@kajws/galaxy-js/dist/galaxy-js.es.js

A JavaScript port of the classic galaxy screensaver with 3D particle simulation

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 * Copyright 2019 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
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 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */function bt(n,t){return(e,s,i)=>{const o=r=>{var h;return((h=r.renderRoot)==null?void 0:h.querySelector(n))??null};if(t){const{get:r,set:h}=typeof s=="object"?e:i??(()=>{const a=Symbol();return{get(){return this[a]},set(l){this[a]=l}}})();return pt(e,s,{get(){let a=r.call(this);return a===void 0&&(a=o(this),(a!==null||this.hasUpdated)&&h.call(this,a)),a}})}return pt(e,s,{get(){return o(this)}})}}class Kt{constructor(t,e,s,i){if(this.stars=[],this.data={},!t)throw new Error("Velocity is required");if(!e)throw new Error("Position is required");if(!s)throw new Error("Rotation is required");this.vel=t,this.pos=e,this.rotation=s,this.mass=i}}class Xt{constructor(t,e,s=0){if(this.data={},!t)throw new Error("Position is required");if(!e)throw new Error("Velocity is required");this.pos=t,this.vel=e,this.mass=s}}const st=(n,t)=>{for(const e of n)for(let s=0;s<e.stars.length;s++)t(e.stars[s],e,s)},Yt=Math.PI*2,X=()=>Math.random()*Yt;class u{constructor(t=0,e=0,s=0){this.x=t,this.y=e,this.z=s}static zero(){return new u(0,0,0)}static random(t=1){return new u(Math.random(),Math.random(),Math.random()).mul(t)}static randomCentered(t=1){return u.random().sub(.5).mul(t)}get magnitude(){return Math.sqrt(this.x**2+this.y**2+this.z**2)}copy(){return new u(this.x,this.y,this.z)}sub(t){return typeof t=="number"?new u(this.x-t,this.y-t,this.z-t):new u(this.x-t.x,this.y-t.y,this.z-t.z)}add(t){return typeof t=="number"?new u(this.x+t,this.y+t,this.z+t):new u(this.x+t.x,this.y+t.y,this.z+t.z)}mul(t){return typeof t=="number"?new u(this.x*t,this.y*t,this.z*t):new u(this.x*t.x,this.y*t.y,this.z*t.z)}div(t){return typeof t=="number"?new u(this.x/t,this.y/t,this.z/t):new u(this.x/t.x,this.y/t.y,this.z/t.z)}normalize(){return this.div(this.magnitude)}}class ${constructor(t){if(t.length!==3)throw new Error(`Matrix must have 3 rows, got ${t.length}`);for(let e=0;e<t.length;e++)if(t[e].length!==3)throw new Error(`Row ${e} must have 3 columns, got ${t[e].length}`);this.data=t.map(e=>[...e])}static identity(){return new $([[1,0,0],[0,1,0],[0,0,1]])}static fromEuler(t,e,s){const i=Math.cos(t),o=Math.sin(t),r=Math.cos(e),h=Math.sin(e),a=Math.cos(s),l=Math.sin(s);return new $([[a*r,a*h*o-l*i,a*h*i+l*o],[l*r,l*h*o+a*i,l*h*i-a*o],[-h,r*o,r*i]])}static randomRotation(){const t=X(),e=X(),s=X();return $.fromEuler(t,e,s)}static fromAxisAngle(t,e){const s=t.x,i=t.y,o=t.z,r=Math.cos(e),h=Math.sin(e),a=1-r,l=a*s*s+r,d=a*s*i-o*h,c=a*s*o+i*h,m=a*i*s+o*h,_=a*i*i+r,f=a*i*o-s*h,B=a*o*s-i*h,F=a*o*i+s*h,Ct=a*o*o+r;return new $([[l,d,c],[m,_,f],[B,F,Ct]])}transform(t){return new u(this.data[0][0]*t.x+this.data[1][0]*t.y+this.data[2][0]*t.z,this.data[0][1]*t.x+this.data[1][1]*t.y+this.data[2][1]*t.z,this.data[0][2]*t.x+this.data[1][2]*t.y+this.data[2][2]*t.z)}mul(t){const e=[];for(let s=0;s<3;s++){e[s]=[];for(let i=0;i<3;i++){e[s][i]=0;for(let o=0;o<3;o++)e[s][i]+=this.data[s][o]*t.data[o][i]}}return new $(e)}get(t,e){return this.data[t][e]}set(t,e,s){this.data[t][e]=s}toArray(){return this.data.map(t=>[...t])}toEuler(){return new u(Math.atan2(this.data[2][1],this.data[2][2]),Math.asin(-this.data[2][0]),Math.atan2(this.data[1][0],this.data[0][0]))}}const G=.005,Y=.001,wt=n=>{st(n,t=>{let e=u.zero();for(const i of n){const o=i.pos.sub(t.pos),r=o.magnitude**2;if(r===0)continue;const h=Math.sqrt(r),a=Y*i.mass/(h*r),l=o.mul(a);e=e.add(l)}const