Erstellen Sie eine Bedingung, um die Farbe der Polylinie in der Google Maps-API festzulegen

Sie müssen Ihr Array verarbeiten, indem Sie einzelne Polylinien für jeden Satz von zwei Punkten in Ihren Daten erstellen und jedem Segment die Farbe zuweisen, die einem seiner Endpunkte zugeordnet ist.

// only go to length - 1 or you will overrun the array
for (var i = 0; i < polyline_data.length - 1; i++) {
  // for each segment of two points
  var polylinePlanCoordinates = [];
  polylinePlanCoordinates.push(new google.maps.LatLng(polyline_data[i]['latitude'], polyline_data[i]['longitude']));
  polylinePlanCoordinates.push(new google.maps.LatLng(polyline_data[i + 1]['latitude'], polyline_data[i + 1]['longitude']));

  // create a polyline
  var path = new google.maps.Polyline({
    path: polylinePlanCoordinates,
    geodesic: true,
    strokeOpacity: 1.0,
    strokeWeight: 5
  });
  // set the color of the segment based on the lowest index point
  if (polyline_data[i]['kon_jem'] > 0 && polyline_data[i]['kon_jem'] < 3) {
    path.setOptions({
      strokeColor: '#ffffff'
    });
  } else if (polyline_data[i]['kon_jem'] > 3 && polyline_data[i]['kon_jem'] < 9) {
    path.setOptions({
      strokeColor: '#000000'
    });
  } else if (polyline_data[i]['kon_jem'] > 9) {
    path.setOptions({
      strokeColor: '#fff000'
    });
  }
  path.setMap(map);
}

Proof of Concept Fiddle

Code-Snippet:

function initialize() {
  var map = new google.maps.Map(
    document.getElementById("map_canvas"), {
      center: new google.maps.LatLng(37.4419, -122.1419),
      zoom: 13,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    });
  var bounds = new google.maps.LatLngBounds();
  for (var i = 0; i < polyline_data.length - 1; i++) {
    // for each segment of two points
    var polylinePlanCoordinates = [];
    polylinePlanCoordinates.push(new google.maps.LatLng(polyline_data[i]['latitude'], polyline_data[i]['longitude']));
    polylinePlanCoordinates.push(new google.maps.LatLng(polyline_data[i + 1]['latitude'], polyline_data[i + 1]['longitude']));

    // create a polyline
    var path = new google.maps.Polyline({
      path: polylinePlanCoordinates,
      geodesic: true,
      strokeOpacity: 1.0,
      strokeWeight: 5
    });
    bounds.extend(path.getPath().getAt(0));
    bounds.extend(path.getPath().getAt(1));

    if (polyline_data[i]['kon_jem'] > 0 && polyline_data[i]['kon_jem'] < 3) {
      path.setOptions({
        strokeColor: '#ffffff'
      });
    } else if (polyline_data[i]['kon_jem'] > 3 && polyline_data[i]['kon_jem'] < 9) {
      path.setOptions({
        strokeColor: '#000000'
      });
    } else if (polyline_data[i]['kon_jem'] > 9) {
      path.setOptions({
        strokeColor: '#fff000'
      });
    }
    path.setMap(map);

  }
  map.fitBounds(bounds);
}
google.maps.event.addDomListener(window, "load", initialize);
var polyline_data = [
  {latitude: 0, longitude: 0, kon_jem: 0},
  {latitude: 0.1, longitude: 0.2, kon_jem: 1},
  {latitude: 0.2, longitude: 0.1, kon_jem: 2},
  {latitude: 0.3, longitude: 0.2, kon_jem: 3},
  {latitude: 0.4, longitude: 0.1, kon_jem: 4},
  {latitude: 0.5, longitude: 0.2, kon_jem: 5},
  {latitude: 0.6, longitude: 0.1, kon_jem: 6},
  {latitude: 0.7, longitude: 0.2, kon_jem: 7},
  {latitude: 0.8, longitude: 0.1, kon_jem: 8},
  {latitude: 0.9, longitude: 0.3, kon_jem: 9},
  {latitude: 0.9, longitude: 0.1, kon_jem: 10},
  {latitude: 1.0, longitude: 0.1, kon_jem: 11},
  {latitude: 1.1, longitude: 0.2, kon_jem: 12},
  {latitude: 1.2, longitude: 0.1, kon_jem: 13},
  ];

html,
body,
#map_canvas {
  height: 100%;
  width: 100%;
  margin: 0px;
  padding: 0px
}

<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="map_canvas"></div>