NAME

       al_draw_filled_polygon_with_holes - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro_primitives.h>

              void al_draw_filled_polygon_with_holes(const float *vertices,
                 const int *vertex_counts, ALLEGRO_COLOR color)

DESCRIPTION

       Draws a filled simple polygon with zero or more other simple polygons subtracted from it -
       the holes.  The holes cannot touch or intersect with the outline of the filled polygon.

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

       • vertex_counts  -  Number  of  vertices  for each polygon.  The number of vertices in the
         filled 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.

       • color - Color of the filled polygon

       When the y-axis is facing downwards (the usual) the filled  polygon  coordinates  must  be
       ordered  anti-clockwise.   All hole vertices must use the opposite order (clockwise with y
       down).  All hole vertices must be inside the main polygon and no hole may overlap the main
       polygon.

       For example:

              float vertices[] = {
                    0,   0, // filled polygon, upper left corner
                    0, 100, // filled polygon, lower left corner
                  100, 100, // filled polygon, lower right corner
                  100,   0, // filled polygon, upper right corner
                   10,  10, // hole, upper left
                   90,  10, // hole, upper right
                   90,  90  // hole, lower right
              };
              int vertex_counts[] = {
                 4, // number of vertices for filled polygon
                 3, // number of vertices for hole
                 0  // terminator
              };

       There are 7 vertices: four for an outer square from (0, 0) to (100, 100) in anti-clockwise
       order, and three more for an inner triangle in clockwise order.  The  outer  main  polygon
       uses vertices 0 to 3 (inclusive) and the hole uses vertices 4 to 6 (inclusive).

SINCE

       5.1.0

SEE ALSO

       al_draw_filled_polygon(3alleg5),               al_draw_filled_polygon_with_holes(3alleg5),
       al_triangulate_polygon(3alleg5)