Qt 汽车仪表 QWidget

今天是2016年的最后一个工作日，在这个最后工作日里面，和以为网友要了一点练手的素材文件，经过网友确认，不涉及商业机密，在这里分享一下，如侵权，请联系我删除、

先上程序运行图

这里显示数字，闪烁等都没有问题，唯一的问题就是这个速度指针的绘制问题，在代码中我使用的是用QPainter绘制image。锯齿好严重，这里我已经开了抗锯齿

painter.setRenderHint(QPainter::Antialiasing,true);

但是效果几乎没有，是操作不对，还是需要特殊设置了

剩下的就是分享代码了

首先就是这个指针的绘制代码

ui->label->setStyleSheet("border-image:url(:/source/beijing.bmp)");
    ui->label->installEventFilter(this);
    image_pointer.load(":/source/222.png");

这里主要就是设置大背景，就是后面的那么最大的仪表界面，剩下的就是为这个要在Qlabel上面绘制指针，需要为QLabel注册绘制事件，否则程序会滤掉这个绘制事件

绘制指针代码

void Widget::painter_car()
{
    QPainter painter(ui->label);
    painter.setRenderHint(QPainter::Antialiasing,true);
    painter.translate(960,360);
    painter.save();
    painter.rotate(pointer_number);
    QRectF target(-40,-267.0,80.0,336.0);
    QRectF source(0.0,0.0,80.0,336.0);
    painter.drawImage(target,image_pointer,source);


    painter.restore();

}

这里新建Qpainter继承值Qlabel

设置开抗锯齿，几乎没有效果，我都怀疑执行了没有

移动Qpainter 的原始坐标点

完了就是简单的绘制 ， 

剩下的就是数字仪表的显示

这里我新建了一个专门显示数字的界面

这个几面来负责显示七位数字

数字显示源代码：

头文件

#ifndef NUMBER_H
#define NUMBER_H

#include <QWidget>

namespace Ui {
class Number;
}

class Number : public QWidget
{
    Q_OBJECT

public:
    explicit Number(QWidget *parent = 0);
    ~Number();
    void set_Number(int number);

private:
    void set_image(int flag,int number);
private:
    Ui::Number *ui;
};

#endif // NUMBER_H

源文件

#include "number.h"
#include "ui_number.h"
#include <QDebug>
Number::Number(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Number)
{
    ui->setupUi(this);
}

Number::~Number()
{
    delete ui;
}

void Number::set_Number(int number)
{
    if(number==0)
    {
        set_image(1,0);
    }
    set_image(1,number%10);
    if(number/10>0)
    {
        set_image(2,number/10);
    }
    if(number/100>0)
    {
        set_image(3,number/100);
    }
    if(number/1000>0)
    {
        set_image(4,number/1000);
    }
    if(number/10000>0)
    {
        set_image(5,number/10000);
    }
    if(number/100000>0)
    {
        set_image(6,number/100000);
    }
    if(number/1000000>0)
    {
        set_image(7,number/1000000);
    }

