QT开发技术【qcustomplot 曲线与鼠标十字功能】

一、效果

二、代码

#include "obsersingle.h"
#include "ui_obsersingle.h"
#pragma execution_character_set("utf-8") 右键菜单acion回调 
// 适应窗口大小
void ObserSingle::RescaleActionFun::fun(ObserSingle *form)
{// 自适应y轴数据范围，每次 setData 之后都要调用form->customPlot->rescaleAxes(true);form->customPlot->replot(QCustomPlot::rpQueuedReplot); // 重绘
}// 十字游标
void ObserSingle::CursorActionFun::fun(ObserSingle *form)
{// 显示十字游标if(form->cursorShow){form->lineY->point1->setCoords(0, 0);form->lineY->point2->setCoords(0, 0);form->lineX->point1->setCoords(0, 0);form->lineX->point2->setCoords(0, 0);form->cursorShow = false;}else{form->cursorShow = true;}form->customPlot->replot(QCustomPlot::rpQueuedReplot); // 重绘
} ObserSingle 
ObserSingle::ObserSingle(QWidget *parent) :QWidget(parent),ui(new Ui::ObserSingle), clickMenu(new QMenu), lineY(nullptr), lineX(nullptr), cursorShow(false), midButtonPress(false), customPlot(new QCustomPlot)
{ui->setupUi(this);// 创建画布QGridLayout *layout = new QGridLayout();layout->setContentsMargins(2, 2, 2, 2);layout->addWidget(customPlot);ui->plotWindow->setLayout(layout);// 轴设置customPlot->xAxis->setRange(1, 1, Qt::AlignRight);          // 设置轴刻度customPlot->xAxis->ticker()->setTickCount(8);               // 设置轴刻度数目customPlot->xAxis->setLabel(tr("xAxis"));                       // 设置轴标签customPlot->yAxis->setRange(2, 2, Qt::AlignRight);customPlot->yAxis->ticker()->setTickCount(5);customPlot->yAxis->setLabel(tr("yAxis"));// 图例customPlot->legend->setVisible(true);                       // 显示customPlot->legend->setBrush(QColor(255, 255, 255, 50));   // 灰色透明customPlot->legend->setBorderPen(Qt::NoPen);                // 边框隐藏customPlot->legend->setWrap(4);                             // 设置4个图例自动换行customPlot->legend->setFillOrder(QCPLayoutGrid::foRowsFirst);    // 图例优先排序(foRowsFirst foColumnsFirst) foRowsFirst
//    customPlot->plotLayout()->addElement(0, 0, customPlot->legend);     // 图例位置     0 0customPlot->plotLayout()->setRowStretchFactor(0, 0.001);            // 显示比例     0 0.001// 设置基本坐标轴（左侧Y轴和下方X轴）可拖动、可缩放、曲线可选、legend可选、设置伸缩比例，使所有图例可见customPlot->setInteractions(QCP::iRangeDrag|QCP::iRangeZoom| QCP::iSelectAxes | QCP::iSelectLegend | QCP::iSelectPlottables);
//    customPlot->setInteractions(QCP::iRangeDrag|QCP::iRangeZoom| QCP::iSelectAxes );// 设置legend只能选择图例customPlot->legend->setSelectableParts(QCPLegend::spItems);// 设置图例与曲线同步选中QObject::connect(customPlot, SIGNAL(selectionChangedByUser()), this, SLOT(selectionChanged()));// 右键action 适应窗口大小clickMenuAddAction(tr("适应窗口大小"), ":/reference/image/plot.png", new RescaleActionFun);// 右键action 十字游标clickMenuAddAction(tr("十字游标"), ":/reference/image/plot.png", new CursorActionFun);// 鼠标右键菜单栏QObject::connect(customPlot, SIGNAL(mousePress(QMouseEvent*)), this, SLOT(onMousePress(QMouseEvent *)));// 提示线lineY = new QCPItemStraightLine(customPlot);lineY->setLayer("overlay");lineY->setPen(QPen(Qt::gray, 1, Qt::DashLine));lineY->setClipToAxisRect(true);lineY->point1->setCoords(0, 0);lineY->point2->setCoords(0, 0);lineX = new QCPItemStraightLine(customPlot);lineX->setLayer("overlay");lineX->setPen(QPen(Qt::gray, 1, Qt::DashLine));lineX->setClipToAxisRect(true);lineX->point1->setCoords(0, 0);lineX->point2->setCoords(0, 0);// 鼠标移动QObject::connect(customPlot, SIGNAL(mouseMove(QMouseEvent*)), this, SLOT(onMouseMove(QMouseEvent *)));// 鼠标释放QObject::connect(customPlot, SIGNAL(mouseRelease(QMouseEvent*)), this,  SLOT(onMouseRelease(QMouseEvent *)));// 自适应y轴数据范围，每次 setData 之后都要调用customPlot->rescaleAxes(true);customPlot->replot(QCustomPlot::rpQueuedReplot); // 重绘//    customPlot->setOpenGl(true);
