Add basic gameobject system

frontend/src/scripts/objects/game-object.ts

@@ -1,7 +1,38 @@
 import { Typed } from '../transport/serializable';
 import { Vec2 } from '../math/vec2';
+import { IdentityManager } from '../identity/identity-manager';
+import { Command } from '../commands/command';
+import { CommandReceiver } from '../commands/command-receiver';
 
-export class GameObject extends Typed {
-  public position = new Vec2();
-  public boundingBoxSize = new Vec2();
+export abstract class GameObject extends Typed implements CommandReceiver {
+  public readonly id = IdentityManager.generateId();
+
+  protected _position = new Vec2();
+  public get position(): Vec2 {
+    return this._position;
+  }
+
+  protected _boundingBoxSize = new Vec2();
+  public get boundingBoxSize(): Vec2 {
+    return this._boundingBoxSize;
+  }
+
+  private commandExecutors: {
+    [commandName: string]: (e: Command) => void;
+  } = {};
+
+  protected addCommandExecutor<T extends Command>(
+    commandType: new () => T,
+    handler: (command: T) => void
+  ) {
+    this.commandExecutors[commandType.name] = handler;
+  }
+
+  public sendCommand(command: Command) {
+    const commandType = command.constructor.name;
+
+    if (this.commandExecutors.hasOwnProperty(commandType)) {
+      this.commandExecutors[commandType](command);
+    }
+  }
 }