Drawing and Data Visualization

Garden Growth Trend Line Chart

Build a trend line chart for a garden growth scenario: real content, interactive controls, clear status feedback, and responsive layout across screen sizes.

Drawing and Data VisualizationTrend line chartHTMLCanvasJavaScript
With JavaScript enabled, you can edit, run, and save this example. The fixed source is as follows:
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  <title>Garden Growth Trend Line Chart</title>
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<body data-aesthetic="minimal" data-composition="control-deck">
  <main class="page">
    <header class="mast"><div><span class="eyebrow">minimal / Trend Line Chart / INTERMEDIATE</span><h1>Garden Growth Trend Line Chart</h1><p class="intro">Build a trend line chart for a garden growth scenario: real content, interactive controls, clear status feedback, and responsive layout across screen sizes.</p></div><span class="scenario">Garden Growth</span></header>
    <div class="composition-deck"><div class="deck-bar"><span>CONTROL DECK · 04</span><span>Trend line chart</span><span class="deck-lights" aria-hidden="true"><i></i><i></i><i></i></span></div><section class="demo" aria-label="Interactive area for the garden growth trend line chart"><div class="workflow-compare"><form id="workflowCompareControls" class="compare-controls"><fieldset><legend>Reference Channel</legend><label><input type="radio" name="workflowChannel" value="A" checked>A · Sunflower Garden</label><label><input type="radio" name="workflowChannel" value="B">B · Partial Shade Flower Bed</label></fieldset><label>Stem Height Target Weight<input id="workflowCompareWeight" type="range" min="10" max="90" value="50"><output id="workflowCompareWeightValue">50 cm</output></label><label><input id="workflowCompareFreeze" type="checkbox">Freeze current version</label><button id="workflowCompareCapture" class="action primary" type="button">Sample and save observations</button><ol id="workflowCompareShelf" aria-label="Version Sampling Record"></ol></form><section class="compare-stage"><header><span class="eyebrow">Garden Growth COMPARE</span><h2>Growth comparison dual-version comparison</h2><output id="workflowCompareLive">Version A waiting for sampling</output></header><section id="workflowCore" class="workflow-core compare-core" data-compare-channel="A" style="--compare-split:50%"><!-- 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>Garden growth 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></section></div><p id="status" class="status" role="status" aria-live="polite"></p></section></div>
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    function random(){ drawSeed = (drawSeed * 1664525 + 1013904223) >>> 0; return drawSeed / 4294967296; }
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      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?'#e05263':'#79b7c7'; context.fillStyle=context.strokeStyle+'88'; context.lineWidth=(2+random()*4)*Math.max(.6,drawingFactor);
        context.moveTo(index?x-30:0,index?y+20:height*.7); context.quadraticCurveTo(x-12,y-size,x,y); context.stroke();
      } context.globalCompositeOperation='source-over'; announce('Canvas generated ' + count + ' graphic elements'); }
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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 workflowCompareCore=document.querySelector('#workflowCore');const workflowCompareWeight=document.querySelector('#workflowCompareWeight');const workflowCompareState={channel:'A',weight:50,frozen:false,snapshots:[]};function workflowCompareFingerprint(){const controls=[...workflowCompareCore.querySelectorAll('input,select,textarea')];const outputs=[...workflowCompareCore.querySelectorAll('output,[role="status"],strong')].map(node=>node.textContent.trim()).filter(Boolean);return {controlValues:controls.map(control=>control.type==='checkbox'||control.type==='radio'?control.checked:control.value),summary:outputs.slice(0,4).join(' / '),nodes:workflowCompareCore.querySelectorAll('*').length};}function workflowCompareDrive(){workflowCompareCore.dataset.compareChannel=workflowCompareState.channel;workflowCompareCore.style.setProperty('--compare-split',workflowCompareState.weight+'%');document.querySelector('#workflowCompareWeightValue').textContent=workflowCompareState.weight+' centimeters';document.querySelector('#workflowCompareLive').textContent=workflowCompareState.channel+' Version · '+workflowCompareState.weight+' centimeters'+(workflowCompareState.frozen?' · Frozen':'');announce('Growth comparison view in progress '+workflowCompareState.channel+' Version');}function workflowCompareCapture(source){const bridge=workflowBridgeActivate();const snapshot={...workflowCompareFingerprint(),channel:workflowCompareState.channel,weight:workflowCompareState.weight,source,bridge:bridge.summary};workflowCompareState.snapshots.push(snapshot);const item=document.createElement('li');item.innerHTML='<b>'+snapshot.channel+'</b><span>'+(snapshot.summary||snapshot.bridge)+'</span><small>'+snapshot.weight+' cm · '+snapshot.bridge+'</small>';document.querySelector('#workflowCompareShelf').prepend(item);announce('sampled '+snapshot.channel+' Version and save observation · '+bridge.summary);}document.querySelectorAll('[name="workflowChannel"]').forEach(input=>input.addEventListener('change',()=>{workflowCompareState.channel=input.value;workflowCompareDrive();}));workflowCompareWeight.addEventListener('input',()=>{workflowCompareState.weight=Number(workflowCompareWeight.value);workflowCompareDrive();});document.querySelector('#workflowCompareFreeze').addEventListener('change',event=>{workflowCompareState.frozen=event.currentTarget.checked;workflowCompareDrive();});document.querySelector('#workflowCompareCapture').addEventListener('click',()=>workflowCompareCapture('Button Sampling'));workflowCompareCore.addEventListener('dblclick',()=>workflowCompareCapture('Main view double-click'));workflowCompareDrive();
workflowBridgeReset();
  </script>
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