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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "charttest.hxx"
+#include <com/sun/star/chart2/XRegressionCurveContainer.hpp>
+#include <com/sun/star/chart2/XRegressionCurveCalculator.hpp>
+#include <SpecialCharacters.hxx>
+
+
+// Define the index of sheets in the test document
+constexpr sal_Int32 SHEET_POTENTIAL1 = 0;
+constexpr sal_Int32 SHEET_POTENTIAL2 = 1;
+constexpr sal_Int32 SHEET_LINEAR1 = 2;
+constexpr sal_Int32 SHEET_POLYNOMIAL1 = 3;
+constexpr sal_Int32 SHEET_EXPONENTIAL1 = 4;
+constexpr sal_Int32 SHEET_EXPONENTIAL2 = 5;
+
+class Chart2TrendCalculators : public ChartTest
+{
+public:
+ void setUp() override;
+ void tearDown() override;
+
+ void testPotentialRegression1();
+ void testPotentialRegression2();
+ void testLinearRegression1();
+ void testPolynomialRegression1();
+ void testExponentialRegression1();
+ void testExponentialRegression2();
+
+ CPPUNIT_TEST_SUITE(Chart2TrendCalculators);
+ CPPUNIT_TEST(testPotentialRegression1);
+ CPPUNIT_TEST(testPotentialRegression2);
+ CPPUNIT_TEST(testLinearRegression1);
+ CPPUNIT_TEST(testPolynomialRegression1);
+ CPPUNIT_TEST(testExponentialRegression1);
+ CPPUNIT_TEST(testExponentialRegression2);
+ CPPUNIT_TEST_SUITE_END();
+
+private:
+
+ Reference<chart2::XRegressionCurve> m_xCurve;
+ Reference< chart2::XRegressionCurveCalculator > m_xRegressionCurveCalculator;
+
+ void loadCalculatorFromSheet(sal_Int32 nSheet);
+ void checkCalculator(
+ const Sequence< double >& xValues, const Sequence< double >& yValues,
+ const OUString& sExpectedFormula );
+
+};
+
+void Chart2TrendCalculators::setUp()
+{
+ ChartTest::setUp();
+ load(u"/chart2/qa/extras/data/ods/", u"trend_calculators.ods");
+}
+
+void Chart2TrendCalculators::tearDown()
+{
+ m_xRegressionCurveCalculator.clear();
+ m_xCurve.clear();
+ ChartTest::tearDown();
+}
+
+void Chart2TrendCalculators::loadCalculatorFromSheet(sal_Int32 nSheet)
+{
+ Reference<chart2::XChartDocument> xChartDoc = getChartDocFromSheet(nSheet, mxComponent);
+ CPPUNIT_ASSERT_MESSAGE("failed to load chart", xChartDoc.is());
+ CPPUNIT_ASSERT(xChartDoc.is());
+
+ Reference<chart2::XDataSeries> xDataSeries = getDataSeriesFromDoc(xChartDoc, 0);
+ CPPUNIT_ASSERT(xDataSeries.is());
+
+ Reference<chart2::XRegressionCurveContainer> xRegressionCurveContainer(xDataSeries, UNO_QUERY_THROW);
+
+ Sequence< Reference< chart2::XRegressionCurve > > xRegressionCurveSequence = xRegressionCurveContainer->getRegressionCurves();
+ CPPUNIT_ASSERT_EQUAL(sal_Int32(1), xRegressionCurveSequence.getLength());
+
+ m_xCurve = xRegressionCurveSequence[0];
+ CPPUNIT_ASSERT(m_xCurve.is());
+
+ m_xRegressionCurveCalculator = m_xCurve->getCalculator();
+ CPPUNIT_ASSERT(m_xRegressionCurveCalculator.is());
+}
+
+void Chart2TrendCalculators::checkCalculator(
+ const Sequence< double >& xValues, const Sequence< double >& yValues,
+ const OUString& sExpectedFormula )
+{
+ m_xRegressionCurveCalculator->recalculateRegression( xValues, yValues );
+ OUString aRepresentation = m_xRegressionCurveCalculator->getRepresentation ();
+ CPPUNIT_ASSERT_EQUAL( sExpectedFormula, aRepresentation );
+ double r2 = m_xRegressionCurveCalculator->getCorrelationCoefficient();
+ CPPUNIT_ASSERT_DOUBLES_EQUAL( 1.0, r2, 1e-8 );
+}
+
+// test y = A x ^ B
+void Chart2TrendCalculators::testPotentialRegression1()
+{
+ loadCalculatorFromSheet( SHEET_POTENTIAL1 );
+ m_xRegressionCurveCalculator->setRegressionProperties( 0, false, 0, 0, 0 );
+ Sequence< double > xValues( 7 );
