summaryrefslogtreecommitdiffstats
path: root/generic/tkCanvPoly.c
blob: 92375b9544cf08c2ab19f744822b5340e89ff779 (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
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
/*
 * tkCanvPoly.c --
 *
 *	This file implements polygon items for canvas widgets.
 *
 * Copyright (c) 1991-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 * Copyright (c) 1998-2000 Ajuba Solutions.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tkCanvPoly.c,v 1.18 2007/12/13 15:24:13 dgp Exp $
 */

#include <stdio.h>
#include "tkInt.h"
#include "tkCanvas.h"

/*
 * The structure below defines the record for each polygon item.
 */

typedef struct PolygonItem  {
    Tk_Item header;		/* Generic stuff that's the same for all
				 * types. MUST BE FIRST IN STRUCTURE. */
    Tk_Outline outline;		/* Outline structure */
    int numPoints;		/* Number of points in polygon. Polygon is
				 * always closed. */
    int pointsAllocated;	/* Number of points for which space is
				 * allocated at *coordPtr. */
    double *coordPtr;		/* Pointer to malloc-ed array containing x-
				 * and y-coords of all points in polygon.
				 * X-coords are even-valued indices, y-coords
				 * are corresponding odd-valued indices. */
    int joinStyle;		/* Join style for outline */
    Tk_TSOffset tsoffset;
    XColor *fillColor;		/* Foreground color for polygon. */
    XColor *activeFillColor;	/* Foreground color for polygon if state is
				 * active. */
    XColor *disabledFillColor;	/* Foreground color for polygon if state is
				 * disabled. */
    Pixmap fillStipple;		/* Stipple bitmap for filling polygon. */
    Pixmap activeFillStipple;	/* Stipple bitmap for filling polygon if state
				 * is active. */
    Pixmap disabledFillStipple;	/* Stipple bitmap for filling polygon if state
				 * is disabled. */
    GC fillGC;			/* Graphics context for filling polygon. */
    Tk_SmoothMethod *smooth;	/* Non-zero means draw shape smoothed (i.e.
				 * with Bezier splines). */
    int splineSteps;		/* Number of steps in each spline segment. */
    int autoClosed;		/* Zero means the given polygon was closed,
				   one means that we auto closed it. */
} PolygonItem;

/*
 * Information used for parsing configuration specs:
 */

static Tk_CustomOption smoothOption = {
    (Tk_OptionParseProc *) TkSmoothParseProc,
    TkSmoothPrintProc, (ClientData) NULL
};
static Tk_CustomOption stateOption = {
    (Tk_OptionParseProc *) TkStateParseProc,
    TkStatePrintProc, (ClientData) 2
};
static Tk_CustomOption tagsOption = {
    (Tk_OptionParseProc *) Tk_CanvasTagsParseProc,
    Tk_CanvasTagsPrintProc, (ClientData) NULL
};
static Tk_CustomOption dashOption = {
    (Tk_OptionParseProc *) TkCanvasDashParseProc,
    TkCanvasDashPrintProc, (ClientData) NULL
};
static Tk_CustomOption offsetOption = {
    (Tk_OptionParseProc *) TkOffsetParseProc,
    TkOffsetPrintProc,
    (ClientData) (TK_OFFSET_RELATIVE|TK_OFFSET_INDEX)
};
static Tk_CustomOption pixelOption = {
    (Tk_OptionParseProc *) TkPixelParseProc,
    TkPixelPrintProc, (ClientData) NULL
};

static Tk_ConfigSpec configSpecs[] = {
    {TK_CONFIG_CUSTOM, "-activedash", NULL, NULL,
	NULL, Tk_Offset(PolygonItem, outline.activeDash),
	TK_CONFIG_NULL_OK, &dashOption},
    {TK_CONFIG_COLOR, "-activefill", NULL, NULL,
	NULL, Tk_Offset(PolygonItem, activeFillColor), TK_CONFIG_NULL_OK},
    {TK_CONFIG_COLOR, "-activeoutline", NULL, NULL,
	NULL, Tk_Offset(PolygonItem, outline.activeColor), TK_CONFIG_NULL_OK},
    {TK_CONFIG_BITMAP, "-activeoutlinestipple", NULL, NULL,
	NULL, Tk_Offset(PolygonItem, outline.activeStipple),
	TK_CONFIG_NULL_OK},
    {TK_CONFIG_BITMAP, "-activestipple", NULL, NULL,
	NULL, Tk_Offset(PolygonItem, activeFillStipple), TK_CONFIG_NULL_OK},
    {TK_CONFIG_CUSTOM, "-activewidth", NULL, NULL,
	"0.0", Tk_Offset(PolygonItem, outline.activeWidth),
	TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
    {TK_CONFIG_CUSTOM, "-dash", NULL, NULL,
	NULL, Tk_Offset(PolygonItem, outline.dash),
	TK_CONFIG_NULL_OK, &dashOption},
    {TK_CONFIG_PIXELS, "-dashoffset", NULL, NULL,
	"0", Tk_Offset(PolygonItem, outline.offset),
	TK_CONFIG_DONT_SET_DEFAULT},
    {TK_CONFIG_CUSTOM, "-disableddash", NULL, NULL,
	NULL, Tk_Offset(PolygonItem, outline.disabledDash),
	TK_CONFIG_NULL_OK, &dashOption},
    {TK_CONFIG_COLOR, "-disabledfill", NULL, NULL,
	NULL, Tk_Offset(PolygonItem, disabledFillColor), TK_CONFIG_NULL_OK},
    {TK_CONFIG_COLOR, "-disabledoutline", NULL, NULL,
	NULL, Tk_Offset(PolygonItem, outline.disabledColor),
	TK_CONFIG_NULL_OK},
    {TK_CONFIG_BITMAP, "-disabledoutlinestipple", NULL, NULL,
	NULL, Tk_Offset(PolygonItem, outline.disabledStipple),
	TK_CONFIG_NULL_OK},
    {TK_CONFIG_BITMAP, "-disabledstipple", NULL, NULL,
	NULL, Tk_Offset(PolygonItem, disabledFillStipple), TK_CONFIG_NULL_OK},
    {TK_CONFIG_CUSTOM, "-disabledwidth", NULL, NULL,
	"0.0", Tk_Offset(PolygonItem, outline.disabledWidth),
	TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
    {TK_CONFIG_COLOR, "-fill", NULL, NULL,
	"black", Tk_Offset(PolygonItem, fillColor), TK_CONFIG_NULL_OK},
    {TK_CONFIG_JOIN_STYLE, "-joinstyle", NULL, NULL,
	"round", Tk_Offset(PolygonItem, joinStyle), TK_CONFIG_DONT_SET_DEFAULT},
    {TK_CONFIG_CUSTOM, "-offset", NULL, NULL,
	"0,0", Tk_Offset(PolygonItem, tsoffset),
	TK_CONFIG_NULL_OK, &offsetOption},
    {TK_CONFIG_COLOR, "-outline", NULL, NULL,
	NULL, Tk_Offset(PolygonItem, outline.color), TK_CONFIG_NULL_OK},
    {TK_CONFIG_CUSTOM, "-outlineoffset", NULL, NULL,
	"0,0", Tk_Offset(PolygonItem, outline.tsoffset),
	TK_CONFIG_NULL_OK, &offsetOption},
    {TK_CONFIG_BITMAP, "-outlinestipple", NULL, NULL,
	NULL, Tk_Offset(PolygonItem, outline.stipple), TK_CONFIG_NULL_OK},
    {TK_CONFIG_CUSTOM, "-smooth", NULL, NULL,
	"0", Tk_Offset(PolygonItem, smooth),
	TK_CONFIG_DONT_SET_DEFAULT, &smoothOption},
    {TK_CONFIG_INT, "-splinesteps", NULL, NULL,
	"12", Tk_Offset(PolygonItem, splineSteps), TK_CONFIG_DONT_SET_DEFAULT},
    {TK_CONFIG_CUSTOM, "-state", NULL, NULL,
	NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK, &stateOption},
    {TK_CONFIG_BITMAP, "-stipple", NULL, NULL,
	NULL, Tk_Offset(PolygonItem, fillStipple), TK_CONFIG_NULL_OK},
    {TK_CONFIG_CUSTOM, "-tags", NULL, NULL,
	NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
    {TK_CONFIG_CUSTOM, "-width", NULL, NULL,
	"1.0", Tk_Offset(PolygonItem, outline.width),
	TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
    {TK_CONFIG_END, NULL, NULL, NULL, NULL, 0, 0}
};

