Reference for Processing version 1.2. If you have a previous version, use the reference included with your software. If you see any errors or have suggestions, please let us know. If you prefer a more technical reference, visit the Processing Javadoc.

import processing.pdf.*;

void setup() {
  size(400, 400);
  beginRecord(PDF, "everything.pdf");
}

void draw() {
  ellipse(mouseX, mouseY, 10, 10);
}

void mousePressed() {
  endRecord();
  exit();
}

endRecord()