src/vspace.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 "vspace.h"
  15 #endif
  16
  17 #include <stdio.h>
  18
  19 #include "lyx_main.h"
  20 #include "buffer.h"
  21 #include "vspace.h"
  22 #include "lyxrc.h"
  23 #include "lyxtext.h"
  24 #include "BufferView.h"
  25 #include "support/lstrings.h"
  26
  27
  28 namespace {
  29
  30 /*  length units
  31  */
  32
  33 int const num_units = LyXLength::UNIT_NONE;
  34
  35 // I am not sure if "mu" should be possible to select (Lgb)
  36 char const * unit_name[num_units] = { "sp", "pt", "bp", "dd",
  37                                       "mm", "pc", "cc", "cm",
  38                                       "in", "ex", "em", "mu",
  39                                       "%",  "c%", "p%", "l%" };
  40
  41
  42 /*  The following static items form a simple scanner for
  43  *  length strings, used by isValid[Glue]Length.  See comments there.
  44  */
  45 double           number[4] = { 0, 0, 0, 0 };
  46 LyXLength::UNIT unit[4]   = { LyXLength::UNIT_NONE,
  47                               LyXLength::UNIT_NONE,
  48                               LyXLength::UNIT_NONE,
  49                               LyXLength::UNIT_NONE };
  50 int number_index;
  51 int unit_index;
  52
  53
  54 inline
  55 void lyx_advance(string & data, string::size_type n)
  56 {
  57         data.erase(0, n);
  58 }
  59
  60
  61 inline
  62 bool isEndOfData(string const & data)
  63 {
  64         return frontStrip(data).empty();
  65 }
  66
  67
  68 char nextToken(string & data)
  69 {
  70         data = frontStrip(data);
  71         if (data.empty())
  72                 return '\0';
  73         else if (data[0] == '+') {
  74                 lyx_advance(data, 1);
  75                 return '+';
  76         } else if (prefixIs(data, "plus")) {
  77                 lyx_advance(data, 4);
  78                 return '+';
  79         } else if (data[0] == '-') {
  80                 lyx_advance(data, 1);
  81                 return '-';
  82         } else if (prefixIs(data, "minus")) {
  83                 lyx_advance(data, 5);
  84                 return '-';
  85         } else {
  86                 string::size_type i = data.find_first_not_of("0123456789.");
  87
  88                 if (i != 0) {
  89                         if (number_index > 3) return 'E';
  90
  91                         string buffer;
  92
  93                         // we have found some number
  94                         if (i == string::npos) {
  95                                 buffer = data;
  96                                 i = data.size() + 1;
  97                         } else
  98                                 buffer = data.substr(0, i);
  99
 100                         lyx_advance(data, i);
 101
 102                         if (isStrDbl(buffer)) {
 103                                 number[number_index] = strToDbl(buffer);
 104                                 ++number_index;
 105                                 return 'n';
 106                         } else return 'E';
 107                 }
 108
 109                 i = data.find_first_not_of("abcdefghijklmnopqrstuvwxyz%");
 110                 if (i != 0) {
 111                         if (unit_index > 3) return 'E';
 112
 113                         string buffer;
 114
 115                         // we have found some alphabetical string
 116                         if (i == string::npos) {
 117                                 buffer = data;
 118                                 i = data.size() + 1;
 119                         } else
 120                                 buffer = data.substr(0, i);
 121
 122                         // possibly we have "mmplus" string or similar
 123                         if (buffer.size() > 5 && (buffer.substr(2,4) == string("plus") || buffer.substr(2,5) == string("minus"))) {
 124                                 lyx_advance(data, 2);
 125                                 unit[unit_index] = unitFromString(buffer.substr(0, 2));
 126                         } else {
 127                                 lyx_advance(data, i);
 128                                 unit[unit_index] = unitFromString(buffer);
 129                         }
 130
 131                         if (unit[unit_index] != LyXLength::UNIT_NONE) {
