Re: [DirectPython] Calculating Text Sizes

[Heikki S. <ho...@gm...>]

> -----Original Message-----
> From: David [mailto:dp...@sh...] 
> Sent: 29. elokuuta 2007 18:36
> To: ho...@gm...
> Subject: Re: [DirectPython] Calculating Text Sizes
> 
> Thanks for the reply,
> 
> I actually already figured out about the height being the same.
> And I have make a function to guess the number of lines by 
> adding a word at a time until it is too big, at that point it 
> assumes that the DrawTexts function would have wrapped it.
> My problem is that the width of the text that it is returning 
> is larger then it really is, one of the lines says it is 1050 
> px, and DrawTexts fits it into one line, and my resolution is 
> 1024 x 768 so the text width must be <= 1024.
> 
> I've also check that I am using the same font, and I am.
> 
> Any thing about why it is doing this would be great.
> 
> Thanks,
> 
> David Mack
> 

After some investigation I noticed that the COM-object responsible for the
rendering ignores spaces (and probably some other whitespace too) when it
renders the text. They are rendered, but they don't increase the width of
the string. The getTextSize() uses normal Windows API and it does count
whitespace, so there is some difference between the results. So the more you
have whitespace in the string, the more the results will differ. There
really is no fix for this because I can't modify the underlying COM-object.
Fortunately the "do it yourself" method (EditBox etc.) is not affected by
this, so if you implement a similar solution it should work OK. You can also
count the whitespace in the string and make an educated guess about how much
you should tweak the resulting width in order to get better results.

--
Heikki Salo