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void setup() {
  size(800, 800);
  //  println(rx);
  //  println(ry);
  //  println(float(ry)/rx);
}

float a = 0;
float l = 400;
int rx = int(random(100, 200));
int ry = int(random(100, 200));
float prev;
float current;
float x = cos(a)*l;
float y = sin(a)*l;
void draw() {
  background(0);
  translate(width/2, height/2);
  y = sin(a)*l;
  x = cos(a)*l;

  stroke(255);
  line(0, 0, x, y);
  strokeWeight(10);
  point(width/2, height/2);
  strokeWeight(1);
  a += PI/36;

  if (checkStatus(prev, curr, rx, ry)) {
    stroke(255);
  } else {
    stroke(0);
  }
  point(rx, ry);
  //  println(y/x);
}

boolean checkStatus(float prev, float curr, int x, int y) {
  float slope = float(ry)/rx;
  if (slope <= prev && slope >= curr || slope >= prev && slope <= curr) {
    return true;
  } else {
    return false;
  }
}