 132                                 ++unit_index;
 133                                 return 'u';
 134                         } else return 'E';  // Error
 135                 }
 136                 return 'E';  // Error
 137         }
 138 }
 139
 140
 141 struct LaTeXLength {
 142         char const * pattern;
 143         int  plus_val_index;
 144         int  minus_val_index;
 145         int  plus_uni_index;
 146         int  minus_uni_index;
 147 };
 148
 149
 150 LaTeXLength table[] = {
 151         { "nu",       0, 0, 0, 0 },
 152         { "nu+nu",    2, 0, 2, 0 },
 153         { "nu+nu-nu", 2, 3, 2, 3 },
 154         { "nu+-nu",   2, 2, 2, 2 },
 155         { "nu-nu",    0, 2, 0, 2 },
 156         { "nu-nu+nu", 3, 2, 3, 2 },
 157         { "nu-+nu",   2, 2, 2, 2 },
 158         { "n+nu",     2, 0, 1, 0 },
 159         { "n+n-nu",   2, 3, 1, 1 },
 160         { "n+-nu",    2, 2, 1, 1 },
 161         { "n-nu",     0, 2, 0, 1 },
 162         { "n-n+nu",   3, 2, 1, 1 },
 163         { "n-+nu",    2, 2, 1, 1 },
 164         { "",         0, 0, 0, 0 }   // sentinel, must be empty
 165 };
 166
 167 } // namespace anon
 168
 169 const char * stringFromUnit(int unit)
 170 {
 171         if (unit < 0 || unit >= num_units)
 172                 return 0;
 173         return unit_name[unit];
 174 }
 175
 176
 177 bool isValidGlueLength(string const & data, LyXGlueLength * result)
 178 {
 179         // This parser is table-driven.  First, it constructs a "pattern"
 180         // that describes the sequence of tokens in "data".  For example,
 181         // "n-nu" means: number, minus sign, number, unit.  As we go along,
 182         // numbers and units are stored into static arrays.  Then, "pattern"
 183         // is searched in the "table".  If it is found, the associated
 184         // table entries tell us which number and unit should go where
 185         // in the LyXLength structure.  Example: if "data" has the "pattern"
 186         // "nu+nu-nu", the associated table entries are "2, 3, 2, 3".
 187         // That means, "plus_val" is the second number that was seen
 188         // in the input, "minus_val" is the third number, and "plus_uni"
 189         // and "minus_uni" are the second and third units, respectively.
 190         // ("val" and "uni" are always the first items seen in "data".)
 191         // This is the most elegant solution I could find -- a straight-
 192         // forward approach leads to very long, tedious code that would be
 193         // much harder to understand and maintain. (AS)
 194
 195         if (data.empty())
 196                 return true;
 197         string buffer = frontStrip(data);
 198
 199         // To make isValidGlueLength recognize negative values as
 200         // the first number this little hack is needed:
 201         int val_sign = 1; // positive as default
 202         switch (buffer[0]) {
 203         case '-':
 204                 lyx_advance(buffer, 1);
 205                 val_sign = -1;
 206                 break;
 207         case '+':
 208                 lyx_advance(buffer, 1);
 209                 // fall through
 210         default:
 211                 // no action
 212                 break;
 213         }
 214         // end of hack
 215
 216         int  pattern_index = 0;
 217         int  table_index = 0;
 218         char pattern[20];
 219
 220         number_index = 1;
 221         unit_index = 1;  // entries at index 0 are sentinels
 222
 223         // construct "pattern" from "data"
 224         while (!isEndOfData (buffer)) {
 225                 if (pattern_index > 20) return false;
 226                 pattern[pattern_index] = nextToken (buffer);
 227                 if (pattern[pattern_index] == 'E') return false;
 228                 ++pattern_index;
 229         }
 230         pattern[pattern_index] = '\0';
 231
 232         // search "pattern" in "table"
 233         table_index = 0;
 234         while (compare(pattern, table[table_index].pattern)) {
 235                 ++table_index;
 236                 if (!*table[table_index].pattern)
 237                         return false;
 238         }
 239
 240         // Get the values from the appropriate places.  If an index
 241         // is zero, the corresponding array value is zero or UNIT_NONE,
 242         // so we needn't check this.
