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statistics: add notion of Z-value to chart items

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The chart items were drawn in order of creation. To control this,
add a notion of Z-value. In contrast to QGraphicsScene, make
this a small integer value.

To controll order of drawing, a plain QSGNode is created for
every possible Z-Value and items are added to these nodes.
Thus, items are rendered by Z-value and if the Z-value is equal
by order of creation.

Likewise split the list of chart-items into Z-values, so that
items can be quickly unregistered: The items that will be
removed individually will usuall be part of Z-levels with only
few items (e.g. legend, infobox). Z-levels with many items
(notably the series) will always be fully rebuilt.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2021-01-13 16:19:27 +01:00 • committed by bstoeger
parent 785d5189f6
commit e1c0cace95
7 changed files with 82 additions and 31 deletions
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6
stats/chartitem.h
View file

@ -10,10 +10,11 @@
class QSGImageNode;
class QSGTexture;
class StatsView;
enum class ChartZValue : int;
class ChartItem {
public:
ChartItem(StatsView &v);
ChartItem(StatsView &v, ChartZValue z);
~ChartItem();
// Attention: The children are responsible for updating the item. None of these calls will.
void resize(QSizeF size); // Resets the canvas. Attention: image is *unitialized*.
@ -21,6 +22,7 @@ public:
void render(); // Only call on render thread!
QRectF getRect() const;
bool dirty; // If true, call render() when rebuilding the scene
const ChartZValue zValue;
protected:
std::unique_ptr<QPainter> painter;
std::unique_ptr<QImage> img;
@ -39,7 +41,7 @@ private:
// Draw a rectangular background after resize. Children are responsible for calling update().
class ChartRectItem : public ChartItem {
public:
ChartRectItem(StatsView &v, const QPen &pen, const QBrush &brush, double radius);
ChartRectItem(StatsView &v, ChartZValue z, const QPen &pen, const QBrush &brush, double radius);
~ChartRectItem();
void resize(QSizeF size);
private: