土木工程设计中的图形平台技术探索

Research on a Graphic Platform for the Design of Civil Engineering

土木工程设计行业有其自身的图形需求,本文提出其图形平台开发的若干技术问题,对图形平台模块化,并对各功能模块划分和联系进行了初步探讨。利用面向对象语言的继承性,建立了一套适用于图形平台的可扩展类库。根据所见即所得的原则,实现了基面定位的方法。利用OpenGL扩展缓冲区的功能实现了动态显示,并创建了一种压缩纹理的文件存储格式,运用该格式的文件可以加速纹理加载的速度。本文通过试验比较了Open-GL多重采样反走样和区域取样反走样两种方法的效果和速度,得到了多重采样反走样在总体性能上稍强的结论。利用Windows的对话框和文本控件实现了跟随鼠标移动的tip浮动框。在传统几何点捕捉的基础上,提出了状态捕捉的概念,扩展了捕捉的范围。在分析硬件发展和图形应用的基础上,提出了三维模型的应用趋势。

AEC（Architecture,Engineering and Constructions）Design has particular requirements for graph.The paper proposed several questions about graphic platform,made it modular,and took a preliminary study on the functional dividing and relations between different modules.Based on the inheritance of object-orient language,the paper built a class library which is fit for graphic platform.According to the principle of what you see is what you get,the paper implemented a base-face locating method.Using the OpenGL buffer extension,the paper implemented a method of dynamic displaying,and built a file format for compressed texture that can accelerate the process of texture bind.On the basis of testing,the paper compared the effect and speed of Multi-samples and Alpha on anti-aliasing,and concluded that Multi-samples has better performance than Alpha on anti-aliasing.The paper implemented a floating tip using Windows Dialog and text control,which can move the following mouse on the screen.State snap is risen which extends the scope of traditional snap.After analyzing the computer hardware and graphic applying,the paper concluded the application trend of 3D modeling.