[Qt] Librecad 源码分析

libraries

• jwwlib
• libdxfrw：一个免费的C++库，用于读写文本格式或二进制格式的DXF文件（C++ library to read and write DXF/DWG files）
• muparser：一个跨平台的公式解析库，它可以自定义多参数函数，自定义常量、变量及一元前缀、后缀操作符，二元操作符等，它将公式编译成字节码，所以计算起来非常快

librecad

• src：源文件
  • action：动作类
  • cmd：命令行
  • lib：各种库
    • actions：处理各种响应事件
    • creation
    • debug
    • engine
    • fileio
    • filter
    • generators
    • gui：界面显示
    • information
    • math
    • modification
    • printing
    • scripting
  • main：启动程序和窗口
  • plugins：插件
  • test
  • ui：界面控制

qc_applicationwindow

 1 /**
 2  * Redraws all mdi windows.
 3  */
 4 void QC_ApplicationWindow::redrawAll()
 5 {
 6     if (mdiAreaCAD)
 7     {
 8         foreach (const QC_MDIWindow* win, window_list)
 9         {
10             if (win)
11             {
12                 QG_GraphicView* gv = win->getGraphicView();
13                 if (gv) {gv->redraw();}
14             }
15         }
16     }
17 }

\librecad\src\ui

qg_graphicView

updateGridStatusWidget()

1 /**
2  * Sets the text for the grid status widget in the left bottom corner.
3  */
4 void QG_GraphicView::updateGridStatusWidget(const QString& text)
5 {
6    emit gridStatusChanged(text);
7 }

wheelEvent()

1 /**
2  * mouse wheel event. zooms in/out or scrolls when
3  * shift or ctrl is pressed.
4  */
5 void QG_GraphicView::wheelEvent(QWheelEvent *e) {...}

\librecad\src\lib\gui

rs_graphicview

centerOffsetX()

 1 /**
 2  * Centers the drawing in x-direction.
 3  */
 4 void RS_GraphicView::centerOffsetX() {
 5     if (container && !zoomFrozen) {
 6         offsetX = (int)(((getWidth()-borderLeft-borderRight)
 7                          - (container->getSize().x*factor.x))/2.0
 8                         - (container->getMin().x*factor.x)) + borderLeft;
 9     }
10 }

zoomScroll()

 1 /**
 2  * Scrolls in the given direction.
 3  */
 4 void RS_GraphicView::zoomScroll(RS2::Direction direction) {
 5     switch (direction) {
 6     case RS2::Up:
 7         offsetY-=50;
 8         break;
 9     case RS2::Down:
10         offsetY+=50;
11         break;
12     case RS2::Right:
13         offsetX+=50;
14         break;
15     case RS2::Left:
16         offsetX-=50;
17         break;
18     }
19     adjustOffsetControls();
20     adjustZoomControls();
21     //    updateGrid();
22
23     redraw();
24 }

\librecad\src\actions

rs_actiondrawline()

<QCursor>

The QCursor class provides a mouse cursor with an arbitrary shape

<QDockWidget>

The QDockWidget class provides a widget that can be docked inside a QMainWindow or floated as a top-level window on the desktop

参考：

https://blog.csdn.net/Caoyang_He/article/details/80343945