Topic: length of spline!

[web.pawan]

For finding spline length using autolisp, i use

Code: [Select]

(command "spline" pt1 pt2 pt3 pt4  "" pt1 pt4)
(setq ent1(entlast))
(setq lengthOfSpline(vlax-curve-getDistAtParam ent1 (vlax-curve-getEndParam ent1)))
how to do the same in C++?

Code: [Select]

//this doesn't give right value
ptArray contains pt1, pt2, pt3, pt4
for( int i = 0 ; i < 4; i++ )
  vertices.append(asPnt3d( ptArray[i]));
 
    AcDbSpline* spline = new AcDbSpline(vertices, startTangent, endTangent );
double dummy1=0, dummy2=0;
int retVal;
retVal = spline->getEndParam(dummy1);
retVal = spline->getDistAtParam(dummy1,dummy2);
delete spline;
return dummy2;

//i think this is not right as the outputs are different.

//any other way to find it? is there a direct call like object.length() to find out?Thanks,
Pawan.

[It's Alive!]

That's right, those both give the same length;

Code: [Select]

  static void ExtTools_doit(void)
  {
    CPromptEntityResultPtr pRes = CEditor::GetEntity(_T("\nSelect Spline: "));
    if(pRes->Status != Acad::eNormal){
      return;
    }

    AcDbEntityPointer pEnt(pRes->ObjectId,AcDb::kForRead);
    if(pEnt.openStatus() != eOk){
      return;
    }

    AcDbSpline *pSpline = AcDbSpline::cast(pEnt);
    if(pSpline == NULL){
      return;
    }

    double endParam,length;
    pSpline->getEndParam(endParam);
    pSpline->getDistAtParam(endParam,length);

    acutPrintf(_T("\nSpline Length is %g"),length);
  }


[web.pawan]

  Thank you, but i could not verify

Code: [Select]

CPromptEntityResultPtr pRes = CEditor::GetEntity(_T("\nSelect Spline: "));
if(pRes->Status != Acad::eNormal){
  return;
}

what's the equivalent in autocad 2009. I couldn't locate this class in object arx 2009.

[It's Alive!]

Sorry, that's from my own class. try this

Code: [Select]

  static void ExtTools_doit(void)
  {
    ads_name ename = { 0L , 0L };
    ads_point pnt  = {0.0, 0.0, 0.0};
    AcDbObjectId eId;

    if(acedEntSel(_T("\nSelect Spline: "),ename,pnt) == RTNORM){
      acdbGetObjectId(eId,ename);
    }

    AcDbEntityPointer pEnt(eId, AcDb::kForRead);
    if(pEnt.openStatus() != eOk){
      return;
    }

    AcDbSpline *pSpline = AcDbSpline::cast(pEnt);
    if(pSpline == NULL){
      return;
    }

    double endParam,length;
    pSpline->getEndParam(endParam);
    pSpline->getDistAtParam(endParam,length);

    acutPrintf(_T("\nSpline Length is %g"),length);
  }


[web.pawan]

  Thank you!
You are very good at ARX!

[It's Alive!]

Thank you!

It's my pleasure.

You are very good at ARX!

Thanks! I feel I'm just a newbie with ARX..... I want to be like Owen when I grow up