To convert a region to a polyline in AutoCAD using ObjectARX, you would typically follow these steps:
- Open the AcDbRegion object.
- Explode the region to get the constituent curves.
- Use the AcDbVoidPtrArray returned by the explode operation.
- Create a new polyline and add the exploded curves to it.
- Erase the original region if necessary.
Here’s a simplified code snippet that outlines the process:
// Assume pRegion is a pointer to your AcDbRegion object
AcDbVoidPtrArray curveSegments;
pRegion->explode(curveSegments); // Explode the region into constituent curves
// Create a new polyline
AcDbPolyline* pPolyline = new AcDbPolyline();
// Iterate through the curve segments and add them to the polyline
for (int i = 0; i < curveSegments.length(); ++i) {
AcDbEntity* pEntity = static_cast<AcDbEntity*>(curveSegments[i]);
// Check if the entity is a line, arc, or spline and add it to the polyline
// You may need to convert arcs and splines to polyline segments
}
// Add the polyline to the drawing and erase the original region if needed
Remember to handle memory management appropriately when working with pointers and arrays in ObjectARX.
