开始 汽车 智能 虚拟 仪表 1

用linux来做

优化启动时间

用qt做界面（后期用android）

用带can的开发平台

 

1.记录一个qt的paint（zz）

 

暂时还没有加进去定时器。笨就一个字。以后工作绝对不搞编程。

暂时还没有加进去定时器。笨就一个字。以后工作绝对不搞编程。analogclock.h#ifndef ANALOGCLOCK_H #define ANALOGCLOCK_H #include <QWidget> class AnalogClock : public QWidget {     Q_OBJECT public:     AnalogClock(QWidget *parent = 0); public slots:     void setValue(int);     void init(void); protected:     void paintEvent(QPaintEvent *event); int mValue; }; #endifanalogclock.cpp#include <QtGui> #include "analogclock.h" AnalogClock::AnalogClock(QWidget *parent)     : QWidget(parent) {      setWindowTitle(tr("Analog Clock"));     //设置标题      setFixedSize(QSize(500,500));           //固定大小 } void AnalogClock::init()                    //初始化指针 {    setValue(0); } void AnalogClock::paintEvent(QPaintEvent *) {//设置指针的关键点     static const QPoint hourHand[8] =     {         QPoint(4, -20),  QPoint(4, -60),         QPoint(1, -70),  QPoint(1, -80),  QPoint(-1, -80),  QPoint(-1, -70),         QPoint(-4, -60),  QPoint(-4,-20)     };// 设置颜色     QColor pointer(200,0,0);     QColor hourColor(255, 255, 255);     QColor minuteColor(255,122,29);     QColor textColor(255, 255, 255);     int side = qMin(width(), height());                //取最小值        QPainter painter(this);     painter.fillRect(rect(), QBrush(Qt::black));       //设置背景颜色     painter.translate(width() / 2, height() / 2);       //将二分之一宽和高设为原点            painter.scale(side / 300.0, side / 300.0);          //伸缩图片大小//设置指针笔形与填充颜色     painter.setPen(Qt::NoPen);     painter.setBrush(pointer);//设置时刻度     painter.save();     painter.setRenderHint(QPainter::Antialiasing,true);     painter.setPen(hourColor);     for (int i = 0; i < 9; ++i)    {         painter.drawLine(-53, 73, -62, 85);         painter.rotate(36.0);     }    painter.restore();//设置分刻度    painter.save();    painter.setRenderHint(QPainter::Antialiasing,true);    painter.setPen(minuteColor);     for (int j = 0; j < 8; ++j)    {   painter.drawLine(-73, 53, -85, 62);         painter.rotate(36.0);     }    painter.restore();//设置刻度值painter.setPen(textColor);painter.drawText(-61, 57,30, 30,         Qt::AlignHCenter | Qt::AlignTop,                              QString::number(0));//从（x,y）开始,高为30,宽为30painter.drawText(-90, 15,30, 30,         Qt::AlignHCenter | Qt::AlignTop,                              QString::number(10));painter.drawText(-90, -35,30, 30,         Qt::AlignHCenter | Qt::AlignTop,                              QString::number(20));painter.drawText(-62, -71,30, 30,         Qt::AlignHCenter | Qt::AlignTop,                              QString::number(30));painter.drawText(-15, -90,30, 30,         Qt::AlignHCenter | Qt::AlignTop,                              QString::number(40));painter.drawText(32, -71,30, 30,         Qt::AlignHCenter | Qt::AlignTop,                              QString::number(50));painter.drawText(62, -31,30, 30,         Qt::AlignHCenter | Qt::AlignTop,                              QString::number(60));painter.drawText(60, 20,30, 30,         Qt::AlignHCenter | Qt::AlignTop,                              QString::number(70));painter.drawText(35, 55,30, 30,         Qt::AlignHCenter | Qt::AlignTop,                              QString::number(80));//内圆      painter.save();      painter.setRenderHint(QPainter::Antialiasing,true);      painter.setPen(QPen(Qt::white,2,Qt::SolidLine));      painter.setBrush(QBrush(Qt::NoBrush));      painter.drawEllipse(-20,-20,40,40);      painter.restore();//画指针           painter.save();      painter.setPen(Qt::NoPen);      painter.setRenderHint(QPainter::Antialiasing,true);      painter.rotate(180+36+mValue*288/80);               painter.drawConvexPolygon(hourHand, 8);      painter.restore();//最外面圆弧    painter.save();    painter.setPen(QPen(Qt::red,3,Qt::SolidLine));    painter.setRenderHint(QPainter::Antialiasing,true);    painter.drawArc(-105,-105,210,210,-54*16,72*16);    painter.restore();    painter.save();    painter.setPen(QPen(Qt::yellow,3,Qt::SolidLine));    painter.setRenderHint(QPainter::Antialiasing,true);    painter.drawArc(-105,-105,210,210,18*16,144*16);    painter.restore();    painter.save();    painter.setPen(QPen(Qt::white,3,Qt::SolidLine));    painter.setRenderHint(QPainter::Antialiasing,true);    painter.drawArc(-105,-105,210,210,162*16,72*16);    painter.restore();//内圆内数字QFont font;font.setPointSize(12);setFont(font);painter.drawText(-13, -11,30, 30,         Qt::AlignHCenter | Qt::AlignTop,                              QString::number(mValue));}void AnalogClock::setValue(int newvalue){ mValue= newvalue; update();}mainwin.h #ifndef MAINWIN_H #define MAINWIN_H #include <QSlider> #include <QWidget>#include "analogclock.h" class MainWin: public QWidget {     Q_OBJECT public:     MainWin(QWidget *parent = 0); protected slots:     void doValueChanged();private: QSlider slider; AnalogClock clock;}; #endifmainwin.cpp#include <QHBoxLayout>#include <QTimer>#include "mainwin.h" MainWin::MainWin(QWidget *parent)     : QWidget(parent), slider(Qt::Vertical) {      slider.setRange(0,80); connect(&slider, SIGNAL(valueChanged(int)), &clock, SLOT(setValue(int))); QHBoxLayout* layout = new QHBoxLayout(this); layout->addWidget(&clock);  layout->addWidget(&slider);        QTimer::singleShot(0,&clock, SLOT(init()));   //调用初始化函数 }void MainWin::doValueChanged(){ clock.setValue(slider.value());}main.cpp#include <QApplication>#include "mainwin.h"#include "analogclock.h" int main(int argc, char *argv[]) {     QApplication app(argc, argv);     MainWin mw;     mw.show();     return app.exec(); }