Revit Secondary Development: Constructing Continuous Rigid Frame Bridges - Method 1

Building a continuous rigid frame bridge is not particularly difficult; the process is primarily driven by code. Many talented developers use Dynamo to achieve this, and I believe it’s quite effective. I have also utilized Dynamo for this purpose, although I find using dedicated plugins more enjoyable.

The core concept is straightforward: place the family in the correct position, retrieve the family parameters, and then modify those parameters accordingly.

You can watch the final result in this video: __AI_S_TURL_0__

using System;
using System.Collections.Generic;
using Autodesk.Revit.UI;
using Autodesk.Revit.DB;

namespace BuildBridgeQuick
{
    [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
    [Autodesk.Revit.Attributes.Journaling(Autodesk.Revit.Attributes.JournalingMode.NoCommandData)]
    [Autodesk.Revit.Attributes.Regeneration(Autodesk.Revit.Attributes.RegenerationOption.Manual)]
    public class Class1 : IExternalCommand
    {
        public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
        {
            Document revitDoc = commandData.Application.ActiveUIDocument.Document; // Access the document
            Application revitApp = commandData.Application.Application; // Access the application
            UIDocument uiDoc = commandData.Application.ActiveUIDocument; // Access the active UI document

            // Select a single box girder instance with variable cross-section
            Selection sel = uiDoc.Selection;
            Reference ref1 = sel.PickObject(ObjectType.Element, "Select a variable cross-section box girder instance");
            Element elem = revitDoc.GetElement(ref1);
            FamilyInstance familyInstance = elem as FamilyInstance;

            if (familyInstance == null)
            {
                TaskDialog.Show("Error 1", "Box girder instance not selected. Please try again!");
                return Result.Failed;
            }

            // Extract the family type name and display it
            FamilySymbol symbol = familyInstance.Symbol;
            TempName.FamInsName = symbol.Name;

            // Open the parameter input form
            Form1 form1 = new Form1();
            form1.ShowDialog();

            List list = new List { elem.Id };
            ICollection elementIds = list;

            // Retrieve parameters of the variable cross-section box girder
            Parameter param1 = familyInstance.LookupParameter("iH");    // Height of section i
            Parameter param2 = familyInstance.LookupParameter("iHI5");  // Height of i-section bottom plate
            Parameter param3 = familyInstance.LookupParameter("iT");    // Width of i-section web plate
            Parameter param4 = familyInstance.LookupParameter("iHI1");  // Height of i-section top plate
            Parameter param5 = familyInstance.LookupParameter("jH");    // Height of section j
            Parameter param6 = familyInstance.LookupParameter("jHI5");  // Height of j-section bottom plate
            Parameter param7 = familyInstance.LookupParameter("jT");    // Width of j-section web plate
            Parameter param8 = familyInstance.LookupParameter("jHI1");  // Height of j-section top plate
            Parameter param9 = familyInstance.LookupParameter("BeamLength"); // Segment length
            Parameter param10 = familyInstance.LookupParameter("detZ"); // Height difference between two sections (Z axis)
            Parameter param11 = familyInstance.LookupParameter("detY"); // Height difference between two sections (Y axis)

            int j = 0;
            for (int i = 0; i < ListData.List_SJGC.Count - 1; i++)
            {
                j = i + 1;

                // Update family parameters according to the data in ListData
                using (Transaction transaction1 = new Transaction(revitDoc, "Change Family Parameters"))
                {
                    transaction1.Start();
                    param1.Set(ListData.List_XLG[i] / 304.8);
                    param2.Set(ListData.List_DBH[i] / 304.8);
                    param3.Set(ListData.List_FBH[i] / 304.8);
                    param4.Set(ListData.List_TBH[i] / 304.8);
                    param5.Set(ListData.List_XLG[j] / 304.8);
                    param6.Set(ListData.List_DBH[j] / 304.8);
                    param7.Set(ListData.List_FBH[j] / 304.8);
                    param8.Set(ListData.List_TBH[j] / 304.8);
                    param9.Set(ListData.List_JDCD[j] / 304.8);
                    param10.Set(ListData.List_SJGC[i] / 304.8 - ListData.List_SJGC[j] / 304.8);
                    param11.Set(ListData.List_Y[i] / 304.8 - ListData.List_Y[j] / 304.8);
                    transaction1.Commit();
                }

                // Place the updated family instance at the corresponding position
                using (Transaction transaction2 = new Transaction(revitDoc, "Copy the family to the corresponding location"))
                {
                    transaction2.Start();
                    XYZ targetPoint = new XYZ(ListData.List_X[i] / 304.8, ListData.List_Y[i] / 304.8, ListData.List_SJGC[i] / 304.8);
                    LocationPoint familyInstancePoint = familyInstance.Location as LocationPoint;
                    XYZ translation = new XYZ(
                        ListData.List_X[i] / 304.8 - familyInstancePoint.Point.X,
                        ListData.List_Y[i] / 304.8 - familyInstancePoint.Point.Y,
                        ListData.List_SJGC[i] / 304.8 - familyInstancePoint.Point.Z);
                    ElementTransformUtils.CopyElements(revitDoc, elementIds, translation);
                    transaction2.Commit();
                }
            }

            // Clear data stored in ListData
            ListData.List_DBH.Clear();
            ListData.List_FBH.Clear();
            ListData.List_JDCD.Clear();
            ListData.List_SJGC.Clear();
            ListData.List_TBH.Clear();
            ListData.List_X.Clear();
            ListData.List_XLG.Clear();
            ListData.List_Y.Clear();

            return Result.Succeeded;
        }
    }
}

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