diff --git a/ArchitectureColoredPainting/src/Editor/LayerStyle.cpp b/ArchitectureColoredPainting/src/Editor/LayerStyle.cpp
index 5be1b72..5115658 100644
--- a/ArchitectureColoredPainting/src/Editor/LayerStyle.cpp
+++ b/ArchitectureColoredPainting/src/Editor/LayerStyle.cpp
@@ -197,6 +197,25 @@ bool LayerStyleContainer::dropStyle(const QString& styleName)
 	return true;
 }
 
+float LayerStyleContainer::boundingBoxAffectValue() {
+    float maxLineWidth = 0;
+    auto strokeStyle = styles[StrokeElementLayerStyle::displayName()];
+    if (strokeStyle != nullptr) {
+        auto strokeElementLayerStyle = dynamic_cast<StrokeElementLayerStyle*>(strokeStyle.get());
+        if (strokeElementLayerStyle != nullptr) {
+            auto leftStyleStroke = strokeElementLayerStyle->strokePair.first;
+            auto rightStyleStroke = strokeElementLayerStyle->strokePair.second;
+            if (leftStyleStroke != nullptr) {
+                maxLineWidth = std::max(maxLineWidth, leftStyleStroke->halfWidth);
+            }
+            if (rightStyleStroke != nullptr) {
+                maxLineWidth = std::max(maxLineWidth, rightStyleStroke->halfWidth);
+            }
+        }
+    }
+    return maxLineWidth;
+}
+
 inline size_t LayerStyleContainer::getHash() const
 {
     return hash;
diff --git a/ArchitectureColoredPainting/src/Editor/LayerStyle.h b/ArchitectureColoredPainting/src/Editor/LayerStyle.h
index a310b6e..ed328bb 100644
--- a/ArchitectureColoredPainting/src/Editor/LayerStyle.h
+++ b/ArchitectureColoredPainting/src/Editor/LayerStyle.h
@@ -56,6 +56,7 @@ public:
     std::unique_ptr<LayerStyle> makeUnusedStyle(const QString& styleName) const;
     bool useStyle(const std::shared_ptr<LayerStyle>& style);
     bool dropStyle(const QString& styleName);
+    float boundingBoxAffectValue();
     size_t getHash() const;
 
     /**