vislite/lib/Mercator/index.es.js

灵活、快速、简单的数据可视化交互式跨端前端库

/*!
* Mercator of VISLite JavaScript Library v1.3.0
* git+https://github.com/oi-contrib/VISLite.git
*/
var Mercator = (function () {
    function Mercator(scale, center) {
        if (scale === void 0) { scale = 7; }
        if (center === void 0) { center = [107, 36]; }
        this.name = 'Mercator';
        var perimeter = 100 * scale * Math.PI;
        var help = perimeter / 180;
        var cx = help * center[0];
        var cy = -1 * help * center[1];
        this.use = function (λ, φ) {
            return [
                (help * λ - cx) * 0.8,
                -1 * help * φ - cy,
                0
            ];
        };
    }
    return Mercator;
}());

export { Mercator as default };