我之前试用Qt在其它的板子上运行过一个秒表程序，代码编写过程 见：//www.obk20.com/d/1891115.html

先来看下在EASY EAI Nano板子中的运行效果：

1 程序

程序基本上不需要改，只需要调整一下布局已经各个控件的字体大小即可。

表盘界面：

void Widget::paintEvent(QPaintEvent *event)
{
    int side = qMin(width(), height());
​
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);
    painter.translate(width()/2, height()*3/10); //画图的基准位置
    painter.scale(side/300.0, side/300.0); //随窗口尺寸自动缩放
​
    //表盘(3个同心圆)
    for (int i=0; i<PANEL_RADIUS_NUM; i++)
    {
        QBrush brush(stPanelParaArr[i].color);
        QPen pen(stPanelParaArr[i].color);
        painter.setBrush(brush);
        painter.setPen(pen);
        painter.drawEllipse(-stPanelParaArr[i].radius, -stPanelParaArr[i].radius, 2*stPanelParaArr[i].radius, 2*stPanelParaArr[i].radius);
    }
​
    //秒的刻度
    painter.setPen(secondColor);
    for (int i = 0; i < 60; i++)
    {
        if ((i % 5) == 0)
        {
            painter.drawLine(PANEL_RADIUS3-8, 0, PANEL_RADIUS3, 0);
            QFont font("TimesNewRoman", SEC_NUM_SIZE);
            painter.setFont(font);
            painter.drawText(-SEC_NUM_SIZE, -(CLOCK_RADIUS-15), 4*SEC_NUM_SIZE, 4*SEC_NUM_SIZE, Qt::AlignHCenter, QString::number(i==0? 60 : i));
        }
        else
        {
            painter.drawLine(PANEL_RADIUS3-5, 0, PANEL_RADIUS3, 0);
        }
        //秒再细分5个格
        for (int j = 0; j < 5; j++)
        {
            painter.rotate(6.0/5);
            if (j != 4)
            {
                painter.drawLine(PANEL_RADIUS3-2, 0, PANEL_RADIUS3, 0);
            }
        }
    }
​
    //分钟的刻度
    painter.setPen(minuteColor);
    for (int k = 0; k < 30; k++)
    {
        if ((k % 5) == 0)
        {
            painter.rotate(-90.0);
            painter.drawLine(PANEL_RADIUS4-8, 0, PANEL_RADIUS4, 0);
            painter.rotate(90.0);
​
            QFont font("TimesNewRoman", MIN_NUM_SIZE);
            painter.setFont(font);
            painter.drawText(-MIN_NUM_SIZE, -(PANEL_RADIUS4-10), 4*MIN_NUM_SIZE, 4*MIN_NUM_SIZE, Qt::AlignHCenter, QString::number(k==0? 30 : k));
        }
        else
        {
            painter.rotate(-90.0);
            painter.drawLine(PANEL_RADIUS4-4, 0, PANEL_RADIUS4, 0);
            painter.rotate(90.0);
        }
        painter.rotate(12.0);
    }
​
    //分钟的表针
    painter.setPen(Qt::NoPen);
    painter.setBrush(minuteColor);
    painter.save();
    painter.rotate(12.0 * (time.minute() + time.second() / 60.0));
    painter.drawConvexPolygon(minuteHand, 3);
    painter.restore();
​
    //秒钟的表针
    painter.setPen(Qt::NoPen);
    painter.setBrush(secondColor);
    painter.save();
    //painter.rotate(6.0 * time.second());
    painter.rotate(6.0 * (time.second()+time.msec()/1000.0));
    painter.drawConvexPolygon(secondHand, 3);
    painter.restore();
​
    painter.end();
}

按键回调处理：

void Widget::on_Btn_Start_toggled(bool checked)
{
    if (checked)
    {
        timer.start(ADD_TIME_MSEC);
        lastTime = QTime::currentTime();//记录时间戳
        ui->Btn_Start->setText("暂停");
        ui->Btn_Reset->setEnabled(false);
        ui->Btn_Hit->setEnabled(true);
    }
    else
    {
        timer.stop();
        ui->Btn_Start->setText("继续");
        ui->Btn_Reset->setEnabled(true);
        ui->Btn_Hit->setEnabled(false);
    }
}
​
void Widget::on_Btn_Reset_clicked()
{
    m_iHitCnt = 0;
    timer.stop();
    time.setHMS(0,0,0,0);
    ui->Txt_ShowTime->setText("00:00:00");
    ui->Txt_ShowItem->clear();
​
    ui->Btn_Start->setText("开始");
    ui->Btn_Start->setChecked(false);
    ui->Btn_Reset->setEnabled(false);
    ui->Btn_Hit->setEnabled(false);
}
​
void Widget::on_Btn_Hit_clicked()
{
    QString temp;
    m_iHitCnt++;
    temp.sprintf("--计次 %d--", m_iHitCnt);
    ui->Txt_ShowItem->setFontPointSize(7);
    ui->Txt_ShowItem->append(temp);
    ui->Txt_ShowItem->setFontPointSize(9);
    ui->Txt_ShowItem->append(time.toString("[mm:ss.zzz]"));
}

2 编译测试

首先的使用qmake生成Makefile，进入程序源码目录，执行qmake指令：

/home/xxpcb/myTest/imx6ull/otherlib/qt/qt-everywhere-src-5.12.9/arm-qt/bin/qmake

成功执行之后，就可以看到自动生成的Makefile文件，然后执行make指令进行编译

然后将编译的文件复制到EASY EAI Nano板子中运行即可，演示效果见文末视频

3 总结

本篇测试了EASY EAI Nano板子中Qt程序，因为EASY EAI Nano板子已经配置了Qt的运行环境，如果之前有已经写好的Qt程序，对见面布局稍加修改，就可以在EASY EAI Nano板子中运行。