Hatch.md

Hatch Class

Overview

The Hatch class represents a filled area with a pattern or solid fill in AutoCAD.

Namespace

Autodesk.AutoCAD.DatabaseServices

Inheritance Hierarchy

System.Object
  └─ RXObject
      └─ DBObject
          └─ Entity
              └─ Hatch

Key Properties

Property	Type	Description
PatternName	string	Gets/sets the hatch pattern name
PatternScale	double	Gets/sets the pattern scale
PatternAngle	double	Gets/sets the pattern angle
NumberOfLoops	int	Gets the number of boundary loops
Associative	bool	Gets/sets whether hatch is associative
HatchStyle	HatchStyle	Gets/sets the hatch style
Area	double	Gets the hatch area

Key Methods

Method	Return Type	Description
AppendLoop(HatchLoopTypes, ObjectIdCollection)	void	Adds a boundary loop
SetHatchPattern(HatchPatternType, string)	void	Sets the hatch pattern
EvaluateHatch(bool)	void	Evaluates/regenerates the hatch

Code Examples

Example 1: Creating a Solid Hatch

using (Transaction tr = db.TransactionManager.StartTransaction())
{
    BlockTableRecord btr = tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite) as BlockTableRecord;
    
    // Create a circle to hatch
    Circle circle = new Circle(new Point3d(100, 100, 0), Vector3d.ZAxis, 50);
    btr.AppendEntity(circle);
    tr.AddNewlyCreatedDBObject(circle, true);
    
    // Create hatch
    Hatch hatch = new Hatch();
    btr.AppendEntity(hatch);
    tr.AddNewlyCreatedDBObject(hatch, true);
    
    // Set to solid fill
    hatch.SetHatchPattern(HatchPatternType.PreDefined, "SOLID");
    
    // Add boundary
    ObjectIdCollection boundaryIds = new ObjectIdCollection();
    boundaryIds.Add(circle.ObjectId);
    hatch.AppendLoop(HatchLoopTypes.Default, boundaryIds);
    
    // Evaluate
    hatch.EvaluateHatch(true);
    
    tr.Commit();
}

Related Objects

• Entity - Base class
• Polyline - Common boundary type

References

• Autodesk Official Documentation