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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 <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: */
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