AUTO CAD 2005 basic level course chapter 3

III.1 Solid
Creates solid-filled triangles and quadrilaterals

Command linesolid

To create a 2D solid object
  1. At the Command prompt, enter solid.
  2. Specify the first point.
  3. Specify the second point, moving left to right.
  4. Continue to specify points. Press ENTER when the object is complete.
When you create a quadrilateral solid-filled area, the sequence of the third and fourth points determines its shape. Compare the following illustrations:
Notice that to create the quadrilateral area, both the top and bottom edges are specified from left to right. If you specify the first point on the right and the second point on the left, then the third and fourth points should also be in a right-to-left direction. As you continue to specify pairs of points, be sure to continue this zigzag sequence to ensure the results you expect.

Controls the filling of objects such as hatches, two-dimensional solids, and wide   polylines

Command line:  fill (or 'fill for transparent use)
Enter mode [ON/OFF] <current>:  Enter on or off, or press ENTER

Turns on Fill mode. For the filling of a 3D object to be visible, its extrusion direction must be parallel to the current viewing direction, and hidden lines must not be suppressed.
Turns off Fill mode. Only the outlines of objects are displayed and plotted. Changing Fill mode affects existing objects after the drawing is regenerated. The display of lineweights is not affected by the Fill mode setting.

Creat a line object with particular width.

Command line: trace
Specify trace width <current>:  Specify a distance or press ENTER
Specify start point:  Specify a point (1)
Specify next point:  Specify a point (2)
Specify next point:  Specify a point (3) or press ENTER to end the command

The endpoints of a trace are on the center line and are always cut square. Trace automatically calculates the correct bevels for connection to adjacent segments. AutoCAD delays drawing each segment until you either specify the next segment or press ENTER. Because of the way bevels are handled, Trace has no undo option.
Traces are solid filled when Fill mode is on. When Fill mode is off, only the outline of a trace is displayed.

Regions are two-dimensional areas you create from closed shapes or loops. Closed polylines, lines, and curves are valid selections. Curves include circular arcs, circles, elliptical arcs, ellipses, and splines. AutoCAD converts closed 2D and exploded planar 3D polylines in the selection set to separate regions and then converts polylines, lines, and curves to form closed planar loops (outer boundaries and holes of a region). If more than two curves share an endpoint, the resulting region might be arbitrary.

Command line:  region
Select objects:  Use an object selection method and press ENTER when you finish

Edits polylines and three-dimensional polygon meshes.

Command line:  pedit
Select polyline or[Multiple]:Use an object selection method or enter m

By using pedit, the object is converted into a single-segment 2D polyline that you can edit. You can use this operation to join lines and arcs into a polyline
Close : Creates the closing segment of the polyline, connecting the last segment with the first. AutoCAD considers the polyline open unless you close it using the Close option.

The remaining prompts depend on whether you have selected a 2D polyline, a 3D polyline, or 3D polygon mesh.
If the selected object is a line or an arc, AutoCAD prompts:
Object selected is not a polyline.
Do you want it to turn into one? :  Enter y or n, or press ENTER

Adds lines, arcs, or polylines to the end of an open polyline and removes the curve fitting from a curve-fit polyline. For objects to join the polyline, their endpoints must touch unless you use the Multiple option at the first PEDIT prompt. In this case, you can join polylines that do not touch if the fuzz distance is set to a value large enough to include the endpoints.

Select objects:  Use an object selection method

If you previously selected multiple objects using the Multiple option, AutoCAD displays the following prompt:

Enter fuzz distance or [Jointype]<0 .0000="">:  Enter a distance or j

Sets the method of joining selected polylines.

Enter a vertex editing option
Enter join type [Extend/Add/Both}:  Enter e, a, or b

Joins the selected polylines by extending or trimming the segments to the nearest endpoints.
Joins the selected polylines by adding a straight segment between the nearest endpoints.
Joins the selected polylines by extending or trimming if possible. Otherwise joins the selected polylines by adding a straight segment between the nearest endpoints.

Creates a rectangle using the specified points as diagonally opposite corners. The sides of the rectangle are parallel to the X and Y axis of the current UCS.

Command line:  rectang or rectangle
Specify first corner point or [Chamfer/Elevation/Fillet/Thickness/Width]:  Enter an option or specify a point (1)
Specify other corner point or [Dimensions]:  Specify a point (2)

Chamfer       : Sets the chamfer distances for the rectangle.
Elevation      : Specifies the elevation of the rectangle.
Fillet             : Specifies the fillet radius of the rectangle.
Thickness     : Specifies the thickness of the rectangle.
Width           : Specifies the polyline width of the rectangle to be drawn. 

Creates an equilateral closed polyline

Command line:  polygon
Enter number of sides <current>:  Enter a value between 3 and 1024 or press ENTER
Specify center of polygon or [Edge]:  Specify a point (1) or enter e

Center of polygon
Defines the center of the polygon.

Enter an option [Inscribed in circle/Circumscribed about circle] :  Enter i or c or press ENTER
Inscribed in Circle
Specifies the radius of a circle on which all vertices of the polygon lie.

Specify radius of circle:  Specify a point (2) or enter a value

Specifying the radius with your pointing device determines the rotation and size of the polygon. Specifying the radius with a value draws the bottom edge of the polygon at the current snap rotation angle.

Circumscribed about Circle
Specifies the distance from the center of the polygon to the midpoints of the edges of the polygon.

Specify radius of circle:  Specify a distance

Specifying the radius with your pointing device determines the rotation and size of the polygon. Specifying the radius with a value draws the bottom edge of the polygon at the current snap rotation angle.

Defines a polygon by specifying the endpoints of the first edge.
Specify first endpoint of edge:  Specify a point (1)
Specify second endpoint of edge:  Specify a point (2)

A polyline is a connected sequence of line segments created as a single object. You can create straight line segments, arc segments, or a combination of the two.
Command line:  pline
Specify start point:  Specify a point (1)
Current line-width is
Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]:   Specify a point (2) or enter an option

Create Arc Polylines
When you draw arc segments in a polyline, the first point of the arc is the endpoint of the previous segment. You can specify the angle, center point, direction, or radius of the arc. You can also complete the arc by specifying a second point and an endpoint.

Create Closed Polylines
You can draw a closed polyline to create a polygon. To close a polyline, specify the starting point of the last side of the object, enter c (Close), and press ENTER.

Create Wide Polylines
You can draw polylines of various widths by using the Width and Halfwidth options. You can set the width of individual segments and make them taper gradually from one width to another. These options become available after you specify a starting point for the polyline.

The Width and Halfwidth options set the width of the next polyline segments you draw. Zero (0) width produces a thin line. Widths greater than zero produce wide lines, which are filled if Fill mode is on and outlined if Fill mode is off. The Halfwidth option sets width by specifying the distance from the center of the wide polyline to an outside edge.

When you use the Width option, you are prompted for both a starting and an ending width. By entering different values, you can taper the polyline. The starting and ending points of wide polyline segments are in the center of the line. Intersections of adjacent wide segments are usually beveled. However, nontangent arc segments, acute angles, or segments that use a dash-dot linetype are not beveled.

Create Polylines from the Boundaries of Objects
You can create a polyline from the boundaries of overlapping objects that form a closed area. A polyline created using the boundary method is a separate object, distinct from the objects used to create it. You can edit it using the same methods used to edit other polylines.
To expedite the boundary selection process in large or complex drawings, you can specify a group of boundary candidates, called a boundary set. You create this set by selecting the objects you want to use define the boundary.

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