311 lines
11 KiB
JavaScript
311 lines
11 KiB
JavaScript
function particles(){
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/* particles animation
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based on the amazing tutorial by 'Franks Laboratory'
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https://youtu.be/d620nV6bp0A
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*/
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// check parameters and use defaults as necessary
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checkParams();
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// read css colour variables from root element, set defaults as necessary
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let particleColour;
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let strokeColour;
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let strokeHoverColour;
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checkColours();
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// get canvas element, set context and size
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const canvas = document.getElementById('particles');
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const canvasContext = canvas.getContext('2d');
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canvas.width = window.innerWidth;
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canvas.height = window.innerHeight;
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let particlesArray;
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speed = (speed !== 0) ? (speed / 100) : 0; // index speed to base 100 = 1
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opacity = opacity / 100;
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// set overall canvas opacity
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canvas.style.opacity = opacity;
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// get mouse position
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let mousePosition ={
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x: undefined,
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y: undefined,
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radius: (canvas.height / 80) * (canvas.width / 80)
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};
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// add mouse position event listener
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window.addEventListener('mousemove', function(event){
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mousePosition.x = event.x;
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mousePosition.y = event.y;
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});
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// create particle class
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class Particle{
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constructor(x, y, directionX, directionY, size, colour) {
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this.x = x;
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this.y = y;
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this.directionX = directionX;
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this.directionY = directionY;
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this.size = size;
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this.colour = colour;
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}
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// method to draw individual particles
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draw(){
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canvasContext.beginPath();
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canvasContext.arc(this.x, this.y, this.size, 0, Math.PI * 2, false);
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canvasContext.fillStyle = particleColour;
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canvasContext.fill();
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}
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// check particle position, mouse position, move particle and draw it
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update(){
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// check if particle is still within canvas
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if (this.x > canvas.width || this.x < 0){
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this.directionX = -this.directionX;
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}
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if (this.y > canvas.height || this.y < 0){
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this.directionY = -this.directionY;
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}
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// avoid the mouse if avoidMouse = true (default)
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if (avoidMouse){
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let dx = mousePosition.x - this.x;
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let dy = mousePosition.y - this.y;
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let distance = Math.sqrt((dx * dx) + (dy * dy));
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if (distance < mousePosition.radius + this.size){
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if (mousePosition.x < this.x && this.x < canvas.width - this.size * 10){
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this.x += 10;
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}
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if (mousePosition.x > this.x && this.x > this.size * 10){
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this.x -= 10;
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}
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if (mousePosition.y < this.y && this.y < canvas.height - this.size * 10){
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this.y += 10;
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}
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if (mousePosition.y > this.y && this.y > this.size * 10){
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this.y -= 10;
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}
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}
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}
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// move particle
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if (speed !== 0) {
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this.x += this.directionX * speed;
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this.y += this.directionY * speed;
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}
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// draw particle
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this.draw();
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}
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}
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// create particle array
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function init(){
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particlesArray = [];
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let numberOfParticles = (canvas.height * canvas.width) / 9000;
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for (let i = 0; i < numberOfParticles * numParticles; i++){
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let size = (Math.random() * sizeMultiplier) + 1;
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let x = (Math.random() * ((innerWidth - size * 2) - (size * 2)) + size * 2);
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let y = (Math.random() * ((innerHeight - size * 2) - (size * 2)) + size * 2);
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let directionX = (Math.random() * 5) - 2.5;
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let directionY = (Math.random() * 5) - 2.5;
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let colour = '#8c5523';
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particlesArray.push(new Particle(x, y, directionX, directionY, size, colour));
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}
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}
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// check if particles are close enough to connect to eachother
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function connect(){
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let opacityValue = 1;
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for (let a = 0; a < particlesArray.length; a++){
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for (let b = a; b < particlesArray.length; b++){
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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));
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if (distance < (canvas.width / connectionDensity) * (canvas.height / connectionDensity)){
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opacityValue = 1 - (distance / 20000);
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// change colour on 'hover' if hover = true (default)
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if(hover){
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let dx = mousePosition.x - particlesArray[a].x;
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let dy = mousePosition.y - particlesArray[a].y;
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let mouseDistance = Math.sqrt((dx * dx) + (dy * dy));
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if (mouseDistance < 200) {
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// change colour if mouse is close
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canvasContext.globalAlpha = opacityValue;
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canvasContext.strokeStyle = strokeHoverColour;
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}
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else {
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// use regular stroke colour
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canvasContext.globalAlpha = opacityValue;
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canvasContext.strokeStyle = strokeColour;
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}
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}
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else {
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canvasContext.globalAlpha = opacityValue;
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canvasContext.strokeStyle = strokeColour;
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}
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canvasContext.lineWidth = width;
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canvasContext.beginPath();
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canvasContext.moveTo(particlesArray[a].x, particlesArray[a].y);
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canvasContext.lineTo(particlesArray[b].x, particlesArray[b].y);
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canvasContext.stroke();
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}
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}
