AEC DevBlog

Hide Revit group via API

Joe Ye

 

Through Revit UI command, we can hide group by picking it and click the hide command like other elements. Howerver I cannot hide group via API.

Here is the DevelopSharp code I used.
        public void hidegroup()
        {
            Document doc = this.ActiveUIDocument.Document;
            Selection sel = this.ActiveUIDocument.Selection;           
            Reference ref1 = sel.PickObject(ObjectType.Element,"Please pick a group");
            Element elem = doc.GetElement(ref1);
           
            IList<ElementId> lists = new List<ElementId>();
            lists.Add(elem.Id);
           
            Transaction trans = new Transaction(doc);
            trans.Start("hidegroup");
            doc.ActiveView.HideElements(lists);
            trans.Commit ();
          
        }

Launch the command, pick any group,  error occurs. The error message is :
Revit failed to execute hidegroup.
A problem has been detected.

Then how can we hide a group? Any tricks?

 

Solution

Groups cannot be hidden or overridde like ordinary elements. In order to hide a group, we need to hide the element set in that group by HideElements() method. The good aspect is that we can hide part of a group.

Here is the code to hide the whole group.

public void hidegroup()
{
    Document doc = this.ActiveUIDocument.Document;

    Selection sel = this.ActiveUIDocument.Selection;   

    Reference ref1 = sel.PickObject(ObjectType.Element,"Please pick a group");

    Element elem = doc.GetElement(ref1);

    IList<ElementId> lists = new List<ElementId>();

    Group g = elem as Group;

    IList<ElementId> ids = g.GetMemberIds();

    Transaction trans = new Transaction(doc);

    trans.Start("hidegroup");

    this.ActiveUIDocument.ActiveView.HideElements(ids);

    trans.Commit ();

}

Closest Grid Point Intersection to an Object

By Xiaodong Liang

Question:

I'm trying to create a plugin to add to a specific/selected object the closest grid intersection point in a property user tab.This should basically be similar to what the clash detective "Grid Intersection" shows. 
Should I use the "GridIntersection Class" to do this? And if so, where should I start?

Solution:
Given a referenced point, you can use GridSystem.ClosestIntersection(point) to get the closest GridIntersection which tells the postion, level, line1 and line2 of the intersection.
The referenced point of "Grid Intersection" in Clash Detective may probably be ClashResult.Center.
In this case, we could use the BoundingBox center of the object we are interested in. or BoundingBox Max or Min.
The following code is based on ToolsPlugin which is introduced from Navisworks 2014. In custom tool mode, the closest grid insection point will be marked as a sphere graphics when the user selects an object.

using Autodesk.Navisworks.Api;

using Autodesk.Navisworks.Api.Plugins;

 

namespace CustomGraphics

{

    // The ToolPlugin example.

    [Plugin("ToolPluginTest", "ADSK")]

    public class ToolPluginTest : ToolPlugin

    {

        public ModelItem clickedModel = null;

 

        public override bool MouseDown(View view,

                            KeyModifiers modifiers,

                            ushort button,

                            int x,

                            int y,

                            double timeOffset)

        {

            // get current selection

            PickItemResult itemResult =

                view.PickItemFromPoint(x, y);

            if (itemResult != null)

            {

                clickedModel =

                    itemResult.ModelItem;

                Application.ActiveDocument.ActiveView.

                               RequestDelayedRedraw(ViewRedrawRequests.Render);

            }

            return false;

        }

 

        public Point3D GetClosestGridIntersection()

        {         

 

            //check that selection is valid

            if (clickedModel != null)

            {

                //Get bounding box of the selection

                BoundingBox3D bb3d =

                   clickedModel.BoundingBox();

 

                GridSystem oGS = Autodesk.Navisworks.Api.Application.ActiveDocument.Grids.ActiveSystem;

 

                if (oGS != null)

                //get the closest grid intersection point

                {

                    GridIntersection oGridIntersection = oGS.ClosestIntersection(bb3d.Center);

 

                    return oGridIntersection.Position;

                }

            }

 

            return null;

        }

 

        public override void OverlayRenderModel(View view, Graphics graphics)

        {

            if (clickedModel != null)

            {

                //color for graphics

                Color yellow = Color.FromByteRGB(255, 255, 0);

                graphics.Color(yellow, 0.8);

 

                //center of the current selection

                Point3D oCenter = GetClosestGridIntersection();

 

                if (oCenter != null)

                    //draw a Sphere

                    graphics.Sphere(oCenter, 1);

            }

        }

    }

 

    [Plugin("EnableToolPluginExample", "ADSK",

         DisplayName = "EnableToolPlugin")]

    public class EnableToolPluginExample : AddInPlugin

    {

        static bool enable = false;

        public override int Execute(params string[] parameters)

        {

            if (enable)

            {

                //switch to the native tool

                Application.MainDocument.Tool.Value = Tool.Select;

                //switch to custom tool

                ToolPluginRecord toolPluginRecord =

                    (ToolPluginRecord)Application.Plugins.FindPlugin(

                                                     "ToolPluginTest.ADSK");

                ToolPluginTest oPlugin = (ToolPluginTest)toolPluginRecord.LoadedPlugin;

                oPlugin.clickedModel = null;

            }

            else

            {

                //switch to custom tool

                ToolPluginRecord toolPluginRecord =

                    (ToolPluginRecord)Application.Plugins.FindPlugin(

                                                     "ToolPluginTest.ADSK");

                Application.MainDocument.Tool.

                    SetCustomToolPlugin(toolPluginRecord.LoadPlugin());

            }

            enable = !enable;

            return 0;

        }

    }

 

}