search

peterhinch / micropython-font-to-py

A Python 3 utility to convert fonts to Python source capable of being frozen as bytecode
MIT License
368 stars 67 forks source link

Different sized fonts on the same line do not line up properly #19

Closed ironss closed 4 years ago

ironss commented 4 years ago

The bitmaps are drawn from the top of the bitmap. This means text on the same line but with different sized fonts does not line up correctly. To line up nicely, the baseline of the fonts should line up, not the top of the font.

Of course, the original font knows the offset of the top of each bitmap from the baseline, and the generating code knows it too, as 'max_ascent'. However, this is not carried through into the generated font.py file.

A simple change (https://github.com/peterhinch/micropython-font-to-py/commit/c1085f28d1b2da4c0744180b25c141121aeeefe4) creates a new function, baseline() that returns the position of the baseline from the top of the font bitmaps.

peterhinch commented 4 years ago

This looks good and I'll push an update shortly. Please could you provide a code sample of how this should be used so I can update the docs.

peterhinch commented 4 years ago

I have pushed an update. I take it that the baseline is the offset of a notional "ruler line" relative to the top. A ruler line being analogous to the lines on ruled paper where you might write with descenders lying below the line; different fonts have the same relationship to that line.

peterhinch commented 4 years ago

OK, I found this explanation so closing this.

Thanks for your work on these issues.