Threejs OrbitControl源码解析

?

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 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044

import {Vector3} from 'three'; import {Vector2} from 'three'; import {MOUSE} from 'three'; import {Quaternion} from 'three'; import {Spherical} from 'three'; import {PerspectiveCamera} from 'three'; import {OrthographicCamera} from 'three'; import {EventDispatcher} from 'three';   import {FOV} from './CameraUtils'; import {zoomRange} from '../utils/zoomUtils';   /**  * 实现手势控制：  * 移动端：  * 单指移动->平移  * 双指转动->绕y轴旋转  * 双指pinch->缩放  * 双指上下滑动->绕x轴旋转(2/3D切换)  * pc端：  * 鼠标左键移动->平移  * 鼠标滚轮->缩放  * 鼠标右键移动->旋转  * @type {[type]}  */ const DEG2RAD = Math.PI / 180; const INTOUCHDEVICE = 'ontouchstart' in document; // const zoomRange = [2.3886571, 1.1943286, 0.5971643, 0.2985821, 0.1492911, 0.0746455, 0.0373227];   export let OrbitControls = function ( object, domElement ) {     this.object = object; // Object代表camera     this.domElement = ( domElement !== undefined ) ? domElement : document;     // Set to false to disable this control   this.enabled = true;     // "target" sets the location of focus, where the object orbits around   this.target = new Vector3();     // How far you can dolly in and out ( PerspectiveCamera only )   // 我理解是相机距离target的距离   this.minDistance = 0;   this.maxDistance = Infinity;     // How far you can zoom in and out ( OrthographicCamera only )   this.minZoom = 0;   this.maxZoom = Infinity;     // How far you can orbit vertically, upper and lower limits.   // Range is 0 to Math.PI radians.   // 我理解是在一个包围y轴的平面内能旋转的角度（与y轴平行线的夹角）；   // 可以理解为绕垂直y轴和相机的target->position向量形成的平面的向量来转动（四元数）   this.minPolarAngle = 0; // radians   this.maxPolarAngle = Math.PI; // radians     // How far you can orbit horizontally, upper and lower limits.   // If set, must be a sub-interval of the interval [ - Math.PI, Math.PI ].   // 在一个包围x轴的平面内能够旋转的角度（与x轴平行线的夹角）；可以理解为绕y轴的旋转   this.minAzimuthAngle = - Infinity; // radians   this.maxAzimuthAngle = Infinity; // radians     // Set to true to enable damping (inertia)   // If damping is enabled, you must call controls.update() in your animation loop   this.enableDamping = false;// 阻尼   this.dampingFactor = 0.25;     // This option actually enables dollying in and out; left as "zoom" for backwards compatibility.   // Set to false to disable zooming   this.enableZoom = true;// 缩放控制（透视相机下dolly距离或正射投影下的zoom）   this.zoomSpeed = 1.0;   // 这个zoomScale是指的地图数据的级别   this.zoomScale = zoomRange[zoomRange.length - 1];// 设置zoom级别1-6     // Set to false to disable rotating   this.enableRotate = true;   this.rotateSpeed = 1.0;     // Set to false to disable panning   this.enablePan = true;   this.keyPanSpeed = 7.0; // pixels moved per arrow key push     // Set to true to automatically rotate around the target   // If auto-rotate is enabled, you must call controls.update() in your animation loop   this.autoRotate = false;   this.autoRotateSpeed = 2.0; // 30 seconds per round when fps is 60     // Set to false to disable use of the keys   this.enableKeys = true;     // The four arrow keys   this.keys = { LEFT: 37, UP: 38, RIGHT: 39, BOTTOM: 40 };     // Mouse buttons   this.mouseButtons = { ORBIT: MOUSE.RIGHT, ZOOM: MOUSE.MIDDLE, PAN: MOUSE.LEFT };     // for reset   this.target0 = this.target.clone();   this.position0 = this.object.position.clone();   this.zoom0 = this.object.zoom;     //   // public methods   //     this.getPolarAngle = function () {       return spherical.phi;     };     this.getAzimuthalAngle = function () {       return spherical.theta;     };   // 保存当前control的target、position和相机的zoom   this.saveState = function () {       scope.target0.copy( scope.target );     scope.position0.copy( scope.object.position );     scope.zoom0 = scope.object.zoom;     };     // 恢复上次状态   this.reset = function () {       scope.target.copy( scope.target0 );     scope.object.position.copy( scope.position0 );     scope.object.zoom = scope.zoom0;       scope.object.updateProjectionMatrix();     scope.dispatchEvent( changeEvent );       scope.update();       state = STATE.NONE;     };     // this method is exposed, but perhaps it would be better if we can make it private...   