Reverse a List

Hi Wayne,

thanks for your hints.

I know the forum probably is the best place for getting good advice for tricky problems. But sometimes it probably would help if there was a solid way to get some basics explained.

For anyone following: here are some good ones. But I like just plain text help too - so if anyone has some knowlege of a manual out there please post.

And Wayne I'm looking forward to your video package - any help is appreciated.

Ingo

Hi Rafael,

I tried a bit with this one.

It seem as if the syntax has to be the other way round:

transaction 1 modelChange 'Add baseCS'
{
    node User.Objects.baseCS Bentley.GC.NodeTypes.CoordinateSystem
    {
        Technique                 = 'AtModelOrigin';
        DGNModelName              = 'Design Model';
        SymbolSize                = 1;
    }
}

transaction 2 modelChange 'Add line1, line1_EndPoint, line1_StartPoint, line2, line2_EndPoint, line2_StartPoint'
{
    node User.Objects.line1_EndPoint Bentley.GC.NodeTypes.Point
    {
        Technique                 = 'OnPlane';
        Plane                     = baseCS.XYPlane;
        XTranslation              = <free> 16509.8223048126;
        YTranslation              = <free> 610.905526160702;
        Color                     = -1;
        LevelName                 = 'A-WALL-CONC';
        LineStyleName             = 'STYLE_ByLevel';
        LineWeight                = -1;
    }
    node User.Objects.line1_StartPoint Bentley.GC.NodeTypes.Point
    {
        Technique                 = 'OnPlane';
        Plane                     = baseCS.XYPlane;
        XTranslation              = <free> 6637.58036974987;
        YTranslation              = <free> 538.358987137388;
        Color                     = -1;
        LevelName                 = 'A-WALL-CONC';
        LineStyleName             = 'STYLE_ByLevel';
        LineWeight                = -1;
    }
    node User.Objects.line1 Bentley.GC.NodeTypes.Line
    {
        Technique                 = 'ByPoints';
        StartPoint                = line1_StartPoint;
        EndPoint                  = line1_EndPoint;
        Color                     = -1;
        LevelName                 = 'A-WALL-CONC';
        LineStyleName             = 'STYLE_ByLevel';
        LineWeight                = -1;
    }
    node User.Objects.line2_StartPoint Bentley.GC.NodeTypes.Point
    {
        Technique                 = 'OnPlane';
        Plane                     = baseCS.XYPlane;
        XTranslation              = <free> 16840.6576261299;
        YTranslation              = <free> -5076.57885616648;
        Color                     = -1;
        LevelName                 = 'A-WALL-CONC';
        LineStyleName             = 'STYLE_ByLevel';
        LineWeight                = -1;
    }
    node User.Objects.line2_EndPoint Bentley.GC.NodeTypes.Point
    {
        Technique                 = 'OnPlane';
        Plane                     = baseCS.XYPlane;
        XTranslation              = <free> 6445.86233955;
        YTranslation              = <free> -5147.35756845185;
        Color                     = -1;
        LevelName                 = 'A-WALL-CONC';
        LineStyleName             = 'STYLE_ByLevel';
        LineWeight                = -1;
    }
    node User.Objects.line2 Bentley.GC.NodeTypes.Line
    {
        Technique                 = 'ByPoints';
        StartPoint                = line2_StartPoint;
        EndPoint                  = line2_EndPoint;
        Color                     = -1;
        LevelName                 = 'A-WALL-CONC';
        LineStyleName             = 'STYLE_ByLevel';
        LineWeight                = -1;
    }
}

transaction 3 modelChange 'Add point1, point2'
{
    node User.Objects.point2 Bentley.GC.NodeTypes.Point
    {
        Technique                 = 'ByNumberAlongCurve';
        Curve                     = line2;
        NumberAlongCurve          = 5;
    }
    node User.Objects.point1 Bentley.GC.NodeTypes.Point
    {
        Technique                 = 'ByNumberAlongCurve';
        Curve                     = line1;
        NumberAlongCurve          = 5;
    }
}

transaction 4 modelChange 'Add expression1'
{
    node User.Objects.expression1 Bentley.GC.NodeTypes.Expression
    {
        Technique                 = 'Default';
        Value                     = from r in point2 orderby r.X;
    }
}

transaction 5 modelChange 'Add line3; change expression1, line2, line2_EndPoint, line2_StartPoint, point1, point2'
{
    node User.Objects.line2_StartPoint Bentley.GC.NodeTypes.Point
    {
        GraphLocation             = {332.537, 403.003, 0.0, 142.443};
    }
    node User.Objects.line2_EndPoint Bentley.GC.NodeTypes.Point
    {
        GraphLocation             = {332.537, 585.446};
    }
    node User.Objects.line2 Bentley.GC.NodeTypes.Line
    {
        GraphLocation             = {606.537, 403.003};
    }
    node User.Objects.point1 Bentley.GC.NodeTypes.Point
    {
        GraphLocation             = {915.579, 36.317};
    }
    node User.Objects.point2 Bentley.GC.NodeTypes.Point
    {
        GraphLocation             = {943.433, 339.438};
    }
    node User.Objects.expression1 Bentley.GC.NodeTypes.Expression
    {
        GraphLocation             = {1181.222, 138.884};
    }
    node User.Objects.line3 Bentley.GC.NodeTypes.Line
    {
        Technique                 = 'ByPoints';
        StartPoint                = point1;
        EndPoint                  = expression1;
        GraphLocation             = {1342.411, 336.653};
    }
}

transaction 6 modelChange 'Change line3 support'
{
    node User.Objects.line3 Bentley.GC.NodeTypes.Line
    {
        Technique                 = 'ByPoints';
        EndPoint                  = Reverse(point2);
    }
}

The last one shows the support change.

EndPoint    = Reverse(point2)

Even if Wayne's solution looks cooler I find this a bit more understandable.

regards

Ingo

Because Reverse is a method on the "list" point4, it needs the parentheses behind its name:

point4.Reverse()

Then this should work just fine.

... so it is not intended that Reverse(point4) works too?

Hi Ingo,

That is a good question:

Reverse(point4) is working out of legacy reasons to retain compatibility for older scripts when GC had list functions instead of leveraging list methods. List functions have been deprecated.

For new scripts, the preferred approach is to use list methods, i.e. point4.Reverse(). Intent is that all previously existing GC list functions are available as methods, plus list methods provided through the dot Net Framework, thus extending the toolset available for list manipulation and computations on lists.

Regards,

     Volker