新增

#include <QtSvg/QSvgGenerator>

#include <QFileDialog>

QT += core gui svg

一些重要的標頭檔案以及宣告。

建立menu bar, 命名一個Save as SVG,新增一個slog，原始碼如下；

#include "basicshapewindow.h"
#include "ui_basicshapewindow.h"
#include <QtSvg/QSvgGenerator>
#include <QFileDialog>

BasicShapeWindow::BasicShapeWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::BasicShapeWindow)
{
    ui->setupUi(this);
}

void BasicShapeWindow::paintEvent(QPaintEvent *event)
{
    paintAll();
}

void BasicShapeWindow::paintAll(QSvgGenerator *generator)
{
    QPainter painter;
    if (generator)
        painter.begin(generator);
    else
        painter.begin(this);
    painter.setFont(QFont("Times", 14, QFont::Bold));
    painter.drawText(QPoint(20, 30), "Testing");

    painter.drawLine(QPoint(50, 60), QPoint(100, 100));
    painter.setBrush(Qt::BDiagPattern);
    painter.drawRect(QRect(40, 120, 80, 30));

    QPen ellipsePen;
    ellipsePen.setColor(Qt::red);
    ellipsePen.setStyle(Qt::DashDotLine);

    painter.setPen(ellipsePen);
    painter.drawEllipse(QPoint(80, 200), 50, 20);

    QPainterPath rectPath;
    rectPath.addRect(QRect(150, 20, 100, 50));

    painter.setPen(QPen(Qt::red, 1, Qt::DashDotLine, Qt::FlatCap, Qt::MiterJoin));
    painter.setBrush(Qt::yellow);
    painter.drawPath(rectPath);

    QPainterPath ellipsePath;
    ellipsePath.addEllipse(QPoint(200, 120), 50, 20);
    painter.setPen(QPen(QColor(79, 106, 25), 5, Qt::SolidLine, Qt::FlatCap, Qt::MiterJoin));
    painter.setBrush(QColor(122, 163, 39));
    painter.drawPath(ellipsePath);

    QImage image;
    image.load(":/head.png");
    painter.drawImage(QPoint(150, 150), image);
    painter.end();
}

BasicShapeWindow::~BasicShapeWindow()
{
    delete ui;
}

void BasicShapeWindow::on_actionSave_as_triggered()
{
    QString filePath = QFileDialog::getSaveFileName(this, "Save SVG", "", "SVG files (*.svg)");

    if (filePath == "")
        return ;
    QSvgGenerator generator;
    generator.setFileName(filePath);
    generator.setSize(QSize(this->width(), this->height()));
    generator.setViewBox(QRect(0, 0, this->width(), this->height()));
    generator.setTitle("SVG Example");
    generator.setDescription("This SVG file is generated by Qt.");
    paintAll(&generator);
}