/*
 * Prototypes for functions defined in this file:
 */

static void		ComputePolygonBbox(Tk_Canvas canvas,
			    PolygonItem *polyPtr);
static int		ConfigurePolygon(Tcl_Interp *interp,
			    Tk_Canvas canvas, Tk_Item *itemPtr, int objc,
			    Tcl_Obj *CONST objv[], int flags);
static int		CreatePolygon(Tcl_Interp *interp,
			    Tk_Canvas canvas, struct Tk_Item *itemPtr,
			    int objc, Tcl_Obj *CONST objv[]);
static void		DeletePolygon(Tk_Canvas canvas,
			    Tk_Item *itemPtr,  Display *display);
static void		DisplayPolygon(Tk_Canvas canvas,
			    Tk_Item *itemPtr, Display *display, Drawable dst,
			    int x, int y, int width, int height);
static int		GetPolygonIndex(Tcl_Interp *interp,
			    Tk_Canvas canvas, Tk_Item *itemPtr,
			    Tcl_Obj *obj, int *indexPtr);
static int		PolygonCoords(Tcl_Interp *interp,
			    Tk_Canvas canvas, Tk_Item *itemPtr,
			    int objc, Tcl_Obj *CONST objv[]);
static void		PolygonDeleteCoords(Tk_Canvas canvas,
			    Tk_Item *itemPtr, int first, int last);
static void		PolygonInsert(Tk_Canvas canvas,
			    Tk_Item *itemPtr, int beforeThis, Tcl_Obj *obj);
static int		PolygonToArea(Tk_Canvas canvas,
			    Tk_Item *itemPtr, double *rectPtr);
static double		PolygonToPoint(Tk_Canvas canvas,
			    Tk_Item *itemPtr, double *pointPtr);
static int		PolygonToPostscript(Tcl_Interp *interp,
			    Tk_Canvas canvas, Tk_Item *itemPtr, int prepass);
static void		ScalePolygon(Tk_Canvas canvas,
			    Tk_Item *itemPtr, double originX, double originY,
			    double scaleX, double scaleY);
static void		TranslatePolygon(Tk_Canvas canvas,
			    Tk_Item *itemPtr, double deltaX, double deltaY);

/*
 * The structures below defines the polygon item type by means of functions
 * that can be invoked by generic item code.
 */

Tk_ItemType tkPolygonType = {
    "polygon",				/* name */
    sizeof(PolygonItem),		/* itemSize */
    CreatePolygon,			/* createProc */
    configSpecs,			/* configSpecs */
    ConfigurePolygon,			/* configureProc */
    PolygonCoords,			/* coordProc */
    DeletePolygon,			/* deleteProc */
    DisplayPolygon,			/* displayProc */
    TK_CONFIG_OBJS,			/* flags */
    PolygonToPoint,			/* pointProc */
    PolygonToArea,			/* areaProc */
    PolygonToPostscript,		/* postscriptProc */
    ScalePolygon,			/* scaleProc */
    TranslatePolygon,			/* translateProc */
    (Tk_ItemIndexProc *) GetPolygonIndex,/* indexProc */
    NULL,				/* icursorProc */
    NULL,				/* selectionProc */
    (Tk_ItemInsertProc *) PolygonInsert,/* insertProc */
    PolygonDeleteCoords,		/* dTextProc */
    NULL,				/* nextPtr */
};

/*
 * The definition below determines how large are static arrays used to hold
 * spline points (splines larger than this have to have their arrays
 * malloc-ed).
 */

#define MAX_STATIC_POINTS 200

/*
 *--------------------------------------------------------------
 *
 * CreatePolygon --
 *
 *	This function is invoked to create a new polygon item in a canvas.
 *
 * Results:
 *	A standard Tcl return value. If an error occurred in creating the
 *	item, then an error message is left in the interp's result; in this
 *	case itemPtr is left uninitialized, so it can be safely freed by the
 *	caller.
 *
 * Side effects:
 *	A new polygon item is created.
 *
 *--------------------------------------------------------------
 */

static int
CreatePolygon(
    Tcl_Interp *interp,		/* Interpreter for error reporting. */
    Tk_Canvas canvas,		/* Canvas to hold new item. */
    Tk_Item *itemPtr,		/* Record to hold new item; header has been
				 * initialized by caller. */
    int objc,			/* Number of arguments in objv. */
    Tcl_Obj *CONST objv[])	/* Arguments describing polygon. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    int i;

    if (objc == 0) {
	Tcl_Panic("canvas did not pass any coords\n");
    }

    /*
     * Carry out initialization that is needed in order to clean up after
     * errors during the the remainder of this function.
     */

    Tk_CreateOutline(&(polyPtr->outline));
    polyPtr->numPoints = 0;
    polyPtr->pointsAllocated = 0;
    polyPtr->coordPtr = NULL;
    polyPtr->joinStyle = JoinRound;
    polyPtr->tsoffset.flags = 0;
    polyPtr->tsoffset.xoffset = 0;
    polyPtr->tsoffset.yoffset = 0;
    polyPtr->fillColor = NULL;
    polyPtr->activeFillColor = NULL;
    polyPtr->disabledFillColor = NULL;
    polyPtr->fillStipple = None;
    polyPtr->activeFillStipple = None;
    polyPtr->disabledFillStipple = None;
    polyPtr->fillGC = None;
    polyPtr->smooth = NULL;
    polyPtr->splineSteps = 12;
    polyPtr->autoClosed = 0;

    /*
     * Count the number of points and then parse them into a point array.
     * Leading arguments are assumed to be points if they start with a digit
     * or a minus sign followed by a digit.
     */

    for (i = 0; i < objc; i++) {
	char *arg = Tcl_GetString(objv[i]);
	if ((arg[0] == '-') && (arg[1] >= 'a') && (arg[1] <= 'z')) {
	    break;
	}
    }
    if (i && PolygonCoords(interp, canvas, itemPtr, i, objv) != TCL_OK) {
	goto error;
    }

    if (ConfigurePolygon(interp, canvas, itemPtr, objc-i, objv+i, 0)
	    == TCL_OK) {
	return TCL_OK;
    }

  error:
    DeletePolygon(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
    return TCL_ERROR;
}

/*
 *--------------------------------------------------------------
 *
 * PolygonCoords --
 *
 *	This function is invoked to process the "coords" widget command on
 *	polygons. See the user documentation for details on what it does.
 *
 * Results:
 *	Returns TCL_OK or TCL_ERROR, and sets the interp's result.
 *
 * Side effects:
 *	The coordinates for the given item may be changed.
 *
 *--------------------------------------------------------------
 */

static int
PolygonCoords(
    Tcl_Interp *interp,		/* Used for error reporting. */
    Tk_Canvas canvas,		/* Canvas containing item. */
    Tk_Item *itemPtr,		/* Item whose coordinates are to be read or
				 * modified. */
    int objc,			/* Number of coordinates supplied in objv. */
    Tcl_Obj *CONST objv[])	/* Array of coordinates: x1, y1, x2, y2, ... */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    int i, numPoints;

    if (objc == 0) {
	/*
	 * Print the coords used to create the polygon. If we auto closed the
	 * polygon then we don't report the last point.
	 */

	Tcl_Obj *subobj, *obj = Tcl_NewObj();

	for (i = 0; i < 2*(polyPtr->numPoints - polyPtr->autoClosed); i++) {
	    subobj = Tcl_NewDoubleObj(polyPtr->coordPtr[i]);
	    Tcl_ListObjAppendElement(interp, obj, subobj);
	}
	Tcl_SetObjResult(interp, obj);
	return TCL_OK;
    }
    if (objc == 1) {
	if (Tcl_ListObjGetElements(interp, objv[0], &objc,
		(Tcl_Obj ***) &objv) != TCL_OK) {
	    return TCL_ERROR;
	}
    }
    if (objc & 1) {
	char buf[64 + TCL_INTEGER_SPACE];

	sprintf(buf, "wrong # coordinates: expected an even number, got %d",
		objc);
	Tcl_SetResult(interp, buf, TCL_VOLATILE);
	return TCL_ERROR;
    } else {
	numPoints = objc/2;
	if (polyPtr->pointsAllocated <= numPoints) {
	    if (polyPtr->coordPtr != NULL) {
		ckfree((char *) polyPtr->coordPtr);
	    }

	    /*
	     * One extra point gets allocated here, because we always add
	     * another point to close the polygon.
	     */

	    polyPtr->coordPtr = (double *) ckalloc((unsigned)
		    (sizeof(double) * (objc+2)));
	    polyPtr->pointsAllocated = numPoints+1;
	}
	for (i = objc-1; i >= 0; i--) {
	    if (Tk_CanvasGetCoordFromObj(interp, canvas, objv[i],
		    &polyPtr->coordPtr[i]) != TCL_OK) {
		return TCL_ERROR;
	    }
	}
	polyPtr->numPoints = numPoints;
	polyPtr->autoClosed = 0;

