1al_compose_transform(3)    Library Functions Manual    al_compose_transform(3)
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NAME

6       al_compose_transform
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SYNOPSIS

9              #include <allegro5/allegro.h>
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11              void al_compose_transform(ALLEGRO_TRANSFORM *trans, const ALLEGRO_TRANSFORM *other)
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DESCRIPTION

14       Compose (combine) two transformations by a matrix multiplication.
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16              trans := trans other
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18       Note that the order of matrix multiplications is important.  The effect
19       of applying the combined transform will be as if first  applying  trans
20       and then applying other and not the other way around.
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22       Parameters:
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24       · trans - Transformation to alter
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26       · other - Transformation used to transform trans
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30Allegro reference manual                               al_compose_transform(3)