Question

我正在尝试在谷歌地图上绘制一个矩形，并检测是否有任何标记在矩形的范围内。

要绘制一个矩形，按住Shift键，单击并拖动。

我在这里有一个工作样本 - http://jsfiddle.net/dbwPQ/3/

为什么.contains方法只有在从左下角到右上角或从右上角到左下角绘制矩形时才返回true。

然而，从左上角到右下角或右下角到左上角的相同区域返回false ????

                if (boundsSelectionArea.contains(markers[key].position))
            //if (gribBoundingBox.getBounds().getNorthEast().lat() <= markers[key].position.lat() &&
            //    gribBoundingBox.getBounds().getSouthWest().lat() >= markers[key].position.lat() && 
            //    gribBoundingBox.getBounds().getSouthWest().lng() <= markers[key].position.lng() && 
            //    gribBoundingBox.getBounds().getNorthEast().lng() >= markers[key].position.lng() ) 
            {
                //if(flashMovie !== null && flashMovie !== undefined) {
                console.log("User selected:" + key + ", id:" + markers[key].id);
                //}
            } else {
                //if(flashMovie !== null && flashMovie !== undefined) {
                console.log("User NOT selected:" + key + ", id:" + markers[key].id);
                //} 
            }

更新这有效，但我不知道为什么？ http://jsfiddle.net/dbwPQ/4/

Answer 1

看起来google.maps.Rectangle.getBounds正在返回“无效”界限

key:Vince posn:(53.801279, -1.5485670000000482) out of bnds:((55.45394132943307, -4.0869140625), (52.72298552457069, 1.7138671875))
key:Vince posn:(53.801279, -1.5485670000000482) in bnds:((52.26815737376817, -4.04296875), (55.65279803318956, 2.2412109375))

如果您使用两个角扩展一个空的google.maps.LatLng对象，它将起作用：

google.maps.event.addListener(themap, 'mousemove', function (e) {
    if (mouseIsDown && shiftPressed) {
        if (gribBoundingBox !== null) // box exists
        {
            bounds.extend(e.latLng);                
            gribBoundingBox.setBounds(bounds); // If this statement is enabled, I lose mouseUp events

        } else // create bounding box
        {
            bounds = new google.maps.LatLngBounds();
            bounds.extend(e.latLng);
            gribBoundingBox = new google.maps.Rectangle({
                map: themap,
                bounds: bounds,
                fillOpacity: 0.15,
                strokeWeight: 0.9,
                clickable: false
            });
        }
    }
});

working example

代码段

var map;
var markers = {};
var bounds = null;
// add marker to object
var posi = new google.maps.LatLng(53.801279, -1.548567);
var name = 'Vince';
markers[name] = {};
markers[name].id = 1;
markers[name].lat = 53.801279;
markers[name].lng = -1.548567;
markers[name].state = 'Online';
markers[name].position = posi;
markers[name].selected = false;

$(document).ready(function() {

  var mapOptions = {
    zoom: 5,
    center: new google.maps.LatLng(53.801279, -1.548567),
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };
  map = new google.maps.Map(document.getElementById('map'), mapOptions);
  var infowindow = new google.maps.InfoWindow();
  for (var key in markers) {
    var marker = new google.maps.Marker({
      position: new google.maps.LatLng(markers[key].lat, markers[key].lng),
      map: map
    });
    markers[key].marker = marker;

    google.maps.event.addListener(marker, 'click', (function(marker, key) {
      return function() {
        infowindow.setContent(key);
        infowindow.open(map, marker);
      }
    })(marker, key));
  }

  // Start drag rectangle to select markers !!!!!!!!!!!!!!!!
  var shiftPressed = false;

  $(window).keydown(function(evt) {
    if (evt.which === 16) { // shift
      shiftPressed = true;
    }
  }).keyup(function(evt) {
    if (evt.which === 16) { // shift
      shiftPressed = false;
    }
  });

  var mouseDownPos, gribBoundingBox = null,
    mouseIsDown = 0;
  var themap = map;

  google.maps.event.addListener(themap, 'mousemove', function(e) {
    if (mouseIsDown && shiftPressed) {
      if (gribBoundingBox !== null) // box exists
      {
        bounds.extend(e.latLng);
        gribBoundingBox.setBounds(bounds); // If this statement is enabled, I lose mouseUp events

