Provided by: allegro5-doc_5.2.6.0-1_all 

NAME
al_draw_rotated_bitmap - Allegro 5 API
SYNOPSIS
#include <allegro5/allegro.h>
void al_draw_rotated_bitmap(ALLEGRO_BITMAP *bitmap,
float cx, float cy, float dx, float dy, float angle, int flags)
DESCRIPTION
Draws a rotated version of the given bitmap to the target bitmap. The bitmap is rotated by `angle' radi‐
ans clockwise.
The point at cx/cy relative to the upper left corner of the bitmap will be drawn at dx/dy and the bitmap
is rotated around this point. If cx,cy is 0,0 the bitmap will rotate around its upper left corner.
• cx - center x (relative to the bitmap)
• cy - center y (relative to the bitmap)
• dx - destination x
• dy - destination y
• angle - angle by which to rotate (radians)
• flags - same as for al_draw_bitmap(3alleg5)
Example
float w = al_get_bitmap_width(bitmap);
float h = al_get_bitmap_height(bitmap);
al_draw_rotated_bitmap(bitmap, w / 2, h / 2, x, y, ALLEGRO_PI / 2, 0);
The above code draws the bitmap centered on x/y and rotates it 90° clockwise.
See al_draw_bitmap(3alleg5) for a note on restrictions on which bitmaps can be drawn where.
SEE ALSO
al_draw_bitmap(3alleg5), al_draw_bitmap_region(3alleg5), al_draw_scaled_bitmap(3alleg5),
al_draw_scaled_rotated_bitmap(3alleg5)
Allegro reference manual al_draw_rotated_bitmap(3alleg5)