浙大计算机辅助设计与制造复习题及答案

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1、一、名词解释1.CAD、CAM、CAEcomputeraideddesignisthetechnologyconcernedwiththeuseofcomputersystemtoassistinthecreation,modification,analysis,andoptimizationofadesign.computeraidedengineeringisatechnologyconcernedwiththeuseofcomputersystemtoanalyzeCADgeometry,allowingthedesignertosimulateandstudyhowt

2、heproductwillbehavesothatthedesigncanberefinedandoptimized.computeraidedmanufacturingisthetechnologyconcernedwiththeuseofcomputersystemstoplan,manage,andcontrolmanufacturingoperationsthrougheitherdirectorindirectcomputerinterfacewiththeplant’sproductionresources.2.Graphicslibraryitisalibrar

3、yconcludingasetofsubroutines,eachofwhichhasaspecificpurpose.agraphicsdeviceisusuallyequippedwithagraphicslibrary.3.Viewport/windowsViewport:：theviewportisthearea(orareas)onthedisplaymonitorwherewewanttheprojectedimagetoappear.Itisanareatowhichtheviewingvolumedefinedbythewindowismapped.windo

4、ws：Itdefinestheregioninspacethatwillbeprojectedontothedisplaymonitorsothatanyobjectoutsidethewindowwillnotappearonthemonitor4.DisplaylistAdisplaylistisagroupofgraphicslibrarycommandsthathavebeenstoredforlaterexecutionandisforthebenefitofconvenienceandefficiency5.ParametricprogramInmacroprog

5、ramming,graphiccommandsaredefinedasvariables.Whenwechangethevalueofthevariables,wecangetvariousoutputs.Inthiscasethemacroprogramiscalledparametricprogram.6.Parametricmodelingmodelingashapebyusinggeometricconstrainsanddimensiondataonitselements.7.Constructivesolidgeometrystructurestoresinatr

6、eethehistoryofapplyingBooleanoperationsontheprimitivesinatree8.MacroprogramWhenasequenceofgraphicscommandsiscomposedintoaprogram,itiscalledamacroprogram9.Rapidprototypeitusesthegeometricmodelofaparttomanufacture.Bylayingcompositemateriallayerbylayer,itgeneratesaprototype二、简述题1.简述devicecoord

7、inatesystem的定义、特点及缺点设备坐标系是在显示器上定义的二维坐标系统，用于定义显示器上点的参考位置特点1．原点可以任意定义。2．原点的位置不同，u轴、v轴的方向不同，u、v值的取值范围不同，同一位置可以转化为不同的u、v坐标值3．如果同一图形在不同图形设备上显示，其设备坐标可能会改变2.举例说明图形输入设备常用的三种输入方式1.Sampling（采样）drawtext时，鼠标移动，标尺栏中显示连续变化的坐标值.2.Requesting（请求）绘制一个顶点时显示的坐标值3.picking（点取