private void EndTouch(TouchState touch)
{
var index = IndexOfTouch(touch);
if (index < 0)
{
return;
}
var duration = _activeTouches[index].Duration;
_activeTouches.RemoveAt(index);
if (_activeTouches.Count == 0)
{
if (_potentialClick)
{
var contact = _environment.Raycast(touch.ScreenPosition);
if (duration > AltClickDuration)
{
ClickCanceled?.Invoke(this, new SimpleInteractionEventArgs(contact));
AltClickComplete?.Invoke(this, new SimpleInteractionEventArgs(contact));
}
else
{
ClickComplete?.Invoke(this, new SimpleInteractionEventArgs(contact));
}
_potentialClick = true;
}
}
else if (_activeTouches.Count >= 2)
{
UpdateMultitouch();
}
}
private void StartTouch(TouchState touch)
{
var index = IndexOfTouch(touch);
if (index >= 0)
{
MoveTouch(touch);
return;
}
_activeTouches.Add(touch);
if (_activeTouches.Count == 1)
{
ProbablyClick?.Invoke(this, new SimpleInteractionEventArgs(_environment.Raycast(touch.ScreenPosition)));
_potentialClick = true;
}
else if (_activeTouches.Count == 2)
{
if (_potentialClick)
{
ClickCanceled?.Invoke(this, new SimpleInteractionEventArgs(_environment.Raycast(_activeTouches[0].ScreenPosition)));
_potentialClick = false;
}
UpdateMultitouch();
}
}
private void MoveTouch(TouchState touch)
{
var index = IndexOfTouch(touch);
if (index < 0)
{
return;
}
if (_activeTouches.Count == 1)
{
var dist = touch.ScreenPosition - _activeTouches[index].ScreenPosition;
var contact = _environment.Raycast(touch.ScreenPosition);
if (_potentialClick)
{
if (dist.LengthSquared < ClickThresholdSquared)
{
return;
}
_potentialClick = false;
ClickCanceled?.Invoke(this, new SimpleInteractionEventArgs(contact));
}
Pan?.Invoke(this, new PanInteractionEventArgs(Move(contact, _activeTouches[index].ScreenPosition), contact));
}
else if (_activeTouches.Count >= 2)
{
var center = _multitouchCenter;
var dist = _panningDistance;
var angle = _panningAngle;
CalculatePanning(out center, out dist, ref angle);
if (center != _multitouchCenter)
{
var oldContact = _environment.Raycast(_multitouchCenter);
var newContact = _environment.Raycast(center);
Pan?.Invoke(this, new PanInteractionEventArgs(oldContact, newContact));
_multitouchCenter = center;
}
if (angle != _panningAngle)
{
var oldContact = _environment.Raycast(_multitouchCenter);
Rotate?.Invoke(this, new RotateInteractionEventArgs(oldContact, angle - _panningAngle));
_panningAngle = angle;
}
if (dist != _panningDistance)
{
var oldContact = _environment.Raycast(_multitouchCenter);
Zoom?.Invoke(this, new ZoomInteractionEventArgs(oldContact, dist - _panningDistance));
_panningDistance = dist;
}
}
_activeTouches[index].Update(touch);
}