Hi,

The code below sets a renderer to my point shapefile. When the layer is loaded all symbols are rendered correctly, however when I add a new point to the layer this is rendered using the default symbol. Only when I reload the layer the newly added point is rendered using the defined categories. A redraw or refresh of the map alone does not help.

Another problem is that the transparency does not seem to work. The transparent color I pass is coloured in a light gray.

This is the renderer code:

Private Sub ApplyRendererPointRefLayer()

        Dim sdo As MapWinGIS.ShapeDrawingOptions = mPointRef.DefaultDrawingOptions
        Dim index As Integer = mPointRef.Table.FieldIndexByName("sterkte")

        For i As Integer = 0 To 3
            Dim NetImage As New System.Drawing.Icon(mMapWin.Plugins.PluginFolder + "\GPR\Images\PRef" + i.ToString() + ".ico")

            Dim imgUtil As New ToolsImages
            Dim ico As New MapWinGIS.Image
            ico.Picture = imgUtil.ImageToIPictureDisp(CType(NetImage.ToBitmap(), System.Drawing.Image))
            ico.TransparencyColor = Convert.ToUInt32(System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.FromArgb(0, 128, 128)))
            ico.UseTransparencyColor = True

            mPointRef.Categories.Add(i.ToString())
            mPointRef.Categories.Item(i).Expression = "[sterkte]= " & i.ToString
            mPointRef.Categories.Item(i).DrawingOptions.PointType = MapWinGIS.tkPointSymbolType.ptSymbolPicture
            mPointRef.Categories.Item(i).DrawingOptions.Picture = ico

            mPointRef.Categories.ApplyExpression(i)

            ico = Nothing
        Next i

    End Sub

JosP

The first thing is simple: you should call Categories.ApplyExpression(i) after adding new shapes.
But I can't give a quick answer regarding transparency issue, I need to test the code.

Hope it'll help,
Sergei

Thanks Sergei, that worked.
I hope you can look into the transparency issue.

JosP

Jos,

It might be best to submit an issue report about the transparency so we don't forget.
Please go to bugs.mapwindow.org

Thanks en bedankt,

Paul

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Hi there,

Recently I downloaded MapWindow 4.8.6 and rendering point features with images does not work anymore, using the code and Sergei's suggestion above. The previous version did draw the images. This is a very serious issue for my project, could you please look into this?

The transparancy issue is less important to me, but is there any progress on this issue?

JosP