void queue_draw_for (std::list<PortMatrixNode> const &);
void draw_association_indicator (cairo_t *, uint32_t, uint32_t, double p = 1);
void draw_empty_square (cairo_t *, uint32_t, uint32_t);
void queue_draw_for (std::list<PortMatrixNode> const &);
void draw_association_indicator (cairo_t *, uint32_t, uint32_t, double p = 1);
void draw_empty_square (cairo_t *, uint32_t, uint32_t);