/**
 * 遮罩
 */
L.Mask = L.Polygon.extend({
    options: {
        isRect: true,    //是否為矩形遮罩,如果為是,則使用northWest，northEast，sourthEast，sourthWest創(chuàng)建矩形遮罩層外邊界,如果為false，則使用傳入的坐標數(shù)組作為遮罩層外邊界
        northWest: { lat: 180.0, lng: -180.0 },  //遮罩層西北角坐標
        northEast: { lat: 180.0, lng: 180.0 },  //遮罩層東北角坐標
        sourthEast: { lat: -180.0, lng: 180.0 }, //遮罩層東南角
        sourthWest: { lat: -180.0, lng: -180.0 }, //遮罩層西南角
        maskBoundary: null,    //遮罩層邊界坐標
        showPolygons: []    //顯示區(qū)域
    },
    initialize(options) {
        L.Util.setOptions(this, options);
        let latlngs = this.getMaskLatLngs();
        this._setLatLngs(latlngs);
    },
    /**
     * 畫遮蔽層的相關方法
            *思路: 創(chuàng)建一個矩形作為遮罩層,構(gòu)造函數(shù)傳入的坐標作為內(nèi)環(huán)
     * @see https://blog.csdn.net/mapmonster/article/details/104455516
     * 
     * @param {*} latlngs 
     */
    getMaskLatLngs() {
        let latlngs = [];
        //是矩形遮罩,則使用northWest，northEast，sourthEast，sourthWest創(chuàng)建矩形遮罩層外邊界
        if (this.options.isRect) {
            this.options.maskBoundary = [];
            this.options.maskBoundary.push(this.options.northWest);
            this.options.maskBoundary.push(this.options.sourthWest);
            this.options.maskBoundary.push(this.options.sourthEast);
            this.options.maskBoundary.push(this.options.northEast);
            this.options.maskBoundary.push(this.options.northWest);
        }
        latlngs.push(this.options.maskBoundary);
        for (let i = 0; i < this.options.showPolygons.length; i++) {
            latlngs = latlngs.concat(this.options.showPolygons[i].getLatLngs());
        }
        return latlngs;
    }
});
/**
 * 合乎leaflet語法
 * @param {*} options 
 * @returns 
 */
L.mask = function (latlngs, options) {
    return new L.Mask(latlngs, options);
};

package com.yelang.project.extend.earthquake.controller;
import java.util.List;
import org.apache.shiro.authz.annotation.RequiresPermissions;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.yelang.framework.web.controller.BaseController;
import com.yelang.framework.web.domain.AjaxResult;
import com.yelang.framework.web.page.TableDataInfo;
import com.yelang.project.extend.earthquake.domain.EarthQuakeProvinceStatVO;
import com.yelang.project.extend.earthquake.domain.EarthquakeInfo;
import com.yelang.project.extend.earthquake.domain.Province;
import com.yelang.project.extend.earthquake.service.IEarthquakeInfoService;
import com.yelang.project.extend.earthquake.service.IProvinceService;
@Controller
@RequestMapping("/eq/province")
public class ProvinceController extends BaseController{
	private String prefix = "earthquake/province";
	@Autowired
	private IProvinceService provinceService;
	@Autowired
	private IEarthquakeInfoService earthQuakeInfoService;
	@RequiresPermissions("eq:province:view")
    @GetMapping()
    public String map(){
        return prefix + "/map";
    }
    @RequiresPermissions("eq:province:list")
    @PostMapping("/list")
    @ResponseBody
    public TableDataInfo list(Province province){
        startPage();
        List<Province> list = provinceService.selectList(province);
        return getDataTable(list);
    }
    @RequiresPermissions("eq:province:geom")
    @GetMapping("/geojson/{id}")
    @ResponseBody
    public AjaxResult getGeojson(@PathVariable("id") Long id){
    	Province province = provinceService.findGeoJsonById(id, null);
        return AjaxResult.success().put("data", province.getGeomJson());
    }
}