 243         if (result) {
 244                 result->val_        = number[1] * val_sign;
 245                 result->unit_       = unit[1];
 246                 result->plus_val_   = number[table[table_index].plus_val_index];
 247                 result->minus_val_  = number[table[table_index].minus_val_index];
 248                 result->plus_unit_  = unit  [table[table_index].plus_uni_index];
 249                 result->minus_unit_ = unit  [table[table_index].minus_uni_index];
 250         }
 251         return true;
 252 }
 253
 254
 255 bool isValidLength(string const & data, LyXLength * result)
 256 {
 257         /// This is a trimmed down version of isValidGlueLength.
 258         /// The parser may seem overkill for lengths without
 259         /// glue, but since we already have it, using it is
 260         /// easier than writing something from scratch.
 261         if (data.empty())
 262                 return true;
 263
 264         string   buffer = data;
 265         int      pattern_index = 0;
 266         char     pattern[3];
 267
 268         // To make isValidLength recognize negative values
 269         // this little hack is needed:
 270         int val_sign = 1; // positive as default
 271         switch (buffer[0]) {
 272         case '-':
 273                 lyx_advance(buffer, 1);
 274                 val_sign = -1;
 275                 break;
 276         case '+':
 277                 lyx_advance(buffer, 1);
 278                 // fall through
 279         default:
 280                 // no action
 281                 break;
 282         }
 283         // end of hack
 284
 285         number_index = unit_index = 1;  // entries at index 0 are sentinels
 286
 287         // construct "pattern" from "data"
 288         while (!isEndOfData (buffer)) {
 289                 if (pattern_index > 2)
 290                         return false;
 291                 pattern[pattern_index] = nextToken (buffer);
 292                 if (pattern[pattern_index] == 'E')
 293                         return false;
 294                 ++pattern_index;
 295         }
 296         pattern[pattern_index] = '\0';
 297
 298         // only the most basic pattern is accepted here
 299         if (compare(pattern, "nu") != 0) return false;
 300
 301         // It _was_ a correct length string.
 302         // Store away the values we found.
 303         if (result) {
 304                 result->val_  = number[1] * val_sign;
 305                 result->unit_ = unit[1];
 306         }
 307         return true;
 308 }
 309
 310
 311
 312
 313 //
 314 // LyXLength
 315 //
 316
 317 LyXLength::LyXLength()
 318         : val_(0), unit_(LyXLength::PT)
 319 {}
 320
 321
 322 LyXLength::LyXLength(double v, LyXLength::UNIT u)
 323         : val_(v), unit_(u)
 324 {}
 325
 326
 327 LyXLength::LyXLength(string const & data)
 328 {
 329         LyXLength tmp;
 330
 331         if (!isValidLength (data, &tmp))
 332                 return; // should raise an exception
 333
 334         val_  = tmp.val_;
 335         unit_ = tmp.unit_;
 336 }
 337
 338
 339 string const LyXLength::asString() const
 340 {
 341         ostringstream buffer;
 342         buffer << val_ << unit_name[unit_]; // setw?
 343         return buffer.str().c_str();
 344 }
 345
 346
 347 string const LyXLength::asLatexString() const
 348 {
 349         ostringstream buffer;
 350         switch(unit_) {
 351         case PW:
 352         case PE:
 353             buffer << abs(static_cast<int>(val_/100)) << "."
 354                                 << abs(static_cast<int>(val_)%100) << "\\columnwidth";
 355             break;
 356         case PP:
 357             buffer << abs(static_cast<int>(val_/100)) << "."
