From 2ba62274621e5cc5ec5404374e960a15cfccdb8f Mon Sep 17 00:00:00 2001
From: mhugent <mhugent@c8812cc2-4d05-0410-92ff-de0c093fc19c>
Date: Sun, 31 Oct 2010 17:12:39 +0000
Subject: [PATCH] Store svg fill pathes relativ to default svg directory. Fixes
 bug #3154

git-svn-id: http://svn.osgeo.org/qgis/trunk@14463 c8812cc2-4d05-0410-92ff-de0c093fc19c
---
 src/core/qgsapplication.cpp                   | 110 ++++++++++++++++++
 src/core/qgsapplication.h                     |   7 ++
 .../symbology-ng/qgsfillsymbollayerv2.cpp     |   5 +-
 3 files changed, 120 insertions(+), 2 deletions(-)

diff --git a/src/core/qgsapplication.cpp b/src/core/qgsapplication.cpp
index ccf1eba641e..1fdaaa1d896 100644
--- a/src/core/qgsapplication.cpp
+++ b/src/core/qgsapplication.cpp
@@ -482,3 +482,113 @@ void QgsApplication::registerOgrDrivers()
     OGRRegisterAll();
   }
 }
+
+QString QgsApplication::absolutePathToRelativePath( const QString& apath, const QString& targetPath )
+{
+#if defined( Q_OS_WIN )
+  const Qt::CaseSensitivity cs = Qt::CaseInsensitive;
+
+  aPath.replace( "\\", "/" );
+  if ( aPath.startsWith( "//" ) )
+  {
+    // keep UNC prefix
+    aPath = "\\\\" + aPath.mid( 2 );
+  }
+
+  targetPath.replace( "\\", "/" );
+  if ( targetPath.startsWith( "//" ) )
+  {
+    // keep UNC prefix
+    targetPath = "\\\\" + targetPath.mid( 2 );
+  }
+#else
+  const Qt::CaseSensitivity cs = Qt::CaseSensitive;
+#endif
+
+  QStringList targetElems = targetPath.split( "/", QString::SkipEmptyParts );
+  QStringList aPathElems = apath.split( "/", QString::SkipEmptyParts );
+
+  targetElems.removeAll( "." );
+  aPathElems.removeAll( "." );
+
+  // remove common part
+  int n = 0;
+  while ( aPathElems.size() > 0 &&
+          targetElems.size() > 0 &&
+          aPathElems[0].compare( targetElems[0], cs ) == 0 )
+  {
+    aPathElems.removeFirst();
+    targetElems.removeFirst();
+    n++;
+  }
+
+  if ( n == 0 )
+  {
+    // no common parts; might not even by a file
+    return apath;
+  }
+
+  if ( targetElems.size() > 0 )
+  {
+    // go up to the common directory
+    for ( int i = 0; i < targetElems.size(); i++ )
+    {
+      aPathElems.insert( 0, ".." );
+    }
+  }
+  else
+  {
+    // let it start with . nevertheless,
+    // so relative path always start with either ./ or ../
+    aPathElems.insert( 0, "." );
+  }
+
+  return aPathElems.join( "/" );
+}
+
+QString QgsApplication::relativePathToAbsolutePath( const QString& rpath, const QString& targetPath )
+{
+  // relative path should always start with ./ or ../
+  if ( !rpath.startsWith( "./" ) && !rpath.startsWith( "../" ) )
+  {
+    return rpath;
+  }
+
+#if defined(Q_OS_WIN)
+  rPath.replace( "\\", "/" );
+  targetPath.replace( "\\", "/" );
+
+  bool uncPath = targetPath.startsWith( "//" );
+#endif
+
+  QStringList srcElems = rpath.split( "/", QString::SkipEmptyParts );
+  QStringList targetElems = targetPath.split( "/", QString::SkipEmptyParts );
+
+#if defined(Q_OS_WIN)
+  if ( uncPath )
+  {
+    targetElems.insert( 0, "" );
+    targetElems.insert( 0, "" );
+  }
+#endif
+
+  // append source path elements
+  targetElems << srcElems;
+  targetElems.removeAll( "." );
+
+  // resolve ..
+  int pos;
+  while (( pos = targetElems.indexOf( ".." ) ) > 0 )
+  {
+    // remove preceding element and ..
+    targetElems.removeAt( pos - 1 );
+    targetElems.removeAt( pos - 1 );
+  }
+
+#if !defined(Q_OS_WIN)
+  // make path absolute
+  targetElems.prepend( "" );
+#endif
+
+  return targetElems.join( "/" );
+}
diff --git a/src/core/qgsapplication.h b/src/core/qgsapplication.h
index 9ca683edb88..4246fbc3ad8 100644
--- a/src/core/qgsapplication.h
+++ b/src/core/qgsapplication.h
@@ -192,6 +192,13 @@ class CORE_EXPORT QgsApplication: public QApplication
      */
     static void registerOgrDrivers();
 
+    /**Converts absolute path to path relative to target
+      @note: this method was added in version 1.6*/
+    static QString absolutePathToRelativePath( const QString& apath, const QString& targetPath );
+    /**Converts path relative to target to an absolute path
+      @note: this method was added in version 1.6*/
+    static QString relativePathToAbsolutePath( const QString& rpath, const QString& targetPath );
+
   private:
     static QString mPrefixPath;
     static QString mPluginPath;
diff --git a/src/core/symbology-ng/qgsfillsymbollayerv2.cpp b/src/core/symbology-ng/qgsfillsymbollayerv2.cpp
index d029941516e..3116eb2f16d 100644
--- a/src/core/symbology-ng/qgsfillsymbollayerv2.cpp
+++ b/src/core/symbology-ng/qgsfillsymbollayerv2.cpp
@@ -1,6 +1,7 @@
 #include "qgsfillsymbollayerv2.h"
 #include "qgssymbollayerv2utils.h"
 
+#include "qgsapplication.h"
 #include "qgsrendercontext.h"
 #include "qgsproject.h"
 
@@ -158,7 +159,7 @@ QgsSymbolLayerV2* QgsSVGFillSymbolLayer::create( const QgsStringMap& properties
   }
   if ( properties.contains( "svgFile" ) )
   {
-    svgFilePath = QgsProject::instance()->readPath( properties["svgFile"] );
+    svgFilePath = QgsApplication::relativePathToAbsolutePath( properties["svgFile"], QgsApplication::svgPath() );
   }
 
   if ( !svgFilePath.isEmpty() )
@@ -264,7 +265,7 @@ QgsStringMap QgsSVGFillSymbolLayer::properties() const
   QgsStringMap map;
   if ( !mSvgFilePath.isEmpty() )
   {
-    map.insert( "svgFile", QgsProject::instance()->writePath( mSvgFilePath ) );
+    map.insert( "svgFile", QgsApplication::absolutePathToRelativePath( mSvgFilePath, QgsApplication::svgPath() ) );
   }
   else
   {