StartAng and endAng of Ge.CircArc3d.cast Incorrectly obtained?

[royccg]

I use the following code to get the parameters of the arc.

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

@command
def doit():
    """
    return:
    curves = [
        {"type": "Line", "start": (0, 0), "end": (100, 0)},
        {"type": "Arc", "center": (100, 10), "radius": 10, "start_angle": 270, "end_angle": 360},
        {"type": "Line", "start": (110, 10), "end": (0, 10)},
        {"type": "Arc", "center": (0, 10), "radius": 10, "start_angle": 0, "end_angle": 90},
    ]
    """
    
    ent_line, id, _ = Ed.Editor.entSel("\nSelect road center line: ")
    if ent_line != Ed.PromptStatus.eOk:
        return

    ent = Db.Entity(id)
    pe = Db.AssocPersSubentIdPE(ent.queryX(Db.AssocPersSubentIdPE.desc()))
    curves = []
    for edge in pe.getAllSubentities(ent, Db.SubentType.kEdgeSubentType):
        curve = pe.getEdgeSubentityGeometry(ent, edge)

        if curve.type() in [Ge.EntityId.kCircArc3d, Ge.EntityId.kCircArc2d]: 
            curve = Ge.CircArc3d.cast(curve) if curve.type() == Ge.EntityId.kCircArc3d else Ge.CircArc2d.cast(curve)
            curves.append({
                "type": "Arc",
                "center": curve.center().toTuple(),
                "radius": curve.radius(),
                "start_radian": curve.startAng(),
                "end_radian": curve.endAng()
            })
            print(f"Circle center: {curve.center()}, radius: {curve.radius()}, start_angle: {curve.startAng()}, end_angle: {curve.endAng()}")
            print(f"Circle start: {curve.startPoint()}, end: {curve.endPoint()}")

When I select a single arc, the parameters are correct;
But when I select a polyline, the angles of the start and end points are wrong.

[CEXT-Dan]

That’s strange! I’ll have to investigate that. Note, I only make the wrappers, I don’t do any of the implementation so the best I can do is file a bug report with Autodesk.

If you are always working with curves, you might try something like this

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

def appendCurveData(curve, curves):
    curves.append(
        {
            "type": "Arc",
            "center": curve.center().toTuple(),
            "radius": curve.radius(),
            "start_radian": curve.startAng(),
            "end_radian": curve.endAng(),
        }
    )

@command()
def doit():
    try:
        ent_line, id, _ = Ed.Editor.entSel("\nSelect road center line: ", Db.Curve.desc())
        if ent_line != Ed.PromptStatus.eOk:
            return

        curves = []

        dbc = Db.Curve(id)
        gec = dbc.getAcGeCurve()
        if gec.type() == Ge.EntityId.kCircArc3d:
            appendCurveData(Ge.CircArc3d.cast(gec), curves)

        elif gec.type() == Ge.EntityId.kCompositeCrv3d:
            cc = Ge.CompositeCurve3d.cast(gec)
            for c in cc.getCurveList():
                if c.type() == Ge.EntityId.kCircArc3d:
                    appendCurveData(Ge.CircArc3d.cast(c), curves)

        print(curves)

    except Exception as err:
        traceback.print_exc(err)

[CEXT-Dan]

I recommend using AcGeCurve sample, but if you really need to use AssocPersSubentIdPE, I found a workaround by doing a conversion. I hope this sample will illustrate it

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


def appendCurveData(curve, curves):
    curves.append(
        {
            "type": "kCircArc3d",
            "center": curve.center().toTuple(),
            "radius": curve.radius(),
            "start_radian": curve.startAng(),
            "end_radian": curve.endAng(),
        }
    )


@command
def doit():
    db = Db.curDb()
    ent_line, id, _ = Ed.Editor.entSel("\nSelect road center line: \n")
    if ent_line != Ed.PromptStatus.eOk:
        return

    ent = Db.Entity(id)
    pe = Db.AssocPersSubentIdPE(ent.queryX(Db.AssocPersSubentIdPE.desc()))
    curves = []
    for edge in pe.getAllSubentities(ent, Db.SubentType.kEdgeSubentType):
        curve = pe.getEdgeSubentityGeometry(ent, edge)
        print(curve.type())
        if curve.type() == Ge.EntityId.kCircArc3d:
            
            #convert to a AcDbCurve
            dbc = Db.Core.convertGelibCurveToAcDbCurve(curve)
            
            #this makes a proper arc
            #db.addToModelspace(Db.Core.convertGelibCurveToAcDbCurve(curve))
            
            #convert back to a AcGeCurve3d
            gec = Db.Core.convertAcDbCurveToGelibCurve(dbc)
            appendCurveData(Ge.CircArc3d.cast(gec), curves)
    print(curves)


@command()
def doit2():
    try:
        ent_line, id, _ = Ed.Editor.entSel("\nSelect road center line: \n", Db.Curve.desc())
        if ent_line != Ed.PromptStatus.eOk:
            return

        curves = []

        dbc = Db.Curve(id)
        gec = dbc.getAcGeCurve()
        if gec.type() == Ge.EntityId.kCircArc3d:
            appendCurveData(Ge.CircArc3d.cast(gec), curves)

        elif gec.type() == Ge.EntityId.kCompositeCrv3d:
            cc = Ge.CompositeCurve3d.cast(gec)
            for c in cc.getCurveList():
                if c.type() == Ge.EntityId.kCircArc3d:
                    appendCurveData(Ge.CircArc3d.cast(c), curves)

        print(curves)

    except Exception as err:
        traceback.print_exc(err)

[royccg]

Thanks a lot. The two way all can work. But I am confused about the difference between Ge and Db？

[CEXT-Dan]

AcGe classes only contain geometry to do calculations on, they have no ObjectId, no layers or styles
AcDb classes a members of the drawing, is what you see on the screen

I Recommend getting a copy of the ObjectARX SDK

it’s very handy to have the CHM documentation

[royccg]

Thanks. I'm really not familiar with the secondary development of CAD.