Display correct equation with multiple trendlines in chart.

When there were multiple trendlines for one data series and one
was selected, always the equation and R^2 of the first trendline
was displayed in status bar.

Change-Id: I320261e129c51bbdd1228173ca2f1d8447fdcb89

chart2/source/controller/dialogs/ObjectNameProvider.cxx

@@ -552,9 +552,11 @@ OUString ObjectNameProvider::getHelpText( const OUString& rObjectCID, const Refe
             aRet = SCH_RESSTR( STR_OBJECT_CURVE_WITH_PARAMETERS );
             Reference< chart2::XDataSeries > xSeries( ObjectIdentifier::getDataSeriesForCID( rObjectCID , xChartModel ));
             Reference< chart2::XRegressionCurveContainer > xCurveCnt( xSeries, uno::UNO_QUERY );
+
             if( xCurveCnt.is())
             {
-                Reference< chart2::XRegressionCurve > xCurve( RegressionCurveHelper::getFirstCurveNotMeanValueLine( xCurveCnt ));
+                sal_Int32 nCurveIndex = ObjectIdentifier::getIndexFromParticleOrCID( rObjectCID );
+                Reference< chart2::XRegressionCurve > xCurve( RegressionCurveHelper::getRegressionCurveAtIndex(xCurveCnt, nCurveIndex) );
                 if( xCurve.is())
                 {
                     try

chart2/source/inc/RegressionCurveHelper.hxx

@@ -104,6 +104,13 @@ public:
             const com::sun::star::uno::Reference<
                 com::sun::star::chart2::XRegressionCurveContainer >& xCurveContainer );
 
+    /** Returns the regression curve found at the index provided.
+     */
+    static com::sun::star::uno::Reference<com::sun::star::chart2::XRegressionCurve >
+        getRegressionCurveAtIndex(
+            const com::sun::star::uno::Reference<com::sun::star::chart2::XRegressionCurveContainer >& xCurveContainer,
+            sal_Int32 aIndex);
+
     /** Returns the type of the first regression curve found that is not of type
         mean-value line
      */

chart2/source/tools/RegressionCurveHelper.cxx

@@ -509,6 +509,30 @@ uno::Reference< chart2::XRegressionCurve > RegressionCurveHelper::getFirstCurveN
     return NULL;
 }
 
+uno::Reference< chart2::XRegressionCurve > RegressionCurveHelper::getRegressionCurveAtIndex(
+    const Reference< XRegressionCurveContainer >& xCurveContainer,
+    sal_Int32 aIndex )
+{
+    if( !xCurveContainer.is())
+        return NULL;
+
+    try
+    {
+        uno::Sequence< uno::Reference< chart2::XRegressionCurve > > aCurves(xCurveContainer->getRegressionCurves());
+        if(0 <= aIndex && aIndex < aCurves.getLength())
+        {
+            if(!isMeanValueLine(aCurves[aIndex]))
+                return aCurves[aIndex];
+        }
+    }
+    catch( const Exception & ex )
+    {
+        ASSERT_EXCEPTION( ex );
+    }
+
+    return NULL;
+}
+
 RegressionCurveHelper::tRegressionType RegressionCurveHelper::getRegressionType(
     const Reference< XRegressionCurve > & xCurve )
 {