src/lyxlength.C

   1 /* This file is part of
   2  * ======================================================
   3  *
   4  *           LyX, The Document Processor
   5  *
   6  *           Copyright 1995 Matthias Ettrich
   7  *           Copyright 1995-2001 The LyX Team.
   8  *
   9  * ====================================================== */
  10
  11 #include <config.h>
  12
  13 #ifdef __GNUG__
  14 #pragma implementation
  15 #endif
  16
  17 #include "lyxlength.h"
  18 #include "lengthcommon.h"
  19 #include "lyxrc.h"
  20
  21 #include "support/lstrings.h"
  22
  23 #include "Lsstream.h"
  24
  25 #include <cstdlib>
  26
  27 using std::abs;
  28
  29 LyXLength::LyXLength()
  30         : val_(0), unit_(LyXLength::PT)
  31 {}
  32
  33
  34 LyXLength::LyXLength(double v, LyXLength::UNIT u)
  35         : val_(v), unit_(u)
  36 {}
  37
  38
  39 LyXLength::LyXLength(string const & data)
  40         : val_(0), unit_(LyXLength::PT)
  41 {
  42         LyXLength tmp;
  43
  44         if (!isValidLength(data, &tmp))
  45                 return; // should raise an exception
  46
  47         val_  = tmp.val_;
  48         unit_ = tmp.unit_;
  49 }
  50
  51
  52 string const LyXLength::asString() const
  53 {
  54         ostringstream buffer;
  55         buffer << val_ << unit_name[unit_]; // setw?
  56         return buffer.str().c_str();
  57 }
  58
  59
  60 string const LyXLength::asLatexString() const
  61 {
  62         ostringstream buffer;
  63         switch (unit_) {
  64         case PTW:
  65             buffer << abs(static_cast<int>(val_/100)) << "."
  66                    << abs(static_cast<int>(val_)%100) << "\\textwidth";
  67             break;
  68         case PCW:
  69             buffer << abs(static_cast<int>(val_/100)) << "."
  70                    << abs(static_cast<int>(val_)%100) << "\\columnwidth";
  71             break;
  72         case PPW:
  73             buffer << abs(static_cast<int>(val_/100)) << "."
  74                    << abs(static_cast<int>(val_)%100) << "\\paperwidth";
  75             break;
  76         case PLW:
  77             buffer << abs(static_cast<int>(val_/100)) << "."
  78                    << abs(static_cast<int>(val_)%100) << "\\linewidth";
  79             break;
  80         case PPH:
  81             buffer << abs(static_cast<int>(val_/100)) << "."
  82                    << abs(static_cast<int>(val_)%100) << "\\paperheight";
  83             break;
  84         case PTH:
  85             buffer << abs(static_cast<int>(val_/100)) << "."
  86                    << abs(static_cast<int>(val_)%100) << "\\textheight";
  87             break;
  88         default:
  89             buffer << val_ << unit_name[unit_]; // setw?
  90             break;
  91         }
  92         return buffer.str().c_str();
  93 }
  94
  95
  96 double LyXLength::value() const
  97 {
  98         return val_;
  99 }
 100
 101
 102 LyXLength::UNIT LyXLength::unit() const
 103 {
 104         return unit_;
 105 }
 106
 107
 108 void LyXLength::value(double v)
 109 {
 110         val_ = v;
 111 }
 112
 113
 114 void LyXLength::unit(LyXLength::UNIT u)
 115 {
 116         unit_ = u;
 117 }
 118
 119
 120 bool LyXLength::zero() const
 121 {
 122         return val_ == 0.0;
 123 }
 124
 125
 126 int LyXLength::inPixels(int default_width, int default_height) const
 127 {
 128         // Zoom factor specified by user in percent
 129         double const zoom = lyxrc.zoom / 100.0; // [percent]
 130
 131         // DPI setting for monitor: pixels/inch
 132         double const dpi = lyxrc.dpi; // screen resolution [pixels/inch]
 133
 134         // Pixel values are scaled so that the ratio
 135         // between lengths and font sizes on the screen
 136         // is the same as on paper.
 137
 138         // we don't care about sign of value, we
 139         // display negative space with text too
 140 #ifdef WITH_WARNINGS
 141 #warning if you don't care than either call this function differently or let it return negative values and call abs() explicitly when needed (Andre')
 142 #endif
 143
 144         double result = 0.0;
 145
 146         switch (unit_) {
 147         case LyXLength::SP:
 148                 // Scaled point: sp = 1/65536 pt
 149                 result = zoom * dpi * val_
 150                         / (72.27 * 65536); // 4736286.7
 151                 break;
 152         case LyXLength::PT:
 153                 // Point: 1 pt = 1/72.27 inch
 154                 result = zoom * dpi * val_
 155                         / 72.27; // 72.27
 156                 break;
 157         case LyXLength::BP:
 158                 // Big point: 1 bp = 1/72 inch
 159                 result = zoom * dpi * val_
 160                         / 72; // 72
 161                 break;
 162         case LyXLength::DD:
 163                 // Didot: 1157dd = 1238 pt?
 164                 result = zoom * dpi * val_
 165                         / (72.27 / (0.376 * 2.845)); // 67.559735
 166                 break;
 167         case LyXLength::MM:
 168                 // Millimeter: 1 mm = 1/25.4 inch
 169                 result = zoom * dpi * val_
 170                         / 25.4; // 25.4
 171                 break;
 172         case LyXLength::PC:
 173                 // Pica: 1 pc = 12 pt
 174                 result = zoom * dpi * val_
 175                         / (72.27 / 12); // 6.0225
 176                 break;
 177         case LyXLength::CC:
 178                 // Cicero: 1 cc = 12 dd
 179                 result = zoom * dpi * val_
 180                         / (72.27 / (12 * 0.376 * 2.845)); // 5.6299779
 181                 break;
 182         case LyXLength::CM:
 183                 // Centimeter: 1 cm = 1/2.54 inch
 184                 result = zoom * dpi * val_
 185                         / 2.54; // 2.54
 186                 break;
 187         case LyXLength::IN:
 188                 // Inch
 189                 result = zoom * dpi * val_;
 190                 break;
 191         case LyXLength::EX:
 192                 // Ex: The height of an "x"
 193                 // 0.4305 is the ration between 1ex and 1em in cmr10
 194                 result = zoom * val_ * default_height * 0.4305;
 195                 break;
 196         case LyXLength::EM:
 197                 // Em: The width of an "m"
 198                 // 1em is approx 10points in cmr10
 199                 result = zoom * val_ * default_height;
 200                 break;
 201         case LyXLength::MU:
 202                 // math unit = 1/18em
 203                 result = val_ * default_height / 18;
 204                 break;
 205         case LyXLength::PCW: // Always % of workarea
 206         case LyXLength::PTW:
 207         case LyXLength::PPW:
 208         case LyXLength::PLW:
 209                 result = val_ * default_width / 100;
 210                 break;
 211         case LyXLength::PTH:
 212         case LyXLength::PPH:
 213                 result = val_ * default_height / 100;
 214                 break;
 215         case LyXLength::UNIT_NONE:
 216                 result = 0;  // this cannot happen
 217                 break;
 218         }
 219         return static_cast<int>(result + ((result >= 0) ? 0.5 : -0.5));
 220 }
 221
 222
 223 int LyXLength::inBP() const
 224 {
 225         // return any LyXLength value as a one with
 226         // the PostScript point, called bp (big points)
 227         double result = 0.0;
 228         switch (unit_) {
 229         case LyXLength::CM:
 230                 // 1bp = 0.2835cm
 231                 result = val_ * 28.346;
 232                 break;
 233         case LyXLength::MM:
 234                 // 1bp = 0.02835mm
 235                 result = val_ * 2.8346;
 236                 break;
 237         case LyXLength::IN:
 238                 // 1pt = 1/72in
 239                 result = val_ * 72.0;
 240                 break;
 241         default:
 242                 // no other than bp possible
 243                 result = val_;
 244                 break;
 245         }
 246         return static_cast<int>(result + 0.5);
 247 }
 248
 249
 250 bool operator==(LyXLength const & l1, LyXLength const & l2)
 251 {
 252         return l1.value() == l2.value() && l1.unit() == l2.unit();
 253 }
 254
 255
 256 bool operator!=(LyXLength const & l1, LyXLength const & l2)
 257 {
 258         return !(l1 == l2);
 259 }