Custom variable names in equations

[ghost]

Hi @Maurizzzio, thanks for very useful library!

I watched all previous issues and read all documentation, but I don't found and I don't understand how can I replace the predefined variable names (theta for polar equation or x for linear equation etc.).

Let's say, I want the input to be 2cos(a) instead of 2cos(theta). I know how to define additional variables for equation via scope object, but it's not working for me there.

Thanks!

[mauriciopoppe]

Unfortunately for some functions the variable to be used is already defined e.g. for polar equations the variable used is theta, if you want to use other variables in the definition you can always use a function instead of a string e.g.

functionPlot({
  target: '#demo',
  yAxis: {domain: [-1.897959183, 1.897959183]},
  xAxis: {domain: [-3, 3]},
  data: [{
    r: function (scope) {
      const r0 = 0
      const a = 0.5
      const gamma = 0
      const theta = scope.theta
      return r0 * Math.cos(theta - gamma) +
        Math.sqrt(a * a - r0 * r0 * Math.pow(Math.sin(theta - gamma), 2))
    },
//    r: 'r0 * cos(theta - gamma) + sqrt(a^2 - r0^2 * (sin(theta - gamma))^2)',
    fnType: 'polar',
    graphType: 'polyline'
  }]
})

[ghost]

Okay, now it's clear for me.

Thanks for reply!)