共查询到20条相似文献，搜索用时 156 毫秒
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设计计算机辅助设计软件中对用户绘制图形进行裁剪切割显示的算法,将用户绘制的直线、圆及多边形图形以矢量方式存储在计算机中。采用射线法,先分别判断直线的两个端点以及圆心是否在多边形内,将裁剪的直线或任意图形的边线不在多边形内的部分用背景色重画而进行擦除,让包含在多边形内的部分显示出来,实现只将用户视窗内部的图形显示在窗口内,方便用户进行图形绘制和裁剪显示等,以推动计算机辅助设计相关软件的发展。 相似文献
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叶鹏 《宁波职业技术学院学报》2004,8(3):84-86
在多媒体软件设计中经常需要以特殊效果显示图形，以增强多媒体的表现力。各种效果的实现不仅取决于算法，还需要配合使用某些API函数。本文介绍了如何使用Windows API函数BitBlt实现各种图形特技效果的算法和VB程序实例。 相似文献
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为了减轻有限元前期数据整理工作,正确划分有限元网格,提出了三维有限元模型的网格图形显示算法及程序的实现. 相似文献
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为了减轻有限元前期数据整理工作，正确划分有限元网格，提出了三维有限元模型的网格图形显示算法及程序的实现。 相似文献
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计算机图形学是一门使用数学算法将图形转换为计算机显示器能够显示的栅格形式的学科,这门学科研究的主要内容是如何让计算机表示图形以及如何处理分析图形和显示。一般图形是由几何元素和非几何元素构成的,几何元素包括点线面和体,而非几何元素包括灰度、色彩和线型线宽等。计算机图形学的主要目的是用计算机生成优美的具有真实感的图形。计算机图形学的研究范围也很广,如计算机动画、实体造型、虚拟现实、曲线造型等。经过近几年发展,计算机图形学已经成为计算机科学的重要分支。 相似文献
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童均 《重庆职业技术学院学报》2014,(5):137-140
本篇文章对树型组织结构图进行了研究,找到图形的显示规律,推导出组织成员的位置计算公式。分析了组织机构信息的数据结构和存储结构,实现了位置计算公式向函数算法的转换,并在IE浏览器中运用Java Script语言的递归函数实现了树型组织结构图的显示。 相似文献
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徐莹 《绵阳师范学院学报》2012,31(5):81-83
光线跟踪算法是一种高度真实感的图形绘制技术,由于其算法简单,容易实现而备受人们的重视。但同时光线跟踪算法是一种点采样算法,因而不可避免地产生图形走样,本文在实验的基础上,提出一种改进的基于光线跟踪的图形反走样算法,即像素细分技术和滤波技术向结合的算法,该算法反走样效果非常好,真实感强,并且性能好。 相似文献
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K. G. Saw Omar Majid N. Abdul Ghani H. Atan R. M. Idrus Z. A. Rahman K. E. Tan 《British journal of educational technology : journal of the Council for Educational Technology》2008,39(3):475-485
This paper is a study on the interaction patterns of distance learners enrolled in the Mathematics and Physics programmes of Universiti Sains Malaysia in the videoconferencing learning environment (VCLE). Interaction patterns are analysed in six randomly chosen videoconferencing sessions within one academic year. The findings show there are more interactions in the graphics display mode than the video display mode. The graphics display mode, which involves the simultaneous interaction of the teacher, students and course materials, shows greater student engagement in the VCLE. The focus on a three-component interaction in distance learning differs from previous studies which looked at distinct types of two-component interactions. The types of communicative interaction, in particular the explanatory and cognitive types which are dominant in the graphics display mode, are discussed within the construct of learning. The higher number of teacher-initiated interactions may also imply that the teacher plays a crucial role in creating and maintaining a community of inquiry focused on exploring and developing content as well as giving feedback on concepts, ideas or solutions. 相似文献
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以TI公司生产的MSP430G2553作为控制器,利用人眼视觉暂留的生理特性,设计了一种新型线阵LED图文显示装置。通过电机带动一列16位LED高速旋转,而由单片机精确控制,实现字符、图形及简单动态画面的清晰显示,并可实时变更显示内容及显示方式。 相似文献
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目前市场上点阵式LED显示屏存在控制系统庞大、造价过高等缺点。通过线阵LED控制和电机驱动控制这两部分的设计,来完成基于STC12LE5A16S2单片机的旋转线阵LED图文显示装置的设计。经过软硬件调试,该装置实现了同心圆显示、中英文字符显示、指针式秒表显示、转速显示、各个显示状态无线遥控切换、LED的亮度根据环境光线调整等功能。经过测试秒表走完一圈误差为0．01秒,转速误差为5％。该显示装置电路简单、显示图形稳定清晰,克服了点阵式LED显示屏的不足。 相似文献
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杨宇 《南通职业大学学报》2004,18(4):40-42,46
XML在网络应用中起着越来越重要的作用。本文介绍了网络教学中最常用的两种XML应用：MathML和SVG，它们分别用来在网页中显示公式和图形；并重点介绍如何将这两种重要的XML应用正确地嵌入网页中，以便在通用的网络浏览器中显示公式和图形。 相似文献
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SimWall is a user-friendly, stereo tiled display wall system composed of 18 commodity projectors operated by a Linux graphics cluster. Collaborating together, these projectors work as a single logical display capable of giving a high-resolution show, large-scale, and passive stereo scene. In order to avoid tedious system setup and maintenance, software-based automatic geometry and photometric calibration are used. The software calibration is integrated to the system seamlessly by an on-card transform method and is transparent to users. To end-users, SimWall works just as a common PC, but provides super computing, rendering and displaying ability. In addition, SimWall has stereoscopic function that gives users a semi-immersive experience in polarized passive way. This paper presents system architecture, implementation, and other technical issues such as hardware constraints, projectors alignment, geometry and photometric calibration, implementation of passive stereo, and development of overall soft- ware environment. 相似文献
