/data/refman/pasoursint/CMSSW_6_1_1/src/Geometry/TrackerGeometryBuilder/src/PixelTopologyBuilder.cc

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// Make the change for "big" pixels. 3/06 d.k.
#include "Geometry/TrackerGeometryBuilder/interface/PixelTopologyBuilder.h"
#include "Geometry/TrackerGeometryBuilder/interface/RectangularPixelTopology.h"
#include "DataFormats/GeometrySurface/interface/Bounds.h"

PixelTopologyBuilder::PixelTopologyBuilder( void )
{}

PixelTopology*
PixelTopologyBuilder::build( const Bounds* bs, 
                             bool upgradeGeometry,
                             int pixelROCRows, // Num of Rows per ROC
                             int pixelROCCols, // Num of Cols per ROC
                             int BIG_PIX_PER_ROC_X, // in x direction, rows. BIG_PIX_PER_ROC_X = 0 for SLHC
                             int BIG_PIX_PER_ROC_Y, // in y direction, cols. BIG_PIX_PER_ROC_Y = 0 for SLHC
                             int pixelROCsInX, int pixelROCsInY )
{
  float width = bs->width();   // module width = Xsize
  float length = bs->length(); // module length = Ysize

  // Number of pixel rows (x) and columns (y) per module
  int nrows = pixelROCRows * pixelROCsInX;
  int ncols = pixelROCCols * pixelROCsInY;

  // Take into account the large edge pixles
  // 1 big pixel per ROC
  float pitchX = width /(nrows+pixelROCsInX*BIG_PIX_PER_ROC_X); 
  // 2 big pixels per ROC
  float pitchY = length/(ncols+pixelROCsInY*BIG_PIX_PER_ROC_Y);

  return ( new RectangularPixelTopology( nrows, ncols, pitchX, pitchY,
                                         upgradeGeometry,
                                         pixelROCRows, // (int)rocRow
                                         pixelROCCols, // (int)rocCol
                                         BIG_PIX_PER_ROC_X,
                                         BIG_PIX_PER_ROC_Y,
                                         pixelROCsInX, pixelROCsInY )); // (int)rocInX, (int)rocInY
}