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// SPDX-License-Identifier: GPL-2.0
#ifndef STATS_AXIS_H
#define STATS_AXIS_H
#include "chartitem.h"
#include "statshelper.h"
#include <memory>
#include <vector>
#include <QFont>
class StatsView;
class ChartLineItem;
class QFontMetrics;
// The labels and the title of the axis are rendered into a pixmap.
// The ticks and the baseline are realized as individual ChartLineItems.
class StatsAxis : public ChartPixmapItem {
public:
virtual ~StatsAxis();
// Returns minimum and maximum of shown range, not of data points.
std::pair<double, double> minMax() const;
std::pair<double, double> minMaxScreen() const; // minimum and maximum in screen coordinates
std::pair<double, double> horizontalOverhang() const; // space that labels peak out in horizontal axes
double width() const; // Only supported by vertical axes. Only valid after setSize().
double height() const; // Only supported for horizontal axes. Always valid.
void setSize(double size); // Width for horizontal and height for vertical.
void setPos(QPointF pos); // Must be called after setSize().
void setRange(double, double);
// Map x (horizontal) or y (vertical) coordinate to or from screen coordinate
double toScreen(double) const;
double toValue(double) const;
std::vector<double> ticksPositions() const; // Positions in screen coordinates
protected:
StatsAxis(StatsView &view, const QString &title, bool horizontal, bool labelsBetweenTicks);
ChartItemPtr<ChartLineItem> line;
QString title;
double titleWidth;
struct Label {
QString label;
int width;
double pos;
};
std::vector<Label> labels;
void addLabel(const QFontMetrics &fm, const QString &label, double pos);
virtual void updateLabels() = 0;
virtual std::pair<QString, QString> getFirstLastLabel() const = 0;
struct Tick {
ChartItemPtr<ChartLineItem> item;
double pos;
};
std::vector<Tick> ticks;
void addTick(double pos);
int guessNumTicks(const std::vector<QString> &strings) const;
bool horizontal;
bool labelsBetweenTicks; // When labels are between ticks, they can be moved closer to the axis
QFont labelFont, titleFont;
double size; // width for horizontal, height for vertical
double zeroOnScreen;
QPointF offset; // Offset of the label and title pixmap with respect to the (0,0) position.
double min, max;
double labelWidth; // Maximum width of labels
private:
double titleSpace() const; // Space needed for title
};
class ValueAxis : public StatsAxis {
public:
ValueAxis(StatsView &view, const QString &title, double min, double max, int decimals, bool horizontal);
private:
double min, max;
int decimals;
void updateLabels() override;
std::pair<QString, QString> getFirstLastLabel() const override;
};
class CountAxis : public ValueAxis {
public:
CountAxis(StatsView &view, const QString &title, int count, bool horizontal);
private:
int count;
void updateLabels() override;
std::pair<QString, QString> getFirstLastLabel() const override;
};
class CategoryAxis : public StatsAxis {
public:
CategoryAxis(StatsView &view, const QString &title, const std::vector<QString> &labels, bool horizontal);
private:
std::vector<QString> labelsText;
void updateLabels();
std::pair<QString, QString> getFirstLastLabel() const override;
};
struct HistogramAxisEntry {
QString name;
double value;
bool recommended;
};
class HistogramAxis : public StatsAxis {
public:
HistogramAxis(StatsView &view, const QString &title, std::vector<HistogramAxisEntry> bin_values, bool horizontal);
private:
void updateLabels() override;
std::pair<QString, QString> getFirstLastLabel() const override;
std::vector<HistogramAxisEntry> bin_values;
int preferred_step;
};
class DateAxis : public HistogramAxis {
public:
DateAxis(StatsView &view, const QString &title, double from, double to, bool horizontal);
};
#endif
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