Linear curve is polyinomial curve with degree = 1

Change-Id: I3785afc7b18ab3f742e4ecc0e299baafc2bd6614

chart2/source/inc/LinearRegressionCurveCalculator.hxx

@@ -20,44 +20,33 @@
 #define CHART2_LINEARREGRESSIONCURVECALCULATOR_HXX
 
 #include "RegressionCurveCalculator.hxx"
+#include "PolynomialRegressionCurveCalculator.hxx"
 
 namespace chart
 {
 
-class LinearRegressionCurveCalculator :
-        public RegressionCurveCalculator
+class LinearRegressionCurveCalculator : public PolynomialRegressionCurveCalculator
 {
 public:
     LinearRegressionCurveCalculator();
     virtual ~LinearRegressionCurveCalculator();
 
-protected:
-    virtual OUString ImplGetRepresentation(
-        const ::com::sun::star::uno::Reference< ::com::sun::star::util::XNumberFormatter >& xNumFormatter,
-        ::sal_Int32 nNumberFormatKey ) const;
-
 private:
-    // ____ XRegressionCurveCalculator ____
-    virtual void SAL_CALL recalculateRegression(
-        const ::com::sun::star::uno::Sequence< double >& aXValues,
-        const ::com::sun::star::uno::Sequence< double >& aYValues )
-        throw (::com::sun::star::uno::RuntimeException);
-    virtual double SAL_CALL getCurveValue( double x )
-        throw (::com::sun::star::lang::IllegalArgumentException,
-               ::com::sun::star::uno::RuntimeException);
-    virtual ::com::sun::star::uno::Sequence< ::com::sun::star::geometry::RealPoint2D > SAL_CALL getCurveValues(
+    virtual void SAL_CALL setRegressionProperties(
+        sal_Int32 aDegree,
+        sal_Bool  aForceIntercept,
+        double    aInterceptValue,
+        sal_Int32 aPeriod);
+
+    virtual com::sun::star::uno::Sequence< com::sun::star::geometry::RealPoint2D > SAL_CALL getCurveValues(
         double min,
         double max,
-        ::sal_Int32 nPointCount,
-        const ::com::sun::star::uno::Reference< ::com::sun::star::chart2::XScaling >& xScalingX,
-        const ::com::sun::star::uno::Reference< ::com::sun::star::chart2::XScaling >& xScalingY,
-        ::sal_Bool bMaySkipPointsInCalculation )
-        throw (::com::sun::star::lang::IllegalArgumentException,
-               ::com::sun::star::uno::RuntimeException);
-
-    // formula is: f(x) = m_fSlope * x + m_fIntercept
-    double m_fSlope;
-    double m_fIntercept;
+        sal_Int32 nPointCount,
+        const com::sun::star::uno::Reference< com::sun::star::chart2::XScaling >& xScalingX,
+        const com::sun::star::uno::Reference< com::sun::star::chart2::XScaling >& xScalingY,
+        sal_Bool bMaySkipPointsInCalculation )
+        throw (com::sun::star::lang::IllegalArgumentException,
+               com::sun::star::uno::RuntimeException);
 };
 
 } //  namespace chart

chart2/source/inc/PolynomialRegressionCurveCalculator.hxx

@@ -36,6 +36,10 @@ protected:
         const com::sun::star::uno::Reference< com::sun::star::util::XNumberFormatter >& xNumFormatter,
         sal_Int32 nNumberFormatKey ) const;
 
+    virtual double SAL_CALL getCurveValue( double x )
+        throw (com::sun::star::lang::IllegalArgumentException,
+               com::sun::star::uno::RuntimeException);
+
 private:
     // ____ XRegressionCurveCalculator ____
     virtual void SAL_CALL recalculateRegression(
@@ -43,11 +47,7 @@ private:
         const com::sun::star::uno::Sequence< double >& aYValues )
         throw (com::sun::star::uno::RuntimeException);
 
-    virtual double SAL_CALL getCurveValue( double x )
-        throw (com::sun::star::lang::IllegalArgumentException,
-               com::sun::star::uno::RuntimeException);
-
-    virtual ::com::sun::star::uno::Sequence< com::sun::star::geometry::RealPoint2D > SAL_CALL getCurveValues(
+    virtual com::sun::star::uno::Sequence< com::sun::star::geometry::RealPoint2D > SAL_CALL getCurveValues(
         double min,
         double max,
         sal_Int32 nPointCount,

chart2/source/tools/LinearRegressionCurveCalculator.cxx

@@ -31,69 +31,23 @@ namespace chart
 {
 
 LinearRegressionCurveCalculator::LinearRegressionCurveCalculator() :
-        m_fSlope( 0.0 ),
-        m_fIntercept( 0.0 )
-{
-    ::rtl::math::setNan( & m_fSlope );
-    ::rtl::math::setNan( & m_fIntercept );
-}
+    PolynomialRegressionCurveCalculator()
+{}
 
