Scaled font print call?

Scaled font print call?

TrippleG93

Member #16,156

January 2016

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

Mark Oates

Member #1,146

March 2001

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.

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TrippleG93

Member #16,156

January 2016

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

Chris Katko

Member #1,881

January 2002

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.

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