Kean专题(17)—Plugin of the Month

雪山飞狐_lzh · 发表于 2010-2-3 21:42:00

一、剪贴板管理器
Clipboard Manager: October’s ADN Plugin of the Month, now live on Autodesk Labs
As Scott is leaving on a well-deserved sabbatical, he has gone ahead and posted our next Plugin of the Month a few days ahead of schedule. Here’s a link to Scott’s post announcing the tool.
This is a very cool little application developed by Mark Dubbelaar from Australia. Mark has been drafting/designing with for the last 10+ years and, during this time, has used a variety of programming languages to customize AutoCAD: LISP, VBA and now VB.NET. Mark was inspired by the “clipboard ring” functionality that used to be in Microsoft Office (at least I say “used to be” because I haven’t found it in Office 2007), and decided to implement similar functionality in AutoCAD.
The implementation of the tool is quite straightforward but the functionality is really very compelling: after having NETLOADed the tool and run the CLIPBOARD command, as you use Ctrl-C to copy drawing objects from inside AutoCAD to the clipboard a custom palette gets populated with entries containing these sets of objects. Each entry contains a time-stamp and an automatically-generated name which you can then change to something more meaningful.
When you want to use these clipboard entries, you simply right-click on one and choose the appropriate paste option (which ultimately just calls through to the standard AutoCAD paste commands, PASTECLIP, PASTEBLOCK and PASTEORIG, reducing the complexity of the tool).

ns55gn12hjb.png

That’s really all there is to it: a simple yet really useful application. Thanks for providing such a great little tool, Mark! :-)
Under the hood, the code is quite straightforward. The main file, Clipboard.vb, sets up the application to create demand-loading entries when first loaded into AutoCAD and defines a couple of commands – CLIPBOARD and REMOVECB, which removes the demand-loading entries to “uninstall” the application. It also contains the PaletteSet that contains our CbPalette and gets displayed by the CLIPBOARD command.

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Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.Windows
Imports Autodesk.AutoCAD.EditorInputPublic Class ClipBoard
  Implements IExtensionApplication   _
  Private _cp As CbPalette = Nothing  Public ReadOnly Property ClipboardPalette() As CbPalette
    Get
      If _cp Is Nothing Then
        _cp = New CbPalette
      End If
      Return _cp
    End Get
  End Property  Private _ps As PaletteSet = Nothing  Public ReadOnly Property PaletteSet() As PaletteSet
    Get
      If _ps Is Nothing Then
        _ps = New PaletteSet("Clipboard", _
          New System.Guid("ED8CDB2B-3281-4177-99BE-E1A46C3841AD"))
        _ps.Text = "Clipboard"
        _ps.DockEnabled = DockSides.Left + _
          DockSides.Right + DockSides.None
        _ps.MinimumSize = New System.Drawing.Size(200, 300)
        _ps.Size = New System.Drawing.Size(300, 500)
        _ps.Add("Clipboard", ClipboardPalette)
      End If
      Return _ps
    End Get
  End Property  Private Sub Initialize() _
    Implements IExtensionApplication.Initialize    DemandLoading.RegistryUpdate.RegisterForDemandLoading()
  End Sub  Private Sub Terminate() _
    Implements IExtensionApplication.Terminate  End Sub   _
  Public Sub ShowClipboard()    PaletteSet.Visible = True  End Sub   _
  Public Sub RemoveClipboard()    DemandLoading.RegistryUpdate.UnregisterForDemandLoading()
    Dim ed As Editor = _
      Autodesk.AutoCAD.ApplicationServices.Application _
      .DocumentManager.MdiActiveDocument.Editor()
    ed.WriteMessage(vbCr + _
      "The Clipboard Manager will not be loaded" _
      + " automatically in future editing sessions.")  End Sub
End Class

It’s the Clipboard_Palette.vb file that contains the more interesting code, implementing the behaviour of the CbPalette object. The real “magic” is how it hooks into AutoCAD’s COPYCLIP by attaching itself as the default “clipboard viewer”.

