BCAD V24 civil samples

[schoeller]

thx for everything. when creating volume surfaces I manage for

1#
initialize(class PyBrxCvDbVolumeSurface {lvalue}, class PyBrxCvDbTinSurface, double, enum BrxCvDbVolumeSurface::EVolumeSurfaceType, class PyDbObjectId, double)
=>vSurface.initialize(pSurface, cSurface, [])

2#
initialize(class PyBrxCvDbVolumeSurface {lvalue}, class PyBrxCvDbTinSurface, double, enum BrxCvDbVolumeSurface::EVolumeSurfaceType, class boost::python::list)
=>vSurface.initialize(pSurface, elev, []) => not working
=>vSurface.initialize(pSurface, elev, Cv.VolumeSurfaceType.eTinVolumeToElevation, []) => tata! working!

[CEXT-Dan]

Hi, Did I make a mistake?

[schoeller]

Nope, just opened up a comm channel. Interface for 1# and 2# is different. Supposedly format 2# is consistent for all.

[CEXT-Dan]

Really great samples!
Thank you for taking the time to do this. Especially with no documentation!

[schoeller]

Whenever I find the time I wish to add pending examples from the SDK (hobbyist endeavour of an occasional scripter). It's a pleasure to learn from your coding and answer culture. The open issues (GeoCoordinateSystem, Labeling System, SDK documentation) hopefully will be resolved in order not to become frustrating dead-ends... and maybe one day your project becomes an opensource foundation with CAD producers and other private entities securing future development the like to the benefit of end users.

[schoeller]

I have trouble with TIN merge. case 0 works, bute case 1 doesn't. Ought I to initialize the surface somehow? Help appreciated.

        match ssResult[1]:
            case 0:
                try:
                    fSurface.merge(sSurface)
                    print("\nMerged second to first surface")
                except:
                    print("\nMerging surfaces failed")
            case 1:
                try:
                    nSurface = Cv.CvDbTinSurface()
                    nSurface.merge(fSurface.merge(sSurface))
                    db.addToModelspace(nSurface)
                    print("\nCreating new surface from first and second")
                except:

[CEXT-Dan]

The BRX API has both a static merge, and an instance merge which confused python
I had to rename them

From:

// merge another surface into this surface entity
bool merge(const BrxCvDbTinSurface* theOther);

// merge 2 surfaces and create new surface
static BrxCvDbTinSurface* merge(const BrxCvDbTinSurface* theOne, const BrxCvDbTinSurface* theOther);

To:

bool merge(const PyBrxCvDbTinSurface& theOther);
static PyBrxCvDbTinSurface  mergeSurfaces(const PyBrxCvDbTinSurface& theOne, const PyBrxCvDbTinSurface& theOther);

[schoeller]

Cheers. Cannot see it in the VS Code typing propositions

Not working as follows:

                    nSurface = Cv.CvDbTinSurface()
                    nSurface.mergeSurfaces(fSurface, sSurface)

[CEXT-Dan]

ouch, I must have missed that!

[schoeller]

Have casted an element from a vertical view like so
arc: Cv.CvDbVAlignmentArc = Cv.CvDbVAlignmentArc.cast(element)
Would like to fetch midpoint from arc-segment and max-vertical or min-vertical point depending.

Hints appreciated.

[CEXT-Dan]

Hi, can you post a sample drawing, or add a drawing to \unitTests\testmedia
CvDbVAlignment is derived from Curve, so you should be able to use curve methods like

        vAlignment.getParamAtPoint
        vAlignment.getPointAtParam
        vAlignment.getPointAtDist

but I'd like to create a test

[CEXT-Dan]

it's actually a bit difficult, I hope this sample will intrastate the steps

import traceback
from pyrx_imp import Rx, Ge, Gi, Db, Ap, Ed, Cv

def getIds(vAlignment):
    try:
        ids = []
        elementId = vAlignment.firstElementId()
        while elementId != 0:
            element = vAlignment.elementAtId(elementId)
            if elementId != 0:
                ids.append(elementId)
            elementId = element.nextId()
        return ids

    except Exception as err:
        traceback.print_exception(err)

def PyRxCmd_doit():
    try:
        #select the view, wee need this to transform
        vsel = Ed.Editor.entSel("\nSelect Alignment: ", Cv.CvDbVAlignmentView.desc())
        if vsel[0] != Ed.PromptStatus.eOk:
            print("Oops {}: ".format(vsel[0]))
        vAlignmentView = Cv.CvDbVAlignmentView(vsel[1], Db.OpenMode.kForRead)

        # select the vAlignment
        esel = Ed.Editor.entSel("\nSelect Alignment: ", Cv.CvDbVAlignment.desc())
        if esel[0] != Ed.PromptStatus.eOk:
            print("Oops {}: ".format(esel[0]))
        vAlignment = Cv.CvDbVAlignment(esel[1], Db.OpenMode.kForRead)
        
        for id in getIds(vAlignment):
            element = vAlignment.elementAtId(id)
            print(element.type())

            if element.type() != Cv.VAlignmentElementType.eParabola:
                continue

            parabola: Cv.CvDbVAlignmentParabola = Cv.CvDbVAlignmentParabola.cast(element)
            
            #get the end pointd for this section
            sp2d = parabola.startPoint()
            ep2d = parabola.endPoint()
            
            #calc the mid param and use getPointAtDist
            sp = vAlignment.getParamAtPoint(Ge.Point3d(sp2d.x,sp2d.y,0.0))
            ep = vAlignment.getParamAtPoint(Ge.Point3d(ep2d.x,ep2d.y,0.0))
            mp = (ep - sp)
            mid = vAlignment.getPointAtDist(mp)
            
            # transform the point from to WCS
            mid.x = vAlignmentView.toWCSX(mid.x)
            mid.y = vAlignmentView.toWCSY(mid.y)
            Ed.Core.grDrawCircle(mid,1.0,24,1)

    except Exception as err:
        traceback.print_exception(err)

[schoeller]

I had to use getDistAtPoint only

            sp = vAlignment.getDistAtPoint(Ge.Point3d(sp2d.x,sp2d.y,0.0))
            ep = vAlignment.getDistAtPoint(Ge.Point3d(ep2d.x,ep2d.y,0.0))
            mp = (ep - sp)/2 + sp

[schoeller]

Thanks for your answer. Below will be useful for the midpoint.

        #calc the mid param and use getPointAtDist
        sp = vAlignment.getParamAtPoint(Ge.Point3d(sp2d.x,sp2d.y,0.0))
        ep = vAlignment.getParamAtPoint(Ge.Point3d(ep2d.x,ep2d.y,0.0))
        mp = (ep - sp)
        mid = vAlignment.getPointAtDist(mp)

Drawing works for me using the vAlignmentView as a reference

        # transform the point from to WCS
        mid.x = vAlignmentView.toWCSX(mid.x)
        mid.y = vAlignmentView.toWCSY(mid.y)
        Ed.Core.grDrawCircle(mid,1.0,24,1)

I do it like this

if prevElement: #We have a previous element, then draw
    self.blkref4.setPosition(Ge.Point3d(arc.startPoint().x+aview.origin().x, arc.startPoint().y+aview.origin().y-aview.baseElevation(), 0))

Remaining question is how one would find the local minimum/maximum within the arc segment. In your case it would be somewhere here.

One could iterate for the max vertical distance to a horizontal line, but I am looking for a smoother way to determine the sag/crest.
Find my sample file attached. The override is not finished yet.
vAlign_1.zip

[CEXT-Dan]

I tried to call getAcGeCurve as it has more useful functions

but it’s not implemented by BricsCAD

Exception!(eNotImplementedYet) in function getAcGeCurve, Line 361, File PyDbCurve.cpp:

BricsCAD is also missing a bunch of geometry classes I.e. AcGeBoundBlock2d
probably get the object’s bounding box for min max

[schoeller]

Could also not make it work like this:

arc: Cv.CvDbVAlignmentArc = Cv.CvDbVAlignmentArc.cast(element)
cv = Db.Curve.cast(arc).getAcGeCurve()

Posted SR175846. Hm

[schoeller]

            #get the end pointd for this section
            sp2d = parabola.startPoint()
            ep2d = parabola.endPoint()```

This helper function seems to deliver a usable result close to the absolute vertical max of the parabola. Similarly for vertical min.

def getVMaxPoint(valign,spt,ept):
    try:
        no = 100
        coords = []
        sdist = valign.getDistAtPoint(Ge.Point3d(spt.x,spt.y,0))
        edist = valign.getDistAtPoint(Ge.Point3d(ept.x,ept.y,0))
        dist = sdist
        
        while dist < edist:
            pt = valign.getPointAtDist(dist)
            coords.append([pt.x, pt.y])
            dist += (edist-sdist)/no
        x, ymax = max(coords, key=lambda x: (x[1]))
        return Ge.Point3d(x,ymax,0)
    
    except Exception as err:
        traceback.print_exception(err)

[schoeller]

