From 9d34f30daf246df318a4754856bdc80c9419d20c Mon Sep 17 00:00:00 2001
From: AskaEth <i@yeij.top>
Date: Sat, 25 Jul 2026 17:21:56 +0800
Subject: [PATCH] refactor: continuous arc+line stroke for seamless gauge (no
 visible tick gaps)

---
 dashboards/forza_composite/index.html | 163 ++++++++++++++------------
 1 file changed, 86 insertions(+), 77 deletions(-)

diff --git a/dashboards/forza_composite/index.html b/dashboards/forza_composite/index.html
index e3b1f38..f30c254 100644
--- a/dashboards/forza_composite/index.html
+++ b/dashboards/forza_composite/index.html
@@ -14,25 +14,20 @@ html,body{width:100%;height:100%;overflow:hidden;background:#0a0a0f;color:#fff;
 #box.cover{min-width:100vw;min-height:100vh}
 #box.fill{width:100vw;height:100vh}
 #content{position:relative;width:100%;height:100%;background:#0a0a0f}
-
 #rpm-area{position:absolute;left:2%;top:4%;width:62%;height:82%}
 #rpm-canvas{width:100%;height:100%}
-
 #speed-area{position:absolute;left:2%;bottom:6%;width:62%;text-align:center}
 #speed-val{font-size:min(12vw,120px);font-weight:200;line-height:1;letter-spacing:-.02em}
 #speed-unit{font-size:min(3vw,22px);color:rgba(255,255,255,.2);letter-spacing:.25em;margin-top:4px}
-
 #gear-area{position:absolute;right:5%;top:50%;transform:translateY(-55%)}
 #gear-box{width:min(20vw,170px);height:min(20vw,170px);border-radius:50%;border:1px solid rgba(255,255,255,.1);display:flex;align-items:center;justify-content:center}
 #gear-box span{font-size:min(12vw,100px);font-weight:200;transition:.1s}
-
 #pedals{position:absolute;right:3%;top:5%;width:20%}
 .pedal{margin-bottom:16px}
 .pedal .pl{font-size:min(1.8vw,13px);color:rgba(255,255,255,.2);margin-bottom:5px;letter-spacing:.15em}
 .pedal .pb{height:8px;background:rgba(255,255,255,.06);overflow:hidden}
 .pedal .pf{height:100%;transition:width .06s linear}
 #tf{background:#fff}#bf{background:rgba(255,255,255,.4)}
-
 #status{position:absolute;right:4%;bottom:6%;width:20%}
 .st{margin-bottom:14px}
 .st .sl{font-size:min(1.6vw,12px);color:rgba(255,255,255,.2);margin-bottom:4px;display:flex;justify-content:space-between}
@@ -58,89 +53,103 @@ html,body{width:100%;height:100%;overflow:hidden;background:#0a0a0f;color:#fff;
 <script>
 const M={aspect_ratio:"16:9",render_mode:"contain"};let GAME_ID='';
 (function(){
- const box=document.getElementById('box'),canvas=document.getElementById('rpm-canvas'),
-       sV=document.getElementById('speed-val'),sU=document.getElementById('speed-unit'),
-       gV=document.getElementById('gear-val'),gBox=document.getElementById('gear-box'),
-       tF=document.getElementById('tf'),bF=document.getElementById('bf'),
-       fF=document.getElementById('ff'),fV=document.getElementById('fv'),
-       wF=document.getElementById('wf'),wV=document.getElementById('wv');
- const proto=location.protocol==='https:'?'wss:':'ws:',wsUrl=proto+'//'+location.host+'/ws';
- const ctx=canvas.getContext('2d');
- let ws,rt,lR=-1,lG=-999;
+const box=document.getElementById('box'),canvas=document.getElementById('rpm-canvas'),
+      sV=document.getElementById('speed-val'),sU=document.getElementById('speed-unit'),
+      gV=document.getElementById('gear-val'),gBox=document.getElementById('gear-box'),
+      tF=document.getElementById('tf'),bF=document.getElementById('bf'),
+      fF=document.getElementById('ff'),fV=document.getElementById('fv'),
+      wF=document.getElementById('wf'),wV=document.getElementById('wv');
+const proto=location.protocol==='https:'?'wss:':'ws:',wsUrl=proto+'//'+location.host+'/ws';
+const ctx=canvas.getContext('2d');
+let ws,rt,lR=-1,lG=-999;
+const Ca=320,Cb=420,Cr=280,As=180,Ae=270;
 
