Prepare an initial sorted edge list, Computer Graphics

Q: For the following polygon, prepare an initial sorted edge list and then make the active edge list for scan lines y = 5,20,30,35 Coordinates of the vertices are as shown in Figure.

733_prepare an initial sorted edge list.png

Answer: First label the vertices and edges as shown in the Figure

1859_prepare an initial sorted edge list 1.png


Start with y = 0 and continue till y = 40. For y = 0 there are four edges, namely E0, E1, E2 and E3.  The sorted edge table is created as follows:

2001_prepare an initial sorted edge list 2.png

Active edge lists (AEL) for scan lines y = 5, 20, 30, 35 are as follows.

Y = 5, AEL = { E0, E1, E2, E3}

Y = 20, AEL = { E6, E3}

Y = 30, AEL = { E6, E5, E4, E3}

Y = 35, AEL = { E6, E5, E4, E3}




Posted Date: 4/26/2013 2:41:02 AM | Location : United States

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