Efeito de trilha do cursor no fundo do mar
Crie um efeito de rastro do cursor em um cenário de mar profundo: inclui conteúdo real, controles acionáveis, feedback claro de estado e layout adaptável a diferentes tamanhos.
É possível editar, executar e salvar este exemplo após ativar JavaScript. O código-fonte fixo é o seguinte:
<!doctype html>
<html lang="pt-BR" dir="ltr">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Efeito de trilha do cursor no fundo do mar</title>
<style>
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.composition-index{position:relative;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:18px}.index-mark{display:grid;align-content:space-between;width:76px;padding:16px 10px;border:1px solid var(--line);color:var(--accent);background:color-mix(in srgb,var(--paper) 82%,transparent);text-align:center}.index-mark strong{font:900 34px/1 ui-monospace,monospace}.index-mark span{writing-mode:vertical-rl;font:800 10px/1.2 ui-monospace,monospace;letter-spacing:.18em}.composition-index .demo{grid-column:1;grid-row:1}.composition-index::before{content:"";position:absolute;left:-12px;top:38px;width:5px;height:45%;background:linear-gradient(var(--accent),var(--secondary))}@media(max-width:700px){.composition-index{grid-template-columns:1fr}.index-mark{grid-row:1;width:auto;grid-template-columns:auto 1fr}.index-mark span{writing-mode:horizontal-tb}.composition-index .demo{grid-row:2}}
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</style>
</head>
<body data-aesthetic="dashboard" data-composition="field-index">
<main class="page">
<header class="mast"><div><span class="eyebrow">dashboard / efeito de traço do ponteiro / INTERMEDIATE</span><h1>Efeito de trilha do cursor no fundo do mar</h1><p class="intro">Crie um efeito de rastro do cursor em um cenário de mar profundo: inclui conteúdo real, controles acionáveis, feedback claro de estado e layout adaptável a diferentes tamanhos.</p></div><span class="scenario">Mar profundo</span></header>
<div class="composition-index"><section class="demo" aria-label="Área interativa do efeito de trilha luminosa do ponteiro em mar profundo"><div class="workflow-dispatch"><aside class="dispatch-console"><span class="eyebrow">Profundezas do mar DISPATCH</span><h2>Central de agendamento de missão subaquática</h2><form id="workflowDispatchForm"><label>Tipo de tarefa<select id="workflowDispatchKind"><option>Varredura de sonar</option><option>Coleta em fonte termal</option><option>Bóia de retorno</option></select></label><label>Profundidade de mergulho<input id="workflowDispatchAmount" type="number" min="1" max="9999" value="45"><span>metro</span></label><fieldset><legend>Prioridade de processamento</legend><label><input type="radio" name="workflowPriority" value="normal" checked>Padrão</label><label><input type="radio" name="workflowPriority" value="urgent">Urgente</label></fieldset><button class="action primary" type="submit">Executar mergulho subaquático</button></form><label>Tarefa atual<select id="workflowDispatchActive" aria-label="Alternar tarefa atual"><option value="1">Varredura de sonar</option><option value="2">Coleta em fonte termal</option></select></label><output id="workflowDispatchSummary">Aguardando despacho</output></aside><section id="workflowCore" class="workflow-core dispatch-workbench" data-dispatch-priority="normal"><!-- 11DZ_CORE_START:creative-effects-cursor-trail --><div class="cursor-trail-lab" data-trail-layout="deep-current"><section class="trail-stage"><canvas id="trailCanvas" width="960" height="460" tabindex="0" aria-label="Tela de trilha luminosa do ponteiro no mar profundo; mova o ponteiro ou use as setas do teclado para desenhar trilhas luminosas" aria-describedby="trailHelp">Este navegador não suporta Canvas.</canvas><div><span>Mar profundo</span><h2>A corrente de fundo leva cada rastro de movimento para as profundezas</h2><p id="trailHelp">Mova o mouse, toque a tela ou, após focar, use as setas do teclado para desenhar.</p></div></section><aside class="trail-controls panel"><span class="eyebrow">CURSOR TRAIL</span><h2>Rastro das correntes profundas</h2><label>Comprimento do rastro de luz <input id="trailLength" type="range" min="12" max="90" value="54" data-core-bridge="creative-effects-cursor-trail"><output id="trailLengthValue">54</output></label><label>Tamanho do ponto de luz <input id="trailSize" type="range" min="3" max="18" value="9"><output id="trailSizeValue">9px</output></label><button id="trailClear" class="action" type="button">Limpar trilha de luz</button></aside></div><!-- 11DZ_CORE_END --></section></div><p id="status" class="status" role="status" aria-live="polite"></p></section><aside class="index-mark" aria-hidden="true"><strong>05</strong><span>profundezas do mar 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-cursor-trail */
