drawing integer values...

xirb22

I want to draw my score to my display, but al_draw_text() only allows the drawing of constant pointer-to-char so it's impossible to draw something like an unsigned int score, even with itoa().

Is there a way to still do this? It's probably something real simple that I'm just overlooking xD

TIA

Arthur Kalliokoski

A couple minutes of poking around in the examples found this in ex_membmp.c.

#SelectExpand
  1static void print(ALLEGRO_FONT *myfont, char *message, int x, int y)
  2{
  3   al_draw_text(myfont, al_map_rgb(0, 0, 0), x+2, y+2, 0, message);
  4   al_draw_text(myfont, al_map_rgb(255, 255, 255), x, y, 0, message);
  5}
  6
  7 .
  8 .
  9 .
 10      print(font, message, 0, 0);
 11      sprintf(second_line, "%.1f FPS", fps);
 12      print(font, second_line, 0, al_get_font_line_height(font)+5);
 13 .
 14 .
 15 .

xirb22

I never really learned C but went straight to C++, so I am a bit confused with the C parts of this code.
I see that print() writes a shadowed text to the screen, but it still really used al_draw_text() to do it and so it still requires a *char.

I am guessing sprintf() is used to print fps into second line and so converts it into a string? If so I'll read up on sprintf() to see how it works so I can use this myself.

Thanks for the help bro

SiegeLord

How about al_draw_textf? It'll take out the middle man, allowing you to pass the format string directly to the Allegro function. Look up a printf tutorial on the Internets to figure out how to use format strings (will help with sprintf too, if you end up needing it someday).

Also... you can use std::stringstream alongside al_draw_text for a more... C++... solution.

xirb22

al_draw_textf() works perfectly!
I looked up some stuff about printf() and just using "%d" as the format works!
Thanks a lot everyone

Thread #609848. Printed from Allegro.cc