# 1-bit dithered screen

> A sphere and rolling waves drawn with Bayer ordered dithering, like a pocket console screen; the pointer moves the light, on canvas.

- Category: [Backgrounds](https://library.aimran.es/components/patterns)
- Built with: HTML + CSS
- Live editor: https://library.aimran.es/blocks/pt-uvq16-dither
- Library: AIMRAN Library (https://library.aimran.es), free, no sign-up, by Aimran Oukham

## Where to use it

A tribute to monochrome handheld screens. A lit sphere and a field of soft waves are computed at low resolution, then every pixel is compared with an 8 by 8 Bayer matrix to decide between two tones, giving that crisp crosshatched shading. The image is scaled up without smoothing so each pixel stays sharp. Great for game studios, retro tech and indie product pages.

The first color is the dark ink, the second the screen and the third tints the sphere. Density sets the pixel size, from chunky to fine. Move the pointer and the light source follows it, shifting the highlight and the shadow on the ground.

## Code

### HTML

```html
<div class="pt-uvq16-dither"><canvas></canvas></div>
```

### CSS

```css
.pt-uvq16-dither {
  --c1: #312f28;
  --c2: #b1afa8;
  --c3: #ffc833;
  --k: 1;
  /* velocidad */
  --d: 1;
  /* densidad / escala */
  --o: 1;
  /* opacidad */
  --bg: #05060a;
  --fg: #ffffff;
  --blend: screen;
  min-height: 100vh;
}

.pt-uvq16-dither {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg);
  container-type: size;
  isolation: isolate;
}

.pt-uvq16-dither>* {
  opacity: var(--o);
}

.pt-uvq16-dither canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.pt-uvq16-dither {
  background: var(--c1);
}

.pt-uvq16-dither canvas {
  image-rendering: pixelated;
}
```

### JavaScript

```js
(function (el) {
const cv=el.querySelector("canvas"),x=cv.getContext("2d");let W=0,H=0,raf=0,LF=null,pend=null,vis=true,dead=false,RF=0;
const RM=matchMedia("(prefers-reduced-motion: reduce)").matches;
const fit=()=>{const r=Math.min(window.devicePixelRatio||1,2),w=el.clientWidth,h=el.clientHeight;if(w===W&&h===H&&cv.width===Math.round(w*r))return;W=w;H=h;cv.width=Math.round(w*r);cv.height=Math.round(h*r);x.setTransform(r,0,0,r,0,0);if(RM&&LF){RF=0;LF()}};
const ro=new ResizeObserver(fit);ro.observe(el);fit();
const io=new IntersectionObserver(e=>{vis=e[e.length-1].isIntersecting;if(vis&&pend&&!dead){const f=pend;pend=null;raf=window.requestAnimationFrame(f)}});io.observe(el);
const requestAnimationFrame=f=>{LF=f;if(dead)return 0;if(RM){if(++RF<90)f();return 0}if(!vis){pend=f;return 0}return window.requestAnimationFrame(f)};
const V=()=>{const s=getComputedStyle(el),g=n=>s.getPropertyValue(n).trim();return{c1:g("--c1"),c2:g("--c2"),c3:g("--c3"),bg:g("--bg")||"#05060a",k:+g("--k")||1,d:+g("--d")||1}};
const pc=document.createElement("canvas").getContext("2d"),CC={};
const rgb=c=>{if(CC[c])return CC[c];pc.fillStyle="#000";pc.fillStyle=c;const s=pc.fillStyle;return CC[c]=s[0]==="#"?[1,3,5].map(i=>parseInt(s.slice(i,i+2),16)):s.slice(s.indexOf("(")+1).split(",").slice(0,3).map(parseFloat)};
const mix=(a,b,p)=>[a[0]+(b[0]-a[0])*p,a[1]+(b[1]-a[1])*p,a[2]+(b[2]-a[2])*p];
const css=(a,o)=>o===undefined?"rgb("+(a[0]|0)+","+(a[1]|0)+","+(a[2]|0)+")":"rgba("+(a[0]|0)+","+(a[1]|0)+","+(a[2]|0)+","+o+")";
const lum=a=>(a[0]*.299+a[1]*.587+a[2]*.114)/255;const m={x:-1e4,y:-1e4,vx:0,vy:0,on:false};const mv=e=>{const r=el.getBoundingClientRect();if(!r.width)return;const nx=(e.clientX-r.left)*W/r.width,ny=(e.clientY-r.top)*H/r.height;if(m.on){m.vx=nx-m.x;m.vy=ny-m.y}m.x=nx;m.y=ny;m.on=true};const lv=()=>{m.on=false;m.x=m.y=-1e4;m.vx=m.vy=0};el.addEventListener("pointermove",mv);el.addEventListener("pointerdown",mv);el.addEventListener("pointerleave",lv);el.addEventListener("pointercancel",lv);
const BY=[0,32,8,40,2,34,10,42,48,16,56,24,50,18,58,26,12,44,4,36,14,46,6,38,60,28,52,20,62,30,54,22,3,35,11,43,1,33,9,41,51,19,59,27,49,17,57,25,15,47,7,39,13,45,5,37,63,31,55,23,61,29,53,21];
const o=document.createElement("canvas"),g=o.getContext("2d");let img=null,buf=null,t=0,lx=.6,ly=-.6;
const pk=c=>((255<<24)|((c[2]|0)<<16)|((c[1]|0)<<8)|(c[0]|0))>>>0;
const loop=()=>{const v=V(),p=Math.max(2,Math.round(4/v.d)),gw=Math.max(1,Math.ceil(W/p)),gh=Math.max(1,Math.ceil(H/p));
if(!img||o.width!==gw||o.height!==gh){o.width=gw;o.height=gh;img=g.createImageData(gw,gh);buf=new Uint32Array(img.data.buffer)}
const D0=pk(rgb(v.c1)),D1=pk(rgb(v.c2)),D2=pk(rgb(v.c3));t+=.012*v.k;
let tx=Math.cos(t*.7)*.9,ty=-.5+Math.sin(t*.5)*.4;if(m.on){tx=(m.x/W-.5)*3;ty=(m.y/H-.5)*3}lx+=(tx-lx)*.12;ly+=(ty-ly)*.12;
const ln=Math.hypot(lx,ly,1),Lx=lx/ln,Ly=ly/ln,Lz=1/ln,cx=gw/2+Math.sin(t*.4)*gw*.06,cy=gh*.44+Math.cos(t*.6)*gh*.04,R=Math.min(gw,gh)*.27,shx=cx-Lx*R*.6,shy=cy+R*1.12;
for(let j=0;j<gh;j++){const by=(j&7)*8;for(let i=0;i<gw;i++){const dx=(i-cx)/R,dy=(j-cy)/R,d2=dx*dx+dy*dy,b=BY[by+(i&7)];
if(d2<1){const z=Math.sqrt(1-d2),df=Math.max(0,dx*Lx+dy*Ly+z*Lz),rz=2*df*z-Lz,l=.04+.8*df,sp=rz>0?Math.pow(rz,18):0;buf[j*gw+i]=sp*64>b?D1:l*64>b?D2:D0}
else{const ex=(i-shx)/(R*1.05),ey=(j-shy)/(R*.22),sh=ex*ex+ey*ey;let l=.48+.3*Math.sin(i*.06+t*1.3+Math.sin(j*.045-t)*1.6)*Math.cos(j*.05-t*.7)+(j/gh-.5)*.35;if(sh<1)l*=.25+.75*sh;buf[j*gw+i]=l*64>b?D1:D0}}}
g.putImageData(img,0,0);x.imageSmoothingEnabled=false;x.drawImage(o,0,0,gw*p,gh*p);raf=requestAnimationFrame(loop)};loop();
return()=>{dead=true;cancelAnimationFrame(raf);ro.disconnect();io.disconnect();el.removeEventListener("pointermove",mv);el.removeEventListener("pointerdown",mv);el.removeEventListener("pointerleave",lv);el.removeEventListener("pointercancel",lv)};
})(document.querySelector(".pt-uvq16-dither"));
```

