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"
26 using std::ostringstream;
30 LyXLength::LyXLength()
31 : val_(0), unit_(LyXLength::UNIT_NONE)
35 LyXLength::LyXLength(double v, LyXLength::UNIT u)
40 LyXLength::LyXLength(string const & data)
41 : val_(0), unit_(LyXLength::PT)
45 if (!isValidLength(data, &tmp))
46 return; // should raise an exception
53 string const LyXLength::asString() const
56 os << val_ << unit_name[unit_]; // setw?
61 string const LyXLength::asLatexString() const
66 os << val_ / 100.0 << "\\textwidth";
69 os << val_ / 100.0 << "\\columnwidth";
72 os << val_ / 100.0 << "\\paperwidth";
75 os << val_ / 100.0 << "\\linewidth";
78 os << val_ / 100.0 << "\\paperheight";
81 os << val_ / 100.0 << "\\textheight";
84 os << val_ << unit_name[unit_];
91 double LyXLength::value() const
97 LyXLength::UNIT LyXLength::unit() const
103 void LyXLength::value(double v)
109 void LyXLength::unit(LyXLength::UNIT u)
115 bool LyXLength::zero() const
121 bool LyXLength::empty() const
123 return unit_ == LyXLength::UNIT_NONE;
127 int LyXLength::inPixels(int text_width, int em_width_base) const
129 // Zoom factor specified by user in percent
130 double const zoom = lyxrc.zoom / 100.0; // [percent]
132 // DPI setting for monitor: pixels/inch
133 double const dpi = lyxrc.dpi; // screen resolution [pixels/inch]
135 double const em_width = (em_width_base > 0)
137 : 10*(dpi/72.27)*zoom;
138 // A different estimate for em_width is
139 // font_metrics::width('M', LyXFont(LyXFont::ALL_SANE))
140 // but this estimate might not be more accurate as the screen font
141 // is different then the latex font.
143 // Pixel values are scaled so that the ratio
144 // between lengths and font sizes on the screen
145 // is the same as on paper.
151 // Scaled point: sp = 1/65536 pt
152 result = zoom * dpi * val_
153 / (72.27 * 65536); // 4736286.7
156 // Point: 1 pt = 1/72.27 inch
157 result = zoom * dpi * val_
161 // Big point: 1 bp = 1/72 inch
162 result = zoom * dpi * val_
166 // Didot: 1157dd = 1238 pt?
167 result = zoom * dpi * val_
168 / (72.27 / (0.376 * 2.845)); // 67.559735
171 // Millimeter: 1 mm = 1/25.4 inch
172 result = zoom * dpi * val_
176 // Pica: 1 pc = 12 pt
177 result = zoom * dpi * val_
178 / (72.27 / 12); // 6.0225
181 // Cicero: 1 cc = 12 dd
182 result = zoom * dpi * val_
183 / (72.27 / (12 * 0.376 * 2.845)); // 5.6299779
186 // Centimeter: 1 cm = 1/2.54 inch
187 result = zoom * dpi * val_
192 result = zoom * dpi * val_;
195 // Ex: The height of an "x"
196 // 0.4305 is the ration between 1ex and 1em in cmr10
197 result = val_ * em_width * 0.4305;
200 // Em: The width of an "m"
201 result = val_ * em_width;
204 // math unit = 1/18em
205 result = val_ * em_width / 18;
207 case LyXLength::PCW: // Always % of workarea
210 result = val_ * text_width / 100;
213 // paperwidth/textwidth is 1.7 for A4 paper with default margins
214 result = val_ * text_width * 1.7 / 100;
217 result = val_ * text_width * 1.787 / 100;
220 result = val_ * text_width * 2.2 / 100;
222 case LyXLength::UNIT_NONE:
223 result = 0; // this cannot happen
226 return static_cast<int>(result + ((result >= 0) ? 0.5 : -0.5));
230 int LyXLength::inBP() const
232 // return any LyXLength value as a one with
233 // the PostScript point, called bp (big points)
238 result = val_ * 28.346;
242 result = val_ * 2.8346;
246 result = val_ * 72.0;
249 // no other than bp possible
253 return static_cast<int>(result + 0.5);
257 bool operator==(LyXLength const & l1, LyXLength const & l2)
259 return l1.value() == l2.value() && l1.unit() == l2.unit();
263 bool operator!=(LyXLength const & l1, LyXLength const & l2)