<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
<div class="row">
<canvas id="nokey" width="800" height="800">
</canvas>
</div>
</div>
*{
-webkit-box-sizing: border-box;
box-sizing: border-box;
}
html, body{
height: 100%;
margin: 0;
padding: 0;
background-color: #333;
overflow: hidden;
}
canvas{
background-color: #000;
}
var canvas = document.getElementById('nokey'),
can_w = parseInt(canvas.getAttribute('width')),
can_h = parseInt(canvas.getAttribute('height')),
ctx = canvas.getContext('2d');
// console.log(typeof can_w);
var ball = {
x: 0,
y: 0,
vx: 0,
vy: 0,
r: 0,
alpha: 1,
phase: 0
},
ball_color = {
r: 207,
g: 255,
b: 4
},
R = 2,
balls = [],
alpha_f = 0.03,
alpha_phase = 0,
// Line
link_line_width = 0.8,
dis_limit = 260,
add_mouse_point = true,
mouse_in = false,
mouse_ball = {
x: 0,
y: 0,
vx: 0,
vy: 0,
r: 0,
type: 'mouse'
};
// Random speed
function getRandomSpeed(pos){
var min = -1,
max = 1;
switch(pos){
case 'top':
return [randomNumFrom(min, max), randomNumFrom(0.1, max)];
break;
case 'right':
return [randomNumFrom(min, -0.1), randomNumFrom(min, max)];
break;
case 'bottom':
return [randomNumFrom(min, max), randomNumFrom(min, -0.1)];
break;
case 'left':
return [randomNumFrom(0.1, max), randomNumFrom(min, max)];
break;
default:
return;
break;
}
}
function randomArrayItem(arr){
return arr[Math.floor(Math.random() * arr.length)];
}
function randomNumFrom(min, max){
return Math.random()*(max - min) + min;
}
console.log(randomNumFrom(0, 10));
// Random Ball
function getRandomBall(){
var pos = randomArrayItem(['top', 'right', 'bottom', 'left']);
switch(pos){
case 'top':
return {
x: randomSidePos(can_w),
y: -R,
vx: getRandomSpeed('top')[0],
vy: getRandomSpeed('top')[1],
r: R,
alpha: 1,
phase: randomNumFrom(0, 10)
}
break;
case 'right':
return {
x: can_w + R,
y: randomSidePos(can_h),
vx: getRandomSpeed('right')[0],
vy: getRandomSpeed('right')[1],
r: R,
alpha: 1,
phase: randomNumFrom(0, 10)
}
break;
case 'bottom':
return {
x: randomSidePos(can_w),
y: can_h + R,
vx: getRandomSpeed('bottom')[0],
vy: getRandomSpeed('bottom')[1],
r: R,
alpha: 1,
phase: randomNumFrom(0, 10)
}
break;
case 'left':
return {
x: -R,
y: randomSidePos(can_h),
vx: getRandomSpeed('left')[0],
vy: getRandomSpeed('left')[1],
r: R,
alpha: 1,
phase: randomNumFrom(0, 10)
}
break;
}
}
function randomSidePos(length){
return Math.ceil(Math.random() * length);
}
// Draw Ball
function renderBalls(){
Array.prototype.forEach.call(balls, function(b){
if(!b.hasOwnProperty('type')){
ctx.fillStyle = 'rgba('+ball_color.r+','+ball_color.g+','+ball_color.b+','+b.alpha+')';
ctx.beginPath();
ctx.arc(b.x, b.y, R, 0, Math.PI*2, true);
ctx.closePath();
ctx.fill();
}
});
}
// Update balls
function updateBalls(){
var new_balls = [];
Array.prototype.forEach.call(balls, function(b){
b.x += b.vx;
b.y += b.vy;
if(b.x > -(50) && b.x < (can_w+50) && b.y > -(50) && b.y < (can_h+50)){
new_balls.push(b);
}
// alpha change
b.phase += alpha_f;
b.alpha = Math.abs(Math.cos(b.phase));
// console.log(b.alpha);
});
balls = new_balls.slice(0);
}
// loop alpha
function loopAlphaInf(){
}
// Draw lines
function renderLines(){
var fraction, alpha;
for (var i = 0; i < balls.length; i++) {
for (var j = i + 1; j < balls.length; j++) {
fraction = getDisOf(balls[i], balls[j]) / dis_limit;
if(fraction < 1){
alpha = (1 - fraction).toString();
ctx.strokeStyle = 'rgba(150,150,150,'+alpha+')';
ctx.lineWidth = link_line_width;
ctx.beginPath();
ctx.moveTo(balls[i].x, balls[i].y);
ctx.lineTo(balls[j].x, balls[j].y);
ctx.stroke();
ctx.closePath();
}
}
}
}
// calculate distance between two points
function getDisOf(b1, b2){
var delta_x = Math.abs(b1.x - b2.x),
delta_y = Math.abs(b1.y - b2.y);
return Math.sqrt(delta_x*delta_x + delta_y*delta_y);
}
// add balls if there a little balls
function addBallIfy(){
if(balls.length < 20){
balls.push(getRandomBall());
}
}
// Render
function render(){
ctx.clearRect(0, 0, can_w, can_h);
renderBalls();
renderLines();
updateBalls();
addBallIfy();
window.requestAnimationFrame(render);
}
// Init Balls
function initBalls(num){
for(var i = 1; i <= num; i++){
balls.push({
x: randomSidePos(can_w),
y: randomSidePos(can_h),
vx: getRandomSpeed('top')[0],
vy: getRandomSpeed('top')[1],
r: R,
alpha: 1,
phase: randomNumFrom(0, 10)
});
}
}
// Init Canvas
function initCanvas(){
canvas.setAttribute('width', window.innerWidth);
canvas.setAttribute('height', window.innerHeight);
can_w = parseInt(canvas.getAttribute('width'));
can_h = parseInt(canvas.getAttribute('height'));
}
window.addEventListener('resize', function(e){
console.log('Window Resize...');
initCanvas();
});
function goMovie(){
initCanvas();
initBalls(20);
window.requestAnimationFrame(render);
}
goMovie();
// Mouse effect
canvas.addEventListener('mouseenter', function(){
console.log('mouseenter');
mouse_in = true;
balls.push(mouse_ball);
});
canvas.addEventListener('mouseleave', function(){
console.log('mouseleave');
mouse_in = false;
var new_balls = [];
Array.prototype.forEach.call(balls, function(b){
if(!b.hasOwnProperty('type')){
new_balls.push(b);
}
});
balls = new_balls.slice(0);
});
canvas.addEventListener('mousemove', function(e){
var e = e || window.event;
mouse_ball.x = e.pageX;
mouse_ball.y = e.pageY;
// console.log(mouse_ball);
});
