# Grass in the wind

> Hundreds of grass blades with a few poppies sway in passing gusts of wind, and the pointer parts them like a hand, on canvas.

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

## Where to use it

A meadow drawn as three layers of tapered blades, darker at the back and brighter in front. Each blade bends with a small spring towards a wind value made of two slow waves plus a gust that travels across the field every few seconds, so the grass ripples like the real thing. A few red poppies ride on top.

The first color is the fresh grass, the second the flowers and the third the deep green at the back. Density sets how thick the meadow is. Sweep the pointer through it and the blades lean away and spring back. Fits outdoor, farming, eco and summer campaign pages.

## Code

### HTML

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

### CSS

```css
.pt-uvq16-grass-wind {
  --c1: #9ccc4a;
  --c2: #ff4f3a;
  --c3: #2f5d3a;
  --k: 1;
  /* velocidad */
  --d: 1;
  /* densidad / escala */
  --o: 1;
  /* opacidad */
  --bg: #05060a;
  --fg: #ffffff;
  --blend: screen;
  min-height: 100vh;
}

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

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

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

### 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);
let G=[],gk="",t=0;
const build=d=>{G=[];const n=Math.round(W/3.4*d);for(let l=0;l<3;l++){const c=Math.round(n*(.55+l*.2));for(let i=0;i<c;i++)G.push({l,x:Math.random()*(W+20)-10,h:H*(.3+.15*l)*(.6+Math.random()*.6),w:1.8+l*1.2+Math.random()*1.8,b:0,bv:0,f:l>0&&Math.random()<.035,ph:Math.random()*6.28,tx:0,ty:0})}};
const loop=()=>{const v=V(),bg=rgb(v.bg),k=W+"x"+H+"x"+v.d;if(k!==gk){gk=k;build(v.d)}t+=.012*v.k;
const sk=x.createLinearGradient(0,0,0,H);sk.addColorStop(0,css(bg));sk.addColorStop(1,css(mix(bg,rgb(v.c1),.25)));x.fillStyle=sk;x.fillRect(0,0,W,H);
const gp=((t*.12)%1.8)-.4,C=[mix(rgb(v.c3),bg,.3),mix(rgb(v.c3),rgb(v.c1),.45),rgb(v.c1)],F=rgb(v.c2);
for(let l=0;l<3;l++){const base=H-(2-l)*H*.05+4;x.fillStyle=css(C[l]);x.beginPath();
for(const g of G){if(g.l!==l)continue;const u=g.x/W,wind=.35*Math.sin(g.x*.008-t*1.6+g.ph*.15)+.18*Math.sin(g.x*.027-t*2.7)+.9*Math.exp(-Math.pow((u-gp)/.12,2))+.15;
let push=0;if(m.on){const dx=g.x-m.x;if(Math.abs(dx)<80&&m.y>base-g.h-40)push=Math.sign(dx)*(1-Math.abs(dx)/80)*1.6}
g.bv+=(wind*.6+push-g.b)*.06*Math.min(2,v.k);g.bv*=.85;g.b+=g.bv;
const tx=g.x+g.b*g.h*.55,ty=base-g.h*(1-.18*Math.min(1,Math.abs(g.b))),cx=g.x+g.b*g.h*.2,cy=base-g.h*.55;g.tx=tx;g.ty=ty;
x.moveTo(g.x-g.w/2,base);x.quadraticCurveTo(cx-g.w*.3,cy,tx,ty);x.quadraticCurveTo(cx+g.w*.3,cy,g.x+g.w/2,base);x.closePath()}
x.fill();x.fillStyle=css(l<2?mix(F,bg,.25):F);x.beginPath();for(const g of G){if(g.l!==l||!g.f)continue;const r=3.4+l*1.8;x.moveTo(g.tx+r,g.ty);x.arc(g.tx,g.ty,r,0,6.2832)}x.fill();x.fillStyle=css(mix(F,[0,0,0],.7));x.beginPath();for(const g of G){if(g.l!==l||!g.f)continue;const r=1.1+l*.5;x.moveTo(g.tx+r,g.ty);x.arc(g.tx,g.ty,r,0,6.2832)}x.fill()}
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-grass-wind"));
```

### React

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

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

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

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

`;

