Function clipLine

docs/app/js/sanddance-app.js:132938–133001

(stream)

    // intersections 2 - there were intersections, and the first and last segments
    // should be rejoined.
    function clipLine(stream) {
        var point0, c0, v0, v00, clean; // no intersections
        return {
            lineStart: function() {
                v00 = v0 = false;
                clean = 1;
            },
            point: function(lambda, phi) {
                var point1 = [
                    lambda,
                    phi
                ], point2, v = visible(lambda, phi), c = smallRadius ? v ? 0 : code1(lambda, phi) : v ? code1(lambda + (lambda < 0 ? (0, _mathJs.pi) : -(0, _mathJs.pi)), phi) : 0;
                if (!point0 && (v00 = v0 = v)) stream.lineStart();
                if (v !== v0) {
                    point2 = intersect(point0, point1);
                    if (!point2 || (0, _pointEqualJsDefault.default)(point0, point2) || (0, _pointEqualJsDefault.default)(point1, point2)) point1[2] = 1;
                }
                if (v !== v0) {
                    clean = 0;
                    if (v) {
                        // outside going in
                        stream.lineStart();
                        point2 = intersect(point1, point0);
                        stream.point(point2[0], point2[1]);
                    } else {
                        // inside going out
                        point2 = intersect(point0, point1);
                        stream.point(point2[0], point2[1], 2);
                        stream.lineEnd();
                    }
                    point0 = point2;
                } else if (notHemisphere && point0 && smallRadius ^ v) {
                    var t;
                    // If the codes for two points are different, or are both zero,
                    // and there this segment intersects with the small circle.
                    if (!(c & c0) && (t = intersect(point1, point0, true))) {
                        clean = 0;
                        if (smallRadius) {
                            stream.lineStart();
                            stream.point(t[0][0], t[0][1]);
                            stream.point(t[1][0], t[1][1]);
                            stream.lineEnd();
                        } else {
                            stream.point(t[1][0], t[1][1]);
                            stream.lineEnd();
                            stream.lineStart();
                            stream.point(t[0][0], t[0][1], 3);
                        }
                    }
                }
                if (v && (!point0 || !(0, _pointEqualJsDefault.default)(point0, point1))) stream.point(point1[0], point1[1]);
                point0 = point1, v0 = v, c0 = c;
            },
            lineEnd: function() {
                if (v0) stream.lineEnd();
                point0 = null;
            },
            // Rejoin first and last segments if there were intersections and the first