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Imports AcApp = Autodesk.AutoCAD.ApplicationServices.Application
Imports System.Windows.FormsPublic Class CbPalette  ' Constants for Windows API calls  Private Const WM_DRAWCLIPBOARD As Integer = &H308
  Private Const WM_CHANGECBCHAIN As Integer = &H30D  ' Handle for next clipboard viewer  Private _nxtCbVwrHWnd As IntPtr  ' Boolean to control access to clipboard data  Private _internalHold As Boolean = False  ' Counter for our visible clipboard name  Private _clipboardCounter As Integer = 0  ' Windows API declarations  Declare Auto Function SetClipboardViewer Lib "user32" _
    (ByVal HWnd As IntPtr) As IntPtr
  Declare Auto Function SendMessage Lib "User32" _
    (ByVal HWnd As IntPtr, ByVal Msg As Integer, _
    ByVal wParam As IntPtr, ByVal lParam As IntPtr) As Long  ' Class constructor  Public Sub New()    ' This call is required by the Windows Form Designer    InitializeComponent()    ' Register ourselves to handle clipboard modifications    _nxtCbVwrHWnd = SetClipboardViewer(Handle)  End Sub  Private Sub AddDataToGrid()    Dim currentClipboardData As DataObject = _
      My.Computer.Clipboard.GetDataObject    ' If the clipboard contents are AutoCAD-related    If IsAutoCAD(currentClipboardData.GetFormats) Then      ' Create a new row for our grid and add our clipboard
      ' data stored in the "tag"      Dim newRow As New DataGridViewRow()
      newRow.Tag = currentClipboardData      ' Increment our counter      _clipboardCounter += 1      ' Create and add a cell for the name, using our counter      Dim newNameCell As New DataGridViewTextBoxCell
      newNameCell.Value = "Clipboard " & _clipboardCounter
      newRow.Cells.Add(newNameCell)      ' Get the current time and place that in another cell      Dim newTimeCell As New DataGridViewTextBoxCell
      newTimeCell.Value = Now.ToLongTimeString
      newRow.Cells.Add(newTimeCell)      ' Add our row to the data grid and select it      clipboardDataGridView.Rows.Add(newRow)
      clipboardDataGridView.FirstDisplayedScrollingRowIndex = _
        clipboardDataGridView.Rows.Count - 1
      newRow.Selected = True    End If  End Sub  ' Move the selected item's data into the clipboard  ' Check whether the clipboard data was created by AutoCAD  Private Function IsAutoCAD(ByVal Formats As String()) As Boolean    For Each item As String In Formats
      If item.Contains("AutoCAD") Then Return True
    Next
    Return False  End Function  Private Sub PasteToClipboard()    ' Use a variable to make sure we don't edit the
    ' clipboard contents at the wrong time    _internalHold = True
    My.Computer.Clipboard.SetDataObject( _
      clipboardDataGridView.SelectedRows.Item(0).Tag)
    _internalHold = False  End Sub  ' Send a command to AutoCAD  Private Sub SendAutoCADCommand(ByVal cmd As String)    AcApp.DocumentManager.MdiActiveDocument.SendStringToExecute( _
      cmd, True, False, True)  End Sub  ' Our context-menu command handlers  Private Sub PasteToolStripButton_Click( _
    ByVal sender As Object, ByVal e As EventArgs) _
    Handles PasteToolStripMenuItem.Click    ' Swap the data from the selected item in the grid into the
    ' clipboard and use the internal AutoCAD command to paste it    If clipboardDataGridView.SelectedRows.Count = 1 Then
      PasteToClipboard()
      SendAutoCADCommand("_pasteclip ")
    End If
  End Sub  Private Sub PasteAsBlockToolStripMenuItem_Click( _
    ByVal sender As Object, ByVal e As EventArgs) _
    Handles PasteAsBlockToolStripMenuItem.Click    ' Swap the data from the selected item in the grid into the
    ' clipboard and use the internal AutoCAD command to paste it
    ' as a block    If clipboardDataGridView.SelectedRows.Count = 1 Then
      PasteToClipboard()
      SendAutoCADCommand("_pasteblock ")
    End If
  End Sub  Private Sub PasteToOriginalCoordinatesToolStripMenuItem_Click( _
    ByVal sender As Object, ByVal e As EventArgs) _
    Handles PasteToOriginalCoordinatesToolStripMenuItem.Click    ' Swap the data from the selected item in the grid into the
    ' clipboard and use the internal AutoCAD command to paste it
    ' at the original location    If clipboardDataGridView.SelectedRows.Count = 1 Then
      PasteToClipboard()
      SendAutoCADCommand("_pasteorig ")
    End If
  End Sub  Private Sub RemoveAllToolStripButton_Click( _
    ByVal sender As Object, ByVal e As EventArgs) _
    Handles RemoveAllToolStripButton.Click    ' Remove all the items in the grid    clipboardDataGridView.Rows.Clear()
  End Sub  Private Sub RenameToolStripMenuItem_Click( _
    ByVal sender As Object, ByVal e As EventArgs) _
    Handles RenameToolStripMenuItem.Click    ' Rename the selected row by editing the name cell    If clipboardDataGridView.SelectedRows.Count = 1 Then
      clipboardDataGridView.BeginEdit(True)
    End If
  End Sub  Private Sub RemoveToolStripMenuItem_Click( _
    ByVal sender As Object, ByVal e As EventArgs) _
    Handles RemoveToolStripMenuItem.Click    ' Remove the selected grid item    If clipboardDataGridView.SelectedRows.Count = 1 Then
      clipboardDataGridView.Rows.Remove( _
        clipboardDataGridView.SelectedRows.Item(0))
    End If
  End Sub  ' Our grid view event handlers  Private Sub ClipboardDataGridView_CellMouseDown( _
    ByVal sender As Object, _
    ByVal e As DataGridViewCellMouseEventArgs) _
    Handles clipboardDataGridView.CellMouseDown    ' Responding to this event allows us to make sure the
    ' correct row is properly selected on right-click    If e.Button = Windows.Forms.MouseButtons.Right Then
      clipboardDataGridView.CurrentCell = _
        clipboardDataGridView.Item(e.ColumnIndex, e.RowIndex)
    End If
  End Sub  Private Sub ClipboardDataGridView_MouseDown( _
    ByVal sender As System.Object, ByVal e As MouseEventArgs) _
    Handles clipboardDataGridView.MouseDown    ' On right-click display the row as selected and show
    ' the context menu at the location of the cursor    If e.Button = Windows.Forms.MouseButtons.Right Then
      Dim hti As DataGridView.HitTestInfo = _
        clipboardDataGridView.HitTest(e.X, e.Y)
      If hti.Type = DataGridViewHitTestType.Cell Then        clipboardDataGridView.ClearSelection()
        clipboardDataGridView.Rows(hti.RowIndex).Selected = True        ContextMenuStrip.Show(clipboardDataGridView, e.Location)
      End If
    End If  End Sub  ' Override WndProc to get messages  Protected Overrides Sub WndProc(ByRef m As Message)
    Select Case m.Msg  ' The clipboard has changed  Case Is = WM_DRAWCLIPBOARD    If Not _internalHold Then AddDataToGrid()    SendMessage(_nxtCbVwrHWnd, m.Msg, m.WParam, m.LParam)    ' Another clipboard viewer has removed itself  Case Is = WM_CHANGECBCHAIN    If m.WParam = CType(_nxtCbVwrHWnd, IntPtr) Then
      _nxtCbVwrHWnd = m.LParam
    Else
      SendMessage(_nxtCbVwrHWnd, m.Msg, m.WParam, m.LParam)
    End If    End Select    MyBase.WndProc(m)
  End SubEnd ClassPublic Class PaletteToolStrip  Inherits ToolStrip  Public Sub New()
    MyBase.New()
  End Sub  Public Sub New(ByVal ParamArray Items() As ToolStripItem)
    MyBase.New(Items)
  End Sub  Protected Overrides Sub WndProc(ByRef m As Message)
    If m.Msg = &H21 AndAlso CanFocus AndAlso Not Focused Then
      Focus()
    End If
    MyBase.WndProc(m)
  End SubEnd Class

I also added a VB.NET version of the C# code that automatically registers an AutoCAD .NET application for demand-loading based on the commands it defines:

