Hello,
I'm having trouble with drawing a line.
A little background. I have a graph with vertices and edges represented in the
boost graph library. I am using boost to find some coordinates for me to layout
the graph graphically. For each vertex I then draw a model at its location. For
each edge I then attempt to draw a line between the locations of the models.
Problem is that doesn't work. The lines go from the origin to the vertices. It
does not go from vertex to vertex. Now some code:
Code:
for ( ; it != end ; ++it ) {
VertexID id = *it ;
Vertex* vertex = &(*ng)[id] ;
osg::ref_ptr<osg::Node> cModel =
(osg::Node*)model->clone(osg::CopyOp::DEEP_COPY_NODES ) ;
printf( "%d, x=%f, y=%f, z=%f\n", id, vertex->point[0], 0.0f, vertex->point[1]
) ;
osg::ref_ptr<osg::PositionAttitudeTransform> transform = new
osg::PositionAttitudeTransform( ) ;
transform->setPosition( osg::Vec3f( vertex->point[0], 0.0f, vertex->point[1] )
) ;
transform->addChild( cModel ) ;
root->addChild( transform ) ;
}
boost::tie( eit, eend ) = edges(*ng) ;
for( ; eit != eend ; ++eit ) {
EdgeID ide = *eit ;
Edge& edge = (*ng)[ide] ;
VertexID srcId = source( ide, *ng ) ;
VertexID dstId = target( ide, *ng ) ;
Vertex* src = &(*ng)[srcId] ;
Vertex* dst = &(*ng)[dstId] ;
printf( "%d, x=%f, y=%f, z=%f\n", dstId, dst->point[0], 0.0f, dst->point[1] ) ;
printf( "%d, x=%f, y=%f, z=%f\n", srcId, src->point[0], 0.0f, src->point[1] ) ;
osg::Geometry* lg = new osg::Geometry( ) ;
osg::Vec3Array* vs = new osg::Vec3Array( ) ;
vs->push_back( osg::Vec3f( src->point[0], 0.0f, src->point[1] ) ) ;
vs->push_back( osg::Vec3f( dst->point[0], 0.0f, dst->point[1] ) ) ;
lg->setVertexArray( vs );
osg::ref_ptr<osg::DrawArrays> da = new osg::DrawArrays(
osg::PrimitiveSet::LINES, 1, 2 ) ;
lg->addPrimitiveSet( da ) ;
osg::ref_ptr<osg::Geode> lgeode = new osg::Geode( ) ;
lgeode->addDrawable( lg ) ;
root->addChild( lgeode ) ;
}
Now consider these two vertices:
0, x=10.000000, y=0.000000, z=0.000000
1, x=9.510565, y=0.000000, z=3.090170
I add the model at each of them with a transform and then I draw a line from
one point to another. No translations are done as seen in the code above.
So, what am I doing wrong? Do I need to draw a line and then translate it?
Thanks!
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=43477#43477
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