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  • 2022-04-12 05:42
一个最基本的GIS,需要包含如下的组成部分:管理空间坐标数据的矢量图形系统,管理属性数据的数据库管理系统,以及实现矢量图形系统与数据库管理系统双向连接的连接系统以及空间分析功能等。 矢量图形系统是GIS的重要部分,也是开发GIS系统时的重点所在。一个基本的矢量图形系统一般需要如下的功能: 1.相对完善的图形元素,应具备处理点,线,面,网络等图形元素的能力,这类图形系统在很大程度上能够满足普通的管理型GIS的矢量图形系统的要求。提功矢量显示图形的功能在很大程度上能够改善矢量图形界面的质量。 2.相对完善的图形操作功能。应具备图形的放缩,移动等各种操作功能。 3.相对完善的图形输入和输出功能。应具备鼠标交互绘制功能,图形数据交互输入等功能。 4.定制和使用线形。 5.具有子图填充功能。 6.具有网络描述和处理能力。 7.具有图层,颜色,线形等的设置功能。 8.具有较大的存储容量。处理图形元素的容量应该能够达到一般实用要求。
======================================================================== MICROSOFT FOUNDATION CLASS LIBRARY : Draw ======================================================================== AppWizard has created this Draw application for you. This application not only demonstrates the basics of using the Microsoft Foundation classes but is also a starting point for writing your application. This file contains a summary of what you will find in each of the files that make up your Draw application. Draw.dsp This file (the project file) contains information at the project level and is used to build a single project or subproject. Other users can share the project (.dsp) file, but they should export the makefiles locally. Draw.h This is the main header file for the application. It includes other project specific headers (including Resource.h) and declares the CDrawApp application class. Draw.cpp This is the main application source file that contains the application class CDrawApp. Draw.rc This is a listing of all of the Microsoft Windows resources that the program uses. It includes the icons, bitmaps, and cursors that are stored in the RES subdirectory. This file can be directly edited in Microsoft Visual C++. Draw.clw This file contains information used by ClassWizard to edit existing classes or add new classes. ClassWizard also uses this file to store information needed to create and edit message maps and dialog data maps and to create prototype member functions. res\Draw.ico This is an icon file, which is used as the application's icon. This icon is included by the main resource file Draw.rc. res\Draw.rc2 This file contains resources that are not edited by Microsoft Visual C++. You should place all resources not editable by the resource editor in this file. ///////////////////////////////////////////////////////////////////////////// For the main frame window: MainFrm.h, MainFrm.cpp These files contain the frame class CMainFrame, which is derived from CMDIFrameWnd and controls all MDI frame features. res\Toolbar.bmp This bitmap file is used to create tiled images for the toolbar. The initial toolbar and status bar are constructed in the CMainFrame class. Edit this toolbar bitmap using the resource editor, and update the IDR_MAINFRAME TOOLBAR array in Draw.rc to add toolbar buttons. ///////////////////////////////////////////////////////////////////////////// For the child frame window: ChildFrm.h, ChildFrm.cpp These files define and implement the CChildFrame class, which supports the child windows in an MDI application. ///////////////////////////////////////////////////////////////////////////// AppWizard creates one document type and one view: DrawDoc.h, DrawDoc.cpp - the document These files contain your CDrawDoc class. Edit these files to add your special document data and to implement file saving and loading (via CDrawDoc::Serialize). DrawView.h, DrawView.cpp - the view of the document These files contain your CDrawView class. CDrawView objects are used to view CDrawDoc objects. res\DrawDoc.ico This is an icon file, which is used as the icon for MDI child windows for the CDrawDoc class. This icon is included by the main resource file Draw.rc. ///////////////////////////////////////////////////////////////////////////// Help Support: hlp\Draw.hpj This file is the Help Project file used by the Help compiler to create your application's Help file. hlp\*.bmp These are bitmap files required by the standard Help file topics for Microsoft Foundation Class Library standard commands. hlp\*.rtf This file contains the standard help topics for standard MFC commands and screen objects. ///////////////////////////////////////////////////////////////////////////// Other standard files: StdAfx.h, StdAfx.cpp These files are used to build a precompiled header (PCH) file named Draw.pch and a precompiled types file named StdAfx.obj. Resource.h This is the standard header file, which defines new resource IDs. Microsoft Visual C++ reads and updates this file. ///////////////////////////////////////////////////////////////////////////// Other notes: AppWizard uses "TODO:" to indicate parts of the source code you should add to or customize. If your application uses MFC in a shared DLL, and your application is in a language other than the operating system's current language, you will need to copy the corresponding localized resources MFC42XXX.DLL from the Microsoft Visual C++ CD-ROM onto the system or system32 directory, and rename it to be MFCLOC.DLL. ("XXX" stands for the language abbreviation. For example, MFC42DEU.DLL contains resources translated to German.) If you don't do this, some of the UI elements of your application will remain in the language of the operating system. /////////////////////////////////////////////////////////////////////////////