Computer Graphics Software

The graphics application interface code is the frist kind of software that requried to translate the parts of an object that understood by the computer system. These application programs used the subroutline or function to traslation , rotation, projection, Clipping and other operation that perform on the image. Initial it is very typical one application program developed image display on the other hardwere and application requried some changes.

Standard Software:

The standard software requried to provide flexibility or portability of graphics system. When any package used standard . Without standard , program designed to one hardware system can not be transfered to another system without rewriting the program.

Graphics kernel system :

The frist standard graphics software that adopted was GKS, This wasdeveloped intiallay 2D graphics.Further its 3D version,Frist its provide real protability of software among different hardware system second is that no other package provied the aility to write device independed graphics program.

PHIGS (Programmer's Hierarchical Interactive Standard):

This is the second software standard that was proved by standard orgnisation which is extension of GKS.as example- POPen_phigs(), Pclose_phigs() etc.

DXF file format:

Drawings Interchange Format (DXF) is one of most important grapics data exchange format. It is widely used in AUTO CAD drawing software's.DXF file is normally an ASCLL readable text file which consist of seven major sections: header,table , block, classes, object.end of file.

IGES file format:

The initial Graphic Exchange Specification (IDES) file format also use in CAD softwere charateristics of CAD data,annotation and orgnisation of data between various vector oriented application like CAD software , Reverse Engineering .

Intrgration of Graphics Standard:

- Application interface
- Device interface
- user Interface

There are standard available for these interface and connection between these are-

1. The standard for graphics programming (GKS,gksed,phigs)
2. The interface to the device driver and to the devices level graphics commends or command library.
3. Graphics level archive and interchange (CGM, CGI,VGI)
4. The data communication interface between different system or between a system and the commercial database being used (IGES,STEP ,etc)

Input Device :

Various type of input device available in the market that used in graphics workstation .

1. Stroke : the devices that returned the coordinate position (x,y) . As like of digitizer that return the (x,y) position on the click of button. A mouse , Joystick touch pad can be programmed to send the coordinate position.

2. Locator : All the devices that return coordinate position on the graphics display continuously as they move called locator devices as mouse. Joystick,3D mouse.

3. string : The device that input text to the CPU as like keyboard.