tdf#91725: Use lighter default colour for minor grid lines

Change-Id: I4be2adac1004ad4ace474c9a271cf8e21986da07
Reviewed-on: https://gerrit.libreoffice.org/16819Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

chart2/source/inc/LinePropertiesHelper.hxx

@@ -56,6 +56,8 @@ namespace LinePropertiesHelper
         ::com::sun::star::beans::XPropertySet >& xLineProperties );
     void SetLineInvisible( const ::com::sun::star::uno::Reference<
         ::com::sun::star::beans::XPropertySet >& xLineProperties );
+    void SetLineColor( const ::com::sun::star::uno::Reference<
+        ::com::sun::star::beans::XPropertySet >& xGridProperties, sal_Int32 nColor  );
 }
 
 } //  namespace chart

chart2/source/model/main/Axis.cxx

@@ -436,6 +436,7 @@ void Axis::AllocateSubGrids()
             {
                 m_aSubGridProperties[ i ] = new GridProperties();
                 LinePropertiesHelper::SetLineInvisible( m_aSubGridProperties[ i ] );
+                LinePropertiesHelper::SetLineColor( m_aSubGridProperties[ i ], static_cast<sal_Int32>(0xdddddd) ); //gray2
                 aNewBroadcasters.push_back( m_aSubGridProperties[ i ] );
             }
         }

chart2/source/tools/LinePropertiesHelper.cxx

@@ -168,6 +168,23 @@ void LinePropertiesHelper::SetLineInvisible( const ::com::sun::star::uno::Refere
     }
 }
 
+void LinePropertiesHelper::SetLineColor( const ::com::sun::star::uno::Reference<
+     ::com::sun::star::beans::XPropertySet >& xLineProperties, sal_Int32 nColor  )
+{
+    try
+    {
+        if( xLineProperties.is() )
+        {
+            xLineProperties->setPropertyValue( "LineColor", uno::makeAny( nColor ) );
+        }
+    }
+    catch( const uno::Exception & ex )
+    {
+        ASSERT_EXCEPTION( ex );
+    }
+}
+
+
 } //  namespace chart
 
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