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2b961414d7
In order not to waste CPU by constantly rerendering the chart, we must use these weird OpenGL QSGNode things. The interface is appallingly low-level and unfriendly. As a first test, try to convert the legend. Create a wrapper class that represents a rectangular item with a texture and that will certainly need some (lots of) optimization. Make sure that all low-level QSG-objects are only accessed in the rendering thread. This means that the wrapper has to maintain a notion of "dirtiness" of the state. I.e. which part of the QSG-objects have to be modified. From the low-level wrapper derive a class that draws a rounded rectangle for every resize. The child class of that must then paint on the rectangle after every resize. That looks all not very fortunate, but it displays a legend and will make it possible to move the legend without and drawing operations, only shifting around an OpenGL surface. The render thread goes through all chart-items and rerenders them if dirty. Currently, on deletion of these items, this list is not reset. I.e. currently it is not supported to remove individual items. Only the full scene can be cleared! Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
37 lines
787 B
C++
37 lines
787 B
C++
// SPDX-License-Identifier: GPL-2.0
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// A legend box, which is shown on the chart.
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#ifndef STATS_LEGEND_H
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#define STATS_LEGEND_H
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#include "chartitem.h"
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#include <memory>
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#include <vector>
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#include <QFont>
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class QFontMetrics;
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class Legend : public ChartRectItem {
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public:
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Legend(StatsView &view, const std::vector<QString> &names);
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void hover(QPointF pos);
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void resize(); // called when the chart size changes.
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private:
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// Each entry is a text besides a rectangle showing the color
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struct Entry {
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QString name;
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QBrush rectBrush;
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QPointF pos;
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double width;
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Entry(const QString &name, int idx, int numBins, const QFontMetrics &fm);
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};
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int displayedItems;
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double width;
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double height;
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QFont font;
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int fontHeight;
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std::vector<Entry> entries;
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void hide();
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};
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#endif
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