How to create a zoom-extents ViewPort?

[nzain]

I'm trying to modify the active view port stored in my generated DXF file. Lets say I have a drawing with some minX, minY, maxX, maxY values. I can calculate a center and store as ActiveViewPort.ViewCenter (works). However, how can I modify width and/or height of the visible area? If you think about this, window size and aspect ratio come into play. But certainly it is always possible to zoom such that the given bounding box is fully visible (usually called zoom-extents). I don't need a perfect solution, but right now some of my drawings open "empty" because the viewport is too small. That's quite bad.

I've tried to set ActiveViewPort.ViewHeight without success, but the property documentation says "max drawing version R2004" (?).

Issue #24 lists the {{VIEWPORT}} as not done, yet. @brettfo do you think something crucial is missing?