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}
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}
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// animation loop
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function animate(){
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requestAnimationFrame(animate);
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canvasContext.clearRect(0, 0, innerWidth, innerHeight);
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for (let i = 0; i < particlesArray.length; i++){
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particlesArray[i].update();
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}
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if(connections){
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connect();
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}
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}
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// resize event
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window.addEventListener('resize', function(){
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canvas.width = innerWidth;
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canvas.height = innerHeight;
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mousePosition.radius = ((canvas.height / 80) * (canvas.width / 80));
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init();
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});
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// mouse-out event (mouse leaving the window)
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window.addEventListener('mouseout', function(){
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mousePosition.x = undefined;
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mousePosition.y = undefined;
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});
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init();
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animate();
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function checkParams(){
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if (typeof opacity == 'undefined'){
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opacity = 100;
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}
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else if (Number.isFinite(opacity) && (0 <= opacity && opacity <= 100)){
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opacity;
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}
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else{
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opacity = 100;
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console.log("'opacity' must be a finite number between 0 and 100. Using default of '100'.");
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};
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if (typeof numParticles == 'undefined'){
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numParticles = 1;
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}
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else if (Number.isFinite(numParticles)){
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numParticles;
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}
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else{
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numParticles = 1;
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console.log("'numParticles' must be a finite number. Using default of '1'.");
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};
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if (typeof sizeMultiplier == 'undefined'){
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sizeMultiplier = 5;
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}
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else if (Number.isFinite(sizeMultiplier)){
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sizeMultiplier;
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}
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else{
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sizeMultiplier = 5;
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console.log("'sizeMultiplier' must be a finite number. Using default of '5'.");
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};
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if (typeof width == 'undefined'){
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width = 1;
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}
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else if (Number.isInteger(width) && width > 0){
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width;
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}
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else{
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width = 1;
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console.log("'width' must be an integer number of pixels greater than 0. Using default of '1'.");
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};
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if (typeof connections == 'undefined'){
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connections = true;
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}
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else if (typeof connections === 'boolean'){
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connections;
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}
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else{
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connections = true;
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console.log("'connections' must be either 'true' or 'false'. Using default of 'true'.");
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}
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if (typeof connectionDensity == 'undefined'){
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connectionDensity = (1 / 15) * 100;
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}
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else if (Number.isFinite(connectionDensity) && connectionDensity > 1){
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connectionDensity = (1 / connectionDensity) * 100;
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}
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else{
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connectionDensity = (1 / 15) * 100;
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console.log("'connectionDensity' must be a finite number greater than 1. Using default of '15'.");
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}
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if (typeof speed == 'undefined'){
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speed = 50;
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}
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if (Number.isInteger(speed) && (0 <= speed && speed <= 1000)){
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speed;
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}
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else{
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speed = 50;
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console.log("'speed' must be an integer between 1-1000. Using default of '50'.");
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};
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if (typeof avoidMouse == 'undefined'){
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avoidMouse = true;
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}
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else if (typeof avoidMouse === 'boolean'){
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avoidMouse;
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}
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else{
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avoidMouse = true;
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console.log("'avoidMouse' must be either 'true' or 'false'. Using default of 'true'.");
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}
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if (typeof hover == 'undefined'){
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hover = true;
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}
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else if (typeof hover === 'boolean'){
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hover;
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}
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else{
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hover = true;
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console.log("'hover' must be either 'true' or 'false'. Using default of 'true'.");
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}
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}
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function checkColours(){
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if (getComputedStyle(document.documentElement).getPropertyValue('--col-particle').length === 0){
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particleColour = '#000000';
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console.log("CSS variable '--col-particle' is not set. Using 'black' (#000000).");
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}
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else{
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particleColour = getComputedStyle(document.documentElement).getPropertyValue('--col-particle');
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}
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if (getComputedStyle(document.documentElement).getPropertyValue('--col-particle-stroke').length === 0){
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strokeColour = '#000000';
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console.log("CSS variable '--col-particle-stroke' is not set. Using 'black' (#000000).");
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}
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else{
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strokeColour = getComputedStyle(document.documentElement).getPropertyValue('--col-particle-stroke');
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}
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if (hover === true && getComputedStyle(document.documentElement).getPropertyValue('--col-particle-stroke-hover').length === 0){
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strokeHoverColour = '#ff0000';
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console.log("CSS variable '--col-particle-stroke-hover' is not set. Using 'red' (#ff0000).");
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}
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else{
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strokeHoverColour = getComputedStyle(document.documentElement).getPropertyValue('--col-particle-stroke-hover');
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}
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}
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} |