Change cluster icon for a particular google map cluster - markerclusterplus

Question

I would like to change the cluster icon (dynamically/for particular cluster) based on some particular condition. I am able to identify the condition and have restricted further drill-down on the same. At that particular level we are opening infobox for the user.

The problem lies with cluster as I want to change the icon to something else. For the individual pins the icon is fine.

Below is the code that I am trying to implement:

The logic that I am trying to build is that if the cluster has identical pins beneath it (I would not like to drill down) then change the icon to anything else. The function _getPinStatus helps me identify the above logic and creates the infowindow.

I also somehow could not manage to get the zoom change event - but this is rather a separate query

I tried with clearMarkers() function and remap the clusters by providing the image in options_markerclusterer array but it does replace the image on all underlying markers.

I could not find details around setStyles and its implementation. Would it be feasible to push styles once the map is already plotted.

Appreciate any suggestions.

geocodezip · Accepted Answer

You can add additional styles to the style array used to define the Cluster icon styles:

var mcStyles = markerCluster.getStyles();
  mcStyles.push({
    url: "http://www.geocodezip.com/mapIcons/markerclusterer/heart50.png",
    width: 50,
    height: 44,
    anchorIcon: [44, 25],
    textSize: 10,
    textColor: "black",
    textDecoration: "none",
    fontStyle: "normal",
    fontFamily: "Arial,sans-serif",
    backgroundPosition: "0 0",
  });

Then adjust the "calculator" to return the appropriate index (in this case 6) when you hit your "same pin" case:

markerCluster.setCalculator(function(markers, numStyles) {
  var index = 0,
    count = markers.length,
    total = count;

  while (total !== 0) {
    //Create a new total by dividing by a set number
    total = parseInt(total / 5, 10);
    //Increase the index and move up to the next style
    index++;
  }
  index = Math.min(index, numStyles);
  samePin = _getPinStatus(markers);
  if (samePin) {
    return {
      text: count + " (" + count + " Jobs)",
      index: 6 // reference added style
    };
  } else {
    return {
      text: count,
      index: index
    };
  }
});

proof of concept fiddle

code snippet:

var gm_map;
var markerArray = [];
var clusterMarkers = [];
var infoWindow = new google.maps.InfoWindow();

function initialize(searchMarkers = []) {
  var marker, i;

  if (searchMarkers.length == 0) {
    clusterMarkers = [
      new google.maps.Marker({
        position: new google.maps.LatLng(59.381059, 13.504026),
        map: gm_map,
        title: "P1220214 1.JPG",
        label: {
          text: 'Label 1',
          color: '#222222',
          fontSize: '12px'
        }
      }),

      new google.maps.Marker({
        position: new google.maps.LatLng(59.381059, 13.504026),
        map: gm_map,
        title: "P1220214 2.JPG",
        label: {
          text: 'Label 2',
          color: '#222222',
          fontSize: '12px'
        }

      }),

      new google.maps.Marker({
        position: new google.maps.LatLng(59.340715, 13.49631),
        map: gm_map,
        title: "P1220214 3.JPG",
        label: {
          text: 'Label 3',
          color: '#222222',
          fontSize: '12px'
        }

      }),

      new google.maps.Marker({
        position: new google.maps.LatLng(59.327232, 13.487384),
        map: gm_map,
        title: "P1220214 4.JPG",
        label: {
          text: 'Label 4',
          color: '#222222',
          fontSize: '12px'
        }

      }),

      new google.maps.Marker({
        position: new google.maps.LatLng(59.379034, 13.516566),
        map: gm_map,
        title: "P1220214 5.JPG",
        label: {
          text: 'Label 5',
          color: '#222222',
          fontSize: '12px'
        }

      }),

      new google.maps.Marker({
        position: new google.maps.LatLng(59.330000, 13.485000),
        map: gm_map,
        title: "P1220214 6.JPG",
        label: {
          text: 'Label 6',
          color: '#222222',
          fontSize: '12px'
        }

      }),

      new google.maps.Marker({
        position: new google.maps.LatLng(59.328501, 13.485782),
        map: gm_map,
        title: "P1220214 7.JPG",
        label: {
          text: 'Label 7',
          color: '#222222',
          fontSize: '12px'
        }

      }),

      new google.maps.Marker({
        position: new google.maps.LatLng(59.328501, 13.485782),
        map: gm_map,
        title: "P1220214 8.JPG",
        label: {
          text: 'Label 8',
          color: '#222222',
          fontSize: '12px'
        }

