Teclado p5.js | teclaIsPressed

La variable keyIsPressed en p5.js es verdadera si se presiona alguna tecla y falsa si no se presiona ninguna tecla . Sintaxis:

keyIsPressed

El siguiente programa ilustra la variable keyIsPressed en p5.js: Ejemplo-1: 

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);
    }
 
}

Salida: Antes: Después: Ejemplo-2: 

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);
    }
}

Salida: Antes: Después: Referencia: https://p5js.org/reference/#/p5/keyIsPressed