 358                                 << abs(static_cast<int>(val_)%100) << "\\pagewidth";
 359             break;
 360         case PL:
 361             buffer << abs(static_cast<int>(val_/100)) << "."
 362                                 << abs(static_cast<int>(val_)%100) << "\\linewidth";
 363             break;
 364         default:
 365             buffer << val_ << unit_name[unit_]; // setw?
 366             break;
 367         }
 368         return buffer.str().c_str();
 369 }
 370
 371
 372 double LyXLength::value() const
 373 {
 374         return val_;
 375 }
 376
 377
 378 LyXLength::UNIT LyXLength::unit() const
 379 {
 380         return unit_;
 381 }
 382
 383
 384 bool operator==(LyXLength const & l1, LyXLength const & l2)
 385 {
 386         return l1.value() == l2.value() && l1.unit() == l2.unit();
 387 }
 388
 389
 390 LyXLength::UNIT unitFromString (string const & data)
 391 {
 392         int i = 0;
 393         while (i < num_units && data != unit_name[i])
 394                 ++i;
 395         return static_cast<LyXLength::UNIT>(i);
 396 }
 397
 398
 399
 400 //
 401 // LyXGlueLength
 402 //
 403
 404
 405 LyXGlueLength::LyXGlueLength(
 406                         double v,  LyXLength::UNIT u,
 407                         double pv, LyXLength::UNIT pu,
 408                         double mv, LyXLength::UNIT mu)
 409         : LyXLength(v, u),
 410           plus_val_(pv),  minus_val_(mv),
 411           plus_unit_(pu), minus_unit_(mu)
 412 {}
 413
 414
 415 LyXGlueLength::LyXGlueLength(string const & data)
 416 {
 417         LyXGlueLength tmp(0.0, PT);
 418
 419         // we should really raise exception here
 420         if (!isValidGlueLength(data, &tmp))
 421                 ;
 422
 423         val_        = tmp.val_;
 424         unit_       = tmp.unit_;
 425         plus_val_   = tmp.plus_val_;
 426         plus_unit_  = tmp.plus_unit_;
 427         minus_val_  = tmp.minus_val_;
 428         minus_unit_ = tmp.minus_unit_;
 429 }
 430
 431
 432 string const LyXGlueLength::asString() const
 433 {
 434         ostringstream buffer;
 435
 436         if (plus_val_ != 0.0)
 437                 if (minus_val_ != 0.0)
 438                         if (unit_ == plus_unit_ && unit_ == minus_unit_)
 439                                 if (plus_val_ == minus_val_)
 440                                         buffer << val_ << "+-"
 441                                                << plus_val_ << unit_name[unit_];
 442                                 else
 443                                         buffer << val_
 444                                                << '+' << plus_val_
 445                                                << '-' << minus_val_
 446                                                << unit_name[unit_];
 447                         else
 448                                 if (plus_unit_ == minus_unit_
 449                                     && plus_val_ == minus_val_)
 450                                         buffer << val_ << unit_name[unit_]
 451                                                << "+-" << plus_val_
 452                                                << unit_name[plus_unit_];
 453
 454                                 else
 455                                         buffer << val_ << unit_name[unit_]
 456                                                << '+' << plus_val_
 457                                                << unit_name[plus_unit_]
 458                                                << '-' << minus_val_
 459                                                << unit_name[minus_unit_];
 460                 else
 461                         if (unit_ == plus_unit_)
 462                                 buffer << val_ << '+' << plus_val_
 463                                        << unit_name[unit_];
 464                         else
 465                                 buffer << val_ << unit_name[unit_]
 466                                        << '+' << plus_val_
 467                                        << unit_name[plus_unit_];
 468
 469         else
 470                 if (minus_val_ != 0.0)
