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238 lines
12 KiB
C++
238 lines
12 KiB
C++
/*
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Copyright (c) 2020-2020 Jan W. Krieger (<jan@jkrieger.de>)
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This software is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef JKQTPGEOMETRYTOOLS_H_INCLUDED
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#define JKQTPGEOMETRYTOOLS_H_INCLUDED
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#include "jkqtcommon/jkqtcommon_imexport.h"
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#include <QPolygonF>
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#include <QPolygon>
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#include <QRectF>
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#include <QRect>
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#include <QLineF>
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#include <QLine>
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#include <QPainterPath>
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#include <QVector>
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#include <vector>
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#include <forward_list>
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#include <cmath>
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#include <utility>
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#include <QDebug>
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#include "jkqtcommon/jkqtpmathtools.h"
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#include "jkqtcommon/jkqtpcodestructuring.h"
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/** \brief rotate a rectangle by given angle (rotates all points around the center of the rectangle and returns it as a QPolygonF)
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* \ingroup jkqtptools_drawing
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*/
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JKQTCOMMON_LIB_EXPORT QPolygonF jkqtpRotateRect(QRectF r, double angle);
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/** \brief adaptive drawing of a function graph, specified by two function \f$ f_x(t) \f$ and \f$ f_y(t) \f$ evaluated over a parameter range \f$ t\in\left[t_\text{min}..t_\text{max}\tight] \f$ */
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class JKQTCOMMON_LIB_EXPORT JKQTPAdaptiveFunctionGraphEvaluator {
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public:
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/** \brief class constructor
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*
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* \param fx function \f$ f_x(t) \f$
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* \param fy function \f$ f_y(t) \f$
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* \param minSamples the minimum number of points to evaluate the function at
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* \param maxRefinementDegree the maximum number of recursive refinement steps
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* each step bisects the interval \f$ [a, b] \f$ into two halfes. So the maximum number
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* of points plotted at all are thus:
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* \f[ \mbox{minSamples} \cdot 2^{\mbox{maxRefinementDegree}} \f]
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* \param slopeTolerance the tolerance for the difference of two subsequent slopes
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* \param minPixelPerSample create one sample at least every \a minPixelPerSample pixels
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*/
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JKQTPAdaptiveFunctionGraphEvaluator(const std::function<double(double)>& fx_, const std::function<double(double)>& fy_, unsigned int minSamples_=10, unsigned int maxRefinementDegree_=5, double slopeTolerance_=0.005, double minPixelPerSample_=32);
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/** \brief class constructor
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*
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* \param fxy function \f$ [x,y]=f_{xy}(t) \f$
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* \param minSamples the minimum number of points to evaluate the function at
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* \param maxRefinementDegree the maximum number of recursive refinement steps
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* each step bisects the interval \f$ [a, b] \f$ into two halfes. So the maximum number
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* of points plotted at all are thus:
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* \f[ \mbox{minSamples} \cdot 2^{\mbox{maxRefinementDegree}} \f]
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* \param slopeTolerance the tolerance for the difference of two subsequent slopes
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* \param minPixelPerSample create one sample at least every \a minPixelPerSample pixels
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*/
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JKQTPAdaptiveFunctionGraphEvaluator(const std::function<QPointF(double)>& fxy_, unsigned int minSamples_=10, unsigned int maxRefinementDegree_=5, double slopeTolerance_=0.005, double minPixelPerSample_=32);
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/** \brief evaluate the function specified in the constructor over the given parameter range \a tmin ... \a tmax
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*
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* \param tmin lower parameter range limit \f$ t_\text{min} \f$
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* \param tmax upper parameter range limit \f$ t_\text{max} \f$
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*/
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QVector<QPointF> evaluate(double tmin=0.0, double tmax=1.0) const;
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protected:
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typedef std::forward_list<std::pair<double, QPointF>> InternalList;
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/** \brief refine (if necessary) the function graph between the two points \a a and \a b, working on the given list of data \a data */
