Computer Graphics Basic

Definition and Representative Uses of Computer Graphics :

Computer graphics refer to the creation and manipulation of images, videos, and animations using a computer. It involves the use of algorithms and software to generate and display visual information on a computer screen.

Representative uses of computer graphics include:

1. Image Processing: This involves the manipulation and enhancement of digital images, such as removing noise, adjusting brightness, and changing the color balance.

2. Multimedia: Computer graphics are used to create interactive multimedia presentations, including slideshows, animations, and video games.

3. User Interfaces: Computer graphics are used to create graphical user interfaces (GUIs) for software applications, such as buttons, icons, and windows.

4. Scientific Visualization: Scientists use computer graphics to create visual representations of scientific data, such as weather patterns, medical images, and molecular structures.

5. CAD (Computer-Aided Design): Computer graphics are used in engineering, architecture, and design to create 2D and 3D models of physical objects and systems.

6. Visual Effects: Computer graphics are used in movies, television shows, and other forms of media to create special effects, such as explosions, fire, and other visual elements.

7. Virtual Reality: Computer graphics are used to create immersive virtual environments, allowing users to interact with digital objects and environments in real-time.

These are just a few examples of the many applications of computer graphics in today's digital world.

Explain Scan Coversions of Point, Line, Midpoint :-

Scan Conversion is a technique used in computer graphics to convert geometric shapes into digital form. This process involves converting mathematical representations of geometric shapes into pixels on the computer screen. The following are the scan conversions of point, line, and midpoint.

1. Point Scan Conversion: Point scan conversion involves converting a single point into pixels on the computer screen. This is done by assigning a coordinate system to the screen and mapping the point to the corresponding pixel on the screen.

2. Line Scan Conversion: Line scan conversion involves converting a line into a series of pixels on the computer screen. This is done using algorithms like DDA (Digital Differential Analyzer) or Bresenham's line algorithm. These algorithms generate a series of pixels that approximate the line, creating a smooth curve that represents the line.

3. Midpoint Scan Conversion: Midpoint scan conversion is a specific type of line scan conversion that involves converting the midpoint of a line into pixels on the computer screen. This algorithm generates a series of pixels by considering the midpoint of the line as the starting point and then moving outwards in both directions to generate the rest of the pixels that make up the line. This algorithm is more efficient than other line scan conversion algorithms as it requires fewer calculations to generate the same result.

Algorithm For Ellipse Drawing :-

There are several algorithms for drawing an ellipse, including:

1. Midpoint Algorithm: The midpoint algorithm uses the concept of midpoint of a line segment and Bresenham's line algorithm to draw an ellipse. It calculates the nearest pixels to the ellipse boundary for each quadrant and plots the points.

2. Parametric Algorithm: In this algorithm, the points on the ellipse are calculated using parametric equations. The parametric equations for an ellipse are x = a * cos(t) and y = b * sin(t), where a and b are the semi-axes of the ellipse and t is an angle that ranges from 0 to 2π.

3. Iterative Algorithm: This algorithm calculates the points on the ellipse by iteratively changing the value of x and y. It starts from a known point on the ellipse and moves along the circumference to find the next point.

4. Polynomial Algorithm: The polynomial algorithm uses the second degree polynomials to describe the ellipse. The equation for an ellipse can be written as Ax^2 + Bxy + Cy^2 + Dx + Ey + F = 0, where A, B, C, D, E, and F are constants.

All of these algorithms can be implemented in various programming languages such as C, C++, Java, etc. to draw an ellipse on a computer screen.