Monday, May 2, 2011

Auto CAD - Draw Command - Drawing Line

DRAW COMMAND

Draw commands create objects. An object is the smallest component of a drawing. The draw commands listed immediately below create simple objects and are discussed in this unit. Simple objects appear as one entity.

Line, Circle, Arc, Ellipse, Pline, Polygon, Donut

Normally, there are three methods that can be used to access draw commands. We can use either the draw toolbar, command window or pull-down menu (Picture below).



DRAWING LINE
This is the fundamental drawing command. Use the line command to construct a line from one endpoint to the other. One or several line segments can be drawn with the line command. You can specify the endpoints of lines using two-dimensional or three-dimensional coordinates.

The LINE command can be initiated using any of the following methods (Picture below) :


When you initiate the Line command, AutoCAD requests you to specify a From point (starting point) and To Point (ending point). These requests are displayed in the Command Window. Most Command requires a few steps to complete. The Command Window tells you which step you are currently at. The Command Window also displays the option available to you for each of the command that you initiate. 

There are 2 ways of specifying the From Point :

1.    By using the mouse to point to the location and clicking the left mouse button.
2.    By using the Command Line and entering the coordinates of the point  (coordinates x, coordinates y).

There are 3 ways of specifying a To Point :

1.    By using the mouse to point to the location and clicking the left mouse button.
2.    By using the Command Line and entering the coordinates of the point (coordinates x,  coordinates y).
3.    By using the Command Line and entering the length of the line, and the angle of the  line in relation to the From Point ( @ length < angle ).

There are several methods to draw lines. They are :

1)     Absolute coordinates









2)     Relative coordinates











3)     Relative polar coordinates





















Option of the LINE command

1.     CLOSE

The  CLOSE   option  ( key-board  :   c )   closes   a  polygon  ( minimum of three sides ) when all segments are drawn in the same command sequence. Picture below.


2.    UNDO

The UNDO option ( key-board  :  u  ) allows the user to undo the last segment drawn without ending the command procedure. Refer picture below.

Example ;

    Command  :     LINE From point : 50,50          P1
    To point     :     @50<0                                     P2
    To point     :     @50<0                                     P3’
    To point     :     u  ( key-board = u )              back to P2
    To point     :     @50<90                                   P3
    To point     :     @50 <180                                P4
    To point     :     @50<270  ( or   close )         P1 = P5





To Be Continue.. Next > Drawing Circle.

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