How to draw Line Profile on invisible image?

Tony · November 2021

Hi guys,

I create an invisible image and I want to draw Line Profile on it .
But it pop up an error message about
'Unable to cast COM object of type 'MediaCy.IQL.Engine.McImageClass' to interface type 'MediaCy.IQL.Application.IMcDocument'.

Image: https://us.v-cdn.net/5020878/uploads/editor/ut/u34nmah5oj2u.jpg

[code]

Dim im As McImage = ThisApplication.ActiveImage
Dim invisible_im As McImage = im.Duplicate(mcImageCreateFlags.mcicfNotVisible) 'Create invisible image

With Measure.LineProfile.ProfileCommands.Add(Nothing)
     .ProfileType = LineProfile.ProfileTypes.Line
     .Points = New System.Collections.Generic.List(Of System.Drawing.PointF)
     .Points.Add(New System.Drawing.PointF(1689, 1116))
     .Points.Add(New System.Drawing.PointF(1952, 1116))
     .Angle = 0R
     .CreateEngine = true
     .Run(invisible_im) 'Draw Line Profile on invisible image
End With

Can I draw Line Profile on invisible image?

Please help me to solve this annoying problem, thanks!

NikitaRG · November 2021

Hi Tony,

Line Profile commands works with IMcDocument (visible image or image set) and will not work with invisible image. As workaround you can create McLines instance attached to invisible image (Ex: Dim lines As McLines = McApplication.ThisApplication.CreateOperator("McLines", MyInvisibleImage, "MYLines")) and use lines.Profiles to analyze edges.

Thanks,
Nikita.

NikitaRG · November 2021

Hi Tony,

With small modifications in the macro you can create invisible document and use it with the line profile commands:

    Public Function InvisibleDocument() As SimpleScript
        InvisibleDocument = New SimpleScript
        Dim im1, doc1, win1
        
        With Automate.ScriptingCommands.CodeCommand(InvisibleDocument)
            If .Run() Then
                ' User Code Here
                im1 = .Application.ActiveImage.Duplicate(mcImageCreateFlags.mcicfNotVisible) 'create invisible image
                doc1 = .Application.Documents.Add(im1) 'create invisible document
            End If
        End With

        With Measure.LineProfile.ProfileCommands.RemoveAll(InvisibleDocument)
            .CreateEngine = True 'force to create line profile engine for invisible document
            .Run(doc1)
        End With

        With Measure.LineProfile.ProfileCommands.Add(InvisibleDocument)
            .Text = "Add Profile"
            .ProfileType = LineProfile.ProfileTypes.Line
            .Points = New System.Collections.Generic.List(Of System.Drawing.PointF)
            .Points.Add(New System.Drawing.PointF(10F,10F))
            .Points.Add(New System.Drawing.PointF(100F,100F))
            .Angle = 0R
            .Run(doc1)
        End With

        With Application.DocumentCommands.Show(InvisibleDocument)
            .Run(doc1, win1)'show document
        End With

    End Function

Key modifications:

1) create invisible document from the invisible image

doc1 = .Application.Documents.Add(im1) 'create invisible document

2) force to create line profile engine (.CreateEngine = True should be set on the first line profile command)

.CreateEngine = True

Remember to close invisible document to free up the memory.

Nikita.

Tony · December 2021

Thanks Nikita,

This is of great help to me!

How to draw Line Profile on invisible image?

Answers