Qt使用QPainter绘制矢量图并保存为svg文件

位图和矢量图：

Bitmap:

• Usually a larger file size
• Cannot be enlarged into a higher resolution as the image quality will be affected
• Used to display complex images with many colors, such as photographs

Vector:

• Very small in file size
• Graphics can be resized without affecting the image quality
• Only a limited amount of color can be applied to each shape (single color, gradient, or pattern)
• Complex shapes require high-processing power to be generated

新建基于Widget的应用程序，继承于QMainWindow

 MainWindow.h

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

#ifndef  MAINWINDOW_H #define  MAINWINDOW_H #include  <QMainWindow> #include  <QPainter> #include  <QMenuBar> #include  <QtSvg/QSvgGenerator> #include  <QFileDialog> class  MainWindow :  public  QMainWindow {     Q_OBJECT public :     MainWindow(QWidget *parent =  0 );     ~MainWindow();      virtual