QT QPainter C++测试源代码
资源内容介绍
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();}