vislite/lib/Hermite/index.es.js

灵活、快速、简单的数据可视化交互式跨端前端库

var Hermite = (function () {
    function Hermite(u) {
        if (u === void 0) { u = 0.5; }
        this.name = 'Hermite';
        this.__u = u;
    }
    Hermite.prototype.setP = function (x1, y1, x2, y2, s1, s2) {
        if (x1 < x2) {
            this.__a = x1;
            this.__b = x2;
            var p3 = this.__u * s1, p4 = this.__u * s2;
            y1 /= (x2 - x1);
            y2 /= (x2 - x1);
            this.__MR = [
                2 * y1 - 2 * y2 + p3 + p4,
                3 * y2 - 3 * y1 - 2 * p3 - p4,
                p3,
                y1
            ];
        }
        else
            throw new Error('The point x-position should be increamented!');
        return this;
    };
    Hermite.prototype.use = function (x) {
        if (this.__MR) {
            var sx = (x - this.__a) / (this.__b - this.__a), sx2 = sx * sx, sx3 = sx * sx2;
            var sResult = sx3 * this.__MR[0] + sx2 * this.__MR[1] + sx * this.__MR[2] + this.__MR[3];
            return sResult * (this.__b - this.__a);
        }
        else
            throw new Error('You shoud first set the position!');
    };
    return Hermite;
}());

export { Hermite as default };