Air quality trend line chart
Complete the trend line chart for the air quality scenario: include real content, interactive controls, clear status feedback, and responsive layouts across sizes.
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<header class="mast"><div><span class="eyebrow">editorial / trend line chart / INTERMEDIATE</span><h1>Air quality trend line chart</h1><p class="intro">Complete the trend line chart for the air quality scenario: include real content, interactive controls, clear status feedback, and responsive layouts across sizes.</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 arrangement, keyboard interaction, and state synchronization of trend line charts.</span></aside><section class="demo" aria-label="Air Quality Trend Line Chart 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="21"><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-line-chart --><div class="drawing-pattern drawing-pattern-1"><div class="canvas-shell"><canvas id="artboard" width="900" height="440" aria-label="Trend Line Chart Canvas" aria-describedby="canvasDescription"></canvas><div class="canvas-tools panel"><span class="eyebrow">CANVAS MODE 2</span><h2>Trend line chart</h2><label>Complexity <input id="canvasAmount" type="range" min="4" max="28" value="13"></label><button id="redrawCanvas" class="action primary" type="button">Redraw</button><p id="canvasDescription" class="muted">On a dark canvas, trend line charts are drawn with two high-contrast colors, and a complexity slider determines the number of shapes; the entire image is generated locally in the browser.</p></div></div><section class="drawing-controller line-chart-controller"><header><span class="eyebrow">TREND ANNOTATION</span><h3>Air quality trend threshold</h3></header><label><input id="lineSmooth" type="checkbox" checked data-core-bridge="drawing-data-viz-line-chart">Use smooth trends</label><label>Attention threshold<input id="lineThreshold" type="number" min="10" max="100" value="64"></label><button id="lineAddMarker" class="action" type="button">Mark the current turning point</button><ol id="lineMarkers"><li>Starting observation point</li></ol><output id="lineModelSummary">Smooth · Threshold 64</output></section></div><!-- 11DZ_CORE_END --></section></div><p id="status" class="status" role="status" aria-live="polite"></p></section></div>
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'use strict';
const statusOutput = document.querySelector('#status');
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function random(){ drawSeed = (drawSeed * 1664525 + 1013904223) >>> 0; return drawSeed / 4294967296; }
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const lineSmooth=document.querySelector('#lineSmooth');const lineThreshold=document.querySelector('#lineThreshold');const lineMarkerList=document.querySelector('#lineMarkers');const lineModel={smooth:true,threshold:64,markers:new Map([['origin',0]])};function updateLineModel(){lineModel.smooth=lineSmooth.checked;lineModel.threshold=Math.max(10,Number(lineThreshold.value)||10);canvas.dataset.drawingFactor=String(lineModel.smooth?.9:1.18);canvas.dataset.drawingShift=String(lineModel.threshold%17);canvas.dataset.drawingBlend=lineModel.smooth?'screen':'source-over';document.querySelector('#lineModelSummary').textContent=(lineModel.smooth?'Smooth':'line chart')+' · Threshold '+lineModel.threshold;drawCanvas();}lineSmooth.addEventListener('change',updateLineModel);lineThreshold.addEventListener('input',updateLineModel);document.querySelector('#lineAddMarker').addEventListener('click',()=>{const id='turn-'+lineModel.markers.size;lineModel.markers.set(id,lineModel.threshold);const item=document.createElement('li');item.textContent='Turning Point '+lineModel.markers.size+' · '+lineModel.threshold;lineMarkerList.append(item);amount.value=String(Math.min(Number(amount.max),Number(amount.value)+1));updateLineModel();announce('Trend turning point marked');});updateLineModel();
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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();
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