p5.js Keyboard keyIsPressed

The keyIsPressed variable in p5.js is true if any key is pressed and false if no keys are pressed. 

Syntax:

keyIsPressed

The below program illustrates the key is pressed variable in p5.js.

Example-1:

javascript

let valueX;
let valueY;

function setup() {
    // Create Canvas of size 500*500
    createCanvas(1000, 500);
}

function draw() {

    // set background color
    background(200);
    fill('green');

    // set text and text size
    textSize(25);

    text('Press Key to change the figure '+
         'from Circle To Keyboard', 30, 30);

    // use of keyIsPressed Variable
    if (keyIsPressed) {
        // draw ellipse
        ellipse(mouseX, mouseY, 115, 115);
        fill('red');
        text("Key Is Pressed", 100, 300);
    } else {
        rect(mouseX / 2, mouseY / 2, 300, 200);
    }

};

Output:

Before:

After:

Example-2:

javascript

let valueX;
let valueY;

function setup() {

    // Create Canvas of size 500*500
    createCanvas(500, 500);
}

function draw() {

    // set background color
    background(200);

    fill('green');

    // set text and text size
    textSize(25);
    text('Click to flip the figure', 30, 30);

    // use of KeyIsPressed
    if (keyIsPressed) {
        fill(valueX, 255 - valueY, 255 - valueX);

        // draw rectangle
        rect(mouseX, mouseY, 115, 115);
        fill(valueY, 255 - valueX, 255 - valueX);

        rect(mouseX, mouseY + 115, 115, 115);
        fill(255 - valueY, 255 - valueX, 255 - valueY);
    } else {
        rect(mouseX - 115, mouseY, 115, 115);
        fill(255 - valueY, 255 - valueY, 255 - valueY);

        rect(mouseX - 115, mouseY + 115, 115, 115);
    }
};

Output: Before:

After:

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