view.cpp Example File

callout/view.cpp
/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the Qt Charts module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:GPL$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3 or (at your option) any later version ** approved by the KDE Free Qt Foundation. The licenses are as published by ** the Free Software Foundation and appearing in the file LICENSE.GPL3 ** included in the packaging of this file. Please review the following ** information to ensure the GNU General Public License requirements will ** be met: https://www.gnu.org/licenses/gpl-3.0.html. ** ** $QT_END_LICENSE$ ** ****************************************************************************/
#include "view.h" #include <QtGui/QResizeEvent> #include <QtWidgets/QGraphicsScene> #include <QtCharts/QChart> #include <QtCharts/QLineSeries> #include <QtCharts/QSplineSeries> #include <QtWidgets/QGraphicsTextItem> #include "callout.h" #include <QtGui/QMouseEvent> View::View(QWidget *parent) : QGraphicsView(new QGraphicsScene, parent), m_coordX(0), m_coordY(0), m_chart(0), m_tooltip(0) { setDragMode(QGraphicsView::NoDrag); setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); // chart m_chart = new QChart; m_chart->setMinimumSize(640, 480); m_chart->setTitle("Hover the line to show callout. Click the line to make it stay"); m_chart->legend()->hide(); QLineSeries *series = new QLineSeries; series->append(1, 3); series->append(4, 5); series->append(5, 4.5); series->append(7, 1); series->append(11, 2); m_chart->addSeries(series); QSplineSeries *series2 = new QSplineSeries; series2->append(1.6, 1.4); series2->append(2.4, 3.5); series2->append(3.7, 2.5); series2->append(7, 4); series2->append(10, 2); m_chart->addSeries(series2); m_chart->createDefaultAxes(); m_chart->setAcceptHoverEvents(true); setRenderHint(QPainter::Antialiasing); scene()->addItem(m_chart); m_coordX = new QGraphicsSimpleTextItem(m_chart); m_coordX->setPos(m_chart->size().width()/2 - 50, m_chart->size().height()); m_coordX->setText("X: "); m_coordY = new QGraphicsSimpleTextItem(m_chart); m_coordY->setPos(m_chart->size().width()/2 + 50, m_chart->size().height()); m_coordY->setText("Y: "); connect(series, &QLineSeries::clicked, this, &View::keepCallout); connect(series, &QLineSeries::hovered, this, &View::tooltip); connect(series2, &QSplineSeries::clicked, this, &View::keepCallout); connect(series2, &QSplineSeries::hovered, this, &View::tooltip); this->setMouseTracking(true); } void View::resizeEvent(QResizeEvent *event) { if (scene()) { scene()->setSceneRect(QRect(QPoint(0, 0), event->size())); m_chart->resize(event->size()); m_coordX->setPos(m_chart->size().width()/2 - 50, m_chart->size().height() - 20); m_coordY->setPos(m_chart->size().width()/2 + 50, m_chart->size().height() - 20); const auto callouts = m_callouts; for (Callout *callout : callouts) callout->updateGeometry(); } QGraphicsView::resizeEvent(event); } void View::mouseMoveEvent(QMouseEvent *event) { m_coordX->setText(QString("X: %1").arg(m_chart->mapToValue(event->pos()).x())); m_coordY->setText(QString("Y: %1").arg(m_chart->mapToValue(event->pos()).y())); QGraphicsView::mouseMoveEvent(event); } void View::keepCallout() { m_callouts.append(m_tooltip); m_tooltip = new Callout(m_chart); } void View::tooltip(QPointF point, bool state) { if (m_tooltip == 0) m_tooltip = new Callout(m_chart); if (state) { m_tooltip->setText(QString("X: %1 \nY: %2 ").arg(point.x()).arg(point.y())); m_tooltip->setAnchor(point); m_tooltip->setZValue(11); m_tooltip->updateGeometry(); m_tooltip->show(); } else { m_tooltip->hide(); } }