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Computer-Graphics-and-Visualization-10CS65-->View question

Asked On2017-06-07 06:48:22 by:Aparna-Dasgupta

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A software API consisting of around several hundred 
functions that allow you to talk to your graphics hardware. 
 It is cross-platform and the most commonly used in 
professional graphics applications
   1.Primitive functions
2.Attribute functions
3.Viewing functions
4.Transformation functions
5.Input functions
6.Control functions
7.query functions.
Primitive functions
Define the low level objects or atomic entities that our system can    
Depending on the API,the primitives can include points, line, segments, polygons, pixels, text , and various type of curves and surfaces.
Attribute functions
To perform operations ranging from choosing the color with which we display a line segment.
Eg   glColor3f(1.0,0.0,0.0);
To picking a pattern with which to fill the inside of a polygon.
To selecting a typeface(font) for the title on a graph.
Viewing functions

The viewing functions allows us to specify various views,although APIs differ in the degree of flexibility they provide in choosing a view.
glViewport (xvmin, yvmin, vpWidth, vpHeight); 
gluOrtho2D (xwmin, xwmax, ywmin, ywmax); 
Transformation functions
Transformation function that allows  to carry out transformations of objects,such as rotation, translation and scaling.
glTranslatef (tx, ty, tz); 
glRotatef (theta, vx, vy, vz);
 glScalef (sx, sy, sz);
Input function
 Allows us to deal with the diverse forms of input that characterize modern graphics systems.
void glutKeyboardFunc(void (*func) (unsigned char key, int x, int y)); 

Answerd on:2017-06-27 Answerd By:13priya

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