283 lines
10 KiB
JavaScript
283 lines
10 KiB
JavaScript
function particles(){
|
|
/* create particles animation
|
|
based on the amazing tutorial by 'Franks Labratory'
|
|
https://youtu.be/d620nV6bp0A
|
|
*/
|
|
|
|
// check parameters and use defaults as necessary
|
|
checkParams();
|
|
|
|
// read css colour variables from root element, set defaults as necessary
|
|
let particleColour;
|
|
let strokeColour;
|
|
let strokeHoverColour;
|
|
checkColours();
|
|
|
|
// get canvas element, set context and size
|
|
const canvas = document.getElementById('particles');
|
|
const canvasContext = canvas.getContext('2d');
|
|
canvas.width = window.innerWidth;
|
|
canvas.height = window.innerHeight;
|
|
|
|
let particlesArray;
|
|
speed = speed / 100; // index speed to base 100 = 1
|
|
|
|
// get mouse position
|
|
let mousePosition ={
|
|
x: undefined,
|
|
y: undefined,
|
|
radius: (canvas.height / 80) * (canvas.width / 80)
|
|
};
|
|
|
|
// add mouse position event listener
|
|
window.addEventListener('mousemove', function(event){
|
|
mousePosition.x = event.x;
|
|
mousePosition.y = event.y;
|
|
});
|
|
|
|
// create particle class
|
|
class Particle{
|
|
constructor(x, y, directionX, directionY, size, colour) {
|
|
this.x = x;
|
|
this.y = y;
|
|
this.directionX = directionX;
|
|
this.directionY = directionY;
|
|
this.size = size;
|
|
this.colour = colour;
|
|
}
|
|
// method to draw individual particles
|
|
draw(){
|
|
canvasContext.beginPath();
|
|
canvasContext.arc(this.x, this.y, this.size, 0, Math.PI * 2, false);
|
|
canvasContext.fillStyle = particleColour;
|
|
canvasContext.fill();
|
|
}
|
|
// check particle position, mouse position, move particle and draw it
|
|
update(){
|
|
// check if particle is still within canvas
|
|
if (this.x > canvas.width || this.x < 0){
|
|
this.directionX = -this.directionX;
|
|
}
|
|
if (this.y > canvas.height || this.y < 0){
|
|
this.directionY = -this.directionY;
|
|
}
|
|
|
|
// avoid the mouse if avoidMouse = true (default)
|
|
if (avoidMouse){
|
|
let dx = mousePosition.x - this.x;
|
|
let dy = mousePosition.y - this.y;
|
|
let distance = Math.sqrt((dx * dx) + (dy * dy));
|
|
if (distance < mousePosition.radius + this.size){
|
|
if (mousePosition.x < this.x && this.x < canvas.width - this.size * 10){
|
|
this.x += 10;
|
|
}
|
|
if (mousePosition.x > this.x && this.x > this.size * 10){
|
|
this.x -= 10;
|
|
}
|
|
if (mousePosition.y < this.y && this.y < canvas.height - this.size * 10){
|
|
this.y += 10;
|
|
}
|
|
if (mousePosition.y > this.y && this.y > this.size * 10){
|
|
this.y -= 10;
|
|
}
|
|
}
|
|
}
|
|
|
|
// move particle
|
|
this.x += this.directionX * speed;
|
|
this.y += this.directionY * speed;
|
|
|
|
// draw particle
|
|
this.draw();
|
|
}
|
|
}
|
|
|
|
// create particle array
|
|
function init(){
|
|
particlesArray = [];
|
|
let numberOfParticles = (canvas.height * canvas.width) / 9000;
|
|
for (let i = 0; i < numberOfParticles * numParticles; i++){
|
|
let size = (Math.random() * sizeMultiplier) + 1;
|
|
let x = (Math.random() * ((innerWidth - size * 2) - (size * 2)) + size * 2);
|
|
let y = (Math.random() * ((innerHeight - size * 2) - (size * 2)) + size * 2);
|
|
let directionX = (Math.random() * 5) - 2.5;
|
|
let directionY = (Math.random() * 5) - 2.5;
|
|
let colour = '#8c5523';
|
|
|
|
particlesArray.push(new Particle(x, y, directionX, directionY, size, colour));
|
|
}
|
|
}
|
|
|
|
// check if particles are close enough to connect to eachother
|
|
function connect(){
|
|
let opacityValue = 1;
|
|
for (let a = 0; a < particlesArray.length; a++){
|
|
for (let b = a; b < particlesArray.length; b++){
|
|
let distance = ((particlesArray[a].x - particlesArray[b].x) * (particlesArray[a].x - particlesArray[b].x)) + ((particlesArray[a].y - particlesArray[b].y) * (particlesArray[a].y - particlesArray[b].y));
|
|
if (distance < (canvas.width / connectionDensity) * (canvas.height / connectionDensity)){
|
|
opacityValue = 1 - (distance / 20000);
|
|
// change colour on 'hover' if hover = true (default)
|
|
if(hover){
|
|
let dx = mousePosition.x - particlesArray[a].x;
|
|
let dy = mousePosition.y - particlesArray[a].y;
|
|
let mouseDistance = Math.sqrt((dx * dx) + (dy * dy));
|
|
if (mouseDistance < 200) {
|
|
// change colour if mouse is close
|
|
canvasContext.globalAlpha = opacityValue;
|
|
canvasContext.strokeStyle = strokeHoverColour;
|
|
}
|
|
else {
