Night Garden Interactive Particle Field
Complete an interactive particle field in a night garden scene: includes real content, actionable controls, clear status feedback, and responsive layouts across sizes.
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<title>Night Garden Interactive Particle Field</title>
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<header class="mast"><div><span class="eyebrow">paper / interactive particle field / INTERMEDIATE</span><h1>Night Garden Interactive Particle Field</h1><p class="intro">Complete an interactive particle field in a night garden scene: includes real content, actionable controls, clear status feedback, and responsive layouts across sizes.</p></div><span class="scenario">Night Garden</span></header>
<figure class="composition-gallery"><section class="demo" aria-label="Interactive area for the night garden interactive particle field"><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-particle-field --><div class="particle-field-lab"><canvas id="particleCanvas" width="960" height="480" tabindex="0" aria-label="Night Garden interactive particle field; move the pointer or use the arrow keys to attract particles" aria-describedby="particleHelp">Your browser does not support Canvas.</canvas><aside class="particle-controls panel"><span class="eyebrow">PARTICLE FIELD</span><h2>Interactive Particle Field</h2><p id="particleHelp" class="muted">Move the pointer on the canvas, or focus the canvas and use the arrow keys to move the attractor point.</p><label>Particle Count <input id="particleAmount" type="range" min="24" max="110" value="64" data-core-bridge="creative-effects-particle-field"><output id="particleAmountValue">64</output></label><label>Attraction Intensity <input id="particlePull" type="range" min="0" max="100" value="45"><output id="particlePullValue">45%</output></label><div class="row"><button id="particleReset" class="action primary" type="button">Reset particles</button><button id="particlePause" class="action" type="button" aria-pressed="false">Pause</button></div></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><figcaption class="gallery-caption"><strong>Night Garden / GALLERY 03</strong></figcaption></figure>
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<script>
'use strict';
const statusOutput = document.querySelector('#status');
const announce = message => { statusOutput.textContent = message; };
/* 11DZ_CORE_SCRIPT_START:creative-effects-particle-field */
const particleCanvas=document.querySelector('#particleCanvas');const particleContext=particleCanvas.getContext('2d');const particleAmount=document.querySelector('#particleAmount');const particlePull=document.querySelector('#particlePull');const particleReduced=matchMedia('(prefers-reduced-motion: reduce)').matches;let particlePaused=particleReduced;let particleList=[];let particleTarget={x:0,y:0,active:false};let particleFrame=0;function sizeParticleCanvas(){const rect=particleCanvas.getBoundingClientRect();const ratio=Math.min(2,devicePixelRatio||1);particleCanvas.width=Math.max(320,Math.round(rect.width*ratio));particleCanvas.height=Math.max(260,Math.round(rect.height*ratio));particleContext.setTransform(ratio,0,0,ratio,0,0);if(!particleTarget.active){particleTarget.x=rect.width/2;particleTarget.y=rect.height/2;}}function resetParticles(){cancelAnimationFrame(particleFrame);const rect=particleCanvas.getBoundingClientRect();particleList=Array.from({length:Number(particleAmount.value)},(_,index)=>({x:(index*83%997)/997*rect.width,y:(index*47%509)/509*rect.height,vx:Math.sin(index*2.17)*.45,vy:Math.cos(index*1.73)*.45,r:1.5+index%4}));document.querySelector('#particleAmountValue').textContent=particleAmount.value;drawParticleField();announce('Particle field reset, total '+particleList.length+' particle');}function drawParticleField(){const rect=particleCanvas.getBoundingClientRect();particleContext.clearRect(0,0,rect.width,rect.height);particleContext.fillStyle='#07131f';particleContext.fillRect(0,0,rect.width,rect.height);const force=Number(particlePull.value)/17000;particleList.forEach((particle,index)=>{if(!particlePaused){if(particleTarget.active){const dx=particleTarget.x-particle.x;const dy=particleTarget.y-particle.y;const distance=Math.max(30,Math.hypot(dx,dy));particle.vx+=dx/distance*force*distance;particle.vy+=dy/distance*force*distance;}particle.vx*=.992;particle.vy*=.992;particle.x+=particle.vx;particle.y+=particle.vy;if(particle.x<0||particle.x>rect.width)particle.vx*=-1;if(particle.y<0||particle.y>rect.height)particle.vy*=-1;particle.x=Math.max(0,Math.min(rect.width,particle.x));particle.y=Math.max(0,Math.min(rect.height,particle.y));}particleContext.beginPath();particleContext.fillStyle=index%3?'#67e8f9':'#ff8a65';particleContext.arc(particle.x,particle.y,particle.r,0,Math.PI*2);particleContext.fill();particleList.slice(index+1,index+7).forEach(other=>{const distance=Math.hypot(other.x-particle.x,other.y-particle.y);if(distance<72){particleContext.beginPath();particleContext.strokeStyle='rgba(103,232,249,'+(1-distance/72)*.22+')';particleContext.moveTo(particle.x,particle.y);particleContext.lineTo(other.x,other.y);particleContext.stroke();}});});if(!particlePaused)particleFrame=requestAnimationFrame(drawParticleField);}function moveParticleTarget(clientX,clientY){const rect=particleCanvas.getBoundingClientRect();particleTarget={x:clientX-rect.left,y:clientY-rect.top,active:true};}particleCanvas.addEventListener('pointermove',event=>moveParticleTarget(event.clientX,event.clientY));particleCanvas.addEventListener('pointerleave',()=>{particleTarget.active=false;});particleCanvas.addEventListener('keydown',event=>{if(!['ArrowLeft','ArrowRight','ArrowUp','ArrowDown'].includes(event.key))return;event.preventDefault();particleTarget.active=true;particleTarget.x+=event.key==='ArrowRight'?18:event.key==='ArrowLeft'?-18:0;particleTarget.y+=event.key==='ArrowDown'?18:event.key==='ArrowUp'?-18:0;particleTarget.x=Math.max(0,Math.min(particleCanvas.clientWidth,particleTarget.x));particleTarget.y=Math.max(0,Math.min(particleCanvas.clientHeight,particleTarget.y));drawParticleField();});particleAmount.addEventListener('input',resetParticles);particlePull.addEventListener('input',()=>{document.querySelector('#particlePullValue').textContent=particlePull.value+'%';announce('Particle attraction intensity '+particlePull.value+'%');});document.querySelector('#particleReset').addEventListener('click',resetParticles);document.querySelector('#particlePause').addEventListener('click',event=>{particlePaused=!particlePaused;event.currentTarget.textContent=particlePaused?'Continue':'Pause';event.currentTarget.setAttribute('aria-pressed',String(particlePaused));cancelAnimationFrame(particleFrame);drawParticleField();announce(particlePaused?'Particle field paused':'Particle field keeps moving');});addEventListener('resize',()=>{sizeParticleCanvas();resetParticles();},{passive:true});sizeParticleCanvas();resetParticles();
/* 11DZ_CORE_SCRIPT_END */
const workflowBridgeSpec={"name":"creative-effects-particle-field","selector":"[data-core-bridge=\"creative-effects-particle-field\"]","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();}
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workflowBridgeReset();
</script>
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