Doodle Jump JavaScript: Separate Height From Camera

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<body class="game"><main><header><div class="eyebrow">Original interactive state lab</div><h1>Doodle Jump JavaScript: Separate Height From Camera</h1><p>A repeated bounce from one platform should not keep adding its height to a score. <mark>Track the highest world position once</mark> and let the camera follow that record.</p></header>
<nav><button type="button" id="start">Start / Resume</button><button type="button" id="left">Left pulse</button><button type="button" id="right">Right pulse</button><button type="button" id="pause">Pause</button><button type="button" id="step">Step 1/60 s</button><button type="button" id="landingExample">First landing example</button><button type="button" id="reset">Reset</button></nav><svg id="field" viewBox="0 0 320 240" role="img" aria-label="Original jump field in screen coordinates; world-height summary follows."></svg><p id="result" class="result" role="status"></p><div id="ledger" class="ledger"></div><p id="landing"></p><section><h2>One-way crossing inspector</h2><button type="button" id="descending">Descending42→38</button><button type="button" id="ascending">Ascending38→42</button><p id="crossing" role="status">Choose a crossing.</p></section>
<footer>Reset returns world height and camera floor to zero. The crossing explanations are separate from the live game.</footer></main><script>
(()=>{'use strict';const q=id=>document.querySelector('#'+id);const set=(id,value)=>{q(id).textContent=String(value);};const on=(id,callback)=>q(id).addEventListener('click',callback);const escapeHtml=value=>String(value).replace(/[&<>"']/g,c=>({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'}[c]));const table=(id,heads,rows)=>{q(id).innerHTML='<table><thead><tr>'+heads.map(h=>'<th scope="col">'+escapeHtml(h)+'</th>').join('')+'</tr></thead><tbody>'+rows.map(row=>'<tr>'+row.map(value=>'<td>'+escapeHtml(value)+'</td>').join('')+'</tr>').join('')+'</tbody></table>';};const field=(id,label,value='')=>'<label for="'+id+'">'+escapeHtml(label)+'</label><input id="'+id+'" value="'+escapeHtml(value)+'">';const btn=(id,label)=>'<button type="button" id="'+id+'">'+escapeHtml(label)+'</button>';const fmt=value=>Number(value).toFixed(6);
(function(){let x=152,y=0,vy=280,high=0,floor=0,phase='Ready',horizontal=0,steps=0,lastLanding='No landing yet.';function render(){const platforms=Array.from({length:Math.ceil((floor+260)/40)+1},(_,i)=>({id:i,h:40*i,x:i%2?150:112})).filter(p=>p.h>=floor-20);q('field').innerHTML='<rect width="320" height="240" fill="#eaf3f5"/>'+platforms.map(p=>`<rect x="${p.x}" y="${240-(p.h-floor)}" width="96" height="5" fill="#2c6752"/>`).join('')+`<rect x="${x}" y="${240-(y-floor)-16}" width="16" height="16" fill="#9d4b33"/>`;set('result',`${phase}; highest bottom ${high.toFixed(3)}; camera floor ${floor.toFixed(3)}; steps ${steps}.`);set('ledger',`World bottom ${y.toFixed(3)}; top ${(y+16).toFixed(3)}; x ${x.toFixed(3)}; vertical velocity ${vy.toFixed(3)}.`);set('landing','Last landing: '+lastLanding);}function tick(){if(!['Running','Paused'].includes(phase))return;const dt=1/60,old=y,oldVelocity=vy,oldX=x;const peak=(bottom,velocity,duration)=>{const end=bottom+velocity*duration-280*duration*duration;return velocity>0&&velocity/560<=duration?Math.max(bottom,end,bottom+velocity*velocity/1120):Math.max(bottom,end);};x=Math.max(0,Math.min(304,x+horizontal*dt));horizontal=0;const freeEnd=old+oldVelocity*dt-280*dt*dt,freePeak=peak(old,oldVelocity,dt),contacts=[];for(let i=0;i<=Math.ceil(freePeak/40);i++){const h=40*i,disc=oldVelocity*oldVelocity+1120*(old-h);if(disc<0)continue;const t=(oldVelocity+Math.sqrt(disc))/560;if(t<0||t>dt||oldVelocity-560*t>=0)continue;const px=i%2?150:112,crossingX=oldX+(x-oldX)*(t/dt);if(crossingX<px+96&&crossingX+16>px)contacts.push({id:i,h,t});}contacts.sort((a,b)=>a.t-b.t||a.id-b.id);const contact=contacts[0];if(contact){const remaining=dt-contact.t;y=contact.h+280*remaining-280*remaining*remaining;vy=280-560*remaining;high=Math.max(high,peak(old,oldVelocity,contact.t),peak(contact.h,280,remaining));lastLanding='P'+contact.id+' at '+(steps*dt+contact.t).toFixed(6)+' s; remainder '+remaining.toFixed(6)+' s integrated after bounce.';}else{y=freeEnd;vy=oldVelocity-560*dt;high=Math.max(high,freePeak);}floor=Math.max(0,high-120);steps++;if(y+16<floor)phase='Lost';render();}on('start',()=>{if(phase==='Ready'||phase==='Paused'){phase='Running';render();}});on('pause',()=>{if(phase==='Running'){phase='Paused';render();}});on('left',()=>{if(phase==='Running'||phase==='Paused'){horizontal=-100;tick();}});on('right',()=>{if(phase==='Running'||phase==='Paused'){horizontal=100;tick();}});on('step',()=>{if(phase==='Paused')tick();});on('reset',()=>{x=152;y=high=floor=horizontal=steps=0;vy=280;phase='Ready';lastLanding='No landing yet.';set('crossing','Choose a crossing.');render();});on('landingExample',()=>{const elapsed=49/60;x=152;y=280*elapsed-280*elapsed*elapsed;vy=280-560*elapsed;high=70;floor=0;horizontal=0;steps=49;phase='Paused';lastLanding='No landing yet; first-flight state at step 49. Press Step.';render();});on('descending',()=>set('crossing','Descending42→38 crosses platform40 with horizontal overlap: land at40; bounce velocity+280.'));on('ascending',()=>set('crossing','Ascending38→42: no landing; upward crossing ignored.'));setInterval(()=>{if(phase==='Running')tick();},1000/60);document.addEventListener('visibilitychange',()=>{if(document.hidden&&phase==='Running'){phase='Paused';horizontal=0;render();}});render();})();})();
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