Can anyone offset a line??? Please help a beginner!

[Anonymous]

hello,

I'm new to objectarx, and and have a little
problem:

I try to offset a AcDbLine.

First I create a line, after this I want to
offset this line in objectarx about 10cm to the right,
like the command
'offset' in autocad do.

How do I figure out the new points of the new
line?
The code below, that's how far I came.
Is that the the right way or
is there a better way of doing this?

thanks for help

chris

ads_point pt1, pt2;
int
retval;
Acad::ErrorStatus es;

try
 {
 // get the first point
from the user.  Do not specify a base point.
 //...
 if
((retval = acedGetPoint(NULL, LoadMyResourceString(IDS_STRING101), pt1)) !=
RTNORM)
  throw retval;
 // get the second point from the
user, using the first point as a base point.
 //...
 if ((retval
= acedGetPoint(pt1, LoadMyResourceString(IDS_STRING102), pt2)) !=
RTNORM)
  throw retval;
 }
catch (int
e)
 {
 if (e == RTCAN)
  return
Acad::eUserBreak;
 if (e == RTERROR)
  return
Acad::eInvalidInput;
 }

// Instantiate an AcDbLine pointer.  Use the
two user-chosen
// points as endpoints.
// Since AcDbLine's constructor
uses AcGePoint2d, but acedGetPoint returns ads_point,
// you must find a way
to translate old style to new style.  This can be done either by
//
assigning each array member individually, or by calling asPnt3d() from
geassign.h

AcDbLine* pLine = new AcDbLine(asPnt3d(pt1),
asPnt3d(pt2));
// Make sure you created the line...
if
(!pLine)
 {
 acedAlert(LoadMyResourceString(IDS_STRING103));
 return
Acad::eOutOfMemory;
 }
// change the color property of the new line
to this value.
int color = 2;
pLine->setColorIndex(color);

// Post the new entity to the
database
AcDbObjectId id;
postToDb(pLine, id);

pLine->close();

//Get the new coordinates of the new
points
AcGeMatrix3d xform;
AcDbEntity* pEnt;
AcGeVector3d
axis;

if (acdbOpenObject(pEnt, id, AcDb::kForRead) !=
Acad::eOk)
 {
 id->close();
    return
Acad::eNullEntityPointer;
 }
id->close();

AcGeMatrix3d
ecsMat;
pEnt->getEcs(ecsMat);
AcGePoint3d origin;
AcGeVector3d
xAxis;
AcGeVector3d yAxis;
ecsMat.getCoordSystem(origin, xAxis, yAxis,
axis);

xform.setToRotation(-90.0, axis, ucsToWcs(asPnt3d(pt1)));
es =
pEnt->upgradeOpen();
 if (es ==
Acad::eOk)
  {
  es =
pEnt->transformBy(xform);
  if (es !=
Acad::eOk)
    return Acad::eNotApplicable;

  }
pEnt->close();

[Anonymous]

How about this (just add error checking...):

Once you have created the line, let AutoCAD do the work for you!

{...}
double dist = 10.0;
AcDbVoidPtrArray ents;
pLine->getOffsetCurves(dist, ents);

// There should only be one, but call me superstitious...
for (int i=0; i < ents.length(); i++)
{
AcDbEntity *pEnt = ((AcRxObject*)(ents));
if (i=0)
{
postToDb(pEnt, id);
pEnt->close();
}
else
delete pEnt;
}
{...}

"C. Marx" wrote in message
news:[email protected]...
hello,

I'm new to objectarx, and and have a little problem:

I try to offset a AcDbLine.
First I create a line, after this I want to offset this line in objectarx
about 10cm to the right,
like the command 'offset' in autocad do.
How do I figure out the new points of the new line?
The code below, that's how far I came.
Is that the the right way or is there a better way of doing this?

thanks for help

chris



ads_point pt1, pt2;
int retval;
Acad::ErrorStatus es;

try
{
// get the first point from the user. Do not specify a base point.
//...
if ((retval = acedGetPoint(NULL, LoadMyResourceString(IDS_STRING101), pt1))
!= RTNORM)
throw retval;
// get the second point from the user, using the first point as a base
point.
//...
if ((retval = acedGetPoint(pt1, LoadMyResourceString(IDS_STRING102), pt2))
!= RTNORM)
throw retval;
}
catch (int e)
{
if (e == RTCAN)
return Acad::eUserBreak;
if (e == RTERROR)
return Acad::eInvalidInput;
}

// Instantiate an AcDbLine pointer. Use the two user-chosen
// points as endpoints.
// Since AcDbLine's constructor uses AcGePoint2d, but acedGetPoint returns
ads_point,
// you must find a way to translate old style to new style. This can be
done either by
// assigning each array member individually, or by calling asPnt3d() from
geassign.h

