code: function(point) {
          var resolution = this.getResolution();
          var extent = this.extent;
          var x = ((point.x - this.featureDx) / resolution + (-extent.left / resolution));
          var y = ((extent.top / resolution) - point.y / resolution);
          return [x, y];
      }
docs: Method: getLocalXY
  transform geographic xy into pixel xy
  
  Parameters:
  point - {<OpenLayers.Geometry.Point>}