private void OnUIElementManipulationDelta(object sender, ManipulationDeltaRoutedEventArgs args)
{
double translationX = args.Cumulative.Translation.X - m_lastCapturedPoint.X;
double translationY = args.Cumulative.Translation.Y - m_lastCapturedPoint.Y;
if ((Math.Abs(translationX) > RECOGNIZE_DISTANCE) ||
(Math.Abs(translationY) > RECOGNIZE_DISTANCE))
{
//Handle the case when one coordinat is zero
if (translationX == 0f)
{
if (translationY < 0f)
{
MoveTop.Raise(this, EventArgs.Empty);
}
else if (CanRaiseEvent())
{
MoveDown.Raise(this, EventArgs.Empty);
m_lastEventTimestamp = DateTime.UtcNow;
}
m_lastCapturedPoint = args.Cumulative.Translation;
return;
}
else if (translationY == 0f)
{
if (translationX < 0f)
{
MoveLeft.Raise(this, EventArgs.Empty);
}
else if (CanRaiseEvent())
{
MoveRight.Raise(this, EventArgs.Empty);
m_lastEventTimestamp = DateTime.UtcNow;
}
m_lastCapturedPoint = args.Cumulative.Translation;
return;
}
//Handling logic for standard case
float xToY = (float)translationX / (float)translationY;
float yToX = (float)translationY / (float)translationX;
if (Math.Abs(xToY) < 0.4f)
{
if (translationY < 0f)
{
MoveTop.Raise(this, EventArgs.Empty);
}
else if (CanRaiseEvent())
{
MoveDown.Raise(this, EventArgs.Empty);
m_lastEventTimestamp = DateTime.UtcNow;
}
m_lastCapturedPoint = args.Cumulative.Translation;
return;
}
else if (Math.Abs(yToX) < 0.4f)
{
if (translationX < 0f)
{
MoveLeft.Raise(this, EventArgs.Empty);
}
else if (CanRaiseEvent())
{
MoveRight.Raise(this, EventArgs.Empty);
m_lastEventTimestamp = DateTime.UtcNow;
}
m_lastCapturedPoint = args.Cumulative.Translation;
return;
}
}
}