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Imports System.Collections.Generic
Imports System.Reflection
Imports System.Resources
Imports System
Imports Microsoft.Win32
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.AutoCAD.RuntimeNamespace DemandLoading
  Public Class RegistryUpdate
    Public Shared Sub RegisterForDemandLoading()
  ' Get the assembly, its name and location  Dim assem As Assembly = Assembly.GetExecutingAssembly()
  Dim name As String = assem.GetName().Name
  Dim path As String = assem.Location  ' We'll collect information on the commands
  ' (we could have used a map or a more complex
  ' container for the global and localized names
  ' - the assumption is we will have an equal
  ' number of each with possibly fewer groups)  Dim globCmds As New List(Of String)()
  Dim locCmds As New List(Of String)()
  Dim groups As New List(Of String)()  ' Iterate through the modules in the assembly  Dim mods As [Module]() = assem.GetModules(True)
  For Each [mod] As [Module] In mods
    ' Within each module, iterate through the types    Dim types As Type() = [mod].GetTypes()
    For Each type As Type In types
      ' We may need to get a type's resources      Dim rm As New ResourceManager(type.FullName, assem)
      rm.IgnoreCase = True      ' Get each method on a type      Dim meths As MethodInfo() = type.GetMethods()
      For Each meth As MethodInfo In meths
        ' Get the methods custom command attribute(s)        Dim attbs As Object() = _
          meth.GetCustomAttributes( _
        GetType(CommandMethodAttribute), True)
        For Each attb As Object In attbs
          Dim cma As CommandMethodAttribute = _
            TryCast(attb, CommandMethodAttribute)
          If cma IsNot Nothing Then
            ' And we can finally harvest the information
            ' about each command            Dim globName As String = cma.GlobalName
            Dim locName As String = globName
            Dim lid As String = cma.LocalizedNameId            ' If we have a localized command ID,
            ' let's look it up in our resources            If lid IsNot Nothing Then
              ' Let's put a try-catch block around this
              ' Failure just means we use the global
              ' name twice (the default)              Try
                locName = rm.GetString(lid)
              Catch
              End Try
            End If            ' Add the information to our data structures            globCmds.Add(globName)
            locCmds.Add(locName)            If cma.GroupName IsNot Nothing AndAlso _
              Not groups.Contains(cma.GroupName) Then
              groups.Add(cma.GroupName)
            End If
          End If
        Next
      Next
    Next
  Next  ' Let's register the application to load on demand (12)
  ' if it contains commands, otherwise we will have it
  ' load on AutoCAD startup (2)  Dim flags As Integer = (If(globCmds.Count > 0, 12, 2))  ' By default let's create the commands in HKCU
  ' (pass false if we want to create in HKLM)  CreateDemandLoadingEntries(name, path, globCmds, locCmds, _
    groups, flags, True)
    End Sub    Public Shared Sub UnregisterForDemandLoading()
      RemoveDemandLoadingEntries(True)
    End Sub    ' Helper functions    Private Shared Sub CreateDemandLoadingEntries( _
      ByVal name As String, ByVal path As String, _
      ByVal globCmds As List(Of String), _
      ByVal locCmds As List(Of String), _
      ByVal groups As List(Of String), _
      ByVal flags As Integer, _
      ByVal currentUser As Boolean)      ' Choose a Registry hive based on the function input      Dim hive As RegistryKey = _
        If(currentUser,Registry.CurrentUser,Registry.LocalMachine)      ' Open the main AutoCAD (or vertical) and "Applications" keys      Dim ack As RegistryKey = _
        hive.OpenSubKey( _
          HostApplicationServices.Current.RegistryProductRootKey)
      Dim appk As RegistryKey = ack.OpenSubKey("Applications", True)      ' Already registered? Just return      Dim subKeys As String() = appk.GetSubKeyNames()
      For Each subKey As String In subKeys
        If subKey.Equals(name) Then
          appk.Close()
          Exit Sub
        End If
      Next      ' Create the our application's root key and its values      Dim rk As RegistryKey = appk.CreateSubKey(name)
      rk.SetValue("DESCRIPTION", name, RegistryValueKind.[String])
      rk.SetValue("LOADCTRLS", flags, RegistryValueKind.DWord)
      rk.SetValue("LOADER", path, RegistryValueKind.[String])
      rk.SetValue("MANAGED", 1, RegistryValueKind.DWord)      ' Create a subkey if there are any commands...      If (globCmds.Count = locCmds.Count) _
        AndAlso globCmds.Count > 0 Then
        Dim ck As RegistryKey = rk.CreateSubKey("Commands")        For i As Integer = 0 To globCmds.Count - 1
          ck.SetValue(globCmds(i), locCmds(i), _
            RegistryValueKind.[String])
        Next
      End If      ' And the command groups, if there are any      If groups.Count > 0 Then
        Dim gk As RegistryKey = rk.CreateSubKey("Groups")        For Each grpName As String In groups
          gk.SetValue(grpName, grpName, _
            RegistryValueKind.[String])
        Next
      End If      appk.Close()
    End Sub    Private Shared Sub RemoveDemandLoadingEntries( _
      ByVal currentUser As Boolean)      Try        ' Choose a Registry hive based on the function input        Dim hive As RegistryKey = _
          If(currentUser,Registry.CurrentUser,Registry.LocalMachine)        ' Open the main AutoCAD (or vertical) and "Applications" keys        Dim ack As RegistryKey = _
          hive.OpenSubKey( _
            HostApplicationServices.Current.RegistryProductRootKey)
        Dim appk As RegistryKey = _
          ack.OpenSubKey("Applications", True)        ' Delete the key with the same name as this assembly        appk.DeleteSubKeyTree( _
          Assembly.GetExecutingAssembly().GetName().Name)
        appk.Close()      Catch
      End Try
    End Sub
  End Class
End Namespace

That’s really all there is to it. If you have any feedback regarding the behaviour of the tool, please do send us an email.

