GestureTouchesUtility.IsFingerIdRetained(currentTouch.fingerId))
{
return(false);
}
}
}
Touch touch;
if (GestureTouchesUtility.TryFindTouch(FingerId, out touch))
{
Vector2 pos = touch.position;
float diff = (pos - StartPosition).magnitude;
if (GestureTouchesUtility.PixelsToInches(diff) >=
(m_Recognizer as DragGestureRecognizer).m_SlopInches)
{
return(true);
}
}
else
{
Cancel();
}
return(false);
}
