在具有多个 y 轴的 Qt 图表中显示工具提示
Showing tooltip in a Qt chart with multiple y axes
我正在努力实现永久工具提示功能,即在悬停时显示工具提示,并使工具提示在我有线系列和样条系列的图表中单击时永久保留。这基本上是 Qt Callout 示例 Here's the link 的不同版本。我实施的唯一变化是我使用 QValueAxis 在左侧添加两个 y 轴,每个系列一个。他们共享同一个 x 轴。现在,当我尝试 运行 程序时,工具提示对于直线曲线显示正确,但在样条曲线的情况下却放错了位置。它出现在我悬停鼠标指针的曲线点下方的某个距离处。
当我使用 createddefaultaxes() 使用单个 y 轴时,不会出现此问题。
单y轴结果
具有多个 y 轴的结果
我已经 post 编辑了下面与点击和悬停功能相关的代码。此代码中使用了 class "Callout" 的对象,因此这里是 code for Callout(与我之前编辑的 post 相同 link)。我无法弄清楚哪些标注代码片段与这个问题最相关,因此我不得不 post link.
// chart
m_chart = new QChart;
QLineSeries *series = new QLineSeries;
//appended some (x,y) values to series and added to chart
m_chart->addSeries(series);
QSplineSeries *series2 = new QSplineSeries;
//appended some (x,y) values to series2 and added to chart
m_chart->addSeries(series2);
//m_chart->createDefaultAxes(); for single y axis
QValueAxis *axisX = new QValueAxis;
QValueAxis *axisY1 = new QValueAxis; //for multiple y axes
QValueAxis *axisY2 = new QValueAxis;
m_chart->addAxis(axisX, Qt::AlignBottom);
m_chart->addAxis(axisY1, Qt::AlignLeft);
m_chart->addAxis(axisY2, Qt::AlignLeft);
series->attachAxis(axisX);
series->attachAxis(axisY1);
series2->attachAxis(axisX);
series2->attachAxis(axisY2);
m_chart->setAcceptHoverEvents(true);
setRenderHint(QPainter::Antialiasing);
scene()->addItem(m_chart);
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);
// keepCallout() function
{
m_callouts.append(m_tooltip);//m_callouts is a QList of "Callout" class type
m_tooltip = new Callout(m_chart);
}
//tooltip(QPointF point, bool state) function
{
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();
}
}
mapToPosition()
returns 给定位置的值取决于它们所属的系列,在您有 2 个轴的情况下,该值需要明确指示系列。为此,callout
必须具有存储系列的属性。
view.cpp
...
void View::keepCallout()
{
QAbstractSeries *series = qobject_cast<QAbstractSeries *>(sender());
m_callouts.append(m_tooltip);
m_tooltip = new Callout(m_chart, series);
m_tooltip->hide();
}
void View::tooltip(QPointF point, bool state)
{
QAbstractSeries *series = qobject_cast<QAbstractSeries *>(sender());
if (m_tooltip == 0){
m_tooltip = new Callout(m_chart, series);
}
if (state) {
m_tooltip->setSeries(series);
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();
}
}
callout.h
#ifndef CALLOUT_H
#define CALLOUT_H
#include <QtCharts/QChartGlobal>
#include <QtWidgets/QGraphicsItem>
#include <QtGui/QFont>
QT_BEGIN_NAMESPACE
class QGraphicsSceneMouseEvent;
QT_END_NAMESPACE
QT_CHARTS_BEGIN_NAMESPACE
class QChart;
class QAbstractSeries;
QT_CHARTS_END_NAMESPACE
QT_CHARTS_USE_NAMESPACE
class Callout : public QGraphicsItem
{
public:
Callout(QChart *chart, QAbstractSeries *series);
void setText(const QString &text);
void setAnchor(QPointF point);
void updateGeometry();
QRectF boundingRect() const;
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,QWidget *widget);
void setSeries(QAbstractSeries *series);
protected:
void mousePressEvent(QGraphicsSceneMouseEvent *event);
void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
private:
QString m_text;
QRectF m_textRect;
QRectF m_rect;
QPointF m_anchor;
QFont m_font;
QChart *m_chart;
QAbstractSeries *m_series;
};
#endif // CALLOUT_H
callout.cpp
#include "callout.h"
#include <QtGui/QPainter>
#include <QtGui/QFontMetrics>
#include <QtWidgets/QGraphicsSceneMouseEvent>
#include <QtGui/QMouseEvent>
#include <QtCharts/QChart>
Callout::Callout(QChart *chart, QAbstractSeries *series):
QGraphicsItem(chart),
m_chart(chart),
m_series(series)
{
}
QRectF Callout::boundingRect() const
{
