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vrld
117 lines
2.7 KiB
C++
117 lines
2.7 KiB
C++
/**
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* Copyright (c) 2006-2013 LOVE Development Team
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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**/
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#ifndef LOVE_MATH_BEZIER_CURVE_H
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#define LOVE_MATH_BEZIER_CURVE_H
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// LOVE
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#include "common/Object.h"
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#include "common/Vector.h"
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#include <vector>
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namespace love
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{
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namespace math
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{
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class BezierCurve : public Object
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{
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public:
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/**
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* @param controlPoints Control polygon of the curve.
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**/
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BezierCurve(const std::vector<Vector> &controlPoints);
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/**
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* @returns Degree of the curve
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**/
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size_t getDegree() const
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{
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return controlPoints.size() - 1;
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}
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/**
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* @returns First derivative of the curve.
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*/
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BezierCurve getDerivative() const;
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/**
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* @returns i'th control point.
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**/
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const Vector &getControlPoint(int i) const;
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/**
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* Sets the i'th control point.
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* @param i Control point to change.
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* @param point New control point.
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**/
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void setControlPoint(int i, const Vector &point);
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/**
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* Insert a new control point before the i'th control point.
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* If i < 0, Lua string indexing rules apply.
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* @param point Control point to insert.
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* @param pos Position to insert.
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**/
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void insertControlPoint(const Vector &point, int pos = -1);
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/**
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* Move the curve.
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* @param t Translation vector.
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*/
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void translate(const Vector &t);
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/**
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* Rotate the curve.
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* @param phi Rotation angle (radians).
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* @param center Rotation center.
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*/
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void rotate(double phi, const Vector ¢er);
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/**
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* Scale the curve.
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* @param s Scale factor.
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* @param center Scale center.
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*/
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void scale(double phi, const Vector ¢er);
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/**
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* Evaluates the curve at time t.
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* @param t Curve parameter, must satisfy 0 <= t <= 1.
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**/
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Vector eval(double t) const;
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/**
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* Renders the curve by subdivision.
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* @param accuracy The 'fineness' of the curve.
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* @returns A polygon chain that approximates the bezier curve.
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**/
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std::vector<Vector> render(size_t accuracy = 4) const;
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private:
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std::vector<Vector> controlPoints;
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};
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}
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}
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#endif
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