Re: How do I get the height of a character?

2005-09-18 Thread J.Pietschmann

Manuel Mall wrote:
The font class provides a width method to determine the width of a 
character but how do I figure out the height of a character?


IIRC the height of an individual character doesn't matter. Well,
for the possible exceptions of characters leaking outside the font
boxes, like uppercase umlauts and many other accented characters.
For all other cases, only the font height measurements should matter,

For leader-style=dots everything is basically user agent 
defined. Fop uses the dot character from the current font which is a 
sensible selection IMO. 


I think there is a difference between leaders using the dot character
(for the foo...page 19 style) and a leader which is a dotted line
(rule-style=dotted). THe rule-thickness only applies to the second
leader style.

J.Pietschmann


Re: How do I get the height of a character?

2005-09-18 Thread Manuel Mall
On Sun, 18 Sep 2005 05:30 pm, J.Pietschmann wrote:
 Manuel Mall wrote:
  The font class provides a width method to determine the width of a
  character but how do I figure out the height of a character?

 IIRC the height of an individual character doesn't matter. Well,
 for the possible exceptions of characters leaking outside the font
 boxes, like uppercase umlauts and many other accented characters.
 For all other cases, only the font height measurements should matter,

  For leader-style=dots everything is basically user agent
  defined. Fop uses the dot character from the current font which is
  a sensible selection IMO.

 I think there is a difference between leaders using the dot character
 (for the foo...page 19 style) and a leader which is a dotted line
 (rule-style=dotted). THe rule-thickness only applies to the second
 leader style.

Not so sure here - I think the rule-thickness property applies only to 
leader-style=rule however according my understanding of 6.6.9 Trait 
Derivation the rule-thickness trait applies always unless 
leader-style=use-content. Therefore the question arises what is the 
appropriate value for the rule-thickness trait for leader-style=dots. 
My understanding is that this would be user agent specific as are most 
properties with respect to leader-style=dots, e.g. the size of the 
dots. IMO using the font-size gives a far too big rule-thickness for 
the dots. Therefore I was thinking of using the actual vertical size of 
the black part of the dot character. It appears that this information 
is not readily available. So I decided to make it square, i.e. use the 
character width as rule-thickness. This seems to give reasonable 
results (as long as the dot glyphs of the selected font are square or 
round as well). BTW, this only becomes relevant if someone wants to 
paint a background or padding or border around the leader or chooses a 
bigger font-size for the leader than for the rest of the line as in 
that case the rule-thickness may determine the overall height of the 
line. All of that are not very common scenarios I would think, so its 
really just tidying up a very small and not important loose end.
 J.Pietschmann
Manuel