Crafty viewport relative position component

gistfile1.js

Crafty.c("ViewportRelative", {
  _viewportPreviousX: 0,
  _viewportPreviousY: 0,
  _viewportStartX: 0,
  _viewportStartY: 0,
  init: function() {    
    this.bind("EnterFrame", this._frame); 
  },
  _frame: function() {
    if(this._viewportPreviousX != Crafty.viewport._x) {
      this._viewportStartX = Crafty.viewport._x;
        
      this.x += this._viewportPreviousX
      this.x -= Crafty.viewport._x;
        
      this._viewportPreviousX = this._viewportStartX;
    }
        
    if(this._viewportPreviousY != Crafty.viewport._y) {
      this._viewportStartY = Crafty.viewport._y;
        
      this.x += this._viewportPreviousY
      this.x -= Crafty.viewport._y;
        
      this._viewportPreviousX = this._viewportStartX;
    }
  }
});