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()

The QCursor class provides a mouse cursor with an arbitrary shape

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