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MultiPolygon::centroid()の実装(#1186) #1190

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merged 3 commits into from
Jan 29, 2024
Merged

MultiPolygon::centroid()の実装(#1186) #1190

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ca10540
MultiPolygon::centroid()の実装(#1186)
Ogame3334 Jan 18, 2024
21b54fe
空の場合に(0, 0)を返すように&constを使用
Ogame3334 Jan 27, 2024
2532a12
fix style
Reputeless Jan 29, 2024
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3 changes: 3 additions & 0 deletions Siv3D/include/Siv3D/MultiPolygon.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -417,6 +417,9 @@ namespace s3d
[[nodiscard]]
double perimeter() const noexcept;

[[nodiscard]]
Vec2 centroid() const;

[[nodiscard]]
RectF computeBoundingRect() const noexcept;

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20 changes: 20 additions & 0 deletions Siv3D/src/Siv3D/MultiPolygon/SivMultiPolygon.cpp
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Expand Up @@ -330,6 +330,26 @@ namespace s3d
return total;
}

Vec2 MultiPolygon::centroid() const
{
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if (m_data.empty())
{
return Vec2{ 0, 0 };
}

Vec2 weightedCoordsTotal{ 0, 0 };
double areaTotal = 0.0;

for (const auto& polygon : m_data)
{
const double polygonArea = polygon.area();
weightedCoordsTotal += polygonArea * polygon.centroid();
areaTotal += polygonArea;
}

return weightedCoordsTotal / areaTotal;
}

RectF MultiPolygon::computeBoundingRect() const noexcept
{
if (isEmpty())
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