Research And Design Of GIS Component Based On COM Theory And Technology

In the past few years, with the continual development of componential technology, componential software had been the first develop model in software industry. The high reusable ability of software component, has resolved the repeated design problem in deep grade, and has improved the efficiency of software design. As a member of software family, the develop model of GIS has become to COMGIS and WEBGIS gradually. There is great meaning of using component technology in the design of GIS.The paper based on component technology and COM, study and design the vector graph component, realize the function of vector graph, such as the input and output of map, the display of map, mutual plot with mouse, etc. in the process of independent study, the paper explore and perfect the design technology, realize software product which have independent copyright.After has ensured the integer frame and functional module of vector graph system component, this paper used Microsoft Visual C++ development environment, program and achieve ActiveX control. The paper use GIS vector graph component in an actual small GIS, which are provided with basic GIS functions. It prepares the matter for the following expansion and upgrade.