//    qDebug()<<"opengle="<<customPlot->openGl();
}ObserSingle::~ObserSingle()
{ui->plotWindow->layout()->deleteLater();QList<QString> keyList = actionFunMap.keys();for(int i=0; i<keyList.size(); i++){if(actionFunMap[keyList[i]]){delete actionFunMap[keyList[i]];}}QList<QAction *> actionList = actionMap.keys();for(int i=0; i<actionList.size(); i++){if(actionList.at(i)){delete actionList.at(i);}}if(clickMenu){clickMenu->deleteLater();}if(customPlot){customPlot->deleteLater();}delete ui;
}/** 鼠标移动 */
void ObserSingle::onMouseMove(QMouseEvent *event)
{if(midButtonPress){// posPress 与 QCursor::pos() 比较QPoint pos = QCursor::pos();int xLen = pos.x() - posPress.x();int yLen = pos.y() - posPress.y();if(qAbs(xLen) - qAbs(yLen) > 0){// 拉伸x轴if(xLen > 0){double xSize = customPlot->xAxis->range().upper - customPlot->xAxis->range().lower;customPlot->xAxis->setRangeLower(customPlot->xAxis->range().lower + xSize/20);customPlot->xAxis->setRangeUpper(customPlot->xAxis->range().upper - xSize/20);}else{double xSize = customPlot->xAxis->range().upper - customPlot->xAxis->range().lower;customPlot->xAxis->setRangeLower(customPlot->xAxis->range().lower - xSize/20);customPlot->xAxis->setRangeUpper(customPlot->xAxis->range().upper + xSize/20);}}else{// 拉伸y轴if(yLen > 0){double ySize = customPlot->yAxis->range().upper - customPlot->yAxis->range().lower;customPlot->yAxis->setRangeLower(customPlot->yAxis->range().lower - ySize/20);customPlot->yAxis->setRangeUpper(customPlot->yAxis->range().upper + ySize/20);}else{double ySize = customPlot->yAxis->range().upper - customPlot->yAxis->range().lower;customPlot->yAxis->setRangeLower(customPlot->yAxis->range().lower + ySize/20);customPlot->yAxis->setRangeUpper(customPlot->yAxis->range().upper - ySize/20);}}posPress = pos;customPlot->replot(QCustomPlot::rpQueuedReplot);}else{// 当前鼠标位置（像素坐标）int x_pos = event->pos().x();int y_pos = event->pos().y();// 像素坐标转成实际的x,y轴的坐标float x_val = customPlot->xAxis->pixelToCoord(x_pos);float y_val = customPlot->yAxis->pixelToCoord(y_pos);if(cursorShow){lineY->point1->setCoords(x_val, customPlot->yAxis->range().lower);lineY->point2->setCoords(x_val, customPlot->yAxis->range().upper);lineX->point1->setCoords(customPlot->xAxis->range().lower, y_val);lineX->point2->setCoords(customPlot->xAxis->range().upper, y_val);customPlot->replot(QCustomPlot::rpQueuedReplot);}QToolTip::hideText();QToolTip::showText(event->globalPos(),QString("x:%1 y:%2").arg(x_val).arg(y_val),this, rect());}
}/** 图例与曲线同步选中 */
void ObserSingle::selectionChanged()
{// make top and bottom axes be selected synchronously, and handle axis and tick labels as one selectable object:if (customPlot->xAxis->selectedParts().testFlag(QCPAxis::spAxis) || customPlot->xAxis->selectedParts().testFlag(QCPAxis::spTickLabels) ||customPlot->xAxis2->selectedParts().testFlag(QCPAxis::spAxis) || customPlot->xAxis2->selectedParts().testFlag(QCPAxis::spTickLabels)){customPlot->xAxis2->setSelectedParts(QCPAxis::spAxis|QCPAxis::spTickLabels);customPlot->xAxis->setSelectedParts(QCPAxis::spAxis|QCPAxis::spTickLabels);}// make left and right axes be selected synchronously, and handle axis and tick labels as one selectable object:if (customPlot->yAxis->selectedParts().testFlag(QCPAxis::spAxis) || customPlot->yAxis->selectedParts().testFlag(QCPAxis::spTickLabels) ||customPlot->yAxis2->selectedParts().testFlag(QCPAxis::spAxis) || customPlot->yAxis2->selectedParts().testFlag(QCPAxis::spTickLabels)){customPlot->yAxis2->setSelectedParts(QCPAxis::spAxis|QCPAxis::spTickLabels);customPlot->yAxis->setSelectedParts(QCPAxis::spAxis|QCPAxis::spTickLabels);}// 将图形的选择与相应图例项的选择同步for (int i=0; i<customPlot->graphCount(); ++i){QCPGraph *graph = customPlot->graph(i);QCPPlottableLegendItem *item = customPlot->legend->itemWithPlottable(graph);if (item->selected() || graph->selected()){item->setSelected(true);// 注意：这句需要Qcustomplot2.0系列版本graph->setSelection(QCPDataSelection(graph->data()->dataRange()));// 这句1.0系列版本即可// graph->setSelected(true);}}