Have this helper function generating a list of 3d Points

def generateCrestGrip(point, scale, elevation):
    try:
        plist = []
        plist.append(Ge.Point3d(point.x, point.y, elevation)) # append bottom point
        plist.append(Ge.Point3d(point.x - 5 * scale, point.y + 5 * scale, elevation)) # append top-left point
        plist.append(Ge.Point3d(point.x + 5 * scale, point.y + 5 * scale, elevation)) # append top-right point
        return plist
    except Exception as err:
        traceback.print_exception(err)

When actually drawing the triangle as per

def annotateRisingCurve(curvedElement, verticalAlignment, verticalAlignmentView):
    try:
        #get the end pointd for this section
        sp2d = curvedElement.startPoint()
        ep2d = curvedElement.endPoint()
        
        #get the vmax point
        vmax = getVMaxPoint(verticalAlignment, sp2d, ep2d)
        
        # transform the point from to WCS
        vmax.x = verticalAlignmentView.toWCSX(vmax.x)
        vmax.y = verticalAlignmentView.toWCSY(vmax.y)
        Ed.Core.grDrawCircle(vmax,1.0,24,1)

        print(generateCrestGrip(vmax, 1, 0))
        # draw crest grip
        Ed.Core.grDrawPoly2d(generateCrestGrip(vmax, 1, 0), 5)

    except Exception as err:
        traceback.print_exception(err)

I receive the error

[<PyGe.Point3d(-0.57088108249762,-18.17892067486769,0.00000000000000)>, <PyGe.Point3d(-5.57088108249762,-13.17892067486769,0.00000000000000)>, <PyGe.Point3d(4.42911891750238,-13.17892067486769,0.00000000000000)>]
Traceback (most recent call last):
  File "C:\Users\Sebastian Schoeller\Documents\GitHub\PyBrxCv\brxsdk\utils\CvAlignmentAnnotate.py", line 103, in annotateRisingCurve
    Ed.Core.grDrawPoly2d(generateCrestGrip(vmax, 1, 0), 5)
TypeError: No registered converter was able to produce a C++ rvalue of type class AcGePoint2d from this Python object of type Point3d

Hints appreciated

[schoeller]

When passing a list of Ge.Point2d it works.

[CEXT-Dan]

I think I just had the incorrect stub, I’ll fix this
grDrawPoly2d should work with 2d points
grDrawPoly3d should work with 3d points

        p2d = [Ge.Point2d(100,100),Ge.Point2d(200,100),Ge.Point2d(200,200)]
        p3d = [Ge.Point3d(0,0,0),Ge.Point3d(100,0,0),Ge.Point3d(100,100,0)]
        Ed.Core.grDrawPoly2d(p2d,2)
        Ed.Core.grDrawPoly3d(p3d,3)

[CEXT-Dan]

Also, you may have to add the closing point

[schoeller]

Advancing slightly. How would one read the current annotation scale?

[schoeller]

I run into trouble with ep2d = curvedElement.endPoint() called on an element from a vertical aligment. Manually pickes values do not seem to match. Gist is available for CvAlignmentAnnotate.py.

[schoeller]

0#1#Manual pick startpoint

1#Manual pick endpoint

2#2d coordinates from element

3#2d coordinates after convert to WCS

4#plausability check: BCAD read on element IN/OUT

5#comparing values to script results

=> sdist = IN
=> edist != OUT

edist seems to be mid-distance between.

vAlign_1.zip

[schoeller]

Sorry to have bothered. The Gin in my tonic blindfolded me:

def getVMidPoint(valign,spt,ept):
    try:
        sdist = valign.getDistAtPoint(Ge.Point3d(spt.x,spt.y,0))
        edist = valign.getDistAtPoint(Ge.Point3d(ept.x,ept.y,0))
        pt = valign.getPointAtDist(((edist-sdist)/2)+sdist)
        return pt

Looks clean now:

[schoeller]

How would I write a text label with position and size? An example using grText or similar is appreciated

[CEXT-Dan]

GrText won’t work for this.

There’s another way to draw temporary graphics using Gi.TransientManager
See if this will work for you

import traceback
from pyrx_imp import Rx, Ge, Db, Ap, Ed, Gi

vpids = []
markers = []
        
def clear():
    tm = Gi.TransientManager.current()
    for marker in markers:
        tm.eraseTransient(marker,vpids)
    vpids.clear()
    markers.clear()
    try:
        Ed.Core.vportTableRecords2Vports()
    except:
        pass
    
def PyRxCmd_clearit():
     clear()
        
def PyRxCmd_doit():
    try:    
        clear()
        #what viewport
        vpids.append(Ed.Core.getVar("CVPORT"))
        
        line = Db.Line(Ge.Point3d(0,0,0),Ge.Point3d(100,100,0))
        line.setDatabaseDefaults()
        line.setColorIndex(1)
        
        mt = Db.MText()
        mt.setDatabaseDefaults()
        mt.setContents("Hello World: ")
        mt.setDirection(Ge.Point3d(100,100,0)-Ge.Point3d(0,0,0) )
        mt.setLocation(line.midPoint())
        
        markers.append(line)
        markers.append(mt)

        tm = Gi.TransientManager.current()
        for marker in markers:
            tm.addTransient(marker,Gi.TransientDrawingMode.kAcGiDirectShortTerm,128,vpids)
        try:
            Ed.Core.vportTableRecords2Vports()
        except:
            pass

    except Exception as err:
        traceback.print_exception(err)

[schoeller]

Cheers. Works as below. Malheuresement the entities drawn previously through Ed.Core are gone.
Without knowing anything about this topic I guess that it's due to some pieces being manager (TransientManager) and some not.

What I would like to achieve is to script an annotation style, which whenever I am happy with it (one hopefully not so distant day) may be enabled/disabled and also is rewritten once the vertical alignment view is moved/altered/erased etc. Am willing to read up on things and to study further.

[CEXT-Dan]

The TransientManager probably causes a redraw, you may have to do GrDraw after.
Lee managed to GrDraw text in lisp here, https://lee-mac.com/grtext.html
I’ll have to have a peek to see how he did it

[schoeller]

If understood correctly all entities drawn through Db may be attached to the TransientManager, which in effect carries an index of the entity (the marker list in this case), thus allow to delete specific one and rewrite (for example text size) (a#). All entities from GrDraw are a fire and forget with lower overhead (b#). If this is the case I might as well go (a#) through the code adding Db entities to the list markers and clear all markers and redraw in main.

[schoeller]

Oh in addition to that I noticed that entities are not visible in paper space for printing. That's a bummer!

[CEXT-Dan]

Right, I noticed BricsCAD erases temporaries when switching tabs
AutoCAD doesn’t, I don’t think you will be able to plot temporaries with either.

I’m actually not that familiar with TransientManager, just enough to write tests.
I think I have more to do, .NET has a ‘Transient’ object
https://www.keanw.com/2012/09/creating-reactive-transient-autocad-geometry-using-net.html

maybe there’s a way to update the temporaries for plotting

[schoeller]

Maybe I could create primitives as recommended and group them, so that they stay manageable within the drawing. This would I avoid all this trouble with visibility in vports + printability. One may shift/edit single labels etc.

On change of parts of the vertical alignment view one could then delete the group and redraw. If only moved, one should move the group if lighter to processing demands. Am new to all of this and maybe it's too much, but still fun. Have tried so far overrule => changing appearance of the object not suitable for this purpose.

How would I attach the group handle and OnChange of vertical alignment view delete/redraw that group? Hints appreciated.

[schoeller]

How would I attach the group handle and OnChange of vertical alignment view delete/redraw that group? Hints appreciated.

I am happy with the current solution which is using grouping only.

[CEXT-Dan]

Sorry, I missed the event part, I think a Persistent Reactor might work, though I have not tried it yet

[schoeller]

Sorry, I missed the event part, I think a Persistent Reactor might work, though I have not tried it yet

ok, will study the example.

[schoeller]

Have assemblied a command CVGetDemTin.py. How would one use crossingsElevation in order not to allow crossings?

[CEXT-Dan]

Is it a Enum error? I had a note, because there was a naming conflict TinIntersectionElevation, I renamed one to
BreaklineIntersectionElevation

[CEXT-Dan]

Also, about the eWasOpenForWrite error
The goal should be to minimize the time objects are opened for write, otherwise well, you see what can happen

Db.addToModelspace;

is a convenience method and is exactly the same as

model` = Db.BlockTableRecord(db.modelSpaceId(), Db.OpenMode.kForWrite)
model.appendAcDbEntity()

except that Db.addToModelspace closes modelspace right away whereas the former keeps modelspace opened for write for the whole function
also

geoData = Db.GeoData(geoDataId, Db.OpenMode.kForWrite)

is write, where I think it only need to be for read.

[schoeller]

Thanks for the input. Comments much appreciated for learning curve. breakline.setIntersectionElevation(Cv.TinIntersectionElevation.eTinNotAllowed) seems to work.

[CEXT-Dan]

FYI, this is named to BreaklineIntersectionElevation for the next release since there was a name conflict

[schoeller]

I am trying to place orthogonal lines (or lateron sections) for a defined halignment + station. In my youthful ignorance I had thought to be able to cast a curve from an element containing the station and then identify somehow the normal to that. Unfortunately I got directly stuck in the beginning.

Ideas welcome

Zeichnung1_.zip

[schoeller]

Have found a workaround getting the vector between two points + the norm.