qt 使用QPainter绘图

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QPainter 绘制一些简单的图形，也可以设置文字，设置笔，路径等。需要实现paintEvent这个方法，然后使用QPainter需要传入this指针，表示父类会调用。

#include "basicshapewindow.h"#include "ui_basicshapewindow.h"BasicShapeWindow::BasicShapeWindow(QWidget *parent) :    QMainWindow(parent),    ui(new Ui::BasicShapeWindow){    ui->setupUi(this);}void BasicShapeWindow::paintEvent(QPaintEvent *event){    QPainter textPainter(this);    textPainter.setFont(QFont("Times", 14, QFont::Bold));    textPainter.drawText(QPoint(40, 60), "Testing");    QPainter linePainter(this);    linePainter.drawLine(QPoint(50, 60), QPoint(100, 100));    QPainter rectPainter(this);    rectPainter.setBrush(Qt::BDiagPattern);    rectPainter.drawRect(QRect(40, 120, 80, 130));    QPen ellipsePen;    ellipsePen.setColor(Qt::red);    ellipsePen.setStyle(Qt::DashDotLine);    QPainter ellipsePainter(this);    ellipsePainter.setPen(ellipsePen);    ellipsePainter.drawEllipse(QPoint(200, 100), 150, 70);    QPainterPath rectPath;    rectPath.addRect(QRect(150, 60, 100, 50));    QPainter pathPainter(this);    pathPainter.setPen(QPen(Qt::red, 3, Qt::DashDotLine, Qt::FlatCap, Qt::MiterJoin));    pathPainter.setBrush(Qt::yellow);    pathPainter.drawPath(rectPath);    QPainterPath ellipsePath;    ellipsePath.addEllipse(QPoint(200, 120), 50, 120);    QPainter ellipsePathPainter(this);    ellipsePathPainter.setPen(QPen(QColor(79, 106, 25), 5,                                            Qt::SolidLine, Qt::FlatCap, Qt::MiterJoin));    ellipsePathPainter.setBrush(QColor(122, 163, 39));    ellipsePathPainter.drawPath(ellipsePath);    QImage image;    image.load(":/head.png");    QPainter imagePainter(this);    imagePainter.drawImage(QPoint(100, 150), image);}BasicShapeWindow::~BasicShapeWindow(){    delete ui;}

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