Air quality matrix heatmap
Complete a matrix heatmap in an air-quality scenario: includes realistic content, interactive controls, clear state feedback, and responsive layouts.
With JavaScript enabled, you can edit, run, and save this example. The fixed source is as follows:
<!doctype html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Air quality matrix heatmap</title>
<style>
:root { --ink:#252525; --paper:#f7f2e8; --accent:#247ba0; --secondary:#f4b942; --line:color-mix(in srgb, var(--ink) 18%, transparent); --shadow:0 24px 60px color-mix(in srgb, var(--ink) 16%, transparent); color-scheme:light; }
* { box-sizing:border-box; }
html { min-width:320px; background:var(--paper); }
body { min-height:100vh; margin:0; overflow-x:hidden; color:var(--ink); font-family:"DIN Alternate","Arial Narrow",sans-serif; background:repeating-linear-gradient(135deg,color-mix(in srgb,var(--ink) 5%,transparent) 0 1px,transparent 1px 18px),var(--paper); }
button,input,select,textarea { color:inherit; font:inherit; }
button,[role="button"],input,select,textarea { accent-color:var(--accent); }
button { cursor:pointer; }
button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible { outline:3px solid var(--accent); outline-offset:3px; }
[hidden] { display:none !important; }
@media (max-width:700px) { .mast h1 { line-height:1.08 !important; letter-spacing:-.035em !important; overflow-wrap:anywhere; } }
@media (prefers-reduced-motion:reduce) { *,*::before,*::after { scroll-behavior:auto !important; animation-duration:.01ms !important; animation-iteration-count:1 !important; transition-duration:.01ms !important; } }
.mast{display:flex;justify-content:space-between;border-bottom:6px solid var(--ink);padding-bottom:18px;gap:20px;align-items:flex-end;margin:0 0 22px}.page{width:min(1240px,calc(100% - 28px));margin:auto;padding:34px 0 70px}.scenario{padding:8px 12px;border:2px solid var(--ink);font:900 12px/1 ui-monospace,monospace}.mast h1{font-family:"DIN Condensed","Arial Narrow",sans-serif;font-weight:900;text-transform:uppercase;font-size:clamp(44px,10vw,104px);letter-spacing:-.02em;max-width:1000px;margin:0;line-height:.82}.intro{max-width:720px;font-family:"Arial Narrow",sans-serif;line-height:1.5}.eyebrow{display:inline-block;padding:6px 9px;color:var(--paper);background:var(--accent);font:900 10px/1 ui-monospace,monospace;letter-spacing:.12em}.demo{border-radius:3px;box-shadow:10px 10px 0 var(--accent);position:relative;min-height:400px;overflow:hidden;padding:32px;background:var(--paper)}@media(max-width:700px){.mast{display:grid;grid-template-columns:1fr}.page{width:calc(100% - 16px);padding-top:16px}.demo{padding:14px}}
.panel{padding:16px;border:3px double var(--accent);background:var(--paper)}.stack{display:grid;gap:14px}.row{display:grid;grid-auto-flow:column;grid-auto-columns:max-content;gap:10px;overflow:auto}.action{padding:10px 15px;border:1px solid var(--accent);background:transparent;font-family:Didot,serif;letter-spacing:.06em}.action.primary,.action.is-active{color:var(--paper);background:var(--ink)}.metric{font-family:Didot,serif;font-size:clamp(36px,8vw,74px);letter-spacing:.04em}.status{min-height:24px;padding:9px;border-inline:1px solid var(--accent);text-align:center}.muted{line-height:1.8}.chip{padding:5px 14px;border-inline:1px solid var(--accent);letter-spacing:.1em}.meter{height:5px;background:var(--line)}.meter>i{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--secondary))}
.composition-split{display:grid;grid-template-columns:150px minmax(0,1fr);gap:18px;align-items:start}.split-note{position:sticky;top:20px;display:grid;gap:14px;padding:18px 12px;border-block:3px double var(--accent);font-size:13px;line-height:1.65}.split-note b{font:900 12px/1 ui-monospace,monospace;letter-spacing:.12em}.split-note span{writing-mode:vertical-rl;min-height:120px;color:color-mix(in srgb,var(--ink) 60%,transparent)}.composition-split .demo{min-width:0}@media(max-width:900px){.composition-split{grid-template-columns:1fr}.split-note{position:static;grid-template-columns:auto 1fr}.split-note span{writing-mode:horizontal-tb;min-height:0}}
