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HTML

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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                
<html>
  <head>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.6.1/p5.min.js"></script>
     <script src="https://cdn.jsdelivr.net/gh/molleindustria/p5.play/lib/p5.play.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.6.1/addons/p5.dom.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/tone/13.8.12/Tone.min.js"></script>
    <link rel="stylesheet" type="text/css" href="style.css">
    <meta charset="utf-8" />

  </head>
  <body>
    <script src="sketch.js"></script>
  </body>
</html>
!

CSS 

              
                html, body {
  margin: 0;
  padding: 0;
}
!

JS 

              
                //code by Matthew A. Bardin [2020]

//variables that wil help draw the numbers to the screen
let xLocation, yLocation;

function setup() {
  createCanvas(800, 600);
  background(220);
}

function draw() {
//draws grid on the canvas
  drawGrid();
  
  //puts the square on the bottom corner
  fill(255);
  rect(width - 90, height - 70, width, height);

  //deals with adjusting the numbers present in the X,Y location square
  xLocation = mouseX;
  yLocation = mouseY;
  fill(0);
  textSize(20);
  text("X:", 720, 560);
  text("Y:", 760, 560);
  text(xLocation, 720, 590);
  text(yLocation, 760, 590);

}

//seperate function that draws the grid to the canvas
function drawGrid() {
  textSize(10);
  stroke(200);
  fill(120);
  for (let x = -width; x < width; x += 40) {
    line(x, -height, x, height);
    text(x, x + 1, 12);
  }
  for (let y = -height; y < height; y += 40) {
    line(-width, y, width, y);
    fill(255, 100, 0);
    text(y, 1, y + 12);
  }
}


//seperate function to draw the marked circles whenever the mouse is clicked.
function mousePressed() {
  //draws the circles

  fill(255, 0, 0);
  ellipse(mouseX, mouseY, 40);
  fill(0, 255, 0);
  ellipse(mouseX, mouseY, 30);
  fill(0, 0, 255);
  ellipse(mouseX, mouseY, 20);
  fill(255, 0, 255);
  ellipse(mouseX, mouseY, 10);


  //writes the numbers
  textSize(15);
  fill(0);
  text(xLocation, mouseX + 22, mouseY + 25);
  text(yLocation, mouseX + 50, mouseY + 25);
}
!
999px

Console