Model / Render Type GsClassFactory

Anonymous — Fri, 18 Jan 2013 19:19:34 GMT

Anyone know the equivalent of getting a AcGsModel with a render type of kDirect similar to that of the old BlockView example in ObjectArx. The function used the AcGsClassFactory::createModel(...) but I cannot seem to find an equivalent to this in .Net.

I am currently using an in-memory Database to display graphical objects. Now I want to add "Ghost" objects to the View where they are not added to the Database and displayed over-top of the database resident objects. How can I accomplish this in .Net.

Any tips would be appreciated.

Thanks

Mike

Re: Model / Render Type GsClassFactory

norman.yuan — Fri, 18 Jan 2013 23:21:16 GMT

Maybe TransientGraphics?

Re: Model / Render Type GsClassFactory

DiningPhilosopher — Sun, 20 Jan 2013 09:21:43 GMT

Have you looked at the BlockView.NET sample?

Re: Model / Render Type GsClassFactory

Anonymous — Sun, 20 Jan 2013 14:23:14 GMT

I have, and based my view on that. The difference is that the BlockView .Net example does not include the orbit object which the original block view has.

- Mike

Re: Model / Render Type GsClassFactory

fenton_webb — Fri, 25 Jan 2013 19:17:16 GMT

It seems like the transient api is definitely the way for you... Check out Keans blog http://through-the-interface.typepad.com/through_the_interface/2011/03/using-transient-graphics-to-simulate-autocads-move-command-using-net.html

In terms of creating an AutoCAD model using .NET, here's some code that might be useful to someone. I wrote it pretty quickly so please excuse any bugs, logic errors.

// command to generate DWG and Block thumbnail bitmaps

// by Fenton Webb, DevTech, 24/1/2013

[CommandMethod("GENERATETHUMBS")]

public void GenerateThumbnailBitmaps()

{

Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;

// get the output path for the bitmaps

PromptStringOptions opts = new PromptStringOptions("\nEnter output path : ");

opts.AllowSpaces = true;

PromptResult res = ed.GetString(opts);

// if ok

if (res.Status == PromptStatus.OK)

{

try

{

// make sure the folder exists

DirectoryInfo outputPathInfo = new DirectoryInfo(res.StringResult);

if (outputPathInfo.Exists)

{

Point2d screenSize = (Point2d)Application.GetSystemVariable("SCREENSIZE");

// set up the image sizes

int width = (int)screenSize.X;

int height = (int)screenSize.Y;

Document doc = Application.DocumentManager.MdiActiveDocument;

Database db = doc.Database;

// get the dwg file name

FileInfo dwgPath = new FileInfo(doc.Name);

// get the document graphics system manager

Manager gsm = doc.GraphicsManager;

// construct the default filename prefix and path

string defaultPath = outputPathInfo.FullName + "\\" + dwgPath.Name.Replace(".dwg", " ");

// first generate the MS screen shot

View acadView = gsm.GetGsView(2, true);

Rectangle rect = new Rectangle(0, 0, width, height);

using (Bitmap msBmp = acadView.GetSnapshot(rect))

msBmp.Save(defaultPath + " MS.bmp");

// now set the block sizes to something standard

width = 800;

height = 600;

// now generate the layout images

// first remember the current layout

string currentLayout = LayoutManager.Current.CurrentLayout;

// now lets loop the layouts, open the layout dict

using (DBDictionary layoutDict = db.LayoutDictionaryId.Open(OpenMode.ForRead) as DBDictionary)

{

// now iterate the layouts and get the names

foreach (DBDictionaryEntry layoutEntry in layoutDict)

{

string layoutName = layoutEntry.Key;

LayoutManager.Current.CurrentLayout = layoutName;

using (Bitmap layoutBmp = doc.CapturePreviewImage((uint)width, (uint)height))

layoutBmp.Save(defaultPath + " " + layoutName + ".bmp");

/*View layoutView = gsm.GetGsView(1, true);

rect = new Rectangle(0, 0, width, height);

using (Bitmap layoutBmp = layoutView.GetSnapshot(rect))

layoutBmp.Save(defaultPath + " " + layoutName + ".bmp");*/

}

// restore the original layout

LayoutManager.Current.CurrentLayout = currentLayout;

// now create an off screen device

using (Device offDevice = gsm.CreateAutoCADOffScreenDevice())

{

// now size the device

offDevice.OnSize(new System.Drawing.Size(width, height));

// now create the view

using (View view = new View())

{

// add the new view object to the device

offDevice.Add(view);

// update it

offDevice.Update();

// ok now create the model

using (Model model = gsm.CreateAutoCADModel())

{

using (BlockTable bt = db.BlockTableId.Open(OpenMode.ForRead) as BlockTable)

{

// now iterate through our block tables

foreach (ObjectId id in bt)

{

// open the btr for read

using (BlockTableRecord btr = id.Open(OpenMode.ForRead) as BlockTableRecord)

{

// get the name of the block for the BMP file name

string btrName = btr.Name;

// add the btr to the view

view.Add(btr, model);

try

{

// get the extents of the btr

Extents3d extents = new Extents3d();

extents.AddBlockExtents(btr);

// now zoom extents of the view

view.ZoomExtents(extents.MinPoint, extents.MaxPoint);

// finally, construct the filepath

string imagePath = defaultPath + btrName + " Block.bmp";

// clean up the path

imagePath = imagePath.Replace("*", "");

// snap the image

rect = new Rectangle(0, 0, width, height);

using (Bitmap blockBmp = view.GetSnapshot(rect))

blockBmp.Save(imagePath);

}

catch

{

}

// reset the view for the next iteration

view.EraseAll();

}

offDevice.EraseAll();

}

else

ed.WriteMessage("\nThe Path is invalid: " + res.StringResult);

}

catch

{

ed.WriteMessage("\nThe Path cannot be written to: " + res.StringResult);

}

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