Hello.
I have a file with a series of points. I'm trying to trace a line adding these
points in different moments (calling the method "addPointToLine(Pnt3f point)").
If I add some points in the constructor (and only there), the line is drawn. If
I add the points in another method, I can't understand why my code doesn't
work...
//I USE THESE PROPERTIES:
GeometryPtr mGeometricData;
NodePtr mGeometricNode;
GeoPLengthsPtr mLengths;
GeoPositions3fPtr mPositions;
GeoIndicesUI32Ptr mIndices;
int mNumPoints;
//THIS IS PART OF THE
CONSTRUCTOR:*******************************************************************************************************
//...
mGeometricNode = Node::create();
if (mGeometricNode == NullFC) {
throw DllException::createDllException("ERROR: cannot
create geometry core");
}
//Create a geometry core
mGeometricData = Geometry::create();
if (mGeometricData == NullFC) {
throw DllException::createDllException("ERROR: cannot
create geometry core");
}
//set the geometric core
beginEditCP(mGeometricNode, Node::CoreFieldMask);
mGeometricNode->setCore(mGeometricData);
endEditCP(mGeometricNode, Node::CoreFieldMask);
//Now we must fill the geometry
//Here we define the type of primitive we will use
GeoPTypesPtr type = GeoPTypesUI8::create();
beginEditCP(type,GeoPTypesUI8::GeoPropDataFieldMask);
type->addValue(GL_LINES);
endEditCP(type,GeoPTypesUI8::GeoPropDataFieldMask);
//Here we set the total number of vertices to be drawn
mLengths = GeoPLengthsUI32::create();
//Create the list of vertices
mPositions = GeoPositions3f::create();
//Create list of indices
mIndices = GeoIndicesUI32::create();
//Now we fill the geometric core with all this stuff
beginEditCP(mGeometricData, Geometry::TypesFieldMask
|
Geometry::LengthsFieldMask
|
Geometry::PositionsFieldMask
|
Geometry::IndicesFieldMask
|
Geometry::MaterialFieldMask);
mGeometricData->setTypes(type);
mGeometricData->setLengths(mLengths);
mGeometricData->setPositions(mPositions);
mGeometricData->setIndices(mIndices);
mGeometricData->setMaterial(getDefaultMaterial());
endEditCP(mGeometricData, Geometry::TypesFieldMask
|
Geometry::LengthsFieldMask
|
Geometry::PositionsFieldMask
|
Geometry::IndicesFieldMask
|
Geometry::MaterialFieldMask);
//disable rendering till we have at least 2 points
beginEditCP(mGeometricNode);
mGeometricNode->setActive(false);
endEditCP(mGeometricNode);
//no points at first
mNumPoints=0;
//...
//THIS IS THE METHOD CALLED TO ADD A POINT TO THE
LINE************************************************************************************
addPointToLine(Pnt3f point)
{
//Increase num of points
mNumPoints++;
//Update size
beginEditCP(mLengths, GeoPLengthsUI32::GeoPropDataFieldMask);
if (mNumPoints > 1)
{
mLengths->setValue((mNumPoints-1)*2,0);
}
else
{
mLengths->addValue((mNumPoints-1)*2);
}
endEditCP(mLengths, GeoPLengthsUI32::GeoPropDataFieldMask);
//Add given point to vertices
beginEditCP(mPositions, GeoPositions3f::GeoPropDataFieldMask);
mPositions->addValue(point);
endEditCP(mPositions, GeoPositions3f::GeoPropDataFieldMask);
//check if we have at least two points
if (mNumPoints > 1)
{
beginEditCP(mIndices, GeoIndicesUI32::GeoPropDataFieldMask);
mIndices->addValue(mNumPoints-2);
mIndices->addValue(mNumPoints-1);
endEditCP(mIndices, GeoIndicesUI32::GeoPropDataFieldMask);
//set the node active
beginEditCP(mGeometricNode);
mGeometricNode->setActive(true);
endEditCP(mGeometricNode);
}
}
Every time I call "mLengths->setValue((mNumPoints-1)*2,0);" the application
crashes with a memory error.
It seems that mLengths points to NULL...
Could anyone help me?
Thanks,
Antonio
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