雪山飞狐_lzh · 发表于 2010-2-3 22:30:00

二、加强版本的截图
http://through-the-interface.typepad.com/through_the_interface/2009/11/novembers-plugin-of-the-month-screenshot.html
November 16, 2009
Updated version of Screenshot now available
We’ve had a few reports of issues with the Screenshot “Plugin of the Month”. They fall into two main categories:
Attempting to NETLOAD the application DLL from a network share
Within the ReadMe for each of the plugins we’ve documented that each application’s DLL module should be copied to the local file system – preferably inside the AutoCAD Program Files folder – before being loaded by NETLOAD. We recommend this because it essentially stops users from hitting a whole category of .NET Framework-related problems when loading and running the plugins.
If you didn’t heed this advice then you’d probably find that, as soon as the SCREENSHOT command was launched, you received a message such as “FATAL ERROR: Unsupported version of Windows Presentation Foundation.”
Now I don’t have an exhaustive list of reasons it’s best to place .NET DLLs in the AutoCAD root program folder, but my understanding/belief is that it’s down to two main ones:
1. Security
The .NET Framework implements security for different zones, and – up until the .NET Framework 3.5 SP1 – the default security setting for the “Local Intranet” (which affects applications being loaded from network shares) was “Medium Trust”. This level of trust means:
Programs might not be able to access most protected resources such as the registry or security policy settings, or access your local file system without user interaction. Programs will not be able to connect back to their site of origin, resolve domain names, and use all windowing resources.
Our “Plugin of the Month” applications target lower versions of the .NET Framework (we want to avoid forcing people to use the latest version of the framework and want the applications to run – where possible – at least as far back as AutoCAD 2007), and so their default level of trust will make running from a network share a problem.
Now it’s possible to use the Control Panel to configure earlier versions of the .NET Framework to be more tolerant of network-resident DLLs (you can change the trust level for the local intranet zone to be higher), but it’s still not something I’d recommend: I’m pretty sure this is only one aspect of the situation, and it would be dangerous to assume it’s all that’s needed.
2. Assembly Loading
The other main reason for putting modules in AutoCAD’s root program folder is related to the loading of .NET assemblies into AutoCAD’s AppDomain (which is basically what the NETLOAD command does, and this choice of architecture is why there’s no NETUNLOAD command).
While NETLOAD uses Assembly.LoadFrom() to load in .NET assembly DLLs – which does allow you to specify a path other than the current folder – there does appear to be some fragility overall with the location of assemblies and how they reference each other. It’s safest to place assemblies at a location beneath the calling executable (i.e. AutoCAD).
Capturing images with the “force foreground to black” option results in a completely black image
This one is definitely down to me. A big thank you to Harry Kortekaas for very diligently helping me identify the problem.
It actually came down to some poor application logic on my side: I was forgetting to check the “use white background” flag at the right place, and had also inverted the test for being in modelspace vs. paperspace. By chance – in many situations – the white background was picked up correctly from the paperspace, and so the issue wasn’t easily reproducible.
Anyway, a fix has now been integrated into version 1.0.2 of the application, which is now downloadable via Autodesk Labs. I’ve also included an updated version of the code below.

A third type of issue has been reported, but I haven’t yet been able to determine the cause: on one system (meaning: one reported, so far) the file selection dialog and the dynamic input graphics are not being refreshed away in time for the capture to take place.
This is similar to something we’ve been aware of from early on - the fact that the call to Editor.GetFileNameForSave() returns control to the application before the Operating System has had the chance to refresh the screen – so I built a delay (a call to System.Threading.Thread.Sleep()) into the original application to wait for a second (we started at 0.1s and worked our way upwards) which seemed to address it for all the systems upon which the application was tested.
At first it seemed – during the diagnosis of this particular issue – that this delay needed increasing, and so I added it to the per-user application settings (with the default value of 1.0, i.e. a second). This is now configurable via a new command – CONFIGSS – the logic being to keep rarely-used configuration options apart from the common ones accessible via the SCREENSHOT command. In this particular situation, though, no amount of delay seemed to help.
The same person reported an issue with the input box and temporary dimensions displayed during dynamic input not being repainted away on this particular system when the image is placed on the clipboard, so I’ve also introduced a configurable delay there, too. This is also set using CONFIGSS – the default is currently 0 seconds, to replicate the previous behaviour.
I suspect that both issues are actually down to a configuration problem (we’ll hopefully see whether my suspicion is valid), but I’ve left the capability to configure them in the application, in any case. People may also choose to reduce the current delay using CONFIGSS, as one second was on the high end: 0.3 seconds should be enough for the majority of systems. Just think of all the time you can get back! :-)
If anyone else out there has seen something similar to this with the Screenshot application, please do let us know.
The CONFIGSS command has a third setting exposed (although it’s the first one it prompts for), and this was also introduced after receiving feedback from the same source: it’s sometimes preferred to have a boundary zone or buffer around the extents chosen via the “Objects” option, so that the selection isn’t so tight-fitting around the objects. The application now has a default of 10% of the screen extents’ width or height (whichever is larger) that will get added automatically. To go back to the old behaviour you can configure this percentage to zero using CONFIGSS.
Here’s the updated C# code: the compiled version of which (again, version 1.0.2) is now available:

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// (C) Copyright 2009 by Autodesk, Inc. 
//
// Permission to use, copy, modify, and distribute this software in
// object code form for any purpose and without fee is hereby granted, 
// provided that the above copyright notice appears in all copies and 
// that both that copyright notice and the limited warranty and
// restricted rights notice below appear in all supporting 
// documentation.
//
// AUTODESK PROVIDES THIS PROGRAM "AS IS" AND WITH ALL FAULTS. 
// AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
// MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE.  AUTODESK, INC. 
// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
// UNINTERRUPTED OR ERROR FREE.
//
// Use, duplication, or disclosure by the U.S. Government is subject to 
// restrictions set forth in FAR 52.227-19 (Commercial Computer
// Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
// (Rights in Technical Data and Computer Software), as applicable.
//
 
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.GraphicsInterface;
using Autodesk.AutoCAD.GraphicsSystem;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.Colors;
 
using System.Drawing.Imaging;
using System.Drawing.Printing;
using System.Drawing.Drawing2D;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Collections;
using System.Configuration;
using System;
 
using DemandLoading;
 
namespace Screenshot
{
  public class ScreenshotApplication : IExtensionApplication
  {
    // Define a class for our custom data
 
    public class AppData : ApplicationSettingsBase
    {
      [UserScopedSetting()]
      [DefaultSettingValue("true")]
      public bool Clipboard
      {
        get { return ((bool)this["Clipboard"]); }
        set { this["Clipboard"] = (bool)value; }
      }
      [UserScopedSetting()]
      [DefaultSettingValue("false")]
      public bool Print
      {
        get { return ((bool)this["Print"]); }
        set { this["Print"] = (bool)value; }
      }
      [UserScopedSetting()]
      [DefaultSettingValue("false")]
      public bool WhiteBackground
      {
        get { return ((bool)this["WhiteBackground"]); }
        set { this["WhiteBackground"] = (bool)value; }
      }
      [UserScopedSetting()]
      [DefaultSettingValue("false")]
      public bool BlackForeground
      {
        get { return ((bool)this["BlackForeground"]); }
        set { this["BlackForeground"] = (bool)value; }
      }
      [UserScopedSetting()]
      [DefaultSettingValue("false")]
      public bool Grayscale
      {
        get { return ((bool)this["Grayscale"]); }
        set { this["Grayscale"] = (bool)value; }
      }
      [UserScopedSetting()]
      [DefaultSettingValue("0.1")]
      public double ExtentsScale
      {
        get { return ((double)this["ExtentsScale"]); }
        set { this["ExtentsScale"] = (double)value; }
      }
      [UserScopedSetting()]
      [DefaultSettingValue("1.0")]
      public double FileCaptureDelay
      {
        get { return ((double)this["FileCaptureDelay"]); }
        set { this["FileCaptureDelay"] = (double)value; }
      }
      [UserScopedSetting()]
      [DefaultSettingValue("0.0")]
      public double ClipboardCaptureDelay
      {
        get { return ((double)this["ClipboardCaptureDelay"]); }
        set { this["ClipboardCaptureDelay"] = (double)value; }
      }
    }
 
