JSXGraph/test.js at main · LiaTemplates/JSXGraph · GitHub

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JXG.Options.slider.snapValues = [-5, -2, -1, 0, 1, 2, 5]
JXG.Options.slider.snapValueDistance = 0.2

var a = board.create(
  'slider',
  [
    [2, -5],
    [7, -5],
    [-5, 1, 5],
  ],
  { name: 'a' }
)
var b = board.create(
  'slider',
  [
    [2, -6],
    [7, -6],
    [-5, 0, 5],
  ],
  { name: 'b' }
)
var c = board.create(
  'slider',
  [
    [2, -7],
    [7, -7],
    [-5, 0, 5],
  ],
  { name: 'c' }
)

var f = board.create('functiongraph', [
  (x) => a.Value() * x * x + b.Value() * x + c.Value(),
])

var txt = board.create(
  'text',
  [
    -9,
    -5,
    () =>
      JXG.Math.Numerics.generatePolynomialTerm(
        [c.Value(), b.Value(), a.Value()],
        2,
        'x',
        2
      ),
  ],
  { fontSize: 18 }
)