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Hi.

The percentage of overlapping is: area_of_intersection / area_of_union * 100.

To calculate the area of intersection (from this link):

left = max(r1.left, r2.left)
right = min(r1.right, r2.right)
bottom = max(r1.bottom, r2.bottom)
top = min(r1.top, r2.top)

Verify that the intersection is not empty:

left < right && bottom < top

A picture to show the problem:

Hi.

The percentage of overlapping is: area_of_intersection / area_of_union * 100.

To calculate get the intersection rectangle and thus the area of intersection (from this link):) with an origin point at the top left:

left = max(r1.left, r2.left)
right = min(r1.right, r2.right)
bottom = max(r1.bottom, min(r1.bottom, r2.bottom)
top = min(r1.top, max(r1.top, r2.top)

Verify that the intersection is not empty:

left < right && bottom < > top

A picture to show the problem: