topic Re: Viewport Layer Control? in .NET Forum

Viewport Layer Control?

Anonymous — Fri, 29 Jan 2010 19:04:51 GMT

I would like create a new layer and freeze it in all existing layout viewports. I've searched high and low for a vb.net example and have not had any success. If any of you good people could shed some light on how viewport layers are controlled I would be very thankful.

Re: Viewport Layer Control?

_gile — Fri, 29 Jan 2010 19:38:40 GMT

Hi,

The Viewport class provides a FreezeLayersInViewport method...

Re: Viewport Layer Control?

_gile — Fri, 29 Jan 2010 22:00:04 GMT

Here's a little C# sample (if needed, google for convert C# VB")

{code}using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.Colors;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Runtime;

namespace ClassLibrary1
{
public class Class1
{
[CommandMethod("TEST")]
public static void Test()
{
Document doc = Application.DocumentManager.MdiActiveDocument;
Database db = doc.Database;
using (Transaction tr = db.TransactionManager.StartTransaction())
{
// Create a new layer named "Test" color 30
LayerTable lt = (LayerTable)tr.GetObject(db.LayerTableId, OpenMode.ForWrite);
if (!lt.Has("Test"))
{
LayerTableRecord ltr = new LayerTableRecord();
ltr.Color = Color.FromColorIndex(ColorMethod.ByAci, 30);
ltr.Name = "Test";
ObjectId layerId = lt.Add(ltr);
tr.AddNewlyCreatedDBObject(ltr, true);
}

// Freeze "Test" layer in all viewports
ObjectId[] ids = new ObjectId[1] { layerId };
DBDictionary layoutDict = (DBDictionary)tr.GetObject(db.LayoutDictionaryId, OpenMode.ForRead);
foreach (DBDictionaryEntry entry in layoutDict)
{
if (entry.Key != "Model")
{
Layout lay = (Layout)tr.GetObject(entry.Value, OpenMode.ForRead);
foreach (ObjectId vpId in lay.GetViewports())
{
Viewport vp = (Viewport)tr.GetObject(vpId, OpenMode.ForWrite);
vp.FreezeLayersInViewport(ids.GetEnumerator());
}
}
}

tr.Commit();
}
}
}
}
{code}

Re: Viewport Layer Control?

Anonymous — Mon, 01 Feb 2010 17:47:43 GMT

Very useful. Your code has gotten me along way to completing my task. I'm having an issue running my version of your code from a paletteset. I've created a Class Vport with a New() subroutine that creates the layers and a FreezeLayersInAllLayouts() subroutine that freezes the newly created layers in all viewport but the current. A button on the paletteset creates a New Vport class object then freezes the layer then draw some entities in the current viewport. If I step through FreezeLayersInAllLayouts() in the debugger all works fine. If I run FreezeLayersInAllLayouts() without debugging the routine has no effect on the layer state in all the other viewports. See the following code for my adaptation of your code.

Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.AutoCAD.EditorInput
Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.Colors
Imports Autodesk.AutoCAD.Geometry

Public Class Vport
Private CVport As Viewport
Private CVportName As String
Private LayerIds(2) As ObjectId

Public Sub New()
Dim doc As Document = Application.DocumentManager.MdiActiveDocument
Dim ed As Editor = doc.Editor
Dim db As Database = doc.Database
Using DocLock As DocumentLock = Application.DocumentManager.MdiActiveDocument.LockDocument()
Using tr As Transaction = db.TransactionManager.StartTransaction()
CVport = DirectCast(tr.GetObject(ed.CurrentViewportObjectId, OpenMode.ForRead), Viewport)
Dim lt As LayerTable = DirectCast(tr.GetObject(db.LayerTableId, OpenMode.ForWrite), LayerTable)
Dim layerid As ObjectId
If Not lt.Has("PH-" + CVport.Handle.ToString()) Then
Dim ltr As LayerTableRecord = New LayerTableRecord()
ltr.Name = "PH-" + CVport.Handle.ToString()
ltr.Color = Color.FromColorIndex(ColorMethod.ByColor, 8)
ltr.ViewportVisibilityDefault = True
layerid = lt.Add(ltr)
LayerIds(0) = layerid
tr.AddNewlyCreatedDBObject(ltr, True)
End If
If Not lt.Has("PT-" + CVport.Handle.ToString()) Then
Dim ltr As LayerTableRecord = New LayerTableRecord()
ltr.Name = "PT-" + CVport.Handle.ToString()
ltr.Color = Color.FromColorIndex(ColorMethod.ByColor, 6)
ltr.ViewportVisibilityDefault = True
layerid = lt.Add(ltr)
LayerIds(1) = layerid
tr.AddNewlyCreatedDBObject(ltr, True)
End If
If Not lt.Has("PV-" + CVport.Handle.ToString()) Then
Dim ltr As LayerTableRecord = New LayerTableRecord()
ltr.Name = "PV-" + CVport.Handle.ToString()
ltr.Color = Color.FromColorIndex(ColorMethod.ByColor, 3)
ltr.ViewportVisibilityDefault = True
layerid = lt.Add(ltr)
LayerIds(2) = layerid
tr.AddNewlyCreatedDBObject(ltr, True)
End If
tr.Commit()
End Using
End Using
End Sub

Public Sub FreezeLayersInAllLayouts()
Dim doc As Document = Application.DocumentManager.MdiActiveDocument
Dim ed As Editor = doc.Editor
Dim db As Database = doc.Database
Using DocLock As DocumentLock = Application.DocumentManager.MdiActiveDocument.LockDocument()
Using tr As Transaction = db.TransactionManager.StartTransaction()
Dim layoutdict As DBDictionary = DirectCast(tr.GetObject(db.LayoutDictionaryId, OpenMode.ForRead, False, True), DBDictionary)
For Each entry As DBDictionaryEntry In layoutdict
If entry.Key <> "Model" Then
Dim lay As Layout = DirectCast(tr.GetObject(entry.Value, OpenMode.ForRead, False, True), Layout)
For Each vpid As ObjectId In lay.GetViewports()
Dim vp As Viewport = DirectCast(tr.GetObject(vpid, OpenMode.ForWrite, False, True), Viewport)
If (vp.Handle <> CVport.Handle) Then
vp.FreezeLayersInViewport(LayerIds.GetEnumerator())
End If
Next
End If
Next
tr.Commit()
End Using
End Using
End Sub

Public Sub DrawTimbers(ByVal SS As SelectionSet)
...
End Sub

End Class