[OpendTect_Developers] Horizon Z transformer class

[Ranojay Sen]

Dear All,

     While working with some flattening mechanism, I had to add a  
EM::HorizonZTransformer class  in EarthModel which can flatten/unflatten 
horizons based on a reference horizon and creates a new output horizon 
with flattened z values. It is an executor,  and for every BinID it uses 
z value of reference horizon and target horizon and calculates the new 
flattened z value, and puts it to the new horizon. I have made a sample 
program with a simple UI for reading the reference, target  and  output 
horizons and do the processing in the accecptOK function. I will explain 
a part of the code here the rest of the code will be in the  attached files.

EM::Horizon* uiHorizonTransformer::getHorizon( const IOObj& ioobj ) // 
simple function to read horizon objects
{}

#define mGetHor( hornm, fld )   // macro defined in the file

bool uiHorizonTransformer::acceptOK( CallBacker* )
{
     EM::Horizon* hor;
     const IOObj* ioobj;
     mGetHor( refhor, refhorizonfld_ );  // call the function with the 
macro and load the horizon.
     mGetHor( tarhor, tarhorizonfld_ );
     mGetHor( newhor, outputhorizonfld_ );


     const StepInterval<int> inlrg = refhor->geometry().rowRange();
     const StepInterval<int> crlrg = refhor->geometry().colRange();

     newhor->ref();
     newhor->geometry().removeAll();
     newhor->enableGeometryChecks( false );
     const RowCol step( inlrg.step, crlrg.step );
     newhor->geometry().setStep( step, step );
     newhor->geometry().addSection( "", false ); // clear all the 
geometries of the new horizon and initialise as an empty horizon

     EM::HorizonZTransform* transform = new EM::HorizonZTransform;
     transform->setHorizon( *refhor ); // create a Horizon transfrom 
from from the refhor

     EM::HorizonZTransformer transformer( *transform, *tarhor,  true ); 
//This is the transformer object with its parameters last parameter 
true/false for flattening/unflattening
     transformer.setOutputHorizon( *newhor ); // sets the output horizon
     uiTaskRunner tr( this );

     if ( !tr.execute( transformer ) )
     return false;

     PtrMan<Executor> saver = newhor->saver(); // once the execution 
succeeds .. save it
     return tr.execute( *saver.ptr() );
}


This was just a simple description for using this class. The source 
codes can be compiled and run just to see how it works.

Regards
Ranojay

-- 
Ranojay Sen
dGB Earth Sciences - India
304, Gateway Plaza
Hiranandani Gardens, Powai
Mumbai-400076
India
http://www.dgbes.com http://www.opendtect.org
Phone: +91 22 25704984

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