AcDbLine* pLine = new AcDbLine(asPnt3d(pt1), asPnt3d(pt2));
// Make sure you created the line...
if (!pLine)
{
acedAlert(LoadMyResourceString(IDS_STRING103));
return Acad::eOutOfMemory;
}
// change the color property of the new line to this value.
int color = 2;
pLine->setColorIndex(color);

// Post the new entity to the database
AcDbObjectId id;
postToDb(pLine, id);

pLine->close();

//Get the new coordinates of the new points
AcGeMatrix3d xform;
AcDbEntity* pEnt;
AcGeVector3d axis;

if (acdbOpenObject(pEnt, id, AcDb::kForRead) != Acad::eOk)
{
id->close();
return Acad::eNullEntityPointer;
}
id->close();

AcGeMatrix3d ecsMat;
pEnt->getEcs(ecsMat);
AcGePoint3d origin;
AcGeVector3d xAxis;
AcGeVector3d yAxis;
ecsMat.getCoordSystem(origin, xAxis, yAxis, axis);


xform.setToRotation(-90.0, axis, ucsToWcs(asPnt3d(pt1)));
es = pEnt->upgradeOpen();
if (es == Acad::eOk)
{
es = pEnt->transformBy(xform);
if (es != Acad::eOk)
return Acad::eNotApplicable;

}
pEnt->close();

[Anonymous]

Ack! That's terrible....I should be shot.

the first line of the for loop should look like this:
AcDbEntity *pEnt = ((AcDbEntity*)(ents));

Hopefully that is safe 😉 If you're superstitious, you may want to use
this instead
AcDbEntity *pEnt = AcDbEntity::cast((AcRxObject*)(ents));

and then verify that pEnt != NULL before you use it.


Jon

[Anonymous]

Thanks for answering me!

I check it out and tell you if I succeed.

Chris

[Anonymous]

Okay, this solution is not ARX, but ads. However, it's simple. Try to run
acedCommand() with appropriate string parameters. That should do the trick.
C. Marx wrote in message
news:[email protected]...
hello,

I'm new to objectarx, and and have a little problem:

I try to offset a AcDbLine.
First I create a line, after this I want to offset this line in objectarx
about 10cm to the right,
like the command 'offset' in autocad do.
How do I figure out the new points of the new line?
The code below, that's how far I came.
Is that the the right way or is there a better way of doing this?

thanks for help

chris



ads_point pt1, pt2;
int retval;
Acad::ErrorStatus es;

try
{
// get the first point from the user. Do not specify a base point.
//...
if ((retval = acedGetPoint(NULL, LoadMyResourceString(IDS_STRING101), pt1))
!= RTNORM)
throw retval;
// get the second point from the user, using the first point as a base
point.
//...
if ((retval = acedGetPoint(pt1, LoadMyResourceString(IDS_STRING102), pt2))
!= RTNORM)
throw retval;
}
catch (int e)
{
if (e == RTCAN)
return Acad::eUserBreak;
if (e == RTERROR)
return Acad::eInvalidInput;
}

// Instantiate an AcDbLine pointer. Use the two user-chosen
// points as endpoints.
// Since AcDbLine's constructor uses AcGePoint2d, but acedGetPoint returns
ads_point,
// you must find a way to translate old style to new style. This can be
done either by
// assigning each array member individually, or by calling asPnt3d() from
geassign.h

AcDbLine* pLine = new AcDbLine(asPnt3d(pt1), asPnt3d(pt2));
// Make sure you created the line...
if (!pLine)
{
acedAlert(LoadMyResourceString(IDS_STRING103));
return Acad::eOutOfMemory;
}
// change the color property of the new line to this value.
int color = 2;
pLine->setColorIndex(color);

// Post the new entity to the database
AcDbObjectId id;
postToDb(pLine, id);

pLine->close();

//Get the new coordinates of the new points
AcGeMatrix3d xform;
AcDbEntity* pEnt;
AcGeVector3d axis;

if (acdbOpenObject(pEnt, id, AcDb::kForRead) != Acad::eOk)
{
id->close();
return Acad::eNullEntityPointer;
}
id->close();

AcGeMatrix3d ecsMat;
pEnt->getEcs(ecsMat);
AcGePoint3d origin;
AcGeVector3d xAxis;
AcGeVector3d yAxis;
ecsMat.getCoordSystem(origin, xAxis, yAxis, axis);


xform.setToRotation(-90.0, axis, ucsToWcs(asPnt3d(pt1)));
es = pEnt->upgradeOpen();
if (es == Acad::eOk)
{
es = pEnt->transformBy(xform);
if (es != Acad::eOk)
return Acad::eNotApplicable;

}
pEnt->close();