/// <summary>
/// Occurs when a touch delta event is handled.
/// </summary>
/// <param name="e">The <see cref="OxyPlot.OxyTouchEventArgs" /> instance containing the event data.</param>
public override void Delta(OxyTouchEventArgs e)
{
base.Delta(e);
if (!this.IsPanEnabled && !this.IsZoomEnabled)
{
return;
}
var newPosition = e.Position;
var previousPosition = newPosition - e.DeltaTranslation;
var ignorePan = IsOnlyAcceptAxisPan && this.XAxis != null && this.YAxis != null;
if (!ignorePan && IsPanByTowFinger && e is XamarinOxyTouchEventArgs e2)
{
ignorePan = e2.PointerCount == 1;
}
if (!ignorePan)
{
XAxis?.Pan(previousPosition, newPosition);
YAxis?.Pan(previousPosition, newPosition);
}
var current = this.InverseTransform(newPosition.X, newPosition.Y);
XAxis?.ZoomAt(e.DeltaScale.X, current.X);
YAxis?.ZoomAt(e.DeltaScale.Y, current.Y);
this.PlotView.InvalidatePlot(false);
e.Handled = true;
}
private void OnMouseMove(object sender, MouseEventArgs e)
{
if (!IsPanning)
{
return;
}
if (IsInputValid(e.MouseDevice))
{
var position = e.GetPosition(AssociatedObject);
if (HasXModifiers())
{
XAxis?.Pan(previousPosition, position);
}
if (HasYModifiers())
{
YAxis?.Pan(previousPosition, position);
}
previousPosition = position;
DrawingView?.InvalidateDrawing();
e.Handled = true;
}
else
{
if (ReferenceEquals(e.MouseDevice.Captured, AssociatedObject))
{
AssociatedObject.ReleaseMouseCapture();
}
IsPanning = false;
}
}
