Fun with Mirrored Text

[mozman]

The new text2path add-on supports now the text generations flags BACKWARD and UPSDIDE_DOWN.
The implementation is simple but correct by applying a x- and/or y-scaling by -1. This shows the implementation errors for FIT and ALIGNED alignments in AutoCAD and BricsCAD. The green and yellow text are the text entities rendered by AutoCAD, the red lines show the SPLINES and POLYLINE entities created by the text2path add-on.

Mirror-X = BACKWARD:
As shown by the basic alignments, BACKWARD means mirroring along the x-axis.
The FIT alignment in AutoCAD is not correct, BACKWARD does not mean mirroring about the baseline (same for ALIGNED).

Mirror-Y = UPSIDE_DOWN:
AutoCAD renders correct, UPSIDE_DOWN is mirroring about the baseline, as shown by the basic alignments.

Mirror-X and Y:
AutoCAD has given up for FIT and ALIGNED, no mirroring applied at all.

I am not going to replicate the wrong text rendering of AutoCAD and BricsCAD as I assume that not many AutoCAD users have ever used these features and replicating the incorrect behavior would add unnecessary complexity.

I don't know if I'll adding support for vertical stacked text, but if so there will be a second part "More Fun with Stacked Text", as AutoCAD and BricsCAD fail completely in different ways when implementing FIT and ALIGNED for vertical stacked text.

PS:

cad_viewer.py renders correct:

draw_cad.py also: