COMPUTER GRAPHICS- 2 MARK QUESTIONS WITH ANSWERS

1. Define Computer graphics.

Computer graphics remains one of the most existing and rapidly growing computer fields. Computer graphics may be defined as a pictorial representation or graphical representation of objects in a computer.

2. Name any four input devices.

Four input devices are keyboard, mouse, image scanners, and trackball.

3. What is resolution?

The maximum number of points that can be displayed without overlap on a CRT is referred to as the resolution.

4. Write the types of clipping?

Point clipping, line clipping, area clipping, text clipping and curve clipping.

5. Define pixel?

Pixel is shortened forms of picture element. Each screen point is referred to as pixel or pel.

6. What is frame buffer?

Picture definition is stored in a memory area called frame buffer or refresh buffer.

7. What is point in the computer graphics system?

The point is a most basic graphical element & is completely defined by a pair of user coordinates (x, y).

8. Write short notes on lines?

A line is of infinite extent can be defined by an angle of slope q and one point on the line P=P(x,y). This can also be defined as y=mx+C where C is the Yintercept.

9. Define Circle?

Circle is defined by its center xc, yc and its radius in user coordinate units. The equation of the circle is (x-xc) + (y-yc) = r2.

10. What are the various attributes of a line?

The line type, width and color are the attributes of the line. The line type includes solid line, dashed lines, and dotted lines.

11. What is Transformation?

Transformation is the process of introducing changes in the shape size and orientation of the object using scaling rotation reflection shearing & translation etc.

12. What is translation?

Translation is the process of changing the position of an object in a straight-line path from one coordinate location to another. Every point (x , y) in the object must under go a displacement to (x|,y|). the transformation is: x’ = x + tx ; y’ = y+ty

13. What is rotation?

A 2-D rotation is done by repositioning the coordinates along a circular path, in the x-y plane by making an angle with the axes. The transformation is given by:

X’ = r cos (q + f) and Y’ = r sin (q + f).