      })
    ]
  } else {
    clusterMarkers = searchMarkers;
  }

  var options_googlemaps = {
    minZoom: 9,
    zoom: 9,
    center: new google.maps.LatLng(59.328631, 13.485688),
    maxZoom: 18,
  }

  gm_map = new google.maps.Map(document.getElementById('map'), options_googlemaps)

  var options_markerclusterer = {
    //gridSize: 20,
    maxZoom: 18,
    zoomOnClick: false,
    imagePath: 'https://www.geocodezip.net/mapIcons/markerclusterer/m',
    label: {
      text: 'This is custom text'
    }
  };

  var markerCluster = new MarkerClusterer(gm_map, clusterMarkers, options_markerclusterer);
  var mcStyles = markerCluster.getStyles();
  console.log(mcStyles);
  mcStyles.push({
    url: "https://www.geocodezip.net/mapIcons/markerclusterer/heart50.png",
    width: 50,
    height: 44,
    anchorIcon: [44, 25],
    textSize: 10,
    textColor: "black",
    textDecoration: "none",
    // textLineHeight: 12,
    // fontWeight: "bold",
    fontStyle: "normal",
    fontFamily: "Arial,sans-serif",
    backgroundPosition: "0 0",
  });
  markerCluster.setCalculator(function(markers, numStyles) {
    console.log("setCalculator(numMarkers" + markers.length + ", numStyles=" + numStyles + ")");
    var index = 0,
      count = markers.length,
      total = count;

    while (total !== 0) {
      //Create a new total by dividing by a set number
      total = parseInt(total / 5, 10);
      //Increase the index and move up to the next style
      index++;
    }
    index = Math.min(index, numStyles);
    samePin = _getPinStatus(markers);
    if (samePin) {
      return {
        text: count + " (" + count + " Jobs)",
        index: 6
      };
    } else {
      return {
        text: count,
        index: index
      };
    }
  });


  google.maps.event.addListener(markerCluster, 'clusterclick', function(cluster) {

    //This needs some logic to identify if all the internal pings are at same location - execute else part otherwise further zoom in using if code.
    var markers = cluster.getMarkers();
    var samePin = false;
    samePin = _getPinStatus(markers);

    if (!samePin) {
      gm_map.setCenter(cluster.center_);
      gm_map.setZoom(gm_map.getZoom() + 2);
    } else {
      // This is where I want to change the icon of the particular cluster.   
      var array = [];
      for (i = 0; i < markers.length; i++) {
        array.push(markers[i].getTitle() + '
');
      }
      if (gm_map.getZoom() <= markerCluster.getMaxZoom()) {
        infoWindow.setContent(markers.length + " markers
" + array);
        infoWindow.setPosition(cluster.getCenter());
        infoWindow.open(gm_map);
      }
    }
  });

  for (i = 0; i < clusterMarkers.length; i++) {
    var marker = clusterMarkers[i];

    google.maps.event.addListener(marker, 'click', (function(marker) {
      return function() {
        infoWindow.setContent(this.getTitle());
        infoWindow.open(gm_map, this);
      }
    })(marker));
  }
}

$(document).ready(function() {
  initialize();
  $('body').on('click', '#close-link', function() {
    $('#toggle-photolist').fadeOut();
    $('#close-overlay').fadeOut();
  });
  $('#refreshmap').click(function() {
    searchMarkers = [
      new google.maps.Marker({
        position: new google.maps.LatLng(59.381059, 13.504026),
        map: gm_map,
        title: "Search Data 1.JPG",
        label: {
          text: 'Search label 1',
          color: '#222222',
          fontSize: '12px'
        }

      }),

      new google.maps.Marker({
        position: new google.maps.LatLng(59.338683, 13.492057),
        map: gm_map,
        title: "Search Data 2.JPG",
        label: {
          text: 'Search label 1',
          color: '#222222',
          fontSize: '12px'
        }

      })
    ]
    initialize(searchMarkers);
  });
});

function _getPinStatus(markers) {
  for (i = 0; i < markers.length; i++) {
    var parentLatitude = markers[0].getPosition().lat();
    var parentLongitude = markers[0].getPosition().lng();

    if (markers[i].getPosition().lat() == parentLatitude &&
      markers[0].getPosition().lng() == parentLongitude) {
      samePin = true;
    } else {
      // break out of the loop in case a single pin is different and allow user to further zoom in the map
      samePin = false;
      break;
    }
  }
  return samePin;
}

/* Always set the map height explicitly to define the size of the div
         * element that contains the map. */

#map {
  height: 100%;
}


/* Optional: Makes the sample page fill the window. */

html,
body {
  height: 95%;
  margin: 0;
  padding: 0;
}





  SO MarkerClusterer Question

details on how this works:

MarkerClustererPlus source on GitHub

useStyle:

/**
* Sets the icon styles to the appropriate element in the styles array.
*
* @ignore
* @param sums The icon label text and styles index.
*/
useStyle(sums: ClusterIconInfo): void

Is used in the Cluster updateIcon:

/**
* Updates the cluster icon.
*/
public updateIcon(): void

here: Cluster

const sums = this.markerClusterer_.getCalculator()( this.markers_, numStyles ); this.clusterIcon_.setCenter(this.center_);
this.clusterIcon_.useStyle(sums);
this.clusterIcon_.show();

Where sums is the structure returned by the calculator function:

Change cluster icon for a particular google map cluster - markerclusterplus

Answers (1)

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