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/***************************************************************************
ScaleWidget.h - widget for drawing a scale under an image
-------------------
begin : Sep 18 2001
copyright : (C) 2001 by Thomas Eschenbacher
email : Thomas Eschenbacher <thomas.eschenbacher@gmx.de>
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef _SCALE_WIDGET_H_
#define _SCALE_WIDGET_H_
#include "config.h"
#include <qpixmap.h>
#include <qstring.h>
#include <qwidget.h>
class QPainter;
class QSize;
class ScaleWidget : public QWidget
{
public:
/**
* Primitve constructor for usage in a Qt designer's dialog
* @param parent the widget's parent widget
* @param name the name of the widget
*/
ScaleWidget(QWidget *parent, const char *name);
/**
* Constructor with initialization.
* @param parent the widget's parent widget
* @param low left/lower border value
* @param high right/upper border value
* @param unit text of the units to show
*/
ScaleWidget(QWidget *parent, int low, int high, const QString &unit);
/** Destructor */
~ScaleWidget();
/**
* Sets the border values.
* @param min left/lower border value
* @param max right/upper border value
*/
void setMinMax(int min, int max);
/**
* Set the text of the units.
* @param text the units to show
*/
void setUnit(const QString &text);
/**
* Sets logarithmic or linear mode.
* @param log if true, set logarithmic mode, if not select
* linear mode
*/
void setLogMode(bool log);
/** minimum size of the widtget, @see QWidget::minimumSize() */
virtual const QSize minimumSize();
/** optimal size for the widget, @see QWidget::sizeHint() */
virtual const QSize sizeHint();
protected:
/**
* Draws the widget.
* @see QWidget::paintEvent
*/
void paintEvent(QPaintEvent *);
/**
* Draws a linear scale
* @param p reference to the painter
* @param w width of the drawing area in pixels
* @param h height of the drawing area in pixels
* @param inverse of true, the coordinate system is rotated
* to be upside-down and the scale has to be drawn
* mirrored in x and y axis.
*/
void drawLinear(QPainter &p, int w, int h, bool inverse);
/**
* @todo implementation of logarithmic scale
*/
void drawLog(QPainter &p, int w, int h, bool inverse);
/**
* Painting routine for own small font with fixed size
* There are Problems with smaller displays using QFont,
* sizes are not correct.
* @param p reference to the painter
* @param x coordinate of the left edge of the first character
* @param y coordinate of the lower edge of the first character
* @param ofs width of each character
* @param reverse if true, print reverse: x is right edge of
* the text, like "align right".
* @param text the text to be printed. Must only contain known
* characters that are present in the font bitmap, like
* numbers, letters and some special chars like "%",
* space, dot and comma.
*/
void paintText(QPainter &p, int x, int y, int ofs,
bool reverse, const QString &text);
private:
/** Lower boundary value */
int m_low;
/** Upper boundary value */
int m_high;
/** If true, logarithmic mode, linear mode if false */
bool m_logmode;
/** String containing the name of the unit */
QString m_unittext;
/** Pixmap with all letters of our small font */
QPixmap m_scalefont;
};
#endif // SCALE_WIDGET_H
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