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a5263e0f92
hope there are only conforming implementaions out there ;-} git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@21312 a592a061-630c-0410-9148-cb99ea01b6c8
414 lines
7.7 KiB
C++
414 lines
7.7 KiB
C++
/**
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* \file Length.cpp
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Matthias Ettrich
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* \author Lars Gullik Bjønnes
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* \author Jean-Marc Lasgouttes
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* \author Angus Leeming
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* \author John Levon
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* \author Dekel Tsur
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*
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* Full author contact details are available in file CREDITS.
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*/
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#include <config.h>
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#include "Length.h"
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#include "LyXRC.h"
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#include "support/docstream.h"
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#include <sstream>
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#include <iomanip>
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namespace lyx {
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using std::ostringstream;
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using std::string;
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/////////////////////////////////////////////////////////////////////
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//
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// Length
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//
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/////////////////////////////////////////////////////////////////////
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Length::Length()
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: val_(0), unit_(Length::UNIT_NONE)
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{}
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Length::Length(double v, Length::UNIT u)
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: val_(v), unit_(u)
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{}
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Length::Length(string const & data)
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: val_(0), unit_(Length::PT)
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{
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Length tmp;
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if (!isValidLength(data, &tmp))
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return; // should raise an exception
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val_ = tmp.val_;
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unit_ = tmp.unit_;
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}
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void Length::swap(Length & rhs)
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{
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std::swap(val_, rhs.val_);
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std::swap(unit_, rhs.unit_);
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}
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string const Length::asString() const
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{
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ostringstream os;
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os << val_ << unit_name[unit_]; // setw?
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return os.str();
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}
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docstring const Length::asDocstring() const
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{
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odocstringstream os;
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os << val_ << unit_name[unit_]; // setw?
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return os.str();
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}
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string const Length::asLatexString() const
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{
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ostringstream os;
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switch (unit_) {
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case PTW:
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os << val_ / 100.0 << "\\textwidth";
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break;
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case PCW:
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os << val_ / 100.0 << "\\columnwidth";
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break;
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case PPW:
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os << val_ / 100.0 << "\\paperwidth";
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break;
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case PLW:
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os << val_ / 100.0 << "\\linewidth";
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break;
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case PPH:
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os << val_ / 100.0 << "\\paperheight";
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break;
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case PTH:
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os << val_ / 100.0 << "\\textheight";
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break;
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default:
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os << val_ << unit_name[unit_];
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break;
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}
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return os.str();
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}
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double Length::value() const
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{
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return val_;
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}
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Length::UNIT Length::unit() const
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{
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return unit_;
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}
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void Length::value(double v)
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{
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val_ = v;
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}
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void Length::unit(Length::UNIT u)
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{
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unit_ = u;
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}
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bool Length::zero() const
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{
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return val_ == 0.0;
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}
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bool Length::empty() const
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{
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return unit_ == Length::UNIT_NONE;
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}
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int Length::inPixels(int text_width, int em_width_base) const
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{
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// Zoom factor specified by user in percent
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double const zoom = lyxrc.zoom / 100.0; // [percent]
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// DPI setting for monitor: pixels/inch
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double const dpi = lyxrc.dpi; // screen resolution [pixels/inch]
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double const em_width = (em_width_base > 0)
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? em_width_base
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: 10*(dpi/72.27)*zoom;
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// A different estimate for em_width is
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// theFontMetrics(FontInfo(sane_font)).width('M')
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// but this estimate might not be more accurate as the screen font
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// is different then the latex font.
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// Pixel values are scaled so that the ratio
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// between lengths and font sizes on the screen
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// is the same as on paper.
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double result = 0.0;
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switch (unit_) {
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case Length::SP:
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// Scaled point: sp = 1/65536 pt
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result = zoom * dpi * val_
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/ (72.27 * 65536); // 4736286.7
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break;
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case Length::PT:
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// Point: 1 pt = 1/72.27 inch
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result = zoom * dpi * val_
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/ 72.27; // 72.27
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break;
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case Length::BP:
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// Big point: 1 bp = 1/72 inch
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result = zoom * dpi * val_
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/ 72; // 72
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break;
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case Length::DD:
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// Didot: 1157dd = 1238 pt?
