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This example displays a map of the North Atlantic Ocean with the route of the
Titanic drawn on it.
Get started
Before you can try the sample code, you must configure your development environment.
For more information, seeSet up a Flutter project.
View the code
Dart
//Copyright2025GoogleLLC////LicensedundertheApacheLicense,Version2.0(the"License");//youmaynotusethisfileexceptincompliancewiththeLicense.//YoumayobtainacopyoftheLicenseat////https://www.apache.org/licenses/LICENSE-2.0////Unlessrequiredbyapplicablelaworagreedtoinwriting,software//distributedundertheLicenseisdistributedonan"AS IS"BASIS,//WITHOUTWARRANTIESORCONDITIONSOFANYKIND,eitherexpressorimplied.//SeetheLicenseforthespecificlanguagegoverningpermissionsand//limitationsundertheLicense.import'package:flutter/material.dart';import'package:google_maps_flutter/google_maps_flutter.dart';///DisplaysamapoftheNorthAtlanticOceanwiththerouteoftheTitanic///markedonit.classPolylinesSampleextendsStatelessWidget{constPolylinesSample({super.key});@overrideWidgetbuild(BuildContextcontext){returnGoogleMap(initialCameraPosition:CameraPosition(target:LatLng(49,-23)),polylines:{Polyline(//Polylineidmustbeunique.polylineId:PolylineId('titanic route'),points:[LatLng(50.90,-1.41),//SouthamptonLatLng(49.65,-1.60),//CherbourgLatLng(49.77,-6.71),LatLng(51.83,-8.28),//CobhLatLng(50.96,-8.58),LatLng(41.75,-49.90),//Wreck],width:5,color:Colors.red,geodesic:true,//Customcapsandjointtypesaren't supported on all platforms.startCap:Cap.roundCap,endCap:Cap.roundCap,jointType:JointType.round,consumeTapEvents:true,onTap:()=>debugPrint('clicked route'),),},);}}
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-09-04 UTC."],[],[],null,["# Draw polylines on a map\n\nThis example displays a map of the North Atlantic Ocean with the route of the Titanic drawn on it.\n\nGet started\n-----------\n\nBefore you can try the sample code, you must configure your development environment.\nFor more information, see [Set up a Flutter project](/maps/flutter-package/config).\n\nView the code\n-------------\n\n### Dart\n\n```python\n// Copyright 2025 Google LLC\n//\n// Licensed under the Apache License, Version 2.0 (the \"License\");\n// you may not use this file except in compliance with the License.\n// You may obtain a copy of the License at\n//\n// https://www.apache.org/licenses/LICENSE-2.0\n//\n// Unless required by applicable law or agreed to in writing, software\n// distributed under the License is distributed on an \"AS IS\" BASIS,\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n// See the License for the specific language governing permissions and\n// limitations under the License.\n\nimport 'package:flutter/material.dart';\nimport 'package:google_maps_flutter/google_maps_flutter.dart';\n\n/// Displays a map of the North Atlantic Ocean with the route of the Titanic\n/// marked on it.\nclass PolylinesSample extends StatelessWidget {\n const PolylinesSample({super.key});\n\n @override\n Widget build(BuildContext context) {\n return GoogleMap(\n initialCameraPosition: CameraPosition(target: LatLng(49, -23)),\n polylines: {\n Polyline(\n // Polyline id must be unique.\n polylineId: PolylineId('titanic route'),\n points: [\n LatLng(50.90, -1.41), // Southampton\n LatLng(49.65, -1.60), // Cherbourg\n LatLng(49.77, -6.71),\n LatLng(51.83, -8.28), // Cobh\n LatLng(50.96, -8.58),\n LatLng(41.75, -49.90), // Wreck\n ],\n width: 5,\n color: Colors.red,\n geodesic: true,\n // Custom caps and joint types aren't supported on all platforms.\n startCap: Cap.roundCap,\n endCap: Cap.roundCap,\n jointType: JointType.round,\n consumeTapEvents: true,\n onTap: () =\u003e debugPrint('clicked route'),\n ),\n },\n );\n }\n}\nhttps://github.com/googlemaps-samples/flutter-maps-samples/blob/8f227e8b4d07179e5fb7cc5e8d8cb5440befd229/lib/samples/polylines.dart\n \n```\n\nNext steps\n----------\n\nView the complete set of samples on GitHub:\n\n[View on GitHub](https://github.com/googlemaps-samples/flutter-maps-samples/tree/main/lib/samples)\n\nAlternatively, clone the full set of samples to run them locally by executing the following commands: \n\n git clone -b flutter_samples https://github.com/googlemaps-samples/flutter-maps-samples.git\n cd flutter-samples\n flutter pub get"]]
