Night garden kaleidoscope pattern
Complete a kaleidoscope pattern in a night garden scenario: include real content, interactive controls, clear state feedback, and responsive layouts.
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<header class="mast"><div><span class="eyebrow">terminal / kaleidoscope pattern / BEGINNER</span><h1>Night garden kaleidoscope pattern</h1><p class="intro">Complete a kaleidoscope pattern in a night garden scenario: include real content, interactive controls, clear state feedback, and responsive layouts.</p></div><span class="scenario">Night Garden</span></header>
<div class="composition-split"><aside class="split-note"><b>CASE 02</b><span>Master the semantic structure, responsive layout, keyboard interaction, and state synchronization of kaleidoscope patterns.</span></aside><section class="demo" aria-label="Night Garden Kaleidoscope Pattern Interactive Area"><div class="workflow-session"><header class="session-command"><div><span class="eyebrow">Night Garden SESSION</span><h2>Garden Observation Timing Station</h2></div><output id="workflowSessionClock">00:45</output><label>Round Duration<input id="workflowSessionLength" type="range" min="15" max="90" step="15" value="45"><span>sec</span></label><button id="workflowSessionToggle" class="action primary" type="button">Start monitoring</button></header><div id="workflowSessionProgress" role="progressbar" aria-label="Garden Observation Progress" aria-valuemin="0" aria-valuemax="100" aria-valuenow="0"><i></i></div><section id="workflowCore" class="workflow-core session-stage" data-session-phase="ready" tabindex="-1"><!-- 11DZ_CORE_START:creative-effects-kaleidoscope --><div class="kaleidoscope-lab"><canvas id="kaleidoscopeCanvas" width="720" height="720" tabindex="0" aria-label="Interactive kaleidoscope for the night garden; move the pointer or use the left and right arrow keys to rotate the pattern" aria-describedby="kaleidoscopeHelp">Your browser does not support Canvas.</canvas><aside class="kaleidoscope-controls panel"><span class="eyebrow">KALEIDOSCOPE</span><h2>Kaleidoscope Pattern</h2><p id="kaleidoscopeHelp" class="muted">Multiple mirrored sectors share the same set of shapes, forming strict symmetry. Move the pointer to change the rotation angle.</p><label>Mirror sector <input id="kaleidoscopeSegments" type="range" min="4" max="16" step="2" value="10" data-core-bridge="creative-effects-kaleidoscope"><output id="kaleidoscopeSegmentsValue">10</output></label><label>Graphic Density <input id="kaleidoscopeDensity" type="range" min="3" max="12" value="7"><output id="kaleidoscopeDensityValue">7</output></label><button id="kaleidoscopeSpin" class="action" type="button" aria-pressed="false">Auto rotate</button></aside></div><!-- 11DZ_CORE_END --></section><footer class="session-log"><strong id="workflowSessionScore">0 interaction checkpoints</strong><ol id="workflowSessionLaps" aria-label="Round Log"></ol></footer></div><p id="status" class="status" role="status" aria-live="polite"></p></section></div>
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<script>
'use strict';
const statusOutput = document.querySelector('#status');
const announce = message => { statusOutput.textContent = message; };
/* 11DZ_CORE_SCRIPT_START:creative-effects-kaleidoscope */
const kaleidoscopeCanvas=document.querySelector('#kaleidoscopeCanvas');const kaleidoscopeContext=kaleidoscopeCanvas.getContext('2d');const kaleidoscopeSegments=document.querySelector('#kaleidoscopeSegments');const kaleidoscopeDensity=document.querySelector('#kaleidoscopeDensity');const kaleidoscopeReduced=matchMedia('(prefers-reduced-motion: reduce)').matches;let kaleidoscopeAngle=0;let kaleidoscopeSpinning=false;let kaleidoscopeFrame=0;function sizeKaleidoscope(){const rect=kaleidoscopeCanvas.getBoundingClientRect();const side=Math.max(300,Math.min(rect.width,rect.height||rect.width));const ratio=Math.min(2,devicePixelRatio||1);kaleidoscopeCanvas.width=Math.round(side*ratio);kaleidoscopeCanvas.height=Math.round(side*ratio);kaleidoscopeContext.setTransform(ratio,0,0,ratio,0,0);drawKaleidoscope();}function drawKaleidoscope(){const side=kaleidoscopeCanvas.width/Math.min(2,devicePixelRatio||1);const center=side/2;const segments=Number(kaleidoscopeSegments.value);const density=Number(kaleidoscopeDensity.value);kaleidoscopeContext.fillStyle='#100b24';kaleidoscopeContext.fillRect(0,0,side,side);for(let segment=0;segment<segments;segment+=1){for(let mirror=0;mirror<2;mirror+=1){kaleidoscopeContext.save();kaleidoscopeContext.translate(center,center);kaleidoscopeContext.rotate(kaleidoscopeAngle+segment*Math.PI*2/segments);kaleidoscopeContext.scale(1,mirror?-1:1);for(let index=0;index<density;index+=1){const radius=36+index*(center-54)/density;const size=8+(index*7)%24;kaleidoscopeContext.beginPath();kaleidoscopeContext.fillStyle=['#22d3ee','#f472b6','#fde047','#a78bfa'][index%4]+'bb';kaleidoscopeContext.arc(radius,Math.sin(index*1.7)*radius*.18,size,0,Math.PI*2);kaleidoscopeContext.fill();kaleidoscopeContext.rotate(.045);}kaleidoscopeContext.restore();}}if(kaleidoscopeSpinning&&!kaleidoscopeReduced){kaleidoscopeAngle+=.004;cancelAnimationFrame(kaleidoscopeFrame);kaleidoscopeFrame=requestAnimationFrame(drawKaleidoscope);}}kaleidoscopeCanvas.addEventListener('pointermove',event=>{const rect=kaleidoscopeCanvas.getBoundingClientRect();kaleidoscopeAngle=(event.clientX-rect.left)/rect.width*Math.PI*2;drawKaleidoscope();});kaleidoscopeCanvas.addEventListener('keydown',event=>{if(!['ArrowLeft','ArrowRight'].includes(event.key))return;event.preventDefault();kaleidoscopeAngle+=event.key==='ArrowRight'?.12:-.12;drawKaleidoscope();announce('The kaleidoscope rotation angle has been adjusted');});[kaleidoscopeSegments,kaleidoscopeDensity].forEach(input=>input.addEventListener('input',()=>{document.querySelector('#kaleidoscopeSegmentsValue').textContent=kaleidoscopeSegments.value;document.querySelector('#kaleidoscopeDensityValue').textContent=kaleidoscopeDensity.value;drawKaleidoscope();announce('Kaleidoscope '+kaleidoscopeSegments.value+' sector, density '+kaleidoscopeDensity.value);}));document.querySelector('#kaleidoscopeSpin').addEventListener('click',event=>{kaleidoscopeSpinning=!kaleidoscopeSpinning;event.currentTarget.textContent=kaleidoscopeSpinning?'Stop rotating':'Auto rotate';event.currentTarget.setAttribute('aria-pressed',String(kaleidoscopeSpinning));cancelAnimationFrame(kaleidoscopeFrame);drawKaleidoscope();announce(kaleidoscopeSpinning?'The kaleidoscope starts rotating automatically':'The kaleidoscope has stopped rotating');});addEventListener('resize',sizeKaleidoscope,{passive:true});sizeKaleidoscope();
/* 11DZ_CORE_SCRIPT_END */
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workflowBridgeReset();
</script>
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