TransformBy BlockReference non-uniformly

[schoeller]

Dear all,

I am trying to non-uniformly shape a blockref inserted. I have a defined a helper function as follows:

        blockId = insertBlockRef(db, blkid, anchor)
        translateRotateShift(blockId, Ge.Vector3d(2,2,-2), 2, .5, 0, 30)

It is defined subsequently

# trying first translation only
def translateRotateShift(id: Db.ObjectId, vector: Ge.Vector3d, scalex: float, scaley: float, scalez: float, angle: float):
    ent = Db.Entity(id, Db.OpenMode.ForWrite)
    mat = Ge.Matrix3d()
    mat.setToTranslation(vector)
    ent.transformBy(m)
    return True

It throws as follows

PyDb.ErrorStatusException: Exception!(eCannotScaleNonUniformly), function transformBy, Line 437, File PyDbEntity.cpp:

Hints on how to achieve the desired behaviour are kindly appreciated.

Best

Seb

[CEXT-Dan]

Some objects cannot be scaled non-uniformly, you may be able to explode all the objects in the block table record before creating the reference

[gswifort]

This isn't exactly what you're asking for, but it should help. Ask if you have any further problems

from __future__ import annotations

import collections.abc as c

from pyrx import Db, Ge, command


class TempBlock:
    def __init__(
        self,
        objs: c.Iterable[Db.Entity],
        pos: Ge.Point3d = Ge.Point3d(0.0, 0.0, 0.0),
        scale: Ge.Scale3d | None = None,
        rotation: float | None = None,
        db: Db.Database | None = None,
    ):
        self._objs = tuple(objs)
        self._pos = pos
        self._scale = scale
        self._rotation = rotation
        self._db = db

        self._btr_id: Db.ObjectId | None = None

    def iter_objs(self):
        for obj in self._objs:
            if obj.isNullObj():
                yield obj
            else:
                yield Db.Entity.cloneFrom(obj)

    def create_btr(self) -> Db.BlockTableRecord:
        btr = Db.BlockTableRecord()
        objs = tuple(self.iter_objs())
        btr.appendAcDbEntities(objs)
        db = self._db or Db.workingDb()
        bt = Db.BlockTable(db.blockTableId(), Db.OpenMode.kForWrite)
        return bt.add(btr)

    def create_bref(self) -> Db.BlockReference:
        self._btr_id = self.create_btr()
        bref = Db.BlockReference(self._pos, self._btr_id)
        if self._scale is not None:
            bref.setScaleFactors(self._scale)
        if self._rotation is not None:
            bref.setRotation(self._rotation)
        return bref

    def __enter__(self):
        return self.create_bref()

    def __exit__(self, exc_type, exc_value, traceback):
        if self._btr_id is not None:
            Db.BlockTableRecord(self._btr_id, Db.OpenMode.kForWrite).erase()
            self._btr_id = None


def temp_block(
    objs: c.Iterable[Db.Entity],
    pos: Ge.Point3d = Ge.Point3d(0.0, 0.0, 0.0),
    scale: Ge.Scale3d | None = None,
    rotation: float | None = None,
    db: Db.Database | None = None,
) -> TempBlock:
    """
    Context manager to create a temporary block reference with the given objects.
    """
    return TempBlock(objs, pos, scale, rotation, db)


@command
def doit():
    circle = Db.Circle(Ge.Point3d(0, 0, 0), Ge.Vector3d(0, 0, 1), 5)
    pline = Db.Polyline(
        [
            Ge.Point3d(0, 0, 0),
            Ge.Point3d(5, 0, 0),
            Ge.Point3d(5, 5, 0),
            Ge.Point3d(0, 5, 0),
            Ge.Point3d(0, 0, 0),
        ]
    )

    with temp_block(
        [circle, pline], 
        pos=Ge.Point3d(10, 10, 0), 
        scale=Ge.Scale3d(-2, 1.5, 1), 
        rotation=0.5,
    ) as bref:
        Db.curDb().addToModelspace(bref.explode())

[gswifort]

I had a similar problem when creating this code, it probably resulted from incorrect management of the object life cycle - that's why separate functions .create_btr() and .create_bref() are necessary

[schoeller]

@gswifort Sorry for this mess in the Q&A section. I am a little lost. I have tried to transform entities before block creation in order to be able to properly insert at a later stage. In my thinking I am creating a Ge.Matrix3d() object, configure that and then apply it to the entity using transformBy. Seems like I am not getting it right...

[schoeller]

Closing this in favor of #349