mollweide.yaml

# contributors: @patriciogv @meetar
import: mollweide-points.yaml
styles:
    projection:
        mix: mollweide
    mollweide:
        mix: mollweide-points
        blend_order: 0
        shaders:
            blocks:
                position: |
                    // lat and lon are defined in mollweide-points.yaml
                    if (abs(lon) > 270.) {
                        // clip
                        position.xy = vec2(3.402823466e+38);
                    } else {
                        if (abs(lon) > 180.) {
                            // snap to horizon
                            if (lon < -180.) {
                                lon = -180.;
                            } else {
                                lon = 180.;
                            }
                        }
                        vec2 new = mollweide(deg2rad(lon), deg2rad(lat));
                        // TODO: factor out this magic number – possibly something related to the difference in coordinate systems?
                        float magic_number = 100.;
                        new = vec2(lon2x_m(new.x)*magic_number, lat2y_m(new.y)*magic_number);
                        position.xy = new;
                    }