let x = 50;

let y= 50;

​

// Code to create a 400x400 canvas

function setup() {

createCanvas(400, 400);

​

// Code to draw a gray background

background(220);

}

​

// Code to draw the shape

function draw() {

rect(x, y, 50, 50);

​

​

// Code that describes mouse interaction

if(mouseX > x && mouseX < x + 50) {

  x = mouseX;

}

// Code that changes the position of the shape over time

x++;

}

​

​