Google Maps - eigene Marker und Symbole

Einfache Marker

http://code.google.com/intl/de-DE/apis/maps/documentation/javascript/overlays.html#Markers (11/2011)

Ein einfacher selbstgemachter Marker ersetzt einfach den Standard Pin von Google. Die Größe wird dabei automatisch angepasst.

	// Einfacher Marker für die Achalm
	var posAchalm = new google.maps.LatLng(48.493978,9.244276);
	var imgAchalm = 'images/beachflag.png';
	var marker = new google.maps.Marker({
		position: posAchalm,
		icon: imgAchalm,
		map: map,
		title:"Achalm"
	});

Komplexe Marker

Komplexen MarkerImage Objekte können aus mehreren Teilen bestehen. Außerdem gibt man zusätzliche Parameter an mit denen anklickbare Regionen, Ausschnitte, Hotspot, Schattenbilder usw. definiert werden.

Wichtige Optionen sind:

• size - Größe des Bilds
• origin - wenn das gewünschte Bild z. B. Teil eines größeren Bildes in einem Sprite ist
• anchor - wo der Hotspot des Symbols lokalisiert sein soll (basierend auf dem Ursprung).

Beispiel von Google

function initialize() {
  var myOptions = {
    zoom: 10,
    center: new google.maps.LatLng(-33.9, 151.2),
    mapTypeId: google.maps.MapTypeId.ROADMAP
  }
  var map = new google.maps.Map(document.getElementById("map_canvas"),
                                myOptions);

  setMarkers(map, beaches);
}

/**
 * Data for the markers consisting of a name, a LatLng and a zIndex for
 * the order in which these markers should display on top of each
 * other.
 */
var beaches = [
  ['Bondi Beach', -33.890542, 151.274856, 4],
  ['Coogee Beach', -33.923036, 151.259052, 5],
  ['Cronulla Beach', -34.028249, 151.157507, 3],
  ['Manly Beach', -33.80010128657071, 151.28747820854187, 2],
  ['Maroubra Beach', -33.950198, 151.259302, 1]
];

function setMarkers(map, locations) {
  // Add markers to the map

  // Marker sizes are expressed as a Size of X,Y
  // where the origin of the image (0,0) is located
  // in the top left of the image.

  // Origins, anchor positions and coordinates of the marker
  // increase in the X direction to the right and in
  // the Y direction down.
  var image = new google.maps.MarkerImage('images/beachflag.png',
      // This marker is 20 pixels wide by 32 pixels tall.
      new google.maps.Size(20, 32),
      // The origin for this image is 0,0.
      new google.maps.Point(0,0),
      // The anchor for this image is the base of the flagpole at 0,32.
      new google.maps.Point(0, 32));
  var shadow = new google.maps.MarkerImage('images/beachflag_shadow.png',
      // The shadow image is larger in the horizontal dimension
      // while the position and offset are the same as for the main image.
      new google.maps.Size(37, 32),
      new google.maps.Point(0,0),
      new google.maps.Point(0, 32));
      // Shapes define the clickable region of the icon.
      // The type defines an HTML <area> element 'poly' which
      // traces out a polygon as a series of X,Y points. The final
      // coordinate closes the poly by connecting to the first
      // coordinate.
  var shape = {
      coord: [1, 1, 1, 20, 18, 20, 18 , 1],
      type: 'poly'
  };
  for (var i = 0; i < locations.length; i++) {
    var beach = locations[i];
    var myLatLng = new google.maps.LatLng(beach[1], beach[2]);
    var marker = new google.maps.Marker({
        position: myLatLng,
        map: map,
        shadow: shadow,
        icon: image,
        shape: shape,
        title: beach[0],
        zIndex: beach[3]
    });
  }
}