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基于Photoshop图库的建立 总被引：1，自引：0，他引：1
陶立方 《金华职业技术学院学报》2005,5(2):29-31,41
插图是科技期刊的重要组成部分，一幅合乎规范和出版要求的插图需要花费编辑许多时间和精力。许多已处理过的图稿，只要稍作修改就可以生成目标图，把这些图稿进行整理、保存，就能作为图库的必要组成部分；许多目标图只是几个简单图形的组合。可以把这些简单图形独立为图库的基本图元。分析了目标图的基本结构，提出了建立基于Photoshop下图库的基本方法：首先是基本图库的建立，然后把实际工作中处理过的图形作为图库的扩充元，使图库不断得到扩展：同时提出了几种切实可行的利用图库资源生成目标图的基本方法。 相似文献
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In two experiments, participants made inferences from weather maps, before and after they received instruction about relevant meteorological principles. Different versions of the maps showed either task-relevant information alone, or both task-relevant and task-irrelevant information. Participants improved on the inference task after instruction, indicating that they could apply newly acquired declarative knowledge to make inferences from graphics. In Experiment 1, participants spent more time viewing task-relevant information and less time viewing task-irrelevant information after instruction, and in Experiment 2, the presence of task-irrelevant information impaired performance. These results show that domain knowledge can affect information selection and encoding from complex graphics as well as processes of interpreting and making inferences from the encoded information. They also provide validation of one principle for the design of effective graphical displays, namely that graphics should not display more information than is required for the task at hand. 相似文献
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《Learning and Instruction》2003,13(2):157-176
Animation can provide learners with explicit dynamic information that is either implicit or unavailable in static graphics. However, the inclusion of temporal change in a visual display introduces additional and qualitatively different information processing demands. For learners to be successful in building high-quality mental models from animated instruction, they must extract thematically relevant information from the animation and incorporate it into their knowledge structures. Animation group subjects used a dynamic depiction of weather map changes to help them predict the future pattern of meteorological markings on a given map and then made a further prediction for a different map without the aid of the animation. Predictions from these subjects were superior in some respects to those produced by control subjects but this superiority tended to be limited to aspects that had high perceptual salience in the animation. The findings indicate selective processing of the animation that involved perceptually driven dynamic effects analogous to the field–ground effects associated with the visuospatial characteristics of static graphics, and raise questions about the widely assumed intrinsic superiority of animations over static graphics as resources for learning. 相似文献
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王小玉 《西安文理学院学报》2006,9(1):44-47
为实施管道安全风险评估,需要收集、存储和处理大量的管道信息,为此开发一套全国石油天然气管道安全管理信息系统.该系统在Microsoft Visual Basic 6.0环境下设计了一系列可视化界面并通过Access数据库解决了管道地理信息和属性信息的动态管理,在电子地图上利用MapInfo MapX 5.0控件实现了管线图形的动态管理,并通过管线内插节点解决了大跨度管线图形的正常显示及MapX节点编辑模式下系统异常的问题.该系统已被用户用于石油天然气管道信息管理,效果良好. 相似文献
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Ioanna Vekiri 《Educational Psychology Review》2002,14(3):261-312
The article reviews studies that explain the role of graphical displays in learning and synthesizes relevant findings into principles for effective graphical design. Three theoretical perspectives provide the framework that organizes the review: dual coding theory, visual argument, and conjoint retention. The three theories are compatible although they are based on different assumptions. Research suggests that graphics are effective learning tools only when they allow readers to interpret and integrate information with minimum cognitive processing. Learners' characteristics, such as prior subject-matter knowledge, visuospatial ability, and strategies, influence graphic processing and interact with graphical design to mediate its effects. Future research should investigate the interplay between display and learner characteristics and how graphical design can address individual differences in learning from graphics. 相似文献