#leaflet #geojson

geojson2polyline

class GeoJsonUtil{
    geojson2Leaflet(geojson , vectorConfig){
        let shapes = [];
        for(let i = 0, len = geojson.features.length; i < len; ++i){
            let feature = geojson.features[i];
            feature.id = feature.properties[vectorConfig.idField?vectorConfig.idField:'id']
            feature.name = feature.properties[vectorConfig.nameField?vectorConfig.nameField:'name']
            let geom = this._reverseLatLng(feature.geometry)
            let shape = null
            let opt = vectorConfig.style
            opt.attr = feature.properties
            opt.text = feature.name

            let c = geom.coordinates;
            if(geom.type.indexOf("Multi") !== -1){
                c = geom.coordinates[0]
            }
            if(geom.type.indexOf("Point") !== -1) { // 点类型
                opt.icon = this.L.icon({
                    iconUrl: vectorConfig.icon,
                    iconSize: vectorConfig.iconSize
                })
                shape = this.L.marker(c , opt)
            }else if(geom.type.indexOf("LineString") !== -1) { // 线类型
                shape = this.L.polyline(c, opt)
            }else if(geom.type.indexOf("Polygon") !== -1) { // 面类型
                shape = this.L.polygon(c, opt)
            }
            shapes.push(shape);
        }
        return shapes;
    }

    _reverseLatLng(geometry){
        if(geometry.type.indexOf("Point") !== -1) { // 点类型
            if(geometry.type.indexOf("Multi") !== -1){ // 2维
                for(let i1 in geometry.coordinates){
                    geometry.coordinates[i1] = geometry.coordinates[i1].reverse()
                }
            }else { //1维
                geometry.coordinates = geometry.coordinates.reverse()
            }
        }else if(geometry.type.indexOf("LineString") !== -1) { // 线类型
            if(geometry.type.indexOf("Multi") !== -1){ // 3维
                for(let i2 in geometry.coordinates){
                    for(let i1 in geometry.coordinates[i2]){
                        geometry.coordinates[i2][i1] = geometry.coordinates[i2][i1].reverse()
                    }
                }
            }else { // 2维
                for(let i1 in geometry.coordinates){
                    geometry.coordinates[i1] = geometry.coordinates[i1].reverse()
                }
            }
        }else if(geometry.type.indexOf("Polygon") !== -1) { // 面类型
            if(geometry.type.indexOf("Multi") !== -1){ // 4维
                for(let i3 in geometry.coordinates) {
                    for (let i2 in geometry.coordinates[i3]) {
                        for (let i1 in geometry.coordinates[i3][i2]) {
                            geometry.coordinates[i3][i2][i1] = geometry.coordinates[i3][i2][i1].reverse()
                        }
                    }
                }
            }else { // 3维
                for(let i2 in geometry.coordinates){
                    for(let i1 in geometry.coordinates[i2]){
                        geometry.coordinates[i2][i1] = geometry.coordinates[i2][i1].reverse()
                    }
                }
            }
        }
        return geometry;
    }
}

export default new GeoJsonUtil();

geometry2latlng

reverseLatLng(geometry){

        if(geometry.type.indexOf("Point") !== -1) { // 点类型

            if(geometry.type.indexOf("Multi") !== -1){ // 2维

                for(let i1 in geometry.coordinates){

                    geometry.coordinates[i1] = geometry.coordinates[i1].reverse()

                }

            }else { //1维

                geometry.coordinates = geometry.coordinates.reverse()

            }

        }else if(geometry.type.indexOf("LineString") !== -1) { // 线类型

            if(geometry.type.indexOf("Multi") !== -1){ // 3维

                for(let i2 in geometry.coordinates){

                    for(let i1 in geometry.coordinates[i2]){

                        geometry.coordinates[i2][i1] = geometry.coordinates[i2][i1].reverse()

                    }

                }

            }else { // 2维

                for(let i1 in geometry.coordinates){

                    geometry.coordinates[i1] = geometry.coordinates[i1].reverse()

                }

            }

        }else if(geometry.type.indexOf("Polygon") !== -1) { // 面类型

            if(geometry.type.indexOf("Multi") !== -1){ // 4维

                for(let i3 in geometry.coordinates) {

                    for (let i2 in geometry.coordinates[i3]) {

                        for (let i1 in geometry.coordinates[i3][i2]) {

                            geometry.coordinates[i3][i2][i1] = geometry.coordinates[i3][i2][i1].reverse()

                        }

                    }

                }

            }else { // 3维

                for(let i2 in geometry.coordinates){

                    for(let i1 in geometry.coordinates[i2]){

                        geometry.coordinates[i2][i1] = geometry.coordinates[i2][i1].reverse()

                    }

                }

            }

        }



        return geometry;

    }