---
name: "al_build_transform"
section: "3alleg5"
platform: "linux"
package: "allegro5-doc"
version: "2:5.2.10.1+dfsg-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/al_build_transform/3alleg5"
---

# al\_build\_transform(3alleg5)

Allegro 5 API

## NAME

al\_build\_transform - Allegro 5 API

## SYNOPSIS

-

  ```
  #include <allegro5/allegro.h>
  void al_build_transform(ALLEGRO_TRANSFORM *trans, float x, float y,
     float sx, float sy, float theta)
  ```

## DESCRIPTION

Builds a transformation given some parameters. This call is equivalent to calling the transformations in this order: make identity, rotate, scale, translate. This method is faster, however, than actually calling those functions.

*Parameters:*

- •

  trans - Transformation to alter

- •

  x, y - Translation

- •

  sx, sy - Scale

- •

  theta - Rotation angle in radians

  *Note*: this function was previously documented to be equivalent to a different (and more useful) order of operations: identity, scale, rotate, translate.

## SEE ALSO

al\_translate\_transform(3alleg5), al\_rotate\_transform(3alleg5), al\_scale\_transform(3alleg5), al\_compose\_transform(3alleg5)