建设银行悦生活网站,杭州百度seo优化,建站公司最新排名,wordpress 火车头接口项目中需要使用QT进行窗口自绘#xff0c;前期先做一下技术探索#xff0c;参考相关资料代码熟悉流程。本着代码是最好的老师原则#xff0c;在此记录一下。 目录 1.运行效果 2.代码结构 3.具体代码 1.运行效果 2.代码结构 3.具体代码 myspeed.pro QT core gui…项目中需要使用QT进行窗口自绘前期先做一下技术探索参考相关资料代码熟悉流程。本着代码是最好的老师原则在此记录一下。 目录 1.运行效果 2.代码结构 3.具体代码 1.运行效果 2.代码结构 3.具体代码 myspeed.pro QT core guigreaterThan(QT_MAJOR_VERSION, 4): QT widgetsCONFIG c17# You can make your code fail to compile if it uses deprecated APIs. # In order to do so, uncomment the following line. #DEFINES QT_DISABLE_DEPRECATED_BEFORE0x060000 # disables all the APIs deprecated before Qt 6.0.0SOURCES \drawdialog.cpp \main.cpp \meter1.cpp \meter2.cppHEADERS \drawdialog.h \meter1.h \meter2.h# Default rules for deployment. qnx: target.path /tmp/$${TARGET}/bin else: unix:!android: target.path /opt/$${TARGET}/bin !isEmpty(target.path): INSTALLS targetdrawdialog.h #include QDialogclass DrawDialog : public QDialog {Q_OBJECTpublic:explicit DrawDialog(QWidget *parent 0);void mousePressEvent(QMouseEvent *event);void mouseMoveEvent(QMouseEvent *event);void paintEvent(QPaintEvent *event) ;void keyPressEvent( QKeyEvent * event ); private:QPoint m_CurrentPos; };meter1.h #ifndef METER1_H #define METER1_H#include QWidget #include QMouseEvent// 仪表盘开发参考博客 // https://blog.csdn.net/yyz_1987/article/details/126958420#comments_29151980 class MyMeter1 : public QWidget {Q_OBJECTpublic:MyMeter1(QWidget *parent 0);~MyMeter1();void setValue(double val);protected:void paintEvent(QPaintEvent *);void drawCrown(QPainter *painter);void drawBackground(QPainter *painter);void drawScale(QPainter *painter);void drawScaleNum(QPainter *painter);void drawTitle(QPainter *painter);void drawIndicator(QPainter *painter);void drawNumericValue(QPainter *painter);protected:void mouseMoveEvent(QMouseEvent *event);void mousePressEvent(QMouseEvent *event);void mouseReleaseEvent(QMouseEvent *event);private:QPoint mousePoint;bool mouse_press;private:QColor m_background;QColor m_foreground;int m_maxValue;int m_minValue;int m_startAngle;int m_endAngle;int m_scaleMajor;int m_scaleMinor;double m_value;int m_precision;QTimer *m_updateTimer;QString m_units;QString m_title;public Q_SLOTS:void UpdateAngle();private:};#endif // METER1_Hmeter2.h #ifndef METER2_H #define METER2_H#include QWidgetclass MyMeter2 : public QWidget {Q_OBJECTpublic:MyMeter2(QWidget *parent nullptr);~MyMeter2();void paintEvent(QPaintEvent *event);void timerEvent(QTimerEvent *e);private:void drawFrame(QPainter *painter);void drawScale(QPainter *painter);void drawScaleNum(QPainter *painter);void drawPointer(QPainter *painter);void drawSpeed(QPainter *painter);void drawUnit(QPainter *painter);int speed;int time_id;int status;qreal m_angle;QColor m_foreground;int m_maxValue;int m_minValue;int m_startAngle;int m_endAngle;int m_scaleMajor;int m_scaleMinor;double m_value;int m_precision;//QTimer *m_updateTimer;QString m_units;QString m_title;}; #endif // METER2_Hdrawdialog.cpp #include drawdialog.h #include QWidget #include QMouseEvent #include QPainterDrawDialog::DrawDialog(QWidget *parent) : QDialog(parent){//让程序无边框setWindowFlags( Qt::FramelessWindowHint );//让程序背景透明setAttribute(Qt::WA_TranslucentBackground, true); }void DrawDialog::mousePressEvent(QMouseEvent *event) {//当鼠标左键按下时记录当前位置if(event-button() Qt::LeftButton){m_CurrentPos event-globalPos() - frameGeometry().topLeft();event-accept();}QDialog::mousePressEvent(event); }void