+ auto pxValues = xValues.getArray();
+ Sequence< double > yValues( 7 );
+ auto pyValues = yValues.getArray();
+ for (int i=0; i<7; i++)
+ {
+ const double d = static_cast<double>(i);
+ pxValues[i] = d;
+ pyValues[i] = 2.0 * pow ( d, 3 );
+ }
+ checkCalculator( xValues, yValues, "f(x) = 2 x^3");
+}
+
+// test y = A x ^ B
+void Chart2TrendCalculators::testPotentialRegression2()
+{
+ loadCalculatorFromSheet( SHEET_POTENTIAL2 );
+ m_xRegressionCurveCalculator->setRegressionProperties( 0, false, 0, 0, 0 );
+ Sequence< double > xValues( 7 );
+ auto pxValues = xValues.getArray();
+ Sequence< double > yValues( 7 );
+ auto pyValues = yValues.getArray();
+ for (int i=0; i<7; i++)
+ {
+ const double d = static_cast<double>(i);
+ pxValues[i] = d;
+ pyValues[i] = -2.0 * pow ( d, 3 );
+ }
+ checkCalculator( xValues, yValues, "f(x) = "+ OUStringChar(aMinusSign) +" 2 x^3");
+}
+
+// test y = - 2 X - 5
+void Chart2TrendCalculators::testLinearRegression1()
+{
+ loadCalculatorFromSheet( SHEET_LINEAR1 );
+ m_xRegressionCurveCalculator->setRegressionProperties( 1, false, 0, 0, 0 );
+ Sequence< double > xValues( 7 );
+ auto pxValues = xValues.getArray();
+ Sequence< double > yValues( 7 );
+ auto pyValues = yValues.getArray();
+ for (int i=0; i<7; i++)
+ {
+ const double d = static_cast<double>(i);
+ pxValues[i] = d;
+ pyValues[i] = - 2.0 * d - 5.0 ;
+ }
+ checkCalculator( xValues, yValues, "f(x) = "+ OUStringChar(aMinusSign) +" 2 x "+ OUStringChar(aMinusSign) +" 5");
+}
+
+// test y = A x ^ B
+void Chart2TrendCalculators::testPolynomialRegression1()
+{
+ loadCalculatorFromSheet( SHEET_POLYNOMIAL1 );
+ m_xRegressionCurveCalculator->setRegressionProperties( 2, false, 0, 0, 0 );
+ Sequence< double > xValues( 7 );
+ auto pxValues = xValues.getArray();
+ Sequence< double > yValues( 7 );
+ auto pyValues = yValues.getArray();
+ for (int i=0; i<7; i++)
+ {
+ const double d = static_cast<double>(i);
+ pxValues[i] = d;
+ pyValues[i] = - 2.0 * d * d + 4 * d - 5;
+ }
+ OUString sExpectedFormula( "f(x) = "+ OUStringChar(aMinusSign) +" 2 x" + OUStringChar( aSuperscriptFigures[2] ) + " + 4 x "+ OUStringChar(aMinusSign) +" 5" );
+ checkCalculator( xValues, yValues, sExpectedFormula );
+}
+
+void Chart2TrendCalculators::testExponentialRegression1()
+{
+ loadCalculatorFromSheet( SHEET_EXPONENTIAL1 );
+ m_xRegressionCurveCalculator->setRegressionProperties( 0, false, 0, 0, 0 );
+ Sequence< double > xValues( 7 );
+ auto pxValues = xValues.getArray();
+ Sequence< double > yValues( 7 );
+ auto pyValues = yValues.getArray();
+ for (int i=0; i<7; i++)
+ {
+ const double d = static_cast<double>(i);
+ pxValues[i] = d;
+ pyValues[i] = 2.0 * exp ( 0.3 * d );
+ }
+ checkCalculator( xValues, yValues, "f(x) = 2 exp( 0.3 x )");
+}
+
+void Chart2TrendCalculators::testExponentialRegression2()
+{
+ loadCalculatorFromSheet( SHEET_EXPONENTIAL2 );
+ m_xRegressionCurveCalculator->setRegressionProperties( 0, false, 0, 0, 0 );
+ Sequence< double > xValues( 7 );
+ auto pxValues = xValues.getArray();
+ Sequence< double > yValues( 7 );
+ auto pyValues = yValues.getArray();
+ for (int i=0; i<7; i++)
+ {
+ const double d = static_cast<double>(i);
+ pxValues[i] = d;
+ pyValues[i] = -2.0 * exp ( 0.3 * d );
+ }
+ checkCalculator( xValues, yValues, "f(x) = "+ OUStringChar(aMinusSign) + " 2 exp( 0.3 x )");
+}
+
+
+CPPUNIT_TEST_SUITE_REGISTRATION(Chart2TrendCalculators);
+
+CPPUNIT_PLUGIN_IMPLEMENT();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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