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al_draw_f...with_holes(3) Library Functions Manual al_draw_f...with_holes(3) 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 ver- tices 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 co- ordinates 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 (inclu- sive) and the hole uses vertices 4 to 6 (inclusive). SINCE 5.1.0 SEE ALSO al_draw_filled_polygon(3), al_draw_filled_polygon_with_holes(3), al_triangulate_polygon(3) Allegro reference manual al_draw_f...with_holes(3)
NAME | SYNOPSIS | DESCRIPTION | SINCE | SEE ALSO
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