canvasparticles-js/dist/index.umd.js

In an HTML canvas, a bunch of interactive particles connected with lines when they approach each other.

!function(t,i){"object"==typeof exports&&"undefined"!=typeof module?module.exports=i():"function"==typeof define&&define.amd?define(i):(t="undefined"!=typeof globalThis?globalThis:t||self).CanvasParticles=i()}(this,function(){"use strict";const t=2*Math.PI;const i=function(t){let i=t>>>0;return{next(){let t=i+1831565813|0;return i=t,t=Math.imul(t^t>>>15,1|t),t^=t+Math.imul(t^t>>>7,61|t),((t^t>>>14)>>>0)/4294967296}}}(Math.random()*2**32).next;class e{static version="4.3.2";static MAX_DT=20;static BASE_DT=1e3/60;static interactionType=Object.freeze({NONE:0,SHIFT:1,MOVE:2});static generationType=Object.freeze({MANUAL:0,NEW:1,MATCH:2});static canvasIntersectionObserver=new IntersectionObserver(t=>{for(let i=0;i<t.length;i++){const e=t[i],s=e.target,n=s.instance;if(!n.options?.animation)return;(s.inViewbox=e.isIntersecting)?n.option.animation?.startOnEnter&&n.start({auto:!0}):n.option.animation?.stopOnLeave&&n.stop({auto:!0,clear:!1})}},{rootMargin:"-1px"});static canvasResizeObserver=new ResizeObserver(t=>{for(let i=0;i<t.length;i++){t[i].target.instance.updateCanvasRect()}for(let i=0;i<t.length;i++){t[i].target.instance.resizeCanvas()}});static defaultIfNaN=(t,i)=>isNaN(+t)?i:+t;static parseNumericOption=(t,i,s,n)=>{if(null==i)return s;const{min:o=-1/0,max:a=1/0}=n??{};return i<o?console.warn(new RangeError(`option.${t} was clamped to ${o} as ${i} is too low`)):i>a&&console.warn(new RangeError(`option.${t} was clamped to ${a} as ${i} is too high`)),e.defaultIfNaN(Math.min(Math.max(i??s,o),a),s)};canvas;ctx;enableAnimating=!1;isAnimating=!1;lastAnimationFrame=0;particles=[];hasManualParticles=!1;clientX=1/0;clientY=1/0;mouseX=1/0;mouseY=1/0;width;height;offX;offY;option;color;constructor(t,i={}){let s;if(t instanceof HTMLCanvasElement)s=t;else{if("string"!=typeof t)throw new TypeError("selector is not a string and neither a HTMLCanvasElement itself");if(s=document.querySelector(t),!(s instanceof HTMLCanvasElement))throw new Error("selector does not point to a canvas")}this.canvas=s,this.canvas.instance=this,this.canvas.inViewbox=!0;const n=this.canvas.getContext("2d");if(!n)throw new Error("failed to get 2D context from canvas");this.ctx=n,this.options=i,e.canvasIntersectionObserver.observe(this.canvas),e.canvasResizeObserver.observe(this.canvas),this.resizeCanvas=this.resizeCanvas.bind(this),this.handleMouseMove=this.handleMouseMove.bind(this),this.handleScroll=this.handleScroll.bind(this),this.updateCanvasRect(),this.resizeCanvas(),window.addEventListener("mousemove",this.handleMouseMove,{passive:!0}),window.addEventListener("scroll",this.handleScroll,{passive:!0})}updateCanvasRect(){const{top:t,left:i,width:e,height:s}=this.canvas.getBoundingClientRect();this.canvas.rect={top:t,left:i,width:e,height:s}}handleMouseMove(t){this.enableAnimating&&(this.clientX=t.clientX,this.clientY=t.clientY,this.isAnimating&&this.updateMousePos())}handleScroll(){this.enableAnimating&&(this.updateCanvasRect(),this.isAnimating&&this.updateMousePos())}updateMousePos(){const{top:t,left:i}=this.canvas.rect;this.mouseX=this.clientX-i,this.mouseY=this.clientY-t}resizeCanvas(){const t=this.canvas.width=this.canvas.rect.width,i=this.canvas.height=this.canvas.rect.height;this.mouseX=1/0,this.mouseY=1/0,this.width=Math.max(t+2*this.option.particles.connectDist,1),this.height=Math.max(i+2*this.option.particles.connectDist,1),this.offX=(t-this.width)/2,this.offY=(i-this.height)/2;const s=this.option.particles.generationType;s!==e.generationType.MANUAL&&(s===e.generationType.NEW||0===this.particles.length?this.newParticles():s===e.generationType.MATCH&&this.matchParticleCount({updateBounds:!0})),this.isAnimating&&this.