	/*
	 * Close the polygon if it isn't already closed.
	 */

	if (objc>2 && ((polyPtr->coordPtr[objc-2] != polyPtr->coordPtr[0])
		|| (polyPtr->coordPtr[objc-1] != polyPtr->coordPtr[1]))) {
	    polyPtr->autoClosed = 1;
	    polyPtr->numPoints++;
	    polyPtr->coordPtr[objc] = polyPtr->coordPtr[0];
	    polyPtr->coordPtr[objc+1] = polyPtr->coordPtr[1];
	}
	ComputePolygonBbox(canvas, polyPtr);
    }
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * ConfigurePolygon --
 *
 *	This function is invoked to configure various aspects of a polygon
 *	item such as its background color.
 *
 * Results:
 *	A standard Tcl result code. If an error occurs, then an error message
 *	is left in the interp's result.
 *
 * Side effects:
 *	Configuration information, such as colors and stipple patterns, may be
 *	set for itemPtr.
 *
 *--------------------------------------------------------------
 */

static int
ConfigurePolygon(
    Tcl_Interp *interp,		/* Interpreter for error reporting. */
    Tk_Canvas canvas,		/* Canvas containing itemPtr. */
    Tk_Item *itemPtr,		/* Polygon item to reconfigure. */
    int objc,			/* Number of elements in objv.  */
    Tcl_Obj *CONST objv[],	/* Arguments describing things to configure. */
    int flags)			/* Flags to pass to Tk_ConfigureWidget. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    XGCValues gcValues;
    GC newGC;
    unsigned long mask;
    Tk_Window tkwin;
    XColor *color;
    Pixmap stipple;
    Tk_State state;

    tkwin = Tk_CanvasTkwin(canvas);
    if (TCL_OK != Tk_ConfigureWidget(interp, tkwin, configSpecs, objc,
	    (CONST char **) objv, (char *) polyPtr, flags|TK_CONFIG_OBJS)) {
	return TCL_ERROR;
    }

    /*
     * A few of the options require additional processing, such as graphics
     * contexts.
     */

    state = itemPtr->state;

    if (polyPtr->outline.activeWidth > polyPtr->outline.width ||
	    polyPtr->outline.activeDash.number != 0 ||
	    polyPtr->outline.activeColor != NULL ||
	    polyPtr->outline.activeStipple != None ||
	    polyPtr->activeFillColor != NULL ||
	    polyPtr->activeFillStipple != None) {
	itemPtr->redraw_flags |= TK_ITEM_STATE_DEPENDANT;
    } else {
	itemPtr->redraw_flags &= ~TK_ITEM_STATE_DEPENDANT;
    }

    if(state == TK_STATE_NULL) {
	state = ((TkCanvas *)canvas)->canvas_state;
    }
    if (state==TK_STATE_HIDDEN) {
	ComputePolygonBbox(canvas, polyPtr);
	return TCL_OK;
    }

    mask = Tk_ConfigOutlineGC(&gcValues, canvas, itemPtr, &(polyPtr->outline));
    if (mask) {
	gcValues.cap_style = CapRound;
	gcValues.join_style = polyPtr->joinStyle;
	mask |= GCCapStyle|GCJoinStyle;
	newGC = Tk_GetGC(tkwin, mask, &gcValues);
    } else {
	newGC = None;
    }
    if (polyPtr->outline.gc != None) {
	Tk_FreeGC(Tk_Display(tkwin), polyPtr->outline.gc);
    }
    polyPtr->outline.gc = newGC;

    color = polyPtr->fillColor;
    stipple = polyPtr->fillStipple;
    if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
	if (polyPtr->activeFillColor!=NULL) {
	    color = polyPtr->activeFillColor;
	}
	if (polyPtr->activeFillStipple!=None) {
	    stipple = polyPtr->activeFillStipple;
	}
    } else if (state==TK_STATE_DISABLED) {
	if (polyPtr->disabledFillColor!=NULL) {
	    color = polyPtr->disabledFillColor;
	}
	if (polyPtr->disabledFillStipple!=None) {
	    stipple = polyPtr->disabledFillStipple;
	}
    }

    if (color == NULL) {
	newGC = None;
    } else {
	gcValues.foreground = color->pixel;
	mask = GCForeground;
	if (stipple != None) {
	    gcValues.stipple = stipple;
	    gcValues.fill_style = FillStippled;
	    mask |= GCStipple|GCFillStyle;
	}
#ifdef MAC_OSX_TK
	/*
	 * Mac OS X CG drawing needs access to the outline linewidth
	 * even for fills (as linewidth controls antialiasing).
	 */
	gcValues.line_width = polyPtr->outline.gc != None ? 
		polyPtr->outline.gc->line_width : 0;
	mask |= GCLineWidth;
#endif
	newGC = Tk_GetGC(tkwin, mask, &gcValues);
    }
    if (polyPtr->fillGC != None) {
	Tk_FreeGC(Tk_Display(tkwin), polyPtr->fillGC);
    }
    polyPtr->fillGC = newGC;

    /*
     * Keep spline parameters within reasonable limits.
     */

    if (polyPtr->splineSteps < 1) {
	polyPtr->splineSteps = 1;
    } else if (polyPtr->splineSteps > 100) {
	polyPtr->splineSteps = 100;
    }

    ComputePolygonBbox(canvas, polyPtr);
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * DeletePolygon --
 *
 *	This function is called to clean up the data structure associated with
 *	a polygon item.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Resources associated with itemPtr are released.
 *
 *--------------------------------------------------------------
 */

static void
DeletePolygon(
    Tk_Canvas canvas,		/* Info about overall canvas widget. */
    Tk_Item *itemPtr,		/* Item that is being deleted. */
    Display *display)		/* Display containing window for canvas. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;

    Tk_DeleteOutline(display,&(polyPtr->outline));
    if (polyPtr->coordPtr != NULL) {
	ckfree((char *) polyPtr->coordPtr);
    }
    if (polyPtr->fillColor != NULL) {
	Tk_FreeColor(polyPtr->fillColor);
    }
    if (polyPtr->activeFillColor != NULL) {
	Tk_FreeColor(polyPtr->activeFillColor);
    }
    if (polyPtr->disabledFillColor != NULL) {
	Tk_FreeColor(polyPtr->disabledFillColor);
    }
    if (polyPtr->fillStipple != None) {
	Tk_FreeBitmap(display, polyPtr->fillStipple);
    }
    if (polyPtr->activeFillStipple != None) {
	Tk_FreeBitmap(display, polyPtr->activeFillStipple);
    }
    if (polyPtr->disabledFillStipple != None) {
	Tk_FreeBitmap(display, polyPtr->disabledFillStipple);
    }
    if (polyPtr->fillGC != None) {
	Tk_FreeGC(display, polyPtr->fillGC);
    }
}

/*
 *--------------------------------------------------------------
 *
 * ComputePolygonBbox --
 *
 *	This function is invoked to compute the bounding box of all the pixels
 *	that may be drawn as part of a polygon.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The fields x1, y1, x2, and y2 are updated in the header for itemPtr.
 *
 *--------------------------------------------------------------
 */

static void
ComputePolygonBbox(
    Tk_Canvas canvas,		/* Canvas that contains item. */
    PolygonItem *polyPtr)	/* Item whose bbox is to be recomputed. */
{
    double *coordPtr;
    int i;
    double width;
    Tk_State state = polyPtr->header.state;
    Tk_TSOffset *tsoffset;

    if(state == TK_STATE_NULL) {
	state = ((TkCanvas *)canvas)->canvas_state;
    }
    width = polyPtr->outline.width;
    if (polyPtr->coordPtr == NULL || (polyPtr->numPoints < 1) || (state==TK_STATE_HIDDEN)) {
	polyPtr->header.x1 = polyPtr->header.x2 =
	polyPtr->header.y1 = polyPtr->header.y2 = -1;
	return;
    }
    if (((TkCanvas *)canvas)->currentItemPtr == (Tk_Item *)polyPtr) {
	if (polyPtr->outline.activeWidth>width) {
	    width = polyPtr->outline.activeWidth;
	}
    } else if (state==TK_STATE_DISABLED) {
	if (polyPtr->outline.disabledWidth>0.0) {
	    width = polyPtr->outline.disabledWidth;
	}
    }

    coordPtr = polyPtr->coordPtr;
    polyPtr->header.x1 = polyPtr->header.x2 = (int) *coordPtr;
    polyPtr->header.y1 = polyPtr->header.y2 = (int) coordPtr[1];

    /*
     * Compute the bounding box of all the points in the polygon, then expand
     * in all directions by the outline's width to take care of butting or
     * rounded corners and projecting or rounded caps. This expansion is an
     * overestimate (worst-case is square root of two over two) but it's
     * simple. Don't do anything special for curves. This causes an additional
     * overestimate in the bounding box, but is faster.
     */

    for (i = 1, coordPtr = polyPtr->coordPtr+2; i < polyPtr->numPoints-1;
	    i++, coordPtr += 2) {
	TkIncludePoint((Tk_Item *) polyPtr, coordPtr);
    }

    tsoffset = &polyPtr->tsoffset;
    if (tsoffset->flags & TK_OFFSET_INDEX) {
	int index = tsoffset->flags & ~TK_OFFSET_INDEX;
	if (tsoffset->flags == INT_MAX) {
	    index = (polyPtr->numPoints - polyPtr->autoClosed) * 2;
	    if (index < 0) {
		index = 0;
	    }
	}
	index %= (polyPtr->numPoints - polyPtr->autoClosed) * 2;
	if (index <0) {
	    index += (polyPtr->numPoints - polyPtr->autoClosed) * 2;
	}
 	tsoffset->xoffset = (int) (polyPtr->coordPtr[index] + 0.5);
	tsoffset->yoffset = (int) (polyPtr->coordPtr[index+1] + 0.5);
    } else {
	if (tsoffset->flags & TK_OFFSET_LEFT) {
	    tsoffset->xoffset = polyPtr->header.x1;
	} else if (tsoffset->flags & TK_OFFSET_CENTER) {
	    tsoffset->xoffset = (polyPtr->header.x1 + polyPtr->header.x2)/2;
	} else if (tsoffset->flags & TK_OFFSET_RIGHT) {
	    tsoffset->xoffset = polyPtr->header.x2;
	}
	if (tsoffset->flags & TK_OFFSET_TOP) {
	    tsoffset->yoffset = polyPtr->header.y1;
	} else if (tsoffset->flags & TK_OFFSET_MIDDLE) {
	    tsoffset->yoffset = (polyPtr->header.y1 + polyPtr->header.y2)/2;
	} else if (tsoffset->flags & TK_OFFSET_BOTTOM) {
	    tsoffset->yoffset = polyPtr->header.y2;
	}
    }

    if (polyPtr->outline.gc != None) {
	tsoffset = &polyPtr->outline.tsoffset;
	if (tsoffset) {
	    if (tsoffset->flags & TK_OFFSET_INDEX) {
		int index = tsoffset->flags & ~TK_OFFSET_INDEX;

		if (tsoffset->flags == INT_MAX) {
		    index = (polyPtr->numPoints - 1) * 2;
		}
		index %= (polyPtr->numPoints - 1) * 2;
		if (index <0) {
		    index += (polyPtr->numPoints - 1) * 2;
		}
		tsoffset->xoffset = (int) (polyPtr->coordPtr[index] + 0.5);
		tsoffset->yoffset = (int) (polyPtr->coordPtr[index+1] + 0.5);
	    } else {
		if (tsoffset->flags & TK_OFFSET_LEFT) {
		    tsoffset->xoffset = polyPtr->header.x1;
		} else if (tsoffset->flags & TK_OFFSET_CENTER) {
		    tsoffset->xoffset = (polyPtr->header.x1 + polyPtr->header.x2)/2;
		} else if (tsoffset->flags & TK_OFFSET_RIGHT) {
		    tsoffset->xoffset = polyPtr->header.x2;
		}
		if (tsoffset->flags & TK_OFFSET_TOP) {
		    tsoffset->yoffset = polyPtr->header.y1;
		} else if (tsoffset->flags & TK_OFFSET_MIDDLE) {
		    tsoffset->yoffset = (polyPtr->header.y1 + polyPtr->header.y2)/2;
		} else if (tsoffset->flags & TK_OFFSET_BOTTOM) {
		    tsoffset->yoffset = polyPtr->header.y2;
		}
	    }
	}

	i = (int) ((width+1.5)/2.0);
	polyPtr->header.x1 -= i;
	polyPtr->header.x2 += i;
	polyPtr->header.y1 -= i;
	polyPtr->header.y2 += i;

	/*
	 * For mitered lines, make a second pass through all the points.
	 * Compute the locations of the two miter vertex points and add those
	 * into the bounding box.
	 */

	if (polyPtr->joinStyle == JoinMiter) {
	    double miter[4];
	    int j;

	    coordPtr = polyPtr->coordPtr;
	    if (polyPtr->numPoints>3) {
		if (TkGetMiterPoints(coordPtr+2*(polyPtr->numPoints-2),
			coordPtr, coordPtr+2, width,
			miter, miter+2)) {
		    for (j = 0; j < 4; j += 2) {
			TkIncludePoint((Tk_Item *) polyPtr, miter+j);
		    }
		}
	     }
	    for (i = polyPtr->numPoints ; i >= 3; i--, coordPtr += 2) {

		if (TkGetMiterPoints(coordPtr, coordPtr+2, coordPtr+4,
			width, miter, miter+2)) {
		    for (j = 0; j < 4; j += 2) {
			TkIncludePoint((Tk_Item *) polyPtr, miter+j);
		    }
		}
	    }
	}
    }

    /*
     * Add one more pixel of fudge factor just to be safe (e.g. X may round
     * differently than we do).
     */

    polyPtr->header.x1 -= 1;
    polyPtr->header.x2 += 1;
    polyPtr->header.y1 -= 1;
    polyPtr->header.y2 += 1;
}

/*
 *--------------------------------------------------------------
 *
 * TkFillPolygon --
 *
 *	This function is invoked to convert a polygon to screen coordinates
 *	and display it using a particular GC.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	ItemPtr is drawn in drawable using the transformation information in
 *	canvas.
 *
 *--------------------------------------------------------------
 */

void
TkFillPolygon(
    Tk_Canvas canvas,		/* Canvas whose coordinate system is to be
				 * used for drawing. */
    double *coordPtr,		/* Array of coordinates for polygon: x1, y1,
				 * x2, y2, .... */
    int numPoints,		/* Twice this many coordinates are present at
				 * *coordPtr. */
    Display *display,		/* Display on which to draw polygon. */
    Drawable drawable,		/* Pixmap or window in which to draw
				 * polygon. */
    GC gc,			/* Graphics context for drawing. */
    GC outlineGC)		/* If not None, use this to draw an outline
				 * around the polygon after filling it. */
{
    XPoint staticPoints[MAX_STATIC_POINTS];
    XPoint *pointPtr;
    XPoint *pPtr;
    int i;

    /*
     * Build up an array of points in screen coordinates. Use a static array
     * unless the polygon has an enormous number of points; in this case,
     * dynamically allocate an array.
     */

    if (numPoints <= MAX_STATIC_POINTS) {
	pointPtr = staticPoints;
    } else {
	pointPtr = (XPoint *) ckalloc((unsigned) (numPoints * sizeof(XPoint)));
    }

    for (i=0, pPtr=pointPtr ; i<numPoints; i+=1, coordPtr+=2, pPtr++) {
	Tk_CanvasDrawableCoords(canvas, coordPtr[0], coordPtr[1], &pPtr->x,
		&pPtr->y);
    }

    /*
     * Display polygon, then free up polygon storage if it was dynamically
     * allocated.
     */

    if (gc != None && numPoints>3) {
	XFillPolygon(display, drawable, gc, pointPtr, numPoints, Complex,
		CoordModeOrigin);
    }
    if (outlineGC != None) {
	XDrawLines(display, drawable, outlineGC, pointPtr,
	    numPoints, CoordModeOrigin);
    }
    if (pointPtr != staticPoints) {
	ckfree((char *) pointPtr);
    }
}

