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statistics: replace PieSeries by QSG nodes

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Since there are no disk-segment QSG primitives (one could draw
a triangle fan, but that doesn't seem optimal), this draws
into a pixmap and blits that as a QSG node.

Since this is the only series without axis, it needs a function
that returns the size of the plot area. This didn't exist, so
add it.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2021-01-18 12:08:46 +01:00 • committed by bstoeger
parent b07a7fe5f1
commit b068b2b0e7
6 changed files with 92 additions and 50 deletions
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16
stats/pieseries.h
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@ -10,9 +10,9 @@
#include <QString>
struct InformationBox;
class QGraphicsEllipseItem;
struct ChartPieItem;
struct ChartTextItem;
class QGraphicsScene;
class QGraphicsSimpleTextItem;
class QRectF;
class PieSeries : public StatsSeries {
@ -34,20 +34,20 @@ private:
// Get item under mouse pointer, or -1 if none
int getItemUnderMouse(const QPointF &f) const;
std::unique_ptr<ChartPieItem> item;
QString categoryName;
std::vector<QString> makeInfo(int idx) const;
struct Item {
std::unique_ptr<QGraphicsEllipseItem> item;
std::unique_ptr<QGraphicsSimpleTextItem> innerLabel, outerLabel;
std::unique_ptr<ChartTextItem> innerLabel, outerLabel;
QString name;
double angleTo; // In fraction of total
double angleFrom, angleTo; // In fraction of total
int count;
QPointF innerLabelPos, outerLabelPos; // With respect to a (-1, -1)-(1, 1) rectangle.
Item(QGraphicsScene *scene, const QString &name, int from, int count, int totalCount,
Item(StatsView &view, const QString &name, int from, int count, int totalCount,
int bin_nr, int numBins, bool labels);
void updatePositions(const QRectF &rect, const QPointF &center, double radius);
void highlight(int bin_nr, bool highlight, int numBins);
void updatePositions(const QPointF &center, double radius);
void highlight(ChartPieItem &item, int bin_nr, bool highlight, int numBins);
};
std::vector<Item> items;
int totalCount;