#t()}#i(){let t=Math.round(this.option.particles.ppm*this.width*this.height/1e6);if(t=Math.min(this.option.particles.max,t),!isFinite(t))throw new RangeError("particleCount must be finite");return 0|t}newParticles({keepAuto:t=!1,keepManual:i=!0}={}){const e=this.#i();this.hasManualParticles&&(t||i)?(this.particles=this.particles.filter(e=>t&&!e.isManual||i&&e.isManual),this.hasManualParticles=this.particles.length>0):this.particles=[];for(let t=0;t<e;t++)this.#e()}matchParticleCount({updateBounds:t=!1}={}){const i=this.#i();if(this.hasManualParticles){const t=[];let e=0;for(const s of this.particles)s.isManual?t.push(s):e>=i||(t.push(s),e++);this.particles=t}else this.particles=this.particles.slice(0,i);if(t)for(const t of this.particles)this.#s(t);for(let t=this.particles.length;t<i;t++)this.#e()}#e(){const e=i()*this.width,s=i()*this.height;this.createParticle(e,s,i()*t,(.5+.5*i())*this.option.particles.relSpeed,(.5+2*Math.pow(i(),5))*this.option.particles.relSize,!1)}createParticle(t,i,e,s,n,o=!0){const a={posX:t,posY:i,x:t,y:i,velX:0,velY:0,offX:0,offY:0,dir:e,speed:s,size:n,gridPos:{x:1,y:1},isVisible:!1,isManual:o};this.#s(a),this.particles.push(a),this.hasManualParticles=!0}#s(t){t.bounds={top:-t.size,right:this.canvas.width+t.size,bottom:this.canvas.height+t.size,left:-t.size}}updateParticles(){const t=this.option.particles.relSpeed,e=this.option.particles.relSize;for(const s of this.particles)s.speed=(.5+.5*i())*t,s.size=(.5+2*Math.pow(i(),5))*e,this.#s(s)}#n(t){const i=this.option.gravity.repulsive>0,e=this.option.gravity.pulling>0;if(!i&&!e)return;const s=this.particles,n=s.length,o=this.option.particles.connectDist,a=o*this.option.gravity.repulsive*t,r=o*this.option.gravity.pulling*t,c=(o/2)**2,l=o**2/256;for(let t=0;t<n;t++){const i=s[t];for(let o=t+1;o<n;o++){const t=s[o],n=i.posX-t.posX,h=i.posY-t.posY,p=n*n+h*h;if(p>=c&&!e)continue;let u,d,m;u=Math.atan2(-h,-n),d=1/(p+l);const f=Math.cos(u),g=Math.sin(u);if(p<c){m=d*a;const e=f*m,s=g*m;i.velX-=e,i.velY-=s,t.velX+=e,t.velY+=s}if(!e)continue;m=d*r;const v=f*m,y=g*m;i.velX+=v,i.velY+=y,t.velX-=v,t.velY-=y}}}#o(i){const s=this.particles,n=s.length,o=this.width,a=this.height,r=this.offX,c=this.offY,l=this.mouseX,h=this.mouseY,p=this.option.particles.rotationSpeed*i,u=this.option.gravity.friction,d=this.option.mouse.connectDist,m=this.option.mouse.distRatio,f=this.option.mouse.interactionType===e.interactionType.NONE,g=this.option.mouse.interactionType===e.interactionType.MOVE,v=1-Math.pow(.75,i);for(let e=0;e<n;e++){const n=s[e];n.dir+=2*(Math.random()-.5)*p*i,n.dir%=t;const y=Math.sin(n.dir)*n.speed,M=Math.cos(n.dir)*n.speed;n.posX+=(y+n.velX)*i,n.posY+=(M+n.velY)*i,n.posX%=o,n.posX<0&&(n.posX+=o),n.posY%=a,n.posY<0&&(n.posY+=a),n.velX*=Math.pow(u,i),n.velY*=Math.pow(u,i);const x=n.posX+r-l,b=n.posY+c-h;if(!f){const t=d/Math.hypot(x,b);m<t?(n.offX+=(t*x-x-n.offX)*v,n.offY+=(t*b-b-n.offY)*v):(n.offX-=n.offX*v,n.offY-=n.offY*v)}n.x=n.posX+n.offX,n.y=n.posY+n.offY,g&&(n.posX=n.x,n.posY=n.y),n.x+=r,n.y+=c,this.#a(n),n.isVisible=1===n.gridPos.x&&1===n.gridPos.y}}#a(t){t.gridPos.x=+(t.x>=t.bounds.left)+ +(t.x>t.bounds.right),t.gridPos.y=+(t.y>=t.bounds.top)+ +(t.y>t.bounds.bottom)}#r(t,i){return!(!t.isVisible&&!i.isVisible)||!(t.gridPos.x===i.gridPos.x&&1!==t.gridPos.x||t.gridPos.y===i.gridPos.y&&1!==t.gridPos.y)}#c(){const i=this.particles,e=i.length,s=this.ctx;for(let n=0;n<e;n++){const e=i[n];e.isVisible&&(e.size>1?(s.beginPath(),s.arc(e.x,e.y,e.size,0,t),s.fill(),s.closePath()):s.fillRect(e.x-e.size,e.y-e.size,2*e.size,2*e.size))}}#l(){const t=this.particles,i=t.length,e=this.ctx,s=this.option.particles.connectDist,n=s**2,o=(s/2)**2,a=s>=Math.min(this.canvas.width,this.canvas.height),r=n*this.option.particles.maxWork,c=this.color.alpha,l=this.color.alpha*s,h=[];for(let s=0;s<i;s++){const p=t[s];let u=0;for(let d=s+1;d<i;d++){const i=t[d];if(!a&&!this.