X-Git-Url: https://git.lyx.org/gitweb/?a=blobdiff_plain;f=src%2Flyxlength.C;h=70a8aaad4204d20c66f3ec7a7b6330bc8c2fc357;hb=65ca7003ba47b7348610393a9a0d2d309b4e9702;hp=c1e08dd4448746a8036f8495098470712d3a351c;hpb=f685bb40cb12a43096b88ee06e747f6f1b63faab;p=lyx.git diff --git a/src/lyxlength.C b/src/lyxlength.C index c1e08dd444..70a8aaad42 100644 --- a/src/lyxlength.C +++ b/src/lyxlength.C @@ -1,29 +1,34 @@ -/* This file is part of - * ====================================================== +/** + * \file lyxlength.C + * This file is part of LyX, the document processor. + * Licence details can be found in the file COPYING. * - * LyX, The Document Processor - * - * Copyright 1995 Matthias Ettrich - * Copyright 1995-2001 The LyX Team. + * \author Matthias Ettrich + * \author Lars Gullik Bjønnes + * \author Jean-Marc Lasgouttes + * \author Angus Leeming + * \author John Levon + * \author Dekel Tsur * - * ====================================================== */ + * Full author contact details are available in file CREDITS. + */ #include -#ifdef __GNUG__ -#pragma implementation -#endif - #include "lyxlength.h" #include "lengthcommon.h" +#include "lyxrc.h" + +#include +#include -#include "Lsstream.h" -#include +using std::ostringstream; +using std::string; LyXLength::LyXLength() - : val_(0), unit_(LyXLength::PT) + : val_(0), unit_(LyXLength::UNIT_NONE) {} @@ -36,8 +41,8 @@ LyXLength::LyXLength(string const & data) : val_(0), unit_(LyXLength::PT) { LyXLength tmp; - - if (!isValidLength (data, &tmp)) + + if (!isValidLength(data, &tmp)) return; // should raise an exception val_ = tmp.val_; @@ -47,34 +52,39 @@ LyXLength::LyXLength(string const & data) string const LyXLength::asString() const { - ostringstream buffer; - buffer << val_ << unit_name[unit_]; // setw? - return buffer.str().c_str(); + ostringstream os; + os << val_ << unit_name[unit_]; // setw? + return os.str(); } string const LyXLength::asLatexString() const { - ostringstream buffer; - switch(unit_) { - case PW: - case PE: - buffer << abs(static_cast(val_/100)) << "." - << abs(static_cast(val_)%100) << "\\columnwidth"; - break; - case PP: - buffer << abs(static_cast(val_/100)) << "." - << abs(static_cast(val_)%100) << "\\pagewidth"; - break; - case PL: - buffer << abs(static_cast(val_/100)) << "." - << abs(static_cast(val_)%100) << "\\linewidth"; - break; + ostringstream os; + switch (unit_) { + case PTW: + os << val_ / 100.0 << "\\textwidth"; + break; + case PCW: + os << val_ / 100.0 << "\\columnwidth"; + break; + case PPW: + os << val_ / 100.0 << "\\paperwidth"; + break; + case PLW: + os << val_ / 100.0 << "\\linewidth"; + break; + case PPH: + os << val_ / 100.0 << "\\paperheight"; + break; + case PTH: + os << val_ / 100.0 << "\\textheight"; + break; default: - buffer << val_ << unit_name[unit_]; // setw? - break; + os << val_ << unit_name[unit_]; + break; } - return buffer.str().c_str(); + return os.str(); } @@ -102,12 +112,148 @@ void LyXLength::unit(LyXLength::UNIT u) } -bool LyXLength::zero() const +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. + + 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(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(result + 0.5); +} + + bool operator==(LyXLength const & l1, LyXLength const & l2) { return l1.value() == l2.value() && l1.unit() == l2.unit(); @@ -118,4 +264,3 @@ bool operator!=(LyXLength const & l1, LyXLength const & l2) { return !(l1 == l2); } -