p5.js width variable

The width variable in p5.js is a system variable that stores the width of the drawing canvas. This value is automatically initialised by the first parameter of the createCanvas() function as soon as the code is executed.

Syntax:

width

Parameters: This function does not accept any parameter.

Below program illustrates the width variable in p5.js:
Example-1:

function setup() {

    //create Canvas of size 380*80
    createCanvas(380, 80);
}

function draw() {

    // set background color
    background(220);

    // set text size
    textSize(16);

    // set the text alignment
    textAlign(CENTER);

    //set the fill color
    fill(color('Green'));

    //use of width variable
    text("Width of Canvas is : "
         + width, 180, 50);
}

Output:

Example-2:

function setup() {

    //create Canvas of size 380*80
    width = windowWidth;
    createCanvas(width, 80);
}

function draw() {
    // set background color
    background(220);

    // set text size
    textSize(16);

    // set the text alignment
    textAlign(CENTER);

    //set the fill color
    fill(color('Green'));

    //use of width variable
    text("Width of Canvas is equal to windowWidth i.e. : "
         + width, 180, 50);
}

Output:

Reference: https://p5js.org/reference/#/p5/width