USER INTERFACE & COORDINATE SYSTEM & IMPORTANT COMMAND

AUTOCAD USER INTERFACE:-

AUTOCAD USER INTERFACE DETAILS

COORDINATE SYSTEM:-   THERE ARE FOUR(4) TYPES OF

 COORDINATE-SYSTEM- 

                    1. ABSOLUTE COORDINATE SYSTEM,
                   
                    2. RELATIVE RECTANGULAR COORDINATE SYSTEM,

                    3. RELATIVE POLAR COORDINATE SYSTEM,

                    4. DIRECT DISTANCE ENTRY    


1. ABSOLUTE COORDINATE SYSTEM:-

IN THE ABSOLUTE COORDINATE SYSTEM ALL POINTS

ARE MEASURED FROM THE ORIGIN (0,0). THEY ARE 

SUITED TO SITUATIONS WHERE YOU KNOW THE EXACT

X AND Y LOCATION OF THE POINT YOU WANT TO 

PLACE.

TO ENTER AN ABSOLUTE COORDINATE USE THE FORMAT

X,Y WHERE X IS THE DISTANCE AND DIRECTION ALONG THE HORIZONTAL AXIS FROM THE ORIGN (0,0). Y IS THE DISTANCE AND DIRECTION ALONG THE VERTICAL AXIS FROM THE ORIGN (0,0).

2. RELATIVE RECTANGULAR COORDINATE SYSTEM:-

 RELATIVE COORDINATE ENTTRIES ARE

BASED ON THE LAST POINT ENTERED. USE A RELATIVE COORDINATE WHEN
YOU KNOW THE LOCATION OF A POINT
IN RELATION TO THE PREVIOUS POINT.

TO SPECIFY A RELATIVE COORDINATE,
PRECEDE THE COORDINATE WITH THE
'@' SIGN USING THE FORMAT @ X,Y
WHERE @ INDICATES A RELATIVE DIS-
TANCE.

X IS THE POSITIVE OR NEGATIVE
DISTANCE ALONG THE X AXIS FROM THE PREVIOUS POSITION . Y IS THE POSITIVE OR NEGATIVE DISTANCE ALONG THE Y AXIS FROM THE PREVIOUS POINT.


3. RELATIVE POLAR COORDINATE SYSTEM:-

A COMBINATION OF ANGLE AND DISTANCE
INPUT IS CALLED POLAR COORDINATE. YOU
USE POLAR COORDINATE WHEN YOU KNOW
THE ANGLE AND THE DISTANCE FROM ONE POINT TO ANOTHER. IN AUTOCAD ANGLES
ARE POSITIVE (+) WHEN MEASURED
COUNTER-CLOCKWISE AND NEGATIVE (-)
WHEN MEASURED CLOCKWISE.

TO SPECIFY A RELATIVE POLAR COORDINATE,
PRECEDE THE COORDINATE WITH THE '@' SIGN
USING THE FORMAT @L<A. HERE L MEANS LENGTH AND A MEANS ANGLE.

4. DIRECT DISTANCE ENTRY:-

A SIMPLIFIED METHOD OF ENTERING COORDINATES WHEN THE DISTANCE AND DIRECTION FROM THE LAST POINT ARE KNOWN IS CALLED DIRECT DISTANCE ENTRY. IN A NUTSHELL, DIRECT DISTANCE ENTRY ELIMINATES THE NEED FOR MOST KEYBOARD ENTRY OF COORDINATES. DIRECT DISTANCE ENTRY CAN BE USED ANYTIME A COMMAND PROMPTS FOR A POINT

LOCATES THE NEXT POINT AT A SPECIFIED DISTANCE IN THE DIRECTION OF YOUR CURSOR

AT A PROMPT TO LOCATE A POINT, ENTER A NUMERIC VALUE

WITH DIRECT DISTANCE ENTRY, YOU CAN QUICKLY SPECIFY A POINT RELATIVE TO THE LAST POINT YOU ENTERED. AT ANY PROMPT FOR A POINT LOCATION, YOU MOVE THE CURSOR FIRST TO SPECIFY THE DIRECTION, AND THEN ENTER A NUMERIC DISTANCE.

IN THE FOLLOWING EXAMPLE, THE SECOND POINT FOR THE LINE WILL BE LOCATED 5 UNITS TOWARD THE DIRECTION OF THE CURSOR. THE DIRECT DISTANCE THAT YOU ENTER IS MEASURED ALONG THE PATH FROM THE LAST POINT TO THE CURRENT LOCATION OF THE CURSOR. THIS FEATURE IS USUALLY USED WITH ORTHO OR SNAP MODE TURNED ON.

IMPORTANT COMMAND FOR AUTOCAD:-
( HERE IS A DIAGRAM OF THE “F” KEYS AND THEIR AUTOCAD FUNCTIONS)

KEY	FEATURE	DESCRIPTION
F1	HELP	DISPLAYS HELP FOR THE ACTIVE TOOLTIP, COMMAND, PALETTE OR DIALOG BOX.
F2	EXPANDED HISTORY	DISPLAYS AN EXPANDED COMMAND HISTORY IN THE COMMAND WINDOW.
F3	OBJECT SNAP	TURNS OBJECT SNAP ON AND OFF.
F4	3D OBJECT SNAP	TURNS ADDITIONAL OBJECT SNAPS FOR 3D ON AND OFF.
F5	ISOPLANE	CYCLES THROUGH 2D ISOPLANE SETTINGS.
F6	DYNAMIC UCS (AUTOCAD ONLY)	TURNS AUTOMATIC UCS ALIGNMENT WITH PLANAR SURFACES ON AND OFF.
F7	GRID DISPL AY	TURNS THE GRID DISPLAY ON AND OFF.
F8	ORTHO	LOCKS CURSOR MOVEMENT TO HORIZONTAL OR VERTICAL.
F9	GRID SNAP	RESTRICTS CURSOR MOVEMENT TO SPECIFIED GRID INTERVALS.
F10	POLAR TRACKING	GUIDES CURSOR MOVEMENT TO SPECIFIED ANGLES.
F11	OBJECT SNAP TRACKING	TRACKS THE CURSOR HORIZONTALLY AND VERTICALLY FROM OBJECT SNAP LOCATIONS.
F12	DYNAMIC INPUT	DISPLAYS DISTANCES AND ANGLES NEAR THE CURSOR AND ACCEPTS INPUT AS YOU USE TAB BETWEEN FIELDS.