add a funny cursor effect
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fc99d01b6d
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GPG Key ID:
14546221E3595D0C
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@ -0,0 +1,212 @@
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(function() {
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let possibleColors = [
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"#D61C59",
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"#E7D84B",
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"#1B8798",
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];
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let element = document.body;
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let width = window.innerWidth;
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let height = window.innerHeight;
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const cursor = { x: width / 2, y: width / 2 };
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const lastPos = { x: width / 2, y: width / 2 };
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const particles = [];
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const canvImages = [];
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let canvas, context, animationFrame;
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const char = "*";
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const prefersReducedMotion = window.matchMedia(
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"(prefers-reduced-motion: reduce)"
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);
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// Re-initialise or destroy the cursor when the prefers-reduced-motion setting changes
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prefersReducedMotion.onchange = () => {
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if (prefersReducedMotion.matches) {
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destroy();
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} else {
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init();
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}
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};
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function init() {
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// Don't show the cursor trail if the user has prefers-reduced-motion enabled
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if (prefersReducedMotion.matches) {
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console.log(
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"This browser has prefers reduced motion turned on, so the cursor did not init"
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);
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return false;
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}
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canvas = document.createElement("canvas");
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context = canvas.getContext("2d");
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canvas.style.top = "0px";
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canvas.style.left = "0px";
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canvas.style.pointerEvents = "none";
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canvas.style.position = "fixed";
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element.appendChild(canvas);
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canvas.width = width;
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canvas.height = height;
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context.font = "21px serif";
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context.textBaseline = "middle";
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context.textAlign = "center";
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possibleColors.forEach((color) => {
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let measurements = context.measureText(char);
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let bgCanvas = document.createElement("canvas");
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let bgContext = bgCanvas.getContext("2d");
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bgCanvas.width = measurements.width;
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bgCanvas.height =
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measurements.actualBoundingBoxAscent +
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measurements.actualBoundingBoxDescent;
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bgContext.fillStyle = color;
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bgContext.textAlign = "center";
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bgContext.font = "21px serif";
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bgContext.textBaseline = "middle";
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bgContext.fillText(
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char,
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bgCanvas.width / 2,
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measurements.actualBoundingBoxAscent
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);
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canvImages.push(bgCanvas);
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});
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bindEvents();
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loop();
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}
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// Bind events that are needed
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function bindEvents() {
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element.addEventListener("mousemove", onMouseMove);
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element.addEventListener("touchmove", onTouchMove, { passive: true });
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element.addEventListener("touchstart", onTouchMove, { passive: true });
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window.addEventListener("resize", onWindowResize);
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}
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function onWindowResize(e) {
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width = window.innerWidth;
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height = window.innerHeight;
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canvas.width = width;
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canvas.height = height;
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}
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function onTouchMove(e) {
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if (e.touches.length > 0) {
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for (let i = 0; i < e.touches.length; i++) {
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addParticle(
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e.touches[i].clientX,
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e.touches[i].clientY,
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canvImages[Math.floor(Math.random() * canvImages.length)]
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);
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}
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}
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}
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function onMouseMove(e) {
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window.requestAnimationFrame(() => {
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cursor.x = e.clientX;
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cursor.y = e.clientY;
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const distBetweenPoints = Math.hypot(
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cursor.x - lastPos.x,
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cursor.y - lastPos.y
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);
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if (distBetweenPoints > 1.5) {
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addParticle(
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cursor.x,
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cursor.y,
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canvImages[Math.floor(Math.random() * possibleColors.length)]
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);