s=e.mul(G);t.vel=t.vel.add(s),t.pos=t.pos.add(t.vel.mul(G))});for(const t of n){let e=u.zero();for(const i of n){if(t===i)continue;const o=i.pos.sub(t.pos),r=o.magnitude**2;if(r===0)continue;const h=Math.sqrt(r),a=Y*i.mass/(h*r),l=o.mul(a);e=e.add(l)}const s=e.mul(G);t.vel=t.vel.add(s)}for(const t of n)t.pos=t.pos.add(t.vel.mul(G))},St=n=>{const{minStarCount:t=1500,maxStarCount:e,minGalaxyRadius:s=1,maxGalaxyRadius:i,maxInitialSpeed:o=4,rewindTimeSteps:r=3,initialCollisionAvoidanceOffset:h=1.5}=n,a=u.randomCentered(o),d=a.mul(-r).add(u.randomCentered(h)),c=u.random(Math.PI),m=e?Math.random()*(e-t)+t:t,_=i?Math.random()*(i-s)+s:s,f=new Kt(a,d,c,m),B=$.fromEuler(f.rotation.x,f.rotation.y,f.rotation.z);for(let F=0;F<m;F++)f.stars.push(Zt(f,B,_));return f},Zt=(n,t,e=1)=>{const s=2*Math.PI*Math.random(),i=Math.random()*e;let o=Math.random()*Math.exp(-2*(i/e))/5*e;Math.random()<.5&&(o=-o);const r=Math.sqrt(i**2+o**2),h=Math.sqrt(n.mass*Y/r),a=Math.sin(s),l=Math.cos(s),d=new u(i*l,i*a,o),c=new u(-h*a,h*l,0),m=t.transform(d).add(n.pos),_=t.transform(c).add(n.vel);return new Xt(m,_)};var Qt=Object.defineProperty,te=Object.getOwnPropertyDescriptor,x=(n,t,e,s)=>{for(var i=s>1?void 0:s?te(t,e):t,o=n.length-1,r;o>=0;o--)(r=n[o])&&(i=(s?r(t,e,i):r(i))||i);return s&&i&&Qt(t,e,i),i};let y=class extends C{constructor(){super(...arguments),this.galaxyCount=3,this.maxGalaxyCount=3,this.zoomFactor=1,this.rotation=.1,this._simulator=null,this._galaxyFactory=null,this._galaxies=[],this._ctx=null,this._animationFrameId=null,this._step=0,this._rotation_vector=null,this._animate=()=>{this._galaxies&&this._simulator&&this._simulator.updateGalaxies(this._galaxies),this._draw(),this._step++,this._step>1500&&(this._initialiseGalaxies(),this._updateRotation()),this._animationFrameId=requestAnimationFrame(this._animate)}}render(){return vt`<canvas id="galaxyCanvas"></canvas>`}firstUpdated(){this._ctx=this._canvas.getContext("2d"),this._resizeObserver=new ResizeObserver(()=>this._handleResize()),this._resizeObserver.observe(this),this._handleResize(),this._initialiseGalaxies(),this._updateRotation(),this._startAnimation()}updated(n){(n.has("galaxyCount")||n.has("maxGalaxyCount")||n.has("simulator")||n.has("galaxyFactory"))&&this._initialiseGalaxies()}disconnectedCallback(){super.disconnectedCallback(),this._stopAnimation(),this._resizeObserver.disconnect()}_updateRotation(){if(!this.rotation)this._rotation_vector=null;else if(typeof this.rotation=="number"||typeof this.rotation=="string"&&!this.rotation.includes(",")){const t=Number(this.rotation)*(Math.PI/180);this._rotation_vector=u.random(t)}else if(typeof this.rotation=="string"){const[n,t,e]=this.rotation.split(",").map(Number),s=n*(Math.PI/180),i=t*(Math.PI/180),o=e*(Math.PI/180);this._rotation_vector=new u(s,i,o)}}_initialiseGalaxies(){this._simulator=this.simulator||{updateGalaxies:wt},this._galaxyFactory=this.galaxyFactory||{createRandomGalaxy:()=>St({minStarCount:700,maxStarCount:1e3,minGalaxyRadius:.5,maxGalaxyRadius:1.5})};const n=Math.floor(Math.random()*(this.maxGalaxyCount-this.galaxyCount)+this.galaxyCount),t=Math.random()*360,e=360/n;this._galaxies=[];for(let s=0;s<n;s++){const i=this._galaxyFactory.createRandomGalaxy();i.data.color=`hsl(${t+s*e}, 50%, 80%)`,this._galaxies.push(i)}this._step=0}_draw(){if(!this._ctx||!this._canvas)return;const n=this._canvas.width,t=this._canvas.height,e=(n+t)/40*this.zoomFactor;this._ctx.fillStyle="rgba(0, 0, 0, 0.4)",this._ctx.fillRect(0,0,n,t);const s=this._ctx,i=this._galaxies.reduce((r,h)=>r.add(h.pos),new u(0,0,0)).div(this._galaxies.length);let o=$.identity();if(this._rotation_vector){const