Changeset 2630 for trunk/src

Timestamp:

08/07/12 18:18:26 (12 years ago)

Author:

Takeshi Nakazato

Message:

New Development: No

JIRA Issue: No

Ready for Test: Yes

Interface Changes: No

What Interface Changed: Please list interface changes

Test Programs: test_sdgrid

Put in Release Notes: No

Module(s): Module Names change impacts.

Description: Describe your changes here...

Minor speedup

File:

• trunk/src/STGrid.cpp (modified) (3 diffs)

trunk/src/STGrid.cpp

@@ -1084 +1084 @@
 //   os << "xmin=" << xmin << LogIO::POST ;
 //   os << "center_=" << center_ << LogIO::POST ;
-
+  decCorr_ = 1.0 / cos( center_[1] ) ;
 
   nx_ = nx ;
@@ -1143 +1143 @@
   cellx_ = qcellx.getValue( "rad" ) ;
   // DEC correction
-  cellx_ /= cos( center_[1] ) ;
+  cellx_ *= decCorr_ ;
   celly_ = qcelly.getValue( "rad" ) ;
   //os << "cellx_=" << cellx_ << ", celly_=" << celly_ << ", cos("<<center_(1)<<")=" << cos(center_(1)) << LogIO::POST ;
@@ -1541 +1541 @@
   Double *wp_p = p_p ;
   for ( uInt i = 0 ; i < nrow ; i++ ) {
-    *wp_p = pixc[0] + ( *ww_p - center_[0] ) / cos( center_[1] ) / cellx_ ;
+    *wp_p = pixc[0] + ( *ww_p - center_[0] ) * decCorr_ / cellx_ ;
     wp_p++ ;
     ww_p++ ;