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IMcPointsSignature Property

A signature of one or all features.

Namespace:  MediaCy.IQL.Features
Assembly:  MediaCy.IQL.Features (in MediaCy.IQL.Features.dll) Version: 10.0.6912.0
Syntax
VB
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ReadOnly Property Signature ( 
	Optional FeatureIndex As Integer = -1
) As Integer
	Get

Parameters

FeatureIndex (Optional)
Type: SystemInt32
The index of the feature for which the signature is desired, or -1 for a signature of all features combined.

Property Value

Type: Int32

Implements

IMcFeaturesSignatureInt32
Remarks
Property changed notifications are sent when any feature changes, but there are some cases where it must be determined if a particular feature is still the same as it was before the property change. The Signature can be used to detect quickly if a feature has changed from some earlier state. The computed Signature value depends only on the coordinates of the feature(s); it does not depend on the OptionFlags or on the FeatureStatusFlags.
Examples
VB
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'Example 1. Check to see if the AOI is the same as it was at some previous time
Dim lAoiSignature As Long
lAoiSignature = ThisApplication.ActiveImage.Aoi.Signature
Debug.Print "The AOI signature is: " & lAoiSignature
'...
'some time later
if lAoiSignature = ThisApplication.ActiveImage.Aoi.Signature Then
Debug.Print "The AOI is the same as it was."
Else
Debug.Print "The AOI region(s) and/or coordinates have changed."
End If
'Example 2. Check for movement of a single feature
With ThisApplication.ActiveImage.PointFeatures
'Create two points
.SetFeaturePoints -1, Array(10, 10, 20, 20)
Debug.Print "The signatures are: " & .Signature(0), .Signature(1)
'Move the first point only
.SetFeaturePoints 0, Array(15, 15)
Debug.Print "After 1st point moved: " & .Signature(0), .Signature(1)
End With
See Also