Db.Field

[gswifort]

Using this example, I want to insert a reference to a block that contains attributes with fields relating to the state of that block reference. I've added the following to the code:

if att_def.hasFields():
    att_def_field = Db.Field(att_def.getField())
    field_code = att_def_field.getFieldCode(Db.FieldCodeFlag.kAddMarkers)
    att_ref_field = Db.Field(field_code)
    field_id = att_ref.setField(att_ref_field)
    print(att_ref_field.evaluate())
else:
    att_ref.setTextString(att_def.textString())

blockRef.appendAttribute(att_ref)

But the attribute isn't displaying correctly; I get something like this:

[CEXT-Dan]

I think you have to add the attref to the blockref

something like

...
                blockRef.appendAttribute(attref)
                if attdef.hasFields():
                    of = Db.Field(attdef.getField())
                    flag = Db.FieldCodeFlag( Db.FieldCodeFlag.kFieldCode | Db.FieldCodeFlag.kAddMarkers)
                    nf = Db.Field(of.getFieldCode(flag))
                    attref.setField(nf)
                    nf.evaluate()

[gswifort]

doesn't work. I'm posting an example block if you'd like to test it.

visibility_state.zip

[CEXT-Dan]

there's no fields that I see in that block, or attributes, its a dynamic block

[CEXT-Dan]

maybe this thread is relevant?

[CEXT-Dan]

Oh, I see
the field has reference to '?BlockRefId', it seems it has to be replaced with the new object id. I don’t know how AutoCAD does this elegantly

                blockRef.appendAttribute(attref)
                if attdef.hasFields():
                    of = Db.Field(attdef.getField())
                    flag = Db.FieldCodeFlag(
                        Db.FieldCodeFlag.kFieldCode | 
                        Db.FieldCodeFlag.kAddMarkers
                    )
                    fcode = of.getFieldCode(flag)
                    objcode = '%<\\_ObjId {}>%'.format(blockRef.objectId().asOldId())
                    fcode= fcode.replace('?BlockRefId',objcode)
                    #print(fcode)
                    nf = Db.Field(fcode)
                    attref.setField(nf)
                    # regen

[CEXT-Dan]

may be more practical to use insert in Ax

[gswifort]

Thanks, it works!
But the field isn't evaluated. I tried att_ref_field.evaluate() and Db.Core.evaluateFields.
I need to call REGEN after inserting a block.

att_def_field = Db.Field(att_def.getField())
flag = Db.FieldCodeFlag(Db.FieldCodeFlag.kAddMarkers | Db.FieldCodeFlag.kFieldCode)
field_code = att_def_field.getFieldCode(flag)
objcode = f"%<\\_ObjId {block_ref.objectId().asOldId()}>%".format()
field_code = field_code.replace("?BlockRefId", objcode)
att_ref_field = Db.Field(field_code)
# att_ref_field.evaluate()
field_id = att_ref.setField(att_ref_field)
Db.Core.evaluateFields([field_id], Db.FieldEvalContext.kDemand)

[gswifort]

may be more practical to use insert in Ax

I don't want to use Ax because my code tests several positions of the block before actually inserting it. I know this approach isn't ideal either, because the block needs to be added to the database before I can add attributes to it. Should I use Db.TransactionManager?

My code:

@pass_working_db
def get_block_reference(
    btr_id_or_name: Db.ObjectId | str,
    point: UPoint3d = Ge.Point3d(0, 0, 0),
    rotation: float = 0.0,
    scale: float = 1.0,
    db: Db.Database = ...,
):
    if isinstance(btr_id_or_name, str):
        btr_id = get_block_by_name(btr_id_or_name, must_exists=False, db=db)
    elif not isinstance(btr_id_or_name, Db.ObjectId):
        raise TypeError("btr_id_or_name must be a string or Db.ObjectId")
    point = point_3d(point)
    block_ref = Db.BlockReference(point, btr_id)
    block_ref.setScaleFactors(Ge.Scale3d(scale))
    block_ref.setRotation(rotation)
    db.addObject(block_ref)

    block_def = Db.BlockTableRecord(btr_id)
    mt = Ge.Matrix3d.translation(point.asVector())
    mr = Ge.Matrix3d.rotation(rotation, Ge.Vector3d.kZAxis, Ge.Point3d.kOrigin)
    ms = Ge.Matrix3d.scaling(scale, Ge.Point3d.kOrigin)
    matrix = mt * mr * ms
    if block_def.hasAttributeDefinitions():
        for att_def_id in block_def.objectIds(Db.AttributeDefinition.desc()):
            att_def = Db.AttributeDefinition(att_def_id)
            if att_def.isConstant():
                continue
            att_ref = Db.AttributeReference()
            att_ref.setOwnerId(block_ref.objectId())
            att_ref.setPropertiesFrom(att_def)
            att_ref.setInvisible(att_def.isInvisible())
            att_ref.setPosition(att_def.position().transformBy(matrix))
            att_ref.setHeight(att_def.height() * scale)
            att_ref.setRotation(att_def.rotation() + rotation)
            att_ref.setFieldLength(att_def.fieldLength())
            att_ref.setHorizontalMode(att_def.horizontalMode())
            att_ref.setVerticalMode(att_def.verticalMode())
            att_ref.setTag(att_def.tag())
            att_ref.setTextStyle(att_def.textStyle())
            att_ref.setWidthFactor(att_def.widthFactor())
            att_ref.setAlignmentPoint(att_def.alignmentPoint().transformBy(matrix))
            block_ref.appendAttribute(att_ref)
            if att_def.hasFields():
                att_def_field = Db.Field(att_def.getField())
                flag = Db.FieldCodeFlag(Db.FieldCodeFlag.kAddMarkers | Db.FieldCodeFlag.kFieldCode)
                field_code = att_def_field.getFieldCode(flag)
                objcode = f"%<\\_ObjId {block_ref.objectId().asOldId()}>%".format()
                field_code = field_code.replace("?BlockRefId", objcode)
                att_ref_field = Db.Field(field_code)
                # att_ref_field.evaluate()
                field_id = att_ref.setField(att_ref_field)
                Db.Core.evaluateFields([field_id], Db.FieldEvalContext.kDemand)
            else:
                att_ref.setTextString(att_def.textString())

    return block_ref

[CEXT-Dan]

Yeah, it’s actually a nested field, so I don’t know the best approach when dealing with these.
My guess is that you may need to move Db.Core.evaluateFields to an outer scope, it could be the fields won’t update while it’s parent is open

[gswifort]

My guess is that you may need to move Db.Core.evaluateFields to an outer scope,

it doesn't help

[CEXT-Dan]

it works in AutoCAD

import traceback
from pyrx import Rx, Ge, Gs, Db, Ap, Ed
from timeit import default_timer as timer


def addBlockStuff(refid: Db.ObjectId):
    dynref = Db.DynBlockReference(refid)
    if not dynref.isDynamicBlock():
        print("Not Dynamic!: ")
        return
    blockRef = Db.BlockReference(Ge.Point3d(2688.0626,1301.9852,0), dynref.dynamicBlockTableRecord())
    blockrec = Db.BlockTableRecord(dynref.dynamicBlockTableRecord())
    blockrec.database().addToCurrentspace(blockRef)
    if blockrec.hasAttributeDefinitions():
        attdefids = blockrec.objectIds(Db.AttributeDefinition.desc())
        attdefs = [Db.AttributeDefinition(id) for id in attdefids]
        for attdef in attdefs:
            if attdef.isConstant():
                continue
            attref = Db.AttributeReference()
            attref.setPropertiesFrom(attdef)
            attref.setInvisible(attdef.isInvisible())
            basePoint = attdef.position()
            basePoint += blockRef.position().asVector()
            attref.setPosition(basePoint)
            attref.setHeight(attdef.height())
            attref.setRotation(attdef.rotation())
            attref.setFieldLength(attdef.fieldLength())
            attref.setHorizontalMode(attdef.horizontalMode())
            attref.setVerticalMode(attdef.verticalMode())
            attref.setTag(attdef.tag())
            attref.setTextString("XXX")
            blockRef.appendAttribute(attref)
            if attdef.hasFields():
                of = Db.Field(attdef.getField())
                flag = Db.FieldCodeFlag(Db.FieldCodeFlag.kFieldCode | Db.FieldCodeFlag.kAddMarkers)
                fcode = of.getFieldCode(flag)
                objcode = "%<\\_ObjId {}>%".format(blockRef.objectId().asOldId())
                fcode = fcode.replace("?BlockRefId", objcode)
                # print(fcode)
                nf = Db.Field(fcode)
                attref.setField(nf)


@Ap.Command()
def doit():
    try:
        ps, id, _ = Ed.Editor.entSel("\nPick a Block", Db.BlockReference.desc())
        if ps != Ed.PromptStatus.eOk:
            raise RuntimeError("Selection Error! {}: ".format(ps))

        addBlockStuff(id)
        Db.Core.evaluateFields()

    except Exception as err:
        traceback.print_exception(err)

[gswifort]

Not in zwcad. But at least Ed.Core.regen() works

[CEXT-Dan]

Doesn’t work in BricsCAD either.
I found this, which looks to be exactly what I came up with

[CEXT-Dan]

Just a note, Ax space works great for ZwCAD. BricsCAD has issues

def doInsert(name: str):
    axap = Ax.AcadApplication()
    acdoc = axap.activeDocument()
    axSpace = acdoc.modelSpace()
    ref = axSpace.insertBlock(Ge.Point3d(2727, 1300, 0), name, Ge.Scale3d(1), 0)
    return ref.objectId()


@Ap.Command()
def doit():
    try:
        ps, id, _ = Ed.Editor.entSel("\nPick a Block: ", Db.BlockReference.desc())
        if ps != Ed.PromptStatus.eOk:
            raise RuntimeError("Selection Error! {}: ".format(ps))
        ref = Db.BlockReference(id)
        newid = doInsert(ref.getBlockName())
        newref = Db.BlockReference(newid)
        atts = [Db.AttributeReference(_id) for _id in newref.attributeIds()]
        for att in atts:
            print(att.hasFields())
    except Exception as err:
        traceback.print_exception(err)