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

### redraw()

Examples

    float x = 0;

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

    void draw() {
      background(204);
      line(x, 0, x, height);
    }

    void mousePressed() {
      x += 1;
      redraw();
    }

Description

Executes the code within draw() one time. This functions allows the program to update the display window only when necessary, for example when an event registered by mousePressed() or keyPressed() occurs.
In structuring a program, it only makes sense to call redraw() within events such as mousePressed(). This is because redraw() does not run draw() immediately (it only sets a flag that indicates an update is needed).
Calling redraw() within draw() has no effect because draw() is continuously called anyway.

Syntax

    redraw()

Returns | None
Usage | Web & Application
Related | noLoop() loop()

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