doc_src_qcustomseriescanvasrenderer.cpp

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// Copyright (C) 2026 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

// Qt-Security score:significant reason:default

#include <QtCore/qlist.h>

#include <QtCanvasPainter/qcanvaspainteritem.h>

#include <QtGraphs/qcustomseries.h>

#include <QtGraphs/qcustomseriescanvasrenderer.h>

//! [customseries]

class ExampleCustomSeries : public QCustomSeries

public:

    explicit ExampleCustomSeries(QObject *parent = nullptr)

        : QCustomSeries(parent)

{}

    struct CustomSeriesData

        qreal x = 0;

        qreal y = 0;

        qreal size = 0;

        QColor color;

};

    QList<CustomSeriesData> seriesData() const

        return m_seriesData;

private:

    QList<CustomSeriesData> m_seriesData;

};

//! [customseries]

//! [customseries_renderer]

class ExampleCustomSeriesRenderer : public QCustomSeriesCanvasRenderer

public:

    void synchronizeData(QCustomSeries *series, QCanvasPainterItem *item) override

        Q_UNUSED(item);

        const auto customSeries = static_cast<ExampleCustomSeries *>(series);

        m_renderData.reserve(customSeries->seriesData().size());

        for (const auto &i : customSeries->seriesData())

            m_renderData.push_back({QRectF(i.x, i.y, i.size, i.size), i.color});

    void canvasPaint(QCanvasPainter *p) override

        for (const auto &i : std::as_const(m_renderData)) {

            p->setFillStyle(i.color);

            p->fillRect(i.rect);

private:

    struct CustomSeriesRenderData

        QRectF rect;

        QColor color;

};

    QList<CustomSeriesRenderData> m_renderData;

};

//! [customseries_renderer]