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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://cdnjs.cloudflare.com/ajax/libs/p5.js/0.6.1/addons/p5.dom.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.6.1/addons/p5.sound.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 

              
                /* PDM Course: Graphics Unit

Click Test - Measuring Boundaries of Moving Shapes

Code by Anthony T. Marasco [2019]
*/

let circX = 80;
let circY = 200;
let rectX = 0;
let rectY = 40;
let circDiam = 100;
let backColor = "lightGray";
let d, circR;

function setup() {
  createCanvas(windowWidth, 600);
  circR = circDiam / 2;
}

function draw() {

  d = dist(circX, circY, mouseX, mouseY);
  
  rectX = frameCount % 300;
  //add 40 to circX with each loop to keep it inline with the square
  circX = (frameCount % 300) + 40;
  
  
  if(mouseIsPressed && (mouseX > rectX) && (mouseX < rectX + 80) && (mouseY > rectY) && (mouseY < rectY+80)){
    backColor = "orange";
    } else if (mouseIsPressed && (d < circR)){
      backColor = "yellow";
    }else {
 backColor = "gray";
    }
  background(backColor);
  
  
  /*Reassign rectX with the new result of 
 frameCount mod 300 on each draw() loop
 */
 
  fill("purple");
  rect(rectX, rectY, 80, 80);

  fill("green");
  ellipse(circX, circY, circDiam, circDiam);
}
!
999px

Console