}/** 右键菜单 */
void ObserSingle::onMousePress(QMouseEvent *event)
{if(event->button() == Qt::RightButton){clickMenu->exec(QCursor::pos());}else if(event->button() == Qt::MiddleButton){midButtonPress = true;posPress = QCursor::pos();}
}/** 鼠标释放 */
void ObserSingle::onMouseRelease(QMouseEvent *event)
{if(event->button() == Qt::MiddleButton){midButtonPress = false;}
}/** 右键菜单action点击 */
void ObserSingle::_on_action_create_triggered(void)
{QAction *action = static_cast<QAction *>(this->sender());if(actionMap.contains(action)){if(actionFunMap.contains(actionMap[action])){actionFunMap[actionMap[action]]->fun(this);}}
}/** 创建右键菜单action */
void ObserSingle::clickMenuAddAction(QString name, QString icon, MenuActionFun *fun)
{QAction *action = new QAction(QIcon(icon), name, this);actionMap.insert(action, name);QObject::connect(action, SIGNAL(triggered()), this, SLOT(_on_action_create_triggered()));clickMenu->addAction(action);actionFunMap.insert(name, fun);
}/** 绘制曲线 */
void ObserSingle::drawCurve(const QString name, const QVector<double> x, const QVector<double> y, QPen pen)
{if(curveMap.contains(name)){curveMap[name]->setData(x, y, true);}else{QCPGraph *graph = customPlot->addGraph();graph->setAntialiased(false);               // 关闭抗锯齿可加快绘制速度graph->setAntialiasedFill(false);graph->setAntialiasedScatters(false);graph->setPen(pen);graph->setName(name);graph->setData(x, y, true);curveMap.insert(name, graph);}customPlot->replot(QCustomPlot::rpQueuedReplot); // 重绘
}/** 清除曲线 */
void ObserSingle::clearCurve(const QString name)
{if(curveMap.contains(name)){QVector<double> x, y;// 删除所有曲线
//        customPlot->clearGraphs();QCPGraph *graph;// 移除map曲线curveMap.remove(name);QList<QString> nameList = curveMap.keys();// 重新绘画所有曲线QList<QString> nameListSave;QList<QVector<double>> xList;QList<QVector<double>> yList;QList<QPen> penList;for(int i=0; i<nameList.size(); i++){graph = curveMap[nameList[i]];curveMap.remove(nameList[i]);// 保存曲线数据x.clear();y.clear();for(int data_i=0; data_i<graph->data()->size(); data_i++){x.append(graph->data()->at(data_i)->key);y.append(graph->data()->at(data_i)->value);}// 保存曲线颜色QColor color = graph->pen().color();// 重画曲线
//            DrawCurve(nameList[i], x, y, QPen(color));
//            DrawCurve(nameList[i], x, y);nameListSave.append(nameList[i]);xList.append(x);yList.append(y);penList.append(QPen(color));}customPlot->clearGraphs();for(int i=0; i<nameListSave.size(); i++){drawCurve(nameListSave[i], xList[i], yList[i], penList[i]);}}customPlot->replot(QCustomPlot::rpQueuedReplot); // 重绘
}/** 自适应屏幕 */
void ObserSingle::replot(void)
{customPlot->rescaleAxes(true);
}/** 设置运行状态 */
void ObserSingle::setRunStatus(bool b)
{if(b){customPlot->setInteractions(QCP::iRangeDrag|QCP::iRangeZoom| QCP::iSelectAxes );// 将图形的选择与相应图例项的选择同步取消for (int i=0; i<customPlot->graphCount(); ++i){QCPGraph *graph = customPlot->graph(i);QCPPlottableLegendItem *item = customPlot->legend->itemWithPlottable(graph);if (item->selected() || graph->selected()){item->setSelected(false);QCPDataSelection select;graph->setSelection(select);}}}else{customPlot->setInteractions(QCP::iRangeDrag|QCP::iRangeZoom| QCP::iSelectAxes | QCP::iSelectLegend | QCP::iSelectPlottables);}
}