How to translate a math equation in processing ?

lbolli

Hello, I'm new in processing. I'm trying to create a variation on Fermat spiral based on an equation and then export it in PDF. I have the code to create a Fermat spiral (several existing example exist) but I can't control it as I would do using an equation. I was wondering if there is a way to simply "translate" an equation into processing ?

Thanks for your tips and help !

koogs

void setup() {
  size(500, 500);
  noLoop(); 
}

void draw() {
  translate(width / 2, height / 2); // centre origin
  strokeWeight(.1);
  scale(25);

  for (float u = 0 ; u < 10 * PI ; u += .1) {
    // cube root is same as raising to power of 1/3 so...
    // the 100/55th root is same as raising to power of 55/100
    float x = pow(u, .55) * cos(u);
    float y = pow(u, .55) * sin(u);
    point(x, y);
  }
}

lbolli

Impressive, many thanks !!

jeremydouglass

If you are dealing a lot with evaluating mathematical expressions in the future, @Quark 's QScript also supports mathematical expression evaluation.

quark

The Jasmine library is faster than QScript for evaluating mathematical equations.

In this case, both these libraries are a bit over-the-top, and I would go with koogs code.

lbolli

@quark @jeremydouglass: Thank you for your relevant answers. I will certainly try the solutions you proposed.