6. What is an XRECORD? XRECORD are objects that are used to store and manage arbitrary data. They are similar in concept to XData but is not limited by size or order. I found this on help section of AUTOLISP which gets bundled along with AUTOCAD. There is lot more information about it....
4. What is an APPID? APPID is some kind of table where application names are saved with the extended data of each entry that uses them. This is done so that autocad recongnises them. Again I found this on help section of AUTOLISP which gets bundled along with AUTOCAD. 2010/1/20 Rodrigo Rodrigues da Silva <[email protected]> > Thanks! > > > -------- Original Message -------- > Subject: Re: [libredwg] AUTOCAD Info > Date: Wed, 20 Jan 2010 11:42:35 +0530 > From: guruprasad rane <[email protected]> > To: Rodrigo Rodrigues da Silva <[email protected]> > References: <1263919888.4144.26.ca...@k78> < > [email protected]> > > > > 1. What is a MTEXT? Is it different from a TEXT? > MTEXT is mutliline text. It support formatting features like bold, italics, > underline, left-center-right align, top-middle-bottom align, tabs, > numbering, letter-spacing, font-angle(obliquing), font-stretching (width > factor),etc. Different formating features can be applied to different part > of MTEXT (ie. first few words in bold, next few in italics) Above this we > can format test using text styles. > > TEXT is single line text. If you need text with two line we need to create > two seperate TEXT. It supports left-center-right, width factor and > obliquing. But these features need to be applied to the whole text. We can > not have different formatting to different parts of TEXT. > > 2. What is a viewport? > Viewport is the rectangle window through which we see the graphics. Say the > black screen on which we can see a circle or click on the viewport to start > drawing a line. We can create multiple viewports at a time. Each viewport > can be assigned a direction like top, bottom, left, right, front, back, > isometeric, perspective etc. So we can see a cube from top in top view port, > from left fem left viewport etc. > > > Remaining questions I will answer later. If needed I can send snapshots of > these items.. > > Regards > Guruprasad > > > 2010/1/20 Rodrigo Rodrigues da Silva <[email protected] <mailto: > [email protected]>> > > > > I can program somewhat but i have very good understanding about > AUTOCAD, > I have used AUTOCAD for around 12years. I know the software in > and out. > So feel free to ask me questions about it. > > > Do you have any understanding on the internals? > > Can you answer any of these questions: > > 1. What is a MTEXT? Is it different from a TEXT? > 2. What is a viewport? > 3. What is a VP_HDR_CTRL_OBJ? > 4. What is an APPID? > 5. How many LAYER_CONTROL objects can we find within a file? > 6. What is an XRECORD? > > > > > >