r=this._rotation_vector.magnitude,h=this._rotation_vector.normalize(),a=r*this._step;o=$.fromAxisAngle(h,a)}st(this._galaxies,(r,h)=>{if(!h.data.color){const c=`hsl(${Math.random()*360}, 100%, 50%)`;h.data.color=c}s.fillStyle=h.data.color;const a=o?o.transform(r.pos):r.pos,l=Math.floor((a.x-i.x)*e)+n/2,d=Math.floor((a.y-i.y)*e)+t/2;l>=0&&l<n&&d>=0&&d<t&&s.fillRect(l,d,1,1)})}_startAnimation(){this._animationFrameId||this._animate()}_stopAnimation(){this._animationFrameId&&(cancelAnimationFrame(this._animationFrameId),this._animationFrameId=null)}_handleResize(){const n=window.devicePixelRatio||1;this._canvas&&(this._canvas.width=this.clientWidth*n,this._canvas.height=this.clientHeight*n)}};y.styles=ft`
    :host {
      display: block;
      width: 100%;
      height: 100%;
    }
    canvas {
      display: block;
      width: 100%;
      height: 100%;
    }
  `;x([z({type:Number,attribute:"galaxy-count"})],y.prototype,"galaxyCount",2);x([z({type:Number,attribute:"max-galaxy-count"})],y.prototype,"maxGalaxyCount",2);x([z({type:Number,attribute:"zoom"})],y.prototype,"zoomFactor",2);x([z({type:String,attribute:"rotation"})],y.prototype,"rotation",2);x([z({type:Object,attribute:"simulator"})],y.prototype,"simulator",2);x([z({type:Object,attribute:"galaxy-factory"})],y.prototype,"galaxyFactory",2);x([bt("#galaxyCanvas")],y.prototype,"_canvas",2);y=x([At("galaxy-simulation")],y);var ee=Object.defineProperty,se=Object.getOwnPropertyDescriptor,Et=(n,t,e,s)=>{for(var i=s>1?void 0:s?se(t,e):t,o=n.length-1,r;o>=0;o--)(r=n[o])&&(i=(s?r(t,e,i):r(i))||i);return s&&i&&ee(t,e,i),i};let k=class extends C{constructor(){super(...arguments),this._ctx=null,this._galaxies=[],this._animationFrameId=null,this._step=0,this._animate=()=>{wt(this._galaxies),this._draw(),this._animationFrameId=requestAnimationFrame(this._animate),this._step++,this._step>1500&&(this._step=0,this._initialiseSimulation())}}render(){return vt`<canvas id="galaxyCanvas"></canvas>`}firstUpdated(){this._ctx=this._canvas.getContext("2d"),this._resizeObserver=new ResizeObserver(()=>this._handleResize()),this._resizeObserver.observe(this),this._initialiseSimulation(),this._startAnimation()}disconnectedCallback(){super.disconnectedCallback(),this._stopAnimation(),this._resizeObserver.disconnect()}_initialiseSimulation(){this._galaxies=[];const t=["#ffadad","#a0c4ff","#fdffb6"];for(let e=0;e<3;e++){const s=St({minStarCount:700,maxStarCount:1e3,minGalaxyRadius:.5,maxGalaxyRadius:1.5});s.data.color=t[e%t.length],this._galaxies.push(s)}}_draw(){if(!this._ctx||!this._canvas)return;const{width:n,height:t}=this._canvas;this._ctx.fillStyle="rgba(0, 0, 0, 0.4)",this._ctx.fillRect(0,0,n,t);const e=(n+t)/40;st(this._galaxies,(s,i)=>{this._ctx.fillStyle=i.data.color;const o=Math.floor(s.pos.x*e)+n/2,r=Math.floor(s.pos.y*e)+t/2;o>=0&&o<n&&r>=0&&r<t&&this._ctx.fillRect(o,r,1,1)})}_startAnimation(){this._animationFrameId||this._animate()}_stopAnimation(){this._animationFrameId&&(cancelAnimationFrame(this._animationFrameId),this._animationFrameId=null)}_handleResize(){if(!this._canvas)return;const n=window.devicePixelRatio||1;this._canvas.width=this.clientWidth*n,this._canvas.height=this.clientHeight*n}};k.styles=ft`
    /* Styles for the host element itself (<simple-galaxy-simulation>) */
    :host {
      display: block; /* Ensures the component takes up layout space */
      width: 100%;
      height: 100%;
      overflow: hidden; /* Hides anything drawn outside the component's bounds */
    }
    /* Styles for the canvas element inside the component */
    canvas {
      display: block;
      width: 100%;
      height: 100%;
    }
  `;Et([bt("#galaxyCanvas")],k.prototype,"_canvas",2);k=Et([At("simple-galaxy-simulation")],k);