// Noise1D 
// Daniel Shiffman <http://www.shiffman.net> 

float xoff = 0.0; 
float xincrement = 0.01; 
 
void setup() { 
  size(200,200); 
  background(0); 
  framerate(30); 
  smooth(); 
  noStroke(); 
} 
 
void draw() 
{ 
  // Create an alpha blended background 
  fill(0, 10); 
  rect(0,0,width,height); 
  
  //float n = random(0,width);  // Try this line instead of noise 
  
  // Get a noise value based on xoff and scale it according to the window's width 
  float n = noise(xoff)*width; 
  
  // With each cycle, increment xoff 
  xoff += xincrement; 
  
  // Draw the ellipse at the value produced by perlin noise 
  fill(200); 
  ellipse(n,height/2,16,16); 
}