Method _buildGeoJSON

src/component/helper/MapDraw.ts:249–397

(
        viewCoordSys: View,
        api: ExtensionAPI,
        geo: Geo,
        mapOrGeoModel: MapOrGeoModel,
        data: SeriesData | NullUndefined,
        isVisualEncodedByVisualMap: boolean
    )

    }

    private _buildGeoJSON(
        viewCoordSys: View,
        api: ExtensionAPI,
        geo: Geo,
        mapOrGeoModel: MapOrGeoModel,
        data: SeriesData | NullUndefined,
        isVisualEncodedByVisualMap: boolean
    ): void {
        const regionsGroupByName = this._regionsGroupByName = zrUtil.createHashMap<RegionsGroup, string>();
        const regionsInfoByName = zrUtil.createHashMap<{
            dataIdx: number;
            regionModel: Model<RegionOption> | Model<MapDataItemOption>;
        }, string>();
        const regionsGroup = this._regionsGroup;
        const projection = geo.projection;
        const projectionStream = projection && projection.stream;

        const transMt = transformableGetLocalTransform(
            viewCoordSysCopyTrans(null, viewCoordSys, VIEW_COORD_SYS_TRANS_RAW)
        );

        function transformPoint(point: number[], project: GeoProjection['project']): number[] {
            if (project) {
                // projection may return null point.
                point = project(point);
            }
            return point && applyTransform([], point, transMt);
        };

        function transformPolygonPoints(inPoints: number[][]): number[][] {
            const outPoints = [];
            // If projectionStream is provided. Use it instead of single point project.
            const project = !projectionStream && projection && projection.project;
            for (let i = 0; i < inPoints.length; ++i) {
                const newPt = transformPoint(inPoints[i], project);
                newPt && outPoints.push(newPt);
            }
            return outPoints;
        }

        function getPolyShape(points: number[][]) {
            return {
                shape: {
                    points: transformPolygonPoints(points)
                }
            };
        }

        regionsGroup.removeAll();

        // Only when the resource is GeoJSON, there is `geo.regions`.
        zrUtil.each(geo.regions, function (region: GeoJSONRegion) {
            const regionName = region.name;

            // Consider in GeoJson properties.name may be duplicated, for example,
            // there is multiple region named "United Kindom" or "France" (so many
            // colonies). And it is not appropriate to merge them in geo, which
            // will make them share the same label and bring trouble in label