lyx_mirror/src/lyxlength.h

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// -*- C++ -*-
/**
* \file lyxlength.h
* Copyright 1995-2002 the LyX Team
* Read the file COPYING
*
* \author Matthias Ettrich
*/
#ifndef LYX_LENGTH_H
#define LYX_LENGTH_H
#include "LString.h"
/**
* LyXLength - Represents latex length measurement
*/
class LyXLength {
public:
/// length units
enum UNIT {
SP, ///< Scaled point (65536sp = 1pt) TeX's smallest unit.
PT, ///< Point = 1/72.27in = 0.351mm
BP, ///< Big point (72bp = 1in), also PostScript point
DD, ///< Didot point = 1/72 of a French inch, = 0.376mm
MM, ///< Millimeter = 2.845pt
PC, ///< Pica = 12pt = 4.218mm
CC, ///< Cicero = 12dd = 4.531mm
CM, ///< Centimeter = 10mm = 2.371pc
IN, ///< Inch = 25.4mm = 72.27pt = 6.022pc
EX, ///< Height of a small "x" for the current font.
EM, ///< Width of capital "M" in current font.
MU, ///< Math unit (18mu = 1em) for positioning in math mode
PTW, //< Percent of TextWidth
PCW, //< Percent of ColumnWidth
PPW, //< Percent of PageWidth
PLW, //< Percent of LineWidth
PTH, //< Percent of TextHeight // Herbert 2002-05-16
PPH, //< Percent of PaperHeight // Herbert 2002-05-16
UNIT_NONE ///< no unit
};
///
LyXLength();
///
LyXLength(double v, LyXLength::UNIT u);
/// "data" must be a decimal number, followed by a unit
explicit LyXLength(string const & data);
///
double value() const;
///
LyXLength::UNIT unit() const;
///
void value(double);
///
void unit(LyXLength::UNIT unit);
///
bool zero() const;
///
bool empty() const;
/// return string representation
string const asString() const;
/// return string representation for LaTeX
string const asLatexString() const;
/// return the on-screen size of this length
int inPixels(int text_width, int em_width = 0) const;
/// return the on-screen size of this length of an image
int inBP() const;
/** If "data" is valid, the length represented by it is
stored into "result", if that is not 0. */
friend bool isValidLength(string const & data, LyXLength * result = 0);
private:
///
double val_;
///
LyXLength::UNIT unit_;
};
///
bool operator==(LyXLength const & l1, LyXLength const & l2);
///
bool operator!=(LyXLength const & l1, LyXLength const & l2);
///
bool isValidLength(string const & data, LyXLength * result);
/// return the name of the given unit number
char const * stringFromUnit(int unit);
#endif // LYXLENGTH_H