3 * This file is part of LyX, the document processor.
4 * Licence details can be found in the file COPYING.
6 * \author Matthias Ettrich
7 * \author Lars Gullik Bjønnes
8 * \author Jean-Marc Lasgouttes
9 * \author Angus Leeming
13 * Full author contact details are available in file CREDITS.
18 #include "lyxlength.h"
19 #include "lengthcommon.h"
29 using std::ostringstream;
33 LyXLength::LyXLength()
34 : val_(0), unit_(LyXLength::UNIT_NONE)
38 LyXLength::LyXLength(double v, LyXLength::UNIT u)
43 LyXLength::LyXLength(string const & data)
44 : val_(0), unit_(LyXLength::PT)
48 if (!isValidLength(data, &tmp))
49 return; // should raise an exception
56 string const LyXLength::asString() const
59 os << val_ << unit_name[unit_]; // setw?
64 string const LyXLength::asLatexString() const
69 os << val_ / 100.0 << "\\textwidth";
72 os << val_ / 100.0 << "\\columnwidth";
75 os << val_ / 100.0 << "\\paperwidth";
78 os << val_ / 100.0 << "\\linewidth";
81 os << val_ / 100.0 << "\\paperheight";
84 os << val_ / 100.0 << "\\textheight";
87 os << val_ << unit_name[unit_];
94 double LyXLength::value() const
100 LyXLength::UNIT LyXLength::unit() const
106 void LyXLength::value(double v)
112 void LyXLength::unit(LyXLength::UNIT u)
118 bool LyXLength::zero() const
124 bool LyXLength::empty() const
126 return unit_ == LyXLength::UNIT_NONE;
130 int LyXLength::inPixels(int text_width, int em_width_base) const
132 // Zoom factor specified by user in percent
133 double const zoom = lyxrc.zoom / 100.0; // [percent]
135 // DPI setting for monitor: pixels/inch
136 double const dpi = lyxrc.dpi; // screen resolution [pixels/inch]
138 double const em_width = (em_width_base > 0)
140 : 10*(dpi/72.27)*zoom;
141 // A different estimate for em_width is
142 // theFontMetrics(LyXFont(LyXFont::ALL_SANE)).width('M')
143 // but this estimate might not be more accurate as the screen font
144 // is different then the latex font.
146 // Pixel values are scaled so that the ratio
147 // between lengths and font sizes on the screen
148 // is the same as on paper.
154 // Scaled point: sp = 1/65536 pt
155 result = zoom * dpi * val_
156 / (72.27 * 65536); // 4736286.7
159 // Point: 1 pt = 1/72.27 inch
160 result = zoom * dpi * val_
164 // Big point: 1 bp = 1/72 inch
165 result = zoom * dpi * val_
169 // Didot: 1157dd = 1238 pt?
170 result = zoom * dpi * val_
171 / (72.27 / (0.376 * 2.845)); // 67.559735
174 // Millimeter: 1 mm = 1/25.4 inch
175 result = zoom * dpi * val_
179 // Pica: 1 pc = 12 pt
180 result = zoom * dpi * val_
181 / (72.27 / 12); // 6.0225
184 // Cicero: 1 cc = 12 dd
185 result = zoom * dpi * val_
186 / (72.27 / (12 * 0.376 * 2.845)); // 5.6299779
189 // Centimeter: 1 cm = 1/2.54 inch
190 result = zoom * dpi * val_
195 result = zoom * dpi * val_;
198 // Ex: The height of an "x"
199 // 0.4305 is the ration between 1ex and 1em in cmr10
200 result = val_ * em_width * 0.4305;
203 // Em: The width of an "m"
204 result = val_ * em_width;
207 // math unit = 1/18em
208 result = val_ * em_width / 18;
210 case LyXLength::PCW: // Always % of workarea
213 result = val_ * text_width / 100;
216 // paperwidth/textwidth is 1.7 for A4 paper with default margins
217 result = val_ * text_width * 1.7 / 100;
220 result = val_ * text_width * 1.787 / 100;
223 result = val_ * text_width * 2.2 / 100;
225 case LyXLength::UNIT_NONE:
226 result = 0; // this cannot happen
229 return static_cast<int>(result + ((result >= 0) ? 0.5 : -0.5));
233 int LyXLength::inBP() const
235 // return any LyXLength value as a one with
236 // the PostScript point, called bp (big points)
241 result = val_ * 28.346;
245 result = val_ * 2.8346;
249 result = val_ * 72.0;
252 // no other than bp possible
256 return static_cast<int>(result + 0.5);
260 bool operator==(LyXLength const & l1, LyXLength const & l2)
262 return l1.value() == l2.value() && l1.unit() == l2.unit();
266 bool operator!=(LyXLength const & l1, LyXLength const & l2)