}

void Number::set_image(int flag, int number)
{
    switch (flag) {
    case 1:
        switch (number) {
        case 0:
            ui->label->setStyleSheet("border-image:url(:/source/0.png)");
            break;
        case 1:
            ui->label->setStyleSheet("border-image:url(:/source/1.png)");
            break;
        case 2:
            ui->label->setStyleSheet("border-image:url(:/source/2.png)");
            break;
        case 3:
            ui->label->setStyleSheet("border-image:url(:/source/3.png)");
            break;
        case 4:
            ui->label->setStyleSheet("border-image:url(:/source/4.png)");
            break;
        case 5:
            ui->label->setStyleSheet("border-image:url(:/source/5.png)");
            break;
        case 6:
            ui->label->setStyleSheet("border-image:url(:/source/6.png)");
            break;
        case 7:
            ui->label->setStyleSheet("border-image:url(:/source/7.png)");
            break;
        case 8:
            ui->label->setStyleSheet("border-image:url(:/source/8.png)");
            break;
        case 9:
            ui->label->setStyleSheet("border-image:url(:/source/9.png)");
            break;
        }
        break;
    case 2:
        switch (number) {
        case 0:
            ui->label_2->setStyleSheet("border-image:url(:/source/0.png)");
            break;
        case 1:
            ui->label_2->setStyleSheet("border-image:url(:/source/1.png)");
            break;
        case 2:
            ui->label_2->setStyleSheet("border-image:url(:/source/2.png)");
            break;
        case 3:
            ui->label_2->setStyleSheet("border-image:url(:/source/3.png)");
            break;
        case 4:
            ui->label_2->setStyleSheet("border-image:url(:/source/4.png)");
            break;
        case 5:
            ui->label_2->setStyleSheet("border-image:url(:/source/5.png)");
            break;
        case 6:
            ui->label_2->setStyleSheet("border-image:url(:/source/6.png)");
            break;
        case 7:
            ui->label_2->setStyleSheet("border-image:url(:/source/7.png)");
            break;
        case 8:
            ui->label_2->setStyleSheet("border-image:url(:/source/8.png)");
            break;
        case 9:
            ui->label_2->setStyleSheet("border-image:url(:/source/9.png)");
            break;
        }
        break;
    case 3:
        switch (number) {
        case 0:
            ui->label_3->setStyleSheet("border-image:url(:/source/0.png)");
            break;
        case 1:
            ui->label_3->setStyleSheet("border-image:url(:/source/1.png)");
            break;
        case 2:
            ui->label_3->setStyleSheet("border-image:url(:/source/2.png)");
            break;
        case 3:
            ui->label_3->setStyleSheet("border-image:url(:/source/3.png)");
            break;
        case 4:
            ui->label_3->setStyleSheet("border-image:url(:/source/4.png)");
            break;
        case 5:
            ui->label_3->setStyleSheet("border-image:url(:/source/5.png)");
            break;
        case 6:
            ui->label_3->setStyleSheet("border-image:url(:/source/6.png)");
            break;
        case 7:
            ui->label_3->setStyleSheet("border-image:url(:/source/7.png)");
            break;
        case 8:
            ui->label_3->setStyleSheet("border-image:url(:/source/8.png)");
            break;
        case 9:
            ui->label_3->setStyleSheet("border-image:url(:/source/9.png)");
            break;
        }
        break;
    case 4:
        switch (number) {
        case 0:
            ui->label_4->setStyleSheet("border-image:url(:/source/0.png)");
            break;
        case 1:
            ui->label_4->setStyleSheet("border-image:url(:/source/1.png)");
            break;
        case 2:
            ui->label_4->setStyleSheet("border-image:url(:/source/2.png)");
            break;
        case 3:
            ui->label_4->setStyleSheet("border-image:url(:/source/3.png)");
            break;
        case 4:
            ui->label_4->setStyleSheet("border-image:url(:/source/4.png)");
            break;
        case 5:
            ui->label_4->setStyleSheet("border-image:url(:/source/5.png)");
            break;
        case 6:
            ui->label_4->setStyleSheet("border-image:url(:/source/6.png)");
            break;
        case 7:
            ui->label_4->setStyleSheet("border-image:url(:/source/7.png)");
            break;
        case 8:
            ui->label_4->setStyleSheet("border-image:url(:/source/8.png)");
            break;
        case 9:
            ui->label_4->setStyleSheet("border-image:url(:/source/9.png)");
            break;
        }
        break;
    case 5:
        switch (number) {
        case 0:
            ui->label_5->setStyleSheet("border-image:url(:/source/0.png)");
            break;
        case 1:
            ui->label_5->setStyleSheet("border-image:url(:/source/1.png)");
            break;
        case 2:
            ui->label_5->setStyleSheet("border-image:url(:/source/2.png)");
            break;
        case 3:
            ui->label_5->setStyleSheet("border-image:url(:/source/3.png)");
            break;
        case 4:
            ui->label_5->setStyleSheet("border-image:url(:/source/4.png)");
            break;
        case 5:
            ui->label_5->setStyleSheet("border-image:url(:/source/5.png)");
            break;
        case 6:
            ui->label_5->setStyleSheet("border-image:url(:/source/6.png)");
            break;
        case 7:
            ui->label_5->setStyleSheet("border-image:url(:/source/7.png)");
            break;
        case 8:
            ui->label_5->setStyleSheet("border-image:url(:/source/8.png)");
            break;
        case 9:
            ui->label_5->setStyleSheet("border-image:url(:/source/9.png)");
            break;
        }
        break;
    case 6:
        switch (number) {
        case 0:
            ui->label_6->setStyleSheet("border-image:url(:/source/0.png)");
            break;
        case 1:
            ui->label_6->setStyleSheet("border-image:url(:/source/1.png)");
            break;
        case 2:
            ui->label_6->setStyleSheet("border-image:url(:/source/2.png)");
            break;
        case 3:
            ui->label_6->setStyleSheet("border-image:url(:/source/3.png)");
            break;
        case 4:
            ui->label_6->setStyleSheet("border-image:url(:/source/4.png)");
            break;
        case 5:
            ui->label_6->setStyleSheet("border-image:url(:/source/5.png)");
            break;
        case 6:
            ui->label_6->setStyleSheet("border-image:url(:/source/6.png)");
            break;
        case 7:
            ui->label_6->setStyleSheet("border-image:url(:/source/7.png)");
            break;
        case 8:
            ui->label_6->setStyleSheet("border-image:url(:/source/8.png)");
            break;
        case 9:
            ui->label_6->setStyleSheet("border-image:url(:/source/9.png)");
            break;
        }
        break;
    case 7:
        switch (number) {
        case 0:
            ui->label_7->setStyleSheet("border-image:url(:/source/0.png)");
            break;
        case 1:
            ui->label_7->setStyleSheet("border-image:url(:/source/1.png)");
            break;
        case 2:
            ui->label_7->setStyleSheet("border-image:url(:/source/2.png)");
            break;
        case 3:
            ui->label_7->setStyleSheet("border-image:url(:/source/3.png)");
            break;
        case 4:
            ui->label_7->setStyleSheet("border-image:url(:/source/4.png)");
            break;
        case 5:
            ui->label_7->setStyleSheet("border-image:url(:/source/5.png)");
            break;
        case 6:
            ui->label_7->setStyleSheet("border-image:url(:/source/6.png)");
            break;
        case 7:
            ui->label_7->setStyleSheet("border-image:url(:/source/7.png)");
            break;
        case 8:
            ui->label_7->setStyleSheet("border-image:url(:/source/8.png)");
            break;
        case 9:
            ui->label_7->setStyleSheet("border-image:url(:/source/9.png)");
            break;
        }
        break;

