@kajws/galaxy-js
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A JavaScript port of the classic galaxy screensaver with 3D particle simulation
61 lines (60 loc) • 29.1 kB
JavaScript
var GalaxyJS=function(p){var Mt;"use strict";/**
* @license
* Copyright 2019 Google LLC
* SPDX-License-Identifier: BSD-3-Clause
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* @license
* Copyright 2017 Google LLC
* SPDX-License-Identifier: BSD-3-Clause
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* Copyright 2017 Google LLC
* SPDX-License-Identifier: BSD-3-Clause
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* Copyright 2017 Google LLC
* SPDX-License-Identifier: BSD-3-Clause
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* Copyright 2017 Google LLC
* SPDX-License-Identifier: BSD-3-Clause
*/function At(o,t){return(e,s,i)=>{const n=a=>{var h;return((h=a.renderRoot)==null?void 0:h.querySelector(o))??null};if(t){const{get:a,set:h}=typeof s=="object"?e:i??(()=>{const r=Symbol();return{get(){return this[r]},set(l){this[r]=l}}})();return vt(e,s,{get(){let r=a.call(this);return r===void 0&&(r=n(this),(r!==null||this.hasUpdated)&&h.call(this,r)),r}})}return vt(e,s,{get(){return n(this)}})}}class xt{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 St{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 Q=(o,t)=>{for(const e of o)for(let s=0;s<e.stars.length;s++)t(e.stars[s],e,s)},bt=Math.PI*2,D=()=>Math.random()*bt,Xt=(o,t)=>Math.random()*(t-o)+o;class d{constructor(t=0,e=0,s=0){this.x=t,this.y=e,this.z=s}static zero(){return new d(0,0,0)}static random(t=1){return new d(Math.random(),Math.random(),Math.random()).mul(t)}static randomCentered(t=1){return d.random().sub(.5).mul(t)}get magnitude(){return Math.sqrt(this.x**2+this.y**2+this.z**2)}copy(){return new d(this.x,this.y,this.z)}sub(t){return typeof t=="number"?new d(this.x-t,this.y-t,this.z-t):new d(this.x-t.x,this.y-t.y,this.z-t.z)}add(t){return typeof t=="number"?new d(this.x+t,this.y+t,this.z+t):new d(this.x+t.x,this.y+t.y,this.z+t.z)}mul(t){return typeof t=="number"?new d(this.x*t,this.y*t,this.z*t):new d(this.x*t.x,this.y*t.y,this.z*t.z)}div(t){return typeof t=="number"?new d(this.x/t,this.y/t,this.z/t):new d(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),n=Math.sin(t),a=Math.cos(e),h=Math.sin(e),r=Math.cos(s),l=Math.sin(s);return new $([[r*a,r*h*n-l*i,r*h*i+l*n],[l*a,l*h*n+r*i,l*h*i-r*n],[-h,a*n,a*i]])}static randomRotation(){const t=D(),e=D(),s=D();return $.fromEuler(t,e,s)}static fromAxisAngle(t,e){const s=t.x,i=t.y,n=t.z,a=Math.cos(e),h=Math.sin(e),r=1-a,l=r*s*s+a,u=r*s*i-n*h,c=r*s*n+i*h,m=r*i*s+n*h,y=r*i*i+a,f=r*i*n-s*h,et=r*n*s-i*h,L=r*n*i+s*h,se=r*n*n+a;return new $([[l,u,c],[m,y,f],[et,L,se]])}transform(t){return new d(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 n=0;n<3;n++)e[s][i]+=this.data[s][n]*t.data[n][i]}}return new $(e)}get(t,e){return this.data[t][e]}set(t,e,s){this.data[t][e]=s}toArray(){return this.data.map(t=>[...t])}toEuler(){return new