import 'dart:ui';
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import 'package:flutter_baidu_mapapi_base/flutter_baidu_mapapi_base.dart';
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import 'package:flutter_baidu_mapapi_utils/flutter_baidu_mapapi_utils.dart';
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import 'package:flutter_baidu_mapapi_map/flutter_baidu_mapapi_map.dart';
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import 'package:locations/model/map/map_model.dart';
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class MapUtil {
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///画线
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///https://lbs.baidu.com/index.php?title=flutter/loc/render-map/ployline
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///https://mapopen-pub-androidsdk.bj.bcebos.com/map/flutter/docs/utils_api_1.2/flutter_baidu_mapapi_utils/flutter_baidu_mapapi_utils-library.html
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static drawLine(List<BMFCoordinate> points, Color lineColor,
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BMFMapController? _mapController,
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{int width = 16}) {
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List<Color> colors = [lineColor];
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List<int> indexs = List.filled(points.length - 1, 0);
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/// 创建polyline
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BMFPolyline colorsPolyline = BMFPolyline(
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coordinates: points,
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indexs: indexs,
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colors: colors,
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width: width,
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dottedLine: false,
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lineDashType: BMFLineDashType.LineDashTypeNone,
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lineCapType: BMFLineCapType.LineCapRound,
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lineJoinType: BMFLineJoinType.LineJoinRound);
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_mapController?.addPolyline(colorsPolyline);
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}
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//获取地图的显示参数
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static Future<MapShowInfo> getMapShowParams(
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List<BMFCoordinate> points) async {
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List<double?> outSides = _getOutSidePoint(points);
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BMFCoordinate center = BMFCoordinate(
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(outSides[0]! + outSides[1]!) / 2, (outSides[2]! + outSides[3]!) / 2);
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//留1/20的边界
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int zoom =
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await _getZoom(outSides[0], outSides[1], outSides[2], outSides[3]);
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return MapShowInfo(center, zoom);
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}
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//
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///获取地图的中心点
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static List<double?> _getOutSidePoint(List<BMFCoordinate> points) {
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double? maxLat = points[0].latitude;
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double? minLat = points[0].latitude;
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double? maxLng = points[0].longitude;
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double? minLng = points[0].longitude;
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//获取东南西北四个点
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points.forEach((element) {
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if (maxLat! < element.latitude) {
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maxLat = element.latitude;
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}
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if (minLat! > element.latitude) {
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minLat = element.latitude;
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}
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if (maxLng! < element.longitude) {
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maxLng = element.longitude;
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}
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if (minLng! > element.longitude) {
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minLng = element.longitude;
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}
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});
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return [maxLat, minLat, maxLng, minLng];
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}
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static Future<int> _getZoom(
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double? maxLat, double? minLat, double? maxLng, double? minLng) async {
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List<double> zoom = [
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50,
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100,
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200,
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500,
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1000,
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2000,
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5000,
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10000,
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20000,
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25000,
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50000,
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100000,
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200000,
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500000,
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1000000,
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2000000
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]; //级别18到3。
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var pointA = BMFCoordinate(maxLat!, maxLng!); // 创建点坐标A
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var pointB = BMFCoordinate(minLat!, minLng!); // 创建点坐标B
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//留1/20的边界
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double? distance =
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await BMFCalculateUtils.getLocationDistance(pointA, pointB);
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distance = distance! / 10 + distance;
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for (var i = 0, zoomLen = zoom.length; i < zoomLen; i++) {
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if (zoom[i] - distance > 0) {
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return 18 - i + 3; //之所以会多3，是因为地图范围常常是比例尺距离的10倍以上。所以级别会增加3。
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}
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}
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return 18;
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}
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static Future<BMFMarker> addMarker(
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BMFMapController? _mapController, BMFCoordinate position, String icon,
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{String identifier = "flutter_marker",int zIndex=0,BMFPoint? offset}) async {
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BMFMarker marker =
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BMFMarker(position: position, identifier: identifier, icon: icon,zIndex: zIndex,centerOffset: offset);
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/// 添加Marker
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await _mapController?.addMarker(marker);
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return marker;
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}
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static removeMarker(BMFMapController? _mapController, BMFMarker marker) {
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_mapController!.removeMarker(marker);
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}
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static removeMarkers(BMFMapController? _mapController, List<BMFMarker> markers) {
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_mapController!.removeMarkers(markers);
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}
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static cleanAllMarkers(BMFMapController? _mapController) {
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_mapController!.cleanAllMarkers();
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}
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}
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