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import {interpolate, interpolateRound} from "d3-interpolate";
import {identity} from "./continuous.js";
import {initInterpolator} from "./init.js";
import {linearish} from "./linear.js";
import {loggish} from "./log.js";
import {symlogish} from "./symlog.js";
import {powish} from "./pow.js";
function transformer() {
var x0 = 0,
x1 = 1,
t0,
t1,
k10,
transform,
interpolator = identity,
clamp = false,
unknown;
function scale(x) {
return x == null || isNaN(x = +x) ? unknown : interpolator(k10 === 0 ? 0.5 : (x = (transform(x) - t0) * k10, clamp ? Math.max(0, Math.min(1, x)) : x));
}
scale.domain = function(_) {
return arguments.length ? ([x0, x1] = _, t0 = transform(x0 = +x0), t1 = transform(x1 = +x1), k10 = t0 === t1 ? 0 : 1 / (t1 - t0), scale) : [x0, x1];
};
scale.clamp = function(_) {
return arguments.length ? (clamp = !!_, scale) : clamp;
};
scale.interpolator = function(_) {
return arguments.length ? (interpolator = _, scale) : interpolator;
};
function range(interpolate) {
return function(_) {
var r0, r1;
return arguments.length ? ([r0, r1] = _, interpolator = interpolate(r0, r1), scale) : [interpolator(0), interpolator(1)];
};
}
scale.range = range(interpolate);
scale.rangeRound = range(interpolateRound);
scale.unknown = function(_) {
return arguments.length ? (unknown = _, scale) : unknown;
};
return function(t) {
transform = t, t0 = t(x0), t1 = t(x1), k10 = t0 === t1 ? 0 : 1 / (t1 - t0);
return scale;
};
}
export function copy(source, target) {
return target
.domain(source.domain())
.interpolator(source.interpolator())
.clamp(source.clamp())
.unknown(source.unknown());
}
export default function sequential() {
var scale = linearish(transformer()(identity));
scale.copy = function() {
return copy(scale, sequential());
};
return initInterpolator.apply(scale, arguments);
}
export function sequentialLog() {
var scale = loggish(transformer()).domain([1, 10]);
scale.copy = function() {
return copy(scale, sequentialLog()).base(scale.base());
};
return initInterpolator.apply(scale, arguments);
}
export function sequentialSymlog() {
var scale = symlogish(transformer());
scale.copy = function() {
return copy(scale, sequentialSymlog()).constant(scale.constant());
};
return initInterpolator.apply(scale, arguments);
}
export function sequentialPow() {
var scale = powish(transformer());
scale.copy = function() {
return copy(scale, sequentialPow()).exponent(scale.exponent());
};
return initInterpolator.apply(scale, arguments);
}
export function sequentialSqrt() {
return sequentialPow.apply(null, arguments).exponent(0.5);
}