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Autocad for dummies - Byrnes D.

Byrnes D. Autocad for dummies - Wiley publishing, 2007. - 435 p.
Download (direct link): autocad2006.pdf
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Table 6-1 AutoCAD Drawing Commands
Button Command Major Options Toolbar Button Draw Menu
/* LINE Start, end points Line Line
RAY Start point, point through which ray passes None Ray
/ XLINE Two points on line Construction line Construction line
PLINE Vertices Polyline Polyline
o POLYGON Number of sides, inscribed/ circumscribed Polygon Polygon
о RECTANG Two corners, dimensions, area, rotation Rectangle Rectangle
Chapter 6: Where to Draw the Line 135
Button Command Major Options Toolbar Button Draw Menu
ARC Various methods of definition Arc Arc; submenu for definition methods
© CIRCLE Three points, two points, tangent Circle Circle; submenu for definition methods
О REVCLOUD Arc length Revision Cloud Revision Cloud
DONUT Inside, outside diameters None Donut
r1 SPLINE Convert polyline or create new Spline Spline
О ELLIPSE Arc, center, axis Ellipse Ellipse; submenu for definition methods
POINT Point style Point Point; submenu for definition methods
Many of the choices on the AutoCAD Draw menu open submenus containing several variations on each drawing command.
AutoCAD’s drawing commands are highly interactive. You need to read and respond to the prompts at the dynamic tooltip next to the crosshairs or the command line. (If command line sounds to you like a military operation, not an AutoCAD essential concept, see Chapter 2.) Many of the command options that you see in command line prompts are available as well by pressing the up- and down-arrow keys to display the options at the dynamic tooltip. You can also right-click and select command options from the context-specific shortcut menu.
AutoCAD’s Dynamic Input system displays a lot of the information that you used to have to look down to the command window to see. To use Dynamic Input, make sure the DYN button on the status bar is pressed in. Don’t turn the command window off just yet though, especially if you’re new to AutoCAD. We recommend that you keep the command window open and docked at all times.
136 Part II: Let There Be Lines
So what’s the best course: to enter drawing commands from the command line or to choose them from the menus or toolbars? We suggest that you start a drawing command the first few times by clicking its button on the Draw toolbar — until you remember its command name. After you click the button, fasten your eyes on the command window so that you see the name of the command and its command line options. Use the keyboard or the right-click menus to select options. After you’re acquainted with a drawing command and decide that you like it enough to use it often, find out how to type its keyboard shortcut.
A few drawing commands, such as DONUT (DO), aren’t on the Draw toolbar; you have to type those or choose them from the Draw menu.
The Straight and Narrow: Lines, Polylines, and Polygons
As we harp on a bunch of times elsewhere in this book, CAD programs are for precision drawing, so you’ll spend a lot of your AutoCAD time drawing objects composed of straight-line segments. This section covers these commands:
* LINE (L): Draws a series of straight line segments; each segment is a separate object.
^ PLINE (PL): Draws a polyline — a series of straight and/or curved line segments; all the segments remain connected to each other as a single object.
^ RECTANG (REC): Draws a polyline in the shape of a rectangle.
^ POLYGON (POL): Draws a polyline in the shape of a regular polygon (that is, a closed shape with all sides equal and all angles equal).
The following additional straight-line drawing commands also are available in AutoCAD:
^ RAY: Draws a semi-infinite line (a line that extends infinitely in one direction).
^ XLINE (XL): Draws an infinite line (a line that extends infinitely in both directions).
The RAY and XLINE commands are used to draw construction lines that guide the construction of additional geometry. Drawing construction lines is less common in AutoCAD than in some other CAD programs. AutoCAD’s many precision techniques often provide more efficient methods than construction lines of creating new geometry.
Chapter 6: Where to Draw the Line 137
Toe the line
The LINE command in AutoCAD draws a series of one or more connected line segments. Well, it appears to draw a series of connected segments. In fact, each segment, or piece of a line with endpoints, is a separate object. This construction doesn’t seem like a big deal until you try to move or otherwise edit a series of segments that you drew with the LINE command; you must select every piece separately. To avoid such a hassle, use polylines (described later in this chapter), not lines and arcs, when you want the connected segments to be a single object.
If you’re used to drawing lines in other programs, you may find it confusing at first that AutoCAD’s LINE command doesn’t stop after you draw a single segment. AutoCAD keeps prompting you to specify additional points so that you can draw a series of (apparently) connected segments. When you’re finished drawing segments, just press the Enter key to finish the LINE command.
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