HMI-28-【运动模式】给速度表添加数字显示

​ 今天我要做的功能时给速度表添加数字显示。就是下图中左侧的888

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关键字： QPainter、number、Opacity、StyleSheet、Qt

实现数字布局

​ 首先需要准备我们的素材，在PS中将数字资源导出，被稍作处理。

​ 在Qt的数字仪表界面中，添加3个Label用来显示三位数字，如下图所示

代码实现

​ 代码实现很简单，就是根据当前出入车速，解析出个十百对饮的数字，改变数字资源即可，代码如下：这里其实应该规范化一下，把实现函数在包一个函数。

void MDS_LeftMiniDisplay::setCarSpeed(int speed)
{
    int one,ten,hundred;
    one = speed%10;
    ten = (speed%100)/10;
    hundred = speed/100;
    switch (one) {
    default:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/8.png);}");
        break;
    }
    case 0:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/0.png);}");
        break;
    }
    case 1:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/1.png);}");
        break;
    }
    case 2:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/2.png);}");
        break;
    }
    case 3:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/3.png);}");
        break;
    }
    case 4:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/4.png);}");
        break;
    }
    case 5:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/5.png);}");
        break;
    }
    case 6:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/6.png);}");
        break;
    }
    case 7:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/7.png);}");
        break;
    }
    case 8:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/8.png);}");
        break;
    }
    case 9:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/9.png);}");
        break;
    }

    }

    switch (ten) {
    default:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/8.png);}");
        break;
    }
    case 0:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/0.png);}");
        break;
    }
    case 1:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/1.png);}");
        break;
    }
    case 2:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/2.png);}");
        break;
    }
    case 3:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/3.png);}");
        break;
    }
    case 4:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/4.png);}");
        break;
    }
    case 5:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/5.png);}");
        break;
    }
    case 6:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/6.png);}");
        break;
    }
    case 7:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/7.png);}");
        break;
    }
    case 8:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/8.png);}");
        break;
    }
    case 9:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/9.png);}");
        break;
    }

    }

    switch (hundred) {
    default:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/8.png);}");
        break;
    }
    case 0:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/0.png);}");
        break;
    }
    case 1:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/1.png);}");
        break;
    }
    case 2:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/2.png);}");
        break;
    }
    case 3:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/3.png);}");
        break;
    }
    case 4:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/4.png);}");
        break;
    }
    case 5:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/5.png);}");
        break;
    }
    case 6:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/6.png);}");
        break;
    }
    case 7:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/7.png);}");
        break;
    }
    case 8:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/8.png);}");
        break;
    }
    case 9:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/9.png);}");
        break;
    }

    }
}

代码改进，隐藏实现

​ 已经改了，这样我的内部实现函数void MDS_LeftMiniDisplay::setCarSpeedNumber(int speed)是私有函数，实现不可见，更符合C++的规范吧。

void MDS_LeftMiniDisplay::setCarSpeed(int speed)
{
    this->setCarSpeedNumber(speed);
}

void MDS_LeftMiniDisplay::setCarSpeedNumber(int speed)
{
    int one,ten,hundred;
    one = speed%10;
    ten = (speed%100)/10;
    hundred = speed/100;
    switch (one) {
    default:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/0.png);}");
        break;
    }
    case 0:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/0.png);}");
        break;
    }
    case 1:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/1.png);}");
        break;
    }
    case 2:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/2.png);}");
        break;
    }
    case 3:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/3.png);}");
        break;
    }
    case 4:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/4.png);}");
        break;
    }
    case 5:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/5.png);}");
        break;
    }
    case 6:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/6.png);}");
        break;
    }
    case 7:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/7.png);}");
        break;
    }
    case 8:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/8.png);}");
        break;
    }
    case 9:
    {
        ui->label_number_3->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/9.png);}");
        break;
    }

    }

    switch (ten) {
    default:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/0.png);}");
        break;
    }
    case 0:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/0.png);}");
        break;
    }
    case 1:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/1.png);}");
        break;
    }
    case 2:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/2.png);}");
        break;
    }
    case 3:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/3.png);}");
        break;
    }
    case 4:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/4.png);}");
        break;
    }
    case 5:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/5.png);}");
        break;
    }
    case 6:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/6.png);}");
        break;
    }
    case 7:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/7.png);}");
        break;
    }
    case 8:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/8.png);}");
        break;
    }
    case 9:
    {
        ui->label_number_2->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/9.png);}");
        break;
    }

    }

    switch (hundred) {
    default:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/0.png);}");
        break;
    }
    case 0:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/0.png);}");
        break;
    }
    case 1:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/1.png);}");
        break;
    }
    case 2:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/2.png);}");
        break;
    }
    case 3:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/3.png);}");
        break;
    }
    case 4:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/4.png);}");
        break;
    }
    case 5:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/5.png);}");
        break;
    }
    case 6:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/6.png);}");
        break;
    }
    case 7:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/7.png);}");
        break;
    }
    case 8:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/8.png);}");
        break;
    }
    case 9:
    {
        ui->label_number_1->setStyleSheet("QLabel{border-image:url(:/Sport/Resources/MeterDisplay/Sport/MDSL/number/9.png);}");
        break;
    }

    }
}

整体进度

​ 目前速度表的指针已经可以动了，并且也有数字显示了，如下图：

说明：

本项目中所使借鉴原型来自：[吉利] 博瑞GE | 仪表HMI设计、吉利汽车HMI项目。

设计图的所有权和解释权都归吉利汽车所有。

本项目所有资源文件均有打不死的小海复刻制作。

本项目代码暂时不会开源，有需要的源码的可与我联系，左上角二维码加微信。

本项目仅限学习交流、禁止商业使用。