#r(p,i))continue;const s=p.x-i.x,m=p.y-i.y,f=s*s+m*m;if(!(f>n)&&(f>o?(e.globalAlpha=l/Math.sqrt(f)-c,e.beginPath(),e.moveTo(p.x,p.y),e.lineTo(i.x,i.y),e.stroke()):h.push([p.x,p.y,i.x,i.y]),(u+=f)>=r))break}}if(h.length){e.globalAlpha=c,e.beginPath();for(let t=0;t<h.length;t++){const i=h[t];e.moveTo(i[0],i[1]),e.lineTo(i[2],i[3])}e.stroke()}}#t(){this.ctx.clearRect(0,0,this.canvas.width,this.canvas.height),this.ctx.globalAlpha=this.color.alpha,this.ctx.fillStyle=this.color.hex,this.ctx.strokeStyle=this.color.hex,this.ctx.lineWidth=1,this.#c(),this.option.particles.drawLines&&this.#l()}#h(){if(!this.isAnimating)return;requestAnimationFrame(()=>this.#h());const t=performance.now(),i=Math.min(t-this.lastAnimationFrame,e.MAX_DT)/e.BASE_DT;this.#n(i),this.#o(i),this.#t(),this.lastAnimationFrame=t}start({auto:t=!1}={}){return this.isAnimating||t&&!this.enableAnimating||(this.enableAnimating=!0,this.isAnimating=!0,this.updateCanvasRect(),requestAnimationFrame(()=>this.#h())),!this.canvas.inViewbox&&this.option.animation.startOnEnter&&(this.isAnimating=!1),this}stop({auto:t=!1,clear:i=!0}={}){return t||(this.enableAnimating=!1),this.isAnimating=!1,!1!==i&&this.ctx.clearRect(0,0,this.canvas.width,this.canvas.height),!0}destroy(){this.stop(),e.canvasIntersectionObserver.unobserve(this.canvas),e.canvasResizeObserver.unobserve(this.canvas),window.removeEventListener("mousemove",this.handleMouseMove),window.removeEventListener("scroll",this.handleScroll),this.canvas?.remove(),Object.keys(this).forEach(t=>delete this[t])}set options(t){const i=e.parseNumericOption;this.option={background:t.background??!1,animation:{startOnEnter:!!(t.animation?.startOnEnter??1),stopOnLeave:!!(t.animation?.stopOnLeave??1)},mouse:{interactionType:~~i("mouse.interactionType",t.mouse?.interactionType,e.interactionType.MOVE,{min:0,max:2}),connectDistMult:i("mouse.connectDistMult",t.mouse?.connectDistMult,2/3,{min:0}),connectDist:1,distRatio:i("mouse.distRatio",t.mouse?.distRatio,2/3,{min:0})},particles:{generationType:~~i("particles.generationType",t.particles?.generationType,e.generationType.MATCH,{min:0,max:2}),drawLines:!!(t.particles?.drawLines??1),color:t.particles?.color??"black",ppm:~~i("particles.ppm",t.particles?.ppm,100),max:Math.round(i("particles.max",t.particles?.max,1/0,{min:0})),maxWork:Math.round(i("particles.maxWork",t.particles?.maxWork,1/0,{min:0})),connectDist:~~i("particles.connectDistance",t.particles?.connectDistance,150,{min:1}),relSpeed:i("particles.relSpeed",t.particles?.relSpeed,1,{min:0}),relSize:i("particles.relSize",t.particles?.relSize,1,{min:0}),rotationSpeed:i("particles.rotationSpeed",t.particles?.rotationSpeed,2,{min:0})/100},gravity:{repulsive:i("gravity.repulsive",t.gravity?.repulsive,0,{min:0}),pulling:i("gravity.pulling",t.gravity?.pulling,0,{min:0}),friction:i("gravity.friction",t.gravity?.friction,.8,{min:0,max:1})}},this.setBackground(this.option.background),this.setMouseConnectDistMult(this.option.mouse.connectDistMult),this.setParticleColor(this.option.particles.color)}get options(){return this.option}setBackground(t){if(t){if("string"!=typeof t)throw new TypeError("background is not a string");this.canvas.style.background=this.option.background=t}}setMouseConnectDistMult(t){const i=e.parseNumericOption("mouse.connectDistMult",t,2/3,{min:0});this.option.mouse.connectDist=this.option.particles.connectDist*i}setParticleColor(t){if(this.ctx.fillStyle=t,"#"===String(this.ctx.fillStyle)[0])this.color={hex:String(this.ctx.fillStyle),alpha:1};else{let t=String(this.ctx.fillStyle).split(",").at(-1);t=t?.slice(1,-1)??"1",this.ctx.fillStyle=String(this.ctx.fillStyle).split(",").slice(0,-1).join(",")+", 1)",this.color={hex:String(this.ctx.fillStyle),alpha:isNaN(+t)?1:+t}}}}return e});