ViewDesignEngine/include/vde/foundation/tolerance.h

#pragma once
#include <Eigen/Core>
#include <cmath>
#include <limits>

namespace vde::foundation {

class Tolerance {
public:
    Tolerance(double absolute = 1e-6, double relative = 1e-8,
              double angular = 1e-8, double snapping = 1e-4)
        : absolute_(absolute), relative_(relative),
          angular_(angular), snapping_(snapping) {}

    bool points_equal(const Eigen::MatrixXd& a, const Eigen::MatrixXd& b) const {
        return (a - b).norm() < absolute_;
    }

    template <typename T>
    bool is_zero(T value) const {
        return std::abs(value) < absolute_;
    }

    template <typename T>
    bool equals(T a, T b) const {
        return std::abs(a - b) < absolute_ + relative_ * std::max(std::abs(a), std::abs(b));
    }

    double absolute() const { return absolute_; }
    double relative() const { return relative_; }
    double angular()  const { return angular_; }
    double snapping() const { return snapping_; }

    void set_absolute(double v) { absolute_ = v; }
    void set_relative(double v) { relative_ = v; }

    static Tolerance& global() { return global_; }
    static void set_global(const Tolerance& tol) { global_ = tol; }

private:
    double absolute_;
    double relative_;
    double angular_;
    double snapping_;
    static Tolerance global_;
};

}  // namespace vde::foundation