【转帖】oddbspatialfilterboundary
 

oddbspatialfilter::boundary
oddbspatialfilter::boundary
i tried to read spatial filters from a dwg file.
(i use dd 1.13.02.)
here a drawing with two xclip blocks.
it copied and was made two.
oddbspatialfilterptr pfilt = oddbindexfiltermanager::getfilter( pblk, oddbspatialfilter::desc(), oddb::kforread );
odgepoint2darray points;
pfilt->boundary( points );
it becomes the value with two same.
points = (55, 55), (145,145)
the value of the 2nd block is different.
please teach me how to calculate.
attached files
hi,
here is how to calculate boundary in wcs:
oddbspatialfilterptr pfilt = oddbindexfiltermanager::getfilter( pblk, oddbspatialfilter::desc(), oddb::kforread );
odgiclipboundary def;
pfilt->getdefinition(def);
oduint32 i;
odgematrix3d toworld = pblk->blocktransform() * def.m_xinverseblockrefxform * def.m_xtoclipspace.inverse();
odgepoint3darray boundary;
if(def.m_points.size() > 2)
{
// polygonal border
boundary.resize(def.m_points.size()+1);
for(i = 0; i < def.m_points.size(); i ++)
{
boundary[i].x = def.m_points[i].x;
boundary[i].y = def.m_points[i].y;
boundary[i].z = 0.0;
boundary[i].transformby(toworld);
}
boundary[i].x = def.m_points[0].x;
boundary[i].y = def.m_points[0].y;
boundary[i].z = 0.0;
boundary[i].transformby(toworld);
}
else
{
// rectangular border
boundary.resize(5);
boundary[0].x = def.m_points[0].x;
boundary[0].y = def.m_points[0].y;
boundary[1].x = def.m_points[0].x;
boundary[1].y = def.m_points[1].y;
boundary[2].x = def.m_points[1].x;
boundary[2].y = def.m_points[1].y;
boundary[3].x = def.m_points[1].x;
boundary[3].y = def.m_points[0].y;
boundary[4].x = def.m_points[0].x;
boundary[4].y = def.m_points[0].y;
for(i = 0; i < 5; i ++)
{
boundary[i].z = 0.0;
boundary[i].transformby(toworld);
}
}
last edited by dmitry a. novikov; 16th september 2005 at 05:54 amfff">.
thank you for reply.
simple dwg(base.dwg) is ok.
but it shifts, when this drawing(026.dwg).
in for example, the case of the 1st point
before transform : 12710.29, -33954.25
after transform : 1673419.98, 474983.33
both have shifted.
please teach me how to calculate.
attached files (85.3 kb, 8 views)

hi,
i forgot to take block record's origin into account.
oddbspatialfilterptr pfilt = oddbindexfiltermanager::getfilter( pblk, oddbspatialfilter::desc(), oddb::kforread );
odgiclipboundary def;
pfilt->getdefinition(def);
oduint32 i;
oddbblocktablerecordptr pblockrecord = pblk->blocktablerecord().safeopenobject();
odgematrix3d toworld = pblk->blocktransform() *
odgematrix3d::translation(odgepoint3d::korigin - pblockrecord->origin()) *
def.m_xinverseblockrefxform * def.m_xtoclipspace.inverse();
...
great!
calculably.
it succeeded in the clipping of the block.
thank you very much.