public void Reset()
{
this.incrementalTranslation = Swipe.Id();
this.incrementalScaling = Swipe.Id();
this.lastPinchPan = Swipe.Id();
this.dragging = false;
this.swiping = false;
this.displayPinchOrigin = false;
this.pinchOrigin = new SKPoint(0, 0);
this.setManualPinchPan(Swipe.Id());
}
public static void OnTouchEffectAction(object sender, TouchActionEventArgs e)
{
KTouchClient kTouchClient = sender as KTouchClient;
KTouchClientData data = kTouchClient.data;
// Touch location is given in Xamarin independent display units, and must be multiplied by display density to work at all platforms and resolutions
// e.Location comes from Android TouchEffect.Droid.FireEvent and iOS TouchRecognizer.FireEvent
double density = DeviceDisplay.MainDisplayInfo.Density;
SKPoint location = new SKPoint((float)(e.Location.X * density), (float)(e.Location.Y * density));
if (e.Type == TouchActionType.Pressed)
{
if (data.fingers.PressedOne(e.Id, location, e.IsInContact))
{
data.displayPinchOrigin = true;
}
else if (data.fingers.PressedTwo(e.Id, location, e.IsInContact))
{
data.incrementalTranslation = Swipe.Id();
data.incrementalScaling = Swipe.Id();
data.displayPinchOrigin = true;
data.swiping = true;
}
}
else if (e.Type == TouchActionType.Moved)
{
if (data.fingers.Moved(e.Id, location, e.IsInContact))
{
if (data.fingers.OneContact())
{
data.pinchOrigin = location; // display the location of swiping
data.onTouchSwipeOrMouseDrag?.Invoke(data.fingers.fingerOne.initialLocation, location);
data.dragging = true;
}
else if (data.fingers.TwoContacts())
{
SKPoint translation = data.fingers.Translation();
SKPoint scalingOrigin = data.fingers.Center();
float scaling = data.fingers.Scaling();
data.incrementalTranslation = new Swipe(1, translation);
data.incrementalScaling = new Swipe(scaling, new SKPoint((1 - scaling) * scalingOrigin.X, (1 - scaling) * scalingOrigin.Y)); // scaling around the scaleOrigin
data.pinchOrigin = scalingOrigin; // display the center of scaling
data.setManualPinchPan?.Invoke(data.lastPinchPan * data.incrementalScaling * data.incrementalTranslation);
data.invalidateSurface();
}
}
}
else if (e.Type == TouchActionType.Released)
{
if (data.fingers.TwoFingerTapped(e.Id))
{
data.lastPinchPan = Swipe.Id();
data.setManualPinchPan?.Invoke(data.lastPinchPan);
data.invalidateSurface();
}
if (data.fingers.ReleasingTwo(e.Id, location, e.IsInContact))
{
}
else if (data.fingers.ReleasingOne(e.Id, location, e.IsInContact))
{
if (data.swiping)
{
data.swiping = false;
data.lastPinchPan = data.lastPinchPan * data.incrementalScaling * data.incrementalTranslation;
data.lastPinchPan = new Swipe(Math.Max(0.1f, data.lastPinchPan.scale), data.lastPinchPan.translate);
data.setManualPinchPan?.Invoke(data.lastPinchPan);
data.invalidateSurface();
}
else
{
if (data.fingers.DoubleTapped(e.Id))
{
data.onTouchDoubletapOrMouseClick?.Invoke(location);
}
else if (data.fingers.Tapped(e.Id))
{
data.onTouchTapOrMouseMove?.Invoke(location);
}
if (data.dragging)
{
data.dragging = false;
data.onTouchSwipeOrMouseDragEnd?.Invoke(data.fingers.fingerOne.initialLocation, location);
}
}
}
if (data.fingers.Released(e.Id))
{
data.displayPinchOrigin = false;
}
}
else if (e.Type == TouchActionType.Entered)
{
}
else if (e.Type == TouchActionType.Exited)
{
}
else if (e.Type == TouchActionType.Cancelled)
{
}
}
