//---------------------------------------------------------
bool CShapes_Buffer::Get_Buffers(CSG_Shapes *pShapes, int Field, CSG_Shapes *pBuffers, double Scale, bool bDissolve)
{
//-----------------------------------------------------
double Distance;
CSG_Shapes Part(SHAPE_TYPE_Polygon);
CSG_Shape *pPart = Part.Add_Shape(), *pBuffer;
Distance = Parameters("DIST_FIELD")->asDouble() * Scale;
Scale = Parameters("DIST_SCALE")->asDouble() * Scale;
if( !bDissolve )
{
pBuffers->Create(SHAPE_TYPE_Polygon, CSG_String::Format(SG_T("%s [%s]"), pShapes->Get_Name(), _TL("Buffer")), pShapes);
}
else
{
pBuffers->Create(SHAPE_TYPE_Polygon, CSG_String::Format(SG_T("%s [%s]"), pShapes->Get_Name(), _TL("Buffer")));
pBuffers->Add_Field(_TL("ID"), SG_DATATYPE_Int);
pBuffer = pBuffers->Add_Shape();
}
//-----------------------------------------------------
for(int iShape=0; iShape<pShapes->Get_Count() && Set_Progress(iShape, pShapes->Get_Count()); iShape++)
{
CSG_Shape *pShape = pShapes->Get_Shape(iShape);
if( Field < 0 || (Distance = Scale * pShape->asDouble(Field)) > 0.0 )
{
if( !bDissolve )
{
pBuffer = pBuffers->Add_Shape(pShape, SHAPE_COPY_ATTR);
}
if( pBuffer->Get_Part_Count() == 0 )
{
Get_Buffer(pShape, pBuffer, Distance);
}
else
{
Get_Buffer(pShape, pPart , Distance);
SG_Polygon_Union(pBuffer, pPart);
pPart->Del_Parts();
}
}
}
//-----------------------------------------------------
return( pBuffers->is_Valid() );
}
/*
* Get a buffer for given filesystem block.
*/
int Get_FS_Buffer(struct FS_Buffer_Cache *cache, ulong_t fsBlockNum,
struct FS_Buffer **pBuf) {
int rc;
Mutex_Lock(&cache->lock);
rc = Get_Buffer(cache, fsBlockNum, pBuf);
Mutex_Unlock(&cache->lock);
return rc;
}
