// Exercise 061 - Curve
// Conchoid of Nicomedes
// Paul Bartlett

float x,y;
float r, theta;
float a;
float b = 50;
float res = 500.0;

void setup(){
  size(640,480);
  smooth();
  strokeWeight(0.4);
}

void draw(){
  background(255,255,102);
  fill(80);
  rect(0,300,width,300);

   a = 55*pow(sin(0.0005*millis()),3);
  //a = 55*sin(0.001*millis());

  for(int t=0; t<2.0*PI*res; t++){
    r = b+a/cos(t/res);
    x = r*sin(t/res);
    y = -r*cos(t/res);
    if (y+300>300){
      stroke(255,255,102);
    }
    else{
      stroke(80);
    }
    point(x+width/2,y+300);
  }


}