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index.html
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<html>
<head>
<title>Javascript Box - OOP demo</title>
</head>
<!-- Removed margin from body in order to fit the window size exactly -->
<body style="margin:0;">
<!-- Added inline css style for adjust size of the svg continer to the window size -->
<svg id="svg" xmlns="http://www.w3.org/2000/svg" style="width:100%;height:100%;"></svg>
<script>
// Added the redius parameter to create circles of different sizes based on the time the mouse was pressed
function Circle(cx, cy, r, html_id)
{
var html_id = html_id;
// Added the radius passed as an argument during the circle creation
this.info = { cx: cx, cy: cy, r: r };
//private function that generates a random number
var randomNumberBetween = function(min, max){
return Math.random()*(max-min) + min;
}
this.initialize = function(){
//give a random velocity for the circle
this.info.velocity = {
x: randomNumberBetween(-3,3),
y: randomNumberBetween(-3,3)
}
//create a circle
var circle = makeSVG('circle',
{ cx: this.info.cx,
cy: this.info.cy,
r: this.info.r, // redius is now dynamically added
id: html_id,
style: "fill: black"
});
document.getElementById('svg').appendChild(circle);
}
this.update = function(time){
var el = document.getElementById(html_id);
//see if the circle is going outside the browser. if it is, reverse the velocity.
// Adjusted the calculations to take into account the radius of the circles so the bounce works properly extracting the r property from the object.
if( this.info.cx > document.body.clientWidth - this.info.r || this.info.cx - this.info.r < 0)
{
this.info.velocity.x = this.info.velocity.x * -1;
}
if( this.info.cy > document.body.clientHeight - this.info.r || this.info.cy - this.info.r < 0)
{
this.info.velocity.y = this.info.velocity.y * -1;
}
this.info.cx = this.info.cx + this.info.velocity.x*time;
this.info.cy = this.info.cy + this.info.velocity.y*time;
el.setAttribute("cx", this.info.cx);
el.setAttribute("cy", this.info.cy);
}
//creates the SVG element and returns it
var makeSVG = function(tag, attrs) {
var el= document.createElementNS('http://www.w3.org/2000/svg', tag);
for (var k in attrs)
{
el.setAttribute(k, attrs[k]);
}
return el;
}
this.initialize();
}
function PlayGround()
{
var counter = 0; //counts the number of circles created
var circles = [ ]; //array that will hold all the circles created in the app
//a loop that updates the circle's position on the screen
this.loop = function(){
for(circle in circles)
{
circles[circle].update(1);
// console.log(circles[circle].info.cx);
}
for(circle in circles)
{
x1 = circles[circle].info.cx;
y1 = circles[circle].info.cy;
// console.log(circle);
for (var i = circle * 1 + 1; i < circles.length; i++) {
x2 = circles[i].info.cx;
y2 = circles[i].info.cy;
if ( (circles[circle].info.r + circles[i].info.r) > Math.sqrt(Math.pow((x1 - x2),2)+Math.pow((y1 - y2),2)) ) {
vx1 = circles[circle].info.velocity.x;
vy1 = circles[circle].info.velocity.y;
vx2 = circles[i].info.velocity.x;
vy2 = circles[i].info.velocity.y;
m1 = circles[circle].info.r*1;
m2 = circles[i].info.r*1;
newVelX1 = (vx1 * (m1 - m2) + (2 * m2 * vx2)) / (m1 + m2);
newVelY1 = (vy1 * (m1 - m2) + (2 * m2 * vy2)) / (m1 + m2);
newVelX2 = (vx2 * (m2 - m1) + (2 * m1 * vx1)) / (m1 + m2);
newVelY2 = (vy2 * (m2 - m1) + (2 * m1 * vy1)) / (m1 + m2);
circles[circle].info.velocity.x = newVelX1;
circles[circle].info.velocity.y = newVelY1;
circles[i].info.velocity.x = newVelX2;
circles[i].info.velocity.y = newVelY2;
}
}
}
}
// Added the redius parameter to create circles of different sizes based on the time the mouse was pressed
this.createNewCircle = function(x,y,r){
var new_circle = new Circle(x,y,r,counter++);
circles.push(new_circle);
// console.log('created a new circle!', new_circle);
}
//create one circle when the game starts
// Added the redius parameter to create circles of different sizes based on the time the mouse was pressed
this.createNewCircle(document.body.clientWidth/2, document.body.clientHeight/2,10);
}
var mousedown_time;
var playground = new PlayGround();
function getTime(){
var date = new Date();
return date.getTime();
}
document.onmousedown = function(e){
mousedown_time = getTime();
}
document.onmouseup = function(e) {
// Calculate the time the mouse was pressed
time_pressed = getTime() - mousedown_time;
// Selecting the radius depending on the time the mouse was pressed
if (time_pressed<100) {
radius = 10;
}
else if (time_pressed<150) {
radius = 15;
}
else if (time_pressed<200) {
radius = 20;
}
else if (time_pressed<250) {
radius = 25;
}
else if (time_pressed<300) {
radius = 30;
}
else if (time_pressed<350) {
radius = 35;
}
else if (time_pressed<400) {
radius = 40;
}
else if (time_pressed<450) {
radius = 45;
}
else {
radius = 50;
}
// Added the redius parameter to create circles of different sizes based on the time the mouse was pressed
playground.createNewCircle(e.x,e.y,radius);
}
setInterval(playground.loop, 15);
</script>
</body>
</html>