getPalettes = scheme => {
let pp, np;
if (scheme === "rdylbu") {
pp = d3.interpolateYlGnBu;
np = d3.interpolateYlOrRd;
}
else if (scheme === "rdylgn") {
pp = d3.interpolateYlGn;
np = d3.interpolateYlOrRd;
}
else if (scheme === "rdpubu") {
pp = d3.interpolatePuBu;
np = d3.interpolatePuRd;
}
else if (scheme === "rdgn") {
pp = d3.interpolateGreens;
np = d3.interpolateReds;
}
else if (scheme === "orbu") {
pp = d3.interpolateBlues;
np = d3.interpolateOranges;
}
return {pp, np};
}