QPointF anchor = mapFromParent(m_chart->mapToPosition(m_anchor, m_series));
QRectF rect;
rect.setLeft(qMin(m_rect.left(), anchor.x()));
rect.setRight(qMax(m_rect.right(), anchor.x()));
rect.setTop(qMin(m_rect.top(), anchor.y()));
rect.setBottom(qMax(m_rect.bottom(), anchor.y()));
return rect;
}
void Callout::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
Q_UNUSED(option)
Q_UNUSED(widget)
QPainterPath path;
path.addRoundedRect(m_rect, 5, 5);
QPointF anchor = mapFromParent(m_chart->mapToPosition(m_anchor, m_series));
if (!m_rect.contains(anchor)) {
QPointF point1, point2;
// establish the position of the anchor point in relation to m_rect
bool above = anchor.y() <= m_rect.top();
bool aboveCenter = anchor.y() > m_rect.top() && anchor.y() <= m_rect.center().y();
bool belowCenter = anchor.y() > m_rect.center().y() && anchor.y() <= m_rect.bottom();
bool below = anchor.y() > m_rect.bottom();
bool onLeft = anchor.x() <= m_rect.left();
bool leftOfCenter = anchor.x() > m_rect.left() && anchor.x() <= m_rect.center().x();
bool rightOfCenter = anchor.x() > m_rect.center().x() && anchor.x() <= m_rect.right();
bool onRight = anchor.x() > m_rect.right();
// get the nearest m_rect corner.
qreal x = (onRight + rightOfCenter) * m_rect.width();
qreal y = (below + belowCenter) * m_rect.height();
bool cornerCase = (above && onLeft) || (above && onRight) || (below && onLeft) || (below && onRight);
bool vertical = qAbs(anchor.x() - x) > qAbs(anchor.y() - y);
qreal x1 = x + leftOfCenter * 10 - rightOfCenter * 20 + cornerCase * !vertical * (onLeft * 10 - onRight * 20);
qreal y1 = y + aboveCenter * 10 - belowCenter * 20 + cornerCase * vertical * (above * 10 - below * 20);;
point1.setX(x1);
point1.setY(y1);
qreal x2 = x + leftOfCenter * 20 - rightOfCenter * 10 + cornerCase * !vertical * (onLeft * 20 - onRight * 10);;
qreal y2 = y + aboveCenter * 20 - belowCenter * 10 + cornerCase * vertical * (above * 20 - below * 10);;
point2.setX(x2);
point2.setY(y2);
path.moveTo(point1);
path.lineTo(anchor);
path.lineTo(point2);
path = path.simplified();
}
painter->setBrush(QColor(255, 255, 255));
painter->drawPath(path);
painter->drawText(m_textRect, m_text);
}
void Callout::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
event->setAccepted(true);
}
void Callout::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
if (event->buttons() & Qt::LeftButton){
setPos(mapToParent(event->pos() - event->buttonDownPos(Qt::LeftButton)));
event->setAccepted(true);
} else {
event->setAccepted(false);
}
}
void Callout::setSeries(QAbstractSeries *series)
{
m_series = series;
}
void Callout::setText(const QString &text)
{
m_text = text;
QFontMetrics metrics(m_font);
m_textRect = metrics.boundingRect(QRect(0, 0, 150, 150), Qt::AlignLeft, m_text);
m_textRect.translate(5, 5);
prepareGeometryChange();
m_rect = m_textRect.adjusted(-5, -5, 5, 5);
}
void Callout::setAnchor(QPointF point)
{
m_anchor = point;
}
void Callout::updateGeometry()
{
prepareGeometryChange();
setPos(m_chart->mapToPosition(m_anchor, m_series) + QPoint(10, -50));
}
您可以在下面找到完整的代码link
我正在努力实现永久工具提示功能,即在悬停时显示工具提示,并使工具提示在我有线系列和样条系列的图表中单击时永久保留。这基本上是 Qt Callout 示例 Here's the link 的不同版本。我实施的唯一变化是我使用 QValueAxis 在左侧添加两个 y 轴,每个系列一个。他们共享同一个 x 轴。现在,当我尝试 运行 程序时,工具提示对于直线曲线显示正确,但在样条曲线的情况下却放错了位置。它出现在我悬停鼠标指针的曲线点下方的某个距离处。
当我使用 createddefaultaxes() 使用单个 y 轴时,不会出现此问题。
单y轴结果
具有多个 y 轴的结果
我已经 post 编辑了下面与点击和悬停功能相关的代码。此代码中使用了 class "Callout" 的对象,因此这里是 code for Callout(与我之前编辑的 post 相同 link)。我无法弄清楚哪些标注代码片段与这个问题最相关,因此我不得不 post link.
