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import {rgb as colorRgb} from "d3-color";
import basis from "./basis.js";
import basisClosed from "./basisClosed.js";
import nogamma, {gamma} from "./color.js";
export default (function rgbGamma(y) {
var color = gamma(y);
function rgb(start, end) {
var r = color((start = colorRgb(start)).r, (end = colorRgb(end)).r),
g = color(start.g, end.g),
b = color(start.b, end.b),
opacity = nogamma(start.opacity, end.opacity);
return function(t) {
start.r = r(t);
start.g = g(t);
start.b = b(t);
start.opacity = opacity(t);
return start + "";
};
}
rgb.gamma = rgbGamma;
return rgb;
})(1);
function rgbSpline(spline) {
return function(colors) {
var n = colors.length,
r = new Array(n),
g = new Array(n),
b = new Array(n),
i, color;
for (i = 0; i < n; ++i) {
color = colorRgb(colors[i]);
r[i] = color.r || 0;
g[i] = color.g || 0;
b[i] = color.b || 0;
}
r = spline(r);
g = spline(g);
b = spline(b);
color.opacity = 1;
return function(t) {
color.r = r(t);
color.g = g(t);
color.b = b(t);
return color + "";
};
};
}
export var rgbBasis = rgbSpline(basis);
export var rgbBasisClosed = rgbSpline(basisClosed);