#-------------------------------------------------
#
# Project created by QtCreator 2016-12-27T13:17:47
#
#-------------------------------------------------
QT += core gui
QT += charts
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = samp9_4
TEMPLATE = app
SOURCES += main.cpp
mainwindow.cpp
qwchartview.cpp
HEADERS += mainwindow.h
qwchartview.h
FORMS += mainwindow.ui
RESOURCES +=
res.qrc
mainwindow.h
#ifndef MAINWINDOW_H #define MAINWINDOW_H #includemainwindow.cpp#include //必须这么设置 QT_CHARTS_USE_NAMESPACE //必须这么设置 #include #include "qwchartview.h" namespace Ui { class MainWindow; } class MainWindow : public QMainWindow { Q_OBJECT private: QLabel *labXYValue; //状态栏显示文字标签 void createChart(); //创建图表 void prepareData(); //准备数据 public: explicit MainWindow(QWidget *parent = 0); ~MainWindow(); private slots: void on_LegendMarkerClicked(); //图例单击槽函数,自定义槽函数 void on_mouseMovePoint(QPoint point); //鼠标移动事件，自定义槽函数 void on_actZoomReset_triggered(); //工具栏按钮，原始大小 void on_actZoomIn_triggered(); //工具栏按钮，放大 void on_actZoomOut_triggered(); //工具栏按钮，缩小 private: Ui::MainWindow *ui; }; #endif // MAINWINDOW_H
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "qwchartview.h"
void MainWindow::createChart()
{ //创建图表
QChart *chart = new QChart();
ui->chartView->setChart(chart);
ui->chartView->setRenderHint(QPainter::Antialiasing);
ui->chartView->setCursor(Qt::CrossCursor); //设置鼠标指针为十字星
QLineSeries *series0 = new QLineSeries();
QLineSeries *series1 = new QLineSeries();
series0->setName("Sin曲线");
series1->setName("Cos曲线");
QPen pen;
pen.setStyle(Qt::DotLine);//Qt::SolidLine, Qt::DashLine, Qt::DotLine, Qt::DashDotLine
pen.setWidth(2);
pen.setColor(Qt::red);
series0->setPen(pen);
pen.setStyle(Qt::SolidLine);//Qt::SolidLine, Qt::DashLine, Qt::DotLine, Qt::DashDotLine
pen.setColor(Qt::blue);
series1->setPen(pen);
chart->addSeries(series0);
chart->addSeries(series1);
QValueAxis *axisX = new QValueAxis;
axisX->setRange(0, 10); //设置坐标轴范围
axisX->setLabelFormat("%.1f"); //标签格式
axisX->setTickCount(11); //主分隔个数
axisX->setMinorTickCount(2);//4
axisX->setTitleText("time(secs)"); //标题
// axisX->setGridLineVisible(false);
QValueAxis *axisY = new QValueAxis;
axisY->setRange(-2, 2);
axisY->setTitleText("value");
axisY->setTickCount(5);
axisY->setLabelFormat("%.2f"); //标签格式
// axisY->setGridLineVisible(false);
axisY->setMinorTickCount(2);//4
//下面4行代码在Qt 5.12.1中编译时提示过时，
// chart->setAxisX(axisX, series0); //添加X坐标轴
// chart->setAxisX(axisX, series1); //添加X坐标轴
// chart->setAxisY(axisY, series0); //添加Y坐标轴
// chart->setAxisY(axisY, series1); //添加Y坐标轴
//另外一种添加坐标轴的方式，Qt 5.12.1中编译没问题
chart->addAxis(axisX,Qt::AlignBottom); //坐标轴添加到图表，并指定方向
chart->addAxis(axisY,Qt::AlignLeft);
series0->attachAxis(axisX); //序列 series0 附加坐标轴
series0->attachAxis(axisY);
series1->attachAxis(axisX); //序列 series1 附加坐标轴
series1->attachAxis(axisY);
// chart->legend()->setAlignment(Qt::AlignRight);
foreach (QLegendMarker* marker, chart->legend()->markers())
{
connect(marker, SIGNAL(clicked()), this, SLOT(on_LegendMarkerClicked()));
}
}
void MainWindow::prepareData()
{//为序列生成数据
QLineSeries *series0=(QLineSeries *)ui->chartView->chart()->series().at(0);
QLineSeries *series1=(QLineSeries *)ui->chartView->chart()->series().at(1);
series0->clear();
series1->clear();
qsrand(QTime::currentTime().second());//随机数初始化
qreal t=0,y1,y2,intv=0.1;
qreal rd;
int cnt=100;
for(int i=0;i
rd=(qrand() % 10)-5; //随机数,-5~+5
y1=qSin(t)+rd/50;//+qrand();
series0->append(t,y1);
rd=(qrand() % 10)-5; //随机数,-5~+5
y2=qSin(t+20)+rd/50;
series1->append(t,y2);
t+=intv;
}
}
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
this->setCentralWidget(ui->chartView);
labXYValue = new QLabel("X=, Y= "); //状态栏显示鼠标点的坐标
labXYValue->setMinimumWidth(200);
ui->statusBar->addWidget(labXYValue);
createChart();//创建图表
prepareData();//生成数据
QObject::connect(ui->chartView,SIGNAL(mouseMovePoint(QPoint)),
this, SLOT(on_mouseMovePoint(QPoint))); //鼠标移动事件
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_LegendMarkerClicked()
{//点击图例的marker的响应
QLegendMarker* marker = qobject_cast (sender());