.canvas-shell{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(230px,.6fr);gap:16px}.canvas-shell canvas{width:100%;height:440px;border:1px solid var(--line);border-radius:18px;background:var(--ink)}.canvas-tools{display:grid;align-content:center;gap:16px}.canvas-tools label{display:grid;gap:8px;font-weight:800}@media(max-width:900px){.canvas-shell{grid-template-columns:1fr}.canvas-shell canvas{height:300px}}.drawing-pattern{display:grid;gap:14px}.heatmap-controller{display:grid;grid-template-columns:1fr 180px 210px auto auto;gap:15px;align-items:center;padding:18px;background:repeating-linear-gradient(90deg,color-mix(in srgb,var(--accent) 9%,transparent) 0 24px,transparent 24px 48px),var(--paper)}.heatmap-controller h3{margin:.2em 0}.heatmap-controller label{display:grid;grid-template-columns:1fr auto;gap:6px}.heatmap-controller label select,.heatmap-controller label input[type="range"]{grid-column:1/-1}.heatmap-normalize{display:flex!important}.heatmap-controller>output{padding:8px 12px;color:var(--paper);background:linear-gradient(90deg,var(--secondary),var(--accent))}@media(max-width:900px){.heatmap-controller{grid-template-columns:1fr 1fr}.heatmap-controller header{grid-column:1/-1}}.workflow-dispatch{display:grid;grid-template-columns:minmax(210px,.48fr) minmax(0,1.52fr);gap:18px}.dispatch-console{display:grid;align-content:start;gap:16px;padding:22px;border:1px solid var(--line);border-radius:18px;background:color-mix(in srgb,var(--secondary) 12%,var(--paper))}.dispatch-console h2{margin:.2em 0}.dispatch-console form,.dispatch-console label{display:grid;gap:7px}.dispatch-console input,.dispatch-console select{min-width:0;width:100%;padding:10px;border:1px solid var(--line);border-radius:8px;background:var(--paper)}.dispatch-console fieldset{display:flex;gap:12px;border:1px solid var(--line);border-radius:10px}.dispatch-console fieldset label{display:flex;align-items:center}.dispatch-workbench{--dispatch-load:.22;min-width:0;padding:14px;border-left:8px solid color-mix(in srgb,var(--accent) calc(var(--dispatch-load)*100%),var(--line));background:linear-gradient(90deg,color-mix(in srgb,var(--accent) 8%,transparent),transparent 28%)}.dispatch-workbench[data-dispatch-priority="urgent"]{box-shadow:inset 0 0 0 2px var(--accent)}@media(max-width:900px){.workflow-dispatch{grid-template-columns:1fr}.dispatch-console{order:2}}
</style>
</head>
<body data-aesthetic="industrial" data-composition="split-note">
<main class="page">
<header class="mast"><div><span class="eyebrow">industrial / matrix heatmap / INTERMEDIATE</span><h1>Air quality matrix heatmap</h1><p class="intro">Complete a matrix heatmap in an air-quality scenario: includes realistic content, interactive controls, clear state feedback, and responsive layouts.</p></div><span class="scenario">Air Quality</span></header>
<div class="composition-split"><aside class="split-note"><b>CASE 02</b><span>Master the semantic structure, responsive composition, keyboard interaction, and state synchronization of matrix heatmaps.</span></aside><section class="demo" aria-label="Air Quality Matrix Heatmap interactive area"><div class="workflow-dispatch"><aside class="dispatch-console"><span class="eyebrow">Air Quality DISPATCH</span><h2>Air Station Control Desk</h2><form id="workflowDispatchForm"><label>Task Type<select id="workflowDispatchKind"><option>Roadside Station</option><option>Park Station</option><option>Community Station</option></select></label><label>AQI threshold<input id="workflowDispatchAmount" type="number" min="1" max="9999" value="36"><span>AQI</span></label><fieldset><legend>Processing priority</legend><label><input