|
|
// use regular stroke colour
|
|
canvasContext.globalAlpha = opacityValue;
|
|
canvasContext.strokeStyle = strokeColour;
|
|
}
|
|
}
|
|
else {
|
|
canvasContext.globalAlpha = opacityValue;
|
|
canvasContext.strokeStyle = strokeColour;
|
|
}
|
|
canvasContext.lineWidth = 1;
|
|
canvasContext.beginPath();
|
|
canvasContext.moveTo(particlesArray[a].x, particlesArray[a].y);
|
|
canvasContext.lineTo(particlesArray[b].x, particlesArray[b].y);
|
|
canvasContext.stroke();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// animation loop
|
|
function animate(){
|
|
requestAnimationFrame(animate);
|
|
canvasContext.clearRect(0, 0, innerWidth, innerHeight);
|
|
|
|
for (let i = 0; i < particlesArray.length; i++){
|
|
particlesArray[i].update();
|
|
}
|
|
if(connections){
|
|
connect();
|
|
}
|
|
}
|
|
|
|
// resize event
|
|
window.addEventListener('resize', function(){
|
|
canvas.width = innerWidth;
|
|
canvas.height = innerHeight;
|
|
mousePosition.radius = ((canvas.height / 80) * (canvas.width / 80));
|
|
init();
|
|
});
|
|
|
|
// mouse-out event (mouse leaving the window)
|
|
window.addEventListener('mouseout', function(){
|
|
mousePosition.x = undefined;
|
|
mousePosition.y = undefined;
|
|
});
|
|
|
|
init();
|
|
animate();
|
|
|
|
function checkParams(){
|
|
if (typeof numParticles == 'undefined'){
|
|
numParticles = 1;
|
|
}
|
|
else if (Number.isInteger(particles)){
|
|
numParticles;
|
|
}
|
|
else{
|
|
numParticles = 1;
|
|
console.log("'particles' must be an integer value. Using default of '1'");
|
|
};
|
|
|
|
if (typeof sizeMultiplier == 'undefined'){
|
|
sizeMultiplier = 3;
|
|
}
|
|
else if (Number.isFinite(sizeMultiplier)){
|
|
sizeMultiplier;
|
|
}
|
|
else{
|
|
sizeMultiplier = 3;
|
|
console.log("'sizeMultiplier' must be a finite number. Using default of '3'");
|
|
};
|
|
|
|
if (typeof connections == 'undefined'){
|
|
connections = true;
|
|
}
|
|
else if (typeof connections === 'boolean'){
|
|
connections;
|
|
}
|
|
else{
|
|
connections = true;
|
|
console.log("'connections' must be either 'true' or 'false'. Using default of 'true'");
|
|
}
|
|
|
|
if (typeof connectionDensity == 'undefined'){
|
|
connectionDensity = 7;
|
|
}
|
|
else if (Number.isFinite(connectionDensity) && connectionDensity > 1){
|
|
connectionDensity;
|
|
}
|
|
else{
|
|
connectionDensity = 7;
|
|
console.log("'connectionDensity' must be a finite number greater than 1. Using default of '7'");
|
|
}
|
|
|
|
if (typeof speed == 'undefined'){
|
|
speed = 50;
|
|
}
|
|
if (Number.isInteger(speed) && (1 <= speed && speed <= 1000)){
|
|
speed;
|
|
}
|
|
else{
|
|
speed = 50;
|
|
console.log("'speed' must be an integer between 1-1000. Using default of '50'");
|
|
};
|
|
|
|
if (typeof avoidMouse == 'undefined'){
|
|
avoidMouse = true;
|
|
}
|
|
else if (typeof avoidMouse === 'boolean'){
|
|
avoidMouse;
|
|
}
|
|
else{
|
|
avoidMouse = true;
|
|
console.log("'avoidMouse' must be either 'true' or 'false'. Using default of 'true'");
|
|
}
|
|
|
|
if (typeof hover == 'undefined'){
|
|
hover = true;
|
|
}
|
|
else if (typeof hover === 'boolean'){
|
|
hover;
|
|
}
|
|
else{
|
|
hover = true;
|
|
console.log("'hover' must be either 'true' or 'false'. Using default of 'true'");
|
|
}
|
|
}
|
|
|
|
function checkColours(){
|
|
if (getComputedStyle(document.documentElement).getPropertyValue('--col-particle').length === 0){
|
|
particleColour = '#000000';
|
|
console.log("CSS variable '--col-particle' is not set. Using 'black' (#000000).");
|
|
}
|
|
else{
|
|
particleColour = getComputedStyle(document.documentElement).getPropertyValue('--col-particle');
|
|
}
|
|
|
|
if (getComputedStyle(document.documentElement).getPropertyValue('--col-particle-stroke').length === 0){
|
|
strokeColour = '#000000';
|
|
console.log("CSS variable '--col-particle-stroke' is not set. Using 'black' (#000000).");
|
|
}
|
|
else{
|
|
strokeColour = getComputedStyle(document.documentElement).getPropertyValue('--col-particle-stroke');
|
|
}
|
|
|
|
if (hover === true && getComputedStyle(document.documentElement).getPropertyValue('--col-particle-stroke-hover').length === 0){
|
|
strokeHoverColour = '#ff0000';
|
|
console.log("CSS variable '--col-particle-stroke-hover' is not set. Using 'red' (#ff0000).");
|
|
}
|
|
else{
|
|
strokeHoverColour = getComputedStyle(document.documentElement).getPropertyValue('--col-particle-stroke-hover');
|
|
}
|
|
}
|
|
} |