Drawing and Data Visualization
Civic monitoring matrix heatmap

Complete the matrix heatmap in a public monitoring console scenario: includes real content, actionable controls, clear status feedback, and responsive layouts.
Drawing and Data VisualizationMatrix heatmapHTMLCanvasJavaScript
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    <header class="mast"><div><span class="eyebrow">playful / matrix heatmap / INTERMEDIATE</span><h1>Civic monitoring matrix heatmap</h1><p class="intro">Complete the matrix heatmap in a public monitoring console scenario: includes real content, actionable controls, clear status feedback, and responsive layouts.</p></div><span class="scenario">Public monitoring console</span></header>
    <div class="composition-studio"><div class="studio-ruler" aria-hidden="true"></div><section class="demo" aria-label="Public Monitoring Dashboard Matrix Heatmap Interactive Area"><div id="workflowSpatial" class="workflow-spatial" style="--spatial-width:64%;--spatial-zoom:1"><header><div><span class="eyebrow">Public Monitoring Platform SPATIAL CANVAS</span><h2>Public Monitoring Control Panel</h2></div><label>Observation threshold proportion<input id="workflowSpatialWidth" type="range" min="38" max="82" value="64"><output id="workflowSpatialWidthValue">64%</output></label><label>Content Scaling<input id="workflowSpatialZoom" type="range" min="80" max="120" value="100"><output id="workflowSpatialZoomValue">100%</output></label></header><div class="spatial-grid"><section id="workflowCore" class="workflow-core spatial-core"><!-- 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>Public Monitoring Station 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><input id="workflowSpatialHandle" class="spatial-handle" type="button" value="↔" aria-label="Drag to adjust the main case preview width"><aside><strong>Public Monitoring Dashboard Current View</strong><p>The comparison view and summary view of the public monitoring dashboard reflow with the canvas size.</p><output id="workflowSpatialStatus">Width 64%, zoom 100%</output><input id="workflowSpatialApply" class="action primary" type="button" value="Save view"></aside></div></div><p id="status" class="status" role="status" aria-live="polite"></p></section></div>
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    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 = 2241850352;
    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 = '#18332f'; 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?'#d45f3e':'#8fc4ad'; 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 workflowSpatial=document.querySelector('#workflowSpatial');const workflowSpatialCore=document.querySelector('#workflowCore');const workflowSpatialWidth=document.querySelector('#workflowSpatialWidth');const workflowSpatialZoom=document.querySelector('#workflowSpatialZoom');const workflowSpatialHandle=document.querySelector('#workflowSpatialHandle');const workflowSpatialState={width:64,zoom:1,dragging:false};function workflowSpatialDrive(){workflowSpatial.style.setProperty('--spatial-width',workflowSpatialState.width+'%');workflowSpatial.style.setProperty('--spatial-zoom',String(workflowSpatialState.zoom));workflowSpatialWidth.value=String(workflowSpatialState.width);workflowSpatialZoom.value=String(Math.round(workflowSpatialState.zoom*100));document.querySelector('#workflowSpatialWidthValue').textContent=workflowSpatialState.width+'%';document.querySelector('#workflowSpatialZoomValue').textContent=Math.round(workflowSpatialState.zoom*100)+'%';document.querySelector('#workflowSpatialStatus').textContent='width '+workflowSpatialState.width+'%, zoom '+Math.round(workflowSpatialState.zoom*100)+'%';announce('The public monitoring dashboard canvas has been rearranged');}workflowSpatialWidth.addEventListener('input',()=>{workflowSpatialState.width=Number(workflowSpatialWidth.value);workflowSpatialDrive();});workflowSpatialZoom.addEventListener('input',()=>{workflowSpatialState.zoom=Number(workflowSpatialZoom.value)/100;workflowSpatialDrive();});workflowSpatialHandle.addEventListener('pointerdown',event=>{workflowSpatialState.dragging=true;workflowSpatialHandle.setPointerCapture(event.pointerId);});workflowSpatialHandle.addEventListener('pointermove',event=>{if(!workflowSpatialState.dragging)return;const rect=workflowSpatial.getBoundingClientRect();workflowSpatialState.width=Math.max(38,Math.min(82,Math.round((event.clientX-rect.left)/rect.width*100)));workflowSpatialDrive();});workflowSpatialHandle.addEventListener('pointerup',event=>{workflowSpatialState.dragging=false;workflowSpatialHandle.releasePointerCapture(event.pointerId);});workflowSpatialHandle.addEventListener('wheel',event=>{event.preventDefault();workflowSpatialState.zoom=Math.max(.8,Math.min(1.2,workflowSpatialState.zoom+(event.deltaY<0?.05:-.05)));workflowSpatialDrive();},{passive:false});workflowSpatialHandle.addEventListener('keydown',event=>{if(!['ArrowLeft','ArrowRight'].includes(event.key))return;event.preventDefault();workflowSpatialState.width=Math.max(38,Math.min(82,workflowSpatialState.width+(event.key==='ArrowRight'?2:-2)));workflowSpatialDrive();});document.querySelector('#workflowSpatialApply').addEventListener('click',()=>{const bridge=workflowBridgeActivate();document.querySelector('#workflowSpatialStatus').textContent='Saved View · Width '+workflowSpatialState.width+'%, zoom '+Math.round(workflowSpatialState.zoom*100)+'% · '+bridge.summary;announce(document.querySelector('#workflowSpatialStatus').textContent);});workflowSpatialDrive();
workflowBridgeReset();
  </script>
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