Qt Qwdget 汽车仪表知识点拆解1 速度表示

先贴上效果图，注意，没有写逻辑，所以这些都是乱动的

这里线主要说一下中间显示速度的显示制作的方式，在这里，自己专门写了一个数字的仪表

考虑的一般的汽车是没有办法把瞬时速度提升到四位数的，所以我这里就放了三位数，完了根据实时数据，更新这三个label的资源文件，在这个新的类中，只有一个函数，那就是设置数字

void set_number(int num = 0);

下面是实现方法，这个方法应该还可以优化，不过懒得优化了，先把功能堆出来。

void Number_1::set_number(int num)
{
    int temp1 = num;
    int temp2 = num;
    switch (num%10) {
    case 0:
        ui->label_3->setStyleSheet("border-image:url(:/source/number/0.png)");
        break;
    case 1:
        ui->label_3->setStyleSheet("border-image:url(:/source/number/1.png)");
        break;
    case 2:
        ui->label_3->setStyleSheet("border-image:url(:/source/number/2.png)");
        break;
    case 3:
        ui->label_3->setStyleSheet("border-image:url(:/source/number/3.png)");
        break;
    case 4:
        ui->label_3->setStyleSheet("border-image:url(:/source/number/4.png)");
        break;
    case 5:
        ui->label_3->setStyleSheet("border-image:url(:/source/number/5.png)");
        break;
    case 6:
        ui->label_3->setStyleSheet("border-image:url(:/source/number/6.png)");
        break;
    case 7:
        ui->label_3->setStyleSheet("border-image:url(:/source/number/7.png)");
        break;
    case 8:
        ui->label_3->setStyleSheet("border-image:url(:/source/number/8.png)");
        break;
    case 9:
        ui->label_3->setStyleSheet("border-image:url(:/source/number/9.png)");
        break;
    default:
        break;
    }
    switch (temp1/10) {
    case 0:
        ui->label_2->setStyleSheet("border-image:url(:/source/number/0.png)");
        break;
    case 1:
        ui->label_2->setStyleSheet("border-image:url(:/source/number/1.png)");
        break;
    case 2:
        ui->label_2->setStyleSheet("border-image:url(:/source/number/2.png)");
        break;
    case 3:
        ui->label_2->setStyleSheet("border-image:url(:/source/number/3.png)");
        break;
    case 4:
        ui->label_2->setStyleSheet("border-image:url(:/source/number/4.png)");
        break;
    case 5:
        ui->label_2->setStyleSheet("border-image:url(:/source/number/5.png)");
        break;
    case 6:
        ui->label_2->setStyleSheet("border-image:url(:/source/number/6.png)");
        break;
    case 7:
        ui->label_2->setStyleSheet("border-image:url(:/source/number/7.png)");
        break;
    case 8:
        ui->label_2->setStyleSheet("border-image:url(:/source/number/8.png)");
        break;
    case 9:
        ui->label_2->setStyleSheet("border-image:url(:/source/number/9.png)");
        break;
    default:
        break;
    }
    switch (temp2/100) {
    case 0:
        ui->label_1->setStyleSheet("border-image:url(:/source/number/0.png)");
        break;
    case 1:
        ui->label_1->setStyleSheet("border-image:url(:/source/number/1.png)");
        break;
    case 2:
        ui->label_1->setStyleSheet("border-image:url(:/source/number/2.png)");
        break;
    case 3:
        ui->label_1->setStyleSheet("border-image:url(:/source/number/3.png)");
        break;
    case 4:
        ui->label_1->setStyleSheet("border-image:url(:/source/number/4.png)");
        break;
    case 5:
        ui->label_1->setStyleSheet("border-image:url(:/source/number/5.png)");
        break;
    case 6:
        ui->label_1->setStyleSheet("border-image:url(:/source/number/6.png)");
        break;
    case 7:
        ui->label_1->setStyleSheet("border-image:url(:/source/number/7.png)");
        break;
    case 8:
        ui->label_1->setStyleSheet("border-image:url(:/source/number/8.png)");
        break;
    case 9:
        ui->label_1->setStyleSheet("border-image:url(:/source/number/9.png)");
        break;
    default:
        break;
    }
    if(num<10)
    {
        ui->label_3->move(64,0);
        ui->label_2->hide();
        ui->label_1->hide();

    }
    else if(num >=10 && num <100)
    {
        ui->label_2->show();
        ui->label_1->hide();
        ui->label_2->move(32,0);
        ui->label_3->move(96,0);
    }
    else
    {
        ui->label_1->show();
        ui->label_2->show();
        ui->label_1->move(0,0);
        ui->label_2->move(64,0);
        ui->label_3->move(128,0);
    }
}

在主程序中调用如下

number_center = new Number_1(ui->widget_center);
    number_center->setGeometry(0,0,192,72);
    number_center->show();

好了，这个速度显示的界面就搞定了