package com.yelang.project.extend.earthquake.mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.yelang.project.extend.earthquake.domain.Province;
/**
 * 省級行政區(qū)劃數(shù)據(jù)接口
 * @author wuzuhu
 *
 */
public interface ProvinceMapper extends BaseMapper<Province>{
	static final String FIND_GEOJSON_SQL="<script>"
			+ "select st_asgeojson(geom) as geomJson from biz_province "
			+ "where id = #{id} "
			+ "<if test='null != name'>and name like concat('%', #{name}, '%')</if>"
			+ "</script>";
	@Select(FIND_GEOJSON_SQL)
	Province findGeoJsonById(@Param("id")Long id,@Param("name")String name);
}

function initSidebar(){//初始化sidebar頁面
	var sidebar = L.control.sidebar('sidebar', {position: 'right'}).addTo(mymap);
	//默認sidebar打開，并展示一個tab頁
	sidebar.open();
	$("#xz_info").addClass("active");
	$("#home").addClass("active");
	//初始化行政區(qū)劃表格
	initHnTownTable();
}
function initHnTownTable(){
	   var options = {
	       url: prefix + "/list",
	       createUrl: prefix + "/add",
	       updateUrl: prefix + "/edit/{id}",
	       modalName: "鄉(xiāng)鎮(zhèn)行政區(qū)劃",
	       columns: [{
	            checkbox: true
	       },
	       {
	            field: 'id',
	            title: '',
	            visible: false
	       },
	       {
	           field: 'name',
	            title: '省份'
	       },
	       {
	          field: 'type',
	          title: '類別'
	       },
	       {
	           title: '操作',
	           align: 'center',
	           formatter: function(value, row, index) {
	              var actions = [];
	              actions.push('<a class="btn btn-success btn-xs ' + removeFlag + '" href="javascript:void(0)" rel="external nofollow"  onclick="previewTown(\'' + row.id + '\',\''+row.name+'\')"><i class="fa fa-paper-plane"></i>定位</a>');
	                 return actions.join('');
	            }
	          }]
	       };
	   $.table.init(options);
}

function previewTown(gid,name){
	var myStyle = {color:"white",weight:5,"opacity":1};
	$.ajax({  
		  type:"get",  
		  url:prefix + "/geojson/" + gid,  
		  data:{},  
		  dataType:"json",  
		  cache:false,
		  processData:false,
		  success:function(result){
		        if(result.code == web_status.SUCCESS){
		        	var geojson = JSON.parse(result.data);
		        	var areaLayer = L.geoJSON(geojson,{style:myStyle}).addTo(mymap);
		        	showLayerGroup.clearLayers();
		        	showLayerGroup.addLayer(areaLayer);
		        	mymap.setView(areaLayer.getBounds().getCenter(),8);
		        	showMask(geojson);
		        }
		   },
		  error:function(){
		      $.modal.alertWarning("獲取空間信息失敗");
		  }
	});
}

function showMask(geojson){
	 var showPolygons = [];
     var pArray = [];
     for (var i = 0; i < geojson.coordinates.length; i++) {
    	   var points = [];
    	   $.each(geojson.coordinates[i],function(k,v){
    	          points.push({lat:v[1],lng:v[0]});
    	   });
    	   //將閉合區(qū)域加到遮蔽層上，每次添加完后要再加一次西北角作為下次添加的起點和最后一次的終點
    	    pArray = pArray.concat(points);
    	    pArray.push(pArray[0]);
    	 }
    	 var polygon = L.polygon(pArray, { color: 'green' });
    	 showPolygons.push(polygon);
	     var mask = L.mask({
	         showPolygons: showPolygons,
	         color: '#C0C0C0',
	         fillOpacity: 1,
	         renderer: L.canvas({ padding: 1 })  //解決遮罩層拖拽與縮放顯示不全的Bug
	     });
	     showLayerGroup.addLayer(mask);
	}