1. Coordinate Systems
John Kirby

2. Coordinate Systems in AutoCAD
WCS or World Coordinate System
Referred to as the top right quadrant (quadrant 1) of the Cartesian Coordinates System
Used when inputting lines with mouse
Default system for inputting lines
UCS or User Coordinate System
User defined
Points are typed to locate position by Absolute, Relative, or Polar input points

3. 2D Cartesian Coordinate System4 6 8 -2 -4 -6 -8
Y Axis
X Axis
-X Axis
-Y Axis
Quadrant 2
Quadrant 1
Quadrant 3
Quadrant 4

4. Define Absolute Position
Based on X & Y axes intersection
0 for X
0 for Y 2 4 6 8 -2 -4 -6 -8
Y Axis
X Axis
-X Axis
-Y Axis

5. What is the absolute position?2 4 6 8 -2 -4 -6 -8
Y Axis
X Axis
-X Axis
-Y Axis
5,5

6. What is the second absolute position?2 4 6 8 -2 -4 -6 -8
Y Axis
X Axis
-X Axis
-Y Axis
-5,-5
5,5

7. What is the third absolute position?2 4 6 8 -2 -4 -6 -8
Y Axis
X Axis
-X Axis
-Y Axis
-5,5
5,5
-5,-5

8. What is the fourth absolute position?2 4 6 8 -2 -4 -6 -8
Y Axis
X Axis
-X Axis
-Y Axis
-5,5
5,5
-5,-5
5,-5

9. What size is the object if you connect the four points?
10 units by 10 units 2 4 6 8 -2 -4 -6 -8
Y Axis
X Axis
-X Axis
-Y Axis
-5,5
5,5
-5,-5
5,-5

10. Draw the same 10 X 10 box using AutoCad
Type line at the command prompt in AutoCAD and press enter

11. Input the First Absolute Point
Type 5,5 to specify the first point and press enter.
You have now input the first point in Quadrant 1 to the absolute position of 5 in the X and 5 in the Y position.

12. Input the Second Absolute Point
Type -5,5 to specify the next point and press enter.
You have now input the second point in Quadrant 2 to the absolute position of -5 in the -X and 5 in the Y position.

13. Input the Third Absolute Point
Type -5,-5 to specify the next point and press enter.
You have now input the third point in Quadrant 3 to the absolute position of -5 in the -X and -5 in the
-Y position.

14. Input the Fourth Absolute Point
Type 5,-5 to specify the next point and press enter.
You have now input the fourth point in Quadrant 4 to the absolute position of 5 in the X and -5 in the
-Y position.

15. Completing the 10 x 10 Square
Type c and press enter. This will close the square.
This will close the square to 10 x 10 units when you press the enter key.

16. The Completed 10 x 10 Square This will closed 10 x 10 square.
Press the f2 key and the text window will open that displays all of the absolute points and commands used in this activity.
AutoCAD text window will open.

17. Thinking for Yourself Using only Quadrant 1
Draw the initials for your first and last name
Plot the initials using graph paper to layout
Complete the assignment using a CAD program to draw the absolute points for your initials

18. Plot all Points in Quadrant 12 4 6 8
Y Axis
X Axis 10 12 14 16

19. Plot all Points in Quadrant 12 4 6 8
Y Axis
X Axis 10 12 14 16