 471                         if (unit_ == minus_unit_)
 472                                 buffer << val_ << '-' << minus_val_
 473                                        << unit_name[unit_];
 474
 475                         else
 476                                 buffer << val_ << unit_name[unit_]
 477                                        << '-' << minus_val_
 478                                        << unit_name[minus_unit_];
 479                 else
 480                         buffer << val_ << unit_name[unit_];
 481
 482         return buffer.str().c_str();
 483 }
 484
 485
 486 string const LyXGlueLength::asLatexString() const
 487 {
 488         ostringstream buffer;
 489
 490         if (plus_val_ != 0.0)
 491                 if (minus_val_ != 0.0)
 492                         buffer << val_ << unit_name[unit_]
 493                                << " plus "
 494                                << plus_val_ << unit_name[plus_unit_]
 495                                << " minus "
 496                                << minus_val_ << unit_name[minus_unit_];
 497                 else
 498                         buffer << val_ << unit_name[unit_]
 499                                << " plus "
 500                                << plus_val_ << unit_name[plus_unit_];
 501         else
 502                 if (minus_val_ != 0.0)
 503                         buffer << val_ << unit_name[unit_]
 504                                << " minus "
 505                                << minus_val_ << unit_name[minus_unit_];
 506                 else
 507                         buffer << val_ << unit_name[unit_];
 508
 509         return buffer.str().c_str();
 510 }
 511
 512
 513 double LyXGlueLength::plusValue() const
 514 {
 515         return plus_val_;
 516 }
 517
 518
 519 LyXLength::UNIT LyXGlueLength::plusUnit() const
 520 {
 521         return plus_unit_;
 522 }
 523
 524
 525 double LyXGlueLength::minusValue() const
 526 {
 527         return minus_val_;
 528 }
 529
 530
 531 LyXLength::UNIT LyXGlueLength::minusUnit() const
 532 {
 533         return minus_unit_;
 534 }
 535
 536
 537 bool operator==(LyXGlueLength const & l1, LyXGlueLength const & l2)
 538 {
 539         return l1.value() == l2.value()
 540                 && l1.unit() == l2.unit()
 541                 && l1.plusValue() == l2.plusValue()
 542                 && l1.plusUnit() == l2.plusUnit()
 543                 && l1.minusValue() == l2.minusValue()
 544                 && l1.minusUnit() == l2.minusUnit();
 545 }
 546
 547
 548
 549
 550 //
 551 //  VSpace class
 552 //
 553
 554 VSpace::VSpace()
 555         : kind_(NONE), len_(0.0, LyXLength::PT), keep_(false)
 556 {}
 557
 558
 559 VSpace::VSpace(vspace_kind k)
 560         : kind_(k), len_(0.0, LyXLength::PT), keep_(false)
 561 {}
 562
 563
 564 VSpace::VSpace(LyXGlueLength l)
 565         : kind_(LENGTH), len_(l), keep_(false)
 566 {}
 567
 568
 569 VSpace::VSpace(double v, LyXLength::UNIT u)
 570         : kind_(LENGTH), len_(v, u), keep_(false)
 571 {}
 572
 573
 574 VSpace::VSpace(string const & data)
 575         : kind_(NONE), len_(0.0, LyXLength::PT), keep_(false)
 576 {
 577         if (data.empty())
 578                 return;
 579         double value;
 580         string input  = strip(data);
 581
 582         string::size_type const length = input.length();
 583
 584         if (length > 1 && input[length-1] == '*') {
 585                 keep_ = true;
 586                 input.erase(length - 1);
 587         }
 588
 589         if      (prefixIs (input, "defskip"))    kind_ = DEFSKIP;
 590         else if (prefixIs (input, "smallskip"))  kind_ = SMALLSKIP;
 591         else if (prefixIs (input, "medskip"))    kind_ = MEDSKIP;
 592         else if (prefixIs (input, "bigskip"))    kind_ = BIGSKIP;
 593         else if (prefixIs (input, "vfill"))      kind_ = VFILL;
 594         else if (isValidGlueLength(input, &len_)) kind_ = LENGTH;
 595         else if (sscanf(input.c_str(), "%lf", &value) == 1) {
 596                 // This last one is for reading old .lyx files
 597                 // without units in added_space_top/bottom.
