pathways: smarter placement - fine-grained nearest fit + snap to neighbor edges, no more coarse tile-width jumps

1 files changed, 27 insertions, 7 deletions

diff --git a/public/app.js b/public/app.js
index b8aeb68..6411bf7 100644
--- a/public/app.js
+++ b/public/app.js
@@ -78,14 +78,34 @@ function placeRect(w, h, from, dir) {
   const base = baseRect(w, h, from, dir)
   if (!collides(base)) return base
   const horiz = dir === "N" || dir === "S"
-  for (let k = 1; k < 60; k++) {
-    const off = k * (w + GAP)
-    const a = horiz ? { ...base, x: base.x + off } : { ...base, y: base.y + off }
-    if (!collides(a)) return a
-    const b = horiz ? { ...base, x: base.x - off } : { ...base, y: base.y - off }
-    if (!collides(b)) return b
+  const fixed = horiz ? base.y : base.x
+  const slide0 = horiz ? base.x : base.y
+  let best = null
+  for (let k = 1; k < 1000; k++) {
+    for (const off of [k * 2, -k * 2]) {
+      const rect = horiz ? { x: slide0 + off, y: fixed, w, h } : { x: fixed, y: slide0 + off, w, h }
+      if (!collides(rect)) {
+        best = rect
+        break
+      }
+    }
+    if (best) break
+  }
+  if (!best) return base
+  let snap = null
+  for (const t of tiles.values()) {
+    const r = t.rect
+    const lines = horiz
+      ? [r.x - w - GAP, r.x + r.w + GAP, r.x + (r.w - w) / 2]
+      : [r.y - h - GAP, r.y + r.h + GAP, r.y + (r.h - h) / 2]
+    for (const c of lines) {
+      const at = horiz ? best.x : best.y
+      if (Math.abs(c - at) > GAP) continue
+      const rect = horiz ? { x: c, y: fixed, w, h } : { x: fixed, y: c, w, h }
+      if (!collides(rect)) snap = rect
+    }
   }
-  return base
+  return snap || best
 }
 
 function addTile(info, rect) {