- const N=66,Na=Math.round(N*.5),Nl=N-Na,Ca=320,Cb=420,Cr=280,As=180,Ae=270;
+function d2r(d){return d*Math.PI/180}
+function pr(r){if(!r||r==='auto')return null;const p=r.split(':');if(p.length===2)return +p[0]/+p[1]}
 
- function d2r(d){return d*Math.PI/180}
- function pr(r){if(!r||r==='auto')return null;const p=r.split(':');if(p.length===2)return +p[0]/+p[1]}
+function apply(){
+ const rt=pr(M.aspect_ratio||'16:9'),md=M.render_mode||'contain';
+ if(!rt){box.style.width='100vw';box.style.height='100vh';box.className='fill';return}
+ const vw=window.innerWidth,vh=window.innerHeight,vr=vw/vh;let cw,ch;
+ if(md==='cover'){cw=vw;ch=vw/rt;box.className='cover'}
+ else{box.className='contain';cw=vr>rt?vh*rt:vw;ch=vr>rt?vh:vw/rt}
+ box.style.width=cw+'px';box.style.height=ch+'px'
+}
 
- function apply(){
-  const rt=pr(M.aspect_ratio||'16:9'),md=M.render_mode||'contain';
-  if(!rt){box.style.width='100vw';box.style.height='100vh';box.className='fill';return}
-  const vw=window.innerWidth,vh=window.innerHeight,vr=vw/vh;let cw,ch;
-  if(md==='cover'){cw=vw;ch=vw/rt;box.className='cover'}
-  else{box.className='contain';cw=vr>rt?vh*rt:vw;ch=vr>rt?vh:vw/rt}
-  box.style.width=cw+'px';box.style.height=ch+'px'
+function sz(){
+ const r=canvas.parentElement.getBoundingClientRect(),d=window.devicePixelRatio||1;
+ canvas.width=r.width*d;canvas.height=r.height*d;
+ canvas.style.width=r.width+'px';canvas.style.height=r.height+'px';
+ ctx.setTransform(d,0,0,d,0,0);
+}
+
+function draw(cur,max){
+ max=max||8000;cur=cur||0;sz();
+ const W=canvas.width/devicePixelRatio,H=canvas.height/devicePixelRatio;
+ ctx.clearRect(0,0,W,H);
+ const sx=Ca/640*W,sy=Cb/480*H,sr=Cr/640*W;
+ const gw=Math.max(36,W/18);
+ const ae=d2r(Ae),ex=sx+sr*Math.cos(ae),ey=sy+sr*Math.sin(ae),lx=W*.93;
+ const arcLen=Math.PI*2*sr*((Ae-As)/360),lineLen=lx-ex,totalLen=arcLen+lineLen;
+ const rl=max*.85;
+
+ // background stroke
+ ctx.beginPath();
+ ctx.arc(sx,sy,sr,d2r(As),d2r(Ae),true);
+ ctx.lineTo(lx,ey);
+ ctx.strokeStyle='rgba(255,255,255,.04)';
+ ctx.lineWidth=gw;ctx.lineCap='round';ctx.lineJoin='round';
+ ctx.stroke();
+
+ // progress stroke
+ const pc=Math.min(cur/max,1);
+ if(pc>0){
+  const pd=pc*totalLen;
+  ctx.beginPath();
+  if(pd<=arcLen){
+   ctx.arc(sx,sy,sr,d2r(As),d2r(As+(Ae-As)*(pd/arcLen)),true);
+  }else{
+   ctx.arc(sx,sy,sr,d2r(As),d2r(Ae),true);
+   ctx.lineTo(ex+(pd-arcLen)/lineLen*(lx-ex),ey);
+  }
+  ctx.strokeStyle=cur>=rl?'rgba(255,50,35,.95)':'rgba(255,255,255,.85)';
+  ctx.lineWidth=gw;ctx.lineCap='round';ctx.lineJoin='round';
+  ctx.stroke();
  }
 
