Cloud Harbor Starfield Traverse Effect
Complete the starfield traversal effect in the Cloud Lake Harbor scenario: includes real content, interactive controls, clear status feedback, and responsive layouts.
With JavaScript enabled, you can edit, run, and save this example. The fixed source is as follows:
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<title>Cloud Harbor Starfield Traverse Effect</title>
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<header class="mast"><div><span class="eyebrow">dark-neon / Starry Sky Traversal Effects / BEGINNER</span><h1>Cloud Harbor Starfield Traverse Effect</h1><p class="intro">Complete the starfield traversal effect in the Cloud Lake Harbor scenario: includes real content, interactive controls, clear status feedback, and responsive layouts.</p></div><span class="scenario">Cloud Lake Harbor</span></header>
<div class="composition-studio"><div class="studio-ruler" aria-hidden="true"></div><section class="demo" aria-label="Cloud Lake Port Starry Transit Effect Interactive Area"><div id="workflowSpatial" class="workflow-spatial" style="--spatial-width:64%;--spatial-zoom:1"><header><div><span class="eyebrow">Cloud Lake Harbor SPATIAL CANVAS</span><h2>Cloud Lake Harbor Control Desk</h2></div><label>Visual intensity share<input id="workflowSpatialWidth" type="range" min="38" max="82" value="64"><output id="workflowSpatialWidthValue">64%</output></label><label>Content Scaling<input id="workflowSpatialZoom" type="range" min="80" max="120" value="100"><output id="workflowSpatialZoomValue">100%</output></label></header><div class="spatial-grid"><section id="workflowCore" class="workflow-core spatial-core"><!-- 11DZ_CORE_START:creative-effects-starfield --><div class="starfield-lab"><canvas id="starCanvas" width="960" height="480" aria-label="Cloud Lake Harbor Starry Sky Shuttle Animation" aria-describedby="starHelp">Your browser does not support Canvas.</canvas><aside class="star-controls panel"><span class="eyebrow">STARFIELD</span><h2>Starfield traversal effect</h2><p id="starHelp" class="muted">The stars move outward from the center of the screen, with size and brightness conveying depth and distance.</p><label>shuttle speed <input id="starSpeed" type="range" min="1" max="12" value="5" data-core-bridge="creative-effects-starfield"><output id="starSpeedValue">5</output></label><label>Star Count <input id="starAmount" type="range" min="40" max="180" value="110"><output id="starAmountValue">110</output></label><div class="row"><button id="starReset" class="action primary" type="button">Reset course</button><button id="starPause" class="action" type="button" aria-pressed="false">Pause</button></div></aside></div><!-- 11DZ_CORE_END --></section><input id="workflowSpatialHandle" class="spatial-handle" type="button" value="↔" aria-label="Drag to adjust the main case preview width"><aside><strong>Cloud Lake Harbor base layers</strong><p>The dynamic hierarchy of Cloud Lake Harbor and the display hierarchy of Cloud Lake Harbor will be rearranged according to the canvas size.</p><output id="workflowSpatialStatus">Width 64%, zoom 100%</output><input id="workflowSpatialApply" class="action primary" type="button" value="Application Effect"></aside></div></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-starfield */
const starCanvas=document.querySelector('#starCanvas');const starContext=starCanvas.getContext('2d');const starSpeed=document.querySelector('#starSpeed');const starAmount=document.querySelector('#starAmount');const starReduced=matchMedia('(prefers-reduced-motion: reduce)').matches;let stars=[];let starPaused=starReduced;let starFrame=0;function sizeStarCanvas(){const rect=starCanvas.getBoundingClientRect();const ratio=Math.min(2,devicePixelRatio||1);starCanvas.width=Math.max(320,Math.round(rect.width*ratio));starCanvas.height=Math.max(260,Math.round(rect.height*ratio));starContext.setTransform(ratio,0,0,ratio,0,0);}function createStars(){cancelAnimationFrame(starFrame);const rect=starCanvas.getBoundingClientRect();stars=Array.from({length:Number(starAmount.value)},(_,index)=>({x:((index*73)%997)/997*rect.width-rect.width/2,y:((index*151)%991)/991*rect.height-rect.height/2,z:40+(index*61)%900,pz:900}));document.querySelector('#starAmountValue').textContent=starAmount.value;announce('Starfield generated '+stars.length+' stars');}function drawStars(){const rect=starCanvas.getBoundingClientRect();const centerX=rect.width/2;const centerY=rect.height/2;starContext.fillStyle='#02040a';starContext.fillRect(0,0,rect.width,rect.height);stars.forEach((star,index)=>{star.pz=star.z;if(!starPaused)star.z-=Number(starSpeed.value);if(star.z<8){star.z=900;star.pz=900;}const x=centerX+star.x/star.z*280;const y=centerY+star.y/star.z*280;const previousX=centerX+star.x/star.pz*280;const previousY=centerY+star.y/star.pz*280;const radius=Math.max(.5,(1-star.z/900)*3.4);starContext.beginPath();starContext.strokeStyle=index%5?'rgba(255,255,255,.84)':'rgba(125,211,252,.94)';starContext.lineWidth=radius;starContext.moveTo(previousX,previousY);starContext.lineTo(x,y);starContext.stroke();});if(!starPaused)starFrame=requestAnimationFrame(drawStars);}starSpeed.addEventListener('input',()=>{document.querySelector('#starSpeedValue').textContent=starSpeed.value;announce('shuttle speed '+starSpeed.value);});starAmount.addEventListener('input',()=>{createStars();drawStars();});document.querySelector('#starReset').addEventListener('click',()=>{createStars();drawStars();});document.querySelector('#starPause').addEventListener('click',event=>{starPaused=!starPaused;event.currentTarget.textContent=starPaused?'Continue':'Pause';event.currentTarget.setAttribute('aria-pressed',String(starPaused));cancelAnimationFrame(starFrame);drawStars();announce(starPaused?'Starfield traversal paused':'Continue Starfield Journey');});addEventListener('resize',()=>{sizeStarCanvas();createStars();drawStars();},{passive:true});sizeStarCanvas();createStars();drawStars();
/* 11DZ_CORE_SCRIPT_END */
const workflowBridgeSpec={"name":"creative-effects-starfield","selector":"[data-core-bridge=\"creative-effects-starfield\"]","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 workflowSpatial=document.querySelector('#workflowSpatial');const workflowSpatialCore=document.querySelector('#workflowCore');const workflowSpatialWidth=document.querySelector('#workflowSpatialWidth');const workflowSpatialZoom=document.querySelector('#workflowSpatialZoom');const workflowSpatialHandle=document.querySelector('#workflowSpatialHandle');const workflowSpatialState={width:64,zoom:1,dragging:false};function workflowSpatialDrive(){workflowSpatial.style.setProperty('--spatial-width',workflowSpatialState.width+'%');workflowSpatial.style.setProperty('--spatial-zoom',String(workflowSpatialState.zoom));workflowSpatialWidth.value=String(workflowSpatialState.width);workflowSpatialZoom.value=String(Math.round(workflowSpatialState.zoom*100));document.querySelector('#workflowSpatialWidthValue').textContent=workflowSpatialState.width+'%';document.querySelector('#workflowSpatialZoomValue').textContent=Math.round(workflowSpatialState.zoom*100)+'%';document.querySelector('#workflowSpatialStatus').textContent='width '+workflowSpatialState.width+'%, zoom '+Math.round(workflowSpatialState.zoom*100)+'%';announce('Cloud Lake Port canvas has been rearranged');}workflowSpatialWidth.addEventListener('input',()=>{workflowSpatialState.width=Number(workflowSpatialWidth.value);workflowSpatialDrive();});workflowSpatialZoom.addEventListener('input',()=>{workflowSpatialState.zoom=Number(workflowSpatialZoom.value)/100;workflowSpatialDrive();});workflowSpatialHandle.addEventListener('pointerdown',event=>{workflowSpatialState.dragging=true;workflowSpatialHandle.setPointerCapture(event.pointerId);});workflowSpatialHandle.addEventListener('pointermove',event=>{if(!workflowSpatialState.dragging)return;const rect=workflowSpatial.getBoundingClientRect();workflowSpatialState.width=Math.max(38,Math.min(82,Math.round((event.clientX-rect.left)/rect.width*100)));workflowSpatialDrive();});workflowSpatialHandle.addEventListener('pointerup',event=>{workflowSpatialState.dragging=false;workflowSpatialHandle.releasePointerCapture(event.pointerId);});workflowSpatialHandle.addEventListener('wheel',event=>{event.preventDefault();workflowSpatialState.zoom=Math.max(.8,Math.min(1.2,workflowSpatialState.zoom+(event.deltaY<0?.05:-.05)));workflowSpatialDrive();},{passive:false});workflowSpatialHandle.addEventListener('keydown',event=>{if(!['ArrowLeft','ArrowRight'].includes(event.key))return;event.preventDefault();workflowSpatialState.width=Math.max(38,Math.min(82,workflowSpatialState.width+(event.key==='ArrowRight'?2:-2)));workflowSpatialDrive();});document.querySelector('#workflowSpatialApply').addEventListener('click',()=>{const bridge=workflowBridgeActivate();document.querySelector('#workflowSpatialStatus').textContent='Effect applied · Width '+workflowSpatialState.width+'%, zoom '+Math.round(workflowSpatialState.zoom*100)+'% · '+bridge.summary;announce(document.querySelector('#workflowSpatialStatus').textContent);});workflowSpatialDrive();
workflowBridgeReset();
</script>
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