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: -2.6723164034581606
    b: 1.2342256112331826
    c: -1.7550920570601987
    d: 1.5020700066151953