[i])-5.5, chebyshev_y_to_client(chebyshev_ys[i])-5.5);
    }
    chebyshev_context.strokeStyle="#AA3311";
    chebyshev_context.stroke();
    chebyshev_context.closePath();

    // guides
    if(do_guides){
        min_d = Math.abs(chebyshev_xs[0] - chebyshev_client_to_x(client_x));
        min_i = 0;
        for(var i = 1; i < chebyshev_n; ++i){
            var di = Math.abs(chebyshev_xs[i] - chebyshev_client_to_x(client_x));
            if(di < min_d){
                min_d = di;
                min_i = i