/*
 *--------------------------------------------------------------
 *
 * DisplayPolygon --
 *
 *	This function is invoked to draw a polygon item in a given drawable.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	ItemPtr is drawn in drawable using the transformation information in
 *	canvas.
 *
 *--------------------------------------------------------------
 */

static void
DisplayPolygon(
    Tk_Canvas canvas,		/* Canvas that contains item. */
    Tk_Item *itemPtr,		/* Item to be displayed. */
    Display *display,		/* Display on which to draw item. */
    Drawable drawable,		/* Pixmap or window in which to draw item. */
    int x, int y, int width, int height)
				/* Describes region of canvas that must be
				 * redisplayed (not used). */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    Tk_State state = itemPtr->state;
    Pixmap stipple = polyPtr->fillStipple;
    double linewidth = polyPtr->outline.width;

    if (((polyPtr->fillGC == None) && (polyPtr->outline.gc == None)) ||
	    (polyPtr->numPoints < 1) ||
	    (polyPtr->numPoints < 3 && polyPtr->outline.gc == None)) {
	return;
    }

    if (state == TK_STATE_NULL) {
	state = ((TkCanvas *)canvas)->canvas_state;
    }
    if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
	if (polyPtr->outline.activeWidth>linewidth) {
	    linewidth = polyPtr->outline.activeWidth;
	}
	if (polyPtr->activeFillStipple != None) {
	    stipple = polyPtr->activeFillStipple;
	}
    } else if (state==TK_STATE_DISABLED) {
	if (polyPtr->outline.disabledWidth>0.0) {
	    linewidth = polyPtr->outline.disabledWidth;
	}
	if (polyPtr->disabledFillStipple != None) {
	    stipple = polyPtr->disabledFillStipple;
	}
    }

    /*
     * If we're stippling then modify the stipple offset in the GC. Be sure to
     * reset the offset when done, since the GC is supposed to be read-only.
     */

    if ((stipple != None) && (polyPtr->fillGC != None)) {
	Tk_TSOffset *tsoffset = &polyPtr->tsoffset;
	int w=0; int h=0;
	int flags = tsoffset->flags;

	if (!(flags & TK_OFFSET_INDEX) && (flags & (TK_OFFSET_CENTER|TK_OFFSET_MIDDLE))) {
	    Tk_SizeOfBitmap(display, stipple, &w, &h);
	    if (flags & TK_OFFSET_CENTER) {
		w /= 2;
	    } else {
		w = 0;
	    }
	    if (flags & TK_OFFSET_MIDDLE) {
		h /= 2;
	    } else {
		h = 0;
	    }
	}
	tsoffset->xoffset -= w;
	tsoffset->yoffset -= h;
	Tk_CanvasSetOffset(canvas, polyPtr->fillGC, tsoffset);
	tsoffset->xoffset += w;
	tsoffset->yoffset += h;
    }
    Tk_ChangeOutlineGC(canvas, itemPtr, &(polyPtr->outline));

    if(polyPtr->numPoints < 3) {
	short x,y;
	int intLineWidth = (int) (linewidth + 0.5);

	if (intLineWidth < 1) {
	    intLineWidth = 1;
	}
	Tk_CanvasDrawableCoords(canvas, polyPtr->coordPtr[0],
		    polyPtr->coordPtr[1], &x,&y);
	XFillArc(display, drawable, polyPtr->outline.gc,
		x - intLineWidth/2, y - intLineWidth/2,
		(unsigned int)intLineWidth+1, (unsigned int)intLineWidth+1,
		0, 64*360);
    } else if (!polyPtr->smooth || polyPtr->numPoints < 4) {
	TkFillPolygon(canvas, polyPtr->coordPtr, polyPtr->numPoints,
		    display, drawable, polyPtr->fillGC, polyPtr->outline.gc);
    } else {
	int numPoints;
	XPoint staticPoints[MAX_STATIC_POINTS];
	XPoint *pointPtr;

	/*
	 * This is a smoothed polygon. Display using a set of generated spline
	 * points rather than the original points.
	 */

	numPoints = polyPtr->smooth->coordProc(canvas, NULL,
		polyPtr->numPoints, polyPtr->splineSteps, NULL, NULL);
	if (numPoints <= MAX_STATIC_POINTS) {
	    pointPtr = staticPoints;
	} else {
	    pointPtr = (XPoint *) ckalloc((unsigned)
		    (numPoints * sizeof(XPoint)));
	}
	numPoints = polyPtr->smooth->coordProc(canvas, polyPtr->coordPtr,
		polyPtr->numPoints, polyPtr->splineSteps, pointPtr, NULL);
	if (polyPtr->fillGC != None) {
	    XFillPolygon(display, drawable, polyPtr->fillGC, pointPtr,
		    numPoints, Complex, CoordModeOrigin);
	}
	if (polyPtr->outline.gc != None) {
	    XDrawLines(display, drawable, polyPtr->outline.gc, pointPtr,
		    numPoints, CoordModeOrigin);
	}
	if (pointPtr != staticPoints) {
	    ckfree((char *) pointPtr);
	}
    }
    Tk_ResetOutlineGC(canvas, itemPtr, &(polyPtr->outline));
    if ((stipple != None) && (polyPtr->fillGC != None)) {
	XSetTSOrigin(display, polyPtr->fillGC, 0, 0);
    }
}

/*
 *--------------------------------------------------------------
 *
 * PolygonInsert --
 *
 *	Insert coords into a polugon item at a given index.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The coords in the given item is modified.
 *
 *--------------------------------------------------------------
 */

static void
PolygonInsert(
    Tk_Canvas canvas,		/* Canvas containing text item. */
    Tk_Item *itemPtr,		/* Line item to be modified. */
    int beforeThis,		/* Index before which new coordinates are to
				 * be inserted. */
    Tcl_Obj *obj)		/* New coordinates to be inserted. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    int length, objc, i;
    Tcl_Obj **objv;
    double *newCoordPtr;
    Tk_State state = itemPtr->state;

    if (state == TK_STATE_NULL) {
	state = ((TkCanvas *)canvas)->canvas_state;
    }

    if (!obj || (Tcl_ListObjGetElements(NULL, obj, &objc, &objv) != TCL_OK)
	    || !objc || objc&1) {
	return;
    }
    length = 2*(polyPtr->numPoints - polyPtr->autoClosed);
    while (beforeThis>length) {
	beforeThis -= length;
    }
    while (beforeThis<0) {
	beforeThis += length;
    }
    newCoordPtr = (double *)
	    ckalloc(sizeof(double) * (unsigned)(length + 2 + objc));
    for (i=0; i<beforeThis; i++) {
	newCoordPtr[i] = polyPtr->coordPtr[i];
    }
    for (i=0; i<objc; i++) {
	if (Tcl_GetDoubleFromObj(NULL, objv[i],
		&newCoordPtr[i+beforeThis]) != TCL_OK){
	    ckfree((char *) newCoordPtr);
	    return;
	}
    }

    for (i=beforeThis; i<length; i++) {
	newCoordPtr[i+objc] = polyPtr->coordPtr[i];
    }
    if (polyPtr->coordPtr) {
	ckfree((char *) polyPtr->coordPtr);
    }
    length += objc;
    polyPtr->coordPtr = newCoordPtr;
    polyPtr->numPoints = (length/2) + polyPtr->autoClosed;

    /*
     * Close the polygon if it isn't already closed, or remove autoclosing if
     * the user's coordinates are now closed.
     */

    if (polyPtr->autoClosed) {
	if ((newCoordPtr[length-2] == newCoordPtr[0])
		&& (newCoordPtr[length-1] == newCoordPtr[1])) {
	    polyPtr->autoClosed = 0;
	    polyPtr->numPoints--;
	}
    } else {
	if ((newCoordPtr[length-2] != newCoordPtr[0])
		|| (newCoordPtr[length-1] != newCoordPtr[1])) {
	    polyPtr->autoClosed = 1;
	    polyPtr->numPoints++;
	}
    }

    newCoordPtr[length] = newCoordPtr[0];
    newCoordPtr[length+1] = newCoordPtr[1];
    if (((length-objc)>3) && (state != TK_STATE_HIDDEN)) {
	/*
	 * This is some optimizing code that will result that only the part of
	 * the polygon that changed (and the objects that are overlapping with
	 * that part) need to be redrawn. A special flag is set that instructs
	 * the general canvas code not to redraw the whole object. If this
	 * flag is not set, the canvas will do the redrawing, otherwise I have
	 * to do it here.
	 */

    	double width;
	int j;
	itemPtr->redraw_flags |= TK_ITEM_DONT_REDRAW;

	/*
	 * The header elements that normally are used for the bounding box,
	 * are now used to calculate the bounding box for only the part that
	 * has to be redrawn. That doesn't matter, because afterwards the
	 * bounding box has to be re-calculated anyway.
	 */

	itemPtr->x1 = itemPtr->x2 = (int) polyPtr->coordPtr[beforeThis];
	itemPtr->y1 = itemPtr->y2 = (int) polyPtr->coordPtr[beforeThis+1];
	beforeThis-=2; objc+=4;
	if (polyPtr->smooth) {
	    beforeThis-=2;
	    objc+=4;
	}

