VerticalMetrics.md "bbox ymax"

[weiweihuanghuang]

Does this mean the y value of the highest point in a font, it's not immediately clear to me what that term means?

[thundernixon]

Super belated reply, but I believe the answer is "yes."

If you'd like to find this in GlyphsApp, I've written a script to find this value (as well as the yMin):

font = Glyphs.font

# starter values
maxDescent = 0
maxAscent = 0

# find highest and lowest point in font
for glyph in font.glyphs:
  for layer in glyph.layers:
    
    # get descender of current layer
    descent = layer.bounds.origin.y
    
    # get ascender of current layer
    ascent = layer.bounds.size.height + descent  

    # if descent/ascent of current layer is greater than previous max descents/ascents, update the max descent/ascent
    if descent <= maxDescent:
      maxDescent = descent
      
    if ascent >= maxAscent:
      maxAscent = ascent
      

# print values in the Macro window ouput panel
print(maxDescent, maxAscent)

[thundernixon]

Actually, to meet the vertical metrics spec, as far as I can tell, it looks like all of this is fixed in Custom Parameters by using fixfonts.py from Google Fonts Glyphs Scripts. So, no need to use my code above.

[weiweihuanghuang]

Great news! Will close this now