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/****************************************************************************
**
** 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();
}
}
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