anchor.diff:  
     void _brightnessChanged(ColorData stop) {
       bright = stop.whiteness;
  -    brightLocation = stop.colorLocation;
  +    _brightLocation = stop.colorLocation;
       
       _calcBright(colorValue);
       _darknessSlider.backgroundStyle = "linear-gradient(to right, ${colorValue.toString()}, #000000)";
  
positive.code:       b = min(255, b + bright.b);
        
        // Flip darklocation because we want the "left" end to be brighter.
        r = (r * (1.0 - darkLocation)).toInt();
        g = (g * (1.0 - darkLocation)).toInt();
        b = (b * (1.0 - darkLocation)).toInt();
        
        colorValue.set(r, g, b);
        
  
negative.code:   // means the color, brightness and darkness sliders.
    void _colorChanged(ColorData stop) {
      color = stop.color;
      _colorLocation = stop.colorLocation;
      
      _brightnessSlider.backgroundStyle = "linear-gradient(to right, ${color.toString()}, #ffffff)";
      
  