How to extract coordinates from an array of coordinate points

Question

I'm trying to find the coordinates of the centroid of the projected image from the SURF example.

The example has an array of points like this : PointF[] pts = new PointF[] The result of these points are as follows as seen in debugger : X1,Y1 - Top Left X2,Y2 - Top Right X3,Y3 - Bottom Left X4,Y4 - Bottom Right

I want to extract the values as int or double so that I can calculate the centroid. How do I do this?

Answer 1

If i understand your question, you have an array of PointF, so you want to access to each coordinates:

IF your array contains 2 elements, you have pts[0] and pts[1], so you could access X and Y like that:

pts[0].X, pts[0].Y and so on...

Answer 2

Not sure I follow your question. PointF has a X and Y properties that are both float are you asking how to access them in the array?

PointF[] pts = ...
pts[index].X; // this will get you the X value for the PointF at the given index

If you have a method the takes int or double that you want to pass these values to then a simple cast will get you what you need

double x = (double)pts[index].X;

If there's something else that you don't understand could you elaborate in your question?