From 9fe61721610d2e783cdf3a0d30cd3bc1752873c4 Mon Sep 17 00:00:00 2001
From: igurielidze <ilia.gurielidze@autstand.com>
Date: Mon, 30 Mar 2026 21:38:41 +0400
Subject: [PATCH] Spur label: position at 90-degree side (x=0 to x=w2
 rectangle)
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The 90-degree corners are at x=0 in local coords. The rectangular
region from x=0 to x=min(w2,w) always fits inside the trapezoid.
Text is centered in this safe zone — on the straight-edge side,
not the angled side.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 svelte-app/src/lib/canvas/renderer.ts | 11 ++++++-----
 svelte-app/src/lib/export.ts          |  6 ++++--
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/svelte-app/src/lib/canvas/renderer.ts b/svelte-app/src/lib/canvas/renderer.ts
index 4077556..301494e 100644
--- a/svelte-app/src/lib/canvas/renderer.ts
+++ b/svelte-app/src/lib/canvas/renderer.ts
@@ -556,11 +556,12 @@ function drawConveyanceLabel(ctx: CanvasRenderingContext2D, sym: PlacedSymbol) {
   let cx: number, cy: number, availW: number, availH: number;
   if (isSpurType(sym.symbolId)) {
     const w2 = sym.w2 ?? sym.w;
-    // Center text at the right-angle corner (w, h) where the most space is.
-    // The right edge at mid-height is at (w2+w)/2. Shift further right.
-    cx = sym.x + sym.w * 0.65;
-    cy = sym.y + sym.h * 0.65;
-    availW = sym.w;
+    // The 90° corners are at x=0 (left edge). The rectangular region
+    // from x=0 to x=min(w2,w) always fits inside the trapezoid.
+    const safeW = Math.min(w2, sym.w);
+    cx = sym.x + safeW / 2;
+    cy = sym.y + sym.h / 2;
+    availW = safeW;
     availH = sym.h;
   } else {
     cx = sym.x + sym.w / 2;
diff --git a/svelte-app/src/lib/export.ts b/svelte-app/src/lib/export.ts
index 0e18852..20f226d 100644
--- a/svelte-app/src/lib/export.ts
+++ b/svelte-app/src/lib/export.ts
@@ -43,8 +43,10 @@ function emitConveyanceLabelInner(lines: string[], sym: PlacedSymbol) {
     // Mirror: label follows the mirrored shape naturally
     textRotDeg = (textRotRad * 180) / Math.PI;
   } else if (isSpurType(sym.symbolId)) {
-    labelCx = sym.x + sym.w * 0.65;
-    labelCy = sym.y + sym.h * 0.65;
+    const w2 = sym.w2 ?? sym.w;
+    const safeW = Math.min(w2, sym.w);
+    labelCx = sym.x + safeW / 2;
+    labelCy = sym.y + sym.h / 2;
     availH = sym.h;
   } else if (isInductionType(sym.symbolId)) {
     const stripTopY = sym.y + sym.h * INDUCTION_CONFIG.stripTopFrac;