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"
25 using std::ostringstream;
29 LyXLength::LyXLength()
30 : val_(0), unit_(LyXLength::UNIT_NONE)
34 LyXLength::LyXLength(double v, LyXLength::UNIT u)
39 LyXLength::LyXLength(string const & data)
40 : val_(0), unit_(LyXLength::PT)
44 if (!isValidLength(data, &tmp))
45 return; // should raise an exception
52 string const LyXLength::asString() const
55 os << val_ << unit_name[unit_]; // setw?
60 string const LyXLength::asLatexString() const
65 snprintf(buffer, 78, "%.2f\\textwidth", val_/100.0);
68 snprintf(buffer, 78, "%.2f\\columnwidth", val_/100.0);
71 snprintf(buffer, 78, "%.2f\\paperwidth", val_/100.0);
74 snprintf(buffer, 78, "%.2f\\linewidth", val_/100.0);
77 snprintf(buffer, 78, "%.2f\\paperheight", val_/100.0);
80 snprintf(buffer, 78, "%.2f\\textheight", val_/100.0);
83 snprintf(buffer, 78, "%f%s", val_, unit_name[unit_]);
92 double LyXLength::value() const
98 LyXLength::UNIT LyXLength::unit() const
104 void LyXLength::value(double v)
110 void LyXLength::unit(LyXLength::UNIT u)
116 bool LyXLength::zero() const
122 bool LyXLength::empty() const
124 return unit_ == LyXLength::UNIT_NONE;
128 int LyXLength::inPixels(int text_width, int em_width_base) const
130 // Zoom factor specified by user in percent
131 double const zoom = lyxrc.zoom / 100.0; // [percent]
133 // DPI setting for monitor: pixels/inch
134 double const dpi = lyxrc.dpi; // screen resolution [pixels/inch]
136 double const em_width = (em_width_base > 0)
138 : 10*(dpi/72.27)*zoom;
139 // A different estimate for em_width is
140 // font_metrics::width('M', LyXFont(LyXFont::ALL_SANE))
141 // but this estimate might not be more accurate as the screen font
142 // is different then the latex font.
144 // Pixel values are scaled so that the ratio
145 // between lengths and font sizes on the screen
146 // is the same as on paper.
152 // Scaled point: sp = 1/65536 pt
153 result = zoom * dpi * val_
154 / (72.27 * 65536); // 4736286.7
157 // Point: 1 pt = 1/72.27 inch
158 result = zoom * dpi * val_
162 // Big point: 1 bp = 1/72 inch
163 result = zoom * dpi * val_
167 // Didot: 1157dd = 1238 pt?
168 result = zoom * dpi * val_
169 / (72.27 / (0.376 * 2.845)); // 67.559735
172 // Millimeter: 1 mm = 1/25.4 inch
173 result = zoom * dpi * val_
177 // Pica: 1 pc = 12 pt
178 result = zoom * dpi * val_
179 / (72.27 / 12); // 6.0225
182 // Cicero: 1 cc = 12 dd
183 result = zoom * dpi * val_
184 / (72.27 / (12 * 0.376 * 2.845)); // 5.6299779
187 // Centimeter: 1 cm = 1/2.54 inch
188 result = zoom * dpi * val_
193 result = zoom * dpi * val_;
196 // Ex: The height of an "x"
197 // 0.4305 is the ration between 1ex and 1em in cmr10
198 result = val_ * em_width * 0.4305;
201 // Em: The width of an "m"
202 result = val_ * em_width;
205 // math unit = 1/18em
206 result = val_ * em_width / 18;
208 case LyXLength::PCW: // Always % of workarea
211 result = val_ * text_width / 100;
214 // paperwidth/textwidth is 1.7 for A4 paper with default margins
215 result = val_ * text_width * 1.7 / 100;
218 result = val_ * text_width * 1.787 / 100;
221 result = val_ * text_width * 2.2 / 100;
223 case LyXLength::UNIT_NONE:
224 result = 0; // this cannot happen
227 return static_cast<int>(result + ((result >= 0) ? 0.5 : -0.5));
231 int LyXLength::inBP() const
233 // return any LyXLength value as a one with
234 // the PostScript point, called bp (big points)
239 result = val_ * 28.346;
243 result = val_ * 2.8346;
247 result = val_ * 72.0;
250 // no other than bp possible
254 return static_cast<int>(result + 0.5);
258 bool operator==(LyXLength const & l1, LyXLength const & l2)
260 return l1.value() == l2.value() && l1.unit() == l2.unit();
264 bool operator!=(LyXLength const & l1, LyXLength const & l2)