TraceBoundary sample in Python for AutoCAD

 

 

import traceback

from pyrx import Ap, Db, Ed, Ge, Gi

@Ap.Command()

def TB() -> None:

    try:

        db = Db.curDb()

        ps, pnt = Ed.Editor.getPoint("\nPick a point")

        if ps != Ed.PromptStatus.eOk:

            return

        for pline in Ed.Editor.traceBoundary(pnt, False):

            pline.setColorIndex(1)

            db.addToCurrentspace(pline)

    except Exception as err:

        traceback.print_exception(err)

 

 

How to make a Revcloud in Python for AutoCAD

 

There isn’t a “revcloud” entity type in Autocad, but you can make one with a polyline and enlisting the help of send command.  Here’s the sample code

 

import traceback

from pyrx import Ap, Ax, Db, Ed, Ge, Gi

@Ap.Command()

def myrevcloud() -> None:

    try:

        axApp = Ap.Application.acadApplication()

        doc = axApp.activeDocument()

        ms = doc.modelSpace()

        # coords for the cloud and create a polyline

        coords = [

            Ge.Point3d(0, 0, 0),

            Ge.Point3d(0, 1000, 0),

            Ge.Point3d(1000, 1000, 0),

            Ge.Point3d(1000, 0, 0),

            Ge.Point3d(0, 0, 0),

        ]

        pl = ms.addPolyline(coords)

        # use send command to create the revcloud, note the (A)arc length

        handle = '(handent "{}")'.format(pl.handle())

        doc.sendCommand("revcloud A {} Object {} Y ".format(200, handle))

    except Exception as err:

        traceback.print_exception(err)

 

And the result:

 

Python for AutoCAD, Using shapely to find an oriented bounding box.

 

I see this asked frequently in the AutoCAD forums “How do I get the bounding box of an entity”, and the standard answer is usually, “Use vla-GetBoundingBox”, or get the entity extents. This is the correct answer, caveat, the bounding box is aligned with WCS, so if your object is rotated the result may not be what you need.

 One option is to transform the object to align with WCS. Or we can use a 3^rd party tool like Python’s shapely to help. 

 

here's an example:

import traceback

from pyrx import Ap, Ax, Db, Ed, Ge, Gi

from shapely import LineString

@Ap.Command()

def mybb() -> None:

    try:

        # create a selection set filter and select the polylines

        filter = [(Db.DxfCode.kDxfStart, "LWPOLYLINE")]

        ps, ss = Ed.Editor.selectPrompt("\nSelect parts: ", "\nRemove parts: ", filter)

        if ps != Ed.PromptStatus.eNormal:

            return

        # iterate the selection set

        for id in ss:

            # create a LineString from our polylines

            pline = Db.Polyline(id)

            ls = LineString(pline.toList())

            # get the oriented bbox

            coords = ls.oriented_envelope.exterior.coords

            # convert tuples to Ge.Point3d

            points = [Ge.Point3d(p) for p in coords]

            # #draw the results

            Ed.Core.grDraw(points[0], points[1], 1, 0)

            Ed.Core.grDraw(points[1], points[2], 1, 0)

            Ed.Core.grDraw(points[2], points[3], 1, 0)

            Ed.Core.grDraw(points[3], points[0], 1, 0)

    except Exception as err:

        traceback.print_exception(err)