51 lines
1.7 KiB
C++
51 lines
1.7 KiB
C++
//
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// This source code is property of the Computer Graphics and Visualization
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// chair of the TU Dresden. Do not distribute in modified or unmodified form!
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// Copyright (C) 2016 CGV TU Dresden - All Rights Reserved
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//
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/*************************************************************************
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A BSpline.
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This class uses the interface "abstract_curve" to define a bspline.
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Read the information in "abstract_curve.h" for more details.
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*************************************************************************/
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// provides the abstract curve interface
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#include "abstract_curve.h"
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class bspline: public abstract_curve
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{
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public:
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// Initialize the curve and store a reference of the control points.
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// Also the degree of the curve is provided through this constructor
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bspline(std::vector<point2d>& control_points, int degree);
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// The specified "evaluate_basis" to evaluate a basis function for
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// the control point "point_num" at the position "t"
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double evaluate_basis(int point_num, double t);
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// Another version of the evaluate_basis method with a specifyable
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// degree. This method can be used for the recursive evaluation of
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// the basis functions
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double evaluate_basis(int degree, int point_num, double t);
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// The specified "control_points_updated" to adjust the knot vector
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// when control points are added or removed
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void control_points_updated();
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// The specified "set_text" method to put arbitrary text into the
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// stream "stream"
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void set_text(std::stringstream &stream);
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private:
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// The degree of the spline
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int degree;
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// The knot vector (Knotenvektor)
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std::vector<double> u;
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// Calculate the knot vector. This method is called from
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// "control_points_updated"
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void calculate_knot_vector();
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}; |