[Gambas-user] Draw.Text problem with control chars

[Doriano Blengino]

Fabien Bodard ha scritto:
> draw.text(replace(stext, "\t",string(" ",5)),x,y)
>   
Quick and simple hack, but may be he wants to make tabular columns... 
not so simple to do.

Tab widths are not always the same, it depends on the position on screen.
If using a fixed font, then replacing a tabulator with the correct 
amount of spaces (not always 5 spaces) works well.
If not using a fixed font, the previous method works not so well: the 
calculus should be done in pixels.
To print a tab, one must take the current position, divide by 8 (or 
another "tab width", or 64 pixels, or the width of 16 spaces...), take 
the integer part, add 1, and multiply again for the tab width (8, or 64, 
or the width of 16 spaces, or whatever).
In a word processor applications, tabs are at fixed positions not 
necessarily even-spaced. An array with predetermined tab positions could 
work.

Regards,

-- 
Doriano Blengino

"Listen twice before you speak.
This is why we have two ears, but only one mouth."