    // A struct for communicating colours to/from AutoCAD
 
    public struct AcColorSettings
    {
      public UInt32 dwGfxModelBkColor;
      public UInt32 dwGfxLayoutBkColor;
      public UInt32 dwParallelBkColor;
      public UInt32 dwBEditBkColor;
      public UInt32 dwCmdLineBkColor;
      public UInt32 dwPlotPrevBkColor;
      public UInt32 dwSkyGradientZenithColor;
      public UInt32 dwSkyGradientHorizonColor;
      public UInt32 dwGroundGradientOriginColor;
      public UInt32 dwGroundGradientHorizonColor;
      public UInt32 dwEarthGradientAzimuthColor;
      public UInt32 dwEarthGradientHorizonColor;
      public UInt32 dwModelCrossHairColor;
      public UInt32 dwLayoutCrossHairColor;
      public UInt32 dwParallelCrossHairColor;
      public UInt32 dwPerspectiveCrossHairColor;
      public UInt32 dwBEditCrossHairColor;
      public UInt32 dwParallelGridMajorLines;
      public UInt32 dwPerspectiveGridMajorLines;
      public UInt32 dwParallelGridMinorLines;
      public UInt32 dwPerspectiveGridMinorLines;
      public UInt32 dwParallelGridAxisLines;
      public UInt32 dwPerspectiveGridAxisLines;
      public UInt32 dwTextForeColor;
      public UInt32 dwTextBkColor;
      public UInt32 dwCmdLineForeColor;
      public UInt32 dwAutoTrackingVecColor;
      public UInt32 dwLayoutATrackVecColor;
      public UInt32 dwParallelATrackVecColor;
      public UInt32 dwPerspectiveATrackVecColor;
      public UInt32 dwBEditATrackVecColor;
      public UInt32 dwModelASnapMarkerColor;
      public UInt32 dwLayoutASnapMarkerColor;
      public UInt32 dwParallelASnapMarkerColor;
      public UInt32 dwPerspectiveASnapMarkerColor;
      public UInt32 dwBEditASnapMarkerColor;
      public UInt32 dwModelDftingTooltipColor;
      public UInt32 dwLayoutDftingTooltipColor;
      public UInt32 dwParallelDftingTooltipColor;
      public UInt32 dwPerspectiveDftingTooltipColor;
      public UInt32 dwBEditDftingTooltipColor;
      public UInt32 dwModelDftingTooltipBkColor;
      public UInt32 dwLayoutDftingTooltipBkColor;
      public UInt32 dwParallelDftingTooltipBkColor;
      public UInt32 dwPerspectiveDftingTooltipBkColor;
      public UInt32 dwBEditDftingTooltipBkColor;
      public UInt32 dwModelLightGlyphs;
      public UInt32 dwLayoutLightGlyphs;
      public UInt32 dwParallelLightGlyphs;
      public UInt32 dwPerspectiveLightGlyphs;
      public UInt32 dwBEditLightGlyphs;
      public UInt32 dwModelLightHotspot;
      public UInt32 dwLayoutLightHotspot;
      public UInt32 dwParallelLightHotspot;
      public UInt32 dwPerspectiveLightHotspot;
      public UInt32 dwBEditLightHotspot;
      public UInt32 dwModelLightFalloff;
      public UInt32 dwLayoutLightFalloff;
      public UInt32 dwParallelLightFalloff;
      public UInt32 dwPerspectiveLightFalloff;
      public UInt32 dwBEditLightFalloff;
      public UInt32 dwModelLightStartLimit;
      public UInt32 dwLayoutLightStartLimit;
      public UInt32 dwParallelLightStartLimit;
      public UInt32 dwPerspectiveLightStartLimit;
      public UInt32 dwBEditLightStartLimit;
      public UInt32 dwModelLightEndLimit;
      public UInt32 dwLayoutLightEndLimit;
      public UInt32 dwParallelLightEndLimit;
      public UInt32 dwPerspectiveLightEndLimit;
      public UInt32 dwBEditLightEndLimit;
      public UInt32 dwModelCameraGlyphs;
      public UInt32 dwLayoutCameraGlyphs;
      public UInt32 dwParallelCameraGlyphs;
      public UInt32 dwPerspectiveCameraGlyphs;
      public UInt32 dwModelCameraFrustrum;
      public UInt32 dwLayoutCameraFrustrum;
      public UInt32 dwParallelCameraFrustrum;
      public UInt32 dwPerspectiveCameraFrustrum;
      public UInt32 dwModelCameraClipping;
      public UInt32 dwLayoutCameraClipping;
      public UInt32 dwParallelCameraClipping;
      public UInt32 dwPerspectiveCameraClipping;
      public int nModelCrosshairUseTintXYZ;
      public int nLayoutCrosshairUseTintXYZ;
      public int nParallelCrosshairUseTintXYZ;
      public int nPerspectiveCrosshairUseTintXYZ;
      public int nBEditCrossHairUseTintXYZ;
      public int nModelATrackVecUseTintXYZ;
      public int nLayoutATrackVecUseTintXYZ;
      public int nParallelATrackVecUseTintXYZ;
      public int nPerspectiveATrackVecUseTintXYZ;
      public int nBEditATrackVecUseTintXYZ;
      public int nModelDftingTooltipBkUseTintXYZ;
      public int nLayoutDftingTooltipBkUseTintXYZ;
      public int nParallelDftingTooltipBkUseTintXYZ;
      public int nPerspectiveDftingTooltipBkUseTintXYZ;
      public int nBEditDftingTooltipBkUseTintXYZ;
      public int nParallelGridMajorLineTintXYZ;
      public int nPerspectiveGridMajorLineTintXYZ;
      public int nParallelGridMinorLineTintXYZ;
      public int nPerspectiveGridMinorLineTintXYZ;
      public int nParallelGridAxisLineTintXYZ;
      public int nPerspectiveGridAxisLineTintXYZ;
    };
 
    // For the coordinate tranformation we need...  
 
