-/* 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 <config.h>
-#ifdef __GNUG__
-#pragma implementation
-#endif
-
#include "lyxlength.h"
+#include "lengthcommon.h"
+#include "lyxrc.h"
-#include "Lsstream.h"
-
-#if defined(__GNUG__) && __GNUC__ == 2 && __GNUC_MINOR__ >= 95
-#include <cstdlib>
-#else
-#include <cmath>
-#endif
-
-namespace {
-// this is now here and in lyxgluelength.C
-
-int const num_units = LyXLength::UNIT_NONE;
-
-// I am not sure if "mu" should be possible to select (Lgb)
-char const * unit_name[num_units] = { "sp", "pt", "bp", "dd",
- "mm", "pc", "cc", "cm",
- "in", "ex", "em", "mu",
- "%", "c%", "p%", "l%" };
+#include <sstream>
+#include <iomanip>
-LyXLength::UNIT unitFromString(string const & data)
-{
- int i = 0;
- while (i < num_units && data != unit_name[i])
- ++i;
- return static_cast<LyXLength::UNIT>(i);
-}
-
-}
+using std::ostringstream;
+using std::string;
LyXLength::LyXLength()
- : val_(0), unit_(LyXLength::PT)
+ : val_(0), unit_(LyXLength::UNIT_NONE)
{}
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_;
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<int>(val_/100)) << "."
- << abs(static_cast<int>(val_)%100) << "\\columnwidth";
- break;
- case PP:
- buffer << abs(static_cast<int>(val_/100)) << "."
- << abs(static_cast<int>(val_)%100) << "\\pagewidth";
- break;
- case PL:
- buffer << abs(static_cast<int>(val_/100)) << "."
- << abs(static_cast<int>(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();
}
}
+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<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);
+}
projects / lyx.git / blobdiff