Hypocycloid


interface Inputs {
  float getAValue();
  float getBValue();
  boolean getCanClear();
}

Inputs inputs;

void setup(){
  size(400, 400);
  background(255);
}

float theta = 0.0;
void draw(){
  if (inputs != null) {
    if (inputs.getCanClear()) {
      theta = 0.0;
      background(255);
    }
  
    theta = theta + .05;
    float a = inputs.getAValue();
    float b = inputs.getBValue();
    stroke(100,0,0);
    float x = (a-b)*cos(theta) + (b*cos(((a-b)/b)*theta));
    float y = (a-b)*sin(theta) - (b*sin(((a-b)/b)*theta));
    translate(150, 150);
    point(x, y);
  }
}

void bindInputsJS(Inputs inputs){
  this.inputs = inputs;
}