Computer Graphics Lecture 5

Graphics Library Graphics Library : There are many graphics library use with program language to draw shape. Example : Graphics.h with Borland C++ The most common libraries use today is open Graphical Libraries called Open GL

Open GL Basic library of functions is provided in Open GL for specifying graphics Open GL use with all operating system with program language.

Header files:- In all our graphics program, we need to include the header file for Open GL library. For most application we will need also GLU, and we need to include header file for windows system, for instance, with Microsoft windows, the header file, must be list before GL,GLU. Because it contains macros needed by Microsoft windows version to Open GL library.

Header files:- Example :- #include

Open GL role or characteristics 1)all Open GL instruction start with gl 2)all Open GL start with capital letter 3) Open GL code is sensitive case 4)if we define const start with GL and (-)all prefix start by capital letter (GL- COLOR- BUFFER-BIT)

Open GL libraries GLU:- Open GL utility, provided routines for setting up viewing,and describing complex objects with line and polygons. Every Open GL implementation includes GLU library, and all GLU function name start with prefix glu. Open inventor :- provides routines and predefined object shapes for interactive three dimensional application.

Open GL libraries PGL:- presentation to Open GL AGL:-apple GL, use as interface for window management