鼠标点击信号和绘图

//mainwindow.h

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

private slots:

    void on_setbt_clicked();

    void on_startbt_clicked();

    void func();

private:

    Ui::MainWindow *ui;

};

#endif // MAINWINDOW_H

//mainwindow.cpp

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include <QString>

#include <QTimer>

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::on_setbt_clicked()

{

    QString a=ui->lineEdit->text();

    int s=a.toInt();

    ui->horizontalSlider->setValue(s);

    ui->progressBar->setValue(s);

}

void MainWindow::on_startbt_clicked()

{

    QTimer *t=new QTimer(this);

    connect(t,SIGNAL(timeout()),this,SLOT(func()));

    t->start(1000);

}

void MainWindow::func(){

    QString a=ui->lineEdit->text();

    int s=a.toInt();

    if(s<100){

    s++;

    ui->lineEdit->setText(QString::number(s));

    ui->horizontalSlider->setValue(s);

    ui->progressBar->setValue(s);

    }

    else{

        s=0;

        ui->lineEdit->setText(QString::number(s));

        ui->horizontalSlider->setValue(s);

        ui->progressBar->setValue(s);

    }

}