 LinearRegressionCurveCalculator::~LinearRegressionCurveCalculator()
 {}
 
-// ____ XRegressionCurveCalculator ____
-void SAL_CALL LinearRegressionCurveCalculator::recalculateRegression(
-    const uno::Sequence< double >& aXValues,
-    const uno::Sequence< double >& aYValues )
-    throw (uno::RuntimeException)
+void LinearRegressionCurveCalculator::setRegressionProperties(
+        sal_Int32 /*aDegree*/,
+        sal_Bool  aForceIntercept,
+        double    aInterceptValue,
+        sal_Int32 aPeriod)
 {
-    RegressionCalculationHelper::tDoubleVectorPair aValues(
-        RegressionCalculationHelper::cleanup(
-            aXValues, aYValues,
-            RegressionCalculationHelper::isValid()));
-
-    const size_t nMax = aValues.first.size();
-    if( nMax == 0 )
-    {
-        ::rtl::math::setNan( & m_fSlope );
-        ::rtl::math::setNan( & m_fIntercept );
-        ::rtl::math::setNan( & m_fCorrelationCoeffitient );
-        return;
-    }
-
-    const double fN = static_cast< double >( nMax );
-    double fSumX = 0.0, fSumY = 0.0, fSumXSq = 0.0, fSumYSq = 0.0, fSumXY = 0.0;
-    for( size_t i = 0; i < nMax; ++i )
-    {
-        fSumX   += aValues.first[i];
-        fSumY   += aValues.second[i];
-        fSumXSq += aValues.first[i]  * aValues.first[i];
-        fSumYSq += aValues.second[i] * aValues.second[i];
-        fSumXY  += aValues.first[i]  * aValues.second[i];
-    }
-
-    m_fSlope = (fN * fSumXY - fSumX * fSumY) / ( fN * fSumXSq - fSumX * fSumX );
-    m_fIntercept = (fSumY - m_fSlope * fSumX) / fN;
-
-    m_fCorrelationCoeffitient = ( fN * fSumXY - fSumX * fSumY ) /
-        sqrt( ( fN * fSumXSq - fSumX * fSumX ) *
-              ( fN * fSumYSq - fSumY * fSumY ) );
-}
-
-double SAL_CALL LinearRegressionCurveCalculator::getCurveValue( double x )
-    throw (lang::IllegalArgumentException,
-           uno::RuntimeException)
-{
-    double fResult;
-    ::rtl::math::setNan( & fResult );
-
-    if( ! ( ::rtl::math::isNan( m_fSlope ) ||
-            ::rtl::math::isNan( m_fIntercept )))
-    {
-        fResult = m_fSlope * x + m_fIntercept;
-    }
-
-    return fResult;
+    PolynomialRegressionCurveCalculator::setRegressionProperties(
+                                            1,
+                                            aForceIntercept,
+                                            aInterceptValue,
+                                            aPeriod);
 }
 
 uno::Sequence< geometry::RealPoint2D > SAL_CALL LinearRegressionCurveCalculator::getCurveValues(
@@ -120,50 +74,6 @@ uno::Sequence< geometry::RealPoint2D > SAL_CALL LinearRegressionCurveCalculator:
     return RegressionCurveCalculator::getCurveValues( min, max, nPointCount, xScalingX, xScalingY, bMaySkipPointsInCalculation );
 }
 
-OUString LinearRegressionCurveCalculator::ImplGetRepresentation(
-    const uno::Reference< util::XNumberFormatter >& xNumFormatter,
-    ::sal_Int32 nNumberFormatKey ) const
-{
-    OUStringBuffer aBuf( "f(x) = ");
-
-    bool bHaveSlope = false;
-
-    if( m_fSlope != 0.0 )
-    {
-        if( ::rtl::math::approxEqual( fabs( m_fSlope ), 1.0 ))
-        {
-            if( m_fSlope < 0 )
-                aBuf.append( UC_MINUS_SIGN );
-        }
-        else
-            aBuf.append( getFormattedString( xNumFormatter, nNumberFormatKey, m_fSlope ));
-        aBuf.append( sal_Unicode( 'x' ));
-        bHaveSlope = true;
-    }
-
-    if( bHaveSlope )
-    {
-        if( m_fIntercept < 0.0 )
-        {
-            aBuf.append( UC_SPACE );
-            aBuf.append( UC_MINUS_SIGN );
-            aBuf.append( UC_SPACE );
-            aBuf.append( getFormattedString( xNumFormatter, nNumberFormatKey, fabs( m_fIntercept )));
-        }
-        else if( m_fIntercept > 0.0 )
-        {
-            aBuf.appendAscii( RTL_CONSTASCII_STRINGPARAM( " + " ));
-            aBuf.append( getFormattedString( xNumFormatter, nNumberFormatKey, m_fIntercept ));
-        }
-    }
-    else
-    {
-        aBuf.append( getFormattedString( xNumFormatter, nNumberFormatKey, m_fIntercept ));
-    }
-
-    return aBuf.makeStringAndClear();
-}
-
 } //  namespace chart
 
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