// Sine_Cosine 
// by REAS <http://reas.com> 

 
int i = 45; 
int j = 225; 
float pos1 = 0; 
float pos2 = 0; 
float pos3 = 0; 
float pos4 = 0; 
int sc = 40; 
 
void setup() 
{ 
  size(200, 200); 
  noStroke(); 
  smooth(); 
  framerate(60); 
} 
 
void draw() 
{ 
  background(0); 
  
  fill(51); 
  rect(60, 60, 80, 80); 
 
  fill(255); 
  ellipse(pos1, 36, 32, 32); 
 
  fill(153); 
  ellipse(36, pos2, 32, 32); 
 
  fill(255); 
  ellipse(pos3, 164, 32, 32); 
 
  fill(153); 
  ellipse(164, pos4, 32, 32); 
 
  i += 3; 
  j -= 3; 
 
  if(i > 405) { 
    i = 45; 
    j = 225; 
  } 
 
  float ang1 = radians(i); // convert degrees to radians 
  float ang2 = radians(j); // convert degrees to radians 
  pos1 = width/2 + (sc * cos(ang1)); 
  pos2 = width/2 + (sc * sin(ang1)); 
  pos3 = width/2 + (sc * cos(ang2)); 
  pos4 = width/2 + (sc * sin(ang2)); 
}