private:
void paint_caps(QPainter &p, QLineF *const lines,
vector< pair<int64_t, bool> > &edges,
bool level, double samples_per_pixel, double pixels_offset,
float x_offset, float y_offset);
private:
void paint_caps(QPainter &p, QLineF *const lines,
vector< pair<int64_t, bool> > &edges,
bool level, double samples_per_pixel, double pixels_offset,
float x_offset, float y_offset);