var Model = function(canvas, context) {
  this.tadpoles = {};
  this.userTadpole = new Tadpole();
	this.userTadpole.id = -1;
	this.tadpoles[this.userTadpole.id] = this.userTadpole;

  this.camera = new Camera(canvas, context, this.userTadpole.x, this.userTadpole.y);
	this.arrows = {};

  this.waterParticles = [];
  for(var i = 0; i < 150; i++) {
    this.waterParticles.push(new WaterParticle());
  }
  //
  this.username;
  this.password;
  this.password_confirmation;
  this.authorized = false;
  this.profile_errors;
}