Map perspective¶
Setup¶
Prerequisites¶
Build and run¶
Start a terminal/command prompt and go to the map_perspective
directory,
within the flutter examples directory - that is the name of this example project.
Note - the gem_kit
directory containing the Maps SDK for Flutter
should be in the plugins
directory of the example, e.g.
example_pathname/plugins/gem_kit
- see the environment setup guide above.
Replace example_pathname
with the actual example path name,
such as address_search
Download project dependencies:
flutter upgrade
run the following terminal commands in the project directory,
where the pubspec.yaml
file is located:
flutter clean
flutter pub get
Run the example:
flutter run
If such a question appears, select the chrome
browser; in the above example, press 2.
First, verify that the ANDROID_SDK_ROOT
environment variable
is set to the root path of your android SDK.
In android/build.gradle
add the maven {}
block as shown,
within the allprojects {} block
, for both debug and release builds,
without the line numbers, those are for reference:
1allprojects {
2 repositories {
3 google()
4 mavenCentral()
5 maven {
6 url "${rootDir}/../plugins/gem_kit/android/build"
7 }
8 }
9}
in android/app/build.gradle
within the android {}
block, in the defaultConfig {}
block,
the android SDK version minSdk
must be set as shown below.
Additionally, for release builds, in android/app/build.gradle
,
within the android {}
block, add the buildTypes {}
block as shown:
Replace example_pathname
with the actual example pathname, such as center_coordinates
1android {
2 defaultConfig {
3 applicationId "com.magiclane.gem_kit.examples.example_pathname"
4 minSdk 21
5 targetSdk flutter.targetSdk
6 versionCode flutterVersionCode.toInteger()
7 versionName flutterVersionName
8 }
9 buildTypes {
10 release {
11 // TODO: Add your own signing config for the release build.
12 // Signing with the debug keys for now, so `flutter run --release` works.
13 minifyEnabled false
14 shrinkResources false
15 signingConfig signingConfigs.debug
16 }
17 }
18}
Then build the apk:
flutter build apk --debug
flutter build apk --release
build/app/outputs/apk/debug
or
build/app/outputs/apk/release
subdirectory,
for debug or release build respectively,
within the current project directory, such as center_coordinates
app-release.apk
or app-debug.apk
adb push app-release.apk sdcard
And then click on the apk in the file browser on the device to install and run it.
In the ios/Podfile
configuration text file, at the top, set the minimum ios
platform to 13 like this:
platform :ios, '13.0'
pod install
in the [ios folder] ./ios/
flutter build ios
to build a Runner.app.flutter run
to build and run on an attached device.<path/to>/ios/Runner.xcworkspace
project in Xcode
and execute and debug from there.How it works¶
In the example project directory, such as center_coordinates
, there is a text file named
pubspec.yaml
which contains project configuration and dependencies.
The most important lines from this file are shown here:
1name: center_coordinates
2description: A Flutter example using Maps SDK for Flutter.
3
4version: 1.0.0+1
5
6environment:
7 sdk: '>=3.0.5 <4.0.0'
8
9dependencies:
10 flutter:
11 sdk: flutter
12 gem_kit:
13 path: plugins/gem_kit
14
15 cupertino_icons: ^1.0.2
16
17 dev_dependencies:
18 flutter_test:
19 sdk: flutter
20
21 flutter_lints: ^3.0.2
22
23# The following section is specific to Flutter packages.
24flutter:
25 uses-material-design: true
The project must have a name and version. The dependencies list the Flutter SDK, and the gem_kit, Maps for Flutter SDK.
The source code is in example_pathname/lib/main.dart
Replace example_pathname
with the actual example path name, such as center_coordinates
1import 'package:gem_kit/core.dart';
2import 'package:gem_kit/map.dart';
3import 'package:flutter/cupertino.dart';
4import 'package:flutter/material.dart' hide Route;
5
6class _MyHomePageState extends State<MyHomePage> {
7 // Map preferences are used to change map perspective
8 late MapViewPreferences _mapPreferences;
9
10 late bool _isInPerspectiveView = false;
11
12 // Tilt angle for perspective view
13 final double _3dViewAngle = 30;
14
15 // Tilt angle for orthogonal/vertical view
16 final double _2dViewAngle = 90;
17
18 @override
19 void dispose() {
20 GemKit.release();
21 super.dispose();
22 }
23
24 // The callback for when map is ready to use
25 void _onMapCreated(GemMapController controller) async {
26 _mapPreferences = controller.preferences;
27 }
28
29 void _onChangePersectiveButtonPressed() async {
30 setState(() => _isInPerspectiveView = !_isInPerspectiveView);
31
32 // Based on view type, set the view angle
33 if (_isInPerspectiveView) {
34 _mapPreferences.tiltAngle = _3dViewAngle;
35 } else {
36 _mapPreferences.tiltAngle = _2dViewAngle;
37 }
38 }
39}
The dart
material package is imported, as well as the
required gem_kit
packages.
The map view angle is set using _mapPreferences.tiltAngle
where the map preferences are obtained from the GemMapController controller
which is passed in to the _onMapCreated()
callback, called when the
interactive map is initialized and ready to use.
The map view angle is set to 90 degrees (looking vertically downward at the map) for 2D mode.
The map view angle is set to 30 degrees (looking 30 degrees downward from horizon) for 3D mode.