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result = zoom * dpi * val_
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/ (72.27 / (0.376 * 2.845)); // 67.559735
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break;
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case Length::MM:
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// Millimeter: 1 mm = 1/25.4 inch
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result = zoom * dpi * val_
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/ 25.4; // 25.4
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break;
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case Length::PC:
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// Pica: 1 pc = 12 pt
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result = zoom * dpi * val_
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/ (72.27 / 12); // 6.0225
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break;
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case Length::CC:
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// Cicero: 1 cc = 12 dd
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result = zoom * dpi * val_
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/ (72.27 / (12 * 0.376 * 2.845)); // 5.6299779
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break;
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case Length::CM:
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// Centimeter: 1 cm = 1/2.54 inch
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result = zoom * dpi * val_
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/ 2.54; // 2.54
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break;
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case Length::IN:
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// Inch
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result = zoom * dpi * val_;
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break;
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case Length::EX:
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// Ex: The height of an "x"
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// 0.4305 is the ration between 1ex and 1em in cmr10
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result = val_ * em_width * 0.4305;
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break;
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case Length::EM:
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// Em: The width of an "m"
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result = val_ * em_width;
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break;
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case Length::MU:
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// math unit = 1/18em
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result = val_ * em_width / 18;
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break;
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case Length::PCW: // Always % of workarea
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case Length::PTW:
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case Length::PLW:
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result = val_ * text_width / 100;
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break;
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case Length::PPW:
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// paperwidth/textwidth is 1.7 for A4 paper with default margins
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result = val_ * text_width * 1.7 / 100;
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break;
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case Length::PTH:
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result = val_ * text_width * 1.787 / 100;
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break;
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case Length::PPH:
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result = val_ * text_width * 2.2 / 100;
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break;
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case Length::UNIT_NONE:
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result = 0; // this cannot happen
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break;
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}
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return static_cast<int>(result + ((result >= 0) ? 0.5 : -0.5));
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}
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int Length::inBP() const
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{
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// return any Length value as a one with
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// the PostScript point, called bp (big points)
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double result = 0.0;
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switch (unit_) {
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case Length::CM:
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// 1bp = 0.2835cm
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result = val_ * 28.346;
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break;
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case Length::MM:
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// 1bp = 0.02835mm
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result = val_ * 2.8346;
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break;
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case Length::IN:
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// 1pt = 1/72in
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result = val_ * 72.0;
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break;
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default:
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// no other than bp possible
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result = val_;
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break;
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}
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return static_cast<int>(result + 0.5);
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}
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bool operator==(Length const & l1, Length const & l2)
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{
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return l1.value() == l2.value() && l1.unit() == l2.unit();
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}
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bool operator!=(Length const & l1, Length const & l2)
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{
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return !(l1 == l2);
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}
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/////////////////////////////////////////////////////////////////////
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//
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// GlueLength
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//
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/////////////////////////////////////////////////////////////////////
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GlueLength::GlueLength(Length const & len)
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: len_(len)
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{}
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GlueLength::GlueLength(Length const & len, Length const & plus,
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Length const & minus)
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: len_(len), plus_(plus), minus_(minus)
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{}
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GlueLength::GlueLength(string const & data)
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{
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isValidGlueLength(data, this);
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}
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string const GlueLength::asString() const
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{
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ostringstream buffer;
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buffer << len_.value();
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if (plus_.zero() && minus_.zero()) {
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buffer << unit_name[len_.unit()];
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return buffer.str();
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}
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// just len and plus
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if (minus_.zero()) {
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if (len_.unit() != plus_.unit())
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buffer << unit_name[len_.unit()];
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buffer << '+' << plus_.value();
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buffer << unit_name[plus_.unit()];
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return buffer.str();
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}
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// just len and minus
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if (plus_.zero()) {
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if (len_.unit() != minus_.unit())
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buffer << unit_name[len_.unit()];
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buffer << '-' << minus_.value();
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buffer << unit_name[minus_.unit()];
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return buffer.str();
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}
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// ok, len, plus AND minus
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// len+-
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if (minus_ == plus_) {
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if (len_.unit() != minus_.unit())
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buffer << unit_name[len_.unit()];
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buffer << "+-" << minus_.value();
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buffer << unit_name[minus_.unit()];
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return buffer.str();
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}
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// this is so rare a case, why bother minimising units ?
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buffer << unit_name[len_.unit()];
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buffer << '+' << plus_.value() << unit_name[plus_.unit()];
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buffer << '-' << minus_.value() << unit_name[minus_.unit()];
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return buffer.str();
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}
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string const GlueLength::asLatexString() const
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{
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ostringstream buffer;
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buffer << len_.value() << unit_name[len_.unit()];
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if (!plus_.zero())
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buffer << " plus " << plus_.value() << unit_name[plus_.unit()];
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if (!minus_.zero())
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buffer << " minus " << minus_.value() << unit_name[minus_.unit()];
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return buffer.str();
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}
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Length const & GlueLength::len() const
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{
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return len_;
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}
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Length const & GlueLength::plus() const
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{
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return plus_;
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}
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Length const & GlueLength::minus() const
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{
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return minus_;
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}
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bool operator==(GlueLength const & l1, GlueLength const & l2)
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{
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return l1.len() == l2.len()
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&& l1.plus() == l2.plus()
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&& l1.minus() == l2.minus();
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}
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bool operator!=(GlueLength const & l1, GlueLength const & l2)
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{
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return !(l1 == l2);
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}
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} // namespace lyx
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