kdelibs/kdeui/plotting/kplotaxis.h

/*  -*- C++ -*-
    This file is part of the KDE libraries
    Copyright (C) 2005 Andreas Nicolai <Andreas.Nicolai@gmx.net>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#ifndef KPLOTAXIS_H
#define KPLOTAXIS_H

#include <kdeui_export.h>

#include <QtCore/qstring.h>
#include <QtCore/qlist.h>

/**
 * @short Axis for KPlotWidget
 *
 * Contains all data for drawing an axis including format specification axis labels.
 *
 * @author Andreas Nicolai
 * @version 1.0
 */
class KDEUI_EXPORT KPlotAxis {
public:

    /**
     * Constructor, constructs an axis with the label @p label.
     */
    explicit KPlotAxis( const QString& label = QString() );

    /**
     * Destructor.
     */
    ~KPlotAxis();

    /**
     * @return whether the axis is visible or not
     */
    bool isVisible() const;

    /**
     * Sets the "visible" property of the axis.
     * @param visible if true, this axis will be drawn on the KPlotWidget
     */
    void setVisible( bool visible );

    /**
     * @return whether tick labels will be drawn for this axis
     */
    bool areTickLabelsShown() const;

    /**
     * Determine whether tick labels will be drawn for this axis.
     * @param b if true, tick labels will be drawn.
     */
    void setTickLabelsShown( bool b );

    /**
     * Sets the axis label.
     * Set the label to an empty string to omit the axis label.
     * @param label a string describing the data plotted on the axis.
     */
    void setLabel( const QString& label );

    /**
     * @return the label string for this axis
     */
    QString label() const;

    /**
     * @return the ticklabel string for the given value, rendered according
     * to the current format specification.
     * @param the value to be rendered as a tick label.
     * @sa setTickLabelFormat()
     */
    QString tickLabel( double value ) const;

    /**
     * Set the display format for converting the double value of the 
     * tick's position to the QString for the tick label.
     *
     * Normally, the format character is one of 'e', 'E', 'f', 'g', or 'G'
     * (see the documentation for QString::arg(double) for details).
     *
     * In addition, it is possible to set the format character to 't';
     * in this case the tickmark value is interpreted as a time in hours,
     * and the ticklabel string will be in "hh:mm" clock format.
     * Note that when the format character is 't', the fieldWidth and prec
     * values are ignored.
     *
     * @param format the format specification character 
     * @param fieldWidth the number of characters in the output string.
     * If set to 0, the string will be as wide as it needs to be to fully 
     * render the value.
     * @param precision the number of characters following the decimal point.
     */
    void setTickLabelFormat( char format = 'g', int fieldWidth = 0, int precision = -1 );

    /**
     * @return the field width of the tick labels
     */
    int tickLabelWidth() const;

    /**
     * @return the number format of the tick labels
     */
    char tickLabelFormat() const;

    /**
     * @return the number precision of the tick labels
     */
    int tickLabelPrecision() const;

    /**
     * Determine the positions of major and minor tickmarks for this axis.
     * @note this function is called by KPlotWidget whenever the plot's 
     * limits are modified.
     * @param x0 the minimum data coordinate of the axis.
     * @param length the range covered by the axis, in data units.
     * @sa majorTickMarks()
     * @sa minorTickMarks()
     */
    void setTickMarks( double x0, double length );

    /**
     * @return the list of coordinates of the major tickmarks for this axis
     * @note the positions of tickmarks are automatically computed by setTickMarks().
     * @sa setTickMarks()
     * @sa minorTickMarks()
     */
    QList< double > majorTickMarks() const;

    /**
     * @return the list with the minor tickmarks
     * @note the positions of tickmarks are automatically computed by setTickMarks().
     * @sa setTickMarks()
     * @sa majorTickMarks()
     */
    QList< double > minorTickMarks() const;

private:
    class Private;
    Private * const d;

    Q_DISABLE_COPY( KPlotAxis )
};

#endif // KPLOTAXIS_H