top = 1;
bottom = 2;
left = 1;
right = 2;
Will give us the values:
When you say top or bottom do you mean the column (or row)?
And then left or right is the row (or column)?
Then the element at top=1,left=1 is is on the first row in the first column
This would give ONE of the values (the x or the y?) of the four needed to define two points.
How do you get the other value (the y or the x) needed for the point.
How do you get the indexes for the other point(each point has an x and y value)