Refreshing Comet Sessions in Fab.js

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Today is minor bug day in my (fab) game. First up, my player seem to be hitting a wall well before the bottom of the room. That turns out to be a simple matter of adding the scroll amount to the screen coordinates where I ought to be subtracting:

    var c_x = avatar.attr("cx") +
              $(self.avatar.paper.canvas).parent().offset().left +
              $(document).scrollLeft();

    var c_y = avatar.attr("cy") +
              $(self.avatar.paper.canvas).parent().offset().top +
              $(document).scrollTop();

Sigh. I do not believe that I will ever be able to know when to add or subtract browser coordinates. I may forever be doomed to try one, fail, then go with the right way:

    var c_x = avatar.attr("cx") +
              $(self.avatar.paper.canvas).parent().offset().left -
              $(document).scrollLeft();

    var c_y = avatar.attr("cy") +
              $(self.avatar.paper.canvas).parent().offset().top -
              $(document).scrollTop();

Next up, I am having trouble reloading the game.

For each player in my (fab) game, the backend keeps track of the comet <iframe> so that it can broadcast changes. We have noticed of late that reloading the game does not reload the comet <iframe>.

Hrm.. I eventually track this down to the code that adds players:

function broadcast_new (app) {
  return function () {
    var out = this;

    return app.call( function listener(obj) {
      if (obj && obj.body && obj.body.id) {
        var new_id = obj.body.id;

        if (!players[new_id]) {
          puts("[broadcast_new] adding: " + new_id);

          // Add player to local store
        }
      }
      else {
        out(obj);
      }
      return listener;
    });
  };
}

The problem, of course, is that the player is already in the local store so it will not re-added when the page is reloaded.

For now, I will remove the conditional. That will make it easy for others to impersonate players, so I will have to come up with another strategy, but I will leave that for another day.


Day #146