statistics: draw legend as a QSGNode

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>

1 files changed, 12 insertions, 0 deletions

diff --git a/stats/statsview.h b/stats/statsview.h
index b1e178565..385a591f4 100644
--- a/stats/statsview.h
+++ b/stats/statsview.h
@@ -19,8 +19,10 @@ struct StatsVariable;
 
 class QGraphicsLineItem;
 class QGraphicsSimpleTextItem;
+class QSGImageNode;
 class StatsSeries;
 class CategoryAxis;
+class ChartItem;
 class CountAxis;
 class HistogramAxis;
 class StatsAxis;
@@ -46,6 +48,10 @@ public:
 	~StatsView();
 
 	void plot(const StatsState &state);
+	QQuickWindow *w() const;		// Make window available to items
+	QSizeF size() const;
+	void addQSGNode(QSGNode *node, int z);	// Must only be called in render thread!
+	void unregisterChartItem(const ChartItem *item);
 private slots:
 	void replotIfVisible();
 private:
@@ -103,6 +109,9 @@ private:
 	template <typename T, class... Args>
 	T *createAxis(const QString &title, Args&&... args);
 
+	template <typename T, class... Args>
+	std::unique_ptr<T> createChartItem(Args&&... args);
+
 	template<typename T>
 	CategoryAxis *createCategoryAxis(const QString &title, const StatsBinner &binner,
 					 const std::vector<T> &bins, bool isHorizontal);
@@ -156,11 +165,14 @@ private:
 	std::vector<RegressionLine> regressionLines;
 	std::vector<HistogramMarker> histogramMarkers;
 	std::unique_ptr<QGraphicsSimpleTextItem> title;
+	std::vector<ChartItem *> items; // Attention: currently, items are not automatically removed on destruction!
 	StatsSeries *highlightedSeries;
 	StatsAxis *xAxis, *yAxis;
 
 	void hoverEnterEvent(QHoverEvent *event) override;
 	void hoverMoveEvent(QHoverEvent *event) override;
+
+	QSGImageNode *rootNode;
 };
 
 #endif