谷歌地图 - 将地区划分成相等部分，并在地图上仅显示点击区域 [英] Google maps - divide region into equal parts and show ONLY clicked region on map

问题描述

这里是将地图划分成相等区域的代码示例。当点击矩形中心的标记时，如何才能在Google地图上显示特定的矩形区域？点击标记后，所有其他区域都不应该出现在地图中。

 函数初始化（）{
 var myLatlng; 
 var mapOptions; 
 
 myLatlng = new google.maps.LatLng（29.98439980，-95.34140015）; 
 
 mapOptions = {
 zoom：16，
 center：myLatlng，
 mapTypeId：google.maps.MapTypeId.ROADMAP 
}; 
 
 var map = new google.maps.Map（
 document.getElementById（map-canvas），mapOptions）; 
 
 google.maps.event.addListenerOnce（map，'idle'，function（）{
 drawRectangle（map）; 
}）; 
 
函数drawRectangle（map）{
 var bounds = map.getBounds（）; 
 var southWest = bounds.getSouthWest（）; 
 var northEast = bounds.getNorthEast（）; 
 
 var numberOfParts = 4; 
 
 var tileWidth =（northEast.lng（） -  southWest.lng（））/ numberOfParts; 
 var tileHeight =（northEast.lat（） -  southWest.lat（））/ numberOfParts; （var x = 0; x  for（var y = 0; y< numberOfParts; y ++）{
 var areaBounds = {
 north：southWest.lat（）+（tileHeight *（y + 1）），
 south：southWest.lat（）+（tileHeight * y），
 east：southWest.lng（）+（tileWidth *（x + 1）），
 west：southWest.lng（）+（tileWidth * x）
}; 
 
 var area = new google.maps.Rectangle（{
 strokeColor：'＃FF0000'，
 // strokeOpacity：0.8，
 strokeWeight：2，
 // fillColor：'＃FF0000'，
 // fillOpacity：0.35，
 map：map，
 bounds：areaBounds 
}）; 
 var centerMark = new google.maps.Marker（{
 position：area.getBounds（）。getCenter（），
 map：
 title：area.getBounds（） .getCenter（）。toUrlValue（6）
}）; 
 
 
 
 
 $ b google.maps.event.addDomListener（window，load，initialize）; 
  

我曾尝试使用地图边界代码，但它不像预期的那样工作。它只适用于我增加缩放。但是，每个地区的缩放比例可能不同。

  var bounds = new google.maps.LatLngBounds（）; 
 bounds.extend（southLatitude，eastLongitude）; 
 bounds.extend（northLatitude，westLongitude）; 
 map.fitBounds（bounds）; 
  

解决方案

您可以将每个矩形的边界添加为属性然后使用 map.fitBounds 来居中放大地图到矩形区域：

  google.maps.event.addListener（centerMark，'click'，function（evt）{
 // center and zoom the map to complete show the area 
 map.fitBounds （this.area）; 
 google.maps.event.addListenerOnce（map，'bounds_changed'，function（）{
 //将缩放级别增加一级以移除填充。 .setZoom（map.getZoom（）+ 1）; 
}）
}）; 
  

概念证明小提琴

代码段：

  function initialize（）{var myLatlng; var mapOptions; myLatlng = new google.maps.LatLng（29.98439980，-95.34140015）; mapOptions = {zoom：10，center：myLatlng，mapTypeId：google.maps.MapTypeId.ROADMAP}; var map = new google.maps.Map（document.getElementById（map-canvas），mapOptions）; google.maps.event.addListenerOnce（map，'idle'，function（）{drawRectangle（map）;}）;函数drawRectangle（map）{var bounds = map.getBounds（）; var southWest = bounds.getSouthWest（）; var northEast = bounds.getNorthEast（）; var numberOfParts = 4; var tileWidth =（northEast.lng（） -  southWest.lng（））/ numberOfParts; var tileHeight =（northEast.lat（） -  southWest.lat（））/ numberOfParts; （var x = 0; x  

  html，body，＃map-canvas {height：100％;宽度：100％; margin：0px; < script src =https：//   

Here is the code sample to divide map into equal regions. When clicking on marker at the center of a rectangle then how can i show only that particular rectangle region on google map? All other regions should NOT be in the map after clicking on marker.

