AreaRestriction.min.js

var BMapLib=window.BMapLib=BMapLib||{};(function(){var AreaRestriction=BMapLib.AreaRestriction=function(){};var _isRestricted=false;var _map=null;var _bounds=null;AreaRestriction.setBounds=function(map,bounds){if(!map||!bounds||!(bounds instanceof BMap.Bounds)){throw"请检查传入参数值的合法性";return false}if(_isRestricted){this.clearBounds()}_map=map;_bounds=bounds;_map.addEventListener("moveend",this._mapMoveendEvent);_isRestricted=true;return true};AreaRestriction._mapMoveendEvent=function(e){if(_bounds.containsBounds(_map.getBounds())){return}var curBounds=_map.getBounds(),curBoundsSW=curBounds.getSouthWest(),curBoundsNE=curBounds.getNorthEast(),_boundsSW=_bounds.getSouthWest(),_boundsNE=_bounds.getNorthEast();var boundary={n:0,e:0,s:0,w:0};boundary.n=(curBoundsNE.lat<_boundsNE.lat)?curBoundsNE.lat:_boundsNE.lat;boundary.e=(curBoundsNE.lng<_boundsNE.lng)?curBoundsNE.lng:_boundsNE.lng;boundary.s=(curBoundsSW.lat<_boundsSW.lat)?_boundsSW.lat:curBoundsSW.lat;boundary.w=(curBoundsSW.lng<_boundsSW.lng)?_boundsSW.lng:curBoundsSW.lng;var center=new BMap.Point(boundary.w+(boundary.e-boundary.w)/2,boundary.s+(boundary.n-boundary.s)/2);if(this.tempCenter&&this.tempCenter.lng===center.lng&&this.tempCenter.lat===center.lat){return}else{this.tempCenter={};this.tempCenter.lng=center.lng;this.tempCenter.lat=center.lat}setTimeout(function(){_map.panTo(center,{noAnimation:"no"})},1)};AreaRestriction.clearBounds=function(){if(!_isRestricted){return}_map.removeEventListener("moveend",this._mapMoveendEvent);_isRestricted=false}})();