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lastPos.x = cursor.x;
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lastPos.y = cursor.y;
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}
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});
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}
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function addParticle(x, y, color) {
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particles.push(new Particle(x, y, color));
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}
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function updateParticles() {
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if (particles.length == 0) {
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return;
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}
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context.clearRect(0, 0, width, height);
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// Update
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for (let i = 0; i < particles.length; i++) {
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particles[i].update(context);
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}
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// Remove dead particles
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for (let i = particles.length - 1; i >= 0; i--) {
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if (particles[i].lifeSpan < 0) {
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particles.splice(i, 1);
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}
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}
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if (particles.length == 0) {
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context.clearRect(0, 0, width, height);
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}
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}
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function loop() {
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updateParticles();
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animationFrame = requestAnimationFrame(loop);
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}
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function destroy() {
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canvas.remove();
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cancelAnimationFrame(animationFrame);
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element.removeEventListener("mousemove", onMouseMove);
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element.removeEventListener("touchmove", onTouchMove);
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element.removeEventListener("touchstart", onTouchMove);
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window.addEventListener("resize", onWindowResize);
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};
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function Particle(x, y, canvasItem) {
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const lifeSpan = Math.floor(Math.random() * 30 + 60);
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this.initialLifeSpan = lifeSpan; //
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this.lifeSpan = lifeSpan; //ms
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this.velocity = {
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x: (Math.random() < 0.5 ? -1 : 1) * (Math.random() / 2),
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y: Math.random() * 0.7 + 0.9,
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};
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this.position = { x: x, y: y };
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this.canv = canvasItem;
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this.update = function (context) {
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this.position.x += this.velocity.x;
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this.position.y += this.velocity.y;
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this.lifeSpan--;
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this.velocity.y += 0.02;
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const scale = Math.max(this.lifeSpan / this.initialLifeSpan, 0);
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context.drawImage(
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this.canv,
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this.position.x - (this.canv.width / 2) * scale,
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this.position.y - this.canv.height / 2,
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this.canv.width * scale,
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this.canv.height * scale
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);
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};
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}
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init();
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return {
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destroy: destroy
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}
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}
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)();
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@ -0,0 +1,2 @@
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// https://github.com/tholman/cursor-effects/blob/master/src/fairyDustCursor.js
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!function(){let t=["#D61C59","#E7D84B","#1B8798"],e=document.body,n=window.innerWidth,i=window.innerHeight;const o={x:n/2,y:n/2},s={x:n/2,y:n/2},h=[],a=[];let c,r,d;const l="*",u=window.matchMedia("(prefers-reduced-motion: reduce)");function f(){if(u.matches)return console.log("This browser has prefers reduced motion turned on, so the cursor did not init"),!1;c=document.createElement("canvas"),r=c.getContext("2d"),c.style.top="0px",c.style.left="0px",c.style.pointerEvents="none",c.style.position="fixed",e.appendChild(c),c.width=n,c.height=i,r.font="21px serif",r.textBaseline="middle",r.textAlign="center",t.forEach(t=>{let e=r.measureText(l),n=document.createElement("canvas"),i=n.getContext("2d");n.width=e.width,n.height=e.actualBoundingBoxAscent+e.actualBoundingBoxDescent,i.fillStyle=t,i.textAlign="center",i.font="21px serif",i.textBaseline="middle",i.fillText(l,n.width/2,e.actualBoundingBoxAscent),a.push(n)}),e.addEventListener("mousemove",p),e.addEventListener("touchmove",v,{passive:!0}),e.addEventListener("touchstart",v,{passive:!0}),window.addEventListener("resize",m),w()}function m(t){n=window.innerWidth,i=window.innerHeight,c.width=n,c.height=i}function v(t){if(t.touches.length>0)for(let e=0;e<t.touches.length;e++)x(t.touches[e].clientX,t.touches[e].clientY,a[Math.floor(Math.random()*a.length)])}function p(e){window.requestAnimationFrame(()=>{o.x=e.clientX,o.y=e.clientY,Math.hypot(o.x-s.x,o.y-s.y)>1.5&&(x(o.x,o.y,a[Math.floor(Math.random()*t.length)]),s.x=o.x,s.y=o.y)})}function x(t,e,n){h.push(new function(t,e,n){const i=Math.floor(30*Math.random()+60);this.initialLifeSpan=i,this.lifeSpan=i,this.velocity={x:(Math.random()<.5?-1:1)*(Math.random()/2),y:.7*Math.random()+.9},this.position={x:t,y:e},this.canv=n,this.update=function(t){this.position.x+=this.velocity.x,this.position.y+=this.velocity.y,this.lifeSpan--,this.velocity.y+=.02;const e=Math.max(this.lifeSpan/this.initialLifeSpan,0);t.drawImage(this.canv,this.position.x-this.canv.width/2*e,this.position.y-this.canv.height/2,this.canv.width*e,this.canv.height*e)}}(t,e,n))}function w(){!function(){if(0!=h.length){r.clearRect(0,0,n,i);for(let t=0;t<h.length;t++)h[t].update(r);for(let t=h.length-1;t>=0;t--)h[t].lifeSpan<0&&h.splice(t,1);0==h.length&&r.clearRect(0,0,n,i)}}(),d=requestAnimationFrame(w)}function g(){c.remove(),cancelAnimationFrame(d),e.removeEventListener("mousemove",p),e.removeEventListener("touchmove",v),e.removeEventListener("touchstart",v),window.addEventListener("resize",m)}u.onchange=(()=>{u.matches?g():f()}),f()}();
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@ -38,5 +38,7 @@
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</span>
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</p>
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</div>
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<script src='/script/cursor.min.js' type='application/javascript'></script>
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</body>
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</html>
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