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Can I Draw Scaled Text?
chanochambure
Member #15,725
September 2014
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Hi everybody,

There is a way to draw scaled text in both axes?

For TTF, i can resize the textsize with size parameter; but on Bitmap Font, i'm trying to resize the loaded bitmap to make my font smallest but al_grab_font_from_bitmap return me False.

I think when my bitmap was resized, i lost the bounding box line.

???

Anyone have any idea to make it work? or give me another solution to "scaled text"???

dthompson
Member #5,749
April 2005
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Scaling your bitmap font before passing it to al_grab_font_from_bitmap won't work. This function requires pixel-perfect precision from the passed bitmap; scaling it beforehand will do weird things with the gaps between the characters. If you've enabled texture smoothing, the gaps will actually become blurred - meaning you have absolutely no chance :P

The best way of dealing with this would be to load your bitmap font normally, then use transformations to scale the result of al_draw_text.

For example, to scale your text to twice the size:

ALLEGRO_TRANSFORM tr;
al_identity_transform(&tr);
al_scale_transform(&tr, 2, 2);
al_use_transform(&tr);

al_draw_text(font, al_map_rgb_f(1,1,1), 0, 0, 0, "t h i c c");

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chanochambure
Member #15,725
September 2014
avatar

Thanks dthompson, i'm using doing a transform in scale and position. And after drawing setting identity transform.

Thanks for the tip! :o

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