code: public void setColorByHSL(float hue, float saturation, float lightness,
  			float alpha) {
  		setColorByHSL(hue, saturation, lightness);
  		setAlpha(alpha);
  	}
docs: Set the color with HSLA (hue, saturation, lightness, alpha) values
  
  @param hue
  hue value inclusively between 0.0 and 360.0
  @param saturation
  saturation inclusively between 0.0 and 1.0
  @param lightness
  lightness inclusively between 0.0 and 1.0
  @param alpha
  alpha inclusively between 0.0 and 1.0