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index.js
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let resizeReset = function() {
w = canvasBody.width = window.innerWidth;
h = canvasBody.height = window.innerHeight;
}
const opts = {
particleColor: "rgb(82, 255, 29)",
lineColor: "rgb(125, 238, 153)",
particleAmount: 10,
defaultSpeed: .6,
variantSpeed: 0.8,
defaultRadius: .6,
variantRadius: 3,
linkRadius: 200,
};
window.addEventListener("resize", function(){
deBouncer();
});
let deBouncer = function() {
clearTimeout(tid);
tid = setTimeout(function() {
resizeReset();
}, delay);
};
let checkDistance = function(x1, y1, x2, y2){
return Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2));
};
let linkPoints = function(point1, hubs){
for (let i = 0; i < hubs.length; i++) {
let distance = checkDistance(point1.x, point1.y, hubs[i].x, hubs[i].y);
let opacity = 1 - distance / opts.linkRadius;
if (opacity > 0) {
drawArea.lineWidth = 1;
drawArea.strokeStyle = `rgba(${rgb[0]}, ${rgb[1]}, ${rgb[2]}, ${opacity})`;
drawArea.beginPath();
drawArea.moveTo(point1.x, point1.y);
drawArea.lineTo(hubs[i].x, hubs[i].y);
drawArea.closePath();
drawArea.stroke();
}
}
}
Particle = function(xPos, yPos){
this.x = Math.random() * w;
this.y = Math.random() * h;
this.speed = opts.defaultSpeed + Math.random() * opts.variantSpeed;
this.directionAngle = Math.floor(Math.random() * 360);
this.color = opts.particleColor;
this.radius = opts.defaultRadius + Math.random() * opts. variantRadius;
this.vector = {
x: Math.cos(this.directionAngle) * this.speed,
y: Math.sin(this.directionAngle) * this.speed
};
this.update = function(){
this.border();
this.x += this.vector.x;
this.y += this.vector.y;
};
this.border = function(){
if (this.x >= w || this.x <= 0) {
this.vector.x *= -1;
}
if (this.y >= h || this.y <= 0) {
this.vector.y *= -1;
}
if (this.x > w) this.x = w;
if (this.y > h) this.y = h;
if (this.x < 0) this.x = 0;
if (this.y < 0) this.y = 0;
};
this.draw = function(){
drawArea.beginPath();
drawArea.arc(this.x, this.y, this.radius, 0, Math.PI*3);
drawArea.closePath();
drawArea.fillStyle = this.color;
drawArea.fill();
};
};
function setup(){
particles = [];
resizeReset();
for (let i = 0; i < opts.particleAmount; i++){
particles.push( new Particle() );
}
window.requestAnimationFrame(loop);
}
function loop(){
window.requestAnimationFrame(loop);
drawArea.clearRect(0,0,w,h);
for (let i = 0; i < particles.length; i++){
particles[i].update();
particles[i].draw();
}
for (let i = 0; i < particles.length; i++){
linkPoints(particles[i], particles);
}
}
const canvasBody = document.getElementById("canvas"),
drawArea = canvasBody.getContext("2d");
let delay = 1000, tid,
rgb = opts.lineColor.match(/\d+/g);
resizeReset();
setup();