    }
}

这里代码开着有点多，其实没有什么含量，说白了就是给七个QLabel换背景

使用情况

    number_1 = new Number(ui->widget_1);
    number_1->resize(175,32);
    number_1->move(0,0);
    number_1->set_Number(temp);
    number_1->show();

    number_2 = new Number(ui->widget_2);
    number_2->resize(175,32);
    number_2->move(0,0);
    number_2->set_Number(temp);
    number_2->show();

    number_3 = new Number(ui->widget_3);
    number_3->resize(175,32);
    number_3->move(0,0);
    number_3->set_Number(temp);
    number_3->show();

    number_4 = new Number(ui->widget_4);
    number_4->resize(175,32);
    number_4->move(0,0);
    number_4->set_Number(temp);
    number_4->show();

    number_5 = new Number(ui->widget_5);
    number_5->resize(175,32);
    number_5->move(0,0);
    number_5->set_Number(temp);
    number_5->show();

    number_6 = new Number(ui->widget_6);
    number_6->resize(175,32);
    number_6->move(0,0);
    number_6->set_Number(temp);
    number_6->show();

新建6个界面实例，

bool flag_pointer = true;
void Widget::timerout_poinyer()
{
    if(flag_pointer)
    {
        if(pointer_number<135)
        {
            ++pointer_number;
            if(pointer_number == 135)
            {
                flag_pointer = false;
            }
        }
    }
    else
    {
        if(pointer_number>-135)
        {
            --pointer_number;
            if(pointer_number == -135)
            {
                flag_pointer = true;
            }
        }
    }
    ++temp;
    if(temp>999999)
    {
        temp = 0;
    }
    number_1->set_Number(temp);
    number_2->set_Number(temp);
    number_3->set_Number(temp);
    number_4->set_Number(temp);
    number_5->set_Number(temp);
    number_6->set_Number(temp);
    this->update();
}

在这里来刷新指针和刷新数字界面的显示

大家可能看到图中有的界面是有那个没有系安全带的图标，有的有，这里是实现了一个1Hz的图标闪烁，其实原理很简单，就是QLabel的隐藏，显示，再隐藏，再显示。。。

实现代码：

void Widget::timeout_people()
{
    if(ui->label_people->isHidden())
    {
        ui->label_people->show();
    }
    else
    {
        ui->label_people->hide();
    }
}