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step-10.md

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Step 10: Put it all together

In this step, you put all together what you done in the previous and play the game :)

Keywords: WebSocket client, enjoy

Update the risk-game element

→ Copy and paste the template below in web/game.html:

<link rel="import" href="packages/polymer/polymer.html">

<link rel="import" href="board.html">
<link rel="import" href="hello.html">
<link rel="import" href="players.html">
<link rel="import" href="modal.html">
<link rel="import" href="registration.html">
<link rel="import" href="packages/risk_engine/components/history.html">
<link rel="import" href="packages/risk_engine/components/panel.html">

<polymer-element name="risk-game">
  <template>
    <link rel="stylesheet" href="css/risk.css">
    <link rel="stylesheet" href="packages/bootstrap_for_pub/3.1.0/css/bootstrap.min.css">
    <link rel="stylesheet" href="packages/bootstrap_for_pub/3.1.0/css/bootstrap-theme.min.css">

    <section class="container-fluid">
      <div class="row">
        <!-- Risk Board -->
        <risk-board id='board' game="{{ game }}" playerId="{{ playerId }}" class="col-md-9"
          on-attack="{{ attack }}"
          on-move="{{ move }}"
          on-selection="{{ selection }}"></risk-board>

        <div class="col-md-3">
          <hello-world name="{{ game.players[playerId].name }}"></hello-world>

          <risk-players players="{{ game.players.values }}" activePlayerId="{{ game.activePlayerId }}" playersOrder="{{ game.playersOrder }}"></risk-players>

          <risk-panel game="{{ game }}" playerId="{{ playerId }}" pendingMove="{{ pendingMove }}"
            on-startgame="{{ startGame }}"
            on-movearmies="{{ moveArmies }}"
            on-endattack="{{ endAttack }}"
            on-endturn="{{ endTurn }}"></risk-panel>

          <risk-history game="{{ game }}"></risk-history>
        </div>
      </div>
    </section>

    <template if="{{ !game.started && game.players[playerId] == null }}">
      <risk-modal header="Player registration">
        <risk-registration on-done='{{ joinGame }}'></risk-registration>
      </risk-modal>
    </template>
  </template>
  
  <script type="application/dart" src="game.dart"></script>
</polymer-element>

→ In web/game.dart, extend RiskGame with AbstractRiskGame and implement the missing methods:

import 'dart:convert';
import 'dart:html';
import 'package:polymer/polymer.dart';
import 'package:risk_engine/client.dart';
import 'package:risk/risk.dart';

@CustomTag('risk-game')
class RiskGame extends AbstractRiskGame {
  RiskGame.created(): super.created();

  // TODO: return the engine event Codec you previously implemented
  @override
  Codec<Object, Map> get eventEngineCodec => null;

  // TODO: Instantiate a RiskGameStateImpl
  @override
  final RiskGameState game = null;

  /// Listen events on the given [webSocket].
  @override
  void listen(WebSocket ws) {
    // TODO: listen message coming from the given WebSocket, decode them and handle them with `handleEvents`
  }

  /// Send the given [event] through the WebSocket 
  @override
  void sendEvent(PlayerEvent event) {
    // TODO: encode and send the given event through the WebSocket
  }

  /// Send a JoinGame event though the WebSocket
  joinGame(CustomEvent e, var detail, Element target) {
    // TODO: send a JoinGame event, filled with the data in `detail`
  }
}

Key information:

  • AbstractRiskGame class opens the WebSocket on the same url as the window location. It also provides logical in handleEvents to handle EngineEvent. It already implements Player interaction events sending the right PlayerEvent.
  • The risk-panel custom element provided in the risk_engine lib and handles some of the user interactions.
  • The risk-history displays all the human readable incoming events.

Play the game

Congratulations! You finish this codelab. Enjoy your job and play Risk with your friends :)

→ Run the server bin/main.dart

→ Launch Dartium with the url http://localhost:3000

Learn more

Problems?

Check your code against the files in s10_alltogether (diff).

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