export default function PatternUvq16GrassWind() {
  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);
let G=[],gk="",t=0;
const build=d=>{G=[];const n=Math.round(W/3.4*d);for(let l=0;l<3;l++){const c=Math.round(n*(.55+l*.2));for(let i=0;i<c;i++)G.push({l,x:Math.random()*(W+20)-10,h:H*(.3+.15*l)*(.6+Math.random()*.6),w:1.8+l*1.2+Math.random()*1.8,b:0,bv:0,f:l>0&&Math.random()<.035,ph:Math.random()*6.28,tx:0,ty:0})}};
const loop=()=>{const v=V(),bg=rgb(v.bg),k=W+"x"+H+"x"+v.d;if(k!==gk){gk=k;build(v.d)}t+=.012*v.k;
const sk=x.createLinearGradient(0,0,0,H);sk.addColorStop(0,css(bg));sk.addColorStop(1,css(mix(bg,rgb(v.c1),.25)));x.fillStyle=sk;x.fillRect(0,0,W,H);
const gp=((t*.12)%1.8)-.4,C=[mix(rgb(v.c3),bg,.3),mix(rgb(v.c3),rgb(v.c1),.45),rgb(v.c1)],F=rgb(v.c2);
for(let l=0;l<3;l++){const base=H-(2-l)*H*.05+4;x.fillStyle=css(C[l]);x.beginPath();
for(const g of G){if(g.l!==l)continue;const u=g.x/W,wind=.35*Math.sin(g.x*.008-t*1.6+g.ph*.15)+.18*Math.sin(g.x*.027-t*2.7)+.9*Math.exp(-Math.pow((u-gp)/.12,2))+.15;
let push=0;if(m.on){const dx=g.x-m.x;if(Math.abs(dx)<80&&m.y>base-g.h-40)push=Math.sign(dx)*(1-Math.abs(dx)/80)*1.6}
g.bv+=(wind*.6+push-g.b)*.06*Math.min(2,v.k);g.bv*=.85;g.b+=g.bv;
const tx=g.x+g.b*g.h*.55,ty=base-g.h*(1-.18*Math.min(1,Math.abs(g.b))),cx=g.x+g.b*g.h*.2,cy=base-g.h*.55;g.tx=tx;g.ty=ty;
x.moveTo(g.x-g.w/2,base);x.quadraticCurveTo(cx-g.w*.3,cy,tx,ty);x.quadraticCurveTo(cx+g.w*.3,cy,g.x+g.w/2,base);x.closePath()}
x.fill();x.fillStyle=css(l<2?mix(F,bg,.25):F);x.beginPath();for(const g of G){if(g.l!==l||!g.f)continue;const r=3.4+l*1.8;x.moveTo(g.tx+r,g.ty);x.arc(g.tx,g.ty,r,0,6.2832)}x.fill();x.fillStyle=css(mix(F,[0,0,0],.7));x.beginPath();for(const g of G){if(g.l!==l||!g.f)continue;const r=1.1+l*.5;x.moveTo(g.tx+r,g.ty);x.arc(g.tx,g.ty,r,0,6.2832)}x.fill()}
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-grass-wind"
        style={{
          "--c1": "#9ccc4a",
          "--c2": "#ff4f3a",
          "--c3": "#2f5d3a",
          "--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 “Grass in the wind” block (Backgrounds) from AIMRAN Library to my project.

## What it is
Hundreds of grass blades with a few poppies sway in passing gusts of wind, and the pointer parts them like a hand, on canvas.

## Chosen settings
- Color 1: #9ccc4a
- Color 2: #ff4f3a
- Color 3: #2f5d3a
- 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-grass-wind {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg);
  container-type: size;
  isolation: isolate;
}

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

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

`;

export default function PatternUvq16GrassWind() {
  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);
let G=[],gk="",t=0;
const build=d=>{G=[];const n=Math.round(W/3.4*d);for(let l=0;l<3;l++){const c=Math.round(n*(.55+l*.2));for(let i=0;i<c;i++)G.push({l,x:Math.random()*(W+20)-10,h:H*(.3+.15*l)*(.6+Math.random()*.6),w:1.8+l*1.2+Math.random()*1.8,b:0,bv:0,f:l>0&&Math.random()<.035,ph:Math.random()*6.28,tx:0,ty:0})}};
const loop=()=>{const v=V(),bg=rgb(v.bg),k=W+"x"+H+"x"+v.d;if(k!==gk){gk=k;build(v.d)}t+=.012*v.k;
const sk=x.createLinearGradient(0,0,0,H);sk.addColorStop(0,css(bg));sk.addColorStop(1,css(mix(bg,rgb(v.c1),.25)));x.fillStyle=sk;x.fillRect(0,0,W,H);
const gp=((t*.12)%1.8)-.4,C=[mix(rgb(v.c3),bg,.3),mix(rgb(v.c3),rgb(v.c1),.45),rgb(v.c1)],F=rgb(v.c2);
for(let l=0;l<3;l++){const base=H-(2-l)*H*.05+4;x.fillStyle=css(C[l]);x.beginPath();
for(const g of G){if(g.l!==l)continue;const u=g.x/W,wind=.35*Math.sin(g.x*.008-t*1.6+g.ph*.15)+.18*Math.sin(g.x*.027-t*2.7)+.9*Math.exp(-Math.pow((u-gp)/.12,2))+.15;
let push=0;if(m.on){const dx=g.x-m.x;if(Math.abs(dx)<80&&m.y>base-g.h-40)push=Math.sign(dx)*(1-Math.abs(dx)/80)*1.6}
g.bv+=(wind*.6+push-g.b)*.06*Math.min(2,v.k);g.bv*=.85;g.b+=g.bv;
const tx=g.x+g.b*g.h*.55,ty=base-g.h*(1-.18*Math.min(1,Math.abs(g.b))),cx=g.x+g.b*g.h*.2,cy=base-g.h*.55;g.tx=tx;g.ty=ty;
x.moveTo(g.x-g.w/2,base);x.quadraticCurveTo(cx-g.w*.3,cy,tx,ty);x.quadraticCurveTo(cx+g.w*.3,cy,g.x+g.w/2,base);x.closePath()}
x.fill();x.fillStyle=css(l<2?mix(F,bg,.25):F);x.beginPath();for(const g of G){if(g.l!==l||!g.f)continue;const r=3.4+l*1.8;x.moveTo(g.tx+r,g.ty);x.arc(g.tx,g.ty,r,0,6.2832)}x.fill();x.fillStyle=css(mix(F,[0,0,0],.7));x.beginPath();for(const g of G){if(g.l!==l||!g.f)continue;const r=1.1+l*.5;x.moveTo(g.tx+r,g.ty);x.arc(g.tx,g.ty,r,0,6.2832)}x.fill()}
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-grass-wind"
        style={{
          "--c1": "#9ccc4a",
          "--c2": "#ff4f3a",
          "--c3": "#2f5d3a",
          "--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.
````