// chart
m_chart = new QChart;
QLineSeries *series = new QLineSeries;
//appended some (x,y) values to series and added to chart
m_chart->addSeries(series);
QSplineSeries *series2 = new QSplineSeries;
//appended some (x,y) values to series2 and added to chart
m_chart->addSeries(series2);
//m_chart->createDefaultAxes(); for single y axis
QValueAxis *axisX = new QValueAxis;
QValueAxis *axisY1 = new QValueAxis; //for multiple y axes
QValueAxis *axisY2 = new QValueAxis;
m_chart->addAxis(axisX, Qt::AlignBottom);
m_chart->addAxis(axisY1, Qt::AlignLeft);
m_chart->addAxis(axisY2, Qt::AlignLeft);
series->attachAxis(axisX);
series->attachAxis(axisY1);
series2->attachAxis(axisX);
series2->attachAxis(axisY2);
m_chart->setAcceptHoverEvents(true);
setRenderHint(QPainter::Antialiasing);
scene()->addItem(m_chart);
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);
// keepCallout() function
{
m_callouts.append(m_tooltip);//m_callouts is a QList of "Callout" class type
m_tooltip = new Callout(m_chart);
}
//tooltip(QPointF point, bool state) function
{
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();
}
}
mapToPosition()
returns 给定位置的值取决于它们所属的系列,在您有 2 个轴的情况下,该值需要明确指示系列。为此,callout
必须具有存储系列的属性。
view.cpp
...
void View::keepCallout()
{
QAbstractSeries *series = qobject_cast<QAbstractSeries *>(sender());
m_callouts.append(m_tooltip);
m_tooltip = new Callout(m_chart, series);
m_tooltip->hide();
}
void View::tooltip(QPointF point, bool state)
{
QAbstractSeries *series = qobject_cast<QAbstractSeries *>(sender());
if (m_tooltip == 0){
m_tooltip = new Callout(m_chart, series);
}
if (state) {
m_tooltip->setSeries(series);
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();
}
}
callout.h
#ifndef CALLOUT_H
#define CALLOUT_H
#include <QtCharts/QChartGlobal>
#include <QtWidgets/QGraphicsItem>
#include <QtGui/QFont>
QT_BEGIN_NAMESPACE
class QGraphicsSceneMouseEvent;
QT_END_NAMESPACE
QT_CHARTS_BEGIN_NAMESPACE
class QChart;
class QAbstractSeries;
QT_CHARTS_END_NAMESPACE
QT_CHARTS_USE_NAMESPACE
class Callout : public QGraphicsItem
{
public:
Callout(QChart *chart, QAbstractSeries *series);
void setText(const QString &text);
void setAnchor(QPointF point);
void updateGeometry();
QRectF boundingRect() const;
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,QWidget *widget);
void setSeries(QAbstractSeries *series);
protected:
void mousePressEvent(QGraphicsSceneMouseEvent *event);
void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
private:
QString m_text;
QRectF m_textRect;
QRectF m_rect;
QPointF m_anchor;
QFont m_font;
QChart *m_chart;
QAbstractSeries *m_series;
};
#endif // CALLOUT_H
callout.cpp
#include "callout.h"
#include <QtGui/QPainter>
#include <QtGui/QFontMetrics>
#include <QtWidgets/QGraphicsSceneMouseEvent>
#include <QtGui/QMouseEvent>
#include <QtCharts/QChart>
Callout::Callout(QChart *chart, QAbstractSeries *series):
QGraphicsItem(chart),
m_chart(chart),
m_series(series)
{
}
QRectF Callout::boundingRect() const
{
QPointF anchor = mapFromParent(m_chart->mapToPosition(m_anchor, m_series));
