From 597b6ba575c7577a13c1fda0230d467495909a8b Mon Sep 17 00:00:00 2001
From: Aleksandr Demchenko <asdemche@gmail.com>
Date: Mon, 23 Feb 2026 14:12:41 +0100
Subject: [PATCH 1/2] Calculate polyline visibility based on strokeWidth

---
 lib/src/layer/polyline_layer/painter.dart     | 36 ++++++++++---------
 lib/src/layer/shared/feature_layer_utils.dart |  9 +++--
 2 files changed, 26 insertions(+), 19 deletions(-)

diff --git a/lib/src/layer/polyline_layer/painter.dart b/lib/src/layer/polyline_layer/painter.dart
index 4656f83a4..5b7f38625 100644
--- a/lib/src/layer/polyline_layer/painter.dart
+++ b/lib/src/layer/polyline_layer/painter.dart
@@ -48,14 +48,16 @@ class _PolylinePainter<R extends Object> extends CustomPainter
         points: projectedPolyline.points,
         shift: shift,
       );
-      if (!areOffsetsVisible(offsets)) return WorldWorkControl.invisible;
 
       final strokeWidth = polyline.useStrokeWidthInMeter
           ? metersToScreenPixels(
-              projectedPolyline.polyline.points.first,
-              polyline.strokeWidth,
-            )
+        projectedPolyline.polyline.points.first,
+        polyline.strokeWidth,
+      )
           : polyline.strokeWidth;
+
+      if (!areOffsetsVisible(offsets, strokeWidth)) return WorldWorkControl.invisible;
+
       final hittableDistance = math.max(
         strokeWidth / 2 + polyline.borderStrokeWidth / 2,
         minimumHitbox,
@@ -133,18 +135,6 @@ class _PolylinePainter<R extends Object> extends CustomPainter
           points: projectedPolyline.points,
           shift: shift,
         );
-        if (!areOffsetsVisible(offsets)) return WorldWorkControl.invisible;
-
-        final hash = polyline.renderHashCode;
-        if (needsLayerSaving || (lastHash != null && lastHash != hash)) {
-          drawPaths();
-        }
-        lastHash = hash;
-        needsLayerSaving = polyline.color.a < 1 ||
-            (polyline.gradientColors?.any((c) => c.a < 1) ?? false);
-
-        // strokeWidth, or strokeWidth + borderWidth if relevant.
-        late double largestStrokeWidth;
 
         late final double strokeWidth;
         if (polyline.useStrokeWidthInMeter) {
@@ -155,7 +145,19 @@ class _PolylinePainter<R extends Object> extends CustomPainter
         } else {
           strokeWidth = polyline.strokeWidth;
         }
-        largestStrokeWidth = strokeWidth;
+
+        if (!areOffsetsVisible(offsets, strokeWidth)) return WorldWorkControl.invisible;
+
+        final hash = polyline.renderHashCode;
+        if (needsLayerSaving || (lastHash != null && lastHash != hash)) {
+          drawPaths();
+        }
+        lastHash = hash;
+        needsLayerSaving = polyline.color.a < 1 ||
+            (polyline.gradientColors?.any((c) => c.a < 1) ?? false);
+
+        // strokeWidth, or strokeWidth + borderWidth if relevant.
+        double largestStrokeWidth = strokeWidth;
 
         final isSolid = polyline.pattern == const StrokePattern.solid();
         final isDashed = polyline.pattern.segments != null;
diff --git a/lib/src/layer/shared/feature_layer_utils.dart b/lib/src/layer/shared/feature_layer_utils.dart
index 981eb775e..0fbd6057f 100644
--- a/lib/src/layer/shared/feature_layer_utils.dart
+++ b/lib/src/layer/shared/feature_layer_utils.dart
@@ -26,7 +26,7 @@ mixin FeatureLayerUtils on CustomPainter {
   /// Determine whether the specified offsets are visible within the viewport
   ///
   /// Always returns `false` if the specified list is empty.
-  bool areOffsetsVisible(Iterable<Offset> offsets) {
+  bool areOffsetsVisible(Iterable<Offset> offsets, [double margin = 0]) {
     if (offsets.isEmpty) {
       return false;
     }
@@ -43,7 +43,12 @@ mixin FeatureLayerUtils on CustomPainter {
       if (maxX < offset.dx) maxX = offset.dx;
       if (maxY < offset.dy) maxY = offset.dy;
     }
-    return viewportRect.overlaps(Rect.fromLTRB(minX, minY, maxX, maxY));
+    return viewportRect.overlaps(Rect.fromLTRB(
+      minX - margin,
+      minY - margin,
+      maxX + margin,
+      maxY + margin,
+    ));
   }
 
   /// Perform the callback in all world copies (until stopped)

From 6bd8035ed68d8f934662606a191af2cda6736419 Mon Sep 17 00:00:00 2001
From: Aleksandr Demchenko <asdemche@gmail.com>
Date: Mon, 23 Feb 2026 19:36:07 +0100
Subject: [PATCH 2/2] Fix formatting

---
 lib/src/layer/polyline_layer/painter.dart | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/lib/src/layer/polyline_layer/painter.dart b/lib/src/layer/polyline_layer/painter.dart
index 5b7f38625..945f39c0e 100644
--- a/lib/src/layer/polyline_layer/painter.dart
+++ b/lib/src/layer/polyline_layer/painter.dart
@@ -51,12 +51,14 @@ class _PolylinePainter<R extends Object> extends CustomPainter
 
       final strokeWidth = polyline.useStrokeWidthInMeter
           ? metersToScreenPixels(
-        projectedPolyline.polyline.points.first,
-        polyline.strokeWidth,
-      )
+              projectedPolyline.polyline.points.first,
+              polyline.strokeWidth,
+            )
           : polyline.strokeWidth;
 
-      if (!areOffsetsVisible(offsets, strokeWidth)) return WorldWorkControl.invisible;
+      if (!areOffsetsVisible(offsets, strokeWidth)) {
+        return WorldWorkControl.invisible;
+      }
 
       final hittableDistance = math.max(
         strokeWidth / 2 + polyline.borderStrokeWidth / 2,
@@ -146,7 +148,8 @@ class _PolylinePainter<R extends Object> extends CustomPainter
           strokeWidth = polyline.strokeWidth;
         }
 
-        if (!areOffsetsVisible(offsets, strokeWidth)) return WorldWorkControl.invisible;
+        if (!areOffsetsVisible(offsets, strokeWidth))
+          return WorldWorkControl.invisible;
 
         final hash = polyline.renderHashCode;
         if (needsLayerSaving || (lastHash != null && lastHash != hash)) {