This example is for Processing 3+. If you have a previous version, use the examples included with your software. If you see any errors or have suggestions, please let us know.

Width and Height.

The 'width' and 'height' variables contain the width and height of the display window as defined in the size() function.

void setup() {
  size(640, 360);

void draw() {
  for (int i = 0; i < height; i += 20) {
    fill(129, 206, 15);
    rect(0, i, width, 10);
    rect(i, 0, 10, height);