type="radio" name="workflowPriority" value="normal" checked>Regular</label><label><input type="radio" name="workflowPriority" value="urgent">Urgent</label></fieldset><button class="action primary" type="submit">Start monitoring</button></form><label>Current task<select id="workflowDispatchActive" aria-label="Switch current task"><option value="1">Roadside Station</option><option value="2">Park Station</option></select></label><output id="workflowDispatchSummary">Waiting for Dispatch</output></aside><section id="workflowCore" class="workflow-core dispatch-workbench" data-dispatch-priority="normal"><!-- 11DZ_CORE_START:drawing-data-viz-heatmap-grid --><div class="drawing-pattern drawing-pattern-6"><div class="canvas-shell"><canvas id="artboard" width="900" height="440" aria-label="Matrix heatmap canvas" aria-describedby="canvasDescription"></canvas><div class="canvas-tools panel"><span class="eyebrow">CANVAS MODE 7</span><h2>Matrix heatmap</h2><label>Complexity <input id="canvasAmount" type="range" min="4" max="28" value="28"></label><button id="redrawCanvas" class="action primary" type="button">Redraw</button><p id="canvasDescription" class="muted">On a dark canvas, a matrix heatmap is drawn with two high-contrast colors, and the complexity slider determines the number of shapes; everything is generated locally in the browser.</p></div></div><section class="drawing-controller heatmap-controller"><header><span class="eyebrow">MATRIX SCALE</span><h3>Air Quality Heatmap Matrix</h3></header><label>Color scale<select id="heatmapPalette"><option value="sequential">Continuous Gradient</option><option value="diverging">Diverging color scale</option><option value="threshold">Threshold Color Scale</option></select></label><label>Matrix Edge Length<input id="heatmapCells" type="range" min="4" max="12" value="8" data-core-bridge="drawing-data-viz-heatmap-grid"><output id="heatmapCellsValue">8 × 8</output></label><label class="heatmap-normalize"><input id="heatmapNormalize" type="checkbox">Normalize by row</label><output id="heatmapLegend">Low → High</output></section></div><!-- 11DZ_CORE_END --></section></div><p id="status" class="status" role="status" aria-live="polite"></p></section></div>
</main>
<script>
'use strict';
const statusOutput = document.querySelector('#status');
const announce = message => { statusOutput.textContent = message; };
/* 11DZ_CORE_SCRIPT_START:drawing-data-viz-heatmap-grid */
const canvas = document.querySelector('#artboard'); const context = canvas.getContext('2d'); const amount = document.querySelector('#canvasAmount'); let drawSeed = 2907511509;
function random(){ drawSeed = (drawSeed * 1664525 + 1013904223) >>> 0; return drawSeed / 4294967296; }
function drawCanvas(){ const rect = canvas.getBoundingClientRect(); const ratio = Math.min(2,window.devicePixelRatio || 1); canvas.width = Math.max(320,Math.round(rect.width * ratio)); canvas.height = Math.max(240,Math.round(rect.height * ratio)); context.setTransform(ratio,0,0,ratio,0,0); const width = rect.width; const height = rect.height; context.clearRect(0,0,width,height); context.fillStyle = '#252525'; context.fillRect(0,0,width,height); const drawingFactor=Number(canvas.dataset.drawingFactor||1); const count=Math.max(1,Math.round(Number(amount.value)*drawingFactor)); drawSeed += 1+Number(canvas.dataset.drawingShift||0); context.globalCompositeOperation=canvas.dataset.drawingBlend||'source-over';
for(let index=0; index<count; index+=1){ const x=random()*width; const y=random()*height; const size=(10+random()*70)*Math.max(.45,drawingFactor); context.beginPath(); context.strokeStyle=index%2?'#247ba0':'#f4b942'; context.fillStyle=context.strokeStyle+'88'; context.lineWidth=(2+random()*4)*Math.max(.6,drawingFactor);
const cell=Math.max(12,width/Math.ceil(Math.sqrt(count))); context.globalAlpha=.25+random()*.7; context.fillRect((index%8)*cell,Math.floor(index/8)*cell,cell-3,cell-3); context.globalAlpha=1;
