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: -2.616758867143721
    b: 2.2584714041778415
    c: 0.7384779316842871
    d: -1.683629695956581