    // A Win32 function:
 
    [DllImport("user32.dll")]
    static extern bool ClientToScreen(IntPtr hWnd, ref Point pt);
 
    // And to access the colours in AutoCAD, we need ObjectARX...
 
    [DllImport("acad.exe",
    CallingConvention = CallingConvention.Cdecl,
    EntryPoint = "?acedGetCurrentColors@@YAHPAUAcColorSettings@@@Z"
    )]
    static extern bool acedGetCurrentColors32(
      out AcColorSettings colorSettings
    );
 
    [DllImport("acad.exe",
    CallingConvention = CallingConvention.Cdecl,
    EntryPoint = "?acedSetCurrentColors@@YAHPAUAcColorSettings@@@Z"
    )]
    static extern bool acedSetCurrentColors32(
      ref AcColorSettings colorSettings
    );
 
    // 64-bit versions of these functions...
 
    [DllImport("acad.exe",
    CallingConvention = CallingConvention.Cdecl,
    EntryPoint = "?acedGetCurrentColors@@YAHPEAUAcColorSettings@@@Z"
    )]
    static extern bool acedGetCurrentColors64(
      out AcColorSettings colorSettings
    );
 
    [DllImport("acad.exe",
    CallingConvention = CallingConvention.Cdecl,
    EntryPoint = "?acedSetCurrentColors@@YAHPEAUAcColorSettings@@@Z"
    )]
    static extern bool acedSetCurrentColors64(
      ref AcColorSettings colorSettings
    );
 
    // Helper functions that call automatically to 32- or 64-bit
    // versions, as appropriate
 
    static bool acedGetCurrentColors(
      out AcColorSettings colorSettings
    )
    {
      if (IntPtr.Size > 4)
        return acedGetCurrentColors64(out colorSettings);
      else
        return acedGetCurrentColors32(out colorSettings);
    }
 
    static bool acedSetCurrentColors(
      ref AcColorSettings colorSettings
    )
    {
      if (IntPtr.Size > 4)
        return acedSetCurrentColors64(ref colorSettings);
      else
        return acedSetCurrentColors32(ref colorSettings);
    }
 
    // IExtensionApplication protocol
 
    public void Initialize()
    {
      try
      {
        RegistryUpdate.RegisterForDemandLoading();
      }
      catch
      { }
    }
 
    public void Terminate()
    {
    }
 
    [CommandMethod("ADNPLUGINS", "REMOVESS", CommandFlags.Modal)]
    static public void RemoveScreenshot()
    {
      RegistryUpdate.UnregisterForDemandLoading();
    }
 
    [CommandMethod("ADNPLUGINS", "CONFIGSS", CommandFlags.Modal)]
    static public void ConfigureScreenshot()
    {
      // An additional command for some "advanced" configuration
      // options
 
      Document doc =
        Application.DocumentManager.MdiActiveDocument;
      Editor ed = doc.Editor;
 
      // Retrieve our application settings (or create new ones)
 
      AppData ad = new AppData();
      ad.Reload();
 
      if (ad != null)
      {
        // Ask the user for the percentage increase to apply to
        // the extents determined by the Objects option
 
        PromptIntegerOptions pio =
          new PromptIntegerOptions(
            "\nPercentage increase when capturing " +
            "object extents: "
          );
        pio.DefaultValue = (int)(ad.ExtentsScale * 100);
        pio.LowerLimit = 0;
        pio.UpperLimit = 100;
        pio.UseDefaultValue = true;
 
        PromptIntegerResult pir = ed.GetInteger(pio);
        if (pir.Status != PromptStatus.OK)
          return;
 
        ad.ExtentsScale = pir.Value * 0.01;
 
        // Ask the use for the delay to apply after a file
        // has been selected, to allow the OS to redraw their
        // screen graphics
 
        PromptDoubleOptions pdo =
          new PromptDoubleOptions(
            "\nDelay in seconds to allow " +
            "repaint after file selection: "
          );
        pdo.DefaultValue = ad.FileCaptureDelay;
        pdo.AllowNegative = false;
        pdo.UseDefaultValue = true;
 
        PromptDoubleResult pdr = ed.GetDouble(pdo);
        if (pdr.Status != PromptStatus.OK)
          return;
 
        ad.FileCaptureDelay = pdr.Value;
 
        // Ask the user for the delay to apply before a
        // clipboard capture to allow any dynamic
        // input graphics to be undrawn
 
        pdo.Message =
          "\nDelay in seconds to allow " +
          "repaint before clipboard selection: ";
        pdo.DefaultValue = ad.ClipboardCaptureDelay;
 
        pdr = ed.GetDouble(pdo);
        if (pdr.Status != PromptStatus.OK)
          return;
 
        ad.ClipboardCaptureDelay = pdr.Value;
 
        ad.Save();
      }
    }
 
    // Command to capture the main and active drawing windows
    // or a user-selected portion of a drawing
 
    [CommandMethod("ADNPLUGINS", "SCREENSHOT", CommandFlags.Modal)]
    static public void CaptureScreenShot()
    {
      Document doc =
        Application.DocumentManager.MdiActiveDocument;
      Editor ed = doc.Editor;
 
      // Retrieve our application settings (or create new ones)
 
      AppData ad = new AppData();
      ad.Reload();
 
      if (ad != null)
      {
        string filename = "";
        bool settingschosen;
        PromptPointResult ppr;
 
        do
        {
          settingschosen = false;
 
          // Ask the user for the screen window to capture
 
          PrintSettings(ed, ad);
          PromptPointOptions ppo =
            new PromptPointOptions(
              "\nSelect first point of capture window or " +
              "[Document/Application/Objects/Settings]: ",
              "Document Application Objects Settings"
            );
 
          // Get the first point of the capture window,
          // or a keyword
 
          ppr = ed.GetPoint(ppo);
 
          if (ppr.Status == PromptStatus.Keyword)
          {
            if (ppr.StringResult == "Document")
            {
              // Capture the active document window
 
              filename = PauseOrFilename(ed, ad);
 
              ScreenShotToFile(
                Application.DocumentManager.
                  MdiActiveDocument.Window,
                30, 26, 10, 10,
                filename,
                ad
              );
            }
            else if (ppr.StringResult == "Application")
            {
              // Capture the entire application window
 
              filename = PauseOrFilename(ed, ad);
 
              ScreenShotToFile(
                Application.MainWindow,
                0, 0, 0, 0,
                filename,
                ad
              );
            }
            else if (ppr.StringResult == "Objects")
            {
              // Ask the user to select a number of entities
 
