code: @PostConstruct
  	protected void postConstruct() {
  		if (pixelPerUnitBased) {
  			//	Calculate numerator and denominator
  			if (pixelPerUnit > PIXEL_PER_METER) {
  				this.numerator = pixelPerUnit / conversionFactor;
  				this.denominator = 1;
  			} else {
  				this.numerator = 1;
  				this.denominator = PIXEL_PER_METER / pixelPerUnit;
  			}
  			setPixelPerUnitBased(false);
  		} else {
  			// Calculate PPU
  			this.pixelPerUnit = numerator / denominator * conversionFactor;
  			setPixelPerUnitBased(true);
  		}
  	}
docs: Finish configuration.