運行截圖如下：

文件結構圖如下：

代碼如下：

widget.h

#ifndef WIDGET_H #define WIDGET_H#include <QWidget> #include <QVector> #include "qcustomplot.h"namespace Ui { class Widget; }class Widget : public QWidget {Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();void timerEvent(QTimerEvent *event);public slots:void btnClicked();private:Ui::Widget *ui;QVector<double> m_x,m_y;QCPItemText *m_groupTracerText;QCPItemCurve *m_groupTracerArrow;int m_timerId;int m_timeNum; };#endif // WIDGET_H

widget.cpp

#include "widget.h" #include "ui_widget.h"Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget) {ui->setupUi(this);for(int i=0;i<200;i++){m_x.append(i);m_y.append(m_x[i]*m_x[i]*i);}this->setWindowTitle("CSDN IT1995");ui->widget->addGraph();ui->widget->graph()->setData(m_x,m_y);ui->widget->graph()->setScatterStyle(QCPScatterStyle(QCPScatterStyle::ssCircle, QPen(Qt::red, 3), QBrush(Qt::white), 22));ui->widget->graph()->setPen(QPen(Qt::red,3));ui->widget->setInteractions(QCP::iRangeDrag|QCP::iRangeZoom|QCP::iSelectLegend);ui->widget->xAxis->setBasePen(QPen(Qt::red, 1));ui->widget->yAxis->setBasePen(QPen(Qt::red, 1));ui->widget->xAxis->setSubTickPen(QPen(Qt::red, 1));ui->widget->yAxis->setSubTickPen(QPen(Qt::red, 1));ui->widget->xAxis->setTickLabelColor(Qt::red);ui->widget->yAxis->setTickLabelColor(Qt::red);ui->widget->xAxis->grid()->setPen(QPen(QColor(40, 40, 40), 1));ui->widget->yAxis->grid()->setPen(QPen(QColor(40, 40, 40), 1));ui->widget->xAxis->grid()->setSubGridPen(QPen(QColor(180, 180, 180), 1));ui->widget->yAxis->grid()->setSubGridPen(QPen(QColor(180, 180, 180), 1));m_groupTracerArrow = new QCPItemCurve(ui->widget);m_groupTracerText = new QCPItemText(ui->widget);QColor color(0, 0, 0);color.setAlphaF(0);m_groupTracerArrow->setPen(color);m_groupTracerText->setText("");m_timeNum=0;ui->widget->replot();connect(ui->pushButton,SIGNAL(clicked(bool)),this,SLOT(btnClicked()));m_timerId=startTimer(1000); }Widget::~Widget() {delete ui; }void Widget::timerEvent(QTimerEvent *event) {if(event->timerId()==m_timerId){m_timeNum++;}if(m_timeNum>1){QColor color(0, 0, 0);color.setAlphaF(0);m_groupTracerArrow->setPen(color);m_groupTracerText->setText("");m_timeNum=0;ui->widget->replot();} }void Widget::btnClicked() {ui->widget->xAxis->setRange(ui->spinBox->text().toInt()-10,ui->spinBox->text().toInt()+10);ui->widget->yAxis->setRange(m_y[ui->spinBox->text().toInt()]-10,m_y[ui->spinBox->text().toInt()]+10);m_groupTracerText->setColor(Qt::red);m_groupTracerText->position->setType(QCPItemPosition::ptAxisRectRatio);m_groupTracerText->setPositionAlignment(Qt::AlignRight|Qt::AlignTop);m_groupTracerText->position->setCoords(1.0, 0.20);m_groupTracerText->setText("就是這個點");m_groupTracerText->setTextAlignment(Qt::AlignLeft);m_groupTracerText->setFont(QFont(font().family(), 9));m_groupTracerText->setPadding(QMargins(8, 0, 0, 0));m_groupTracerArrow->setPen(QPen(Qt::red));m_groupTracerArrow->start->setParentAnchor(m_groupTracerText->left);m_groupTracerArrow->startDir->setParentAnchor(m_groupTracerArrow->start);m_groupTracerArrow->startDir->setCoords(-40, 0);m_groupTracerArrow->end->setCoords(m_x[ui->spinBox->text().toInt()],m_y[ui->spinBox->text().toInt()]);m_groupTracerArrow->endDir->setParentAnchor(m_groupTracerArrow->end);m_groupTracerArrow->endDir->setCoords(0, -40);m_groupTracerArrow->setHead(QCPLineEnding::esSpikeArrow);m_groupTracerArrow->setTail(QCPLineEnding(QCPLineEnding::esBar,(m_groupTracerText->bottom->pixelPosition().y()-m_groupTracerText->top->pixelPosition().y())*0.85));ui->widget->replot(); }

main.cpp

#include "widget.h" #include <QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);Widget w;w.show();return a.exec(); }

總結

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