软件发布:'Home Planet Full Edition'

softhow 2000-08-28 10:01:00
软件下载,详细资料请访问:http://www.csdn.net/softs/softview.asp?ID=2554
软件简介:'是天文学和追踪卫星工具的一个完整集合。
这一程序允许你察看地球的形貌图,显示月球白天和晚上的区域与当前的相位,和所选地球卫星的位置。
可通过编辑为主行星生成形貌图的DLL 文件来定制和扩展地图。 '
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Preface This book comes to you as a result of the collaboration of two authors who became interested in the topic in very different ways. Hopefully our motivations will help you understand what we each bring to the book, and perhaps prove to be at least a little entertaining as well. Chris Jones started using XML several years ago, and began using Python more recently. As a consultant for major companies in the Seattle area, he first used XML as the core data format for web site content in a home-grown publishing system in 1997. But he really became an XML devotee when developing an open source engine, which eventually became the key technology for Planet 7 Technologies. As a consultant, he continues to use XML on an almost daily basis for everything from configuration files to document formats. Chris began dabbling in Python because he thought it was a clean, object-oriented alternative to Perl. A long-time Unix user (but one who frequently finds himself working with Windows in Seattle), he has grown accustomed to scripting languages that place the full Unix API in the hands of developers. Having used far too much Java and ASP in web development over the years, he found Python a refreshing way to keep object-orientation while still accessing Unix sockets and threads—all with the convenience of a scripting language. The combination of Python and XML brings great power to the developer. While XML is a potent technology, it requires the programmer to use objects, interfaces, and strings. Python does so as well, and therefore provides an excellent playpen for XML development. The number of XML tools for Python is growing all the time, and Chris can produce an XML solution in far less time using Python than he can with Java or C++. Of course, the cross-platform nature of Python keeps our work consistently usable whether we're developing on Windows, Linux, or a Unix variant—the combination of which we both seem to find powerful. Fred Drake

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