      } else // create bounding box
      {
        bounds = new google.maps.LatLngBounds();
        bounds.extend(e.latLng);
        gribBoundingBox = new google.maps.Rectangle({
          map: themap,
          bounds: bounds,
          fillOpacity: 0.15,
          strokeWeight: 0.9,
          clickable: false
        });
      }
    }
  });

  google.maps.event.addListener(themap, 'mousedown', function(e) {
    if (shiftPressed) {

      mouseIsDown = 1;
      mouseDownPos = e.latLng;
      themap.setOptions({
        draggable: false
      });
    }
  });

  google.maps.event.addListener(themap, 'mouseup', function(e) {
    if (mouseIsDown && shiftPressed) {
      mouseIsDown = 0;
      if (gribBoundingBox !== null) // box exists
      {
        var boundsSelectionArea = new google.maps.LatLngBounds(gribBoundingBox.getBounds().getSouthWest(), gribBoundingBox.getBounds().getNorthEast());

        for (var key in markers) { // looping through my Markers Collection	

          //                    if (boundsSelectionArea.contains(markers[key].marker.getPosition())) 
          if (gribBoundingBox.getBounds().contains(markers[key].marker.getPosition())) {
            //if(flashMovie !== null && flashMovie !== undefined) {
            markers[key].marker.setIcon("http://maps.google.com/mapfiles/ms/icons/blue.png")
            document.getElementById('info').innerHTML += "key:" + key + " posn:" + markers[key].marker.getPosition() + " in bnds:" + gribBoundingBox.getBounds() + "<br>";
            // console.log("User selected:" + key + ", id:" + markers[key].id);
            //}   
          } else {
            //if(flashMovie !== null && flashMovie !== undefined) {
            markers[key].marker.setIcon("http://maps.google.com/mapfiles/ms/icons/red.png")
            document.getElementById('info').innerHTML += "key:" + key + " posn:" + markers[key].marker.getPosition() + " out of bnds:" + gribBoundingBox.getBounds() + "<br>";
            // console.log("User NOT selected:" + key + ", id:" + markers[key].id);
            //} 
          }
        }

        gribBoundingBox.setMap(null); // remove the rectangle
      }
      gribBoundingBox = null;

    }

    themap.setOptions({
      draggable: true
    });
    //stopDraw(e);
  });

});

#map {
  height: 500px;
  width: 500px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="map"></div>
<div id="info"></div>

Answer 2

我对geocodezip的工作版本有一些改变。

如果使用LatLngBounds的“延伸”，当你移动到内部时，它只会变大但不会变小。所以我每次鼠标移动都会生成LatLngBounds以满足我的要求。（它可能会以另一种方式进行优化。）

更新：发现另一个问题，如果用户在鼠标按下之前释放了shift键，则gridbound将粘贴在地图上，并在以下代码中修复它。

google.maps.event.addListener(themap, 'mousemove', function (e) {
+   if (mouseIsDown && (shiftPressed|| gribBoundingBox != null) ) {
        if (gribBoundingBox !== null) // box exists
        {         
+           var newbounds = new google.maps.LatLngBounds(mouseDownPos,null);
+           newbounds.extend(e.latLng);    
+           gribBoundingBox.setBounds(newbounds); // If this statement is enabled, I lose mouseUp events

        } else // create bounding box
        {
            gribBoundingBox = new google.maps.Rectangle({
                map: themap,
+               bounds: null,
                fillOpacity: 0.15,
                strokeWeight: 0.9,
                clickable: false
            });
        }
    }
});

google.maps.event.addListener(themap, 'mouseup', function (e) {
+   if (mouseIsDown && (shiftPressed|| gribBoundingBox != null)) {
        mouseIsDown = 0;

    /*........*/

工作小提琴http://jsfiddle.net/7ZxMA/4/
demo http://fiddle.jshell.net/7ZxMA/4/show/

<强>更新：找到了您可能感兴趣的另一个场景。

使用按钮选择地图。（用户可以单击“选择地图”按钮选择标记或使用shift键选择标记。）

工作小提琴http://jsfiddle.net/7ZxMA/6/
demo http://fiddle.jshell.net/7ZxMA/6/show/

Answer 3

你错过了google.maps.LatLngBounds class的构造函数。根据{{3}}，你必须通过两个论点：西南角和东北角。但是，有时你会经过东南角和西北角。这可能会对.contains方法产生影响。

Google将拖动矩形映射到选择标记

3 个答案: