Is there a way to use a custom map in a geoplot?

[lubeskih]

I would like to use my own vector map of the Earth in a geoplot, is this possible, and if so, how?

[alandefreitas]

The geographic functions usually call geoplot(), which ensures the figure has a map in it, or creates a map otherwise by calling the world_map_110m() which returns the map points. Everything else is just calling the line plot functions to draw the map.

So if you have your own map, all you need to do is bypass these points and call plot with your own points instead. Something like:

        auto [x, y] = your_own_vector_map();
        line_handle a = ax->plot(x, y);
        a->tag("map");
        color_array land_color = {0, 0.9294, 0.9294, 0.9294};
        a->color(land_color);
        a->fill(true);
        color_array bg = {0, 0.7882, 0.7882, 0.7882};
        ax->color(bg);

        ax->x_axis().geographic(true);
        ax->x_axis().tick_label_format("%Dº%E");
        ax->x_axis().label("Longitude");
        ax->y_axis().geographic(true);
        ax->y_axis().tick_label_format("%Dº%N");
        ax->y_axis().label("Latitude");

The geolimits function will later crop unused data points from the map.

[lubeskih]

Understood. Thank you very much! :)