Fixing reading projections when opening project file.

1) Default project projections is now set from XML only, and does not get
   reset from any layers added.
2) Raster layers get the source SRS from XML only, and does not read the
   GDAL view of projection.
Also added som debug outputs


git-svn-id: http://svn.osgeo.org/qgis/branches/Release-0_8_0@6363 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: homann

src/gui/qgscoordinatetransform.cpp

@@ -119,6 +119,7 @@ void QgsCoordinateTransform::initialise()
     // Pass through with no projection since we have no idea what the layer
     // coordinates are and projecting them may not be appropriate
     mShortCircuit = true;
+    QgsDebugMsg("SourceSRS deemed invalid!");
     return;
   }
 
@@ -130,22 +131,6 @@ void QgsCoordinateTransform::initialise()
     mDestSRS.createFromProj4(mSourceSRS.proj4String());
   }
 
-  //XXX todo overload == operator for QgsSpatialRefSys
-  //at the moment srs.parameters contains the whole proj def...soon it wont...
-  //if (mSourceSRS->proj4String() == mDestSRS->proj4String())
-  if (mSourceSRS == mDestSRS)
-  {
-    // If the source and destination projection are the same, set the short
-    // circuit flag (no transform takes place)
-    mShortCircuit=true;
-    return;
-  }
-  else
-  {
-    // Transform must take place
-    mShortCircuit=false;
-  }
-
   // init the projections (destination and source)
   mDestinationProjection = pj_init_plus(mDestSRS.proj4String());
   mSourceProjection = pj_init_plus(mSourceSRS.proj4String());
@@ -176,6 +161,23 @@ void QgsCoordinateTransform::initialise()
     QgsDebugMsg("------------------------------------------------------------");
   }
 #endif
+
+  //XXX todo overload == operator for QgsSpatialRefSys
+  //at the moment srs.parameters contains the whole proj def...soon it wont...
+  //if (mSourceSRS->proj4String() == mDestSRS->proj4String())
+  if (mSourceSRS == mDestSRS)
+  {
+    // If the source and destination projection are the same, set the short
+    // circuit flag (no transform takes place)
+    mShortCircuit=true;
+    QgsDebugMsg("Source/Dest SRS equal, shortcircuit is set.");
+  }
+  else
+  {
+    // Transform must take place
+    mShortCircuit=false;
+  }
+
 }
 
 //

src/gui/qgsmaplayer.cpp

@@ -260,6 +260,7 @@ bool QgsMapLayer::readXML( QDomNode & layer_node )
     QDomNode srsNode = layer_node.namedItem("coordinatetransform");
     if( ! srsNode.isNull()  )
     {
+      qDebug("Reading coordinatetransform from project file");
        mCoordinateTransform=new QgsCoordinateTransform();
        mCoordinateTransform->readXML(srsNode);
     }
@@ -268,7 +269,7 @@ bool QgsMapLayer::readXML( QDomNode & layer_node )
     QDomNode transparencyNode = layer_node.namedItem("transparencyLevelInt");
     if ( ! transparencyNode.isNull() )
     {
-      // set transparency level only if it's in project
+      // set transparency level only if it's in project 
       // (otherwise it sets the layer transparent)
       QDomElement myElement = transparencyNode.toElement();
       setTransparency(myElement.text().toInt());

src/gui/qgsprojectproperties.cpp

@@ -25,6 +25,7 @@
 #include "qgsmaplayerregistry.h"
 #include "qgsproject.h"
 #include "qgsrenderer.h"
+#include "qgslogger.h"
 
 //qt includes
 #include <QColorDialog>
@@ -61,6 +62,7 @@
   }
   // set the default wkt to WGS 84
   long mySRSID =  QgsProject::instance()->readNumEntry("SpatialRefSys","/ProjectSRSID",GEOSRS_ID);
+  QgsDebugMsg("Read project SRSID: " + QString::number(mySRSID));
   projectionSelector->setSelectedSRSID(mySRSID);
 