- function sz(){
-  const r=canvas.parentElement.getBoundingClientRect(),d=window.devicePixelRatio||1;
-  canvas.width=r.width*d;canvas.height=r.height*d;
-  canvas.style.width=r.width+'px';canvas.style.height=r.height+'px';
-  ctx.setTransform(d,0,0,d,0,0);
+ // scale marks
+ const mr=sr-gw/2-6,pr=sr+gw/2+6;
+ for(let r=0;r<=max;r+=2000){
+  const a=d2r(As+(Ae-As)*(r/max));
+  ctx.beginPath();ctx.moveTo(sx+mr*Math.cos(a),sy+mr*Math.sin(a));ctx.lineTo(sx+pr*Math.cos(a),sy+pr*Math.sin(a));
+  ctx.strokeStyle=r>=rl?'rgba(255,255,255,.15)':'rgba(255,255,255,.08)';
+  ctx.lineWidth=r%4000===0?2.5:1;ctx.stroke();
+  if(r%4000===0){ctx.fillStyle='rgba(255,255,255,.22)';ctx.font=`${Math.max(13,W/38)|0}px sans-serif`;ctx.textAlign='center';ctx.fillText(Math.round(r/1000),sx+(pr+22)*Math.cos(a),sy+(pr+22)*Math.sin(a)+5)}
  }
 
- function tp(i){
-  const W=canvas.width/devicePixelRatio,H=canvas.height/devicePixelRatio;
-  const sx=Ca/640*W,sy=Cb/480*H,sr=Cr/640*W;
-  if(i<Na){const p=i/(Na-1),a=d2r(As+(Ae-As)*p);return{x:sx+sr*Math.cos(a),y:sy+sr*Math.sin(a),r:a-Math.PI/2}}
-  const ae=d2r(Ae),ex=sx+sr*Math.cos(ae),ey=sy+sr*Math.sin(ae),p=(i-Na+1)/(Nl-1);
-  return{x:ex+p*(W*.93-ex),y:ey,r:0}
- }
+ // RPM number
+ ctx.fillStyle='#fff';ctx.font=`200 ${Math.max(48,W/12)|0}px sans-serif`;ctx.textAlign='center';
+ ctx.fillText(Math.round(cur).toLocaleString(),sx,sy-180);
+ ctx.fillStyle='rgba(255,255,255,.12)';ctx.font=`${Math.max(12,W/44)|0}px sans-serif`;
+ ctx.fillText('\u00d71000 rpm',sx,sy-155);
 
- function draw(cur,max){
-  max=max||8000;cur=cur||0;sz();
-  const W=canvas.width/devicePixelRatio,H=canvas.height/devicePixelRatio;
-  ctx.clearRect(0,0,W,H);
-  const tw=Math.max(108,W/5),th=Math.max(36,H/12),gap=Math.max(3,tw*.04);
+ // redline
+ ctx.strokeStyle='rgba(255,40,30,.1)';ctx.lineWidth=1;ctx.setLineDash([3,6]);
+ ctx.beginPath();ctx.moveTo(sx,sy);ctx.lineTo(sx+sr*Math.cos(d2r(As+(Ae-As)*.85)),sy+sr*Math.sin(d2r(As+(Ae-As)*.85)));ctx.stroke();ctx.setLineDash([])
+}
 
- // tick thickness varies: 2x at bottom arc, 1x at top
- function twScale(i){if(i>=Na)return 1;return 2-(i/(Na-1))}
+function cn(){ws=new WebSocket(wsUrl);ws.onopen=()=>{if(rt){clearTimeout(rt);rt=null}}
+ ws.onmessage=(e)=>{try{const m=JSON.parse(e.data);if(m.type==='connected')GAME_ID=m.selected_game_id||'';if(m.type==='telemetry')up(m.data)}catch(e){}}
+ ws.onclose=()=>{rt=setTimeout(cn,2000)}}
 
