Function quantize

docs/app/js/sanddance-app.js:129119–129173

()

var _linearJs = require("./linear.js");
var _initJs = require("./init.js");
function quantize() {
    var x0 = 0, x1 = 1, n = 1, domain = [
        0.5
    ], range = [
        0,
        1
    ], unknown;
    function scale(x) {
        return x != null && x <= x ? range[(0, _d3Array.bisect)(domain, x, 0, n)] : unknown;
    }
    function rescale() {
        var i = -1;
        domain = new Array(n);
        while(++i < n)domain[i] = ((i + 1) * x1 - (i - n) * x0) / (n + 1);
        return scale;
    }
    scale.domain = function(_) {
        return arguments.length ? ([x0, x1] = _, x0 = +x0, x1 = +x1, rescale()) : [
            x0,
            x1
        ];
    };
    scale.range = function(_) {
        return arguments.length ? (n = (range = Array.from(_)).length - 1, rescale()) : range.slice();
    };
    scale.invertExtent = function(y) {
        var i = range.indexOf(y);
        return i < 0 ? [
            NaN,
            NaN
        ] : i < 1 ? [
            x0,
            domain[0]
        ] : i >= n ? [
            domain[n - 1],
            x1
        ] : [
            domain[i - 1],
            domain[i]
        ];
    };
    scale.unknown = function(_) {
        return arguments.length ? (unknown = _, scale) : scale;
    };
    scale.thresholds = function() {
        return domain.slice();
    };
    scale.copy = function() {
        return quantize().domain([
            x0,
            x1
        ]).range(range).unknown(unknown);
    };
    return (0, _initJs.initRange).apply((0, _linearJs.linearish)(scale), arguments);
}
exports.default = quantize;

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