コード例 #1
0
        public override void Evaluate(FSharpList <Value> args, Dictionary <PortData, Value> outPuts)
        {
            var pts = ((Value.List)args[0]).Item;

            if (pts.Length < 3)
            {
                throw new Exception("3 or more XYZs are necessary to form the best fit plane.");
            }

            var        ptList = BestFitLine.AsGenericList <XYZ>(pts);
            XYZ        meanPt;
            List <XYZ> orderedEigenvectors;

            BestFitLine.PrincipalComponentsAnalysis(ptList, out meanPt, out orderedEigenvectors);

            var normal = orderedEigenvectors[0].CrossProduct(orderedEigenvectors[1]);

            var plane = dynRevitSettings.Doc.Application.Application.Create.NewPlane(normal, meanPt);

            // take first 3 pts to form simplified normal
            var bma = ptList[1] - ptList[0];
            var cma = ptList[2] - ptList[0];

            var simplifiedNorm = bma.CrossProduct(cma);

            // find sign of normal that maximizes the dot product pca normal and simplfied normal
            var dotProd = simplifiedNorm.DotProduct(normal);

            if (dotProd < 0)
            {
                normal = -1 * normal;
            }

            outPuts[_planePort]  = Value.NewContainer(plane);
            outPuts[_normalPort] = Value.NewContainer(normal);
            outPuts[_originPort] = Value.NewContainer(meanPt);
        }