Add fixed constellation inspection mode

plugin/contents/ui/dancer.html

@@ -1219,6 +1219,7 @@ const ctx    = canvas.getContext('2d');
 
 let obsLat = -24.72, obsLon = -53.74;  // Toledo-PR; sobrescrito pela config
 let showConstellations = false;
+let constellationPreviewId = null;
 const constellationArtImages = new Map();
 if (typeof CONSTELLATIONS !== 'undefined') {
   for (const constellation of CONSTELLATIONS) {
@@ -1485,12 +1486,16 @@ function constellationArtTransform(source, target) {
   return [a, b, -b, a, e, f];
 }
 
-function drawConstellationArt(c, constellation, lst, W, horizonPx) {
+function drawConstellationArt(c, constellation, lst, W, horizonPx, previewProjector) {
   const art = constellation.art;
   const imageEntry = constellationArtImages.get(constellation.id);
   if (!art || !imageEntry || !imageEntry.render) return;
 
   const target = art.anchors.map(anchor => {
+    if (previewProjector) {
+      const sc = previewProjector(anchor.sky);
+      return { x: sc.x, y: sc.y, alt: ALT_TOP / 2 };
+    }
     const aa = altAz(anchor.sky[0], anchor.sky[1], lst);
     const daz = ((aa.az - VIEW_AZ) % 360 + 540) % 360 - 180;
     return {
@@ -1541,31 +1546,66 @@ function drawConstellationArt(c, constellation, lst, W, horizonPx) {
   c.restore();
 }
 
+function makeConstellationPreviewProjector(constellation, W, horizonPx) {
+  const centerRa = constellation.label ? constellation.label[0] : 0;
+  const centerDec = constellation.label ? constellation.label[1] : 0;
+  const flatten = point => {
+    const dra = ((point[0] - centerRa) % 360 + 540) % 360 - 180;
+    return [dra * Math.cos(centerDec * DEG), point[1] - centerDec];
+  };
+  const points = constellation.lines.flat().map(flatten);
+  const xs = points.map(p => p[0]), ys = points.map(p => p[1]);
+  const minX = Math.min(...xs), maxX = Math.max(...xs);
+  const minY = Math.min(...ys), maxY = Math.max(...ys);
+  const scale = Math.min(
+    W * 0.34 / Math.max(1, maxX - minX),
+    horizonPx * 0.48 / Math.max(1, maxY - minY)
+  );
+  const midX = (minX + maxX) / 2, midY = (minY + maxY) / 2;
+  const screenX = W / 2, screenY = horizonPx * 0.42;
+  return point => {
+    const p = flatten(point);
+    return { x: screenX + (p[0] - midX) * scale,
+             y: screenY - (p[1] - midY) * scale };
+  };
+}
+
 /* Figuras convencionais dos 12 signos zodiacais, ancoradas em RA/Dec J2000.
    Arte, linhas e estrelas reais ficam sobrepostas nesta ordem. */
 function drawConstellations(c, lst, W, H, horizonPx) {
   if (!showConstellations || typeof CONSTELLATIONS === 'undefined') return;
   const rankAlpha = [0, 0.52, 0.38, 0.25];
   const rankWidth = [0, 1.35, 1.05, 0.82];
+  const preview = constellationPreviewId
+    ? CONSTELLATIONS.find(item => item.id === constellationPreviewId)
+    : null;
+  const visible = preview ? [preview] : CONSTELLATIONS;
+  const previewProjector = preview
+    ? makeConstellationPreviewProjector(preview, W, horizonPx)
+    : null;
+  const projectPoint = point => {
+    if (previewProjector) return previewProjector(point);
+    const aa = altAz(point[0], point[1], lst);
+    return skyToScreen(aa.alt, aa.az, W, horizonPx);
+  };
 
   c.save();
   c.lineCap = 'round';
   c.lineJoin = 'round';
   c.shadowColor = 'rgba(60,185,255,0.65)';
   c.shadowBlur = 7;
-  for (const constellation of CONSTELLATIONS) {
+  for (const constellation of visible) {
-    drawConstellationArt(c, constellation, lst, W, horizonPx);
+    drawConstellationArt(c, constellation, lst, W, horizonPx, previewProjector);
   }
-  for (const constellation of CONSTELLATIONS) {
+  for (const constellation of visible) {
     const rank = Math.max(1, Math.min(3, constellation.rank || 3));
-    c.strokeStyle = `rgba(105,205,255,${rankAlpha[rank]})`;
+    c.strokeStyle = `rgba(105,205,255,${preview ? 0.82 : rankAlpha[rank]})`;
-    c.lineWidth = rankWidth[rank];
+    c.lineWidth = preview ? 2.1 : rankWidth[rank];
     for (const line of constellation.lines) {
       c.beginPath();
       let previous = null;
       for (const point of line) {
-        const aa = altAz(point[0], point[1], lst);
+        const sc = projectPoint(point);
-        const sc = skyToScreen(aa.alt, aa.az, W, horizonPx);
         if (!sc) {
           previous = null;
           continue;
@@ -1583,6 +1623,22 @@ function drawConstellations(c, lst, W, H, horizonPx) {
     }
   }
 
+  if (preview) {
+    const seen = new Set();
+    c.shadowColor = 'rgba(160,225,255,0.95)';
+    c.shadowBlur = 9;
+    c.fillStyle = 'rgba(225,245,255,0.96)';
+    for (const point of preview.lines.flat()) {
+      const key = point.join(',');
+      if (seen.has(key)) continue;
+      seen.add(key);
+      const sc = projectPoint(point);
+      c.beginPath();
+      c.arc(sc.x, sc.y, Math.max(2.4, H * 0.0018), 0, Math.PI * 2);
+      c.fill();
+    }
+  }
+
   /* Todos os signos recebem nome; colisões na tela ainda são evitadas. */
   c.shadowBlur = 5;
   c.font = `${Math.max(10, Math.round(H * 0.0105))}px ui-monospace, monospace`;
@@ -1590,10 +1646,9 @@ function drawConstellations(c, lst, W, H, horizonPx) {
   c.textBaseline = 'middle';
   c.fillStyle = 'rgba(170,225,255,0.66)';
   const occupied = [];
-  for (const constellation of CONSTELLATIONS) {
+  for (const constellation of visible) {
     if (!constellation.label) continue;
-    const aa = altAz(constellation.label[0], constellation.label[1], lst);
+    const sc = projectPoint(constellation.label);
-    const sc = skyToScreen(aa.alt, aa.az, W, horizonPx);
     if (!sc || sc.y < 24 || sc.y > horizonPx - 18) continue;
     const width = c.measureText(constellation.name).width + 14;
     const box = { x1: sc.x - width / 2, y1: sc.y - 9,
@@ -1601,7 +1656,7 @@ function drawConstellations(c, lst, W, H, horizonPx) {
     if (occupied.some(o => box.x1 < o.x2 && box.x2 > o.x1 &&
                            box.y1 < o.y2 && box.y2 > o.y1)) continue;
     occupied.push(box);
-    c.fillText(constellation.name, sc.x, sc.y);
+    c.fillText(preview ? `Prévia: ${constellation.name}` : constellation.name, sc.x, sc.y);
   }
   c.restore();
 }
@@ -1627,6 +1682,23 @@ let constellationsFileVal = null;
     .finally(() => setTimeout(pollConstellationsFile, 800));
 })();
 
+/* Modo de inspeção temporário: centraliza um único signo sem alterar suas
+   coordenadas internas. Controlado por preview-constellation.sh. */
+let constellationPreviewFileVal = null;
+(function pollConstellationPreviewFile() {
+  fetch('file:///tmp/skeledance-constellation-preview?t=' + Date.now())
+    .then(r => r.text())
+    .then(t => {
+      const v = t.trim();
+      if (v === constellationPreviewFileVal) return;
+      constellationPreviewFileVal = v;
+      constellationPreviewId = CONSTELLATIONS.some(item => item.id === v) ? v : null;
+      projectSky();
+    })
+    .catch(() => {})
+    .finally(() => setTimeout(pollConstellationPreviewFile, 800));
+})();
+
 /* ── Passo de projeção: recalcula posições de tela (a cada 30s o céu gira
    ~0.125°, imperceptível). Camada estática (Via Láctea + estrelas fracas)
    é pré-renderizada fora da tela; só as brilhantes cintilam por frame.

preview-constellation.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+STATE_FILE=/tmp/skeledance-constellation-preview
+SIGN=${1:-Vir}
+
+if [ "$SIGN" = "off" ]; then
+  printf 'off\n' > "$STATE_FILE"
+  printf 'Prévia de constelação desativada\n'
+else
+  printf '%s\n' "$SIGN" > "$STATE_FILE"
+  printf 'Prévia fixa: %s\n' "$SIGN"
+fi