The document outlines three types of coordinate systems: modal, working, and screen coordinate systems. The modal coordinate system is a Cartesian system used by software for modal geometrical data, while the screen coordinate system is a 2D, device-dependent system with its origin at the lower left corner of the display. Each system has specific applications and orientations in their respective contexts.

2. There are
three types
of Co-
ordinate
system:
Modal Co-
ordinate System
Working Co-
ordinate system
Screen Co-
ordinate
system

3. Modal Co-ordinate system:
1. It is defined as the reference space of modal with respect to all the
modal geometrical data is stored.
2. It is a cartesian system which forms the default co-ordinate system used
by a particular software program.
3. The X, Y and Z-axis of the MCS can be diplayed on the computer screen.

4. Possible
orientations of
MCS in 3D
space

6. Screen Co-ordinate System:
1. Screen Co-ordinate System (SCS)is defined as a 2D device-dependent co-
ordinate system.
2. SCS origin is located at the lower left corner of the graphics display.
3. The physical dimension of a device screen (aspect ratio) and the type of
device (raster) determining the range of the SCS.
4. SCS is mostly used in view-related clicks.

7. Thank you