Scaled font print call?

no-reply@allegro.cc (TrippleG93) — Thu, 21 Jan 2016 21:32:37 +0000

The game that I am trying to create scales all my images to fit the middle of the screen. Thus if the game is 640 by 480 it will scale it on a computer screen that is 1080 * 720 and so forth.

When I print a scaled bitmap the coordinates change to negative coordinate (I don't know why but I have adjusted to that)

The problem I am running into is that for bitmaps there is a function call called
- al_draw_scaled_bitmap()
But for fonts I don't know if there exist such a function call and if not how do I scale it so that it prints on the right coordinate for the screen.

Here is an example
- al_draw_scaled_bitmap(mapImagePlain, -row * 32, -column * 24, screenWidth, screenHeight, scaleX, scaleY, scaleW, scaleH, 0);

where the xPosition and yPosition are both negative but for this call:

- al_draw_text(font, al_map_rgb(red, green, blue), xPosition, yPosition, NULL, text);

where the xPosition and yPosition are positive and its coordinates deals with the actual screen size

If anyone knows a solution or has advice it would be much appreciated thank you

no-reply@allegro.cc (Mark Oates) — Thu, 21 Jan 2016 23:50:50 +0000

Yes, there are no functions to scale fonts.

The current way to draw a scaled font is to draw your text to a separate ALLEGRO_BITMAP. Then, draw a scaled bitmap.

It might be something like this:

#SelectExpand
  1ALLEGRO_BITMAP *create_text_render(ALLEGRO_FONT *font, ALLEGRO_COLOR color, const char *text)
  2{
  3   ALLEGRO_STATE previous_state;
  4   al_store_state(&previous_state, ALLEGRO_STATE_TARGET_BITMAP);
  5
  6   int bitmap_w = al_get_text_width(font, text);
  7   int bitmap_h = al_get_font_line_height(font);
  8   ALLEGRO_BITMAP *text_render = al_create_bitmap(bitmap_w, bitmap_h);
  9
 10   al_set_target_bitmap(text_render);
 11   al_clear_to_color(al_map_rgba_f(0.0, 0.0, 0.0, 0.0));
 12
 13   al_draw_text(font, color, 0, 0, NULL, text);
 14
 15   al_restore_state(&previous_state);
 16   return text_render;
 17}

^ This is not tested; there may be typos. Here's how it's done in AllegroFlare.

no-reply@allegro.cc (TrippleG93) — Fri, 22 Jan 2016 02:19:13 +0000

Thank You! I'll give that a try and I'll let you know how that goes.

no-reply@allegro.cc (Chris Katko) — Mon, 25 Jan 2016 01:28:41 +0000

If the fonts are TTF, can't you just increase the font point size?

Scaling small text to HD is going to be very ugly.