File indexing completed on 2024-04-28 07:45:36

 /*
  * This file is part of KQuickCharts
  * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
  * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #ifndef LINECHART_H
 #define LINECHART_H
 
 #include <memory>
 
 #include <qqmlregistration.h>
 
 #include "XYChart.h"
 
 class LineChartNode;
 
 /**
  * An attached property that is exposed to point delegates created in line charts.
  *
  * \sa LineChart::pointDelegate
  */
 class LineChartAttached : public QObject
 {
     Q_OBJECT
     QML_ANONYMOUS
 
 public:
     LineChartAttached(QObject *parent = nullptr);
 
     /**
      * The value at the current point.
      */
     Q_PROPERTY(QVariant value READ value NOTIFY valueChanged)
     QVariant value() const;
     void setValue(const QVariant &value);
     Q_SIGNAL void valueChanged();
 
     /**
      * The color at the current point.
      */
     Q_PROPERTY(QColor color READ color NOTIFY colorChanged)
     QColor color() const;
     void setColor(const QColor &color);
     Q_SIGNAL void colorChanged();
 
     /**
      * The name at the current point.
      */
     Q_PROPERTY(QString name READ name NOTIFY nameChanged)
     QString name() const;
     void setName(const QString &newName);
     Q_SIGNAL void nameChanged();
 
     /**
      * The short name at the current point.
      */
     Q_PROPERTY(QString shortName READ shortName NOTIFY shortNameChanged)
     QString shortName() const;
     void setShortName(const QString &newShortName);
     Q_SIGNAL void shortNameChanged();
 
 private:
     QVariant m_value;
     QColor m_color;
     QString m_name;
     QString m_shortName;
 };
 
 /**
  * A line chart.
  *
  * ## Usage example
  *
  * \snippet snippets/linechart.qml example
  *
  * \image html linechart.png "The resulting line chart."
  */
 class QUICKCHARTS_EXPORT LineChart : public XYChart
 {
     Q_OBJECT
     QML_ELEMENT
     QML_ATTACHED(LineChartAttached)
 
 public:
     explicit LineChart(QQuickItem *parent = nullptr);
 
     /**
      * Interpolate the values in the chart so that the lines become smoothed.
      */
     Q_PROPERTY(bool interpolate READ interpolate WRITE setInterpolate NOTIFY interpolateChanged)
     bool interpolate() const;
     void setInterpolate(bool newInterpolate);
     Q_SIGNAL void interpolateChanged();
     /**
      * The width of a line in the chart.
      */
     Q_PROPERTY(qreal lineWidth READ lineWidth WRITE setLineWidth NOTIFY lineWidthChanged)
     qreal lineWidth() const;
     void setLineWidth(qreal width);
     Q_SIGNAL void lineWidthChanged();
     /**
      * The opacity of the area below a line.
      *
      * The default is 0.0. Note that if fillColorSource is set, this value is
      * ignored.
      */
     Q_PROPERTY(qreal fillOpacity READ fillOpacity WRITE setFillOpacity NOTIFY fillOpacityChanged)
     qreal fillOpacity() const;
     void setFillOpacity(qreal opacity);
     Q_SIGNAL void fillOpacityChanged();
     /**
      * A data source that supplies color values for the line charts' fill area.
      *
      * If this is not set (the default), the normal color source will be used,
      * with the fillOpacity used as its opacity.
      */
     Q_PROPERTY(ChartDataSource *fillColorSource READ fillColorSource WRITE setFillColorSource NOTIFY fillColorSourceChanged)
     ChartDataSource *fillColorSource() const;
     void setFillColorSource(ChartDataSource *newFillColorSource);
     Q_SIGNAL void fillColorSourceChanged();
     /**
      * A delegate that will be placed at each line chart point.
      *
      * When this is not null, the specified component will be used to
      * instantiate an object for each point in the chart. These objects will
      * then be placed centered at positions corresponding to the points on the
      * chart. Each instance will have access to the attached properties of
      * LineChartAttached through LineChart attached object.
      *
      * \note The component assigned to this property is expected to create a
      *       QQuickItem, since the created object needs to be positioned.
      */
     Q_PROPERTY(QQmlComponent *pointDelegate READ pointDelegate WRITE setPointDelegate NOTIFY pointDelegateChanged)
     QQmlComponent *pointDelegate() const;
     void setPointDelegate(QQmlComponent *newPointDelegate);
     Q_SIGNAL void pointDelegateChanged();
 
     static LineChartAttached *qmlAttachedProperties(QObject *object)
     {
         return new LineChartAttached(object);
     }
 
 protected:
     void updatePolish() override;
     QSGNode *updatePaintNode(QSGNode *node, QQuickItem::UpdatePaintNodeData *data) override;
     void onDataChanged() override;
     void geometryChange(const QRectF &newGeometry, const QRectF &oldGeometry) override;
 
 private:
     void updateLineNode(LineChartNode *node, const QColor &lineColor, const QColor &fillColor, ChartDataSource *valueSource);
     void createPointDelegates(const QList<QVector2D> &values, int sourceIndex);
     void updatePointDelegate(QQuickItem *delegate, const QVector2D &position, const QVariant &value, int sourceIndex);
 
     bool m_interpolate = false;
     qreal m_lineWidth = 1.0;
     qreal m_fillOpacity = 0.0;
     bool m_rangeInvalid = true;
     ChartDataSource *m_fillColorSource = nullptr;
     QHash<ChartDataSource *, QList<QVector2D>> m_values;
     QQmlComponent *m_pointDelegate = nullptr;
     QHash<ChartDataSource *, QList<QQuickItem *>> m_pointDelegates;
 };
 
 #endif // LINECHART_H