Method get_start_edge

source/matplot/util/contourc.cpp:1298–1304

    }

    Edge QuadContourGenerator::get_start_edge(long quad,
                                              unsigned int level_index) const {
        if (EXISTS_ANY_CORNER(quad))
            return get_corner_start_edge(quad, level_index);
        else
            return get_quad_start_edge(quad, level_index);
    }

    void QuadContourGenerator::init_cache_grid() {
        long i, j, quad;