void SelectionRect_ManipulationDelta(object sender, Windows.UI.Xaml.Input.ManipulationDeltaRoutedEventArgs e)
{
// Get current position of selection's bounding box
var curPos = new Windows.Foundation.Point(
Windows.UI.Xaml.Controls.Canvas.GetLeft(SelectionRect),
Windows.UI.Xaml.Controls.Canvas.GetTop(SelectionRect)
);
// Compute new position, making sure that the bounding box does not go outside the InkingArea
var newPos = new Windows.Foundation.Point(
Math.Max(0, Math.Min(curPos.X + e.Delta.Translation.X, InkingArea.ActualWidth - SelectionRect.Width)),
Math.Max(0, Math.Min(curPos.Y + e.Delta.Translation.Y, InkingArea.ActualHeight - SelectionRect.Height))
);
// Compute the actual translation to pass to InkManager.MoveSelected
var translation = new Windows.Foundation.Point(
newPos.X - curPos.X,
newPos.Y - curPos.Y
);
if (Math.Abs(translation.X) > 0 || Math.Abs(translation.Y) > 0)
{
// Move the selection's bounding box
Windows.UI.Xaml.Controls.Canvas.SetLeft(SelectionRect, newPos.X);
Windows.UI.Xaml.Controls.Canvas.SetTop(SelectionRect, newPos.Y);
// Move selected ink
inkManager.MoveSelected(translation);
// Re-render everything
renderer.Clear();
renderer.AddInk(inkManager.GetStrokes());
renderer.UpdateSelection();
}
e.Handled = true;
}