              PromptSelectionResult psr =
                ed.GetSelection();
 
              if (psr.Status == PromptStatus.OK)
              {
                // Regenerate to clear any selection highlighting
 
                ed.WriteMessage("\n");
                ed.Regen();
 
                // Generate screen coordinate points based on the
                // drawing points selected
 
                // First we get the viewport number
 
                short vp =
                  (short)Application.GetSystemVariable("CVPORT");
 
                // Then the handle to the current drawing window
 
                IntPtr hWnd = doc.Window.Handle;
 
                // Get the screen extents of the selected entities
 
                Point pt1, pt2;
                GetExtentsOfSelection(
                  ed, doc, hWnd, vp, psr.Value, out pt1, out pt2
                );
 
                ApplyScaleToExtents(ad.ExtentsScale,ref pt1,ref pt2);
 
                // Now save this portion of our screen as a raster
                // image
 
                filename = PauseOrFilename(ed, ad);
 
                ScreenShotToFile(pt1, pt2, filename, ad);
              }
            }
            else if (ppr.StringResult == "Settings")
            {
              if (GetSettings(ed, ad))
                ad.Save();
              settingschosen = true;
            }
          }
        }
        while (settingschosen); // Loop if settings were modified
 
        if (ppr.Status == PromptStatus.OK)
        {
          // Now we're ready to select the second point
 
          Point3d first = ppr.Value;
 
          ppr =
            ed.GetCorner(
              "\nSelect second point of capture window: ",
              first
            );
          if (ppr.Status != PromptStatus.OK)
            return;
 
          Point3d second = ppr.Value;
 
          // Generate screen coordinate points based on the
          // drawing points selected
 
          Point pt1, pt2;
 
          // First we get the viewport number
 
          short vp =
            (short)Application.GetSystemVariable("CVPORT");
 
          // Then the handle to the current drawing window
 
          IntPtr hWnd = doc.Window.Handle;
 
          // Now calculate the selected corners in screen coordinates
 
          pt1 = ScreenFromDrawingPoint(ed, hWnd, first, vp, true);
          pt2 = ScreenFromDrawingPoint(ed, hWnd, second, vp, true);
 
          // Now save this portion of our screen as a raster image
 
          filename = PauseOrFilename(ed, ad);
 
          ScreenShotToFile(pt1, pt2, filename, ad);
        }
      }
    }
 
    // If using the clipboard let's introduce a pause to allow
    // any dynamic input graphics to be refreshed away.
    // Otherwise get the filename (which will have its own delay)
 
    private static string PauseOrFilename(Editor ed, AppData ad)
    {
      if (ad.Clipboard)
      {
        ed.UpdateScreen();
        System.Threading.Thread.Sleep(
          (int)(1000 * ad.ClipboardCaptureDelay)
        );
        return "";
      }
      else
        return GetFileName(ed, ad);
    }
 
    // Iterate through a selection-set and get the overall extents
    // of the various objects relative to the screen
    // (this is imperfect: our extents in WCS may not translate to
    // the extents on the screen. A more thorough approach would be
    // to get a number of points from an object and check each)
 
    private static void GetExtentsOfSelection(
      Editor ed,
      Document doc,
      IntPtr hWnd,
      short vp,
      SelectionSet ss,
      out Point min,
      out Point max
    )
    {
      // Create minimum and maximum points for the "on screen"
      // extents of our objects
 
      min = new Point();
      max = new Point();
 
      // Know which is the first pass through
 
      bool first = true;
 
      // Some variables to store transformation results
 
      Point pt1 = new Point(), pt2 = new Point();
 
      Transaction tr =
        doc.TransactionManager.StartTransaction();
      using (tr)
      {
        foreach (SelectedObject so in ss)
        {
          DBObject obj =
            tr.GetObject(so.ObjectId, OpenMode.ForRead);
          Entity ent = obj as Entity;
          if (ent != null)
          {
            // Get the WCS extents of each object
 
            Extents3d ext = ent.GeometricExtents;
 
            // Calculate the extent corners in screen coordinates
            // (this may not be the true screen extents, but we'll
            // hope it's good enough)
 
            pt1 =
              ScreenFromDrawingPoint(
                ed, hWnd, ext.MinPoint, vp, false
              );
            pt2 =
              ScreenFromDrawingPoint(
                ed, hWnd, ext.MaxPoint, vp, false
              );
 
            // The points may not be ordered, so get the min and max
            // values for both X and Y from both points
 
            int minX = Math.Min(pt1.X, pt2.X);
            int minY = Math.Min(pt1.Y, pt2.Y);
            int maxX = Math.Max(pt1.X, pt2.X);
            int maxY = Math.Max(pt1.Y, pt2.Y);
 
            // On the first run through, just get the points
 
            if (first)
            {
              min = new Point(minX, minY);
              max = new Point(maxX, maxY);
              first = false;
            }
            else
            {
              // On subsequent runs through, we need to compare
 
              if (minX  max.X) max.X = maxX;
              if (maxY > max.Y) max.Y = maxY;
            }
          }
        }
        tr.Commit();
      }
    }
 
    // Apply a scale to the supplied extents
    // (provided as a potion of the extents, i.e. 10% == 0.1)
 
    private static void ApplyScaleToExtents(
      double factor,
      ref Point pt1,
      ref Point pt2
    )
    {
      // Get the width and height of the selected screen area
 
      int width = Math.Abs(pt2.X - pt1.X);
      int height = Math.Abs(pt2.Y - pt1.Y);
 
      // Decide what the (uniform) border should be: use
      // a portion of either the width or the height,
      // whichever's larger
 
      int border =
        (int)(factor * (width > height ? width : height));
 
      // Adjust the two screen points by this border amount
 
      if (pt1.X  e.MarginBounds.Height)
                    {
                      // Change the height to fit the paper
 
                      hgt = e.MarginBounds.Height;
 
                      // Adjust the width to maintain scale
 
                      wid = (int)(ratio * hgt);
                    }
 
                    // Set the interpolation settings to high
                    // quality
 
                    e.Graphics.InterpolationMode =
                      InterpolationMode.HighQualityBicubic;
 
                    // And send the image out to the page
 
                    e.Graphics.DrawImage(
                      toPrint,
                      e.MarginBounds.X,
                      e.MarginBounds.Y,
                      wid,
                      hgt
                    );
                  };
 
                // Create and show the print dialog
 
                System.Windows.Forms.PrintDialog pdlg =
                  new System.Windows.Forms.PrintDialog();
                pdlg.Document = pdoc;
 
                if (pdlg.ShowDialog() ==
                    System.Windows.Forms.DialogResult.OK)
                  pdoc.Print(); // Print on OK
              }
            }
          }
        }
        if (ad.WhiteBackground)
        {
          if (vtrId != ObjectId.Null || sbId != ObjectId.Null)
          {
            Remove3DBackground(db, tr, vtrId, sbId);
          }
          else
          {
            if (gotSettings)
            {
              acedSetCurrentColors(ref ocs);
              ed.WriteMessage("\n");
              ed.Regen();
            }
          }
          ed.UpdateScreen();
        }
        tr.Commit();
      }
    }
 
    // Check whether the active viewport is 3D
 
    private static bool is3D(Manager gsm)
    {
      short vp =
        (short)Application.GetSystemVariable("CVPORT");
      View v = gsm.GetGsView(vp, false);
      using (v)
      {
        return (v != null);
      }
    }
 
    // Return the image format to use for a particular filename
 
    private static ImageFormat GetFormatForFile(string filename)
    {
      // If all else fails, let's create a PNG
      // (might also choose to throw an exception)
 
      ImageFormat imf = ImageFormat.Png;
      if (filename.Contains("."))
      {
        // Get the filename's extension (what follows the last ".")
 
        string ext =
          filename.Substring(filename.LastIndexOf(".") + 1);
 
        // Get the first three characters of the extension
 
        if (ext.Length > 3)
          ext = ext.Substring(0, 3);
 
        // Choose the format based on the extension (in lowercase)
 
        switch (ext.ToLower())
        {
          case "bmp":
            imf = ImageFormat.Bmp;
            break;
          case "gif":
            imf = ImageFormat.Gif;
            break;
          case "jpg":
            imf = ImageFormat.Jpeg;
            break;
          case "tif":
            imf = ImageFormat.Tiff;
            break;
          case "wmf":
            imf = ImageFormat.Wmf;
            break;
          default:
            imf = ImageFormat.Png;
            break;
        }
      }
      return imf;
    }
 
    // Set the background colour of a 3D view
 
    private static void Set3DBackground(
      Editor ed,
      Database db,
      Transaction tr,
      EntityColor ec,
      out ObjectId vtrId,
      out ObjectId sbId
    )
    {
      // We're be returning IDs of the Viewport Table Record
      // and of the background itself
 
      vtrId = ObjectId.Null;
      sbId = ObjectId.Null;
 
      ed.UpdateTiledViewportsInDatabase();
      ViewportTable vt =
        (ViewportTable)tr.GetObject(
          db.ViewportTableId,
          OpenMode.ForRead
        );
 
      if (vt.Has("*Active"))
      {
        // Let's get the Viewport Table Record
 
        vtrId = vt["*Active"];
        DBDictionary nod =
          (DBDictionary)tr.GetObject(
            db.NamedObjectsDictionaryId,
            OpenMode.ForRead
          );
 
        // And create the background dictionary, if none exists
 
        ObjectId bkdId = ObjectId.Null;
        DBDictionary bkDict = null;
 
        const string dictKey = "ACAD_BACKGROUND";
        const string bkKey = "ADNPlugin_Screenshot";
 
        if (nod.Contains(dictKey))
        {
          bkdId = nod.GetAt(dictKey);
          bkDict =
            (DBDictionary)tr.GetObject(bkdId, OpenMode.ForWrite);
        }
        else
        {
          bkDict = new DBDictionary();
          nod.UpgradeOpen();
          bkdId = nod.SetAt(dictKey, bkDict);
          tr.AddNewlyCreatedDBObject(bkDict, true);
        }
 
        // Get or create our background object
 
        if (bkDict.Contains(bkKey))
        {
          sbId = bkDict.GetAt(bkKey);
        }
        else
        {
          SolidBackground sb = new SolidBackground();
          sb.Color = ec;
 
          sbId = bkDict.SetAt(bkKey, sb);
          tr.AddNewlyCreatedDBObject(sb, true);
        }
 
        // And set it to the viewport
 
        ViewportTableRecord vtr =
          (ViewportTableRecord)tr.GetObject(
            vtrId,
            OpenMode.ForWrite
          );
        vtr.Background = sbId;
      }
    }
 
    // Remove the previously set 3D background colour
 
    private static void Remove3DBackground(
      Database db,
      Transaction tr,
      ObjectId vtrId,
      ObjectId sbId
    )
    {
      // First remove it from the viewport
 
      if (vtrId != ObjectId.Null)
      {
        ViewportTableRecord vtr =
          (ViewportTableRecord)tr.GetObject(
            vtrId,
            OpenMode.ForWrite
          );
        vtr.Background = ObjectId.Null;
      }
 
      // And then erase the object itself (although
      // I suspect this is redundant)
 
      if (sbId != ObjectId.Null)
      {
        SolidBackground sb =
          (SolidBackground)tr.GetObject(
            sbId,
            OpenMode.ForRead,
            true
          );
        if (!sb.IsErased)
        {
          sb.UpgradeOpen();
          sb.Erase();
        }
      }
    }
 
    // Return a grayscale version of a provided bitmap,
    // with the option of forcing non-background pixels to
    // be black
 
    public static Bitmap ConvertToGrayscale(
      Bitmap src,
      System.Drawing.Color bgcol,
      bool force,
      System.Drawing.Color fgcol
    )
    {
      // From http://www.bobpowell.net/grayscale.htm
 
      Document doc =
        Application.DocumentManager.MdiActiveDocument;
      Editor ed = doc.Editor;
 
      Bitmap bmp = new Bitmap(src.Width, src.Height);
      for (int y = 0; y < bmp.Height; y++)
      {
        for (int x = 0; x < bmp.Width; x++)
        {
          System.Drawing.Color c = src.GetPixel(x, y);
          int lum =
            (force && !SameColors(c, bgcol) ?
              0 :
              (int)(c.R * 0.3 + c.G * 0.59 + c.B * 0.11)
            // 0.299R + 0.587G + 0.114B
            );
          bmp.SetPixel(
            x,
            y,
            (lum == 0 ?
              fgcol :
              System.Drawing.Color.FromArgb(lum, lum, lum))
          );
        }
      }
      return bmp;
    }
 
    // Return whether two colour can be considered equivalent
    // in terms of RGB values
 
    private static bool SameColors(
      System.Drawing.Color a,
      System.Drawing.Color b
    )
    {
      // Ignore Alpha channel, just compare RGB
      return (a.R == b.R && a.G == b.G && a.B == b.B);
    }
  }
}

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