Question / Problem:
How do I calculate the overlap of 2 fields?
Answer / Solution:
The following code calculates the overlap of two fields, words, alternatives, locators, etc. as a number from 0.0 (no overlap) to 1.0 (perfect overlap):
Public Function FieldOverlap(a As Object, b As Object) As Double 'returns percentage overlap of two fields,subfields, locators, alternatives... '(0.0 if no overlap, 1.0 if perfect overlap) FieldOverlap = 0 'Check if fields are on the same page and that both exist If a.PageIndex <> b.PageIndex Or a.PageIndex = -1 Then Exit Function Dim overlapArea As Double overlapArea = Max((Min(a.Left + a.Width, b.Left + b.Width) - Max(a.Left, b.Left)), 0) _ * Max((Min(a.Top + a.Height, b.Top + b.Height) - Max(a.Top, b.Top)), 0) FieldOverlap = overlapArea / Max(a.Width * a.Height, b.Width * b.Height) End Function Private Function Max(v1 As Long, v2 As Long) As Long If v1 > v2 Then Max = v1 Else Max = v2 End Function Private Function Min(v1 As Long, v2 As Long) As Long If v1 < v2 Then Min = v1 Else Min = v2 End Function