Adding go desktop example

.gitignore

@@ -12,4 +12,5 @@ doc/api/
 
 android/
 ios/
+desktop/
 build/

doc/examples/go_desktop/.gitignore

@@ -0,0 +1,70 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# Visual Studio Code related
+.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+.dart_tool/
+.flutter-plugins
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Android related
+**/android/**/gradle-wrapper.jar
+**/android/.gradle
+**/android/captures/
+**/android/gradlew
+**/android/gradlew.bat
+**/android/local.properties
+**/android/**/GeneratedPluginRegistrant.java
+
+# iOS/XCode related
+**/ios/**/*.mode1v3
+**/ios/**/*.mode2v3
+**/ios/**/*.moved-aside
+**/ios/**/*.pbxuser
+**/ios/**/*.perspectivev3
+**/ios/**/*sync/
+**/ios/**/.sconsign.dblite
+**/ios/**/.tags*
+**/ios/**/.vagrant/
+**/ios/**/DerivedData/
+**/ios/**/Icon?
+**/ios/**/Pods/
+**/ios/**/.symlinks/
+**/ios/**/profile
+**/ios/**/xcuserdata
+**/ios/.generated/
+**/ios/Flutter/App.framework
+**/ios/Flutter/Flutter.framework
+**/ios/Flutter/Generated.xcconfig
+**/ios/Flutter/app.flx
+**/ios/Flutter/app.zip
+**/ios/Flutter/flutter_assets/
+**/ios/ServiceDefinitions.json
+**/ios/Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!**/ios/**/default.mode1v3
+!**/ios/**/default.mode2v3
+!**/ios/**/default.pbxuser
+!**/ios/**/default.perspectivev3
+!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages

doc/examples/go_desktop/.metadata

@@ -0,0 +1,10 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: 0ba67226ee62d6c9d663a6f8410fb4b2f1076046
+  channel: dev
+
+project_type: app

doc/examples/go_desktop/README.md

@@ -0,0 +1,19 @@
+# go_desktop
+
+This is an example game for testing Flame games on the desktop using the [go-flutter-desktop](https://github.com/go-flutter-desktop/go-flutter) library.
+
+This game features a very simple box on the screen where you can move it using WASD keys.
+
+To run this you need to have go and hover installed, you can find a good guide on how to install both [here](https://github.com/go-flutter-desktop/hover#install);
+
+After the installation, you will need to initialize the desktop runtime on the project, you con do it by simply running:
+
+```
+hover init projectUrl
+```
+
+Then just run by issue the command:
+
+```
+hover run
+```

doc/examples/go_desktop/lib/game.dart

@@ -0,0 +1,65 @@
+import 'package:flame/game.dart';
+
+import 'package:flutter/services.dart';
+import 'package:flutter/material.dart';
+
+class MyGame extends BaseGame {
+
+  static final Paint paint = Paint()..color = Color(0xFFFFFFFF);
+
+  var movingLeft = false;
+  var movingRight = false;
+  var movingUp = false;
+  var movingDown = false;
+
+  double x = 0;
+  double y = 0;
+
+  MyGame() {
+    _start();
+  }
+
+  void _start() {
+    RawKeyboard.instance.addListener((RawKeyEvent e) {
+      final bool isKeyDown = e is RawKeyDownEvent;
+
+      final keyLabel = e.data.logicalKey.keyLabel;
+
+      if (keyLabel == "a") {
+        movingLeft = isKeyDown;
+      }
+
+      if (keyLabel == "d") {
+        movingRight = isKeyDown;
+      }
+
+      if (keyLabel == "w") {
+        movingUp = isKeyDown;
+      }
+
+      if (keyLabel == "s") {
+        movingDown = isKeyDown;
+      }
+    });
+  }
+
+  @override
+  void update(double dt) {
+    if (movingLeft) {
+      x -= 100 * dt;
+    } else if (movingRight) {
+      x += 100 * dt;
+    }
+
+    if (movingUp) {
+      y -= 100 * dt;
+    } else if (movingDown) {
+      y += 100 * dt;
+    }
+  }
+
+  @override
+  void render(Canvas canvas) {
+    canvas.drawRect(Rect.fromLTWH(x, y, 100, 100), paint);
+  }
+}

doc/examples/go_desktop/lib/main.dart

@@ -0,0 +1,5 @@
+import 'package:flutter/material.dart';
+
+import './game.dart';
+
+void main() => runApp(MyGame().widget);

doc/examples/go_desktop/lib/main_desktop.dart

@@ -0,0 +1,10 @@
+import 'package:flutter/foundation.dart' show debugDefaultTargetPlatformOverride;
+
+import 'package:flutter/material.dart';
+
+import './game.dart';
+
+void main() {
+  debugDefaultTargetPlatformOverride = TargetPlatform.fuchsia;
+  runApp(MyGame().widget);
+}

doc/examples/go_desktop/pubspec.yaml

@@ -0,0 +1,17 @@
+name: go_desktop
+description: Flame sample game on using the go flutter desktop framework
+
+version: 1.0.0+1
+
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+  flame:
+      path: ../../../
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter