how do you divide an output in two lines using textprintf_ex.
I tried something like this :
textprintf_ex(window_bitmap,font,0,0,makecol(0,0,0),-1," testline 1 \n testline 2);
but that just gave me testline 1 ^ testline 2

Ouch.

A multi-line text_printf function would be good though.

Hehe, I'm only messing with you.

The point is, for programming you need a different way of thinking than for most other things in life. Otherwise you can bang your head against the desk for a whole day when the solution is really obvious...

  textprintf_ex(window_bitmap,font,0,0,makecol(0,0,0),-1," testline 1");
  textprintf_ex(window_bitmap,font,0,12,makecol(0,0,0),-1," testline 2");

Well, it was only Miran that suggested it.

In any case, I'd probably change that code slightly to be more like this:

#define LINE_SPACING 3
...
textprintf_ex(window_bitmap,font,0,0,makecol(0,0,0),-1," testline 1");
textprintf_ex(window_bitmap,font,0,(text_height(font) + LINE_SPACING),makecol(0,0,0),-1," testline 1");

If you're not using the default font, then change it to text_height(insert_your_font_name_here).

You can easily make your own multiline textprintf function. Just use printf to print to a buffer, parse it with ustrtok with '\n' as the delimiter and use textprintf_ex to print individual lines, incrementing y at each step. If you also know how to use text_length, you can even implement different alignment methods, and if you want something extra, you can do wordwrapping as well. That last one is a little trickier though...