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statistics: implement a box-and-whisker series

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Implements a simple box-and-whisker series to display
quartile based data. When hovering over a box-and-whiskers
item the precise data of the quartiles is shown.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2021-01-01 22:23:29 +01:00 • committed by Dirk Hohndel
parent ca572acb0d
commit b0bdef469e
3 changed files with 228 additions and 0 deletions
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// SPDX-License-Identifier: GPL-2.0
// A small custom box plot series, which displays quartiles.
// The QtCharts bar series were too inflexible with respect
// to placement of the bars.
#ifndef BOX_SERIES_H
#define BOX_SERIES_H
#include "statsseries.h"
#include "statsvariables.h" // for StatsQuartiles
#include <memory>
#include <vector>
#include <QGraphicsLineItem>
#include <QGraphicsRectItem>
class InformationBox;
class BoxSeries : public StatsSeries {
public:
BoxSeries(QtCharts::QChart *chart, StatsAxis *xAxis, StatsAxis *yAxis,
const QString &variable, const QString &unit, int decimals);
~BoxSeries();
void updatePositions() override;
bool hover(QPointF pos) override;
void unhighlight() override;
// Note: this expects that all items are added with increasing pos
// and that no bar is inside another bar, i.e. lowerBound and upperBound
// are ordered identically.
void append(double lowerBound, double upperBound, const StatsQuartiles &q, const QString &binName);
private:
// Get item under mouse pointer, or -1 if none
int getItemUnderMouse(const QPointF &f);
struct Item {
QGraphicsRectItem box;
QGraphicsLineItem topWhisker, bottomWhisker;
QGraphicsLineItem topBar, bottomBar;
QGraphicsLineItem center;
QRectF bounding; // bounding box in screen coordinates
~Item();
double lowerBound, upperBound;
StatsQuartiles q;
QString binName;
Item(QtCharts::QChart *chart, BoxSeries *series, double lowerBound, double upperBound, const StatsQuartiles &q, const QString &binName);
void updatePosition(QtCharts::QChart *chart, BoxSeries *series);
void highlight(bool highlight);
};
QString variable, unit;
int decimals;
std::vector<QString> formatInformation(const Item &item) const;
std::unique_ptr<InformationBox> information;
std::vector<std::unique_ptr<Item>> items;
int highlighted; // -1: no item highlighted
};
#endif