Thiết kế flash - Cad viewing and coordinate system commands

CAD Viewing and Coordinate System CommandsCAD Command CategoriesObject (draw, modify)ViewCoordinate SystemCAD Viewing CommandsControl position from which an object is viewedViewer moves, not the object2D viewing controlsPanZoom3D viewing controlsCompose pictorial and orthographic viewsViewing in AutoCADPANZoom3DOrbitView ToolbarVPointVIEWPLANDViewVPORTSCAD Coordinate SystemsGoverned by the Right Hand RuleDefines a workplaneUnique, default global coordinate systemMany user-defined, local coordinate systemsRight Hand Rule - 1Thumb indicates the positive x direction Index finger indicates the positive y direction Middle finger indicates the positive z direction Palm of the right hand represents the xy plane Used to define the positive direction of the axes of a three dimensional coordinate system Right Hand Rule - 2Right thumb aligned with positive axis directionPositive rotation indicated by direction of four fingers curling about axisVariation used to determine direction of positive rotation about an axisWorkPlanesCAD Coordinate System CommandsCreates a new, user-defined workplane Used to translate and/or rotate a coordinate systemUser-defined coordinate system assists in object/feature definitionCoordinate Systems in AutoCADGlobal coordinate system is called World Coordinate System (WCS)Defines a horizontal xy workplaneTop (plan) view is defaultLocal coordinate system is called User Coordinate System (UCS)User definedCoordinate System Control in AutoCADUCS ToolbarUCS commandUCSICON commandddUCsCAD Viewing and Coordinate System CommandsNon c’e piu!