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78 lines
2.2 KiB
78 lines
2.2 KiB
3 years ago
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/**
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* The Curve class represents a non-uniform polynomial B-spline curve, while the
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* RationalCurve class represents a non-uniform rational B-spline (NURBS) curve.
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*
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* Use of this source code is governed by a BSD-style license that can be found in
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* the LICENSE file.
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*/
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#ifndef TINYNURBS_CURVE_H
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#define TINYNURBS_CURVE_H
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#include "glm/glm.hpp"
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#include <exception>
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#include <stdexcept>
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#include <vector>
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namespace tinynurbs
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{
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// Forward declaration
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template <typename T> struct RationalCurve;
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/**
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Struct for holding a polynomial B-spline curve
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@tparam T Data type of control points and knots (float or double)
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*/
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template <typename T> struct Curve
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{
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unsigned int degree;
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std::vector<T> knots;
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std::vector<glm::vec<3, T>> control_points;
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Curve() = default;
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Curve(const RationalCurve<T> &crv) : Curve(crv.degree, crv.knots, crv.control_points) {}
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Curve(unsigned int degree, const std::vector<T> &knots,
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const std::vector<glm::vec<3, T>> &control_points)
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: degree(degree), knots(knots), control_points(control_points)
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{
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}
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};
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/**
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Struct for holding a rational B-spline curve
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@tparam T Data type of control points and knots (float or double)
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*/
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template <typename T> struct RationalCurve
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{
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unsigned int degree;
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std::vector<T> knots;
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std::vector<glm::vec<3, T>> control_points;
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std::vector<T> weights;
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RationalCurve() = default;
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RationalCurve(const Curve<T> &crv)
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: RationalCurve(crv, std::vector<T>(crv.control_points.size(), 1.0))
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{
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}
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RationalCurve(const Curve<T> &crv, const std::vector<T> &weights)
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: RationalCurve(crv.degree, crv.knots, crv.control_points, weights)
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{
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}
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RationalCurve(unsigned int degree, const std::vector<T> &knots,
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const std::vector<glm::vec<3, T>> &control_points, const std::vector<T> weights)
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: degree(degree), knots(knots), control_points(control_points), weights(weights)
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{
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}
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};
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// Typedefs for ease of use
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typedef Curve<float> Curve3f;
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typedef Curve<double> Curve3d;
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typedef RationalCurve<float> RationalCurve3f;
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typedef RationalCurve<double> RationalCurve3d;
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} // namespace tinynurbs
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#endif // TINYNURBS_CURVE_H
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