How to use the raphael.el function in raphael

tmp1 = Math.sqrt(Math.cos(phi1 / 180 * pi)) + 2 * n * Math.sin(phi1 / 180 * pi);
      tmp2 = scale * Math.pow(tmp1 - 2 * n * Math.sin(midLat / 180 * pi),0.5) / n;
      tmp3 = n * (lng - midLng);
      p     = scale * Math.pow(tmp1 - 2 * n * Math.sin(lat / 180 * pi),0.5) / n;
      x     = p * Math.sin(tmp3 / 180 * pi);
      y     = tmp2 - p * Math.cos(tmp3 / 180 * pi);
      return([x,y])
    }
  }

  map.draw();
  return map;
};


Raphael.el.darken = function(increment) {
  hsl = Raphael.rgb2hsl(this.attr('fill'));
  var newLightness = (hsl.l - increment <= 0) ? 0 : (hsl.l - increment);
  this.attr({fill: "hsl("+ hsl.h +","+hsl.s+","+newLightness+")"});
}

Raphael.el.lighten = function(increment) {
  hsl = Raphael.rgb2hsl(this.attr('fill'));
  var newLightness = (hsl.l + increment >= 1) ? 1 : (hsl.l + increment);
  this.attr({fill: "hsl("+ hsl.h +","+hsl.s+","+newLightness+")"});
}

this.gauge.level.animate = function(attrs, refreshAnimationTime, refreshAnimationType) {
            if (attrs.fill) {
                attrs.stroke = attrs.fill;
                attrs.fill = 'rgba(0,0,0,0)';
            }
            return Raphael.el.animate.call(tbGauge.gauge.level, attrs, refreshAnimationTime, refreshAnimationType);
        }

return([x,y])
    }
  }

  map.draw();
  return map;
};


Raphael.el.darken = function(increment) {
  hsl = Raphael.rgb2hsl(this.attr('fill'));
  var newLightness = (hsl.l - increment <= 0) ? 0 : (hsl.l - increment);
  this.attr({fill: "hsl("+ hsl.h +","+hsl.s+","+newLightness+")"});
}

Raphael.el.lighten = function(increment) {
  hsl = Raphael.rgb2hsl(this.attr('fill'));
  var newLightness = (hsl.l + increment >= 1) ? 1 : (hsl.l + increment);
  this.attr({fill: "hsl("+ hsl.h +","+hsl.s+","+newLightness+")"});
}