d(Math.atan2(this.data[2][1],this.data[2][2]),Math.asin(-this.data[2][0]),Math.atan2(this.data[1][0],this.data[0][0]))}}const k=.005,tt=.001,wt=o=>{Q(o,t=>{let e=d.zero();for(const i of o){const n=i.pos.sub(t.pos),a=n.magnitude**2;if(a===0)continue;const h=Math.sqrt(a),r=tt*i.mass/(h*a),l=n.mul(r);e=e.add(l)}const s=e.mul(k);t.vel=t.vel.add(s),t.pos=t.pos.add(t.vel.mul(k))});for(const t of o){let e=d.zero();for(const i of o){if(t===i)continue;const n=i.pos.sub(t.pos),a=n.magnitude**2;if(a===0)continue;const h=Math.sqrt(a),r=tt*i.mass/(h*a),l=n.mul(r);e=e.add(l)}const s=e.mul(k);t.vel=t.vel.add(s)}for(const t of o)t.pos=t.pos.add(t.vel.mul(k))},Et=o=>{const{minStarCount:t=1500,maxStarCount:e,minGalaxyRadius:s=1,maxGalaxyRadius:i,maxInitialSpeed:n=4,rewindTimeSteps:a=3,initialCollisionAvoidanceOffset:h=1.5}=o,r=d.randomCentered(n),u=r.mul(-a).add(d.randomCentered(h)),c=d.random(Math.PI),m=e?Math.random()*(e-t)+t:t,y=i?Math.random()*(i-s)+s:s,f=new xt(r,u,c,m),et=$.fromEuler(f.rotation.x,f.rotation.y,f.rotation.z);for(let L=0;L<m;L++)f.stars.push(Yt(f,et,y));return f},Yt=(o,t,e=1)=>{const s=2*Math.PI*Math.random(),i=Math.random()*e;let n=Math.random()*Math.exp(-2*(i/e))/5*e;Math.random()<.5&&(n=-n);const a=Math.sqrt(i**2+n**2),h=Math.sqrt(o.mass*tt/a),r=Math.sin(s),l=Math.cos(s),u=new d(i*l,i*r,n),c=new d(-h*r,h*l,0),m=t.transform(u).add(o.pos),y=t.transform(c).add(o.vel);return new St(m,y)};var Zt=Object.defineProperty,Qt=Object.getOwnPropertyDescriptor,A=(o,t,e,s)=>{for(var i=s>1?void 0:s?Qt(t,e):t,n=o.length-1,a;n>=0;n--)(a=o[n])&&(i=(s?a(t,e,i):a(i))||i);return s&&i&&Zt(t,e,i),i};p.GalaxySimulation=class extends P{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 yt`<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(t){(t.has("galaxyCount")||t.has("maxGalaxyCount")||t.has("simulator")||t.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 e=Number(this.rotation)*(Math.PI/180);this._rotation_vector=d.random(e)}else if(typeof this.rotation=="string"){const[t,e,s]=this.rotation.split(",").map(Number),i=t*(Math.PI/180),n=e*(Math.PI/180),a=s*(Math.PI/180);this._rotation_vector=new d(i,n,a)}}_initialiseGalaxies(){this._simulator=this.simulator||{updateGalaxies:wt},this._galaxyFactory=this.galaxyFactory||{createRandomGalaxy:()=>Et({minStarCount:700,maxStarCount:1e3,minGalaxyRadius:.5,maxGalaxyRadius:1.5})};const t=Math.floor(Math.random()*(this.maxGalaxyCount-this.galaxyCount)+this.galaxyCount),e=Math.random()*360,s=360/t;this._galaxies=[];for(let i=0;i<t;i++){const n=this._galaxyFactory.createRandomGalaxy();n.data.color=`hsl(${e+i*s}, 50%, 80%)`,this._galaxies.push(n)}this._step=0}_draw(){if(!this._ctx||!this._canvas)return;const t=this._canvas.width,e=this._canvas.height,s=(t+e)/40*this.zoomFactor;this._ctx.fillStyle="rgba(0, 0, 0, 0.4)",this._ctx.fillRect(0,0,t,e);const i=this._ctx,n=this._galaxies.reduce((h,r)=>h.add(r.pos),new d(0,0,0)).div(this._galaxies.length);let a=$.identity();if(this._rotation_vector){const h=this._rotation_vector.magnitude,r=this._rotation_vector.normalize(),l=h*this._step;a=$.fromAxisAngle(r,l)}Q(this._galaxies,(h,r)=>{if(!r.data.color){const