js6450.github.io/bouncingBall.html at master · js6450/js6450.github.io · GitHub

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<!DOCTYPE html>
<html>
<head>
	<title></title>
	<!--https://cdnjs.com/libraries/p5.js-->
	<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.5.16/p5.min.js" type="text/javascript"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.5.16/addons/p5.sound.min.js" type="text/javascript"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.5.16/addons/p5.dom.min.js" type="text/javascript"></script>

</head>
<style type="text/css">
	html, body{
		margin: 0;
		overflow: hidden;
	}
</style>
<body>

</body>
<script type="text/javascript">
	//https://p5js.org/reference/
	"use strict";

	var MAX_NUM = 200;
	var circles= [];

	function setup(){
		createCanvas(window.innerWidth, window.innerHeight);
		background(0);

		noStroke();
	}

	function draw(){
		background(0, 50);

		for(var i = 0; i < circles.length; i++){
			circles[i].checkBoundary();
			circles[i].update();
			circles[i].display();
		}
	}

	function mouseClicked(){
		if(circles.length < MAX_NUM){
			for(var i = 0; i < 5; i++){
				circles.push(new Circle(mouseX, mouseY));
			}
		}
	}

	function keyPressed(){
		if(key == " "){
			for(var i = 0; i < circles.length; i++){
				circles[i].speedX = random(-5, 5) * 2;
				circles[i].speedY = random(-5, 5) * 2;
			}
		}
	}

	function Circle(x, y){
		this.x = x;
		this.y = y;
		this.speedX = random(-5, 5);
		this.speedY = random(-5, 5);
		this.size = random(25, 50);
		this.color = color(random(255), random(255), random(255), 100);

		this.checkBoundary = function(){
			if(this.x < 0){
				this.x = 0;
				this.speedX *= -1;
			}
			if(this.x > width){
				this.x = width;
				this.speedX *= -1;
			}
			if(this.y < 0){
				this.y = 0;
				this.speedY *= -1;
			}
			if(this.y > height){
				this.y = height;
				this.speedY *= -1;
			}
		}

		this.update = function(){
			//restitution
			this.speedX *= 0.98;
			this.speedY *= 0.98;
			this.x += this.speedX;
			this.y += this.speedY;
		}

		this.display = function(){
			push();
			fill(this.color);
			ellipse(this.x, this.y, this.size, this.size);
			pop();
		}
	}
</script>
</html>