Function mercatorProjection

docs/app/js/sanddance-app.js:134503–134561

(project)

    return mercatorProjection(mercatorRaw).scale(961 / (0, _mathJs.tau));
};
function mercatorProjection(project) {
    var m = (0, _indexJsDefault.default)(project), center = m.center, scale = m.scale, translate = m.translate, clipExtent = m.clipExtent, x0 = null, y0, x1, y1; // clip extent
    m.scale = function(_) {
        return arguments.length ? (scale(_), reclip()) : scale();
    };
    m.translate = function(_) {
        return arguments.length ? (translate(_), reclip()) : translate();
    };
    m.center = function(_) {
        return arguments.length ? (center(_), reclip()) : center();
    };
    m.clipExtent = function(_) {
        return arguments.length ? (_ == null ? x0 = y0 = x1 = y1 = null : (x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1]), reclip()) : x0 == null ? null : [
            [
                x0,
                y0
            ],
            [
                x1,
                y1
            ]
        ];
    };
    function reclip() {
        var k = (0, _mathJs.pi) * scale(), t = m((0, _rotationJsDefault.default)(m.rotate()).invert([
            0,
            0
        ]));
        return clipExtent(x0 == null ? [
            [
                t[0] - k,
                t[1] - k
            ],
            [
                t[0] + k,
                t[1] + k
            ]
        ] : project === mercatorRaw ? [
            [
                Math.max(t[0] - k, x0),
                y0
            ],
            [
                Math.min(t[0] + k, x1),
                y1
            ]
        ] : [
            [
                x0,
                Math.max(t[1] - k, y0)
            ],
            [
                x1,
                Math.min(t[1] + k, y1)
            ]
        ]);
    }
    return reclip();