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void refine(InternalList& data, InternalList::iterator a, InternalList::iterator b, unsigned int degree) const;
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/** \brief function \f$ f_x(t) \f$ */
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std::function<double(double)> fx;
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/** \brief function \f$ f_y(t) \f$ */
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std::function<double(double)> fy;
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/** \brief function \f$ [x,y]=f_{xy}(t) \f$ */
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std::function<QPointF(double)> fxy;
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/** \brief the minimum number of points to evaluate the function at */
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unsigned int minSamples;
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/** \brief the maximum number of recursive refinement steps
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*
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* each step bisects the interval \f$ [a, b] \f$ into two halfes. So the maximum number
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* of points plotted at all are thus:
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* \f[ \mbox{minSamples} \cdot 2^{\mbox{maxRefinementDegree}} \f]
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*/
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unsigned int maxRefinementDegree;
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/** \brief the tolerance for the difference of two subsequent slopes */
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double slopeTolerance;
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/** \brief create one sample at least every \a minPixelPerSample pixels */
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double minPixelPerSample;
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};
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/*! \brief represent an ellipse as a series of points on the ellipse
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\ingroup jkqtptools_drawing
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\return a QVector<QPointF> with points that may be used for drawing
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\param x center of ellipse (x-coordinate)
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\param y center of ellipse (y-coordinate)
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\param a half axis in x-direction
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\param b half axis in y-direction
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\param angle_start starting angle of ellipse section
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\param angle_end ending angle of ellipse section
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\param alpha rotation angle of ellipse
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\param controlPoints the number of points to use for drawing
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\param[out] x_start first point of ellipse
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\param[out] x_end last point of ellipse
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\note all angles are given in degrees [0..360]
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*/
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JKQTCOMMON_LIB_EXPORT QVector<QPointF> JKQTPSplitEllipseIntoPoints(double x, double y, double a, double b, double angle_start=0, double angle_end=360, double alpha=0, int controlPoints=180, QPointF* x_start=nullptr, QPointF* x_end=nullptr);
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/*! \brief represent an ellipse as a series of points on the ellipse
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\ingroup jkqtptools_drawing
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\return a QVector<QPointF> with points that may be used for drawing
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\param fTransform a function that transforms a point in graph coordinate space into pixel coordinate space
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\param x center of ellipse (x-coordinate)
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\param y center of ellipse (y-coordinate)
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\param a half axis in x-direction
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\param b half axis in y-direction
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\param angle_start starting angle of ellipse section
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\param angle_end ending angle of ellipse section
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\param alpha rotation angle of ellipse
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\param[out] x_start first point of ellipse, with fTransform applied
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\param[out] x_end last point of ellipse, with fTransform applied
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\param[out] x_start_notrafo first point of ellipse, without fTransform applied
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\param[out] x_end_notrafo last point of ellipse, without fTransform applied
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\note all angles are given in degrees [0..360]
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*/
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JKQTCOMMON_LIB_EXPORT QVector<QPointF> JKQTPSplitEllipseIntoPoints(std::function<QPointF(QPointF)> fTransform, double x, double y, double a, double b, double angle_start=0, double angle_end=360, double alpha=0, QPointF* x_start=nullptr, QPointF* x_end=nullptr, QPointF* x_start_notrafo=nullptr, QPointF* x_end_notrafo=nullptr);
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/*! \brief represent a line as a series of points on the ellipse
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\ingroup jkqtptools_drawing
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\return a QVector<QPointF> with points that may be used for drawing
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\param line the line to draw
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\param controlPoints the number of points to use for drawing
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*/
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JKQTCOMMON_LIB_EXPORT QVector<QPointF> JKQTPSplitLineIntoPoints(const QLineF& line, int controlPoints=180);
