Function projectPolys

src/component/helper/MapDraw.ts:840–880

(
    rings: number[][][], // Polygons include exterior and interiors. Or polylines.
    createStream: (outStream: ProjectionStream) => ProjectionStream,
    isLine?: boolean
)

}

function projectPolys(
    rings: number[][][], // Polygons include exterior and interiors. Or polylines.
    createStream: (outStream: ProjectionStream) => ProjectionStream,
    isLine?: boolean
) {
    const polygons: number[][][] = [];
    let curPoly: number[][];

    function startPolygon() {
        curPoly = [];
    }
    function endPolygon() {
        if (curPoly.length) {
            polygons.push(curPoly);
            curPoly = [];
        }
    }
    const stream = createStream({
        polygonStart: startPolygon,
        polygonEnd: endPolygon,
        lineStart: startPolygon,
        lineEnd: endPolygon,
        point(x, y) {
            // May have NaN values from stream.
            if (isFinite(x) && isFinite(y)) {
                curPoly.push([x, y]);
            }
        },
        sphere() {}
    });
    !isLine && stream.polygonStart();
    zrUtil.each(rings, ring => {
        stream.lineStart();
        for (let i = 0; i < ring.length; i++) {
            stream.point(ring[i][0], ring[i][1]);
        }
        stream.lineEnd();
    });
    !isLine && stream.polygonEnd();
    return polygons;
}

function isGeoModel(mapOrGeoModel: MapOrGeoModel): mapOrGeoModel is GeoModel {
    return mapOrGeoModel.mainType === 'geo';