### React

```tsx
// @ts-nocheck
import { useEffect, useRef } from "react";

const css = `
.pt-uvq16-dither {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg);
  container-type: size;
  isolation: isolate;
}

.pt-uvq16-dither>* {
  opacity: var(--o);
}

.pt-uvq16-dither canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.pt-uvq16-dither {
  background: var(--c1);
}

.pt-uvq16-dither canvas {
  image-rendering: pixelated;
}

`;

export default function PatternUvq16Dither() {
  const ref = useRef(null);
  useEffect(() => {
    const el = ref.current;
    if (!el) return;
const cv=el.querySelector("canvas"),x=cv.getContext("2d");let W=0,H=0,raf=0,LF=null,pend=null,vis=true,dead=false,RF=0;
const RM=matchMedia("(prefers-reduced-motion: reduce)").matches;
const fit=()=>{const r=Math.min(window.devicePixelRatio||1,2),w=el.clientWidth,h=el.clientHeight;if(w===W&&h===H&&cv.width===Math.round(w*r))return;W=w;H=h;cv.width=Math.round(w*r);cv.height=Math.round(h*r);x.setTransform(r,0,0,r,0,0);if(RM&&LF){RF=0;LF()}};
const ro=new ResizeObserver(fit);ro.observe(el);fit();
const io=new IntersectionObserver(e=>{vis=e[e.length-1].isIntersecting;if(vis&&pend&&!dead){const f=pend;pend=null;raf=window.requestAnimationFrame(f)}});io.observe(el);
const requestAnimationFrame=f=>{LF=f;if(dead)return 0;if(RM){if(++RF<90)f();return 0}if(!vis){pend=f;return 0}return window.requestAnimationFrame(f)};
const V=()=>{const s=getComputedStyle(el),g=n=>s.getPropertyValue(n).trim();return{c1:g("--c1"),c2:g("--c2"),c3:g("--c3"),bg:g("--bg")||"#05060a",k:+g("--k")||1,d:+g("--d")||1}};
const pc=document.createElement("canvas").getContext("2d"),CC={};
const rgb=c=>{if(CC[c])return CC[c];pc.fillStyle="#000";pc.fillStyle=c;const s=pc.fillStyle;return CC[c]=s[0]==="#"?[1,3,5].map(i=>parseInt(s.slice(i,i+2),16)):s.slice(s.indexOf("(")+1).split(",").slice(0,3).map(parseFloat)};
const mix=(a,b,p)=>[a[0]+(b[0]-a[0])*p,a[1]+(b[1]-a[1])*p,a[2]+(b[2]-a[2])*p];
const css=(a,o)=>o===undefined?"rgb("+(a[0]|0)+","+(a[1]|0)+","+(a[2]|0)+")":"rgba("+(a[0]|0)+","+(a[1]|0)+","+(a[2]|0)+","+o+")";
const lum=a=>(a[0]*.299+a[1]*.587+a[2]*.114)/255;const m={x:-1e4,y:-1e4,vx:0,vy:0,on:false};const mv=e=>{const r=el.getBoundingClientRect();if(!r.width)return;const nx=(e.clientX-r.left)*W/r.width,ny=(e.clientY-r.top)*H/r.height;if(m.on){m.vx=nx-m.x;m.vy=ny-m.y}m.x=nx;m.y=ny;m.on=true};const lv=()=>{m.on=false;m.x=m.y=-1e4;m.vx=m.vy=0};el.addEventListener("pointermove",mv);el.addEventListener("pointerdown",mv);el.addEventListener("pointerleave",lv);el.addEventListener("pointercancel",lv);