	/*
	 * Be careful; beforeThis could now be negative
	 */

	for (i=beforeThis; i<beforeThis+objc; i+=2) {
	    j = i;
	    if (j<0) {
		j += length;
	    } else if (j>=length) {
		j -= length;
	    }
	    TkIncludePoint(itemPtr, polyPtr->coordPtr+j);
	}
	width = polyPtr->outline.width;
	if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
	    if (polyPtr->outline.activeWidth > width) {
		width = polyPtr->outline.activeWidth;
	    }
	} else if (state==TK_STATE_DISABLED) {
	    if (polyPtr->outline.disabledWidth > 0.0) {
		width = polyPtr->outline.disabledWidth;
	    }
	}
	itemPtr->x1 -= (int) width; itemPtr->y1 -= (int) width;
	itemPtr->x2 += (int) width; itemPtr->y2 += (int) width;
	Tk_CanvasEventuallyRedraw(canvas,
		itemPtr->x1, itemPtr->y1, itemPtr->x2, itemPtr->y2);
    }

    ComputePolygonBbox(canvas, polyPtr);
}

/*
 *--------------------------------------------------------------
 *
 * PolygonDeleteCoords --
 *
 *	Delete one or more coordinates from a polygon item.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Characters between "first" and "last", inclusive, get deleted from
 *	itemPtr.
 *
 *--------------------------------------------------------------
 */

static void
PolygonDeleteCoords(
    Tk_Canvas canvas,		/* Canvas containing itemPtr. */
    Tk_Item *itemPtr,		/* Item in which to delete characters. */
    int first,			/* Index of first character to delete. */
    int last)			/* Index of last character to delete. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    int count, i;
    int length = 2*(polyPtr->numPoints - polyPtr->autoClosed);

    while (first>=length) {
	first -= length;
    }
    while (first<0) {
	first += length;
    }
    while (last>=length) {
	last -= length;
    }
    while (last<0) {
	last += length;
    }

    first &= -2;
    last &= -2;

    count = last + 2 - first;
    if (count<=0) {
	count += length;
    }

    if (count >= length) {
	polyPtr->numPoints = 0;
	if (polyPtr->coordPtr != NULL) {
	    ckfree((char *) polyPtr->coordPtr);
	    polyPtr->coordPtr = NULL;
	}
	ComputePolygonBbox(canvas, polyPtr);
	return;
    }

    if (last>=first) {
	for(i=last+2; i<length; i++) {
	    polyPtr->coordPtr[i-count] = polyPtr->coordPtr[i];
	}
    } else {
	for(i=last; i<=first; i++) {
	    polyPtr->coordPtr[i-last] = polyPtr->coordPtr[i];
	}
    }
    polyPtr->coordPtr[length-count] = polyPtr->coordPtr[0];
    polyPtr->coordPtr[length-count+1] = polyPtr->coordPtr[1];
    polyPtr->numPoints -= count/2;
    ComputePolygonBbox(canvas, polyPtr);
}

/*
 *--------------------------------------------------------------
 *
 * PolygonToPoint --
 *
 *	Computes the distance from a given point to a given polygon, in canvas
 *	units.
 *
 * Results:
 *	The return value is 0 if the point whose x and y coordinates are
 *	pointPtr[0] and pointPtr[1] is inside the polygon. If the point isn't
 *	inside the polygon then the return value is the distance from the
 *	point to the polygon.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

	/* ARGSUSED */
static double
PolygonToPoint(
    Tk_Canvas canvas,		/* Canvas containing item. */
    Tk_Item *itemPtr,		/* Item to check against point. */
    double *pointPtr)		/* Pointer to x and y coordinates. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    double *coordPtr, *polyPoints;
    double staticSpace[2*MAX_STATIC_POINTS];
    double poly[10];
    double radius;
    double bestDist, dist;
    int numPoints, count;
    int changedMiterToBevel;	/* Non-zero means that a mitered corner had to
				 * be treated as beveled after all because the
				 * angle was < 11 degrees. */
    double width;
    Tk_State state = itemPtr->state;

    bestDist = 1.0e36;

    if (state == TK_STATE_NULL) {
	state = ((TkCanvas *)canvas)->canvas_state;
    }
    width = polyPtr->outline.width;
    if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
	if (polyPtr->outline.activeWidth>width) {
	    width = polyPtr->outline.activeWidth;
	}
    } else if (state==TK_STATE_DISABLED) {
	if (polyPtr->outline.disabledWidth>0.0) {
	    width = polyPtr->outline.disabledWidth;
	}
    }
    radius = width/2.0;

    /*
     * Handle smoothed polygons by generating an expanded set of points
     * against which to do the check.
     */

    if ((polyPtr->smooth) && (polyPtr->numPoints>2)) {
	numPoints = polyPtr->smooth->coordProc(canvas, NULL,
		polyPtr->numPoints, polyPtr->splineSteps, NULL,
		NULL);
	if (numPoints <= MAX_STATIC_POINTS) {
	    polyPoints = staticSpace;
	} else {
	    polyPoints = (double *) ckalloc((unsigned)
		    (2*numPoints*sizeof(double)));
	}
	numPoints = polyPtr->smooth->coordProc(canvas, polyPtr->coordPtr,
		polyPtr->numPoints, polyPtr->splineSteps, NULL,
		polyPoints);
    } else {
	numPoints = polyPtr->numPoints;
	polyPoints = polyPtr->coordPtr;
    }

    bestDist = TkPolygonToPoint(polyPoints, numPoints, pointPtr);
    if (bestDist<=0.0) {
	goto donepoint;
    }
    if ((polyPtr->outline.gc != None) && (polyPtr->joinStyle == JoinRound)) {
	dist = bestDist - radius;
	if (dist <= 0.0) {
	    bestDist = 0.0;
	    goto donepoint;
	} else {
	    bestDist = dist;
	}
    }

    if ((polyPtr->outline.gc == None) || (width <= 1)) {
	goto donepoint;
    }

    /*
     * The overall idea is to iterate through all of the edges of the line,
     * computing a polygon for each edge and testing the point against that
     * polygon. In addition, there are additional tests to deal with rounded
     * joints and caps.
     */

    changedMiterToBevel = 0;
    for (count = numPoints, coordPtr = polyPoints; count >= 2;
	    count--, coordPtr += 2) {
	/*
	 * If rounding is done around the first point then compute the
	 * distance between the point and the point.
	 */

	if (polyPtr->joinStyle == JoinRound) {
	    dist = hypot(coordPtr[0] - pointPtr[0], coordPtr[1] - pointPtr[1])
		    - radius;
	    if (dist <= 0.0) {
		bestDist = 0.0;
		goto donepoint;
	    } else if (dist < bestDist) {
		bestDist = dist;
	    }
	}

	/*
	 * Compute the polygonal shape corresponding to this edge, consisting
	 * of two points for the first point of the edge and two points for
	 * the last point of the edge.
	 */

	if (count == numPoints) {
	    TkGetButtPoints(coordPtr+2, coordPtr, (double) width,
		    0, poly, poly+2);
	} else if ((polyPtr->joinStyle == JoinMiter) && !changedMiterToBevel) {
	    poly[0] = poly[6];
	    poly[1] = poly[7];
	    poly[2] = poly[4];
	    poly[3] = poly[5];
	} else {
	    TkGetButtPoints(coordPtr+2, coordPtr, (double) width, 0,
		    poly, poly+2);

	    /*
	     * If this line uses beveled joints, then check the distance to a
	     * polygon comprising the last two points of the previous polygon
	     * and the first two from this polygon; this checks the wedges
	     * that fill the mitered joint.
	     */

	    if ((polyPtr->joinStyle == JoinBevel) || changedMiterToBevel) {
		poly[8] = poly[0];
		poly[9] = poly[1];
		dist = TkPolygonToPoint(poly, 5, pointPtr);
		if (dist <= 0.0) {
		    bestDist = 0.0;
		    goto donepoint;
		} else if (dist < bestDist) {
		    bestDist = dist;
		}
		changedMiterToBevel = 0;
	    }
	}
	if (count == 2) {
	    TkGetButtPoints(coordPtr, coordPtr+2, (double) width,
		    0, poly+4, poly+6);
	} else if (polyPtr->joinStyle == JoinMiter) {
	    if (TkGetMiterPoints(coordPtr, coordPtr+2, coordPtr+4,
		    (double) width, poly+4, poly+6) == 0) {
		changedMiterToBevel = 1;
		TkGetButtPoints(coordPtr, coordPtr+2, (double) width, 0,
			poly+4, poly+6);
	    }
	} else {
	    TkGetButtPoints(coordPtr, coordPtr+2, (double) width, 0,
		    poly+4, poly+6);
	}
	poly[8] = poly[0];
	poly[9] = poly[1];
	dist = TkPolygonToPoint(poly, 5, pointPtr);
	if (dist <= 0.0) {
	    bestDist = 0.0;
	    goto donepoint;
	} else if (dist < bestDist) {
	    bestDist = dist;
	}
    }

  donepoint:
    if ((polyPoints != staticSpace) && polyPoints != polyPtr->coordPtr) {
	ckfree((char *) polyPoints);
    }
    return bestDist;
}

