18-2. 2D Coordinates ABSOLUTE rectangular coordinates

AutoCAD 2D Absolute rectangular coordinate system


 AutoCAD Coordinate


Quadrants in Absolute Coordinate System in AutoCAD


In the picture above you see what it looks like the drawing coordinate system with absolute coordinates.

Absolute rectangular coordinates are points which are located at some distance from the origin (UCS's) and make the intersection of axes X and Y.

Our visual desktop when you start AutoCAD is located in quadrant I, because we UCS is located in the lower left corner. Given that absolutely coordinate system based on the X, Y coordinates from the starting point at the origin (UCS's) way, we will also work when used in this system, X and Y coordinates for a set of points on the desktop.

IMPORTANT! Remember to work with ABSOLUTE COORDINATES always start from the origin UCS , wherever UCS was placed in the drawing. So we always X = 0 and y = 0 as a starting point (origin)

While entering the coordinates of the first to enter the coordinates X and Y coordinates and then, they are separated by a comma.



Before drawing you must run the command that we want to draw a Line or Polyline and then determine the coordinates of which are the intersection of X and Y axes.

Take for example the image below the yellow line (that line is the line with absolute coordinates)

Command: LINE [start order]
Specify first point: 3,4 [Input X and Y coordinates separated by a comma, the first point of the line - starting]
Specify next point or [Undo]: 8,10 [enter X and Y coordinates separated by a comma, the second point of the line - final]

Example picture below the Red line (that line is the line with absolute coordinates in quadrant II (-X +Y)

Command: _line
Specify first point: -5,7 [enter X and Y coordinates separated by a comma, the first point of the line]
Specify next point or [Undo]: -12,15 [enter X and Y coordinates separated by a comma, the second line item]
(Image below shown ) How to Draw a Lines using Absolute Rectangle Coordinates in AutoCAD using Command Line
Draw Line via Command Line prompt


If we had any chance, entered the coordinates of both negative (-X and -Y), then we would be concerned point in quadrant III, and in case (X and -Y) in quadrant IV.

IMPORTANT! Note that when you draw with Absolute COORDINATES always start from the Origin and UCS.

EXAMPLE 2

Sketch drawn Absolute Rectangular Coordinates.

Command: LINE [start order]
Specify first point: 10.10 [Item 1, we have determined by X 10 and Y are set to 10 units]
Specify next point or [Undo]: 20.10 [point 2, we have determined by X 20 and Y are set to 10 units]
Specify next point or [Undo]: 20.20 [point 3, we have determined by X 20 and Y are determined by 20 units]
Specify next point or [Close/Undo]: 18,20 [item 4, we have determined the X 18 and Y are determined by 20 units]
Specify next point or [Close/Undo]: 18,12 [Item 5, were determined by X 18 and Y are determined by 12 units]
Specify next point or [Close/Undo]: 12,12 [point 6, we have determined by X 12 and Y are determined by 12 units]
Specify next point or [Close/Undo]: 10,10 [point 7, we have determined by X 10 and Y are set to 10 units]
Specify next point or [Close/Undo]: ESCAPE (ESC) (end of drawing)

 AutoCAD Example 2D Draw by Absolute Rectangular Coordinates

EXAMPLE 3

Command: LINE
Specify first point: 10,10 [Item 1, the distance 10 from the UCS and the X and Y]
Specify next point or [Undo]: 20,10 [point 2, the distance 20 from the UCS and the X and Y by 10]
Specify next point or [Undo]: 20,15 [Clause 3, the distance 20 from the UCS and the X and Y by 15]]
Specify next point or [Close/Undo]: 15,20 [Clause 4, the distance of 15 from the UCS and the X and Y by 20]]
Specify next point or [Close/Undo]: 10,20 [Item 5, distance 10 from the UCS and the X and Y by 20]]
Specify next point or [Close/Undo]: 10,10 [point 6, the distance 10 from the UCS and the X and Y by 10]]
Specify next point or [Close/Undo]: ESCAPE

 Drawing via Command Line Prompt in AutoCAD


Use Absolute COORDINATES in AutoCAD


This Example above, We can draw with the Mouse using the ORTHO mode but with the additional entry of line length.

Drawing With Mouse:

  1. - switched function button ON for ORTHO mode
  2. - Running the Line
  3. - determining the starting point of 10.10 [Item 1]
  4. - is at point 1, the mouse EAST determine the direction and then in the command line prompt by entering 10 [item 2]
  5. - Located in section 2, determine the direction of the mouse and then NORTH command line prompt by entering 5 [item 3]
  6. - is at point 3 (a starting point we are now at point 3, as we enter relative coordinates), type the command line prompt relative coordinate @ -5,5
  7. - is at point 4, the mouse determine the direction of WEST and then type 5 [item 5]
  8. - is at point 5, the mouse determine the direction of South and then type 10 [item 6]

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