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smooth_curve_generator.h
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smooth_curve_generator.h
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/* -*- Mode: C++; indent-tabs-mode: nil; tab-width: 4 -*-
* -*- coding: utf-8 -*-
*
* Copyright (C) 2011 ~ 2018 Deepin, Inc.
* 2011 ~ 2018 Wang Yong
*
* Author: Wang Yong <wangyong@deepin.com>
* Maintainer: Wang Yong <wangyong@deepin.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef SMOOTHCURVEGENERATOR_H
#define SMOOTHCURVEGENERATOR_H
#include <QList>
#include <QPainterPath>
#include <QPointF>
class SmoothCurveGenerator {
public:
/**
* Generate smooth curve by pass in point list.
* @param points - point list
* @return - return QPainterPath of smooth surve.
*/
static QPainterPath generateSmoothCurve(const QList<QPointF> &points);
private:
/**
* Solves a tridiagonal system for one of coordinates (x or y)
* of first Bezier control points.
* @param result - Solution vector.
* @param rhs - Right hand side vector.
* @param n - Size of rhs.
*/
static void calculateFirstControlPoints(double * &result, const double *rhs, int n);
/**
* Calculate control points of the smooth curve using the given knots.
* @param knots - Points of the given curve.
* @param firstControlPoints - Store the generated first control points.
* @param secondControlPoints - Store the generated second control points.
*/
static void calculateControlPoints(const QList<QPointF> &knots,
QList<QPointF> *firstControlPoints,
QList<QPointF> *secondControlPoints);
};
#endif // SMOOTHCURVEGENERATOR_H