m=`hsl(${Math.random()*360}, 100%, 50%)`;r.data.color=m}i.fillStyle=r.data.color;const l=a?a.transform(h.pos):h.pos,u=Math.floor((l.x-n.x)*s)+t/2,c=Math.floor((l.y-n.y)*s)+e/2;u>=0&&u<t&&c>=0&&c<e&&i.fillRect(u,c,1,1)})}_startAnimation(){this._animationFrameId||this._animate()}_stopAnimation(){this._animationFrameId&&(cancelAnimationFrame(this._animationFrameId),this._animationFrameId=null)}_handleResize(){const t=window.devicePixelRatio||1;this._canvas&&(this._canvas.width=this.clientWidth*t,this._canvas.height=this.clientHeight*t)}},p.GalaxySimulation.styles=nt`
:host {
display: block;
width: 100%;
height: 100%;
}
canvas {
display: block;
width: 100%;
height: 100%;
}
`,A([z({type:Number,attribute:"galaxy-count"})],p.GalaxySimulation.prototype,"galaxyCount",2),A([z({type:Number,attribute:"max-galaxy-count"})],p.GalaxySimulation.prototype,"maxGalaxyCount",2),A([z({type:Number,attribute:"zoom"})],p.GalaxySimulation.prototype,"zoomFactor",2),A([z({type:String,attribute:"rotation"})],p.GalaxySimulation.prototype,"rotation",2),A([z({type:Object,attribute:"simulator"})],p.GalaxySimulation.prototype,"simulator",2),A([z({type:Object,attribute:"galaxy-factory"})],p.GalaxySimulation.prototype,"galaxyFactory",2),A([At("#galaxyCanvas")],p.GalaxySimulation.prototype,"_canvas",2),p.GalaxySimulation=A([gt("galaxy-simulation")],p.GalaxySimulation);var te=Object.defineProperty,ee=Object.getOwnPropertyDescriptor,Ct=(o,t,e,s)=>{for(var i=s>1?void 0:s?ee(t,e):t,n=o.length-1,a;n>=0;n--)(a=o[n])&&(i=(s?a(t,e,i):a(i))||i);return s&&i&&te(t,e,i),i};return p.SimpleGalaxySimulation=class extends P{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 yt`<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 e=["#ffadad","#a0c4ff","#fdffb6"];for(let s=0;s<3;s++){const i=Et({minStarCount:700,maxStarCount:1e3,minGalaxyRadius:.5,maxGalaxyRadius:1.5});i.data.color=e[s%e.length],this._galaxies.push(i)}}_draw(){if(!this._ctx||!this._canvas)return;const{width:t,height:e}=this._canvas;this._ctx.fillStyle="rgba(0, 0, 0, 0.4)",this._ctx.fillRect(0,0,t,e);const s=(t+e)/40;Q(this._galaxies,(i,n)=>{this._ctx.fillStyle=n.data.color;const a=Math.floor(i.pos.x*s)+t/2,h=Math.floor(i.pos.y*s)+e/2;a>=0&&a<t&&h>=0&&h<e&&this._ctx.fillRect(a,h,1,1)})}_startAnimation(){this._animationFrameId||this._animate()}_stopAnimation(){this._animationFrameId&&(cancelAnimationFrame(this._animationFrameId),this._animationFrameId=null)}_handleResize(){if(!this._canvas)return;const t=window.devicePixelRatio||1;this._canvas.width=this.clientWidth*t,this._canvas.height=this.clientHeight*t}},p.SimpleGalaxySimulation.styles=nt`
/* 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%;
}
`,Ct([At("#galaxyCanvas")],p.SimpleGalaxySimulation.prototype,"_canvas",2),p.SimpleGalaxySimulation=Ct([gt("simple-galaxy-simulation")],p.SimpleGalaxySimulation),p.Galaxy=xt,p.Matrix3x3=$,p.Star=St,p.TWO_PI=bt,p.Vec3=d,p.randomAngle=D,p.randomAngleInRange=Xt,Object.defineProperty(p,Symbol.toStringTag,{value:"Module"}),p}({});