allegro.cc

Manual

Transformations

• ALLEGRO_TRANSFORM
• al_copy_transform
• al_use_transform
• al_get_current_transform
• al_invert_transform
• al_check_inverse
• al_identity_transform
• al_build_transform
• al_translate_transform
• al_rotate_transform
• al_scale_transform
• al_transform_coordinates
• al_compose_transform

al_invert_transform

void al_invert_transform(ALLEGRO_TRANSFORM *trans)

Inverts the passed transformation. If the transformation is nearly singular (close to not having an inverse) then the returned transformation may be invalid. Use al_check_inverse to ascertain if the transformation has an inverse before inverting it if you are in doubt.

Parameters:

• trans - Transformation to invert

See also: al_check_inverse

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