 598                 // Let unit default to centimeters here.
 599                 kind_ = LENGTH;
 600                 len_  = LyXGlueLength(value, LyXLength::CM);
 601         }
 602 }
 603
 604
 605 VSpace::vspace_kind VSpace::kind() const
 606 {
 607         return kind_;
 608 }
 609
 610
 611 LyXGlueLength VSpace::length() const
 612 {
 613         return len_;
 614 }
 615
 616
 617 bool VSpace::keep() const
 618 {
 619         return keep_;
 620 }
 621
 622
 623 void VSpace::setKeep(bool val)
 624 {
 625         keep_ = val;
 626 }
 627
 628
 629 bool VSpace::operator==(VSpace const & other) const
 630 {
 631         if (kind_ != other.kind_)
 632                 return false;
 633
 634         if (kind_ != LENGTH)
 635                 return this->keep_ == other.keep_;
 636
 637         if (len_ != other.len_)
 638                 return false;
 639
 640         return keep_ == other.keep_;
 641 }
 642
 643
 644 string const VSpace::asLyXCommand() const
 645 {
 646         string result;
 647         switch (kind_) {
 648         case NONE:      break;
 649         case DEFSKIP:   result = "defskip";      break;
 650         case SMALLSKIP: result = "smallskip";    break;
 651         case MEDSKIP:   result = "medskip";      break;
 652         case BIGSKIP:   result = "bigskip";      break;
 653         case VFILL:     result = "vfill";        break;
 654         case LENGTH:    result = len_.asString(); break;
 655         }
 656         if (keep_ && kind_ != NONE && kind_ != DEFSKIP)
 657                 result += '*';
 658         return result;
 659 }
 660
 661
 662 string const VSpace::asLatexCommand(BufferParams const & params) const
 663 {
 664         switch (kind_) {
 665         case NONE:      return string();
 666         case DEFSKIP:
 667                 return params.getDefSkip().asLatexCommand(params);
 668         case SMALLSKIP: return keep_ ? "\\vspace*{\\smallskipamount}"
 669                                 : "\\smallskip{}";
 670         case MEDSKIP:   return keep_ ? "\\vspace*{\\medskipamount}"
 671                                 : "\\medskip{}";
 672         case BIGSKIP:   return keep_ ? "\\vspace*{\\bigskipamount}"
 673                                 : "\\bigskip{}";
 674         case VFILL:     return keep_ ? "\\vspace*{\\fill}"
 675                                 : "\\vfill{}";
 676         case LENGTH:    return keep_ ? "\\vspace*{" + len_.asLatexString() + '}'
 677                                 : "\\vspace{" + len_.asLatexString() + '}';
 678         }
 679         return string();  // should never be reached
 680 }
 681
 682
 683 int VSpace::inPixels(BufferView * bv) const
 684 {
 685         // Height of a normal line in pixels (zoom factor considered)
 686         int height = bv->text->defaultHeight(); // [pixels]
 687         int skip  = 0;
 688         int width = bv->workWidth();
 689
 690         if (kind_ == DEFSKIP)
 691                 skip = bv->buffer()->params.getDefSkip().inPixels(bv);
 692
 693         return inPixels(height, skip, width);
 694 }
 695
 696
 697 int VSpace::inPixels(int default_height, int default_skip, int default_width)
 698         const
 699 {
 700         // Height of a normal line in pixels (zoom factor considered)
 701         int height = default_height; // [pixels]
 702
 703         // Zoom factor specified by user in percent
 704         double const zoom = lyxrc.zoom / 100.0; // [percent]
 705
 706         // DPI setting for monitor: pixels/inch
 707         double const dpi = lyxrc.dpi; // screen resolution [pixels/inch]
 708
 709         // We want the result in pixels
 710         double result;
 711         double value;
 712
 713         switch (kind_) {
 714         case NONE:
 715                 return 0;
 716
 717         case DEFSKIP:
 718                 return default_skip;
 719
 720                 // This is how the skips are normally defined by
 721                 // LateX.  But there should be some way to change
 722                 // this per document.