DrawDialog::mouseMoveEvent(QMouseEvent *event) {//支持窗体移动if (event-buttons() Qt::LeftButton){move(event-globalPos() - m_CurrentPos);event-accept();}QDialog::mouseMoveEvent(event);}//绘制图形void DrawDialog::paintEvent(QPaintEvent *event){QPainter painter(this);//反走样painter.setRenderHint(QPainter::Antialiasing,true);painter.setPen( QPen(Qt::green, 2) );painter.setBrush( Qt::blue );QRect rect(10,10,200,260);//绘制一个椭圆painter.drawEllipse(rect);}void DrawDialog::keyPressEvent( QKeyEvent * event ) {//按下esc键时关闭if(event-key() Qt::Key_Escape){close();} }meter1.cpp #include meter1.h#include QPainter// 构造函数 MyMeter1::MyMeter1(QWidget *parent){m_background Qt::black;m_foreground Qt::white;m_startAngle 60;m_endAngle 60;m_scaleMajor 10;m_minValue 0;m_maxValue 100;m_scaleMajor 10;//分度m_scaleMinor 10;m_units L/min;m_title 仪表盘;m_precision 0;m_value 0;mouse_press false;setWindowFlags(Qt::FramelessWindowHint);//无窗体setAttribute(Qt::WA_TranslucentBackground);//背景透明resize(500, 500);}MyMeter1::~MyMeter1() {}void MyMeter1::setValue(double val) {m_value val; } //绘制表冠 void MyMeter1::drawCrown(QPainter *painter) {painter-save();int radius 100;QLinearGradient lg1(0, -radius, 0, radius);lg1.setColorAt(0, Qt::white); //设置渐变的颜色和路径比例lg1.setColorAt(1, Qt::gray); //只是粗略的颜色具体的可以参考RGB颜色查询对照表painter-setBrush(lg1); // 创建QBrush对象,把这个渐变对象传递进去painter-setPen(Qt::NoPen); //边框线无色painter-drawEllipse(-radius, -radius, radius 1, radius 1);painter-setBrush(m_background Qt::black);painter-drawEllipse(-92, -92, 184, 184);painter-restore(); }//绘制刻度数字 void MyMeter1::drawScaleNum(QPainter *painter) {painter-save();painter-setPen(m_foreground);//m_startAngle是起始角度m_endAngle是结束角度m_scaleMajor在一个量程中分成的刻度数double startRad ( 270-m_startAngle) * (3.14 / 180);double deltaRad (360 - m_startAngle - m_endAngle) * (3.14 / 180) / m_scaleMajor;double sina,cosa;int x, y;QFontMetricsF fm(this-font());double w, h, tmpVal;QString str;for (int i 0; i m_scaleMajor; i){sina sin(startRad - i * deltaRad);cosa cos(startRad - i * deltaRad);tmpVal 1.0 * i *((m_maxValue - m_minValue) / m_scaleMajor) m_minValue;// tmpVal 50;str QString( %1 ).arg(tmpVal); //%1作为占位符 arg()函数比起 sprintf()来是类型安全的w fm.size(Qt::TextSingleLine,str).width();h fm.size(Qt::TextSingleLine,str).height();x 82 * cosa - w / 2;y -82 * sina h / 4;painter-drawText(x, y, str); //函数的前两个参数是显示的坐标位置后一个是显示的内容是字符类型}painter-restore(); }// 绘制刻度线 void MyMeter1::drawScale(QPainter *painter) //绘制刻度线 {painter-save();painter-rotate(m_startAngle);int steps (m_scaleMajor * m_scaleMinor); //相乘后的值是分的份数double angleStep (360.0 - m_startAngle - m_endAngle) / steps; //每一个份数的角度// painter-setPen(m_foreground); //m_foreground是颜色的设置// QPen pen painter-pen(); //第一种方法QPen pen ;pen.setColor(Qt::green); //推荐使用第二种方式for (int i 0; i steps; i){if (i % m_scaleMinor 0)//整数刻度显示加粗{pen.setWidth(1); //设置线宽painter-setPen(pen); //使用面向对象的思想把画笔关联上画家。通过画家画出来painter-drawLine(0, 62, 0, 72); //两个参数应该是两个坐标值}else{pen.setWidth(0);painter-setPen(pen);painter-drawLine(0, 67, 0, 72);}painter-rotate(angleStep);}painter-restore(); }void MyMeter1::drawTitle(QPainter *painter) {painter-save();painter-setPen(m_foreground);//painter-setBrush(m_foreground);QString str(m_title); //显示仪表的功能QFontMetricsF fm(this-font());double w fm.size(Qt::TextSingleLine,str).width();painter-drawText(-w / 2, -30, str);painter-restore(); }// 显示的单位与数值 void MyMeter1::drawNumericValue(QPainter *painter) {QString str QString(%1 %2).arg(m_value, 0, f, m_precision).arg(m_units);QFontMetricsF fm(font());double w fm.size(Qt::TextSingleLine,str).width();painter-setPen(m_foreground);painter-drawText(-w / 2, 42, str); }void MyMeter1::UpdateAngle() {update(); }// 绘制表针和中心点 void MyMeter1::drawIndicator(QPainter *painter) {painter-save();QPolygon pts;pts.setPoints(3, -2, 0, 2, 0, 0, 60); /* (-2,0)/(2,0)/(0,60) *///第一个参数是 坐标的个数。后边的是坐标painter-rotate(m_startAngle);double degRotate (360.0 - m_startAngle - m_endAngle) / (m_maxValue - m_minValue)*(m_value - m_minValue);//画指针painter-rotate(degRotate); //顺时针旋转坐标系统QRadialGradient haloGradient(0, 0, 60, 0, 0); //辐射渐变haloGradient.setColorAt(0, QColor(60, 60, 60));haloGradient.setColorAt(1, QColor(160, 160, 160)); //灰painter-setPen(Qt::white); //定义线条文本颜色 设置线条的颜色painter-setBrush(haloGradient);//刷子定义形状如何填满 填充后的颜色painter-drawConvexPolygon(pts); //这是个重载函数绘制多边形。painter-restore();//画中心点QColor niceBlue(150, 150, 200);QConicalGradient coneGradient(0, 0, -90.0); //角度渐变coneGradient.setColorAt(0.0, Qt::darkGray);coneGradient.setColorAt(0.2, niceBlue);coneGradient.setColorAt(0.5, Qt::white);coneGradient.setColorAt(1.0, Qt::darkGray);painter-setPen(Qt::NoPen); //没有线填满没有边界painter-setBrush(coneGradient);painter-drawEllipse(-5, -5, 10, 10); }// 重绘函数 void MyMeter1 ::paintEvent(QPaintEvent *) {int widththis-width();int heightthis-height();QPainter painter(this);//一个类中的this表示一个指向该类自己的指针painter.setRenderHint(QPainter::Antialiasing); /* 使用反锯齿(如果可用) */painter.translate(width/2, height/2); /* 坐标变换为窗体中心 */int side qMin(width, height);painter.scale(side / 200.0, side / 200.0); /* 比例缩放 */drawCrown(painter); /* 画表盘边框 */drawScaleNum(painter); /* 画刻度数值值 */drawScale(painter); /* 画刻度线 */drawTitle(painter); /* 画单位 */drawNumericValue(painter); /* 画数字显示 */drawIndicator(painter); /* 画表针 */}void MyMeter1::mousePressEvent(QMouseEvent *event){if( (event-button() Qt::LeftButton) ){mouse_press true;mousePoint event-globalPos() - this-pos();// event-accept();}else if(event-button() Qt::RightButton){//如果是右键this-close();} }void MyMeter1::mouseMoveEvent(QMouseEvent *event) {// if(event-buttons() Qt::LeftButton){ //如果这里写这行代码拖动会有点问题if(mouse_press){move(event-globalPos() - mousePoint); // event-accept();} }void MyMeter1::mouseReleaseEvent(QMouseEvent *event) {mouse_press false; }meter2.cpp #include meter2.h#include QPainter #include QBrush #include QLabel #include QTimerEvent #include QLinearGradient #include QFont#include QtMathMyMeter2::MyMeter2(QWidget *parent): QWidget(parent) {//resize(800, 480);//setWindowTitle(test);m_foreground Qt::red;//Qt::black;speed 0;status 0;m_startAngle 45;m_endAngle 45;m_minValue 0;m_maxValue 100;m_scaleMajor 10;//分度m_scaleMinor 10;m_units KM/H;m_title My Speed;m_precision 0;m_value 0;m_angle (qreal)270/(m_maxValue-1);//setWindowFlags(Qt::FramelessWindowHint);//无窗体//setAttribute(Qt::WA_TranslucentBackground);//背景透明time_id this-startTimer(50); }MyMeter2::~MyMeter2() { }void MyMeter2::paintEvent(QPaintEvent *event) {int widththis-width();int heightthis-height();QPainter painter(this);painter.translate(width/2, height/2);int side qMin(width, height);painter.scale(side / 200.0, side / 200.0); /* 比例缩放 */drawFrame(painter);drawScale(painter); /* 画刻度线 */drawScaleNum(painter); /* 画刻度数值值 */drawUnit(painter);drawPointer(painter);drawSpeed(painter); }void MyMeter2::drawFrame(QPainter *painter) {painter-save();// 半径100int radius 100;painter-setBrush(QBrush(QColor(0, 255, 0, 255), Qt::SolidPattern));painter-drawArc(-radius, -radius, radius1, radius1, -135*16, -270*16);painter-restore();}// 绘制刻度线 void MyMeter2::drawScale(QPainter *painter) {painter-save();painter-rotate(m_startAngle);int steps (m_scaleMajor * m_scaleMinor); //相乘后的值是分的份数double angleStep (360.0 - m_startAngle - m_endAngle) / steps; //每一个份数的角度// painter-setPen(m_foreground); //m_foreground是颜色的设置// QPen pen painter-pen(); //第一种方法QPen pen ;pen.setColor(m_foreground); //推荐使用第二种方式for (int i 0; i steps; i){if (i % m_scaleMinor 0)//整数刻度显示加粗{pen.setWidth(1); //设置线宽painter-setPen(pen); //使用面向对象的思想把画笔关联上画家。通过画家画出来painter-drawLine(0, 90, 0, 100); //两个参数应该是两个坐标值}else{pen.setWidth(0);painter-setPen(pen);painter-drawLine(0, 95, 0, 100);}painter-rotate(angleStep);}painter-restore(); } // 绘制刻度 void MyMeter2::drawScaleNum(QPainter *painter) {painter-save();painter-setPen(m_foreground);//m_startAngle是起始角度m_endAngle是结束角度m_scaleMajor在一个量程中分成的刻度数double startRad ( 270-m_startAngle) * (3.14 / 180);double deltaRad (360 - m_startAngle - m_endAngle) * (3.14 / 180) / m_scaleMajor;double sina,cosa;int x, y;QFontMetricsF fm(this-font());double w, h, tmpVal;QString str;for (int i 0; i m_scaleMajor; i){sina sin(startRad - i * deltaRad);cosa cos(startRad - i * deltaRad);tmpVal 1.0 * i *((m_maxValue - m_minValue) / m_scaleMajor) m_minValue;// tmpVal 50;str QString( %1 ).arg(tmpVal); //%1作为占位符 arg()函数比起 sprintf()来是类型安全的w fm.size(Qt::TextSingleLine,str).width();h fm.size(Qt::TextSingleLine,str).height();x 82 * cosa - w / 2;y -82 * sina h / 4;painter-drawText(x, y, str); //函数的前两个参数是显示的坐标位置后一个是显示的内容是字符类型}painter-restore(); }void MyMeter2::drawPointer(QPainter *painter) {int radius 100;QPoint point[4] {QPoint(0, 10),QPoint(-10, 0),QPoint(0, -80),QPoint(10, 0),};painter-save();QLinearGradient linear;linear.setStart(-radius, -radius);linear.setFinalStop(radius1, radius1);linear.setColorAt(0, QColor(0, 255, 255, 0));linear.setColorAt(1, QColor(0, 255, 255, 255));painter-setPen(Qt::NoPen);painter-setBrush(linear);painter-drawPie(-radius, -radius, radius1, radius1, 225 * 16, -(m_angle * this-speed) * 16);painter-restore();painter-save();painter-setBrush(QBrush(QColor(0, 0, 0, 255), Qt::SolidPattern));painter-rotate(-135 this-speed * m_angle);painter-drawPolygon(point, 4);painter-restore(); }void MyMeter2::drawSpeed(QPainter *painter) {painter-save();painter-setPen(QColor(#0));// 绘制速度QFont font(Times, 10, QFont::Bold);font.setBold(true);font.setPixelSize(46);painter-setFont(font);painter-drawText(-60, 0, 120, 92, Qt::AlignCenter, QString::number(speed));painter-restore(); }void MyMeter2::drawUnit(QPainter *painter) {QString str QString(%1).arg(m_units);QFontMetricsF fm(font());double w fm.size(Qt::TextSingleLine,str).width();painter-setPen(m_foreground);painter-drawText(-w / 2, 82, str); }void MyMeter2::timerEvent(QTimerEvent *e) {int timerId e-timerId();if(this-time_id timerId) {if(this-status 0) {this-speed 1;if(this-speed m_maxValue)this-status 1;}else {this-speed - 1;if(this-speed 0)this-status 0;}this-update();} } main.cpp #include mainwindow.h #include meter1.h #include meter2.h #include drawdialog.h #include QApplicationint main(int argc, char *argv[]) {QApplication a(argc, argv);MyMeter1 w1;w1.setValue(33.12);w1.show();MyMeter2 w2;w2.show();DrawDialog w3;w3.show();return a.exec(); }