public VectorDouble GetPhysFromLogical(VectorInt i)
{
var v = grid.Children[0] as Image;
var s = new VectorDouble(grid.ColumnDefinitions.First().ActualWidth,
grid.RowDefinitions.First().ActualHeight);
return new VectorDouble(i.X, i.Y).Multiply(s).Add( s.Divide(new VectorDouble(2,2))) ;
}
