Customize route polylines

This document covers how to customize route polylines for the map you use in your web-based journey tracking app for consumer users.

With the Consumer SDK, you can control route polyline visibility or style the route polyline for a journey's route on the map. The SDK creates a google.maps.Polyline object for each pair of coordinates in the journey's active or remaining path. The library then applies these customizations in two situations:

• before adding the objects to the map
• when the data used for the objects have changed

Style route polylines

Similar to how you can style markers, you style route polylines using customization parameters. From there, you configure styling using one of the following approaches:

• Simplest: Use PolylineOptions to apply to all of the matched Polyline objects when they are created or updated.
• Advanced: Specify a customization function. Customization functions allow for individual styling of the objects based on data sent by Fleet Engine. The function can change the styling of each object based on the current state of the journey; for example, coloring the Polyline object a deeper shade, or making it thicker when the vehicle is moving slower. You can even join against from sources outside Fleet Engine and style the Polyline object based on that information.

Customization parameters

When styling route polylines, you use parameters provided in FleetEngineTripLocationProviderOptions. These parameters provide for different path states in the vehicle's journey, as follows:

• Already traveled paths: Use takenPolylineCustomization.
• Actively traveled path: Use activePolylineCustomization.
• Not-yet traveled path: Use remainingPolylineCustomization.

Use PolylineOptions

The following example shows how to configure the styling for a Polyline object with PolylineOptions. Follow this pattern to customize the styling of any Polyline object using any of the polyline customizations listed earlier.

activePolylineCustomization = {
  strokeWidth: 5,
  strokeColor: 'black',
};

activePolylineCustomization = {
  strokeWidth: 5,
  strokeColor: 'black',
};

Use customization functions to style route polylines

The following example shows how to configure styling for an active route polyline. Follow this pattern to customize the styling of any Polyline object using any of the route polyline customization parameters listed earlier.

// Color the route polyline objects in green if the vehicle is nearby.
activePolylineCustomization =
  (params) => {
    const distance = params.trip.remainingWaypoints[0].distanceMeters;
    if (distance < 1000) {

      // params.polylines contains an ordered list of Polyline objects for
      // the path.
      for (const polylineObject of params.polylines) {
        polylineObject.setOptions({strokeColor: 'green'});
      }
    }
  };

// Color the route Polyline objects in green if the vehicle is nearby.
activePolylineCustomization =
  (params: TripPolylineCustomizationFunctionParams) => {
    const distance = params.trip.remainingWaypoints[0].distanceMeters;
    if (distance < 1000) {

      // params.polylines contains an ordered list of Polyline objects for
      // the path.
      for (const polylineObject of params.polylines) {
        polylineObject.setOptions({strokeColor: 'green'});
      }
    }
  };

Control route polyline visibility

By default, all Polyline objects are visible. To make a Polyline object invisible, set its visible property:

remainingPolylineCustomization = {visible: false};

remainingPolylineCustomization = {visible: false};