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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

              
                //Objects and Classes 6: Programming Digital Media

//Code by Matthew A. Bardin [2020]

//we will start by changing the objects back into blank variable.
let circle1
let circle2
/*
let circle1 = {
  x: 100,
  y: 100,
  diam: 50
};


let circle2 = {
  x: 200,
  y: 300,
  diam: 50
};
*/
function setup() {
  createCanvas(400, 400);
  circle1 = new Circle();//in this line we are creating a new object within a class. new is a keyword that will generate a unique instance of this class and store it within the given variable. the name of the variable will replace the keyword 'this' later on in the code.

}

function draw() {
  background(220, 200, 0);
  circle1.appear();
  circle1.move();

/*
  fill('green');
  ellipse(circle2.x, circle2.y, circle2.diam, circle2.diam);
*/
}

// here is where we are defining the class Circle(). This can be located anywhere within your code as long as it is not in another function. This will contain two main important sections: construction and functionality.
class Circle {
  //in this section we will define everything that makes up the object that we will eventiually make. notice the keyword 'this'. 'this' is used to say that whatever object will be made, the name will replace 'this' and be used to generate an object with the properties. 

  // think of it like you are generating a template to create new objects, and you are creating the presets. However because this is not the object itself, but rather the default values to be applied to the objects later, you don't know the name to put in yet.
  constructor() {
    this.x = 25;
    this.y = 100;
    this.diam = 50;
    this.moveDir = 1;
  }

  // when we are setting up the class, we can also define how the objects will behave. We can format this like a function, however we do not need the keyword function. What we do need is the keyword 'this' 
  move() {
    this.x = this.x + this.moveDir;
    
    if(this.x >= width - 25){
     this.moveDir = -1;
    } else if (this.x <= 25)
     this.moveDir = 1;
  }

  appear() {
    fill('purple');
    ellipse(this.x, this.y, this.diam, this.diam);
  }
}
              
            
!
999px

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