function initialize() {     
var myLatlng;    
var mapOptions;

myLatlng = new google.maps.LatLng(29.98439980, -95.34140015);

    mapOptions = {
      zoom: 16,
      center: myLatlng,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    };

    var map = new google.maps.Map(
      document.getElementById("map-canvas"), mapOptions);

    google.maps.event.addListenerOnce(map, 'idle', function() {
      drawRectangle(map);
    });

    function drawRectangle(map) {
      var bounds = map.getBounds();
      var southWest = bounds.getSouthWest();
      var northEast = bounds.getNorthEast();

      var numberOfParts = 4;

      var tileWidth = (northEast.lng() - southWest.lng()) / numberOfParts;
      var tileHeight = (northEast.lat() - southWest.lat()) / numberOfParts;
      for (var x = 0; x < numberOfParts; x++) {
        for (var y = 0; y < numberOfParts; y++) {
          var areaBounds = {
            north: southWest.lat() + (tileHeight * (y+1)),
            south: southWest.lat() + (tileHeight * y),
            east: southWest.lng() + (tileWidth * (x+1)),
            west: southWest.lng() + (tileWidth * x)
          };

          var area = new google.maps.Rectangle({
            strokeColor: '#FF0000',
            //strokeOpacity: 0.8,
            strokeWeight: 2,
            //fillColor: '#FF0000',
            //fillOpacity: 0.35,
            map: map,
            bounds: areaBounds
          });
          var centerMark = new google.maps.Marker({
          position: area.getBounds().getCenter(),
          map: map,
          title: area.getBounds().getCenter().toUrlValue(6)
          });
        }
      }
    }   
  }   

google.maps.event.addDomListener(window, "load", initialize); 

I have tried using the map bounds code but it is not working as expected. it works only if i increase the zoom. But zoom may be different for each region.

var bounds = new google.maps.LatLngBounds();
    bounds.extend(southLatitude, eastLongitude);
    bounds.extend(northLatitude, westLongitude);
    map.fitBounds(bounds);

解决方案

You can add the bounds of each rectangle as a property of the center marker, then use map.fitBounds to center and zoom the map to the rectangular area:

google.maps.event.addListener(centerMark, 'click', function(evt) {
  // center and zoom the map to completely show the area
  map.fitBounds(this.area);
  google.maps.event.addListenerOnce(map, 'bounds_changed', function() {
    // increase the zoom by one level to remove the padding.
    map.setZoom(map.getZoom()+1);
  })
}); 

proof of concept fiddle

code snippet:

function initialize() {
  var myLatlng;
  var mapOptions;

  myLatlng = new google.maps.LatLng(29.98439980, -95.34140015);

  mapOptions = {
    zoom: 10,
    center: myLatlng,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };

  var map = new google.maps.Map(
    document.getElementById("map-canvas"), mapOptions);

  google.maps.event.addListenerOnce(map, 'idle', function() {
    drawRectangle(map);
  });

  function drawRectangle(map) {
    var bounds = map.getBounds();
    var southWest = bounds.getSouthWest();
    var northEast = bounds.getNorthEast();

    var numberOfParts = 4;

    var tileWidth = (northEast.lng() - southWest.lng()) / numberOfParts;
    var tileHeight = (northEast.lat() - southWest.lat()) / numberOfParts;
    for (var x = 0; x < numberOfParts; x++) {
      for (var y = 0; y < numberOfParts; y++) {
        var areaBounds = {
          north: southWest.lat() + (tileHeight * (y + 1)),
          south: southWest.lat() + (tileHeight * y),
          east: southWest.lng() + (tileWidth * (x + 1)),
          west: southWest.lng() + (tileWidth * x)
        };

        var area = new google.maps.Rectangle({
          strokeColor: '#FF0000',
          //strokeOpacity: 0.8,
          strokeWeight: 2,
          //fillColor: '#FF0000',
          //fillOpacity: 0.35,
          map: map,
          bounds: areaBounds
        });
        var centerMark = new google.maps.Marker({
          position: area.getBounds().getCenter(),
          map: map,
          area: areaBounds,
          title: area.getBounds().getCenter().toUrlValue(6)
        });
        google.maps.event.addListener(centerMark, 'click', function(evt) {
          map.fitBounds(this.area);
          google.maps.event.addListenerOnce(map, 'bounds_changed', function() {
            map.setZoom(map.getZoom() + 1);
          });

        });
      }
    }
  }
}

google.maps.event.addDomListener(window, "load", initialize);

html,
body,
#map-canvas {
  height: 100%;
  width: 100%;
  margin: 0px;
  padding: 0px
}

<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="map-canvas"></div>

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