a port of the Processing Visualization Language


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

Original Processing.org 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() 



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