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

int maxSpeed; 
void setup() 
{ 
  size(200, 200); 
  background(102); 
  
  // Draw ellipses with their center specified by the first two 
  // paramenters to the ellipse() method 
  ellipseMode(CENTER); 
} 
 
void draw() 
{ 
  // Call the variableEllipse() method and send it the 
  // parameters for the current mouse position 
  // and the previous mouse position 
  variableEllipse(mouseX, mouseY, pmouseX, pmouseY); 
} 
 
 
// The simple method variableEllipse() was created specifically 
// for this program. It calculates the speed of the mouse 
// and draws a small ellipse if the mouse is moving slowly 
// and draws a large ellipse if the mouse is moving quickly 
 
void variableEllipse(int x, int y, int px, int py) 
{ 
  float speed = abs(x-px) + abs(y-py); 
  stroke(speed); 
  ellipse(x, y, speed, speed); 
}