round_cap
m_polyline.line_cap(round_cap);
if(m_line_cap != round_cap)
void round_cap(bool v) { m_round_cap = v; }
bool round_cap() const { return m_round_cap; }
stroke->line_cap(agg::round_cap);
case agg::round_cap:
property->AddOption(agg::round_cap, "Round");
return agg::round_cap;