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.

Name

setup()
Examples
int x = 0;

void setup() {
  size(200, 200);
  background(0);
  noStroke();
  fill(102);
}

void draw() {
  rect(x, 10, 2, 80); 
  x = x + 1;
}

int x = 0;

void setup() {
  fullScreen();
  background(0);
  noStroke();
  fill(102);
}

void draw() {
  rect(x, height*0.2, 1, height*0.6); 
  x = x + 2;
}
Description The setup() function is run once, when the program starts. It's used to define initial enviroment properties such as screen size and to load media such as images and fonts as the program starts. There can only be one setup() function for each program and it shouldn't be called again after its initial execution.

If the sketch is a different dimension than the default, the size() function or fullScreen() function must be the first line in setup().

Note: Variables declared within setup() are not accessible within other functions, including draw().
Syntax
setup()
Returnsvoid
Relatedsize()
loop()
noLoop()
draw()
Updated on January 21, 2019 10:05:09am EST

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