机械工程专业英语教程第三版lesson.doc

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1、机械五班王乘龙Lesson25ComputerGraphics(ReadingMaterial)Thetermcomputergraphicsreferstotheentirespectrumofdrawingwiththeaidofacomputer，fromstraightlinestocoloranimation．Animmenserangeofartisticcapabilitiesresidesundertheheadingofcomputergraphicsanddraftingisjustoneofthem．Computergraphicswasoriginal

2、lyassociatedwiththefieldofelectronics．Companiesdirectlyinvolvedinelectronicsdesignandmanufacturingwerethefirsttoexperimentandworkwithcomputergraphics．Astheytestedequipmentandsoftware，newdemandsarosethatrequiredchangesandadvancesinbothhardwareandsoftware．Equipmentandprogramsgotbetter，faster，

3、morepowerful，lessexpensive，colorful，andfuntooperate．Thepotentialforthisnewcomputerdevelopmentwasendless．Andasengineersanddrafterslearnedtoworkwiththenewtoolsinatechnicallydemandingatmosphere，artistswereusingthenewtoolsinanatmosphereofunlimitedstructure．Weseethestructureandfreedombroughtbyen

4、gineersandartiststocomputergraphicsaswewatchanimatedtelevisionnetwork．Complexmathematicalcalculationsarecombinedwiththecreativeeyeoftheartisttoachieveeffectsunseenjustafewyearsago．Theworldofcomputergraphicsisadynamicand，attimes，volatilefiled.Thedevelopmentsintechniqueandequipmenthaveadvance

5、drapidly，andtheareasofapplicationcontinuetospread.ThedraftingapplicationsofCADareunlimitedThespeed-of-lightcapabilitiesofthecomputerhaveshapedthegathering，processing，storage，andretrievalofinformationintoamajorindustry．Everydayourlivesaretouchedbytheeffectsofcomputers．Contrarytoscience-ficti

6、onworksofyearspast，computershavenotgrowntooccupythecoreoftheearth，buthaveshrunktomicroscopicproportions，andnowoccupytinyspacesinsideourmachinesandtools．Thetoolsofthedraftingtradehavealsofelttheelectronictouchofcomputers．Thesiliconchiphasfounditswayintodraftingtools．Theheartofmoderndraftingt

7、oolsisnowthecomputer．Thetraditionaltoolsofgraphics，suchastheT-square，compass，anddraftingmachines(Fig．25．1)arerapidlybecomingobsolete．Nowthedrafter，oroperator，useselectronichardwaretoconstructdrawings，notonpaper，butonwhatlookslikeatelevisionscreen．Thescre