point in polygon

To determine if a point is inside a polygon, you can use the ray-casting algorithm. Here are the steps:

1. First, count the number of times a ray drawn from the point intersects with the edges of the polygon.

2. If the number of intersections is odd, the point is inside the polygon. If it's even, the point is outside the polygon.

3. To implement this algorithm, you can iterate through each edge of the polygon and check if the ray intersects with it. Use a loop to compare the y-coordinate of the point with the y-coordinates of the polygon's vertices to determine if the ray intersects with the edge.

4. Make sure to handle special cases such as when the ray coincides with an edge or a vertex of the polygon.

5. After iterating through all the edges, return whether the number of intersections is odd or even to determine if the point is inside the polygon.

Remember to handle edge cases and consider the orientation of the edges when implementing the ray-casting algorithm in C++. Good luck with your implementation!