switch (marker->type()) //marker的类型
{
case QLegendMarker::LegendMarkerTypeXY: //QLineSeries序列的图例marker
{
marker->series()->setVisible(!marker->series()->isVisible()); //可见性
marker->setVisible(true);
qreal alpha = 1.0;
if (!marker->series()->isVisible())
alpha = 0.5;
QColor color;
QBrush brush = marker->labelBrush();
color = brush.color();
color.setAlphaF(alpha);
brush.setColor(color);
marker->setLabelBrush(brush);
brush = marker->brush();
color = brush.color();
color.setAlphaF(alpha);
brush.setColor(color);
marker->setBrush(brush);
QPen pen = marker->pen();
color = pen.color();
color.setAlphaF(alpha);
pen.setColor(color);
marker->setPen(pen);
break;
}
default:
break;
}
}
void MainWindow::on_mouseMovePoint(QPoint point)
{ //鼠标移动响应
QPointF pt=ui->chartView->chart()->mapToValue(point); //转换为图表的数值
labXYValue->setText(QString::asprintf("X=%.1f,Y=%.2f",pt.x(),pt.y())); //状态栏显示
}
void MainWindow::on_actZoomReset_triggered()
{ //恢复原始大小
ui->chartView->chart()->zoomReset();
}
void MainWindow::on_actZoomIn_triggered()
{//放大
ui->chartView->chart()->zoom(1.2);
}
void MainWindow::on_actZoomOut_triggered()
{//缩小
ui->chartView->chart()->zoom(0.8);
}
mainwindow.ui
qwchartview.hMainWindow 0 0 729 474 10 鼠标选择缩放与数值显示 50 10 611 331 QGraphicsView::RubberBandDrag 0 0 729 23 Qt::ToolButtonTextBesideIcon TopToolBarArea false :/images/images/414.bmp :/images/images/414.bmp原始大小 原始大小 :/images/images/132.bmp :/images/images/132.bmp退出 退出 :/images/images/418.bmp :/images/images/418.bmp放大 放大 :/images/images/416.bmp :/images/images/416.bmp缩小 缩小 QWChartView QGraphicsView qwchartview.h actQuit triggered() MainWindow close() -1 -1 339 206
#ifndef QWCHARTVIEW_H #define QWCHARTVIEW_H #includeqwchartview.cpp//必须这么设置 QT_CHARTS_USE_NAMESPACE //必须这么设置 class QWChartView : public QChartView { Q_OBJECT private: QPoint beginPoint; //选择矩形区的起点 QPoint endPoint; //选择矩形区的终点 protected: void mousePressEvent(QMouseEvent *event); //鼠标左键按下 void mouseMoveEvent(QMouseEvent *event); //鼠标移动 void mouseReleaseEvent(QMouseEvent *event); //鼠标释放左键 void keyPressEvent(QKeyEvent *event); //按键事件 public: explicit QWChartView(QWidget *parent = 0); ~QWChartView(); signals: void mouseMovePoint(QPoint point); //鼠标移动信号，在mouseMoveEvent()事件中触发 }; #endif // QWCHARTVIEW_H
#include "qwchartview.h" #includevoid QWChartView::mousePressEvent(QMouseEvent *event) {//鼠标左键按下，记录beginPoint if (event->button()==Qt::LeftButton) beginPoint=event->pos(); QChartView::mousePressEvent(event); } void QWChartView::mouseMoveEvent(QMouseEvent *event) {//鼠标移动事件 QPoint point; point=event->pos(); emit mouseMovePoint(point); QChartView::mouseMoveEvent(event); } void QWChartView::mouseReleaseEvent(QMouseEvent *event) { if (event->button()==Qt::LeftButton) { //鼠标左键释放，获取矩形框的endPoint,进行缩放 endPoint=event->pos(); QRectF rectF; rectF.setTopLeft(this->beginPoint); rectF.setBottomRight(this->endPoint); this->chart()->zoomIn(rectF); } else if (event->button()==Qt::RightButton) this->chart()->zoomReset(); //鼠标右键释放，resetZoom QChartView::mouseReleaseEvent(event); } void QWChartView::keyPressEvent(QKeyEvent *event) {//按键控制 switch (event->key()) { case Qt::Key_Plus: //+ chart()->zoom(1.2); break; case Qt::Key_Minus: chart()->zoom(0.8); break; case Qt::Key_Left: chart()->scroll(10, 0); break; case Qt::Key_Right: chart()->scroll(-10, 0); break; case Qt::Key_Up: chart()->scroll(0, -10); break; case Qt::Key_Down: chart()->scroll(0, 10); break; case Qt::Key_PageUp: chart()->scroll(0, 50); break; case Qt::Key_PageDown: chart()->scroll(0, -50); break; case Qt::Key_Home: chart()->zoomReset(); break; default: QGraphicsView::keyPressEvent(event); } // QGraphicsView::keyPressEvent(event); } QWChartView::QWChartView(QWidget *parent):QChartView(parent) { this->setDragMode(QGraphicsView::RubberBandDrag); // this->setRubberBand(QChartView::RectangleRubberBand);//设置为矩形选择方式 // this->setRubberBand(QChartView::VerticalRubberBand); // this->setRubberBand(QChartView::HorizontalRubberBand); this->setMouseTracking(true);//必须开启此功能 } QWChartView::~QWChartView() { }