QRectF rect;
rect.setLeft(qMin(m_rect.left(), anchor.x()));
rect.setRight(qMax(m_rect.right(), anchor.x()));
rect.setTop(qMin(m_rect.top(), anchor.y()));
rect.setBottom(qMax(m_rect.bottom(), anchor.y()));
return rect;
}
void Callout::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
Q_UNUSED(option)
Q_UNUSED(widget)
QPainterPath path;
path.addRoundedRect(m_rect, 5, 5);
QPointF anchor = mapFromParent(m_chart->mapToPosition(m_anchor, m_series));
if (!m_rect.contains(anchor)) {
QPointF point1, point2;
// establish the position of the anchor point in relation to m_rect
bool above = anchor.y() <= m_rect.top();
bool aboveCenter = anchor.y() > m_rect.top() && anchor.y() <= m_rect.center().y();
bool belowCenter = anchor.y() > m_rect.center().y() && anchor.y() <= m_rect.bottom();
bool below = anchor.y() > m_rect.bottom();
bool onLeft = anchor.x() <= m_rect.left();
bool leftOfCenter = anchor.x() > m_rect.left() && anchor.x() <= m_rect.center().x();
bool rightOfCenter = anchor.x() > m_rect.center().x() && anchor.x() <= m_rect.right();
bool onRight = anchor.x() > m_rect.right();
// get the nearest m_rect corner.
qreal x = (onRight + rightOfCenter) * m_rect.width();
qreal y = (below + belowCenter) * m_rect.height();
bool cornerCase = (above && onLeft) || (above && onRight) || (below && onLeft) || (below && onRight);
bool vertical = qAbs(anchor.x() - x) > qAbs(anchor.y() - y);
qreal x1 = x + leftOfCenter * 10 - rightOfCenter * 20 + cornerCase * !vertical * (onLeft * 10 - onRight * 20);
qreal y1 = y + aboveCenter * 10 - belowCenter * 20 + cornerCase * vertical * (above * 10 - below * 20);;
point1.setX(x1);
point1.setY(y1);
qreal x2 = x + leftOfCenter * 20 - rightOfCenter * 10 + cornerCase * !vertical * (onLeft * 20 - onRight * 10);;
qreal y2 = y + aboveCenter * 20 - belowCenter * 10 + cornerCase * vertical * (above * 20 - below * 10);;
point2.setX(x2);
point2.setY(y2);
path.moveTo(point1);
path.lineTo(anchor);
path.lineTo(point2);
path = path.simplified();
}
painter->setBrush(QColor(255, 255, 255));
painter->drawPath(path);
painter->drawText(m_textRect, m_text);
}
void Callout::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
event->setAccepted(true);
}
void Callout::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
if (event->buttons() & Qt::LeftButton){
setPos(mapToParent(event->pos() - event->buttonDownPos(Qt::LeftButton)));
event->setAccepted(true);
} else {
event->setAccepted(false);
}
}
void Callout::setSeries(QAbstractSeries *series)
{
m_series = series;
}
void Callout::setText(const QString &text)
{
m_text = text;
QFontMetrics metrics(m_font);
m_textRect = metrics.boundingRect(QRect(0, 0, 150, 150), Qt::AlignLeft, m_text);
m_textRect.translate(5, 5);
prepareGeometryChange();
m_rect = m_textRect.adjusted(-5, -5, 5, 5);
}
void Callout::setAnchor(QPointF point)
{
m_anchor = point;
}
void Callout::updateGeometry()
{
prepareGeometryChange();
setPos(m_chart->mapToPosition(m_anchor, m_series) + QPoint(10, -50));
}
您可以在下面找到完整的代码link