This reference is for Processing 2.0+. 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.

rect(30, 20, 50, 50);
boolean b = false;
if (b == false) {
  line(20, 10, 90, 80);  // This line is drawn
} else {
  line(20, 80, 90, 10);  // This line is not drawn
}