12 float r; float g; float b; float a;
14 Colour(float _r, float _g, float _b, float _a) : r(_r), g(_g), b(_b), a(_a) {}
21 Group(unsigned _start, unsigned _end, unsigned _index, const Colour & _fill = Colour(0.8,0.8,0.8,1))
22 : m_start(_start), m_end(_end), m_index(_index), m_fill(_fill)