一、安装MxDraw

参见笔者博文“FreeCAD二次开发：集成二维CAD控件MxDraw”所述的安装方法。

二、编译安装QGIS

参见笔者博文"Windows 10下编译安装QGIS"所述的编译安装方法。

二、集成方法

2.1 添加MxDrawView.ui文件

按照QGIS的管理，Qt ui文件可放到src/ui目录及其子目录下。因此，可将MxDrawView.ui拷贝到src/ui/gd目录下，并修改src/ui/CMakeLists.txt，

# ...

if (BUILD_GDGIS)
	file(GLOB GD_UIS "${CMAKE_CURRENT_SOURCE_DIR}/gd/*.ui")
endif()

if (BUILD_WITH_QT6)
  QT6_WRAP_UI(QGIS_UIS_H
    ${QGIS_UIS}
    ${SYMBOLLAYER_UIS}
    ${EDITORWIDGET_UIS}
    ${PAINTEFFECT_UIS}
    ${PROCESSING_UIS}
    ${AUTH_UIS}
    ${RASTER_UIS}
    ${STYLEDOCK_UIS}
    ${LAYOUT_UIS}
    ${MESH_UIS}
    ${POINTCLOUD_UIS}
    ${_3D_UIS}
    ${CALLOUT_UIS}
    ${LABELING_UIS}
    ${NUMERICFORMAT_UIS}
    ${ATTRIBUTEFORMCONFIG_UIS}
    ${GEOREFERENCER_UIS}
    ${ANNOTATION_UIS}
    ${SENSOR_UIS}
	${GD_UIS}
  )
else()
  QT5_WRAP_UI(QGIS_UIS_H
    ${QGIS_UIS}
    ${SYMBOLLAYER_UIS}
    ${EDITORWIDGET_UIS}
    ${PAINTEFFECT_UIS}
    ${PROCESSING_UIS}
    ${AUTH_UIS}
    ${RASTER_UIS}
    ${STYLEDOCK_UIS}
    ${LAYOUT_UIS}
    ${MESH_UIS}
    ${POINTCLOUD_UIS}
    ${_3D_UIS}
    ${CALLOUT_UIS}
    ${LABELING_UIS}
    ${NUMERICFORMAT_UIS}
    ${ATTRIBUTEFORMCONFIG_UIS}
    ${GEOREFERENCER_UIS}
    ${ANNOTATION_UIS}
    ${SENSOR_UIS}
	${GD_UIS}
  )
endif()

# ...

2.2 添加MxDrawView类

界面相关的代码放到src/gui目录下，将MxDrawView.h、MxDrawView.cpp拷贝到src/gui/gd目录下，并修改CMakeLists.txt文件

# ...

# sources for GDGIS
if (BUILD_GDGIS)

  set(GD_HDR_FILES
		gd/MxDrawview.h
	)

  set(GD_SRC_FILES
    gd/MxDrawview.cpp
  )

	SOURCE_GROUP("gd" FILES ${GD_HDR_FILES} ${GD_SRC_FILES})

  set(QGIS_GUI_HDRS
    ${QGIS_GUI_HDRS}
    ${GD_HDR_FILES}
  )

  set(QGIS_GUI_SRCS
    ${QGIS_GUI_SRCS}
    ${GD_SRC_FILES}
  )

endif()

# ...

# Link AxBase，AxContainer for GDGIS
if (BUILD_GDGIS)
  find_package(${QT_VERSION_BASE} COMPONENTS AxBase AxContainer REQUIRED)
  target_link_libraries(qgis_gui
    ${QT_VERSION_BASE}::AxBase
    ${QT_VERSION_BASE}::AxContainer
  )
endif()

2.3 实现MxDrawView类

仿照MxDrwa自带例子TestQtMxDraw，实现MxDrawView

#ifndef gd_MxDrawView_H
#define gd_MxDrawView_H

#include "qgis_gui.h"
#include <QMainWindow>

namespace gd
{
    class Ui_MxDrawView;

    class GUI_EXPORT MxDrawView : public QMainWindow
    {
        Q_OBJECT

    public:
        MxDrawView(QWidget* parent = nullptr, Qt::WindowFlags flags = Qt::WindowFlags());
        ~MxDrawView();

    protected Q_SLOTS:

    private slots:
        void on_pushButton_clicked();

        void on_axWidget_ImplementCommandEvent(int iCommandId);

    protected:
        Ui_MxDrawView* ui;

    };
} // namespace gd

#endif // gd_MxDrawView_H

#include "MxDrawView.h"
#include "ui_MxDrawView.h"

using namespace gd;

MxDrawView::MxDrawView(QWidget* parent, Qt::WindowFlags flags)
	: QMainWindow(parent, flags),
	ui(new Ui_MxDrawView)
{
	// Set up ui
	ui->setupUi(this);
	connect(ui->axWidget, SIGNAL(ImplementCommandEvent(int)), this, SLOT(on_axWidget_ImplementCommandEvent(int)));
}

MxDrawView::~MxDrawView()
{
}
void MxDrawView::on_pushButton_clicked()
{
	// 执行控件自定义命令函数，命令的id为2，这个id用户可以自己取任意数,可以理解为是给执行的命令一个编号.
	ui->axWidget->dynamicCall("DoCommand(const qint32&)", 2);
}

void MxDrawView::on_axWidget_ImplementCommandEvent(int iCommandId)
{

	if (iCommandId == 2)
	{
		// 调用控件打开函数，打开H:盘的1.dwg文件。
		std::string filename = "H:\\1.dwg";
		//ui->axWidget->dynamicCall("OpenDwgFile(const QString&)", "H:\\1.dwg");
		ui->axWidget->dynamicCall("OpenDwgFile(const QString&)", QString::fromUtf8(filename.c_str()));
	}

2.4 嵌入MxDrawView窗体

修改src/app/qgisapp.cpp，创建并嵌入MxFrawView窗体，

QgisApp::QgisApp( QSplashScreen *splash, bool restorePlugins, bool skipBadLayers, bool skipVersionCheck, const QString &rootProfileLocation, const QString &activeProfile, QWidget *parent, Qt::WindowFlags fl )
  : QMainWindow( parent, fl )
  , mSplash( splash )
{
//...
  mCentralContainer = new QStackedWidget;
  mCentralContainer->insertWidget(0, mMapCanvas);

#ifdef GDGIS
  QTabWidget* tabWidget = new QTabWidget;
  tabWidget->addTab(mCentralContainer, "Map");
  tabWidget->addTab(new gd::MxDrawView(), "CAD");
  centralLayout->addWidget(tabWidget, 0, 0, 2, 1);
#else
  mCentralContainer->insertWidget(1, mWelcomePage);
  centralLayout->addWidget(mCentralContainer, 0, 0, 2, 1);
#endif 

  mInfoBar->raise();
//...
}