Wire.GetLengthAtPoint returns wrong value

RobotStudio
1

RS 5.12

The uploaded .zip file includes a Pack&Go station and a VB Add-in.
webwiz/40/WireTest4.zip

The API help for ‘Wire.GetLengthAtPoint’ states:
“Returns the curve length from the start point of the wire to the supplied point on the wire.”

This is my code:. . dblMyWireLen = bdyMyWire.Shells(0).Wires(0).Length 'get wire length . . 'Display data when selection changed Public Sub SelectionChanged(ByVal sender As Object, ByVal e As GraphicPickEventArgs) If e.PickedObject IsNot Nothing Then Dim dblLengthAtPoint As Double 'distance along wire of selected point dblLengthAtPoint = bdyMyWire.Shells.Item(0).Wires.Item(0).GetLengthAtPoint(e.PickedPosition) Logger.AddMessage(New LogMessage("Selected object type = " & e.PickedObject.TypeDisplayName & _ "; dblLengthAtPoint = " & dblLengthAtPoint & "; Wire Length = " & dblMyWireLen)) End If End Sub
When I click at different points on a wire ‘GetLengthAtPoint(e.PickedPosition)’ returns a constant value which is equal to the value returned by Wire.Length.

Is this a bug or have I made an error?

Thanks,

Kevin

2

Bump:

I would be grateful if someone would confirm that this is a bug in RS or point out my error.

Thanks,

Kevin

3

Hi Kevin,

GetLengthAtPoint expects a local coordinate (relative to the containing Part) while GraphicPickEventArgs always contains a global coordinate.
Sample C# code:

static void GraphicPicker_GraphicPick(object sender, GraphicPickEventArgs e) { Wire wire = e.PickedObject as Wire; if (wire != null) { Matrix4 mat = ((Part)wire.Body.Parent).Transform.GlobalMatrix; mat.InvertRigid(); Vector3 local = mat.MultiplyPoint(e.PickedPosition); Logger.AddMessage(new LogMessage(wire.GetLengthAtPoint(local).ToString())); } }
regards,
Johannes

4

Thanks for the explanation and example, Johannes.

Regards,

Kevin