MultiPolygonにarea()とperimeter()を追加(#1185) (#1187)

Siv3D · Jan 18, 2024 · 0e0b5fc · 0e0b5fc
1 parent 3a5a293
commit 0e0b5fc
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Showing 2 changed files with 30 additions and 0 deletions.
diff --git a/Siv3D/include/Siv3D/MultiPolygon.hpp b/Siv3D/include/Siv3D/MultiPolygon.hpp
@@ -411,6 +411,12 @@ namespace s3d
 
 		MultiPolygon& scaleAt(Vec2 pos, Vec2 s);
 
+		[[nodiscard]]
+		double area() const noexcept;
+
+		[[nodiscard]]
+		double perimeter() const noexcept;
+
 		[[nodiscard]]
 		RectF computeBoundingRect() const noexcept;
 

diff --git a/Siv3D/src/Siv3D/MultiPolygon/SivMultiPolygon.cpp b/Siv3D/src/Siv3D/MultiPolygon/SivMultiPolygon.cpp
@@ -306,6 +306,30 @@ namespace s3d
 		return *this;
 	}
 
+	double MultiPolygon::area() const noexcept
+	{
+		double total = 0.0;
+
+		for (const auto& polygon : m_data)
+		{
+			total += polygon.area();
+		}
+
+		return total;
+	}
+
+	double MultiPolygon::perimeter() const noexcept
+	{
+		double total = 0.0;
+
+		for (const auto& polygon : m_data)
+		{
+			total += polygon.perimeter();
+		}
+
+		return total;
+	}
+
 	RectF MultiPolygon::computeBoundingRect() const noexcept
 	{
 		if (isEmpty())