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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>
53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
// SPDX-License-Identifier: GPL-2.0
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// Wrappers around QSGImageNode that allow painting onto an image
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// and then turning that into a texture to be displayed in a QQuickItem.
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#ifndef CHART_ITEM_H
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#define CHART_ITEM_H
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#include <memory>
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#include <QPainter>
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class QSGImageNode;
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class QSGTexture;
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class StatsView;
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enum class ChartZValue : int;
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class ChartItem {
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public:
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ChartItem(StatsView &v, ChartZValue z);
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~ChartItem();
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// Attention: The children are responsible for updating the item. None of these calls will.
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void resize(QSizeF size); // Resets the canvas. Attention: image is *unitialized*.
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void setPos(QPointF pos);
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void render(); // Only call on render thread!
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QRectF getRect() const;
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bool dirty; // If true, call render() when rebuilding the scene
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const ChartZValue zValue;
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protected:
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std::unique_ptr<QPainter> painter;
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std::unique_ptr<QImage> img;
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QSizeF sceneSize() const;
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void setTextureDirty();
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void setPositionDirty();
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private:
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StatsView &view;
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QRectF rect;
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bool positionDirty;
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bool textureDirty;
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std::unique_ptr<QSGImageNode> node;
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std::unique_ptr<QSGTexture> texture;
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};
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// Draw a rectangular background after resize. Children are responsible for calling update().
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class ChartRectItem : public ChartItem {
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public:
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ChartRectItem(StatsView &v, ChartZValue z, const QPen &pen, const QBrush &brush, double radius);
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~ChartRectItem();
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void resize(QSizeF size);
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private:
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QPen pen;
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QBrush brush;
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double radius;
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};
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#endif
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