const BY=[0,32,8,40,2,34,10,42,48,16,56,24,50,18,58,26,12,44,4,36,14,46,6,38,60,28,52,20,62,30,54,22,3,35,11,43,1,33,9,41,51,19,59,27,49,17,57,25,15,47,7,39,13,45,5,37,63,31,55,23,61,29,53,21];
const o=document.createElement("canvas"),g=o.getContext("2d");let img=null,buf=null,t=0,lx=.6,ly=-.6;
const pk=c=>((255<<24)|((c[2]|0)<<16)|((c[1]|0)<<8)|(c[0]|0))>>>0;
const loop=()=>{const v=V(),p=Math.max(2,Math.round(4/v.d)),gw=Math.max(1,Math.ceil(W/p)),gh=Math.max(1,Math.ceil(H/p));
if(!img||o.width!==gw||o.height!==gh){o.width=gw;o.height=gh;img=g.createImageData(gw,gh);buf=new Uint32Array(img.data.buffer)}
const D0=pk(rgb(v.c1)),D1=pk(rgb(v.c2)),D2=pk(rgb(v.c3));t+=.012*v.k;
let tx=Math.cos(t*.7)*.9,ty=-.5+Math.sin(t*.5)*.4;if(m.on){tx=(m.x/W-.5)*3;ty=(m.y/H-.5)*3}lx+=(tx-lx)*.12;ly+=(ty-ly)*.12;
const ln=Math.hypot(lx,ly,1),Lx=lx/ln,Ly=ly/ln,Lz=1/ln,cx=gw/2+Math.sin(t*.4)*gw*.06,cy=gh*.44+Math.cos(t*.6)*gh*.04,R=Math.min(gw,gh)*.27,shx=cx-Lx*R*.6,shy=cy+R*1.12;
for(let j=0;j<gh;j++){const by=(j&7)*8;for(let i=0;i<gw;i++){const dx=(i-cx)/R,dy=(j-cy)/R,d2=dx*dx+dy*dy,b=BY[by+(i&7)];
if(d2<1){const z=Math.sqrt(1-d2),df=Math.max(0,dx*Lx+dy*Ly+z*Lz),rz=2*df*z-Lz,l=.04+.8*df,sp=rz>0?Math.pow(rz,18):0;buf[j*gw+i]=sp*64>b?D1:l*64>b?D2:D0}
else{const ex=(i-shx)/(R*1.05),ey=(j-shy)/(R*.22),sh=ex*ex+ey*ey;let l=.48+.3*Math.sin(i*.06+t*1.3+Math.sin(j*.045-t)*1.6)*Math.cos(j*.05-t*.7)+(j/gh-.5)*.35;if(sh<1)l*=.25+.75*sh;buf[j*gw+i]=l*64>b?D1:D0}}}
g.putImageData(img,0,0);x.imageSmoothingEnabled=false;x.drawImage(o,0,0,gw*p,gh*p);raf=requestAnimationFrame(loop)};loop();
return()=>{dead=true;cancelAnimationFrame(raf);ro.disconnect();io.disconnect();el.removeEventListener("pointermove",mv);el.removeEventListener("pointerdown",mv);el.removeEventListener("pointerleave",lv);el.removeEventListener("pointercancel",lv)};
  }, []);
  return (
    <>
      <style>{css}</style>
      <div
        ref={ref}
        className="pt-uvq16-dither"
        style={{
          "--c1": "#312f28",
          "--c2": "#b1afa8",
          "--c3": "#ffc833",
          "--k": 1,
          "--d": 1,
          "--o": 1,
          "--bg": "#05060a",
          "--fg": "#ffffff",
          "--blend": "screen",
          minHeight: "100vh",
        }}
      >
        <canvas></canvas>
      </div>
    </>
  );
}
```

## Prompt for AI assistants

Paste this into ChatGPT, Claude, Cursor, v0 or Lovable to adapt the block to your stack (Tailwind, Vue, Svelte…):

````text
I want to add the “1-bit dithered screen” block (Backgrounds) from AIMRAN Library to my project.

## What it is
A sphere and rolling waves drawn with Bayer ordered dithering, like a pocket console screen; the pointer moves the light, on canvas.

## Chosen settings
- Color 1: #312f28
- Color 2: #b1afa8
- Color 3: #ffc833
- Speed: 1x (from 0.2 to 3x)
- Density / scale: 1x (from 0.5 to 2x)
- Opacity: 1 (from 0.2 to 1)

## What I need
1. Add it to my project with the same look and animation as the reference code: same sizes, colours, radii, shadows, timings and easing.
2. It is built with plain HTML and CSS (the reference wraps it in a React component with its CSS). If my project uses something else (Vue, Svelte, Astro, plain HTML…), translate it without losing any behaviour. If I use Tailwind, turn the styles into classes; if not, keep the CSS in its own file.
3. Expose the settings above as props (or CSS variables) with those values as defaults.
4. Make it work well on phones: nothing that depends only on hover, touch targets of at least 44 px and no overflow on 320 px screens.
5. Make it look right in light and dark mode.
6. Keep it accessible: semantic HTML, roles and aria-* where needed, visible focus and keyboard support.
7. Respect prefers-reduced-motion: with reduced motion, no big animations but the same end result.

## Reference code
```tsx
// @ts-nocheck
import { useEffect, useRef } from "react";

const css = `
.pt-uvq16-dither {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg);
  container-type: size;
  isolation: isolate;
}

.pt-uvq16-dither>* {
  opacity: var(--o);
}

.pt-uvq16-dither canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.pt-uvq16-dither {
  background: var(--c1);
}

.pt-uvq16-dither canvas {
  image-rendering: pixelated;
}

`;