const trailCanvas=document.querySelector('#trailCanvas');const trailContext=trailCanvas.getContext('2d');const trailLength=document.querySelector('#trailLength');const trailSize=document.querySelector('#trailSize');const trailReduced=matchMedia('(prefers-reduced-motion: reduce)').matches;const trailHueOffset=0;let trailPoints=[];let trailCursor={x:0,y:0};let trailFrame=0;function sizeTrailCanvas(){const rect=trailCanvas.getBoundingClientRect();const ratio=Math.min(2,devicePixelRatio||1);trailCanvas.width=Math.max(320,Math.round(rect.width*ratio));trailCanvas.height=Math.max(280,Math.round(rect.height*ratio));trailContext.setTransform(ratio,0,0,ratio,0,0);trailCursor={x:rect.width/2,y:rect.height/2};}function addTrailPoint(x,y){trailCursor={x,y};trailPoints.push({x,y,life:1,hue:(trailHueOffset+trailPoints.length*17)%360});while(trailPoints.length>Number(trailLength.value))trailPoints.shift();cancelAnimationFrame(trailFrame);drawTrail();}function drawTrail(){const rect=trailCanvas.getBoundingClientRect();trailContext.clearRect(0,0,rect.width,rect.height);trailPoints.forEach((point,index)=>{if(!trailReduced)point.life-=.018;const ratio=(index+1)/trailPoints.length;trailContext.beginPath();trailContext.fillStyle='hsla('+point.hue+',90%,68%,'+Math.max(0,point.life*ratio)+')';trailContext.shadowBlur=18;trailContext.shadowColor='hsl('+point.hue+' 90% 68%)';trailContext.arc(point.x,point.y,Number(trailSize.value)*ratio,0,Math.PI*2);trailContext.fill();});trailContext.shadowBlur=0;trailPoints=trailPoints.filter(point=>point.life>0);if(trailPoints.length&&!trailReduced)trailFrame=requestAnimationFrame(drawTrail);}function pointerTrail(event){const rect=trailCanvas.getBoundingClientRect();addTrailPoint(event.clientX-rect.left,event.clientY-rect.top);}trailCanvas.addEventListener('pointermove',pointerTrail);trailCanvas.addEventListener('pointerdown',pointerTrail);trailCanvas.addEventListener('keydown',event=>{if(!['ArrowLeft','ArrowRight','ArrowUp','ArrowDown'].includes(event.key))return;event.preventDefault();const rect=trailCanvas.getBoundingClientRect();trailCursor.x=Math.max(0,Math.min(rect.width,trailCursor.x+(event.key==='ArrowRight'?18:event.key==='ArrowLeft'?-18:0)));trailCursor.y=Math.max(0,Math.min(rect.height,trailCursor.y+(event.key==='ArrowDown'?18:event.key==='ArrowUp'?-18:0)));addTrailPoint(trailCursor.x,trailCursor.y);});trailLength.addEventListener('input',()=>{document.querySelector('#trailLengthValue').textContent=trailLength.value;announce('Comprimento do rastro de luz '+trailLength.value);});trailSize.addEventListener('input',()=>{document.querySelector('#trailSizeValue').textContent=trailSize.value+'px';announce('Tamanho do ponto de luz '+trailSize.value+' pixel');});document.querySelector('#trailClear').addEventListener('click',()=>{trailPoints=[];cancelAnimationFrame(trailFrame);drawTrail();announce('Traço do ponteiro limpo');});addEventListener('resize',sizeTrailCanvas,{passive:true});sizeTrailCanvas();
/* 11DZ_CORE_SCRIPT_END */
const workflowBridgeSpec={"name":"creative-effects-cursor-trail","selector":"[data-core-bridge=\"creative-effects-cursor-trail\"]","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+' · versão principal '+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 workflowDispatchCore=document.querySelector('#workflowCore');const workflowDispatchForm=document.querySelector('#workflowDispatchForm');const workflowDispatchSelect=document.querySelector('#workflowDispatchActive');const workflowDispatchJobs=new Map([["1",{"label":"Varredura de sonar","amount":12,"priority":"normal","touches":0}],["2",{"label":"Coleta em fonte termal","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+' metro · '+bridge.summary;announce('Missão de mergulho: tarefa atual:'+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'?' · Urgente':'');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+' metro · '+workflowBridgeSummary();});workflowDispatchRender('1',false);
workflowBridgeReset();
</script>
</body>
</html>