Topic: how to get ACI color from RGB?

[jmaeding]

I found a few posts close to what I want, but I am wondering if there is a built-in .net acad api function to do this.
I looked at the colorconverter class but did not see how that helped.
any ideas?  thanks

[Kerry]

System.Drawing.Color.FromArgb(ri,gi,bi);

I was going to add it into my color Lab http://www.theswamp.org/index.php?topic=14977.msg181469#msg181469
... but I got sidetracked. < and because of lack of response >

[jmaeding]

wow, I had no idea anything outside of acad had a similar thing to the acad palette.
I guess the 256 color acad system was modeled after something common a long time ago, before windows for sure.

[jmaeding]

hmm, I am not clear on how to get that back to an ACI index.  I looked at the objects involved, and the methods to do this do not stand out, any further tips?  thanks so far

[jmaeding]

oh, totally missed the lookupaci method of entitycolor class, that should do it...

[jmaeding]

so code is (so far):
Public Function SelectAcColor(ByVal inColor As AcCo.Color) As AcCo.Color
        Dim retColor As AcCo.Color = Nothing
        If inColor.ColorMethod <> ColorMethod.ByAci Then
            Dim ACI As Integer = AcCo.EntityColor.LookUpAci(inColor.Red, inColor.Green, inColor.Blue)
            inColor = AcCo.Color.FromColorIndex(ColorMethod.ByAci, ACI)
        End If
        Dim CD As New AcWi.ColorDialog
        CD.Color = inColor 'Set Color
        CD.SetDialogTabs(AcWi.ColorDialog.ColorTabs.ACITab)
        If CD.ShowDialog = DialogResult.OK Then            'If user clicked OK then
            retColor = CD.Color
        End If
        Return retColor
    End Function