NAME

       al_triangulate_polygon - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro_primitives.h>

              bool al_triangulate_polygon(
                 const float* vertices, size_t vertex_stride, const int* vertex_counts,
                 void (*emit_triangle)(int, int, int, void*), void* userdata)

DESCRIPTION

       Divides a simple polygon into triangles, with zero or more other simple polygons subtracted from it - the
       holes.  The holes cannot touch or intersect with the outline of  the  main  polygon.   Simple  means  the
       polygon does not have to be convex but must not be self-overlapping.

       Parameters:

       • vertices - Interleaved array of (x, y) vertex coordinates for each of the polygons, including holes.

       • vertex_stride - distance (in bytes) between successive pairs of vertices in the array.

       • vertex_counts  -  Number  of  vertices for each polygon.  The number of vertices in the main polygon is
         given by vertex_counts[0] and must be at least three.   Subsequent  elements  indicate  the  number  of
         vertices in each hole.  The array must be terminated with an element with value zero.

       • emit_triangle  -  a  function  to  be  called  for every set of three points that form a triangle.  The
         function is passed the indices of the points in vertices and userdata.

       • userdata - arbitrary data to be passed to emit_triangle.

SINCE

       5.1.0

SEE ALSO

       al_draw_filled_polygon_with_holes(3alleg5)