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/*! \brief represent a line as a series of points on the ellipse
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\ingroup jkqtptools_drawing
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\return a QVector<QPointF> with points that may be used for drawing
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\param line the line to draw in graph coordinate space
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\param fTransform a function that transforms a point in graph coordinate space into pixel coordinate space
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*/
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JKQTCOMMON_LIB_EXPORT QVector<QPointF> JKQTPSplitLineIntoPoints(const QLineF& line, std::function<QPointF(QPointF)> fTransform);
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/*! \brief represent a poly-line as a series of points on the ellipse
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\ingroup jkqtptools_drawing
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\return a QVector<QPointF> with points that may be used for drawing
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\param line the poly-line to draw in graph coordinate space
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\param fTransform a function that transforms a point in graph coordinate space into pixel coordinate space
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*/
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JKQTCOMMON_LIB_EXPORT QVector<QPointF> JKQTPSplitPolylineIntoPoints(const QVector<QPointF>& line, std::function<QPointF(QPointF)> fTransform);
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/*! \brief takes a list of points and tries to reduce them. Three points are merged to two, if they form a straight line
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\ingroup jkqtptools_drawing
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\return a cleaned QVector<QPointF>
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\param points input poly-line
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\param maxConsecutiveAngleDegree is two consecutive line-segments differ by an angle smaller than this, they can be merged
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\note this implements an incomplete algorithm
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*/
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JKQTCOMMON_LIB_EXPORT QVector<QPointF> JKQTPSimplyfyLineSegemnts(const QVector<QPointF>& points, double maxConsecutiveAngleDegree=0.2);
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/** \brief cleans a polygon by uniting all consecutive points that were closer than distanceThreshold are united
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* \ingroup jkqtptools_drawing
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*
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* \param poly polygon to clean
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* \param distanceThreshold if two end-points are closer together as this value, they are united to a single point
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* \return a cleaned polygon, where all consecutive points that were closer than distanceThreshold are united
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*/
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JKQTCOMMON_LIB_EXPORT QPolygonF JKQTPCleanPolygon(const QPolygonF& poly, double distanceThreshold=0.3);
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/** \brief takes a list of QLineF objesct \a lines and tries to combine as many of them as possible to QPolygonF objects.
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* <b>Note: This method implements an incomplete algorithm with \a searchMaxSurroundingElements>0, as solving
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* the complete problem is very time-consuming (cubic runtime)</b>
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* \ingroup jkqtptools_drawing
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*
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* \param lines line segments to unify
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* \param distanceThreshold if two end-points are closer together as this value, they are united to a single point
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* \param searchMaxSurroundingElements limits the search for a connected polygon to at most this number of neighbors
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* \return a vector of QPolygonF objects, which contain longer line-segments formed from \a lines
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*/
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JKQTCOMMON_LIB_EXPORT QVector<QPolygonF> JKQTPUnifyLinesToPolygons(const QVector<QLineF>& lines, double distanceThreshold=0.3, int searchMaxSurroundingElements=10);
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/** \brief clip a QLineF \a line to the rectangle defines by \a clippingRect
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* \ingroup jkqtptools_drawing
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*
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* \param[in,out] line The line to clip, if clipping is possible this is modified to the clipped line.
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* If the line is outside \a clippingRect this is modified to \c line=QLineF() i.e. a null-line!
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* \param clippingRect the rectangle to clip to
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* \return \c true, if the line had at least some points within \a clippingRect, \c false otherwise.
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* The clipped line (or a null-line) is returned in the by-refrence parameter \a line
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*
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* \see This function uses the Linag-Barsky-Algorithm: https://en.wikipedia.org/wiki/Liang%E2%80%93Barsky_algorithm https://www.skytopia.com/project/articles/compsci/clipping.html
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*/
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JKQTCOMMON_LIB_EXPORT bool JKQTPClipLine(QLineF& line, const QRectF& clippingRect);
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#endif // JKQTPGEOMETRYTOOLS_H_INCLUDED
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