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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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#pragma once
+
+#include "RegressionCurveCalculator.hxx"
+
+namespace chart
+{
+
+class ExponentialRegressionCurveCalculator final : public RegressionCurveCalculator
+{
+public:
+ ExponentialRegressionCurveCalculator();
+ virtual ~ExponentialRegressionCurveCalculator() override;
+
+protected:
+ virtual OUString ImplGetRepresentation(
+ const css::uno::Reference<css::util::XNumberFormatter>& xNumFormatter,
+ sal_Int32 nNumberFormatKey, sal_Int32* pFormulaLength = nullptr ) const override;
+
+private:
+ // ____ XRegressionCurveCalculator ____
+ virtual void SAL_CALL recalculateRegression(
+ const css::uno::Sequence<double>& aXValues,
+ const css::uno::Sequence<double>& aYValues ) override;
+
+ virtual double SAL_CALL getCurveValue( double x ) override;
+
+ virtual css::uno::Sequence<css::geometry::RealPoint2D> SAL_CALL getCurveValues(
+ double min,
+ double max,
+ sal_Int32 nPointCount,
+ const css::uno::Reference<css::chart2::XScaling>& xScalingX,
+ const css::uno::Reference<css::chart2::XScaling>& xScalingY,
+ sal_Bool bMaySkipPointsInCalculation ) override;
+
+ // formula is: f(x) = m_fSign * exp(m_fLogIntercept) * exp( m_fLogSlope * x )
+ // mathematical model f(x) = Intercept * Slope^x
+ double m_fLogSlope;
+ double m_fLogIntercept;
+ double m_fSign;
+};
+
+} // namespace chart
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */