QT QPainter C++测试源代码 3.46KB

qq_42750170

资源文件列表:

QtPainterTest.zip 大约有5个文件

main.cpp 183B
mainwindow.cpp 3.46KB
mainwindow.h 558B
mainwindow.ui 10.16KB
QtPainterTest.pro 614B

资源介绍:

本C++代码用于测试QPainter的drawText函数

#include "mainwindow.h" #include "ui_mainwindow.h" #include <QPainter> #include <QTime> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow) { ui->setupUi(this); connect(ui->RectShowpushButton,&QPushButton::clicked,this,&MainWindow::onShowRectpushButtonClicked); connect(ui->TextShowpushButton,&QPushButton::clicked,this,&MainWindow::onShowTextpushButtonClicked); connect(ui->RectClearpushButton,&QPushButton::clicked,this,&MainWindow::toClearView); connect(ui->TextClearpushButton,&QPushButton::clicked,this,&MainWindow::toClearView); m_pPixmap=new QPixmap(800,800); m_pPixmap->fill(Qt::white); initView(); } MainWindow::~MainWindow() { delete ui; } void MainWindow::initView() { m_pPixmap=new QPixmap(800,800); m_pPixmap->fill(Qt::white); QPainter painter(m_pPixmap); painter.translate(400,400); QPen pen; pen.setWidth(1); // 设置线条宽度为1像素 // 可选：设置线条颜色、样式等 pen.setColor(Qt::black); // 设置线条颜色为黑色 pen.setStyle(Qt::DashLine); // 设置线条样式为短实线 painter.setPen(pen); painter.drawLine(0,-400,0,400); painter.drawLine(-400,0,400,0); painter.drawLine(100,1,100,5); painter.drawLine(1,100,5,100); painter.drawText(90,-2,"100"); painter.drawText(390,-2,"x"); painter.drawText(-23,105,"100"); painter.drawText(-10,395,"y"); painter.end(); ui->Viewlabel->setPixmap(*m_pPixmap); } void MainWindow::ShowLOG(QString log) { QString logs=ui->textBrowser->toPlainText(); logs=QTime::currentTime().toString("[hh:mm:ss.zzz]: ")+log+"\n"+logs; ui->textBrowser->clear(); ui->textBrowser->setPlainText(logs); } void MainWindow::onShowRectpushButtonClicked() { QPainter painter(m_pPixmap); painter.translate(400,400); QPen pen; pen.setWidth(1); // 设置线条宽度为1像素 // 可选：设置线条颜色、样式等 pen.setColor(Qt::blue); // 设置线条颜色为黑色 pen.setStyle(Qt::SolidLine); // 设置线条样式为实线 painter.setPen(pen); painter.drawRect(ui->RectXspinBox->value(),ui->RectYspinBox->value(), ui->RectWidthspinBox->value(),ui->RectHeightspinBox->value()); painter.end(); ui->Viewlabel->setPixmap(*m_pPixmap); } void MainWindow::onShowTextpushButtonClicked() { QFont font=ui->fontComboBox->currentFont(); font.setPointSize(ui->FontSizespinBox->value()); QFontMetrics fontMetrics(font); QRect textRect=fontMetrics.boundingRect(ui->TextlineEdit->text()); ShowLOG("QFontMetrics result:\ntext x pos:"+QString::number(textRect.x())+ "\ntext y pos:"+QString::number(textRect.y())+ "\ntext width:"+QString::number(textRect.width())+ "\ntext height:"+QString::number(textRect.height())); QPainter painter(m_pPixmap); painter.translate(400,400); QPen pen; pen.setWidth(1); // 设置线条宽度为1像素 // 可选：设置线条颜色、样式等 pen.setColor(Qt::red); // 设置线条颜色为黑色 pen.setStyle(Qt::SolidLine); // 设置线条样式为实线 painter.setPen(pen); painter.setFont(font); painter.drawText(ui->TextXspinBox->value(),ui->TextYspinBox->value(),ui->TextlineEdit->text()); painter.end(); ui->Viewlabel->setPixmap(*m_pPixmap); } void MainWindow::toClearView() { initView(); }

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