export default function PatternUvq16Dither() {
  const ref = useRef(null);
  useEffect(() => {
    const el = ref.current;
    if (!el) return;
const cv=el.querySelector("canvas"),x=cv.getContext("2d");let W=0,H=0,raf=0,LF=null,pend=null,vis=true,dead=false,RF=0;
const RM=matchMedia("(prefers-reduced-motion: reduce)").matches;
const fit=()=>{const r=Math.min(window.devicePixelRatio||1,2),w=el.clientWidth,h=el.clientHeight;if(w===W&&h===H&&cv.width===Math.round(w*r))return;W=w;H=h;cv.width=Math.round(w*r);cv.height=Math.round(h*r);x.setTransform(r,0,0,r,0,0);if(RM&&LF){RF=0;LF()}};
const ro=new ResizeObserver(fit);ro.observe(el);fit();
const io=new IntersectionObserver(e=>{vis=e[e.length-1].isIntersecting;if(vis&&pend&&!dead){const f=pend;pend=null;raf=window.requestAnimationFrame(f)}});io.observe(el);
const requestAnimationFrame=f=>{LF=f;if(dead)return 0;if(RM){if(++RF<90)f();return 0}if(!vis){pend=f;return 0}return window.requestAnimationFrame(f)};
const V=()=>{const s=getComputedStyle(el),g=n=>s.getPropertyValue(n).trim();return{c1:g("--c1"),c2:g("--c2"),c3:g("--c3"),bg:g("--bg")||"#05060a",k:+g("--k")||1,d:+g("--d")||1}};
const pc=document.createElement("canvas").getContext("2d"),CC={};
const rgb=c=>{if(CC[c])return CC[c];pc.fillStyle="#000";pc.fillStyle=c;const s=pc.fillStyle;return CC[c]=s[0]==="#"?[1,3,5].map(i=>parseInt(s.slice(i,i+2),16)):s.slice(s.indexOf("(")+1).split(",").slice(0,3).map(parseFloat)};
const mix=(a,b,p)=>[a[0]+(b[0]-a[0])*p,a[1]+(b[1]-a[1])*p,a[2]+(b[2]-a[2])*p];
const css=(a,o)=>o===undefined?"rgb("+(a[0]|0)+","+(a[1]|0)+","+(a[2]|0)+")":"rgba("+(a[0]|0)+","+(a[1]|0)+","+(a[2]|0)+","+o+")";
const lum=a=>(a[0]*.299+a[1]*.587+a[2]*.114)/255;const m={x:-1e4,y:-1e4,vx:0,vy:0,on:false};const mv=e=>{const r=el.getBoundingClientRect();if(!r.width)return;const nx=(e.clientX-r.left)*W/r.width,ny=(e.clientY-r.top)*H/r.height;if(m.on){m.vx=nx-m.x;m.vy=ny-m.y}m.x=nx;m.y=ny;m.on=true};const lv=()=>{m.on=false;m.x=m.y=-1e4;m.vx=m.vy=0};el.addEventListener("pointermove",mv);el.addEventListener("pointerdown",mv);el.addEventListener("pointerleave",lv);el.addEventListener("pointercancel",lv);
const BY=[0,32,8,40,2,34,10,42,48,16,56,24,50,18,58,26,12,44,4,36,14,46,6,38,60,28,52,20,62,30,54,22,3,35,11,43,1,33,9,41,51,19,59,27,49,17,57,25,15,47,7,39,13,45,5,37,63,31,55,23,61,29,53,21];
const o=document.createElement("canvas"),g=o.getContext("2d");let img=null,buf=null,t=0,lx=.6,ly=-.6;
const pk=c=>((255<<24)|((c[2]|0)<<16)|((c[1]|0)<<8)|(c[0]|0))>>>0;
const loop=()=>{const v=V(),p=Math.max(2,Math.round(4/v.d)),gw=Math.max(1,Math.ceil(W/p)),gh=Math.max(1,Math.ceil(H/p));
if(!img||o.width!==gw||o.height!==gh){o.width=gw;o.height=gh;img=g.createImageData(gw,gh);buf=new Uint32Array(img.data.buffer)}
const D0=pk(rgb(v.c1)),D1=pk(rgb(v.c2)),D2=pk(rgb(v.c3));t+=.012*v.k;
let tx=Math.cos(t*.7)*.9,ty=-.5+Math.sin(t*.5)*.4;if(m.on){tx=(m.x/W-.5)*3;ty=(m.y/H-.5)*3}lx+=(tx-lx)*.12;ly+=(ty-ly)*.12;
const ln=Math.hypot(lx,ly,1),Lx=lx/ln,Ly=ly/ln,Lz=1/ln,cx=gw/2+Math.sin(t*.4)*gw*.06,cy=gh*.44+Math.cos(t*.6)*gh*.04,R=Math.min(gw,gh)*.27,shx=cx-Lx*R*.6,shy=cy+R*1.12;
for(let j=0;j<gh;j++){const by=(j&7)*8;for(let i=0;i<gw;i++){const dx=(i-cx)/R,dy=(j-cy)/R,d2=dx*dx+dy*dy,b=BY[by+(i&7)];
if(d2<1){const z=Math.sqrt(1-d2),df=Math.max(0,dx*Lx+dy*Ly+z*Lz),rz=2*df*z-Lz,l=.04+.8*df,sp=rz>0?Math.pow(rz,18):0;buf[j*gw+i]=sp*64>b?D1:l*64>b?D2:D0}
else{const ex=(i-shx)/(R*1.05),ey=(j-shy)/(R*.22),sh=ex*ex+ey*ey;let l=.48+.3*Math.sin(i*.06+t*1.3+Math.sin(j*.045-t)*1.6)*Math.cos(j*.05-t*.7)+(j/gh-.5)*.35;if(sh<1)l*=.25+.75*sh;buf[j*gw+i]=l*64>b?D1:D0}}}
g.putImageData(img,0,0);x.imageSmoothingEnabled=false;x.drawImage(o,0,0,gw*p,gh*p);raf=requestAnimationFrame(loop)};loop();
return()=>{dead=true;cancelAnimationFrame(raf);ro.disconnect();io.disconnect();el.removeEventListener("pointermove",mv);el.removeEventListener("pointerdown",mv);el.removeEventListener("pointerleave",lv);el.removeEventListener("pointercancel",lv)};
  }, []);
  return (
    <>
      <style>{css}</style>
      <div
        ref={ref}
        className="pt-uvq16-dither"
        style={{
          "--c1": "#312f28",
          "--c2": "#b1afa8",
          "--c3": "#ffc833",
          "--k": 1,
          "--d": 1,
          "--o": 1,
          "--bg": "#05060a",
          "--fg": "#ffffff",
          "--blend": "screen",
          minHeight: "100vh",
        }}
      >
        <canvas></canvas>
      </div>
    </>
  );
}
```

Give me the complete final code, ready to paste, and tell me in one line where to put it in my project.
````