Overview of Computer Aided Design (CAD) | Advantages | Co‐ordinate systems | drawing commands

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Co‐ordinate systems used in CAD 

1. Using Absolute Coordinate System :

Draw a line from point (5,5) to Point (10,10)

Command: LINE

From a point: 5,5 (Select the point by mouse or enter the coordinates by keyboard).

To point : 10,10

To point : (Press Enter).

Fig.: To draw a line using an Absolute Coordinate System

2. Using Relative Coordinate System :

 Draw a line from point (2,2) to point 5 units on the x‐axis and 8 units on the y‐axis relative to first

 coordinate Command : LINE From point : 2, 2 To point : @ 5,8

 To point : (Press Enter)

Fig.: To draw a line using the Relative Coordinate System

3. Using Polar Coordinates :

 Draw a line from point (1, 2)  to a length of 6 units of 90 degree

 Command : LINE From point : 1,2 To point : @6 90

 To point : (Press Enter)

Fig.: To draw a line using the Polar Coordinate System