Creative Visual Effects

Interactive particle field in paper space

Complete the interactive particle field in a paper-space setting: includes realistic content, interactive controls, clear status feedback, and responsive layouts.

Creative Visual EffectsInteractive Particle FieldHTMLCanvasJavaScript
With JavaScript enabled, you can edit, run, and save this example. The fixed source is as follows:
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  <title>Interactive particle field in paper space</title>
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</head>
<body data-aesthetic="dashboard" data-composition="field-index">
  <main class="page">
    <header class="mast"><div><span class="eyebrow">dashboard / interactive particle field / ADVANCED</span><h1>Interactive particle field in paper space</h1><p class="intro">Complete the interactive particle field in a paper-space setting: includes realistic content, interactive controls, clear status feedback, and responsive layouts.</p></div><span class="scenario">Paper Space</span></header>
    <div class="composition-index"><section class="demo" aria-label="Interactive particle field for paper-space interactions"><div class="workflow-guide"><nav class="guide-rail" aria-label="Paper Craft Step Guide"><span class="eyebrow">Paper Space GUIDE</span><ol><li data-workflow-guide-step="0" aria-current="step"><b>1</b><span>Folded structure</span></li><li data-workflow-guide-step="1"><b>2</b><span>Hollow Structure</span></li><li data-workflow-guide-step="2"><b>3</b><span>Color separation structure</span></li></ol><div class="guide-actions"><button id="workflowGuideBack" class="action" type="button" disabled>Previous</button><button id="workflowGuideNext" class="action primary" type="button">Complete this step</button></div><div id="workflowGuideProgress" role="progressbar" aria-label="Paper craft step completion" aria-valuemin="0" aria-valuemax="100" aria-valuenow="0"><i></i></div></nav><section id="workflowCore" class="workflow-core guide-core" data-guide-step="0" aria-describedby="workflowGuideInstruction"><p id="workflowGuideInstruction">Please complete the operations related to “folded structure” in the main example.</p><!-- 11DZ_CORE_START:creative-effects-particle-field --><div class="particle-field-lab"><canvas id="particleCanvas" width="960" height="480" tabindex="0" aria-label="Interactive particle field in a paper-space setting; 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><aside class="guide-evidence"><details id="workflowGuideDetails"><summary>View acceptance requirements</summary><ul><li>Collapsed structures need a visible state change at once</li><li>The hollow structure needs one visible state change</li><li>The color-separated structure needs one visible state change</li></ul></details><form id="workflowGuideEvidenceForm"><label>This step evidence<textarea id="workflowGuideEvidence" rows="3" placeholder="Record the observed state"></textarea></label><input class="action" type="submit" value="Save evidence"></form><output id="workflowGuideSummary">0 / 3 Steps Complete</output></aside></div><p id="status" class="status" role="status" aria-live="polite"></p></section><aside class="index-mark" aria-hidden="true"><strong>05</strong><span>Paper Space FIELD INDEX</span></aside></div>
  </main>
  <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();}
const workflowGuideCore=document.querySelector('#workflowCore');const workflowGuideStages=["Folded structure","Hollow Structure","Color separation structure"];const workflowGuideState={step:0,completed:new Set(),evidence:new Map(),consumedVersion:0};function workflowGuideDrive(){const step=workflowGuideState.step;workflowGuideCore.dataset.guideStep=String(step);document.querySelector('#workflowGuideInstruction').textContent='Please complete the main example ‘'+workflowGuideStages[step]+'Related actions.”';document.querySelectorAll('[data-workflow-guide-step]').forEach((item,index)=>{item.classList.toggle('is-complete',workflowGuideState.completed.has(index));if(index===step)item.setAttribute('aria-current','step');else item.removeAttribute('aria-current');});document.querySelector('#workflowGuideBack').disabled=step===0;document.querySelector('#workflowGuideNext').textContent=step===workflowGuideStages.length-1?'Record Paper Sample':'Complete this step';const percent=Math.round(workflowGuideState.completed.size/workflowGuideStages.length*100);const progress=document.querySelector('#workflowGuideProgress');progress.setAttribute('aria-valuenow',String(percent));progress.querySelector('i').style.width=percent+'%';document.querySelector('#workflowGuideSummary').textContent=workflowGuideState.completed.size+' / '+workflowGuideStages.length+' Step complete · '+workflowBridgeSummary();announce('Paper Craft Step Current Step:'+workflowGuideStages[step]);}function workflowGuideAdvance(direction){if(direction>0){const bridge=workflowBridgeActivate();const version=Number(workflowGuideCore.dataset.workflowVersion||0);if(version<=workflowGuideState.consumedVersion){announce('Please complete the visible state change in the main example first');return;}workflowGuideState.consumedVersion=version;workflowGuideState.completed.add(workflowGuideState.step);announce('Main case changes recorded · '+bridge.summary);}workflowGuideState.step=Math.max(0,Math.min(workflowGuideStages.length-1,workflowGuideState.step+direction));workflowGuideDrive();}document.querySelector('#workflowGuideBack').addEventListener('click',()=>workflowGuideAdvance(-1));document.querySelector('#workflowGuideNext').addEventListener('click',()=>workflowGuideAdvance(1));document.querySelector('#workflowGuideEvidenceForm').addEventListener('submit',event=>{event.preventDefault();const version=Number(workflowGuideCore.dataset.workflowVersion||0);if(version<=workflowGuideState.consumedVersion){announce('Evidence not saved: the main example has no new changes yet');return;}const text=document.querySelector('#workflowGuideEvidence').value.trim();workflowGuideState.evidence.set(workflowGuideState.step,text||'Visible status check completed');workflowGuideState.completed.add(workflowGuideState.step);workflowGuideState.consumedVersion=version;workflowGuideDrive();announce('Evidence for this step has been saved · '+workflowBridgeSummary());});document.querySelector('#workflowGuideDetails').addEventListener('toggle',event=>announce(event.currentTarget.open?'Acceptance requirements expanded':'Acceptance requirements collapsed'));workflowGuideDrive();
workflowBridgeReset();
  </script>
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