ViewDesignEngine
8ae4b86e08
新增: - include/vde/foundation/exact_predicates_gmp.h: GMP 精确谓词 - orient_2d/3d, in_circle 完全精确（mpq_class 有理数） - 零舍入误差，任意精度 - include/vde/foundation/predicates.h: 统一谓词接口 - Predicates<T> 编译期选择后端 - VDE_USE_GMP=ON → GMP, OFF → 自适应 double - 便捷函数: orient(), in_circle() - cmake/FindGMP.cmake: GMP 查找模块 - CMake: -DVDE_USE_GMP=ON 启用 GMP 精确模式 - AdaptiveDouble 包装器: 统一后端接口 使用: cmake -DVDE_USE_GMP=ON .. # 完全精确模式
38 lines
1.3 KiB
C++
38 lines
1.3 KiB
C++
#pragma once
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#include "vde/foundation/math_types.h"
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namespace vde::foundation::exact {
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enum class Orientation { Clockwise, CounterClockwise, Collinear };
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enum class CircleTest { Inside, On, Outside };
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/// Adaptive-precision 2D orientation test (Shewchuk)
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Orientation orient_2d(const Point2D& a, const Point2D& b, const Point2D& c);
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/// Adaptive-precision 3D orientation test
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Orientation orient_3d(const Point3D& a, const Point3D& b,
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const Point3D& c, const Point3D& d);
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/// Adaptive-precision in-circle test
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CircleTest in_circle(const Point2D& a, const Point2D& b,
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const Point2D& c, const Point2D& d);
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} // namespace vde::foundation::exact
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/// Adaptive double-precision predicates (default backend)
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namespace vde::foundation {
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struct AdaptiveDouble {
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static exact::Orientation orient_2d(const Point2D& a, const Point2D& b, const Point2D& c) {
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return exact::orient_2d(a, b, c);
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}
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static exact::Orientation orient_3d(const Point3D& a, const Point3D& b,
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const Point3D& c, const Point3D& d) {
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return exact::orient_3d(a, b, c, d);
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}
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static exact::CircleTest in_circle(const Point2D& a, const Point2D& b,
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const Point2D& c, const Point2D& d) {
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return exact::in_circle(a, b, c, d);
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}
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};
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} // namespace vde::foundation
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