LineSeries QML Type

Presents data in line graphs. More...

• List of all members, including inherited members
• LineSeries is part of Qt Graphs QML Types for 2D.

Properties

• capStyle : Qt::PenCapStyle
• joinStyle : Qt::PenJoinStyle (since 6.11)
• lineStyle : QLineSeries::LineStyle (since 6.11)
• pointDelegate : Component
• width : real

Signals

• capStyleChanged()
• joinStyleChanged(Qt::PenJoinStyle newJoinStyle) (since 6.11)
• lineStyleChanged(QLineSeries::LineStyle newLineStyle) (since 6.11)
• widthChanged()

Methods

• dataPointCoordinatesAt(real x, real y)

Detailed Description

A line graph is used to show information as a series of data points connected by straight lines or steps.

Series can contain gaps using NaN values as in :

import QtGraphs

GraphsView {
    axisX: ValueAxis {
        max: 5
    }
    axisY: ValueAxis {
        max: 5
    }

    LineSeries {
        color: "#00ff00"
        joinStyle: Qt.RoundJoin

        XYPoint {
            x: 0.5
            y: 0.5
        }

        XYPoint {
            x: 1.1
            y: NaN
        }

        XYPoint {
            x: 1.9
            y: 3.3
        }

        XYPoint {
            x: 2.1
            y: 2.1
        }

        XYPoint {
            x: 5
            y: 4.9
        }
    }
}

or

QLineSeries *series = new QLineSeries();
series->append(0, 2);
series->append(2, 4);
series->append(3, std::numeric_limits<qreal>::quiet_NaN());
series->append(4, 1);
series->append(5, 0);
series->setLineStyle(QLineSeries::LineStyle::StepCenter);
series->setColor(Qt::red);

which result in :

LineSeries uses mostly the same API as ScatterSeries so see ScatterSeries documentation for further usage examples.

See also ScatterSeries.

Property Documentation

capStyle : Qt::PenCapStyle

Controls the cap style of the line. Set to one of Qt.FlatCap, Qt.SquareCap or Qt.RoundCap. By default the cap style is Qt.SquareCap. Invalid values are automatically set to the default value.

See also Qt::PenCapStyle.

joinStyle : Qt::PenJoinStyle [since 6.11]

Controls the join style of the line. Set to one of Qt.BevelJoin, Qt.MiterJoin or Qt.RoundJoin. By default the join style is Qt.BevelJoin. Invalid values are automatically set to the default value.

This property was introduced in Qt 6.11.

See also Qt::PenJoinStyle.

lineStyle : QLineSeries::LineStyle [since 6.11]

Controls the line style of the line. Set to one of LineSeries.Straight, LineSeries.StepLeft, LineSeries.StepRight or LineSeries.StepCenter. By default the line style is LineSeries.Straight. Invalid values are automatically set to the default value.

This property was introduced in Qt 6.11.

See also QLineSeries::LineStyle.

pointDelegate : Component

Marks the point with the given QML component.

pointDelegate: Image {
    source: "images/happy_box.png"
}

width : real

The width of the line. By default, the width is 2.0. Widths lower than 0 are invalid and are automatically set to 0.

Signal Documentation

capStyleChanged()

This signal is emitted when the line series cap style changes.

[since 6.11] joinStyleChanged(Qt::PenJoinStyle newJoinStyle)

This signal is emitted when the line series cap style changes. The newJoinStyle parameter holds the new join style.

This signal was introduced in Qt 6.11.

[since 6.11] lineStyleChanged(QLineSeries::LineStyle newLineStyle)

This signal is emitted when the line series line style changes. The newLineStyle parameter holds the new line style.

This signal was introduced in Qt 6.11.

widthChanged()

This signal is emitted when the line series width changes.

Method Documentation

dataPointCoordinatesAt(real x, real y)

Returns x and y rendercoordinates converted into data point coordinates.