private void vpRoot_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (currentDragStrategy == null)
{
var positionInfo = GetPosition3D(e);
var primitiveVisual = PrimitivesPickService.PickPrimitiveVisual(viewport3d, positionInfo.Pos2D);
if (primitiveVisual != null)
{
var primitiveData = PrimitivesPickService.GetPrimitiveData(primitiveVisual);
viewModel.SelectPrimitive(primitiveData);
primitiveData.MatchClass <NewPrimitive>(_ => currentDragStrategy = newPrimitiveDragStrategy);
primitiveData.MatchClass <SnappedPrimitive>(_ => currentDragStrategy = snappedDragStrategy);
Debug.Assert(currentDragStrategy != null);
currentDragStrategy.OnMouseDown(GetPosition3D(e), Tuple.Create(primitiveVisual, primitiveData));
vpRoot.CaptureMouse();
}
else
{
viewModel.UnselectPrimitives();
}
}
}
