TwistGesture(TwistGestureRecognizer recognizer, CommonTouch touch1, CommonTouch touch2) : base(recognizer)
{
fingerId1 = touch1.fingerId;
fingerId2 = touch2.fingerId;
startPosition1 = touch1.position;
startPosition2 = touch2.position;
}
/// <summary>
/// Constructs a PinchGesture gesture.
/// </summary>
/// <param name="recognizer">The gesture recognizer.</param>
/// <param name="touch1">The first touch that started this gesture.</param>
/// <param name="touch2">The second touch that started this gesture.</param>
public TwistGesture(TwistGestureRecognizer recognizer, Touch touch1, Touch touch2) :
base(recognizer)
{
FingerId1 = touch1.fingerId;
FingerId2 = touch2.fingerId;
StartPosition1 = touch1.position;
StartPosition2 = touch2.position;
}
/// <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>
/// Constructs a PinchGesture gesture.
/// </summary>
/// <param name="recognizer">The gesture recognizer.</param>
/// <param name="touch1">The first touch that started this gesture.</param>
/// <param name="touch2">The second touch that started this gesture.</param>
public TwistGesture(TwistGestureRecognizer recognizer, InputSystem.EnhancedTouch.Touch touch1, InputSystem.EnhancedTouch.Touch touch2)
: this(recognizer, new CommonTouch(touch1), new CommonTouch(touch2))
{
}
/// <summary>
/// Constructs a PinchGesture gesture.
/// </summary>
/// <param name="recognizer">The gesture recognizer.</param>
/// <param name="touch1">The first touch that started this gesture.</param>
/// <param name="touch2">The second touch that started this gesture.</param>
public TwistGesture(TwistGestureRecognizer recognizer, Touch touch1, Touch touch2)
: this(recognizer, new CommonTouch(touch1), new CommonTouch(touch2))
{
}