The redraw() function makes draw() execute once. In this example, draw() is executed once every time the mouse is clicked.

Original Example: Redraw

// All Examples Written by Casey Reas and Ben Fry
// unless otherwise stated.
// The statements in the setup() function 
// execute once when the program begins
void setup() 
  size(200, 200);  // Size should be the first statement
  stroke(255);     // Set line drawing color to white

float y = 100;

// The statements in draw() are executed until the 
// program is stopped. Each statement is executed in 
// sequence and after the last line is read, the first 
// line is executed again.
void draw() 
  background(0);   // Set the background to black
  y = y - 1; 
  if (y < 0) { y = height; } 
  line(0, y, width, y);  

void mousePressed()