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Diffstat (limited to 'examples/charts/legendmarkers/mainwidget.cpp')
-rw-r--r-- | examples/charts/legendmarkers/mainwidget.cpp | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/examples/charts/legendmarkers/mainwidget.cpp b/examples/charts/legendmarkers/mainwidget.cpp new file mode 100644 index 00000000..f71e7a61 --- /dev/null +++ b/examples/charts/legendmarkers/mainwidget.cpp @@ -0,0 +1,177 @@ +/**************************************************************************** +** +** Copyright (C) 2014 Digia Plc +** All rights reserved. +** For any questions to Digia, please use contact form at http://qt.digia.com +** +** This file is part of the Qt Enterprise Charts Add-on. +** +** $QT_BEGIN_LICENSE$ +** Licensees holding valid Qt Enterprise licenses may use this file in +** accordance with the Qt Enterprise License Agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Digia. +** +** If you have questions regarding the use of this file, please use +** contact form at http://qt.digia.com +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "mainwidget.h" +#include <QChart> +#include <QChartView> +#include <QPushButton> +#include <QLabel> +#include <QDebug> +#include <QLegend> +#include <QFormLayout> +#include <QLegendMarker> +#include <QLineSeries> +#include <QXYLegendMarker> +#include <qmath.h> + +QT_CHARTS_USE_NAMESPACE + +MainWidget::MainWidget(QWidget *parent) : + QWidget(parent) +{ + // Create chart view with the chart + m_chart = new QChart(); + m_chartView = new QChartView(m_chart, this); + + // Create layout for grid and detached legend + m_mainLayout = new QGridLayout(); + m_mainLayout->addWidget(m_chartView, 0, 1, 3, 1); + setLayout(m_mainLayout); + + // Add few series + addSeries(); + addSeries(); + addSeries(); + addSeries(); + + connectMarkers(); + + // Set the title and show legend + m_chart->setTitle("Legendmarker example (click on legend)"); + m_chart->legend()->setVisible(true); + m_chart->legend()->setAlignment(Qt::AlignBottom); + + m_chartView->setRenderHint(QPainter::Antialiasing); +} + +void MainWidget::addSeries() +{ + QLineSeries *series = new QLineSeries(); + m_series.append(series); + + series->setName(QString("line " + QString::number(m_series.count()))); + + // Make some sine wave for data + QList<QPointF> data; + int offset = m_chart->series().count(); + for (int i = 0; i < 360; i++) { + qreal x = offset * 20 + i; + data.append(QPointF(i, qSin(2.0 * 3.141592 * x / 360.0))); + } + + series->append(data); + m_chart->addSeries(series); + + if (m_series.count() == 1) { + m_chart->createDefaultAxes(); + } +} + +void MainWidget::removeSeries() +{ + // Remove last series from chart + if (m_series.count() > 0) { + QLineSeries *series = m_series.last(); + m_chart->removeSeries(series); + m_series.removeLast(); + delete series; + } +} + +void MainWidget::connectMarkers() +{ +//![1] + // Connect all markers to handler + foreach (QLegendMarker* marker, m_chart->legend()->markers()) { + // Disconnect possible existing connection to avoid multiple connections + QObject::disconnect(marker, SIGNAL(clicked()), this, SLOT(handleMarkerClicked())); + QObject::connect(marker, SIGNAL(clicked()), this, SLOT(handleMarkerClicked())); + } +//![1] +} + +void MainWidget::disconnectMarkers() +{ +//![2] + foreach (QLegendMarker* marker, m_chart->legend()->markers()) { + QObject::disconnect(marker, SIGNAL(clicked()), this, SLOT(handleMarkerClicked())); + } +//![2] +} + +void MainWidget::handleMarkerClicked() +{ +//![3] + QLegendMarker* marker = qobject_cast<QLegendMarker*> (sender()); + Q_ASSERT(marker); +//![3] + +//![4] + switch (marker->type()) +//![4] + { + case QLegendMarker::LegendMarkerTypeXY: + { +//![5] + // Toggle visibility of series + marker->series()->setVisible(!marker->series()->isVisible()); + + // Turn legend marker back to visible, since hiding series also hides the marker + // and we don't want it to happen now. + marker->setVisible(true); +//![5] + +//![6] + // Dim the marker, if series is not visible + qreal alpha = 1.0; + + if (!marker->series()->isVisible()) { + alpha = 0.5; + } + + QColor color; + QBrush brush = marker->labelBrush(); + color = brush.color(); + color.setAlphaF(alpha); + brush.setColor(color); + marker->setLabelBrush(brush); + + brush = marker->brush(); + color = brush.color(); + color.setAlphaF(alpha); + brush.setColor(color); + marker->setBrush(brush); + + QPen pen = marker->pen(); + color = pen.color(); + color.setAlphaF(alpha); + pen.setColor(color); + marker->setPen(pen); + +//![6] + break; + } + default: + { + qDebug() << "Unknown marker type"; + break; + } + } +} |