} context.globalCompositeOperation='source-over'; announce('Canvas generated ' + count + ' graphic elements'); }
document.querySelector('#redrawCanvas').addEventListener('click',drawCanvas); amount.addEventListener('input',drawCanvas); addEventListener('resize',drawCanvas,{passive:true}); drawCanvas();
const heatmapPalette=document.querySelector('#heatmapPalette');const heatmapCells=document.querySelector('#heatmapCells');const heatmapNormalize=document.querySelector('#heatmapNormalize');const heatmapState={palette:'sequential',side:8,normalize:false};function reshapeHeatmap(){heatmapState.palette=heatmapPalette.value;heatmapState.side=Number(heatmapCells.value);heatmapState.normalize=heatmapNormalize.checked;document.querySelector('#heatmapCellsValue').textContent=heatmapState.side+' × '+heatmapState.side;document.querySelector('#heatmapLegend').textContent={sequential:'Low → High',diverging:'Negative ← Center → Positive',threshold:'Normal / Attention / Risk'}[heatmapState.palette];amount.value=String(Math.min(Number(amount.max),Math.max(Number(amount.min),heatmapState.side)));canvas.dataset.drawingFactor=String(heatmapState.normalize?.82:1.08);canvas.dataset.drawingShift=String(['sequential','diverging','threshold'].indexOf(heatmapState.palette)*31+heatmapState.side);canvas.dataset.drawingBlend=heatmapState.palette==='diverging'?'screen':'source-over';drawCanvas();}heatmapPalette.addEventListener('change',reshapeHeatmap);heatmapCells.addEventListener('input',reshapeHeatmap);heatmapNormalize.addEventListener('change',reshapeHeatmap);reshapeHeatmap();
/* 11DZ_CORE_SCRIPT_END */
const workflowBridgeSpec={"name":"drawing-data-viz-heatmap-grid","selector":"[data-core-bridge=\"drawing-data-viz-heatmap-grid\"]","mode":"range","key":"ArrowRight"};const workflowBridgeCore=document.querySelector('#workflowCore');const workflowBridgeControl=workflowBridgeCore.querySelector(workflowBridgeSpec.selector);if(!workflowBridgeControl)throw new Error('Missing core bridge: '+workflowBridgeSpec.name);const workflowBridgeControlledId=workflowBridgeControl.getAttribute('aria-controls');const workflowBridgeControlled=workflowBridgeControlledId?document.getElementById(workflowBridgeControlledId):null;workflowBridgeCore.dataset.workflowBridge=workflowBridgeSpec.name;workflowBridgeCore.dataset.workflowVersion='0';function workflowBridgeSerialize(){const visualNode=workflowBridgeCore.firstElementChild||workflowBridgeCore;const visual=getComputedStyle(visualNode);const outputs=[...workflowBridgeCore.querySelectorAll('output,[role="status"],[aria-live],meter,progress')].map(node=>node.textContent.trim()+'|'+node.getAttribute('aria-valuenow')+'|'+node.getAttribute('value'));const canvas=[...workflowBridgeCore.querySelectorAll('canvas')].map(node=>{try{return node.toDataURL().slice(-160);}catch{return 'canvas-unavailable';}});return JSON.stringify({html:workflowBridgeCore.innerHTML,status:statusOutput.textContent,outputs,canvas,visual:[visual.display,visual.visibility,visual.opacity,visual.transform,visual.filter,visual.backgroundColor,visual.width,visual.height],scroll:workflowBridgeSpec.mode==='scroll'?workflowBridgeControl.scrollTop:null});}let workflowBridgeLastEffect=workflowBridgeSerialize();function workflowBridgeSummary(){const label=(workflowBridgeControl.getAttribute('aria-label')||workflowBridgeControl.textContent||workflowBridgeControl.value||workflowBridgeSpec.name).trim().replace(/\s+/g,' ').slice(0,72);return label+' · Core Version '+workflowBridgeCore.dataset.workflowVersion;}function workflowBridgeCommit(){const effect=workflowBridgeSerialize();if(effect===workflowBridgeLastEffect)return {changed:false,summary:workflowBridgeSummary()};workflowBridgeLastEffect=effect;workflowBridgeCore.dataset.workflowVersion=String(Number(workflowBridgeCore.dataset.workflowVersion||0)+1);return {changed:true,summary:workflowBridgeSummary()};}function workflowBridgeScheduleCommit(){queueMicrotask(workflowBridgeCommit);setTimeout(workflowBridgeCommit,0);}workflowBridgeControl.addEventListener("input",workflowBridgeScheduleCommit);workflowBridgeControl.addEventListener('change',workflowBridgeScheduleCommit);const workflowBridgeStateTargets=new Set(workflowBridgeCore.querySelectorAll('dialog'));if(workflowBridgeControlled&&workflowBridgeCore.contains(workflowBridgeControlled))workflowBridgeStateTargets.add(workflowBridgeControlled);workflowBridgeStateTargets.forEach(target=>['close','cancel','toggle'].forEach(eventName=>target.addEventListener(eventName,workflowBridgeScheduleCommit)));function workflowBridgeActivate(){workflowBridgeControl.focus();const step=Number(workflowBridgeControl.step)||1;const min=workflowBridgeControl.min===''?-Infinity:Number(workflowBridgeControl.min);const max=workflowBridgeControl.max===''?Infinity:Number(workflowBridgeControl.max);let next=Math.min(max,Math.max(min,(Number(workflowBridgeControl.value)||0)+step));if(next===Number(workflowBridgeControl.value))next=Math.max(min,Number(workflowBridgeControl.value)-step);workflowBridgeControl.value=String(next);workflowBridgeControl.dispatchEvent(new Event('input',{bubbles:true}));workflowBridgeControl.dispatchEvent(new Event('change',{bubbles:true}));const result=workflowBridgeCommit();setTimeout(workflowBridgeCommit,0);return result;}function workflowBridgeReset(){workflowBridgeCore.dataset.workflowVersion='0';workflowBridgeLastEffect=workflowBridgeSerialize();}
const workflowDispatchCore=document.querySelector('#workflowCore');const workflowDispatchForm=document.querySelector('#workflowDispatchForm');const workflowDispatchSelect=document.querySelector('#workflowDispatchActive');const workflowDispatchJobs=new Map([["1",{"label":"Roadside Station","amount":12,"priority":"normal","touches":0}],["2",{"label":"Park Station","amount":21,"priority":"urgent","touches":0}]]);let workflowDispatchSerial=workflowDispatchJobs.size;function workflowDispatchDrive(job,activate=false){workflowDispatchCore.dataset.dispatchPriority=job.priority;workflowDispatchCore.style.setProperty('--dispatch-load',Math.min(.95,.16+job.amount/120));const bridge=activate?workflowBridgeActivate():{changed:false,summary:workflowBridgeSummary()};document.querySelector('#workflowDispatchSummary').textContent=job.label+' · '+job.amount+' AQI · '+bridge.summary;announce('Current tasks at the air quality station:'+job.label);}function workflowDispatchRender(activeId,activate=false){workflowDispatchSelect.replaceChildren(...[...workflowDispatchJobs].map(([id,job])=>{const option=document.createElement('option');option.value=id;option.textContent=job.label+(job.priority==='urgent'?' · Urgent':'');return option;}));workflowDispatchSelect.value=activeId;workflowDispatchDrive(workflowDispatchJobs.get(activeId),activate);}workflowDispatchForm.addEventListener('submit',event=>{event.preventDefault();const data=new FormData(workflowDispatchForm);const id=String(++workflowDispatchSerial);workflowDispatchJobs.set(id,{label:document.querySelector('#workflowDispatchKind').value,amount:Math.max(1,Number(document.querySelector('#workflowDispatchAmount').value)||1),priority:data.get('workflowPriority'),touches:0});workflowDispatchRender(id,true);});workflowDispatchSelect.addEventListener('change',()=>workflowDispatchDrive(workflowDispatchJobs.get(workflowDispatchSelect.value),true));workflowDispatchCore.addEventListener('focusin',()=>{const job=workflowDispatchJobs.get(workflowDispatchSelect.value);if(!job)return;job.touches+=1;document.querySelector('#workflowDispatchSummary').textContent=job.label+' · '+job.amount+' AQI · '+workflowBridgeSummary();});workflowDispatchRender('1',false);
workflowBridgeReset();
</script>
</body>
</html>