Deep-Sea Interactive Particle Field
Complete an interactive particle field in a deep-sea scene: includes real content, actionable controls, clear status feedback, and responsive layouts.
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<title>Deep-Sea Interactive Particle Field</title>
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<body data-aesthetic="editorial" data-composition="split-note">
<main class="page">
<header class="mast"><div><span class="eyebrow">editorial / Interactive Particle Field / INTERMEDIATE</span><h1>Deep-Sea Interactive Particle Field</h1><p class="intro">Complete an interactive particle field in a deep-sea scene: includes real content, actionable controls, clear status feedback, and responsive layouts.</p></div><span class="scenario">Deep Sea</span></header>
<div class="composition-split"><aside class="split-note"><b>CASE 02</b><span>Master the semantic structure, responsive composition, keyboard interaction, and state synchronization of interactive particle fields.</span></aside><section class="demo" aria-label="Deep Sea Interactive Particle Field Interaction Area"><div class="workflow-dispatch"><aside class="dispatch-console"><span class="eyebrow">Deep Sea DISPATCH</span><h2>Submarine mission control</h2><form id="workflowDispatchForm"><label>Task Type<select id="workflowDispatchKind"><option>Sonar Scan</option><option>Hot Spring Sampling</option><option>Return Beacon</option></select></label><label>Subsea Depth<input id="workflowDispatchAmount" type="number" min="1" max="9999" value="18"><span>m</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">Dive in</button></form><label>Current task<select id="workflowDispatchActive" aria-label="Switch current task"><option value="1">Sonar Scan</option><option value="2">Hot Spring Sampling</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:creative-effects-particle-field --><div class="particle-field-lab"><canvas id="particleCanvas" width="960" height="480" tabindex="0" aria-label="Deep-Sea 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></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-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 */
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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":"Sonar Scan","amount":12,"priority":"normal","touches":0}],["2",{"label":"Hot Spring Sampling","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+' m · '+bridge.summary;announce('Dive mission current task:'+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+' m · '+workflowBridgeSummary();});workflowDispatchRender('1',false);
workflowBridgeReset();
</script>
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