 

src/gui/qgsvectorlayer.cpp

@@ -3506,7 +3506,9 @@ void QgsVectorLayer::setCoordinateSystem()
   // project srs
 
   QgsDebugMsg("Layer registry has " + QString::number(QgsMapLayerRegistry::instance()->count()) + " layers ");
-  if (QgsMapLayerRegistry::instance()->count() ==0)
+  // No reason to set project SRS
+  // if (QgsMapLayerRegistry::instance()->count() ==0)
+  if (NULL)
   {
     mCoordinateTransform->destSRS().createFromProj4(
         mCoordinateTransform->sourceSRS().proj4String());

src/raster/qgsrasterlayer.cpp

@@ -491,7 +491,9 @@ void QgsRasterLayer::setupDestSrs()
 {
   QgsDebugMsg("Layer registry has " + QString::number(QgsMapLayerRegistry::instance()->count()) + "layers");
 
-  if (QgsMapLayerRegistry::instance()->count() ==0)
+  // No reason to set project SRS
+  //  if (QgsMapLayerRegistry::instance()->count() ==0)
+  if (NULL)
   {
     mCoordinateTransform->destSRS().createFromProj4(
            mCoordinateTransform->sourceSRS().proj4String());
@@ -551,22 +553,32 @@ QgsRasterLayer::readFile( QString const & fileName )
   QPixmap myPyramidPixmap(myThemePath + "/mIconPyramid.png");
   QPixmap myNoPyramidPixmap(myThemePath + "/mIconNoPyramid.png");
 
-  // Get the layer's projection info and set up the
-  // QgsCoordinateTransform for this layer
-  // NOTE: we must do this before getMetadata is called
-  mCoordinateTransform = new QgsCoordinateTransform();
-  QString mySourceWKT = getProjectionWKT();
 
-  QgsDebugMsg("--------------------------------------------------------------------------------------");
-  QgsDebugMsg("QgsRasterLayer::readFile --- using wkt\n" + mySourceWKT);
-  QgsDebugMsg("--------------------------------------------------------------------------------------");
-
-  mCoordinateTransform->sourceSRS().createFromWkt(mySourceWKT);
-  //get the project projection, defaulting to this layer's projection
-  //if none exists....
-  if (!mCoordinateTransform->sourceSRS().isValid())
+  if (mCoordinateTransform && mCoordinateTransform->sourceSRS().isValid())
+  {
+    // Layer source SRS is already set, probably by reading XML from project file
+    // This setting should override any GDAL info.
+    QgsDebugMsg("Source SRS is alerady set. Ignoring GDAL projection info");
+  }
+  else
   {
-    mCoordinateTransform->sourceSRS().validate();
+    // Get the layer's projection info and set up the
+    // QgsCoordinateTransform for this layer
+    // NOTE: we must do this before getMetadata is called
+    mCoordinateTransform = new QgsCoordinateTransform();
+    QString mySourceWKT = getProjectionWKT();
+
+    QgsDebugMsg("--------------------------------------------------------------------------------------");
+    QgsDebugMsg("QgsRasterLayer::readFile --- using wkt\n" + mySourceWKT);
+    QgsDebugMsg("--------------------------------------------------------------------------------------");
+
+    mCoordinateTransform->sourceSRS().createFromWkt(mySourceWKT);
+    //get the project projection, defaulting to this layer's projection
+    //if none exists....
+    if (!mCoordinateTransform->sourceSRS().isValid())
+    {
+      mCoordinateTransform->sourceSRS().validate();
+    }
   }
 
   setupDestSrs();
@@ -4527,6 +4539,8 @@ bool QgsRasterLayer::readXML_( QDomNode & layer_node )
   QgsDebugMsg("ReadXml: red band name " + redBandNameQString);
   QgsDebugMsg("ReadXml: green band name  " + greenBandNameQString);
   QgsDebugMsg("Drawing style " + getDrawingStyleAsQString());
+  QgsDebugMsg("Source SRS: " + mCoordinateTransform->sourceSRS().description());
+  QgsDebugMsg("Dest   SRS: " + mCoordinateTransform->destSRS().description());
 
   return true;