click:     refresh

    a:         move mouse left/right 
    b: shift + move mouse left/right 
    c: ctrl  + move mouse left/right 
    d: alt   + move mouse left/right 

    color = rgba(a, b, c, d) with mapped domain
  

  
    a: -3.1107550624720695
    b: 1.9186578414341566
    c: -1.2660633298954258
    d: 0.6495497772973988