Cycling 74 » Topic: t_jgraphics_font_extents http://cycling74.com/forums/topic/t_jgraphics_font_extents/feed Tue, 18 Jun 2013 14:52:31 +0000 http://bbpress.org/?v=2.2.4 http://cycling74.com/forums/topic/t_jgraphics_font_extents/#post-53623 <![CDATA[t_jgraphics_font_extents]]> http://cycling74.com/forums/topic/t_jgraphics_font_extents/#post-53623 Mon, 29 Nov 2010 22:03:11 +0000 Peter Castine Would someone who knows care to explain how the components of the t_jgraphics_font_extents structure work together?

I’m porting some oldish QD code that uses the FontInfo data structure, which had ascent, descent, leading, and a value for the maximum width of a single character. All of which are used in my code.

The ascent and descent of t_jgraphics_font_extents are clear (hopefully). Is the height component effectively the sum of ascent+descent+leading (in which case I can calculate leading with simple arithmetic)? Or does the Cairo/JUCE/Cycling74 font model even include a notion of leading?

The max_x_advance is listed as “not valid”. Which leaves me with the question of how to determine the maximum character width in a given font. Any suggestions?

]]> http://cycling74.com/forums/topic/t_jgraphics_font_extents/#post-192802 <![CDATA[Re: t_jgraphics_font_extents]]> http://cycling74.com/forums/topic/t_jgraphics_font_extents/#post-192802 Mon, 29 Nov 2010 22:11:21 +0000 Peter Castine Sigh, should have read about cairo_font_extents_t in the Cairo documentation, which answers the first part of my question (if anyone else is interested, yes: leading = height – ascent – descent).

But leaves me wondering why max_x_advance isn’t “valid” and how to work around the invalidity.

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