Overlap Operations and Raster Graphics

This paper outlines the development of a volume and surfaces modelling system for use with raster graphic displays. The ideas are presented in a historical framework to make the reasoning behind the design decisions clear and to indicate the main influences which have guided the work. There are two outcomes of importance: a language form for defining volumes and surfaces; and hardware to convert this representation directly into a display. The hardware provides hidden-line or hidden-area removal as a display primitive which, in an appropriate implementation, can be fast enough to support a range of real-time display applications. Linked to this hidden-line, hidden-area removal facility is an ability to provide interference tests for objects that are being moved around in a scene. Again there appears to be a hierarchy of applications ranging in complexity from interactive volume editing to robot control and vision systems. The new facilities complement existing point and line based display operations, on which most current displays' hardware is based. A good case is emerging for integrating the two approaches into a single hardware implementation for CAD workstations and for simulator display systems.     

Memory Design for Raster Graphics Displays

This tutorial examines the origin and nature of the problem of contention for memory cycles?a problem that impacts the image update performance of every raster graphics system.     

PERQ and Advanced Raster Graphics Workstations

A National Network of Inexpensive, High-Powered, Single-User Computers with Good Interactive Capabilities Is Being Launched in the UK.     

Increasing Capabilities in Interactive Computer Graphics Terminals

The earliest interactive computer graphics terminals were closely coupled to their central computers and placed heavy loads upon them for resource allocation. Two marked trends in the evolution of terminals have been a reduction of central computer load and exploitation of the increasing performance/cost ratio for terminal equipment. The trends have led to graphics terminals that operate on a stand-alone basis. The history of these trends is traced and particularly illustrated by the cases of the fully interactive, refreshed CRT GRAPHIC 21 and the simply interactive, storage CRT GRAPHIC 101 terminals.     

并行栅格扫描填充路径及其规划算法

深入分析快速成形制件翘曲变形的原因后,提出一种全新的扫描填充路径--并行栅格路径及其规划算法.按照这种路径能够近似、并行地完成整个待成形二维平面区域的扫描填充过程,在减小XY向温度梯度的同时,均匀化不同位置材料成形后的冷却收缩约束力,使得不同位置材料的冷却收缩趋于同步和均匀,减小了制件的整体翘曲变形量.实验表明,该算法能够在与其他类型路径的规划算法大致相当的时间和空间复杂度下,获得扫描填充性能更加优越的路径.     

Some Issues in Designing User Interfaces to 3D Raster Graphics

Now that raster graphics has become a common tool in CAD/CAM systems, animation and many other applications, the need has arisen for user interfaces to graphics packages for these new applications. On the basis of a typology of the users, an analysis is presented of some of the choices which have to be made in developing these interfaces.     

一种快速的复杂多边形匹配算法

提出了一种能够快速进行复杂形状多边形匹配的算法,该算法基于正切空间表示,先对复杂多边形进行离散曲线演化,再将得到的简化多边形分为一系列最大凸/凹弧线,并选择每段最大凸弧线的起点作为匹配的起始点进行匹配。实验结果证明该算法不但能够对复杂多边形快速而精确的匹配,而且具有不受噪声影响的优点。     

基于Matlab的图形轮廓提取及填充

提取图形的形状特征是当前图像处理领域的重要研究内容,而图形的边缘轮廓又能很好地反映形状的信息,因此本文阐述了如何利用matlab较好的提取图形的轮廓,以及将简单轮廓图形填充起来作为形状图形进行研究的算法及代码实现。     

基于MFC的DirectDraw高速图形绘制方法与应用

在工业控制环境下采用GDI内存作图方式可以加速图形绘制,但对复杂图形的高速绘制效果并不理想.提出以MFC编程来实现基于DirectDraw实时图形绘制方法,能产生快速、平稳的复杂图形,并且通过一个复杂图形绘制的实例,详细讨论了的步骤.     

用fBm法生成山脉地形的真实感图形的方法

介绍了fBm方法的基本原理和特点,给出了在三维空间中用中点偏移法生成山脉地形数据模型的算法,提出了一种基于OpenGL山脉地形真实感显示方法,并通过实例验证其科学性和可行性。     

在Authorware中实现建筑图形放大的三种方法

介绍了在Authorware实现图形放大的三种方法。阐述了每种方法的设计和实现方法，并将三种方法作了比较。     

二维复杂图形的一种近似覆盖方法

该文提出了一种用简单的矩形区域覆盖复杂的平面区域的方法,从而可以方便地判断一条轨迹与区域之间的拓扑关系。     

在Word文档中插入CAD图形方法的研究

在Word文档中插入CAD图形是工程领域中经常遇到的一个问题,如工厂、企业、院校中,工程技术人员采集数据绘制曲线图像、撰写论文等。现通行的,也是最简单方法是位图抓图法。通过对位图与矢量图两种格式的比较得出用矢量图格式插入CAD图形能更好的保留图形精度和效果。用矢量图格式插入法有内置与外置两种方法。     

Jag-Free Images on Raster Displays

A subpixel addressability feature allows this algorithm to address vector end points between pixel centers and helps it eliminate the Achilles' heel of raster displays?jaggies.     

基于OpenGL的自然景物的真实感绘制及其应用

随着图形学技术的快速发展。如何绘制非规则自然景物一直都是图形学的一个难点及热点问题。本文以植物的绘制为例，系统地总结了基于OpenGL技术实现真实感图形绘制的基本步骤和方法。     

用DELPHI处理图形数据库的方法

介绍了用Delphi建立和灵活访问数据库图形字段的二种方法。     

浅析《计算机图形学》中扫描线填充算法的讲授方法

针对<计算机图形学>中扫描线填充算法要点多、从思想到具体算法跨度大和数据结构较复杂等特点,用教育心理学理论指导实践,提供了一个从简单到复杂,逐步展开各个知识点,然后通过引导学生参与到授课中来的教学方法,顺利地达到了教学目的.