Google将拖动矩形映射到选择标记

Question

我试图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.

要绘制矩形,请按住Shift键,单击并拖动.

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

为什么.contains方法仅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绘制的相同区域返回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);
                //} 
            }

更新这个工作,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"边界

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
            });
        }
    }
});

工作实例

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的工作版本进行了一些更改.

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.(我猜可能会以另一种方式进行优化.)

更新:发现另一个问题,如果用户在鼠标向上之前释放了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/
• 演示http://fiddle.jshell.net/7ZxMA/4/show/

更新:找到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/
• 演示http://fiddle.jshell.net/7ZxMA/6/show/