[vtkusers] Get origin of vtkAxis in screen coordinates?

[Elvis Stansvik]

Hi all,

I've been banging my head on this problem for a while: I need to get the
origin of a vtkAxis in X/Y screen coordinates, in order to position another
widget to line up with the axis.

I found this snippet in vtkChartXY's own internal UpdateLayout function:

    // Get the screen coordinates for the origin, and move the axes there.
    vtkVector2f origin(0.0);
    vtkTransform2D* transform =
this->ChartPrivate->PlotCorners[0]->GetTransform();
    transform->TransformPoints(origin.GetData(), origin.GetData(), 1);

But I don't have access to those transforms, and can't see a way to get at
them :/

What would be the best way to get the screen coordinates of a vtkAxis
origin? Or actually, what I really want is the bottom left corner of the
plot area, which in my case corresponds to the axis origin.

Thanks in advance,
Elvis
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