6、根据坐标，判断该坐标是否在地图区域范围内

最近在写配送区域相关的代码，具体需求如下：

    根据腾讯地图划分配送区域，总站下边设多个配送分站，然后将订单中的收货地址将其分配给不同的配送分站。

1、地图区域划分（腾讯地图）

    1.1、HTML

<i-col span="12">
 <!--   定义地图显示容器   -->
 <center>
    <i-button type="info" @click="initNewMap()" style="margin-left: 8px">重置地图</i-button>
 </center>
 <div id="container" style="width:100%;height:630px;border-radius:10px;margin-top:10px;">
 </div>
</i-col>

  1.2、JS

//初始化新地图
		initNewMap:function(){
            var map = new qq.maps.Map(document.getElementById("container"), {
                center: new qq.maps.LatLng(36.05562,103.88191),// 地图的中心地理坐标。
                zoom:13// 地图的中心地理坐标。
            });
            var drawingManagerOpt = new qq.maps.drawing.DrawingManager({
                drawingMode: qq.maps.drawing.OverlayType.POLYGON,
                drawingControl: true,
                drawingControlOptions: {
                    position: qq.maps.ControlPosition.TOP_CENTER,
                    drawingModes: [
                        qq.maps.drawing.OverlayType.POLYGON
                    ]
                },
                circleOptions: {
                    fillColor: new qq.maps.Color(255, 208, 70, 0.3),
                    strokeColor: new qq.maps.Color(88, 88, 88, 1),
                    strokeWeight: 3,
                    clickable: false
                }
            });
            drawingManagerOpt.setMap(map);
            var points = "";
            qq.maps.event.addListener(drawingManagerOpt, 'overlaycomplete', function(event) {
                event.overlay.getPath().forEach(function(e){
                    var lng=e.getLng();
                    var lat=e.getLat();
                    points+=lng+","+lat+"-";
                });
                points=points.substring(0, points.length-1);
                vm.getPeopleDataByPolygon(points);
            });

		},
        //初始化老的地图
        initOldMap:function(value){
            var map = new qq.maps.Map(document.getElementById("container"), {
                center: new qq.maps.LatLng(36.05562,103.88191),// 地图的中心地理坐标。
                zoom:13// 地图的中心地理坐标。
            });
            //获取旧坐标
            let data = $("#jqGrid").jqGrid('getRowData', getSelectedRow("#jqGrid"));
            var areaCoordinateArray = new Array();
            areaCoordinateArray = data.areaCoordinate.split("-");
            var path = new Array();
            for(var i=0;i<areaCoordinateArray.length;i++){
                var coarray = areaCoordinateArray[i].split(",");
                path.push(new qq.maps.LatLng(coarray[1],coarray[0]));
            }
            var polygon = new qq.maps.Polygon({
                map: map
            });
            polygon.setPath(path);
            var drawingManagerOpt = new qq.maps.drawing.DrawingManager({
                drawingMode: qq.maps.drawing.OverlayType.POLYGON,
                drawingControl: true,
                drawingControlOptions: {
                    position: qq.maps.ControlPosition.TOP_CENTER,
                    drawingModes: [
                        qq.maps.drawing.OverlayType.POLYGON
                    ]
                },
                circleOptions: {
                    fillColor: new qq.maps.Color(255, 208, 70, 0.3),
                    strokeColor: new qq.maps.Color(88, 88, 88, 1),
                    strokeWeight: 3,
                    clickable: false
                }
            });
            drawingManagerOpt.setMap(map);
            var points = "";
            qq.maps.event.addListener(drawingManagerOpt, 'overlaycomplete', function(event) {
                event.overlay.getPath().forEach(function(e){
                    var lng=e.getLng();
                    var lat=e.getLat();
                    points+=lng+","+lat+"-";
                });
                points=points.substring(0, points.length-1);
                vm.getPeopleDataByPolygon(points);
            });
        },

1.3、结果：

2、判断坐标是否在多边形区域内

/**
     * 判断是否在多边形区域内
     *
     * @param pointLon
     *            要判断的点的纵坐标
     * @param pointLat
     *            要判断的点的横坐标
     * @param lon
     *            区域各顶点的纵坐标数组
     * @param lat
     *            区域各顶点的横坐标数组
     * @return
     */
    public static boolean isInPolygon(double pointLon, double pointLat, double[] lon,
                                      double[] lat) {
        // 将要判断的横纵坐标组成一个点
        Point2D.Double point = new Point2D.Double(pointLon, pointLat);
        // 将区域各顶点的横纵坐标放到一个点集合里面
        List<Point2D.Double> pointList = new ArrayList<Point2D.Double>();
        double polygonPoint_x = 0.0, polygonPoint_y = 0.0;
        for (int i = 0; i < lon.length; i++) {
            polygonPoint_x = lon[i];
            polygonPoint_y = lat[i];
            Point2D.Double polygonPoint = new Point2D.Double(polygonPoint_x, polygonPoint_y);
            pointList.add(polygonPoint);
        }
        return check(point, pointList);
    }

    /**
     * 一个点是否在多边形内
     *
     * @param point
     *            要判断的点的横纵坐标
     * @param polygon
     *            组成的顶点坐标集合
     * @return
     */
    private static boolean check(Point2D.Double point, List<Point2D.Double> polygon) {
        java.awt.geom.GeneralPath peneralPath = new java.awt.geom.GeneralPath();

        Point2D.Double first = polygon.get(0);
        // 通过移动到指定坐标（以双精度指定），将一个点添加到路径中
        peneralPath.moveTo(first.x, first.y);
        polygon.remove(0);
        for (Point2D.Double d : polygon) {
            // 通过绘制一条从当前坐标到新指定坐标（以双精度指定）的直线，将一个点添加到路径中。
            peneralPath.lineTo(d.x, d.y);
        }
        // 将几何多边形封闭
        peneralPath.lineTo(first.x, first.y);
        peneralPath.closePath();
        // 测试指定的 Point2D 是否在 Shape 的边界内。
        return peneralPath.contains(point);
    }