百度地图区域范围检索调用示例

使用百度地图制作的区域多条件搜索插件

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//百度地图操作
//author:licong
function MapAPIHandler() {
    this.currentBdMap = null; //百度地图
    this.currentCenterPoint = null; //中心点坐标
    this.currentName; //中心点名称
    this.currentCenterImg; //中心点图标
    this.currentLevel; //地图级数
    this.currentDistance;
    this.flag = false;
    this.currentCircle;
    //初始化
    this.InitializeComponent = function(longitude, latitude, centerName, mapLevel) {
        this.currentLevel = mapLevel;
        this.currentName = centerName;
        this.currentCenterImg = "point.png";
        this.SetCenter(longitude, latitude, mapLevel);
        Search(this.currentDistance);
    }
 
    //传入中心点经度,纬度,地图切片级数,创建百度地图实例,并且指定中心点位置
    this.SetCenter = function(longitude, latitude, mapLevel) {
        //实例化百度地图,指定中心点
        this.currentBdMap = new BMap.Map("Map", {
            /* minZoom: mapLevel,
             maxZoom: mapLevel*/
        });
        this.currentLevel = mapLevel;
        this.currentBdMap.enableScrollWheelZoom(true);
        this.currentCenterPoint = new BMap.Point(longitude, latitude);
        this.currentBdMap.centerAndZoom(this.currentCenterPoint, mapLevel);
        this.currentDistance = this.MapDistance() /3;
        this.CreatCenter(this.currentCenterPoint, this.currentCenterImg);
    }
    this.MoveToCenter=function(){
        this.currentBdMap.panTo(this.currentCenterPoint);
    }
    //创建地图中心点标注图标
    this.CreatCenter = function(centerPoint, ico, txt) {
        var myIcon = new BMap.Icon(ico, new BMap.Size(32, 32));
        var marker2 = new BMap.Marker(this.currentCenterPoint, {
            icon: myIcon
        }); // 创建标注
        var label = new BMap.Label(this.currentName, {
            offset: new BMap.Size(20, -10)
        }); // 创建标注
        label.setStyle({
            borderColor: "#808080",
            color: "#333",
            fontSize: "12px",
            height: "20px",
            lineHeight: "20px",
            fontFamily: "微软雅黑"
        });
        marker2.setLabel(label);
        this.currentBdMap.addOverlay(marker2);
    }
 
    //根据关键字检索周边信息
    this.searchNear = function(keyWords, locationName) {
        var local = new BMap.LocalSearch(this.currentBdMap, {
            renderOptions: {
                map: this.currentBdMap
            }
        });
        local.searchNearby(keyWords, locationName);
    }
 
    //根据关键字检索周边信息
    this.SearchNewrDistance = function(keyWords, distance) {
        this.currentDistance = distance;
        var local = new BMap.LocalSearch(this.currentBdMap, {
            renderOptions: {
                map: this.currentBdMap,
                autoViewport: true
            }
        });
        local.searchNearby(keyWords, this.currentCenterPoint, distance);
 
        if (this.flag == false) {
            this.flag = true;
            var circle = new BMap.Circle(this.currentCenterPoint, this.currentDistance, {
                strokeColor: "#0075C7",
                strokeWeight: 1,
                fillColor: "#333",
                fillOpacity: 0.2,
                strokeOpacity: 0.8
            }); //创建圆
            this.currentBdMap.addOverlay(circle);
        }
    }
    //圆形范围关键字搜索
    this.SearchCircle = function(keyWords) {
        if (this.flag == false) {
            this.flag = true;
            this.currentCircle = new BMap.Circle(this.currentCenterPoint, this.currentDistance, {
                strokeColor: "#0075C7",
                strokeWeight: 1,
                fillColor: "blue",
                fillOpacity: 0.2,
                strokeOpacity:0.5
            }); //创建圆
            this.currentBdMap.addOverlay(this.currentCircle);
        }
        var locals = new BMap.LocalSearch(this.currentBdMap, {
            renderOptions: {
                map: this.currentBdMap,
                autoViewport: false
            }
        });
        var bounds = getSquareBounds(this.currentCircle.getCenter(), this.currentCircle.getRadius(), this.currentBdMap);
        locals.searchInBounds(keyWords, bounds);
 
        function getSquareBounds(centerPoi, r, map) {
            var a = Math.sqrt(2) * r; //正方形边长
            mPoi = getMecator(centerPoi, map);
            var x0 = mPoi.x,
                y0 = mPoi.y;
 
            var x1 = x0 + a / 2,
                y1 = y0 + a / 2; //东北点
            var x2 = x0 - a / 2,
                y2 = y0 - a / 2; //西南点
            var ne = getPoi(new BMap.Pixel(x1, y1), map),
                sw = getPoi(new BMap.Pixel(x2, y2), map);
            return new BMap.Bounds(sw, ne);
 
        }
        //根据球面坐标获得平面坐标。
        function getMecator(poi, map) {
            return map.getMapType().getProjection().lngLatToPoint(poi);
        }
        //根据平面坐标获得球面坐标。
        function getPoi(mecator, map) {
            return map.getMapType().getProjection().pointToLngLat(mecator);
        }
    }
 
    //获取当前地图的显示范围(距离)
    this.MapDistance = function() {
        var bs = this.currentBdMap.getBounds(); //获取可视区域
        var bssw = bs.getSouthWest(); //可视区域左下角
        var bsne = bs.getNorthEast(); //可视区域右上角
        return this.GetDistance(bssw, bsne);
    }
 
    //获取两点距离
    this.GetDistance = function(pointA, pointB) {
        return this.currentBdMap.getDistance(pointA, pointB).toFixed(0);
    }
 
    //清除所有遮罩层,同时生成中心点图标
    this.ClearAll = function() {
        this.flag = false;
        this.currentBdMap.clearOverlays();
        this.CreatCenter(this.currentCenterPoint, this.currentCenterImg);
    }
}


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