/*
 *--------------------------------------------------------------
 *
 * PolygonToArea --
 *
 *	This function is called to determine whether an item lies entirely
 *	inside, entirely outside, or overlapping a given rectangular area.
 *
 * Results:
 *	-1 is returned if the item is entirely outside the area given by
 *	rectPtr, 0 if it overlaps, and 1 if it is entirely inside the given
 *	area.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

	/* ARGSUSED */
static int
PolygonToArea(
    Tk_Canvas canvas,		/* Canvas containing item. */
    Tk_Item *itemPtr,		/* Item to check against polygon. */
    double *rectPtr)		/* Pointer to array of four coordinates
				 * (x1,y1,x2,y2) describing rectangular
				 * area. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    double *coordPtr;
    double staticSpace[2*MAX_STATIC_POINTS];
    double *polyPoints, poly[10];
    double radius;
    int numPoints, count;
    int changedMiterToBevel;	/* Non-zero means that a mitered corner had to
				 * be treated as beveled after all because the
				 * angle was < 11 degrees. */
    int inside;			/* Tentative guess about what to return, based
				 * on all points seen so far: one means
				 * everything seen so far was inside the area;
				 * -1 means everything was outside the area. 0
				 * means overlap has been found. */
    double width;
    Tk_State state = itemPtr->state;

    if (state == TK_STATE_NULL) {
	state = ((TkCanvas *)canvas)->canvas_state;
    }

    width = polyPtr->outline.width;
    if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
	if (polyPtr->outline.activeWidth>width) {
	    width = polyPtr->outline.activeWidth;
	}
    } else if (state==TK_STATE_DISABLED) {
	if (polyPtr->outline.disabledWidth>0.0) {
	    width = polyPtr->outline.disabledWidth;
	}
    }

    radius = width/2.0;
    inside = -1;

    if ((state==TK_STATE_HIDDEN) || polyPtr->numPoints<2) {
	return -1;
    } else if (polyPtr->numPoints <3) {
	double oval[4];

	oval[0] = polyPtr->coordPtr[0]-radius;
	oval[1] = polyPtr->coordPtr[1]-radius;
	oval[2] = polyPtr->coordPtr[0]+radius;
	oval[3] = polyPtr->coordPtr[1]+radius;
	return TkOvalToArea(oval, rectPtr);
    }

    /*
     * Handle smoothed polygons by generating an expanded set of points
     * against which to do the check.
     */

    if (polyPtr->smooth) {
	numPoints = polyPtr->smooth->coordProc(canvas, NULL,
		polyPtr->numPoints, polyPtr->splineSteps, NULL, NULL);
	if (numPoints <= MAX_STATIC_POINTS) {
	    polyPoints = staticSpace;
	} else {
	    polyPoints = (double *)
		    ckalloc((unsigned) (2*numPoints*sizeof(double)));
	}
	numPoints = polyPtr->smooth->coordProc(canvas, polyPtr->coordPtr,
		polyPtr->numPoints, polyPtr->splineSteps, NULL, polyPoints);
    } else {
	numPoints = polyPtr->numPoints;
	polyPoints = polyPtr->coordPtr;
    }

    /*
     * Simple test to see if we are in the polygon. Polygons are different
     * from othe canvas items in that they register points being inside even
     * if it isn't filled.
     */

    inside = TkPolygonToArea(polyPoints, numPoints, rectPtr);
    if (inside==0) {
	goto donearea;
    }

    if (polyPtr->outline.gc == None) {
	goto donearea;
    }

    /*
     * Iterate through all of the edges of the line, computing a polygon for
     * each edge and testing the area against that polygon. In addition, there
     * are additional tests to deal with rounded joints and caps.
     */

    changedMiterToBevel = 0;
    for (count = numPoints, coordPtr = polyPoints; count >= 2;
	    count--, coordPtr += 2) {
	/*
	 * If rounding is done around the first point of the edge then test a
	 * circular region around the point with the area.
	 */

	if (polyPtr->joinStyle == JoinRound) {
	    poly[0] = coordPtr[0] - radius;
	    poly[1] = coordPtr[1] - radius;
	    poly[2] = coordPtr[0] + radius;
	    poly[3] = coordPtr[1] + radius;
	    if (TkOvalToArea(poly, rectPtr) != inside) {
		inside = 0;
		goto donearea;
	    }
	}

	/*
	 * Compute the polygonal shape corresponding to this edge, consisting
	 * of two points for the first point of the edge and two points for
	 * the last point of the edge.
	 */

	if (count == numPoints) {
	    TkGetButtPoints(coordPtr+2, coordPtr, width, 0, poly, poly+2);
	} else if ((polyPtr->joinStyle == JoinMiter) && !changedMiterToBevel) {
	    poly[0] = poly[6];
	    poly[1] = poly[7];
	    poly[2] = poly[4];
	    poly[3] = poly[5];
	} else {
	    TkGetButtPoints(coordPtr+2, coordPtr, width, 0, poly, poly+2);

	    /*
	     * If the last joint was beveled, then also check a polygon
	     * comprising the last two points of the previous polygon and the
	     * first two from this polygon; this checks the wedges that fill
	     * the beveled joint.
	     */

	    if ((polyPtr->joinStyle == JoinBevel) || changedMiterToBevel) {
		poly[8] = poly[0];
		poly[9] = poly[1];
		if (TkPolygonToArea(poly, 5, rectPtr) != inside) {
		    inside = 0;
		    goto donearea;
		}
		changedMiterToBevel = 0;
	    }
	}
	if (count == 2) {
	    TkGetButtPoints(coordPtr, coordPtr+2, width, 0, poly+4, poly+6);
	} else if (polyPtr->joinStyle == JoinMiter) {
	    if (TkGetMiterPoints(coordPtr, coordPtr+2, coordPtr+4,
		    width, poly+4, poly+6) == 0) {
		changedMiterToBevel = 1;
		TkGetButtPoints(coordPtr, coordPtr+2, width,0, poly+4, poly+6);
	    }
	} else {
	    TkGetButtPoints(coordPtr, coordPtr+2, width, 0, poly+4, poly+6);
	}
	poly[8] = poly[0];
	poly[9] = poly[1];
	if (TkPolygonToArea(poly, 5, rectPtr) != inside) {
	    inside = 0;
	    goto donearea;
	}
    }

  donearea:
    if ((polyPoints != staticSpace) && (polyPoints != polyPtr->coordPtr)) {
	ckfree((char *) polyPoints);
    }
    return inside;
}

/*
 *--------------------------------------------------------------
 *
 * ScalePolygon --
 *
 *	This function is invoked to rescale a polygon item.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The polygon referred to by itemPtr is rescaled so that the following
 *	transformation is applied to all point coordinates:
 *		x' = originX + scaleX*(x-originX)
 *		y' = originY + scaleY*(y-originY)
 *
 *--------------------------------------------------------------
 */

static void
ScalePolygon(
    Tk_Canvas canvas,		/* Canvas containing polygon. */
    Tk_Item *itemPtr,		/* Polygon to be scaled. */
    double originX, double originY,
				/* Origin about which to scale rect. */
    double scaleX,		/* Amount to scale in X direction. */
    double scaleY)		/* Amount to scale in Y direction. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    double *coordPtr;
    int i;

    for (i = 0, coordPtr = polyPtr->coordPtr; i < polyPtr->numPoints;
	    i++, coordPtr += 2) {
	*coordPtr = originX + scaleX*(*coordPtr - originX);
	coordPtr[1] = originY + scaleY*(coordPtr[1] - originY);
    }
    ComputePolygonBbox(canvas, polyPtr);
}

