summaryrefslogtreecommitdiff
path: root/svx/source/dialog/framelink.cxx
blob: 2fe4d8187d9254390c90f1d66fea00905e2b46a9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
/*************************************************************************
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 * 
 * Copyright 2008 by Sun Microsystems, Inc.
 *
 * OpenOffice.org - a multi-platform office productivity suite
 *
 * $RCSfile: framelink.cxx,v $
 * $Revision: 1.10 $
 *
 * This file is part of OpenOffice.org.
 *
 * OpenOffice.org is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenOffice.org is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenOffice.org.  If not, see
 * <http://www.openoffice.org/license.html>
 * for a copy of the LGPLv3 License.
 *
 ************************************************************************/

// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_svx.hxx"
#include <svx/framelink.hxx>

#include <math.h>
#include <vcl/outdev.hxx>
#include <svx/borderline.hxx>

// ----------------------------------------------------------------------------

/** Define to select the drawing mode of thin dotted lines.

    0 = Draw lines using an own implementation (recommended). Draws always
        little dots in an appropriate distance.
    1 = Draw dotted lines using vcl/LineInfo. Results in dashed lines instead
        of dotted lines, which may look ugly for diagonal lines.
 */
#define SVX_FRAME_USE_LINEINFO 0

// ----------------------------------------------------------------------------

#if SVX_FRAME_USE_LINEINFO
#include <vcl/lineinfo.hxx>
#endif

namespace svx {
namespace frame {

// ============================================================================
// ============================================================================

namespace {

typedef std::vector< Point > PointVec;

// ----------------------------------------------------------------------------
// Link result structs for horizontal and vertical lines and borders.

/** Result struct used by the horizontal/vertical frame link functions.

    This struct is used to return coordinate offsets for one end of a single
    line in a frame border, i.e. the left end of the primary line of a
    horizontal frame border.

    1) Usage for horizontal lines

    If this struct is returned by the lclLinkHorFrameBorder() function, each
    member refers to the X coordinate of one edge of a single line end in a
    horizontal frame border. They specify an offset to modify this coordinate
    when the line is painted. The values in this struct may change a
    rectangular line shape into a line with slanted left or right border, which
    is used to connect the line with diagonal lines.

    Usage for a left line end:          Usage for a right line end:
                mnOffs1                         mnOffs1
                <------->                       <------->
                    +-------------------------------+
                    | the original horizontal line  |
                    +-------------------------------+
                <------->                       <------->
                mnOffs2                         mnOffs2

    2) Usage for vertical lines

    If this struct is returned by the lclLinkVerFrameBorder() function, each
    member refers to the Y coordinate of one edge of a single line end in a
    vertical frame border. They specify an offset to modify this coordinate
    when the line is painted. The values in this struct may change a
    rectangular line shape into a line with slanted top or bottom border, which
    is used to connect the line with diagonal lines.

    Usage for a top line end:       mnOffs1 ^               ^ mnOffs2
                                            |   +-------+   |
                                            v   |       |   v
                                                |       |
                                                |       |
                the original vertical line ---> |       |
                                                |       |
                                                |       |
                                            ^   |       |   ^
                                            |   +-------+   |
    Usage for a bottom line end:    mnOffs1 v               v mnOffs2
 */
struct LineEndResult
{
    long                mnOffs1;    /// Offset for top or left edge, dependent of context.
    long                mnOffs2;    /// Offset for bottom or right edge, dependent of context

    inline explicit     LineEndResult() : mnOffs1( 0 ), mnOffs2( 0 ) {}

    inline void         Swap() { std::swap( mnOffs1, mnOffs2 ); }
    inline void         Negate() { mnOffs1 = -mnOffs1; mnOffs2 = -mnOffs2; }
};

/** Result struct used by the horizontal/vertical frame link functions.

    This struct contains the linking results for one end of a frame border,
    including both the primary and secondary line ends.
 */
struct BorderEndResult
{
    LineEndResult       maPrim;     /// Result for primary line.
    LineEndResult       maSecn;     /// Result for secondary line.

    inline void         Negate() { maPrim.Negate(); maSecn.Negate(); }
};

/** Result struct used by the horizontal/vertical frame link functions.

    This struct contains the linking results for both frame border ends, and
    therefore for the complete frame border.
 */
struct BorderResult
{
    BorderEndResult     maBeg;      /// Result for begin of border line (left or top end).
    BorderEndResult     maEnd;      /// Result for end of border line (right or bottom end).
};

// ----------------------------------------------------------------------------
// Link result structs for diagonal lines and borders.

/** Result struct used by the diagonal frame link functions.

    This struct contains the linking results for one line of a diagonal frame
    border.
 */
struct DiagLineResult
{
    long                mnLClip;    /// Offset for left border of clipping rectangle.
    long                mnRClip;    /// Offset for right border of clipping rectangle.
    long                mnTClip;    /// Offset for top border of clipping rectangle.
    long                mnBClip;    /// Offset for bottom border of clipping rectangle.

    inline explicit     DiagLineResult() : mnLClip( 0 ), mnRClip( 0 ), mnTClip( 0 ), mnBClip( 0 ) {}
};

/** Result struct used by the diagonal frame link functions.

    This struct contains the linking results for one diagonal frame border.
 */
struct DiagBorderResult
{
    DiagLineResult      maPrim;     /// Result for primary line.
    DiagLineResult      maSecn;     /// Result for secondary line.
};

/** Result struct used by the diagonal frame link functions.

    This struct contains the linking results for both diagonal frame borders.
 */
struct DiagBordersResult
{
    DiagBorderResult    maTLBR;     /// Result for top-left to bottom-right frame border.
    DiagBorderResult    maBLTR;     /// Result for bottom-left to top-right frame border.
};

// ----------------------------------------------------------------------------

/** A helper struct containing two points of a line.
 */
struct LinePoints
{
    Point               maBeg;      /// Start position of the line.
    Point               maEnd;      /// End position of the line.

    explicit            LinePoints( const Point& rBeg, const Point& rEnd ) :
                            maBeg( rBeg ), maEnd( rEnd ) {}
    explicit            LinePoints( const Rectangle& rRect, bool bTLBR ) :
                            maBeg( bTLBR ? rRect.TopLeft() : rRect.TopRight() ),
                            maEnd( bTLBR ? rRect.BottomRight() : rRect.BottomLeft() ) {}
};

// ============================================================================

/** Rounds and casts a double value to a long value. */
inline long lclD2L( double fValue )
{
    return static_cast< long >( (fValue < 0.0) ? (fValue - 0.5) : (fValue + 0.5) );
}

/** Converts a width in twips to a width in another map unit (specified by fScale). */
sal_uInt16 lclScaleValue( long nValue, double fScale, sal_uInt16 nMaxWidth )
{
    // convert any width except 0 to at least 1 unit
    // #i61324# 1 twip must scale to 1/100mm
    return nValue ? static_cast< sal_uInt16 >( std::min< long >( std::max(
        static_cast< long >( nValue * fScale ), 1L ), nMaxWidth ) ) : 0;
}

// ----------------------------------------------------------------------------
// Line width offset calculation.

/** Returns the start offset of the single/primary line across the frame border.

    All following lclGet*Beg() and lclGet*End() functions return sub units to
    increase the computational accuracy, where 256 sub units are equal to
    1 map unit of the used OutputDevice.

    The following pictures show the upper end of a vertical frame border and
    illustrates the return values of all following lclGet*Beg() and lclGet*End()
    functions. The first picture shows a single frame border, the second picture
    shows a double frame border.

    The functions regard the reference point handling mode of the passed border
    style.
    REFMODE_CENTERED:
        All returned offsets are relative to the middle position of the frame
        border (offsets left of the middle are returned negative, offsets right
        of the middle are returned positive).
    REFMODE_BEGIN:
        All returned offsets are relative to the begin of the frame border
        (lclGetBeg() always returns 0).
    REFMODE_END:
        All returned offsets are relative to the end of the frame border
        (lclGetEnd() always returns 0).

                                                        |<- lclGetEnd()
                       |<- lclGetBeforeBeg()            |<- lclGetPrimEnd()
                       |                                |
                       ||<- lclGetBeg()                 ||<- lclGetBehindEnd()
                       ||                               ||
                       |#################################|
       direction of |   #################################
          the frame |   #################################
          border is |   #################################
           vertical |   #################################
                    v   #################################
                                        |
                                        |<- middle of the frame border


                                         lclGetDistEnd() ->||<- lclGetSecnBeg()
                                                           ||
          lclGetBeg() ->|   lclGetDistBeg() ->|            ||           |<- lclGetEnd()
                        |                     |            ||           |
    lclGetBeforeBeg()->||  lclGetPrimEnd() ->||            ||           ||<- lclGetBehindEnd()
                       ||                    ||            ||           ||
                       |######################|            |#############|
       direction of |   ######################              #############
          the frame |   ######################              #############
          border is |   ######################              #############
           vertical |   ######################  |           #############
                    v   ######################  |           #############
                        primary line            |           secondary line
                                                |
                                                |<- middle of the frame border

    @return
        The start offset of the single/primary line relative to the reference
        position of the frame border (sub units; 0 for invisible or one pixel
        wide single frame styles).
 */
long lclGetBeg( const Style& rBorder )
{
    long nPos = 0;
    switch( rBorder.GetRefMode() )
    {
        case REFMODE_CENTERED:  if( rBorder.Prim() ) nPos = -128 * (rBorder.GetWidth() - 1); break;
        case REFMODE_END:       if( rBorder.Prim() ) nPos = -256 * (rBorder.GetWidth() - 1); break;
        case REFMODE_BEGIN:     break;
    }
    return nPos;
}

/** Returns the end offset of the single/secondary line across the frame border.
    @descr  See description of lclGetBeg() for an illustration.
    @return  The end offset of the single/secondary line relative to the
    reference position of the frame border (sub units; 0 for invisible or one
    pixel wide single frame styles). */
long lclGetEnd( const Style& rBorder )
{
    long nPos = 0;
    switch( rBorder.GetRefMode() )
    {
        case REFMODE_CENTERED:  if( rBorder.Prim() ) nPos = 128 * (rBorder.GetWidth() - 1); break;
        case REFMODE_BEGIN:     if( rBorder.Prim() ) nPos = 256 * (rBorder.GetWidth() - 1); break;
        case REFMODE_END:     break;
    }
    return nPos;
}

/** Returns the end offset of the primary line across the frame border.
    @descr  See description of lclGetBeg() for an illustration.
    @return  The end offset of the primary line relative to the reference
    position of the frame border (sub units; the end of the primary line in a
    double frame style, otherwise the same as lclGetEnd()). */
inline long lclGetPrimEnd( const Style& rBorder )
{ return rBorder.Prim() ? (lclGetBeg( rBorder ) + 256 * (rBorder.Prim() - 1)) : 0; }

/** Returns the start offset of the secondary line across the frame border.
    @descr  See description of lclGetBeg() for an illustration.
    @return  The start offset of the secondary line relative to the reference
    position of the frame border (sub units; 0 for single/invisible border
    styles). */
inline long lclGetSecnBeg( const Style& rBorder )
{ return rBorder.Secn() ? (lclGetEnd( rBorder ) - 256 * (rBorder.Secn() - 1)) : 0; }

/** Returns the start offset of the distance space across the frame border.
    @descr  See description of lclGetBeg() for an illustration.
    @return  The start offset of the distance space relative to the reference
    position of the frame border (sub units; 0 for single/invisible border
    styles). */
inline long lclGetDistBeg( const Style& rBorder )
{ return rBorder.Secn() ? (lclGetBeg( rBorder ) + 256 * rBorder.Prim()) : 0; }

/** Returns the end offset of the distance space across the frame border.
    @descr  See description of lclGetBeg() for an illustration.
    @return  The end offset of the distance space relative to the reference
    position of the frame border (sub units; 0 for single/invisible border
    styles). */
inline long lclGetDistEnd( const Style& rBorder )
{ return rBorder.Secn() ? (lclGetEnd( rBorder ) - 256 * rBorder.Secn()) : 0; }

/** Returns the offset before start of single/primary line across the frame border.
    @descr  See description of lclGetBeg() for an illustration.
    @return  The offset directly before start of single/primary line relative
    to the reference position of the frame border (sub units; a value one less
    than lclGetBeg() for visible frame styles, or 0 for invisible frame style). */
inline long lclGetBeforeBeg( const Style& rBorder )
{ return rBorder.Prim() ? (lclGetBeg( rBorder ) - 256) : 0; }

/** Returns the offset behind end of single/secondary line across the frame border.
    @descr  See description of lclGetBeg() for an illustration.
    @return  The offset directly behind end of single/secondary line relative
    to the reference position of the frame border (sub units; a value one
    greater than lclGetEnd() for visible frame styles, or 0 for invisible frame
    style). */
inline long lclGetBehindEnd( const Style& rBorder )
{ return rBorder.Prim() ? (lclGetEnd( rBorder ) + 256) : 0; }

// ============================================================================
// Linking functions
// ============================================================================

// ----------------------------------------------------------------------------
// Linking of single horizontal line ends.

/** Calculates X offsets for the left end of a single horizontal frame border.

    See DrawHorFrameBorder() function for a description of all parameters.

    @param rResult
        (out-param) The contained values (sub units) specify offsets for the
        X coordinates of the left line end.
 */
void lclLinkLeftEnd_Single(
        LineEndResult& rResult, const Style& rBorder,
        const DiagStyle& rLFromTR, const Style& rLFromT, const Style& rLFromL, const Style& rLFromB, const DiagStyle& rLFromBR )
{
    // both vertical and diagonal frame borders are double
    if( rLFromT.Secn() && rLFromB.Secn() && rLFromTR.Secn() && rLFromBR.Secn() )
    {
        // take left position of upper and lower secondary start
        rResult.mnOffs1 = GetBLDiagOffset( lclGetBeg( rBorder ), lclGetSecnBeg( rLFromTR ), rLFromTR.GetAngle() );
        rResult.mnOffs2 = GetTLDiagOffset( lclGetEnd( rBorder ), lclGetSecnBeg( rLFromBR ), rLFromBR.GetAngle() );
    }
    else
    {
        // both vertical frame borders are double
        if( rLFromT.Secn() && rLFromB.Secn() )
            rResult.mnOffs1 = (!rLFromTR.Secn() && !rLFromBR.Secn() && (rLFromT.GetWidth() == rLFromB.GetWidth())) ?
                // don't overdraw vertical borders with equal width
                lclGetBehindEnd( rLFromT ) :
                // take leftmost start of both secondary lines (#46488#)
                rResult.mnOffs1 = std::min( lclGetSecnBeg( rLFromT ), lclGetSecnBeg( rLFromB ) );

        // single border with equal width coming from left
        else if( !rLFromL.Secn() && (rLFromL.Prim() == rBorder.Prim()) )
            // draw to connection point
            rResult.mnOffs1 = 0;

        // single border coming from left
        else if( !rLFromL.Secn() && rLFromL.Prim() )
        {
            if( rLFromL.Prim() == rBorder.Prim() )
                // draw to reference position, if from left has equal width
                rResult.mnOffs1 = 0;
            else
                rResult.mnOffs1 = (rLFromL < rBorder) ?
                    // take leftmost start of both frame borders, if from left is thinner
                    std::min( lclGetBeg( rLFromT ), lclGetBeg( rLFromB ) ) :
                    // do not overdraw vertical, if from left is thicker
                    std::max( lclGetBehindEnd( rLFromT ), lclGetBehindEnd( rLFromB ) );
        }

        // no border coming from left
        else if( !rLFromL.Prim() )
            // don't overdraw vertical borders with equal width
            rResult.mnOffs1 = (rLFromT.GetWidth() == rLFromB.GetWidth()) ?
                lclGetBehindEnd( rLFromT ) :
                std::min( lclGetBeg( rLFromT ), lclGetBeg( rLFromB ) );

        // double frame border coming from left and from top
        else if( rLFromT.Secn() )
            // do not overdraw the vertical double frame border
            rResult.mnOffs1 = lclGetBehindEnd( rLFromT );

        // double frame border coming from left and from bottom
        else if( rLFromB.Secn() )
            // do not overdraw the vertical double frame border
            rResult.mnOffs1 = lclGetBehindEnd( rLFromB );

        // double frame border coming from left, both vertical frame borders are single or off
        else
            // draw from leftmost start of both frame borders, if from left is not thicker
            rResult.mnOffs1 = (rLFromL <= rBorder) ?
                std::min( lclGetBeg( rLFromT ), lclGetBeg( rLFromB ) ) :
                std::max( lclGetBehindEnd( rLFromT ), lclGetBehindEnd( rLFromB ) );

        // bottom-left point is equal to top-left point (results in rectangle)
        rResult.mnOffs2 = rResult.mnOffs1;
    }
}

/** Calculates X offsets for the left end of a primary horizontal line.

    See DrawHorFrameBorder() function for a description of all parameters.

    @param rResult
        (out-param) The contained values (sub units) specify offsets for the
        X coordinates of the left end of the primary line.
 */
void lclLinkLeftEnd_Prim(
        LineEndResult& rResult, const Style& rBorder,
        const DiagStyle& rLFromTR, const Style& rLFromT, const Style& rLFromL, const Style& rLFromB, const DiagStyle& /*rLFromBR*/ )
{
    // double diagonal frame border coming from top right
    if( rLFromTR.Secn() )
    {
        // draw from where secondary diagonal line meets the own primary
        rResult.mnOffs1 = GetBLDiagOffset( lclGetBeg( rBorder ), lclGetSecnBeg( rLFromTR ), rLFromTR.GetAngle() );
        rResult.mnOffs2 = GetBLDiagOffset( lclGetPrimEnd( rBorder ), lclGetSecnBeg( rLFromTR ), rLFromTR.GetAngle() );
    }

    // no or single diagonal frame border - ignore it
    else
    {
        // double frame border coming from top
        if( rLFromT.Secn() )
            // draw from left edge of secondary vertical
            rResult.mnOffs1 = lclGetSecnBeg( rLFromT );

        // double frame border coming from left (from top is not double)
        else if( rLFromL.Secn() )
            // do not overdraw single frame border coming from top
            rResult.mnOffs1 = (rLFromL.GetWidth() == rBorder.GetWidth()) ?
                0 : lclGetBehindEnd( rLFromT );

        // double frame border coming from bottom (from top and from left are not double)
        else if( rLFromB.Secn() )
            // draw from left edge of primary vertical from bottom
            rResult.mnOffs1 = lclGetBeg( rLFromB );

        // no other frame border is double
        else
            // do not overdraw vertical frame borders
            rResult.mnOffs1 = std::max( lclGetBehindEnd( rLFromT ), lclGetBehindEnd( rLFromB ) );

        // bottom-left point is equal to top-left point (results in rectangle)
        rResult.mnOffs2 = rResult.mnOffs1;
    }
}

/** Calculates X offsets for the left end of a secondary horizontal line.

    See DrawHorFrameBorder() function for a description of all parameters.

    @param rResult
        (out-param) The contained values (sub units) specify offsets for the
        X coordinates of the left end of the secondary line.
 */
void lclLinkLeftEnd_Secn(
        LineEndResult& rResult, const Style& rBorder,
        const DiagStyle& rLFromTR, const Style& rLFromT, const Style& rLFromL, const Style& rLFromB, const DiagStyle& rLFromBR )
{
    /*  Recycle lclLinkLeftEnd_Prim() function with mirrored horizontal borders. */
    lclLinkLeftEnd_Prim( rResult, rBorder.Mirror(), rLFromBR, rLFromB, rLFromL.Mirror(), rLFromT, rLFromTR );
    rResult.Swap();
}

// ----------------------------------------------------------------------------
// Linking of horizontal frame border ends.

/** Calculates X offsets for the left end of a horizontal frame border.

    This function can be used for single and double frame borders.
    See DrawHorFrameBorder() function for a description of all parameters.

    @param rResult
        (out-param) The contained values (sub units) specify offsets for the
        X coordinates of the left end of the line(s) in the frame border.
 */
void lclLinkLeftEnd(
        BorderEndResult& rResult, const Style& rBorder,
        const DiagStyle& rLFromTR, const Style& rLFromT, const Style& rLFromL, const Style& rLFromB, const DiagStyle& rLFromBR )
{
    if( rBorder.Secn() )
    {
        // current frame border is double
        lclLinkLeftEnd_Prim( rResult.maPrim, rBorder, rLFromTR, rLFromT, rLFromL, rLFromB, rLFromBR );
        lclLinkLeftEnd_Secn( rResult.maSecn, rBorder, rLFromTR, rLFromT, rLFromL, rLFromB, rLFromBR );
    }
    else if( rBorder.Prim() )
    {
        // current frame border is single
        lclLinkLeftEnd_Single( rResult.maPrim, rBorder, rLFromTR, rLFromT, rLFromL, rLFromB, rLFromBR );
    }
    else
    {
        DBG_ERRORFILE( "lclLinkLeftEnd - called for invisible frame style" );
    }
}

/** Calculates X offsets for the right end of a horizontal frame border.

    This function can be used for single and double frame borders.
    See DrawHorFrameBorder() function for a description of all parameters.

    @param rResult
        (out-param) The contained values (sub units) specify offsets for the
        X coordinates of the right end of the line(s) in the frame border.
 */
void lclLinkRightEnd(
        BorderEndResult& rResult, const Style& rBorder,
        const DiagStyle& rRFromTL, const Style& rRFromT, const Style& rRFromR, const Style& rRFromB, const DiagStyle& rRFromBL )
{
    /*  Recycle lclLinkLeftEnd() function with mirrored vertical borders. */
    lclLinkLeftEnd( rResult, rBorder, rRFromTL.Mirror(), rRFromT.Mirror(), rRFromR, rRFromB.Mirror(), rRFromBL.Mirror() );
    rResult.Negate();
}

// ----------------------------------------------------------------------------
// Linking of horizontal and vertical frame borders.

/** Calculates X offsets for all line ends of a horizontal frame border.

    This function can be used for single and double frame borders.
    See DrawHorFrameBorder() function for a description of all parameters.

    @param rResult
        (out-param) The contained values (sub units) specify offsets for the
        X coordinates of both ends of the line(s) in the frame border. To get
        the actual X coordinates to draw the lines, these offsets have to be
        added to the X coordinates of the reference points of the frame border
        (the offsets may be negative).
 */
void lclLinkHorFrameBorder(
        BorderResult& rResult, const Style& rBorder,
        const DiagStyle& rLFromTR, const Style& rLFromT, const Style& rLFromL, const Style& rLFromB, const DiagStyle& rLFromBR,
        const DiagStyle& rRFromTL, const Style& rRFromT, const Style& rRFromR, const Style& rRFromB, const DiagStyle& rRFromBL )
{
    lclLinkLeftEnd( rResult.maBeg, rBorder, rLFromTR, rLFromT, rLFromL, rLFromB, rLFromBR );
    lclLinkRightEnd( rResult.maEnd, rBorder, rRFromTL, rRFromT, rRFromR, rRFromB, rRFromBL );
}

/** Calculates Y offsets for all line ends of a vertical frame border.

    This function can be used for single and double frame borders.
    See DrawVerFrameBorder() function for a description of all parameters.

    @param rResult
        (out-param) The contained values (sub units) specify offsets for the
        Y coordinates of both ends of the line(s) in the frame border. To get
        the actual Y coordinates to draw the lines, these offsets have to be
        added to the Y coordinates of the reference points of the frame border
        (the offsets may be negative).
 */
void lclLinkVerFrameBorder(
        BorderResult& rResult, const Style& rBorder,
        const DiagStyle& rTFromBL, const Style& rTFromL, const Style& rTFromT, const Style& rTFromR, const DiagStyle& rTFromBR,
        const DiagStyle& rBFromTL, const Style& rBFromL, const Style& rBFromB, const Style& rBFromR, const DiagStyle& rBFromTR )
{
    /*  Recycle lclLinkHorFrameBorder() function with correct parameters. The
        frame border is virtually mirrored at the top-left to bottom-right
        diagonal. rTFromBR and rBFromTL are mirrored to process their primary
        and secondary lines correctly. */
    lclLinkHorFrameBorder( rResult, rBorder,
        rTFromBL, rTFromL, rTFromT, rTFromR, rTFromBR.Mirror(),
        rBFromTL.Mirror(), rBFromL, rBFromB, rBFromR, rBFromTR );
}

// ============================================================================

#if 0
//  Not used anymore, but not deleted for possible future usage.

/** Returns the relative Y offset of the intercept point of 2 diagonal borders.

    @param nTLBROffs
        Width offset (sub units) across the top-left to bottom-right frame border.
    @param fTLBRAngle
        Inner angle between horizontal and top-left to bottom-right frame border.
    @param nBLTROffs
        Width offset (sub units) across the bottom-left to top-right frame border.
    @param fBLTRAngle
        Inner angle between horizontal and bottom-left to top-right frame border.
    @return
        Offset (sub units) relative to the Y position of the centered intercept
        point of both diagonal frame borders.
 */
long lclGetDiagDiagOffset( long nTLBROffs, double fTLBRAngle, long nBLTROffs, double fBLTRAngle )
{
    double fASin = sin( fTLBRAngle );
    double fACos = cos( fTLBRAngle );
    double fAX = -nTLBROffs * fASin;
    double fAY = nTLBROffs * fACos;
    double fRAX = fACos;
    double fRAY = fASin;

    double fBSin = sin( fBLTRAngle );
    double fBCos = cos( fBLTRAngle );
    double fBX = nBLTROffs * fBSin;
    double fBY = nBLTROffs * fBCos;
    double fRBX = fBCos;
    double fRBY = -fBSin;

    double fKA = (fRBX * (fBY - fAY) - fRBY * (fBX - fAX)) / (fRBX * fRAY - fRAX * fRBY);
    return lclD2L( fAY + fKA * fRAY );
}
#endif

// ----------------------------------------------------------------------------
// Linking of diagonal frame borders.

/** Calculates clipping offsets for a top-left to bottom-right frame border.

    This function can be used for single and double frame borders.
    See DrawDiagFrameBorders() function for a description of all parameters.

    @param rResult
        (out-param) The contained values (sub units) specify offsets for all
        borders of the reference rectangle containing the diagonal frame border.
 */
void lclLinkTLBRFrameBorder(
        DiagBorderResult& rResult, const Style& rBorder,
        const Style& rTLFromB, const Style& rTLFromR, const Style& rBRFromT, const Style& rBRFromL )
{
    bool bIsDbl = rBorder.Secn() != 0;

    rResult.maPrim.mnLClip = lclGetBehindEnd( rTLFromB );
    rResult.maPrim.mnRClip = (bIsDbl && rBRFromT.Secn()) ? lclGetEnd( rBRFromT ) : lclGetBeforeBeg( rBRFromT );
    rResult.maPrim.mnTClip = (bIsDbl && rTLFromR.Secn()) ? lclGetBeg( rTLFromR ) : lclGetBehindEnd( rTLFromR );
    rResult.maPrim.mnBClip = lclGetBeforeBeg( rBRFromL );

    if( bIsDbl )
    {
        rResult.maSecn.mnLClip = rTLFromB.Secn() ? lclGetBeg( rTLFromB ) : lclGetBehindEnd( rTLFromB );
        rResult.maSecn.mnRClip = lclGetBeforeBeg( rBRFromT );
        rResult.maSecn.mnTClip = lclGetBehindEnd( rTLFromR );
        rResult.maSecn.mnBClip = rBRFromL.Secn() ? lclGetEnd( rBRFromL ) : lclGetBeforeBeg( rBRFromL );
    }
}

/** Calculates clipping offsets for a bottom-left to top-right frame border.

    This function can be used for single and double frame borders.
    See DrawDiagFrameBorders() function for a description of all parameters.

    @param rResult
        (out-param) The contained values (sub units) specify offsets for all
        borders of the reference rectangle containing the diagonal frame border.
 */
void lclLinkBLTRFrameBorder(
        DiagBorderResult& rResult, const Style& rBorder,
        const Style& rBLFromT, const Style& rBLFromR, const Style& rTRFromB, const Style& rTRFromL )
{
    bool bIsDbl = rBorder.Secn() != 0;

    rResult.maPrim.mnLClip = lclGetBehindEnd( rBLFromT );
    rResult.maPrim.mnRClip = (bIsDbl && rTRFromB.Secn()) ? lclGetEnd( rTRFromB ) : lclGetBeforeBeg( rTRFromB );
    rResult.maPrim.mnTClip = lclGetBehindEnd( rTRFromL );
    rResult.maPrim.mnBClip = (bIsDbl && rBLFromR.Secn()) ? lclGetEnd( rBLFromR ) : lclGetBeforeBeg( rBLFromR );

    if( bIsDbl )
    {
        rResult.maSecn.mnLClip = rBLFromT.Secn() ? lclGetBeg( rBLFromT ) : lclGetBehindEnd( rBLFromT );
        rResult.maSecn.mnRClip = lclGetBeforeBeg( rTRFromB );
        rResult.maSecn.mnTClip = rTRFromL.Secn() ? lclGetBeg( rTRFromL ) : lclGetBehindEnd( rTRFromL );
        rResult.maSecn.mnBClip = lclGetBeforeBeg( rBLFromR );
    }
}

/** Calculates clipping offsets for both diagonal frame borders.

    This function can be used for single and double frame borders.
    See DrawDiagFrameBorders() function for a description of all parameters.

    @param rResult
        (out-param) The contained values (sub units) specify offsets for all
        borders of the reference rectangle containing the diagonal frame
        borders.
 */
void lclLinkDiagFrameBorders(
        DiagBordersResult& rResult, const Style& rTLBR, const Style& rBLTR,
        const Style& rTLFromB, const Style& rTLFromR, const Style& rBRFromT, const Style& rBRFromL,
        const Style& rBLFromT, const Style& rBLFromR, const Style& rTRFromB, const Style& rTRFromL )
{
    lclLinkTLBRFrameBorder( rResult.maTLBR, rTLBR, rTLFromB, rTLFromR, rBRFromT, rBRFromL );
    lclLinkBLTRFrameBorder( rResult.maBLTR, rBLTR, rBLFromT, rBLFromR, rTRFromB, rTRFromL );
}

// ============================================================================
// Drawing functions
// ============================================================================

// ----------------------------------------------------------------------------
// Simple helper functions

/** Converts sub units to OutputDevice map units. */
inline long lclToMapUnit( long nSubUnits )
{
    return ((nSubUnits < 0) ? (nSubUnits - 127) : (nSubUnits + 128)) / 256;
}

/** Converts a point in sub units to an OutputDevice point. */
inline Point lclToMapUnit( long nSubXPos, long nSubYPos )
{
    return Point( lclToMapUnit( nSubXPos ), lclToMapUnit( nSubYPos ) );
}

/** Returns a polygon constructed from a vector of points. */
inline Polygon lclCreatePolygon( const PointVec& rPoints )
{
    return Polygon( static_cast< USHORT >( rPoints.size() ), &rPoints[ 0 ] );
}

/** Returns a polygon constructed from the four passed points. */
Polygon lclCreatePolygon( const Point& rP1, const Point& rP2, const Point& rP3, const Point& rP4 )
{
    PointVec aPoints;
    aPoints.reserve( 4 );
    aPoints.push_back( rP1 );
    aPoints.push_back( rP2 );
    aPoints.push_back( rP3 );
    aPoints.push_back( rP4 );
    return lclCreatePolygon( aPoints );
}

/** Returns a polygon constructed from the five passed points. */
Polygon lclCreatePolygon( const Point& rP1, const Point& rP2, const Point& rP3, const Point& rP4, const Point& rP5 )
{
    PointVec aPoints;
    aPoints.reserve( 5 );
    aPoints.push_back( rP1 );
    aPoints.push_back( rP2 );
    aPoints.push_back( rP3 );
    aPoints.push_back( rP4 );
    aPoints.push_back( rP5 );
    return lclCreatePolygon( aPoints );
}

/** Returns a polygon constructed from the two passed line positions. */
inline Polygon lclCreatePolygon( const LinePoints& rPoints1, const LinePoints& rPoints2 )
{
    return lclCreatePolygon( rPoints1.maBeg, rPoints1.maEnd, rPoints2.maEnd, rPoints2.maBeg );
}

/** Sets the color of the passed frame style to the output device.

    Sets the line color and fill color in the output device.

    @param rDev
        The output device the color has to be set to. The old colors are pushed
        onto the device's stack and can be restored with a call to
        OutputDevice::Pop(). Please take care about the correct calling order
        of Pop() if this function is used with other functions pushing
        something onto the stack.
    @param rStyle
        The border style that contains the line color to be set to the device.
 */
void lclSetColorToOutDev( OutputDevice& rDev, const Style& rStyle, const Color* pForceColor )
{
    rDev.Push( PUSH_LINECOLOR | PUSH_FILLCOLOR );
    rDev.SetLineColor( pForceColor ? *pForceColor : rStyle.GetColor() );
    rDev.SetFillColor( pForceColor ? *pForceColor : rStyle.GetColor() );
}

// ----------------------------------------------------------------------------
// Generic drawing functions.

/** Draws a thin (1 pixel wide) line, optionally dotted, into the passed output device. */
void lclDrawThinLine( OutputDevice& rDev, const Point& rBeg, const Point& rEnd, bool bDotted )
{
#if SVX_FRAME_USE_LINEINFO
    if( bDotted && (rBeg != rEnd) )
    {
// using LineInfo for dotted lines looks ugly and does not work well for diagonal lines
        LineInfo aLineInfo( LINE_DASH, 1 );
        aLineInfo.SetDotCount( 1 );
        aLineInfo.SetDotLen( 1 );
        aLineInfo.SetDistance( 3 );
        rDev.DrawLine( rBeg, rEnd, aLineInfo );
    }
#else
    Point aBeg( rDev.LogicToPixel( rBeg ) );
    Point aEnd( rDev.LogicToPixel( rEnd ) );
    if( bDotted && (aBeg != aEnd) )
    {
        bool bHor = Abs( aEnd.X() - aBeg.X() ) > Abs( aEnd.Y() - aBeg.Y() );
        const Point& rBegPos( bHor ? ((aBeg.X() < aEnd.X()) ? aBeg : aEnd) : ((aBeg.Y() < aEnd.Y()) ? aBeg : aEnd ) );
        const Point& rEndPos( (rBegPos == aBeg) ? aEnd : aBeg );

        long nAlongBeg = bHor ? rBegPos.X() : rBegPos.Y();
        long nAcrssBeg = bHor ? rBegPos.Y() : rBegPos.X();
        long nAlongSize = (bHor ? rEndPos.X() : rEndPos.Y()) - nAlongBeg;
        long nAcrssSize = (bHor ? rEndPos.Y() : rEndPos.X()) - nAcrssBeg;
        double fGradient = static_cast< double >( nAcrssSize ) / nAlongSize;

        PointVec aPoints;
        aPoints.reserve( (nAlongSize + 1) / 2 );
        for( long nAlongIdx = 0; nAlongIdx <= nAlongSize; nAlongIdx += 2 )
        {
            long nAl = nAlongBeg + nAlongIdx;
            long nAc = nAcrssBeg + lclD2L( fGradient * nAlongIdx );
            aPoints.push_back( Point( bHor ? nAl : nAc, bHor ? nAc : nAl ) );
        }

        rDev.Push( PUSH_MAPMODE );
        rDev.SetMapMode( MAP_PIXEL );
        rDev.DrawPixel( lclCreatePolygon( aPoints ) );
        rDev.Pop(); // map mode
    }
#endif
    else
        rDev.DrawLine( rBeg, rEnd );
}

/** Draws a thin (1 pixel wide) line, optionally dotted, into the passed output device. */
inline void lclDrawThinLine( OutputDevice& rDev, const LinePoints& rPoints, bool bDotted )
{
    lclDrawThinLine( rDev, rPoints.maBeg, rPoints.maEnd, bDotted );
}

/** Draws a polygon with four points into the passed output device. */
inline void lclDrawPolygon( OutputDevice& rDev, const Point& rP1, const Point& rP2, const Point& rP3, const Point& rP4 )
{
    rDev.DrawPolygon( lclCreatePolygon( rP1, rP2, rP3, rP4 ) );
}

/** Draws a polygon specified by two borders into the passed output device. */
inline void lclDrawPolygon( OutputDevice& rDev, const LinePoints& rPoints1, const LinePoints& rPoints2 )
{
    rDev.DrawPolygon( lclCreatePolygon( rPoints1, rPoints2 ) );
}

// ============================================================================
// Drawing of horizontal frame borders.

/** Draws a horizontal thin or thick line into the passed output device.

    The X coordinates of the edges of the line are adjusted according to the
    passed LineEndResult structs. A one pixel wide line can be drawn dotted.
 */
void lclDrawHorLine(
        OutputDevice& rDev,
        const Point& rLPos, const LineEndResult& rLRes,
        const Point& rRPos, const LineEndResult& rRRes,
        long nTOffs, long nBOffs, bool bDotted )
{
    LinePoints aTPoints( rLPos + lclToMapUnit( rLRes.mnOffs1, nTOffs ), rRPos + lclToMapUnit( rRRes.mnOffs1, nTOffs ) );
    if( nTOffs == nBOffs )
        lclDrawThinLine( rDev, aTPoints, bDotted );
    else
    {
        LinePoints aBPoints( rLPos + lclToMapUnit( rLRes.mnOffs2, nBOffs ), rRPos + lclToMapUnit( rRRes.mnOffs2, nBOffs ) );
        lclDrawPolygon( rDev, aTPoints, aBPoints );
    }
}

/** Draws a horizontal frame border into the passed output device.

    @param rLPos
        The top-left or bottom-left reference point of the diagonal frame border.
    @param rRPos
        The top-right or bottom-right reference point of the diagonal frame border.
    @param rBorder
        The frame style used to draw the border.
    @param rResult
        The X coordinates of the edges of all lines of the frame border are
        adjusted according to the offsets contained here.
 */
void lclDrawHorFrameBorder(
        OutputDevice& rDev, const Point& rLPos, const Point& rRPos,
        const Style& rBorder, const BorderResult& rResult, const Color* pForceColor )
{
    DBG_ASSERT( rBorder.Prim(), "svx::frame::lclDrawHorFrameBorder - line not visible" );
    DBG_ASSERT( rLPos.X() <= rRPos.X(), "svx::frame::lclDrawHorFrameBorder - wrong order of line ends" );
    DBG_ASSERT( rLPos.Y() == rRPos.Y(), "svx::frame::lclDrawHorFrameBorder - line not horizontal" );
    if( rLPos.X() <= rRPos.X() )
    {
        lclSetColorToOutDev( rDev, rBorder, pForceColor );
        lclDrawHorLine( rDev, rLPos, rResult.maBeg.maPrim, rRPos, rResult.maEnd.maPrim,
            lclGetBeg( rBorder ), lclGetPrimEnd( rBorder ), rBorder.Dotted() );
        if( rBorder.Secn() )
            lclDrawHorLine( rDev, rLPos, rResult.maBeg.maSecn, rRPos, rResult.maEnd.maSecn,
                lclGetSecnBeg( rBorder ), lclGetEnd( rBorder ), rBorder.Dotted() );
        rDev.Pop(); // colors
    }
}

// ----------------------------------------------------------------------------
// Drawing of vertical frame borders.

/** Draws a vertical thin or thick line into the passed output device.

    The Y coordinates of the edges of the line are adjusted according to the
    passed LineEndResult structs. A one pixel wide line can be drawn dotted.
 */
void lclDrawVerLine(
        OutputDevice& rDev,
        const Point& rTPos, const LineEndResult& rTRes,
        const Point& rBPos, const LineEndResult& rBRes,
        long nLOffs, long nROffs, bool bDotted )
{
    LinePoints aLPoints( rTPos + lclToMapUnit( nLOffs, rTRes.mnOffs1 ), rBPos + lclToMapUnit( nLOffs, rBRes.mnOffs1 ) );
    if( nLOffs == nROffs )
        lclDrawThinLine( rDev, aLPoints, bDotted );
    else
    {
        LinePoints aRPoints( rTPos + lclToMapUnit( nROffs, rTRes.mnOffs2 ), rBPos + lclToMapUnit( nROffs, rBRes.mnOffs2 ) );
        lclDrawPolygon( rDev, aLPoints, aRPoints );
    }
}

/** Draws a vertical frame border into the passed output device.

    @param rTPos
        The top-left or top-right reference point of the diagonal frame border.
    @param rBPos
        The bottom-left or bottom-right reference point of the diagonal frame border.
    @param rBorder
        The frame style used to draw the border.
    @param rResult
        The Y coordinates of the edges of all lines of the frame border are
        adjusted according to the offsets contained here.
 */
void lclDrawVerFrameBorder(
        OutputDevice& rDev, const Point& rTPos, const Point& rBPos,
        const Style& rBorder, const BorderResult& rResult, const Color* pForceColor )
{
    DBG_ASSERT( rBorder.Prim(), "svx::frame::lclDrawVerFrameBorder - line not visible" );
    DBG_ASSERT( rTPos.Y() <= rBPos.Y(), "svx::frame::lclDrawVerFrameBorder - wrong order of line ends" );
    DBG_ASSERT( rTPos.X() == rBPos.X(), "svx::frame::lclDrawVerFrameBorder - line not vertical" );
    if( rTPos.Y() <= rBPos.Y() )
    {
        lclSetColorToOutDev( rDev, rBorder, pForceColor );
        lclDrawVerLine( rDev, rTPos, rResult.maBeg.maPrim, rBPos, rResult.maEnd.maPrim,
            lclGetBeg( rBorder ), lclGetPrimEnd( rBorder ), rBorder.Dotted() );
        if( rBorder.Secn() )
            lclDrawVerLine( rDev, rTPos, rResult.maBeg.maSecn, rBPos, rResult.maEnd.maSecn,
                lclGetSecnBeg( rBorder ), lclGetEnd( rBorder ), rBorder.Dotted() );
        rDev.Pop(); // colors
    }
}

// ============================================================================
// Drawing of diagonal frame borders, incudes clipping functions.

/** Returns the drawing coordinates for a diagonal thin line.

    This function can be used for top-left to bottom-right and for bottom-left
    to top-right lines.

    @param rRect
        The reference rectangle of the diagonal frame border.
    @param bTLBR
        true = top-left to bottom-right; false = bottom-left to top-right.
    @param nDiagOffs
        Width offset (sub units) across the diagonal frame border.
    @return
        A struct containg start and end position of the diagonal line.
 */
LinePoints lclGetDiagLineEnds( const Rectangle& rRect, bool bTLBR, long nDiagOffs )
{
    LinePoints aPoints( rRect, bTLBR );
    bool bVert = rRect.GetWidth() < rRect.GetHeight();
    double fAngle = bVert ? GetVerDiagAngle( rRect ) : GetHorDiagAngle( rRect );
    // vertical top-left to bottom-right borders are handled mirrored
    if( bVert && bTLBR )
        nDiagOffs = -nDiagOffs;
    long nTOffs = bTLBR ? GetTLDiagOffset( 0, nDiagOffs, fAngle ) : GetTRDiagOffset( 0, nDiagOffs, fAngle );
    long nBOffs = bTLBR ? GetBRDiagOffset( 0, nDiagOffs, fAngle ) : GetBLDiagOffset( 0, nDiagOffs, fAngle );
    // vertical bottom-left to top-right borders are handled with exchanged end points
    if( bVert && !bTLBR )
        std::swap( nTOffs, nBOffs );
    (bVert ? aPoints.maBeg.Y() : aPoints.maBeg.X()) += lclToMapUnit( nTOffs );
    (bVert ? aPoints.maEnd.Y() : aPoints.maEnd.X()) += lclToMapUnit( nBOffs );
    return aPoints;
}

// ----------------------------------------------------------------------------
// Clipping functions for diagonal frame borders.

/** Limits the clipping region to the inner area of a rectange.

    Takes the values from the passed DiagLineResult struct into account. They
    may specify to not clip one or more borders of a rectangle.

    @param rDev
        The output device with the clipping region to be modified. The old
        clipping region is pushed onto the device's stack and can be restored
        with a call to OutputDevice::Pop(). Please take care about the correct
        calling order of Pop() if this function is used with other functions
        pushing something onto the stack.
    @param rRect
        The reference rectangle of the diagonal frame borders.
    @param rResult
        The result struct containing modifies for each border of the reference
        rectangle.
 */
void lclPushDiagClipRect( OutputDevice& rDev, const Rectangle& rRect, const DiagLineResult& rResult )
{
    // PixelToLogic() regards internal offset of the output device
    Rectangle aClipRect( rRect );
    aClipRect.Left()   += lclToMapUnit( rResult.mnLClip );
    aClipRect.Top()    += lclToMapUnit( rResult.mnTClip );
    aClipRect.Right()  += lclToMapUnit( rResult.mnRClip );
    aClipRect.Bottom() += lclToMapUnit( rResult.mnBClip );
    // output device would adjust the rectangle -> invalidate it before
    if( (aClipRect.GetWidth() < 1) ||(aClipRect.GetHeight() < 1) )
        aClipRect.SetEmpty();

    rDev.Push( PUSH_CLIPREGION );
    rDev.IntersectClipRegion( aClipRect );
}

/** Excludes inner area of a crossing double frame border from clipping region.

    This function is used to modify the clipping region so that it excludes the
    inner free area of a double diagonal frame border. This makes it possible
    to draw a diagonal frame border in one step without taking care of the
    crossing double frame border.

    @param rDev
        The output device with the clipping region to be modified. The old
        clipping region is pushed onto the device's stack and can be restored
        with a call to OutputDevice::Pop(). Please take care about the correct
        calling order of Pop() if this function is used with other functions
        pushing something onto the stack.
    @param rRect
        The reference rectangle of the diagonal frame borders.
    @param bTLBR
        The orientation of the processed frame border (not the orientation of
        the crossing frame border).
    @param bCrossStyle
        The style of the crossing frame border. Must be a double frame style.
 */
void lclPushCrossingClipRegion( OutputDevice& rDev, const Rectangle& rRect, bool bTLBR, const Style& rCrossStyle )
{
    DBG_ASSERT( rCrossStyle.Secn(), "lclGetCrossingClipRegion - use only for double styles" );
    LinePoints aLPoints( lclGetDiagLineEnds( rRect, !bTLBR, lclGetPrimEnd( rCrossStyle ) ) );
    LinePoints aRPoints( lclGetDiagLineEnds( rRect, !bTLBR, lclGetSecnBeg( rCrossStyle ) ) );

    Region aClipReg;
    if( bTLBR )
    {
        aClipReg = lclCreatePolygon(
            aLPoints.maBeg, aLPoints.maEnd, rRect.BottomRight(), rRect.BottomLeft(), rRect.TopLeft() );
        aClipReg.Union( lclCreatePolygon(
            aRPoints.maBeg, aRPoints.maEnd, rRect.BottomRight(), rRect.TopRight(), rRect.TopLeft() ) );
    }
    else
    {
        aClipReg = lclCreatePolygon(
            aLPoints.maBeg, aLPoints.maEnd, rRect.BottomLeft(), rRect.TopLeft(), rRect.TopRight() );
        aClipReg.Union( lclCreatePolygon(
            aRPoints.maBeg, aRPoints.maEnd, rRect.BottomLeft(), rRect.BottomRight(), rRect.TopRight() ) );
    }

    rDev.Push( PUSH_CLIPREGION );
    rDev.IntersectClipRegion( aClipReg );
}

// ----------------------------------------------------------------------------
// Drawing functions for diagonal frame borders.

/** Draws a diagonal thin or thick line into the passed output device.

    The clipping region of the output device is modified according to the
    passed DiagLineResult struct. A one pixel wide line can be drawn dotted.
 */
void lclDrawDiagLine(
        OutputDevice& rDev, const Rectangle& rRect, bool bTLBR,
        const DiagLineResult& rResult, long nDiagOffs1, long nDiagOffs2, bool bDotted )
{
    lclPushDiagClipRect( rDev, rRect, rResult );
    LinePoints aLPoints( lclGetDiagLineEnds( rRect, bTLBR, nDiagOffs1 ) );
    if( nDiagOffs1 == nDiagOffs2 )
        lclDrawThinLine( rDev, aLPoints, bDotted );
    else
        lclDrawPolygon( rDev, aLPoints, lclGetDiagLineEnds( rRect, bTLBR, nDiagOffs2 ) );
    rDev.Pop(); // clipping region
}

/** Draws a diagonal frame border into the passed output device.

    The lines of the frame border are drawn interrupted, if the style of the
    crossing frame border is double.

    @param rRect
        The reference rectangle of the diagonal frame border.
    @param bTLBR
        The orientation of the diagonal frame border.
    @param rBorder
        The frame style used to draw the border.
    @param rResult
        Offsets (sub units) to modify the clipping region of the output device.
    @param rCrossStyle
        Style of the crossing diagonal frame border.
 */
void lclDrawDiagFrameBorder(
        OutputDevice& rDev, const Rectangle& rRect, bool bTLBR,
        const Style& rBorder, const DiagBorderResult& rResult, const Style& rCrossStyle,
        const Color* pForceColor, bool bDiagDblClip )
{
    DBG_ASSERT( rBorder.Prim(), "svx::frame::lclDrawDiagFrameBorder - line not visible" );

    bool bClip = bDiagDblClip && rCrossStyle.Secn();
    if( bClip )
        lclPushCrossingClipRegion( rDev, rRect, bTLBR, rCrossStyle );

    lclSetColorToOutDev( rDev, rBorder, pForceColor );
    lclDrawDiagLine( rDev, rRect, bTLBR, rResult.maPrim, lclGetBeg( rBorder ), lclGetPrimEnd( rBorder ), rBorder.Dotted() );
    if( rBorder.Secn() )
        lclDrawDiagLine( rDev, rRect, bTLBR, rResult.maSecn, lclGetSecnBeg( rBorder ), lclGetEnd( rBorder ), rBorder.Dotted() );
    rDev.Pop(); // colors

    if( bClip )
        rDev.Pop(); // clipping region
}

/** Draws both diagonal frame borders into the passed output device.

    The lines of each frame border is drawn interrupted, if the style of the
    other crossing frame border is double.

    @param rRect
        The reference rectangle of the diagonal frame borders.
    @param rTLBR
        The frame style of the top-left to bottom-right frame border.
    @param rBLTR
        The frame style of the bottom-left to top-right frame border.
    @param rResult
        Offsets (sub units) to modify the clipping region of the output device.
 */
void lclDrawDiagFrameBorders(
        OutputDevice& rDev, const Rectangle& rRect,
        const Style& rTLBR, const Style& rBLTR, const DiagBordersResult& rResult,
        const Color* pForceColor, bool bDiagDblClip )
{
    DBG_ASSERT( (rRect.GetWidth() > 1) && (rRect.GetHeight() > 1), "svx::frame::lclDrawDiagFrameBorders - rectangle too small" );
    if( (rRect.GetWidth() > 1) && (rRect.GetHeight() > 1) )
    {
        bool bDrawTLBR = rTLBR.Prim() != 0;
        bool bDrawBLTR = rBLTR.Prim() != 0;
        bool bFirstDrawBLTR = rTLBR.Secn() != 0;

        if( bDrawBLTR && bFirstDrawBLTR )
            lclDrawDiagFrameBorder( rDev, rRect, false, rBLTR, rResult.maBLTR, rTLBR, pForceColor, bDiagDblClip );
        if( bDrawTLBR )
            lclDrawDiagFrameBorder( rDev, rRect, true, rTLBR, rResult.maTLBR, rBLTR, pForceColor, bDiagDblClip );
        if( bDrawBLTR && !bFirstDrawBLTR )
            lclDrawDiagFrameBorder( rDev, rRect, false, rBLTR, rResult.maBLTR, rTLBR, pForceColor, bDiagDblClip );
    }
}

// ============================================================================

} // namespace

// ============================================================================
// Classes
// ============================================================================

#define SCALEVALUE( value ) lclScaleValue( value, fScale, nMaxWidth )

void Style::Clear()
{
    Set( Color(), 0, 0, 0 );
}

void Style::Set( sal_uInt16 nP, sal_uInt16 nD, sal_uInt16 nS )
{
    /*  nP  nD  nS  ->  mnPrim  mnDist  mnSecn
        --------------------------------------
        any any 0       nP      0       0
        0   any >0      nS      0       0
        >0  0   >0      nP      0       0
        >0  >0  >0      nP      nD      nS
     */
    mnPrim = nP ? nP : nS;
    mnDist = (nP && nS) ? nD : 0;
    mnSecn = (nP && nD) ? nS : 0;
}

void Style::Set( const Color& rColor, sal_uInt16 nP, sal_uInt16 nD, sal_uInt16 nS )
{
    maColor = rColor;
    Set( nP, nD, nS );
}

void Style::Set( const SvxBorderLine& rBorder, double fScale, sal_uInt16 nMaxWidth, bool bUseDots )
{
    maColor = rBorder.GetColor();

    USHORT nPrim = rBorder.GetOutWidth();
    USHORT nDist = rBorder.GetDistance();
    USHORT nSecn = rBorder.GetInWidth();

    if( !nSecn )    // no or single frame border
    {
        Set( SCALEVALUE( nPrim ), 0, 0 );
        mbDotted = bUseDots && (0 < nPrim) && (nPrim < 10);
    }
    else
    {
        Set( SCALEVALUE( nPrim ), SCALEVALUE( nDist ), SCALEVALUE( nSecn ) );
        mbDotted = false;
        // Enlarge the style if distance is too small due to rounding losses.
        sal_uInt16 nPixWidth = SCALEVALUE( nPrim + nDist + nSecn );
        if( nPixWidth > GetWidth() )
            mnDist = nPixWidth - mnPrim - mnSecn;
        // Shrink the style if it is too thick for the control.
        while( GetWidth() > nMaxWidth )
        {
            // First decrease space between lines.
            if( mnDist )
                --mnDist;
            // Still too thick? Decrease the line widths.
            if( GetWidth() > nMaxWidth )
            {
                if( mnPrim && (mnPrim == mnSecn) )
                {
                    // Both lines equal - decrease both to keep symmetry.
                    --mnPrim;
                    --mnSecn;
                }
                else
                {
                    // Decrease each line for itself
                    if( mnPrim )
                        --mnPrim;
                    if( (GetWidth() > nMaxWidth) && mnSecn )
                        --mnSecn;
                }
            }
        }
    }
}

void Style::Set( const SvxBorderLine* pBorder, double fScale, sal_uInt16 nMaxWidth, bool bUseDots )
{
    if( pBorder )
        Set( *pBorder, fScale, nMaxWidth, bUseDots );
    else
    {
        Clear();
        mbDotted = false;
    }
}

Style& Style::ScaleSelf( double fScale, sal_uInt16 nMaxWidth )
{
    Set( SCALEVALUE( mnPrim ), SCALEVALUE( mnDist ), SCALEVALUE( mnSecn ) );
    return *this;
}

Style Style::Scale( double fScale, sal_uInt16 nMaxWidth ) const
{
    return Style( *this ).ScaleSelf( fScale, nMaxWidth );
}

Style& Style::MirrorSelf()
{
    if( mnSecn )
        std::swap( mnPrim, mnSecn );
    if( meRefMode != REFMODE_CENTERED )
        meRefMode = (meRefMode == REFMODE_BEGIN) ? REFMODE_END : REFMODE_BEGIN;
    return *this;
}

Style Style::Mirror() const
{
    return Style( *this ).MirrorSelf();
}

bool operator==( const Style& rL, const Style& rR )
{
    return (rL.Prim() == rR.Prim()) && (rL.Dist() == rR.Dist()) && (rL.Secn() == rR.Secn()) &&
        (rL.GetColor() == rR.GetColor()) && (rL.GetRefMode() == rR.GetRefMode()) && (rL.Dotted() == rR.Dotted());
}

bool operator<( const Style& rL, const Style& rR )
{
    // different total widths -> rL<rR, if rL is thinner
    sal_uInt16 nLW = rL.GetWidth();
    sal_uInt16 nRW = rR.GetWidth();
    if( nLW != nRW ) return nLW < nRW;

    // one line double, the other single -> rL<rR, if rL is single
    if( (rL.Secn() == 0) != (rR.Secn() == 0) ) return rL.Secn() == 0;

    // both lines double with different distances -> rL<rR, if distance of rL greater
    if( (rL.Secn() && rR.Secn()) && (rL.Dist() != rR.Dist()) ) return rL.Dist() > rR.Dist();

    // both lines single and 1 unit thick, only one is dotted -> rL<rR, if rL is dotted
    if( (nLW == 1) && (rL.Dotted() != rR.Dotted()) ) return rL.Dotted();

    // seem to be equal
    return false;
}

#undef SCALEVALUE

// ============================================================================
// Various helper functions
// ============================================================================

double GetHorDiagAngle( long nWidth, long nHeight )
{
    return atan2( static_cast< double >( Abs( nHeight ) ), static_cast< double >( Abs( nWidth ) ) );
}

// ============================================================================

long GetTLDiagOffset( long nVerOffs, long nDiagOffs, double fAngle )
{
    return lclD2L( nVerOffs / tan( fAngle ) + nDiagOffs / sin( fAngle ) );
}

long GetBLDiagOffset( long nVerOffs, long nDiagOffs, double fAngle )
{
    return lclD2L( -nVerOffs / tan( fAngle ) + nDiagOffs / sin( fAngle ) );
}

long GetBRDiagOffset( long nVerOffs, long nDiagOffs, double fAngle )
{
    return -lclD2L( -nVerOffs / tan( fAngle ) - nDiagOffs / sin( fAngle ) );
}

long GetTRDiagOffset( long nVerOffs, long nDiagOffs, double fAngle )
{
    return -lclD2L( nVerOffs / tan( fAngle ) - nDiagOffs / sin( fAngle ) );
}

// ============================================================================

bool CheckFrameBorderConnectable( const Style& rLBorder, const Style& rRBorder,
        const Style& rTFromTL, const Style& rTFromT, const Style& rTFromTR,
        const Style& rBFromBL, const Style& rBFromB, const Style& rBFromBR )
{
    return      // returns 1 AND (2a OR 2b)
        // 1) only, if both frame borders are equal
        (rLBorder == rRBorder)
        &&
        (
            (
                // 2a) if the borders are not double, at least one of the vertical must not be double
                !rLBorder.Secn() && (!rTFromT.Secn() || !rBFromB.Secn())
            )
            ||
            (
                // 2b) if the borders are double, all other borders must not be double
                rLBorder.Secn() &&
                !rTFromTL.Secn() && !rTFromT.Secn() && !rTFromTR.Secn() &&
                !rBFromBL.Secn() && !rBFromB.Secn() && !rBFromBR.Secn()
            )
        );
}

// ============================================================================
// Drawing functions
// ============================================================================

void DrawHorFrameBorder( OutputDevice& rDev,
        const Point& rLPos, const Point& rRPos, const Style& rBorder,
        const DiagStyle& rLFromTR, const Style& rLFromT, const Style& rLFromL, const Style& rLFromB, const DiagStyle& rLFromBR,
        const DiagStyle& rRFromTL, const Style& rRFromT, const Style& rRFromR, const Style& rRFromB, const DiagStyle& rRFromBL,
        const Color* pForceColor )
{
    if( rBorder.Prim() )
    {
        BorderResult aResult;
        lclLinkHorFrameBorder( aResult, rBorder,
            rLFromTR, rLFromT, rLFromL, rLFromB, rLFromBR,
            rRFromTL, rRFromT, rRFromR, rRFromB, rRFromBL );
        lclDrawHorFrameBorder( rDev, rLPos, rRPos, rBorder, aResult, pForceColor );
    }
}

void DrawHorFrameBorder( OutputDevice& rDev,
        const Point& rLPos, const Point& rRPos, const Style& rBorder,
        const Style& rLFromT, const Style& rLFromL, const Style& rLFromB,
        const Style& rRFromT, const Style& rRFromR, const Style& rRFromB,
        const Color* pForceColor )
{
    /*  Recycle complex version of the DrawHorFrameBorder() function with empty diagonals. */
    const DiagStyle aNoStyle;
    DrawHorFrameBorder(
        rDev, rLPos, rRPos, rBorder,
        aNoStyle, rLFromT, rLFromL, rLFromB, aNoStyle,
        aNoStyle, rRFromT, rRFromR, rRFromB, aNoStyle,
        pForceColor );
}

void DrawHorFrameBorder( OutputDevice& rDev,
        const Point& rLPos, const Point& rRPos, const Style& rBorder, const Color* pForceColor )
{
    if( rBorder.Prim() )
        lclDrawHorFrameBorder( rDev, rLPos, rRPos, rBorder, BorderResult(), pForceColor );
}

// ----------------------------------------------------------------------------

void DrawVerFrameBorder( OutputDevice& rDev,
        const Point& rTPos, const Point& rBPos, const Style& rBorder,
        const DiagStyle& rTFromBL, const Style& rTFromL, const Style& rTFromT, const Style& rTFromR, const DiagStyle& rTFromBR,
        const DiagStyle& rBFromTL, const Style& rBFromL, const Style& rBFromB, const Style& rBFromR, const DiagStyle& rBFromTR,
        const Color* pForceColor )
{
    if( rBorder.Prim() )
    {
        BorderResult aResult;
        lclLinkVerFrameBorder( aResult, rBorder,
            rTFromBL, rTFromL, rTFromT, rTFromR, rTFromBR,
            rBFromTL, rBFromL, rBFromB, rBFromR, rBFromTR );
        lclDrawVerFrameBorder( rDev, rTPos, rBPos, rBorder, aResult, pForceColor );
    }
}

void DrawVerFrameBorder( OutputDevice& rDev,
        const Point& rTPos, const Point& rBPos, const Style& rBorder,
        const Style& rTFromL, const Style& rTFromT, const Style& rTFromR,
        const Style& rBFromL, const Style& rBFromB, const Style& rBFromR,
        const Color* pForceColor )
{
    /*  Recycle complex version of the DrawVerFrameBorder() function with empty diagonals. */
    const DiagStyle aNoStyle;
    DrawVerFrameBorder(
        rDev, rTPos, rBPos, rBorder,
        aNoStyle, rTFromL, rTFromT, rTFromR, aNoStyle,
        aNoStyle, rBFromL, rBFromB, rBFromR, aNoStyle,
        pForceColor );
}

void DrawVerFrameBorder( OutputDevice& rDev,
        const Point& rTPos, const Point& rBPos, const Style& rBorder, const Color* pForceColor )
{
    if( rBorder.Prim() )
        lclDrawVerFrameBorder( rDev, rTPos, rBPos, rBorder, BorderResult(), pForceColor );
}

// ----------------------------------------------------------------------------

void DrawVerFrameBorderSlanted( OutputDevice& rDev,
        const Point& rTPos, const Point& rBPos, const Style& rBorder, const Color* pForceColor )
{
    DBG_ASSERT( rTPos.Y() < rBPos.Y(), "svx::frame::DrawVerFrameBorderSlanted - wrong order of line ends" );
    if( rBorder.Prim() && (rTPos.Y() < rBPos.Y()) )
    {
        if( rTPos.X() == rBPos.X() )
        {
            DrawVerFrameBorder( rDev, rTPos, rBPos, rBorder, pForceColor );
        }
        else
        {
            const LineEndResult aRes;

            Style aScaled( rBorder );
            aScaled.ScaleSelf( 1.0 / cos( GetVerDiagAngle( rTPos, rBPos ) ) );

            lclSetColorToOutDev( rDev, aScaled, pForceColor );
            lclDrawVerLine( rDev, rTPos, aRes, rBPos, aRes,
                lclGetBeg( aScaled ), lclGetPrimEnd( aScaled ), aScaled.Dotted() );
            if( aScaled.Secn() )
                lclDrawVerLine( rDev, rTPos, aRes, rBPos, aRes,
                    lclGetSecnBeg( aScaled ), lclGetEnd( aScaled ), aScaled.Dotted() );
            rDev.Pop(); // colors
        }
    }
}

// ============================================================================

void DrawDiagFrameBorders(
        OutputDevice& rDev, const Rectangle& rRect, const Style& rTLBR, const Style& rBLTR,
        const Style& rTLFromB, const Style& rTLFromR, const Style& rBRFromT, const Style& rBRFromL,
        const Style& rBLFromT, const Style& rBLFromR, const Style& rTRFromB, const Style& rTRFromL,
        const Color* pForceColor, bool bDiagDblClip )
{
    if( rTLBR.Prim() || rBLTR.Prim() )
    {
        DiagBordersResult aResult;
        lclLinkDiagFrameBorders( aResult, rTLBR, rBLTR,
            rTLFromB, rTLFromR, rBRFromT, rBRFromL, rBLFromT, rBLFromR, rTRFromB, rTRFromL );
        lclDrawDiagFrameBorders( rDev, rRect, rTLBR, rBLTR, aResult, pForceColor, bDiagDblClip );
    }
}

// ============================================================================

} // namespace frame
} // namespace svx