Replies to This Discussion

Permalink Reply by peter fotiadis on August 30, 2015 at 1:37am

This is easy but I can't get the gist of what your input is (flat rectangles == ???).

Post a Rhino file (or better the def + internalized data)

Permalink Reply by Petras Vestartas on August 30, 2015 at 6:14am

 Here is the code, and there is a printscreen attached what I want to do.

Isuue: When i offset joined boundary curves, they are exploded.

//OUTPUT
        protected override void RegisterOutputParams(GH_Component.GH_OutputParamManager pManager)
        {

            pManager.AddCurveParameter("Glass", "G", "Glass surfaces", GH_ParamAccess.list);
 
        }

//INPUT

        protected override void SolveInstance(IGH_DataAccess DA)
        {

            Brep glassSrf = new Brep();
            double frameWidth = 1.0;

            // When data cannot be extracted from a parameter, we should abort this method.
            if (!DA.GetData(0, ref glassSrf)) return;
            if (!DA.GetData(1, ref frameWidth)) return;

            List<Curve> glass = CreateGlass(glassSrf, frameWidth);

            for (int i = 0; i < glass.Count; i++)
            {
                DA.SetData(0, glass[i]);
            }

        }

//MAIN FUNCTION

        private List<Curve> CreateGlass(Brep glassSrf, double frameWidth)
        {
            Brep glass = glassSrf;
            Curve[] wireframe = glass.DuplicateEdgeCurves(true);
            Curve[] wireframeJoined = Curve.JoinCurves(wireframe);

            List<Curve> outlines = new List<Curve>();

            for (int i = 0; i < wireframeJoined.Length; i++)
            {
                outlines.AddRange(wireframeJoined[i].Offset(Plane.WorldXY, frameWidth, 0, 0));

               // when I offset joined polyline it becomes exploded.
            }

            return outlines;
        }

Attachments:

• output.png, 144 KB

Permalink Reply by Daniel González Abalde on August 30, 2015 at 6:23am

If you are sure that your curves always be polylines, you can try to pass each joined curve to PolylineCurve class, which has offset methods, perhaps these will work better.

Permalink Reply by Petras Vestartas on August 30, 2015 at 7:36am

How to pass correctly pass Curves to PolylineCurves?

PolylineCurve[] pl = PolylineCurve.JoinCurves(wireframe);

This line does not work, stating that:

Cannot implicitly convert type 'Rhino.Geometry.Curve[]' to 'Rhino.Geometry.PolylineCurve[]'. An explicit conversion exists (are you missing a cast?)   

Permalink Reply by Daniel González Abalde on August 30, 2015 at 8:54am

Mmmm, forget that, perhaps the problem is that you're giving CurveOffsetCornerStyle.None in the last parameter of the offset (value 0), try other styles:

CurveOffsetCornerStyle Enumeration

See Also Send Feedback

Defines enumerated values for all implemented corner styles in curve offsets.

Namespace: Rhino.Geometry
Assembly: RhinoCommon (in RhinoCommon.dll) Version: 5.1.30000.12 (5.0.20693.0)

Syntax

C#
public enum CurveOffsetCornerStyle

Visual Basic
Public Enumeration CurveOffsetCornerStyle

Members

	Member name	Value	Description
	None	0	The dafault value.
	Sharp	1	Offsets and extends curves with a straight line until they intersect.
	Round	2	Offsets and fillets curves with an arc of radius equal to the offset distance.
	Smooth	3	Offsets and connects curves with a smooth (G1 continuity) curve.
	Chamfer	4	Offsets and connects curves with a straight line between their endpoints.

Permalink Reply by Petras Vestartas on August 30, 2015 at 10:23am

Thanks for your time and help.

This works perfectly:

outlines.AddRange(wireframeJoined[i].Offset(Plane.WorldXY, frameWidth, 0.1, CurveOffsetCornerStyle.Sharp));

Kind Regards,

Petras