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// 不去重但保持原始顺序 std::vector<QPointF> removeDuplicates3b(const std::vector<QPointF>& points) { std::vector<QPointF> result; for (const auto& p : points) { auto it = std::find_if(result.begin(), result.end(), [&p](const QPointF& existing) { return qFuzzyCompare(p.x(), existing.x()) && qFuzzyCompare(p.y(), existing.y()); }); if (it == result.end()) { result.push_back(p); } } return result; }