/*
 *--------------------------------------------------------------
 *
 * GetPolygonIndex --
 *
 *	Parse an index into a polygon item and return either its value or an
 *	error.
 *
 * Results:
 *	A standard Tcl result. If all went well, then *indexPtr is filled in
 *	with the index (into itemPtr) corresponding to string. Otherwise an
 *	error message is left in interp->result.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

static int
GetPolygonIndex(
    Tcl_Interp *interp,		/* Used for error reporting. */
    Tk_Canvas canvas,		/* Canvas containing item. */
    Tk_Item *itemPtr,		/* Item for which the index is being
				 * specified. */
    Tcl_Obj *obj,		/* Specification of a particular coord in
				 * itemPtr's line. */
    int *indexPtr)		/* Where to store converted index. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    int length;
    char *string = Tcl_GetStringFromObj(obj, &length);

    if (string[0] == 'e') {
	if (strncmp(string, "end", (unsigned)length) == 0) {
	    *indexPtr = 2*(polyPtr->numPoints - polyPtr->autoClosed);
	} else {
	    /*
	     * Some of the paths here leave messages in interp->result, so we
	     * have to clear it out before storing our own message.
	     */

	badIndex:
	    Tcl_SetResult(interp, NULL, TCL_STATIC);
	    Tcl_AppendResult(interp, "bad index \"", string, "\"", NULL);
	    return TCL_ERROR;
	}
    } else if (string[0] == '@') {
	int i;
	double x ,y, bestDist, dist, *coordPtr;
	char *end, *p;

	p = string+1;
	x = strtod(p, &end);
	if ((end == p) || (*end != ',')) {
	    goto badIndex;
	}
	p = end+1;
	y = strtod(p, &end);
	if ((end == p) || (*end != 0)) {
	    goto badIndex;
	}
	bestDist = 1.0e36;
	coordPtr = polyPtr->coordPtr;
	*indexPtr = 0;
	for(i=0; i<(polyPtr->numPoints-1); i++) {
	    dist = hypot(coordPtr[0] - x, coordPtr[1] - y);
	    if (dist<bestDist) {
		bestDist = dist;
		*indexPtr = 2*i;
	    }
	    coordPtr += 2;
	}
    } else {
	int count = 2*(polyPtr->numPoints - polyPtr->autoClosed);

	if (Tcl_GetIntFromObj(interp, obj, indexPtr) != TCL_OK) {
	    goto badIndex;
	}
	*indexPtr &= -2; /* if odd, make it even */
	if (count) {
	    if (*indexPtr > 0) {
		*indexPtr = ((*indexPtr - 2) % count) + 2;
	    } else {
		*indexPtr = -((-(*indexPtr)) % count);
	    }
	} else {
	    *indexPtr = 0;
	}
    }
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * TranslatePolygon --
 *
 *	This function is called to move a polygon by a given amount.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The position of the polygon is offset by (xDelta, yDelta), and the
 *	bounding box is updated in the generic part of the item structure.
 *
 *--------------------------------------------------------------
 */

static void
TranslatePolygon(
    Tk_Canvas canvas,		/* Canvas containing item. */
    Tk_Item *itemPtr,		/* Item that is being moved. */
    double deltaX, double deltaY)
				/* Amount by which item is to be moved. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    double *coordPtr;
    int i;

    for (i = 0, coordPtr = polyPtr->coordPtr; i < polyPtr->numPoints;
	    i++, coordPtr += 2) {
	*coordPtr += deltaX;
	coordPtr[1] += deltaY;
    }
    ComputePolygonBbox(canvas, polyPtr);
}

/*
 *--------------------------------------------------------------
 *
 * PolygonToPostscript --
 *
 *	This function is called to generate Postscript for polygon items.
 *
 * Results:
 *	The return value is a standard Tcl result. If an error occurs in
 *	generating Postscript then an error message is left in the interp's
 *	result, replacing whatever used to be there. If no error occurs, then
 *	Postscript for the item is appended to the result.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

static int
PolygonToPostscript(
    Tcl_Interp *interp,		/* Leave Postscript or error message here. */
    Tk_Canvas canvas,		/* Information about overall canvas. */
    Tk_Item *itemPtr,		/* Item for which Postscript is wanted. */
    int prepass)		/* 1 means this is a prepass to collect font
				 * information; 0 means final Postscript is
				 * being created. */
{
    PolygonItem *polyPtr = (PolygonItem *) itemPtr;
    char *style;
    XColor *color;
    XColor *fillColor;
    Pixmap stipple;
    Pixmap fillStipple;
    Tk_State state = itemPtr->state;
    double width;

    if (polyPtr->numPoints<2 || polyPtr->coordPtr==NULL) {
	return TCL_OK;
    }

    if(state == TK_STATE_NULL) {
	state = ((TkCanvas *)canvas)->canvas_state;
    }
    width = polyPtr->outline.width;
    color = polyPtr->outline.color;
    stipple = polyPtr->fillStipple;
    fillColor = polyPtr->fillColor;
    fillStipple = polyPtr->fillStipple;
    if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
	if (polyPtr->outline.activeWidth>width) {
	    width = polyPtr->outline.activeWidth;
	}
	if (polyPtr->outline.activeColor!=NULL) {
	    color = polyPtr->outline.activeColor;
	}
	if (polyPtr->outline.activeStipple!=None) {
	    stipple = polyPtr->outline.activeStipple;
	}
	if (polyPtr->activeFillColor!=NULL) {
	    fillColor = polyPtr->activeFillColor;
	}
	if (polyPtr->activeFillStipple!=None) {
	    fillStipple = polyPtr->activeFillStipple;
	}
    } else if (state==TK_STATE_DISABLED) {
	if (polyPtr->outline.disabledWidth>0.0) {
	    width = polyPtr->outline.disabledWidth;
	}
	if (polyPtr->outline.disabledColor!=NULL) {
	    color = polyPtr->outline.disabledColor;
	}
	if (polyPtr->outline.disabledStipple!=None) {
	    stipple = polyPtr->outline.disabledStipple;
	}
	if (polyPtr->disabledFillColor!=NULL) {
	    fillColor = polyPtr->disabledFillColor;
	}
	if (polyPtr->disabledFillStipple!=None) {
	    fillStipple = polyPtr->disabledFillStipple;
	}
    }
    if (polyPtr->numPoints==2) {
	char string[128];
	if (color == NULL) {
	    return TCL_OK;
	}

	sprintf(string, "%.15g %.15g translate %.15g %.15g",
		polyPtr->coordPtr[0], Tk_CanvasPsY(canvas, polyPtr->coordPtr[1]),
		width/2.0, width/2.0);
	Tcl_AppendResult(interp, "matrix currentmatrix\n",string,
		" scale 1 0 moveto 0 0 1 0 360 arc\nsetmatrix\n", NULL);
	if (Tk_CanvasPsColor(interp, canvas, color) != TCL_OK) {
	    return TCL_ERROR;
	}
	if (stipple != None) {
	    Tcl_AppendResult(interp, "clip ", NULL);
	    if (Tk_CanvasPsStipple(interp, canvas, stipple) != TCL_OK) {
		return TCL_ERROR;
	    }
	} else {
	    Tcl_AppendResult(interp, "fill\n", NULL);
	}
	return TCL_OK;
    }

    /*
     * Fill the area of the polygon.
     */

    if (fillColor != NULL && polyPtr->numPoints>3) {
	if (!polyPtr->smooth || !polyPtr->smooth->postscriptProc) {
	    Tk_CanvasPsPath(interp, canvas, polyPtr->coordPtr,
		    polyPtr->numPoints);
	} else {
	    polyPtr->smooth->postscriptProc(interp, canvas, polyPtr->coordPtr,
		    polyPtr->numPoints, polyPtr->splineSteps);
	}
	if (Tk_CanvasPsColor(interp, canvas, fillColor) != TCL_OK) {
	    return TCL_ERROR;
	}
	if (fillStipple != None) {
	    Tcl_AppendResult(interp, "eoclip ", NULL);
	    if (Tk_CanvasPsStipple(interp, canvas, fillStipple) != TCL_OK) {
		return TCL_ERROR;
	    }
	    if (color != NULL) {
		Tcl_AppendResult(interp, "grestore gsave\n", NULL);
	    }
	} else {
	    Tcl_AppendResult(interp, "eofill\n", NULL);
	}
    }

    /*
     * Now draw the outline, if there is one.
     */

    if (color != NULL) {
	if (!polyPtr->smooth || !polyPtr->smooth->postscriptProc) {
	    Tk_CanvasPsPath(interp, canvas, polyPtr->coordPtr,
		    polyPtr->numPoints);
	} else {
	    polyPtr->smooth->postscriptProc(interp, canvas, polyPtr->coordPtr,
		    polyPtr->numPoints, polyPtr->splineSteps);
	}

	if (polyPtr->joinStyle == JoinRound) {
	    style = "1";
	} else if (polyPtr->joinStyle == JoinBevel) {
	    style = "2";
	} else {
	    style = "0";
	}
	Tcl_AppendResult(interp, style," setlinejoin 1 setlinecap\n", NULL);
	if (Tk_CanvasPsOutline(canvas, itemPtr,
		&(polyPtr->outline)) != TCL_OK) {
	    return TCL_ERROR;
	}
    }
    return TCL_OK;
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */