In the midpoint ellipse drawing algorithm, the decision to switch from Region 1 to Region 2 of the first quadrant of an ellipse occurs based on the midpoint of the region's boundary. This algorithm divides the ellipse into different regions and iteratively calculates points along its boundary.
To switch from Region 1 to Region 2 in the first quadrant, the algorithm typically compares the midpoint of the region with a decision parameter. The condition for this transition is usually based on the value of a function that represents the ellipse's boundary.
The general condition for switching from Region 1 to Region 2 in the midpoint ellipse drawing algorithm is:
This transition condition ensures that the algorithm progresses along the ellipse's boundary accurately while minimizing the number of calculations required.