Reference for Processing version 1.5. 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.

Name

### noLoop()

Examples

    void setup() {
      size(200, 200);
      noLoop();
    }

    void draw() {
      line(10, 10, 190, 190);
    }

    void setup() {
      size(200, 200);
    }

    float x = 0.0;

    void draw() {
      background(204);
      x = x + 0.1;
      if (x > width) {
        x = 0;
      }
      line(x, 0, x, height);
    }

    void mousePressed() {
      noLoop();
    }

    void mouseReleased() {
      loop();
    }

Description

Stops Processing from continuously executing the code within draw(). If loop() is called, the code in draw() begin to run continuously again. If using noLoop() in setup(), it should be the last line inside the block.
When noLoop() is used, it's not possible to manipulate or access the screen inside event handling functions such as mousePressed() or keyPressed(). Instead, use those functions to call redraw() or loop(), which will run draw(), which can update the screen properly. This means that when noLoop() has been called, no drawing can happen, and functions like saveFrame() or loadPixels() may not be used.
Note that if the sketch is resized, redraw() will be called to update the sketch, even after noLoop() has been specified. Otherwise, the sketch would enter an odd state until loop() was called.

Syntax

    noLoop()

Returns | None
Usage | Web & Application
Related | loop() redraw() draw()

Updated on August 30, 2010 04:29:39pm EDT