lyx_mirror/src/lyxlength.C

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/* This file is part of
* ======================================================
*
* LyX, The Document Processor
*
* Copyright 1995 Matthias Ettrich
* Copyright 1995-2001 The LyX Team.
*
* ====================================================== */
#include <config.h>
#include "lyxlength.h"
#include "lengthcommon.h"
#include "lyxrc.h"
#include "support/lstrings.h"
#include "Lsstream.h"
#include <cstdlib>
using std::abs;
LyXLength::LyXLength()
: val_(0), unit_(LyXLength::UNIT_NONE)
{}
LyXLength::LyXLength(double v, LyXLength::UNIT u)
: val_(v), unit_(u)
{}
LyXLength::LyXLength(string const & data)
: val_(0), unit_(LyXLength::PT)
{
LyXLength tmp;
if (!isValidLength(data, &tmp))
return; // should raise an exception
val_ = tmp.val_;
unit_ = tmp.unit_;
}
string const LyXLength::asString() const
{
ostringstream buffer;
buffer << val_ << unit_name[unit_]; // setw?
return STRCONV(buffer.str());
}
string const LyXLength::asLatexString() const
{
ostringstream buffer;
switch (unit_) {
case PTW:
buffer << abs(static_cast<int>(val_/100)) << '.'
<< abs(static_cast<int>(val_)%100) << "\\textwidth";
break;
case PCW:
buffer << abs(static_cast<int>(val_/100)) << '.'
<< abs(static_cast<int>(val_)%100) << "\\columnwidth";
break;
case PPW:
buffer << abs(static_cast<int>(val_/100)) << '.'
<< abs(static_cast<int>(val_)%100) << "\\paperwidth";
break;
case PLW:
buffer << abs(static_cast<int>(val_/100)) << '.'
<< abs(static_cast<int>(val_)%100) << "\\linewidth";
break;
case PPH:
buffer << abs(static_cast<int>(val_/100)) << '.'
<< abs(static_cast<int>(val_)%100) << "\\paperheight";
break;
case PTH:
buffer << abs(static_cast<int>(val_/100)) << '.'
<< abs(static_cast<int>(val_)%100) << "\\textheight";
break;
default:
buffer << val_ << unit_name[unit_]; // setw?
break;
}
return STRCONV(buffer.str());
}
double LyXLength::value() const
{
return val_;
}
LyXLength::UNIT LyXLength::unit() const
{
return unit_;
}
void LyXLength::value(double v)
{
val_ = v;
}
void LyXLength::unit(LyXLength::UNIT u)
{
unit_ = u;
}
bool LyXLength::zero() const
{
return val_ == 0.0;
}
bool LyXLength::empty() const
{
return unit_ == LyXLength::UNIT_NONE;
}
int LyXLength::inPixels(int text_width, int em_width_base) const
{
// Zoom factor specified by user in percent
double const zoom = lyxrc.zoom / 100.0; // [percent]
// DPI setting for monitor: pixels/inch
double const dpi = lyxrc.dpi; // screen resolution [pixels/inch]
double const em_width = (em_width_base > 0)
? em_width_base
: 10*(dpi/72.27)*zoom;
// A different estimate for em_width is
// font_metrics::width('M', LyXFont(LyXFont::ALL_SANE))
// but this estimate might not be more accurate as the screen font
// is different then the latex font.
// Pixel values are scaled so that the ratio
// between lengths and font sizes on the screen
// is the same as on paper.
#ifdef WITH_WARNINGS
#warning if you don't care than either call this function differently or let it return negative values and call abs() explicitly when needed (Andre')
#endif
double result = 0.0;
switch (unit_) {
case LyXLength::SP:
// Scaled point: sp = 1/65536 pt
result = zoom * dpi * val_
/ (72.27 * 65536); // 4736286.7
break;
case LyXLength::PT:
// Point: 1 pt = 1/72.27 inch
result = zoom * dpi * val_
/ 72.27; // 72.27
break;
case LyXLength::BP:
// Big point: 1 bp = 1/72 inch
result = zoom * dpi * val_
/ 72; // 72
break;
case LyXLength::DD:
// Didot: 1157dd = 1238 pt?
result = zoom * dpi * val_
/ (72.27 / (0.376 * 2.845)); // 67.559735
break;
case LyXLength::MM:
// Millimeter: 1 mm = 1/25.4 inch
result = zoom * dpi * val_
/ 25.4; // 25.4
break;
case LyXLength::PC:
// Pica: 1 pc = 12 pt
result = zoom * dpi * val_
/ (72.27 / 12); // 6.0225
break;
case LyXLength::CC:
// Cicero: 1 cc = 12 dd
result = zoom * dpi * val_
/ (72.27 / (12 * 0.376 * 2.845)); // 5.6299779
break;
case LyXLength::CM:
// Centimeter: 1 cm = 1/2.54 inch
result = zoom * dpi * val_
/ 2.54; // 2.54
break;
case LyXLength::IN:
// Inch
result = zoom * dpi * val_;
break;
case LyXLength::EX:
// Ex: The height of an "x"
// 0.4305 is the ration between 1ex and 1em in cmr10
result = val_ * em_width * 0.4305;
break;
case LyXLength::EM:
// Em: The width of an "m"
result = val_ * em_width;
break;
case LyXLength::MU:
// math unit = 1/18em
result = val_ * em_width / 18;
break;
case LyXLength::PCW: // Always % of workarea
case LyXLength::PTW:
case LyXLength::PLW:
result = val_ * text_width / 100;
break;
case LyXLength::PPW:
// paperwidth/textwidth is 1.7 for A4 paper with default margins
result = val_ * text_width * 1.7 / 100;
break;
case LyXLength::PTH:
result = val_ * text_width * 1.787 / 100;
break;
case LyXLength::PPH:
result = val_ * text_width * 2.2 / 100;
break;
case LyXLength::UNIT_NONE:
result = 0; // this cannot happen
break;
}
return static_cast<int>(result + ((result >= 0) ? 0.5 : -0.5));
}
int LyXLength::inBP() const
{
// return any LyXLength value as a one with
// the PostScript point, called bp (big points)
double result = 0.0;
switch (unit_) {
case LyXLength::CM:
// 1bp = 0.2835cm
result = val_ * 28.346;
break;
case LyXLength::MM:
// 1bp = 0.02835mm
result = val_ * 2.8346;
break;
case LyXLength::IN:
// 1pt = 1/72in
result = val_ * 72.0;
break;
default:
// no other than bp possible
result = val_;
break;
}
return static_cast<int>(result + 0.5);
}
bool operator==(LyXLength const & l1, LyXLength const & l2)
{
return l1.value() == l2.value() && l1.unit() == l2.unit();
}
bool operator!=(LyXLength const & l1, LyXLength const & l2)
{
return !(l1 == l2);
}