- // bg ticks
- for(let i=0;i<N;i++){const p=tp(i),s=twScale(i),w=(tw-gap)*s,h=th*s;ctx.save();ctx.translate(p.x,p.y);ctx.rotate(p.r);ctx.beginPath();ctx.roundRect(-w/2,-h/2,w,h,th*.4);ctx.fillStyle='rgba(255,255,255,.04)';ctx.fill();ctx.restore()}
+function up(d){const rpm=d.rpm||0,mr=d.max_rpm||8000,g=d.gear||0,sp=d.speed_kmh||0;
+ if(Math.abs(rpm-lR)>25||g!==lG){lR=rpm;lG=g;draw(rpm,mr)}
+ sV.textContent=Math.round(sp);gV.textContent=g===0?'N':g===11?'R':g===21?'P':String(g);
+ tF.style.width=(d.throttle*100).toFixed(0)+'%';bF.style.width=(d.brake*100).toFixed(0)+'%';
+ const fp=Math.round((d.fuel||1)*100);fF.style.width=fp+'%';fV.textContent=fp+'%';
+ const et=d.engine_temp||0;if(et>0){const ep=Math.min(et/120,1)*100;wF.style.width=ep+'%';wV.textContent=Math.round(et)+'\u00B0C'}}
 
- // progress
- const pc=Math.min(cur/max,1),on=Math.round(pc*N),rl=max*.85;
- for(let i=0;i<on;i++){const p=tp(i),s=twScale(i),w=(tw-gap)*s,h=th*s;ctx.save();ctx.translate(p.x,p.y);ctx.rotate(p.r);ctx.beginPath();ctx.roundRect(-w/2,-h/2,w,h,th*.4);ctx.fillStyle=cur>=rl?'rgba(255,50,35,.95)':'rgba(255,255,255,.85)';ctx.fill();ctx.restore()}
-
-  // scale nums - larger
-  const sx=Ca/640*W,sy=Cb/480*H,sr=Cr/640*W;
-  ctx.fillStyle='rgba(255,255,255,.2)';ctx.font=`${Math.max(12,W/42)|0}px sans-serif`;ctx.textAlign='center';
-  for(let r=0;r<=max;r+=2000){const p=r/max,a=d2r(As+(Ae-As)*p);ctx.fillText(Math.round(r/1000),sx+(sr-54)*Math.cos(a),sy+(sr-54)*Math.sin(a)+4)}
-
-  // RPM number - big, high up
-  ctx.fillStyle='#fff';ctx.font=`200 ${Math.max(48,W/12)|0}px sans-serif`;ctx.textAlign='center';
-  ctx.fillText(Math.round(cur).toLocaleString(),sx,sy-180);
-  ctx.fillStyle='rgba(255,255,255,.12)';ctx.font=`${Math.max(12,W/44)|0}px sans-serif`;
-  ctx.fillText('\u00d71000 rpm',sx,sy-155);
-
-  // redline
-  ctx.strokeStyle='rgba(255,40,30,.1)';ctx.lineWidth=1;ctx.setLineDash([3,6]);ctx.beginPath();
-  const ra=d2r(As+(Ae-As)*.85);ctx.moveTo(sx,sy);ctx.lineTo(sx+sr*Math.cos(ra),sy+sr*Math.sin(ra));ctx.stroke();ctx.setLineDash([])
- }
-
- function cn(){ws=new WebSocket(wsUrl);ws.onopen=()=>{if(rt){clearTimeout(rt);rt=null}}
-  ws.onmessage=(e)=>{try{const m=JSON.parse(e.data);if(m.type==='connected')GAME_ID=m.selected_game_id||'';if(m.type==='telemetry')up(m.data)}catch(e){}}
-  ws.onclose=()=>{rt=setTimeout(cn,2000)}}
-
- function up(d){const rpm=d.rpm||0,mr=d.max_rpm||8000,g=d.gear||0,sp=d.speed_kmh||0;
-  if(Math.abs(rpm-lR)>25||g!==lG){lR=rpm;lG=g;draw(rpm,mr)}
-  sV.textContent=Math.round(sp);gV.textContent=g===0?'N':g===11?'R':g===21?'P':String(g);
-  tF.style.width=(d.throttle*100).toFixed(0)+'%';bF.style.width=(d.brake*100).toFixed(0)+'%';
-  const fp=Math.round((d.fuel||1)*100);fF.style.width=fp+'%';fV.textContent=fp+'%';
-  const et=d.engine_temp||0;if(et>0){const ep=Math.min(et/120,1)*100;wF.style.width=ep+'%';wV.textContent=Math.round(et)+'\u00B0C'}}
-
- draw(0,8000);apply();window.addEventListener('resize',()=>{apply();draw(lR>0?lR:0,8000)});cn()
+draw(0,8000);apply();window.addEventListener('resize',()=>{apply();draw(lR>0?lR:0,8000)});cn()
 })();
 </script>
 </body>