bionic (3) al_draw_filled_polygon_with_holes.3alleg5.gz

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

       All hole vertices must use the opposite order (clockwise with y down) of the polygon vertices.  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)