ego.js

/**
 * Creates a new Ego. This is the main character whom the player controls. The
 * name originates with the old Sierra On-Line 3D animated adventure games. There
 * should be only one instance of this class.
 * 
 * @constructor
 * @extends Actor
 */
$.Ego = function() {
  $.Actor.call(this, 50, 150, 'grey', 0.95, 5, 'white', 'grey', 'red');
  this.elem.classList.add('ego');
  this.elem.id = 'me';
  this.setDirection($.Sprite.OUT);
};

$.Ego.prototype = Object.create($.Actor.prototype);
$.Ego.prototype.constructor = $.Ego;

/**
 * Invoked when Ego has hit another Sprite.
 * 
 * @param obj The Sprite that Ego has hit.
 */
$.Ego.prototype.hit = function(obj) {
  // Reset the position to the last one that isn't touching another Sprite. Resetting
  // the position prevents Ego from walking through obstacles. 
  for (;this.reset() && this.touching(obj););
};

/**
 * Invoked by the move method when Ego has hit an edge. If the edge is the ground, then the
 * edge parameter is undefined. If the edge is one of the four directions, then Ego is 
 * attempting to exit the current room. 
 *  
 * @param {Array} edge If defined, it will be an array that represents the edge that was hit.
 */
$.Ego.prototype.hitEdge = function(edge) {
  if (edge) {
    // Stop moving.
    this.destX = this.destZ = -1;
    this.heading = null;
    this.cell = 0;
    
    // Now check if there is a room on this edge.
    if (edge < 5) {
      var edgeData = $.Game.rooms[this.room - 1][edge];
      if (edgeData) {
        $.Game.userInput = false;
        
        // Hide ego before we reposition him to the new entry point.
        this.hide();
        
        // Set the new room for ego.
        this.room = edgeData[0];
        
        // Work out the new position for ego.
        switch (edgeData[1]) {
          case 1: // From the left edge of screen
            this.setPosition(0 - this.width * 2, this.y, 600);
            this.setDirection($.Sprite.RIGHT);
            this.moveTo(this.width + 50, 600, function() {
              $.Game.userInput = true;
            });
            break;
            
          case 2: // From the left door
            this.setPosition(268, this.y, 500);
            this.setDirection($.Sprite.OUT);
            this.moveTo(293, 600, function() {
              $.Game.userInput = true;
            });
            break;
            
          case 3: // From the right door
            this.setPosition(645, this.y, 500);
            this.setDirection($.Sprite.OUT);
            this.moveTo(670, 600, function() {
              $.Game.userInput = true;
            });
            break;
            
          case 4: // From the right edge of screen
            this.setPosition(960 + this.width, this.y, 600);
            this.setDirection($.Sprite.LEFT);
            this.moveTo(960 - this.width - 50, 600, function() {
              $.Game.userInput = true;
            });
            break;
        }
        
        this.step = 1;
      }
    }
  }
};