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e7907c494f
It turns out that the wrong base class was used for the chart. QQuickWidget can only be used on desktop, not in a mobile UI. Therefore, turn this into a QQuickItem and move the container QQuickWidget into desktop-only code. Currently, this code is insane: The chart is rendered onto a QGraphicsScene (as it was before), which is then rendered into a QImage, which is transformed into a QSGTexture, which is then projected onto the device. This is performed on every mouse move event, since these events in general change the position of the info-box. The plan is to slowly convert elements such as the info-box into QQuickItems. Browsing the QtQuick documentation, this will not be much fun. Also note that the rendering currently tears, flickers and has antialiasing artifacts, most likely owing to integer (QImage) to floating point (QGraphicsScene, QQuickItem) conversion problems. The data flow is QGraphicsScene (float) -> QImage (int) -> QQuickItem (float). Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
68 lines
2 KiB
C++
68 lines
2 KiB
C++
// SPDX-License-Identifier: GPL-2.0
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// A pie chart series, which displays percentual information.
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#ifndef PIE_SERIES_H
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#define PIE_SERIES_H
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#include "statsseries.h"
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#include <memory>
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#include <vector>
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#include <QString>
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class InformationBox;
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class QGraphicsEllipseItem;
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class QGraphicsScene;
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class QGraphicsSimpleTextItem;
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class QRectF;
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class PieSeries : public StatsSeries {
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public:
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// The pie series is initialized with (name, count) pairs.
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// If keepOrder is false, bins will be sorted by size, otherwise the sorting
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// of the shown bins will be retained. Small bins are omitted for clarity.
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PieSeries(QGraphicsScene *scene, StatsAxis *xAxis, StatsAxis *yAxis, const QString &categoryName,
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const std::vector<std::pair<QString, int>> &data, bool keepOrder, bool labels);
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~PieSeries();
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void updatePositions() override;
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bool hover(QPointF pos) override;
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void unhighlight() override;
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std::vector<QString> binNames();
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private:
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// Get item under mouse pointer, or -1 if none
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int getItemUnderMouse(const QPointF &f) const;
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QString categoryName;
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std::vector<QString> makeInfo(int idx) const;
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struct Item {
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std::unique_ptr<QGraphicsEllipseItem> item;
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std::unique_ptr<QGraphicsSimpleTextItem> innerLabel, outerLabel;
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QString name;
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double angleTo; // In fraction of total
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int count;
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QPointF innerLabelPos, outerLabelPos; // With respect to a (-1, -1)-(1, 1) rectangle.
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Item(QGraphicsScene *scene, const QString &name, int from, int count, int totalCount,
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int bin_nr, int numBins, bool labels);
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void updatePositions(const QRectF &rect, const QPointF ¢er, double radius);
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void highlight(int bin_nr, bool highlight, int numBins);
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};
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std::vector<Item> items;
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int totalCount;
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// Entries in the "other" group. If empty, there is no "other" group.
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struct OtherItem {
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QString name;
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int count;
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};
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std::vector<OtherItem> other;
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std::unique_ptr<InformationBox> information;
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QPointF center; // center of drawing area
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double radius; // radius of pie
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int highlighted;
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};
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#endif
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