Question

Expansion of line DDA algorithm is *​

Answer 1

Answer:

Expansion of line DDA algorithm is

A

Digital difference analyzer

B

Direct differential analyzer

C

Digital differential analyzer

D

Data differential analyzer

Answer 2

Answer:

The Digital differential Analyzer(DDA) is a scan-conversion line algorithm.

Explanation:

• DDA algorithm is summarized in the following procedure, which accepts as input the two endpoint pixel positions.
• Horizontal and vertical differences between the endpoint positions are assigned to parameters dx and dy.
• The difference with the greater magnitude determines the value of parameter steps.
• Starting with pixel positions ( $x_a$, $y_{a}$ ), we determine the offset needed at each step to generate the next pixel position along the line path. We loop through this process steps many times.
• If the magnitude of dx is greater than the magnitude of dy and xa is less than xb, the values of the increments in the x and y directions are 1 and m, respectively.  
• If the greater change is in the x direction but xa is greater than xb, then the decrements -1 and -m are used to generate each new point on the line.
• Otherwise, we use a unit increment ( or decrement ) in the y direction and an x increment ( or decrement ) of 1/m.