UGC NET Computer Science December 2019 | Question 120

Question 120

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Consider the following statements with respect to approaches to fill area on raster systems :
P: To determine the overlap intervals for scan lines that cross the area.
Q: To start from a given interior position and paint outward from this point until we encounter the specified boundary conditions.
Select the correct answer from the options given below :

1. 1. P only
2. 2. Q only
3. 3. Both P and Q
4. 4. Neither P nor Q

Answer : 3. Both P and Q

Explanation Question 120

Both Statements are true with respect to Area fill methods and simply are part of definition of scan line and boundary fill methods.

So, option 3 is correct answer

Filled Area Primitives
Two basic approaches to area filling on raster systems:

• Determine the overlap intervals for scan lines that cross the area (scan-line)
• Start from an interior position and point outward from this point until the boundary condition reached (fill method)
• Scan-line: simple objects, polygons, circles,..
• Fill-method: complex objects, interactive fill.

Reference 1 : SCAN-LINE FILL ALGORITHMS - Filled Area Primitives - scan-line and fill method

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UGC NET CS December 2019 - Question 119	UGC NET CS December 2019 - Question 121