import “../color/hcl”;
d3.interpolateHcl = d3_interpolateHcl;
function d3_interpolateHcl(a, b) {
a = d3.hcl(a); b = d3.hcl(b); var ah = a.h, ac = a.c, al = a.l, bh = b.h - ah, bc = b.c - ac, bl = b.l - al; if (isNaN(bc)) bc = 0, ac = isNaN(ac) ? b.c : ac; if (isNaN(bh)) bh = 0, ah = isNaN(ah) ? b.h : ah; else if (bh > 180) bh -= 360; else if (bh < -180) bh += 360; // shortest path return function(t) { a.h = ah + bh * t; a.c = ac + bc * t; a.l = al + bl * t; return a; };
}