使用 fitbounds 时，在地图范围内包括打开的信息窗口 [英] Include open infowindows within bounds of map, when using fitbounds

问题描述

我有一张地图，其中包含带有信息窗口的多个标记.信息窗口需要在页面加载时打开.使用 setbounds 将地图居中以合并所有标记，这是可行的，但它还需要在边界内包含信息窗口.目前，信息窗口已被裁剪.

I have a map which contains multiple markers with infowindows. The infowindows need to be open on page load. The map is being centered using setbounds to incorporate all of the markers, which works, but it also needs to include the infowindows within the bounds. Currently the infowindows are cropped in places.

JS:

function initialize() {
    var map = new google.maps.Map(document.getElementById('map-canvas'));
    var bounds = new google.maps.LatLngBounds();
    var myLatlng1 = new google.maps.LatLng(51.525209,-0.09402479999994284)
    var contentString1 = '<div class="map-content"><p>Test1<br/ >dsfasdf<br/ >dsfasdf<br/ >dsfasdf<br/ >dsfasdf<br/ >dsfasdf<br/ >dsfasdf</p></div>'
    var infowindow1 = new google.maps.InfoWindow({content: contentString1});
    var marker1 = new google.maps.Marker({position: myLatlng1,map: map,title: 'Test1'});

    google.maps.event.addListener(marker1, 'click', function() {infowindow1.open(map,marker1);});
    infowindow1.open(map,marker1);
    bounds.extend(myLatlng1);

    var myLatlng2 = new google.maps.LatLng(51.52106840183588,-0.10866641049801729)
    var contentString2 = '<div class="map-content"><p><br/ >dsfasdf<br/ >dsfasdf<br/ >dsfasdf<br/ >dsfasdf<br/ >dsfasdf</p></div>'
    var infowindow2 = new google.maps.InfoWindow({content: contentString2});
    var marker2 = new google.maps.Marker({position: myLatlng2,map: map,title: 'Test2'});
    google.maps.event.addListener(marker2, 'click', function() {infowindow2.open(map,marker2);});
    infowindow2.open(map,marker2);
    bounds.extend(myLatlng2)

    //  Fit these bounds to the map
    map.fitBounds(bounds);
}
google.maps.event.addDomListener(window, 'load', initialize);

CSS:

#map-canvas { width: 100%; height: 520px; }

你可以在这里看到一个小提琴:http://jsfiddle.net/mKKVM/

You can see a fiddle here: http://jsfiddle.net/mKKVM/

任何人都可以建议如何在边界内获取信息窗口?

Can anyone suggest how to get the infowindows inside the bounds?

推荐答案

概念证明 jsfiddle

1. 正常显示地图
2. 计算从标记锚点到信息窗口上边缘的像素距离
3. 计算从标记锚点到信息窗口左边缘的像素距离
4. 计算从标记锚点到信息窗口右边缘的像素距离
5. 用边界右角加上信息窗口宽度的一半和边界顶部加上信息窗口高度的两点扩展原始边界.
6. 用边界左角减去信息窗口宽度的一半和边界顶部加上信息窗口高度的两点来扩展原始边界.
7. 使地图适应新的边界.

大概可以细化使用3点上中左中右中，这是第一次剪辑，概念证明，大概可以清理和细化.

Probably can be refined to use 3 points top center, left center and right center, this is a first cut, proof of concept, can probably be cleaned up and refined.

function initialize() {
  var map = new google.maps.Map(document.getElementById('map-canvas'));
  var projection = null; 
  google.maps.event.addListener(map,'projection_changed', function() {
    projection = map.getProjection();
  }); 

  var bounds = new google.maps.LatLngBounds();
  if (!projection) 
    google.maps.event.addListener(map, 'idle', computeBounds);
  else 
    computeBounds();

  var myLatlng1 = new google.maps.LatLng(51.525209,-0.09402479999994284);
  bounds.extend(myLatlng1);
  var myLatlng2 = new google.maps.LatLng(51.52106840183588,-0.10866641049801729);
  bounds.extend(myLatlng2);
  //  Fit these bounds to the map
  map.fitBounds(bounds);

  function computeBounds() {    

    var contentString1 = '<div class="map-content"><p>Test1<br />dsfasdf<br />dsfasdf<br />dsfasdf<br />dsfasdf<br />dsfasdf<br />dsfasdf</p></div>'
    var infowindow1 = new google.maps.InfoWindow({content: contentString1});
    var marker1 = new google.maps.Marker({position: myLatlng1,map: map,title: 'Test1'});

    google.maps.event.addListener(marker1, 'click', function() {
      infowindow1.open(map,marker1);
    });
    infowindow1.open(map,marker1);
    google.maps.event.addListenerOnce(infowindow1,'domready',calcInfoWindowBounds); 

    var contentString2 = '<div class="map-content"><p><br />dsfasdf<br />dsfasdf<br />dsfasdf<br />dsfasdf<br />dsfasdf</p></div>'
    var infowindow2 = new google.maps.InfoWindow({content: contentString2});
    var marker2 = new google.maps.Marker({position: myLatlng2,map: map,title: 'Test2'});
    google.maps.event.addListener(marker2, 'click', function() {
      infowindow2.open(map,marker2);
    });
    infowindow2.open(map,marker2);

    google.maps.event.addListenerOnce(infowindow2,'domready',calcInfoWindowBounds); 

    function calcInfoWindowBounds(){
      domEls = document.getElementsByClassName('map-content');
      var markerSpace = 32+8;
      var maxTop = 0;
      var maxLeft = 0;
      var maxRight = 0;
      for (var i=0; i<domEls.length; i++) {
        var topOfWindow = domEls[i].offsetHeight + markerSpace;
        var leftOfWindow = domEls[i].offsetWidth/2;
        var rightOfWindow = domEls[i].offsetWidth/2;

        if (topOfWindow > maxTop) maxTop = topOfWindow;
        if (leftOfWindow > maxLeft) maxLeft = leftOfWindow;
        if (rightOfWindow > maxRight) maxRight = rightOfWindow;
      }

      var leftBounds = projection.fromLatLngToPoint(new google.maps.LatLng(bounds.getNorthEast().lat(),bounds.getSouththWest().lng()));
      var rightBounds = projection.fromLatLngToPoint(new google.maps.LatLng(bounds.getNorthEast()));
      var topBounds0 = rightBounds.y + maxTop;
      var rightBounds0 = rightBounds.x + maxRight;
      var leftBounds0 = leftBounds.x - maxLeft;
      bounds.extend(projection.fromPointToLatLng(leftBounds0,topBounds0));
      bounds.extend(projection.fromPointToLatLng(rightBounds0,topBounds0));
      map.fitBounds(bounds);
    }   

  }

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

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