-=> Quoting Peter Fitzsimmons to Phil Crown <=-



 PC> For example, how does a color syntax-highlighting editor know to print

 PC> a word in blue in the middle of the page, and print everything before

 PC> and after it in different colors (and then be able to scroll it off and

 PC> back onto the screen.



 PF> I recently had to code something like this (it was for printing,  not

 PF> for displaying -- the the issue was not colours but different fonts

 PF> (which is even worse than colours because the fonts can have a

 PF> different highest,  yet still be in the same line). 

 PF> What I had to do was loose the concept of a "line",  and
work with a

 PF> linked-list of "text runs".  A line becomes a linked-list
of runs (the

 PF> line ends when the list ends). 

 PF> Each run has a style (part of which can be colour), typeface, x

 PF> coordinate, and pel-width.  The pel-height has to be calculated by

 PF> scanning the whole run to find the tallest font. 



Thanks for the ideas.  I'll see what I can do. :-)



Phil Crown  pcrown{at}airmail.net  http://web2.airmail.net/pcrown/



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