 723         case SMALLSKIP: return height / 4;
 724         case MEDSKIP:   return height / 2;
 725         case BIGSKIP:   return height;
 726         case VFILL:     return 3 * height;
 727                 // leave space for the vfill symbol
 728         case LENGTH:
 729                 // Pixel values are scaled so that the ratio
 730                 // between lengths and font sizes on the screen
 731                 // is the same as on paper.
 732
 733                 // we don't care about sign of value, we
 734                 // display negative space with text too
 735                 result = 0.0;
 736                 value  = len_.value();
 737                 int val_sign = value < 0.0 ? -1 : 1;
 738
 739                 switch (len_.unit()) {
 740                 case LyXLength::SP:
 741                         // Scaled point: sp = 1/65536 pt
 742                         result = zoom * dpi * value
 743                                 / (72.27 * 65536); // 4736286.7
 744                         break;
 745                 case LyXLength::PT:
 746                         // Point: 1 pt = 1/72.27 inch
 747                         result = zoom * dpi * value
 748                                 / 72.27; // 72.27
 749                         break;
 750                 case LyXLength::BP:
 751                         // Big point: 1 bp = 1/72 inch
 752                         result = zoom * dpi * value
 753                                 / 72; // 72
 754                         break;
 755                 case LyXLength::DD:
 756                         // Didot: 1157dd = 1238 pt?
 757                         result = zoom * dpi * value
 758                                 / (72.27 / (0.376 * 2.845)); // 67.559735
 759                         break;
 760                 case LyXLength::MM:
 761                         // Millimeter: 1 mm = 1/25.4 inch
 762                         result = zoom * dpi * value
 763                                 / 25.4; // 25.4
 764                         break;
 765                 case LyXLength::PC:
 766                         // Pica: 1 pc = 12 pt
 767                         result = zoom * dpi * value
 768                                 / (72.27 / 12); // 6.0225
 769                         break;
 770                 case LyXLength::CC:
 771                         // Cicero: 1 cc = 12 dd
 772                         result = zoom * dpi * value
 773                                 / (72.27 / (12 * 0.376 * 2.845)); // 5.6299779
 774                         break;
 775                 case LyXLength::CM:
 776                         // Centimeter: 1 cm = 1/2.54 inch
 777                         result = zoom * dpi * value
 778                                 / 2.54; // 2.54
 779                         break;
 780                 case LyXLength::IN:
 781                         // Inch
 782                         result = zoom * dpi * value;
 783                         break;
 784                 case LyXLength::EX:
 785                         // Ex: The height of an "x"
 786                         result = zoom * value * height / 2; // what to / width?
 787                         break;
 788                 case LyXLength::EM: // what to / width?
 789                         // Em: The width of an "m"
 790                         result = zoom * value * height / 2; // Why 2?
 791                         break;
 792                 case LyXLength::MU: // This is probably only allowed in
 793                         // math mode
 794                         result = zoom * value * height;
 795                         break;
 796                 case LyXLength::PW: // Always % of workarea
 797                 case LyXLength::PE:
 798                 case LyXLength::PP:
 799                 case LyXLength::PL:
 800                         result = value * default_width / 100;
 801                         break;
 802                 case LyXLength::UNIT_NONE:
 803                         result = 0;  // this cannot happen
 804                         break;
 805                 }
 806                 return static_cast<int>(result * val_sign + 0.5);
 807         }
 808         return 0; // never reached
 809 }