This reference is for Processing 3.0+. If you have a previous version, use the reference included with your software in the Help menu. If you see any errors or have suggestions, please let us know. If you prefer a more technical reference, visit the Processing Core Javadoc and Libraries Javadoc.



void draw() {
  line(mouseX, mouseY, 50, 50);

void mousePressed() {
Description Quits/stops/exits the program. Programs without a draw() function stop automatically after the last line has run, but programs with draw() run continuously until the program is manually stopped or exit() is run.

Rather than terminating immediately, exit() will cause the sketch to exit after draw() has completed (or after setup() completes if called during the setup() function).

For Java programmers, this is not the same as System.exit(). Further, System.exit() should not be used because closing out an application while draw() is running may cause a crash (particularly with P3D).
Updated on June 6, 2020 10:05:46pm EDT