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

### updatePixels()

Examples

    int halfImage = width*height/2;
    PImage myImage = loadImage("topanga.jpg");
    image(myImage, 0, 0);

    loadPixels();
    for (int i = 0; i < halfImage; i++) {
      pixels[i+halfImage] = pixels[i];
    }
    updatePixels();

    int halfImage = width*height/2;
    PImage myImage = loadImage("towerFlip.jpg");
    image(myImage, 0, 0);

    loadPixels();
    for (int i = 0; i < halfImage; i++) {
      pixels[i+halfImage] = pixels[i];
    }
    updatePixels(50, 0, 50, 100);

Description

Updates the display window with the data in the pixels[] array. Use in conjunction with loadPixels(). If you're only reading pixels from the array, there's no need to call updatePixels() unless there are changes.
Certain renderers may or may not seem to require loadPixels() or updatePixels(). However, the rule is that any time you want to manipulate the pixels[] array, you must first call loadPixels(), and after changes have been made, call updatePixels(). Even if the renderer may not seem to use this function in the current Processing release, this will always be subject to change.
Currently, none of the renderers use the additional parameters to updatePixels(), however this may be implemented in the future.

Syntax

    updatePixels()
    updatePixels(x, y, w, h)

Usage | Web & Application
Related | pixels[] loadPixels()

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