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| -rw-r--r-- | chart2/source/view/inc/ScaleAutomatism.hxx | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/chart2/source/view/inc/ScaleAutomatism.hxx b/chart2/source/view/inc/ScaleAutomatism.hxx new file mode 100644 index 000000000..1141c9e87 --- /dev/null +++ b/chart2/source/view/inc/ScaleAutomatism.hxx @@ -0,0 +1,144 @@ +/* -*- 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 <com/sun/star/chart2/ScaleData.hpp> + +#include <tools/date.hxx> + +namespace chart { struct ExplicitIncrementData; } +namespace chart { struct ExplicitScaleData; } + +namespace chart +{ + +/** This class implements the calculation of automatic axis limits. + * + * This class is used for calculating axis scales and increments in the form + * of instances of `ExplicitScaleData` and `ExplicitIncrementData` classes. + * When a `ScaleAutomatism` instance is created a `ScaleData` object is passed + * to the constructor. Objects of `ScaleData` type are initialized by + * the `createCoordinateSystem` method of some chart type (e.g. + * the `PieChartType` class) and belong to some `Axis` object, they can be + * accessed through the `XAxis` interface (`XAxis::getScaleData`). + */ +class ScaleAutomatism +{ +public: + explicit ScaleAutomatism( + const css::chart2::ScaleData& rSourceScale, const Date& rNullDate ); + + /** Expands own value range with the passed minimum and maximum. + * + * It allows to set up the `m_fValueMinimum` and the `m_fValueMaximum` + * parameters which are used by the `calculateExplicitScaleAndIncrement` + * method for initializing the `Minimum` and `Maximum` properties of the + * explicit scale when the same properties of the `ScaleData` object are + * undefined (that is empty `uno::Any` objects). + */ + void expandValueRange( double fMinimum, double fMaximum ); + void resetValueRange(); + + /** Sets additional auto scaling options. + @param bExpandBorderToIncrementRhythm If true, expands automatic + borders to the fixed or calculated increment rhythm. + @param bExpandIfValuesCloseToBorder If true, expands automatic borders + if values are too close (closer than 1/21 of visible area). + @param bExpandWideValuesToZero If true, expands automatic border to + zero, if source values are positive only or negative only, and if + the absolute values are wide spread (at least one value is less + than 5/6 of absolute maximum), or if all values are equal. + @param bExpandNarrowValuesTowardZero If true, expands automatic border + toward zero (50% of the visible range), if source values are + positive only or negative only, and if the absolute values are + close to the absolute maximum (no value is less than 5/6 of + absolute maximum). */ + void setAutoScalingOptions( + bool bExpandBorderToIncrementRhythm, + bool bExpandIfValuesCloseToBorder, + bool bExpandWideValuesToZero, + bool bExpandNarrowValuesTowardZero ); + + /** Sets the maximum allowed number of automatic main increments. + @descr The number of main increments may be limited e.g. by the length + of the axis and the font size of the axis caption text. */ + void setMaximumAutoMainIncrementCount( sal_Int32 nMaximumAutoMainIncrementCount ); + + /** Sets the time resolution to be used in case it is not set explicitly within the scale + */ + void setAutomaticTimeResolution( sal_Int32 nTimeResolution ); + + /** Fills the passed scale data and increment data according to the own settings. + * + * It performs the initialization of the passed explicit scale and + * explicit increment parameters, mainly the initialization is achieved by + * using the `ScaleData` object as data source. However other parameters + * which affect the behavior of this method can be set through + * the `setAutoScalingOptions` and the `expandValueRange` methods. + */ + void calculateExplicitScaleAndIncrement( + ExplicitScaleData& rExplicitScale, + ExplicitIncrementData& rExplicitIncrement ) const; + + const css::chart2::ScaleData& getScale() const { return m_aSourceScale;} + const Date& getNullDate() const { return m_aNullDate;} + +private: + /** Fills the passed scale data and increment data for category scaling. */ + void calculateExplicitIncrementAndScaleForCategory( + ExplicitScaleData& rExplicitScale, + ExplicitIncrementData& rExplicitIncrement, + bool bAutoMinimum, bool bAutoMaximum ) const; + + /** Fills the passed scale data and increment data for logarithmic scaling. */ + void calculateExplicitIncrementAndScaleForLogarithmic( + ExplicitScaleData& rExplicitScale, + ExplicitIncrementData& rExplicitIncrement, + bool bAutoMinimum, bool bAutoMaximum ) const; + + /** Fills the passed scale data and increment data for linear scaling. */ + void calculateExplicitIncrementAndScaleForLinear( + ExplicitScaleData& rExplicitScale, + ExplicitIncrementData& rExplicitIncrement, + bool bAutoMinimum, bool bAutoMaximum ) const; + + /** Fills the passed scale data and increment data for date-time axis. */ + void calculateExplicitIncrementAndScaleForDateTimeAxis( + ExplicitScaleData& rExplicitScale, + ExplicitIncrementData& rExplicitIncrement, + bool bAutoMinimum, bool bAutoMaximum ) const; + +private: + css::chart2::ScaleData m_aSourceScale; + + double m_fValueMinimum; /// Minimum of all source values. + double m_fValueMaximum; /// Maximum of all source values. + sal_Int32 m_nMaximumAutoMainIncrementCount; /// Maximum number of automatic main increments. + bool m_bExpandBorderToIncrementRhythm; /// true = Expand to main increments. + bool m_bExpandIfValuesCloseToBorder; /// true = Expand if values are too close to the borders. + bool m_bExpandWideValuesToZero; /// true = Expand wide spread values to zero. + bool m_bExpandNarrowValuesTowardZero; /// true = Expand narrow range toward zero (add half of range). + sal_Int32 m_nTimeResolution;// a constant out of css::chart::TimeUnit + + Date m_aNullDate; +}; + +} //namespace chart + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |