using System;
using System.Collections.Generic;
using System.Xml.Linq;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Runtime;
[assembly: CommandClass(typeof(DuctBlockTagger.Plugin))]
namespace DuctBlockTagger
{
public class Plugin
{
private Dictionary<ObjectId, ObjectId> blockToTextMap = new Dictionary<ObjectId, ObjectId>();
private ObjectId textStyleId;
private string layer;
private double textHeight;
[CommandMethod("DT")]
public void DuctTagger()
{
Document doc = Application.DocumentManager.MdiActiveDocument;
Database db = doc.Database;
Editor ed = doc.Editor;
// Check if the sample MText properties are set
if (textStyleId == ObjectId.Null || string.IsNullOrEmpty(layer) || textHeight <= 0)
{
ed.WriteMessage("\nSample MText parameters not set. Use the ST command to set them.");
return;
}
using (Transaction tr = db.TransactionManager.StartTransaction())
{
// Prompt user to select multiple duct block references
PromptSelectionOptions pso = new PromptSelectionOptions();
pso.MessageForAdding = "\nSelect duct block references: ";
pso.RejectObjectsOnLockedLayers = true;
SelectionFilter filter = new SelectionFilter(new TypedValue[] { new TypedValue((int)DxfCode.Start, "INSERT") });
PromptSelectionResult psr = ed.GetSelection(pso, filter);
if (psr.Status != PromptStatus.OK)
{
ed.WriteMessage("\nNo valid duct block references selected.");
return;
}
// Process each selected block reference
foreach (SelectedObject selObj in psr.Value)
{
if (selObj != null)
{
BlockReference blkRef = tr.GetObject(selObj.ObjectId, OpenMode.ForRead) as BlockReference;
if (blkRef != null)
{
// Get duct parameters
double cfm = GetPropertyValue(blkRef, "CFM");
double width = GetPropertyValue(blkRef, "Width");
double height = GetPropertyValue(blkRef, "Height");
// Check if parameters are valid
if (cfm <= 0 || width <= 0 || height <= 0)
{
ed.WriteMessage($"\nError: Duct parameters for block {blkRef.Handle} cannot be zero or negative.");
continue;
}
// Construct tag value
string tagValue = $"{cfm} CFM,\n{width} x {height} mm";
// Calculate the center of the block reference
Point3d tagPosition = GetBlockReferenceCenter(blkRef);
// Create text annotation using MText
ObjectId mTextId = CreateTextAnnotation(tagValue, tagPosition, tr, db.BlockTableId, textStyleId, layer, textHeight);
// Map block reference to MText for future updates
blockToTextMap[blkRef.ObjectId] = mTextId;
// Subscribe to BlockReference modification event
blkRef.Modified += new EventHandler(OnBlockReferenceModified);
}
}
}
tr.Commit();
}
}
[CommandMethod("ST")]
public void SetSampleText()
{
Document doc = Application.DocumentManager.MdiActiveDocument;
Database db = doc.Database;
Editor ed = doc.Editor;
// Ask user to select a sample MText for parameters
PromptEntityOptions mtextPeo = new PromptEntityOptions("\nSelect a sample MText for parameters: ");
mtextPeo.SetRejectMessage("\nInvalid selection. Please select an MText entity.");
mtextPeo.AddAllowedClass(typeof(MText), true);
PromptEntityResult mtextPer = ed.GetEntity(mtextPeo);
if (mtextPer.Status != PromptStatus.OK)
{
ed.WriteMessage("\nNo valid MText selected.");
return;
}
using (Transaction tr = db.TransactionManager.StartTransaction())
{
MText sampleMText = tr.GetObject(mtextPer.ObjectId, OpenMode.ForRead) as MText;
if (sampleMText == null)
{
ed.WriteMessage("\nInvalid MText entity selected.");
return;
}
// Store the MText properties for future use
textStyleId = sampleMText.TextStyleId;
layer = sampleMText.Layer;
textHeight = sampleMText.TextHeight;
ed.WriteMessage("\nSample MText parameters set successfully.");
tr.Commit();
}
}
private double GetPropertyValue(BlockReference blkRef, string propertyName)
{
foreach (DynamicBlockReferenceProperty prop in blkRef.DynamicBlockReferencePropertyCollection)
{
if (prop.PropertyName.Equals(propertyName, StringComparison.InvariantCultureIgnoreCase))
{
return Convert.ToDouble(prop.Value);
}
}
return 0;
}
private Point3d GetBlockReferenceCenter(BlockReference blkRef)
{
Extents3d extents = blkRef.GeometricExtents;
Point3d center = new Point3d(
(extents.MinPoint.X + extents.MaxPoint.X) / 2,
(extents.MinPoint.Y + extents.MaxPoint.Y) / 2,
(extents.MinPoint.Z + extents.MaxPoint.Z) / 2
);
return center;
}
private ObjectId CreateTextAnnotation(string tagValue, Point3d tagPosition, Transaction tr, ObjectId blockTableId, ObjectId textStyleId, string layer, double textHeight)
{
BlockTable bt = tr.GetObject(blockTableId, OpenMode.ForRead) as BlockTable;
BlockTableRecord btr = tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite) as BlockTableRecord;
// Create a new MText entity for the tag
using (MText mText = new MText())
{
mText.Location = tagPosition;
mText.TextHeight = textHeight;
mText.Contents = tagValue;
mText.TextStyleId = textStyleId;
mText.Layer = layer;
mText.SetDatabaseDefaults();
// Add the MText entity to the model space
btr.AppendEntity(mText);
tr.AddNewlyCreatedDBObject(mText, true);
return mText.ObjectId;
}
}
private void OnBlockReferenceModified(object sender, EventArgs e)
{
BlockReference blkRef = sender as BlockReference;
if (blkRef == null)
return;
Document doc = Application.DocumentManager.MdiActiveDocument;
Database db = doc.Database;
using (Transaction tr = db.TransactionManager.StartTransaction())
{
try
{
UpdateTextAnnotation(blkRef, tr);
tr.Commit();
}
catch (System.Exception ex)
{
Autodesk.AutoCAD.ApplicationServices.Application.ShowAlertDialog($"Error updating annotation: {ex.Message}");
}
}
}
private void UpdateTextAnnotation(BlockReference blkRef, Transaction tr)
{
if (!blockToTextMap.ContainsKey(blkRef.ObjectId))
return;
ObjectId mTextId = blockToTextMap[blkRef.ObjectId];
MText mText = tr.GetObject(mTextId, OpenMode.ForWrite) as MText;
if (mText != null)
{
double cfm = GetPropertyValue(blkRef, "CFM");
double width = GetPropertyValue(blkRef, "Width");
double height = GetPropertyValue(blkRef, "Height");
if (cfm > 0 && width > 0 && height > 0)
{
mText.Contents = $"{cfm} CFM,\n{width} x {height} mm";
}
}
}
}
}
in this above code i can extract parameter value and i can modify the Mtext as a annotation dynamically but this plug in code only working in one time i need to work on Multiple Autocad Sessions. Kindly help anyone where i need to change and what line i need to modify