this.update = function () {       var offset = new Vector3();       // so camera.up is the orbit axis     // 根据相机的up轴指向和y轴来求出一个表示绕垂直这两向量形成的平面的向量的转动夹角     // 这个四元数表示初始时相机up与y轴的夹角     var quat = new Quaternion().setFromUnitVectors( object.up, new Vector3( 0, 1, 0 ) );     var quatInverse = quat.clone().inverse();// 求共轭四元数       var lastPosition = new Vector3();     var lastQuaternion = new Quaternion();       /**      * [update description]      * @param  {[type]} updateZoomScale [zoomScale相同时仍然触发zoom事件]      * @param  {[type]} noUpdateZoom    [是否触发zoom事件]      * @return {[type]}                 [description]      */     return function update(updateZoomScale, noUpdateZoom) {         var position = scope.object.position; // 这个时候position跟target应该都还未变化         offset.copy( position ).sub( scope.target );// 形成一个从target->position的向量         // rotate offset to "y-axis-is-up" space       // 相机可以做各种旋转up也会有各种变化，但我们希望将y轴作为相机的up轴，这样方便计算       offset.applyQuaternion( quat );// 用一个四元素来旋转向量, v‘ = qvq-1         // angle from z-axis around y-axis       spherical.setFromVector3( offset );// 将相机位置转化成球面坐标         if ( scope.autoRotate && state === STATE.NONE ) {           rotateLeft( getAutoRotationAngle() );         }         // 在我看来每次手势事件转动物体实际都是相当于在转动一个球，       // 以屏幕中心为原点转动轴就是世界坐标系的三个轴，       // 而我们观察到的物体就是将相机帮到球上转动后的结果，       // 所以我们先把相机的up轴设置为与y轴重合，       // 这样相机就相当于在一个标准单位球下来转动、缩放       // 最后再将相机放回原先的up轴所在空间       // 这样的好处就是通过改变相机来改变视域中的所有物体，而不是要改变物体的模型矩阵       spherical.theta += sphericalDelta.theta;       // console.log('theta: ' + spherical.theta * 180 / Math.PI, 'phi: ' + spherical.phi * 180 / Math.PI);       // restrict theta to be between desired limits       spherical.theta = Math.max( scope.minAzimuthAngle, Math.min( scope.maxAzimuthAngle, spherical.theta ) );         // if (scope.object instanceof PerspectiveCamera) {         // console.log('spherical.phi:  ', spherical.phi, 'sphericalDelta.phi:   ', sphericalDelta.phi);         spherical.phi += sphericalDelta.phi;         // restrict phi to be between desired limits         spherical.phi = Math.max( scope.minPolarAngle, Math.min( scope.maxPolarAngle, spherical.phi ) );       // }         spherical.makeSafe();           spherical.radius *= scale; // 缩放，dollyIn或dollyOut       // console.log('scale: ' + scale);       // restrict radius to be between desired limits       spherical.radius = Math.max( scope.minDistance, Math.min( scope.maxDistance, spherical.radius ) );       // console.log('spherical.radius: ' + spherical.radius, scope.minDistance, scope.maxDistance);       // move target to panned location       scope.target.add( panOffset ); // 利用向量加法将观察点向平移方向移动       // console.log('target: ', scope.target);       offset.setFromSpherical( spherical ); // 利用y轴为up轴的球面坐标坐标系来设置target-position向量         // rotate offset back to "camera-up-vector-is-up" space       offset.applyQuaternion( quatInverse ); // 然后将相机的target-position旋转到以相机真正up轴为相机正上方的空间中       // 利用向量加法将新观察点的向量与target-position相加，得到相机新的位置       // 这样就通过移动相机来实现移动物体；而不是要修改每个物体的模型矩阵       position.copy( scope.target ).add( offset );         scope.object.lookAt( scope.target );         // if (sphericalDelta.theta !== 0 || sphericalDelta.phi !== 0) {         scope.dispatchEvent({           type: 'rotation-change',           sphericalDelta: sphericalDelta,           spherical: spherical         });       // }       if ( scope.enableDamping === true ) {           sphericalDelta.theta *= ( 1 - scope.dampingFactor );         sphericalDelta.phi *= ( 1 - scope.dampingFactor );         } else {           sphericalDelta.set( 0, 0, 0 );         }         if (!noUpdateZoom) {         if (scale !== 1 || updateZoomScale) {           var zoomLevel = getZoomRange(spherical.radius);           if (scope.zoomScale !== zoomLevel || updateZoomScale) {             scope.dispatchEvent({               type: 'zoom-change',               zoom: zoomLevel             });             scope.zoomScale = zoomLevel;           }             scope.dispatchEvent({             type: 'scale-change',             scale: scale           });             // console.log('zoomLevel: ' + zoomLevel);         }       }           // 重置变量       scale = 1;       panOffset.set( 0, 0, 0 );       // update condition is:       // min(camera displacement, camera rotation in radians)^2 > EPS       // using small-angle approximation cos(x/2) = 1 - x^2 / 8       // 满足更新条件时才会记录       var ds = lastPosition.distanceToSquared( scope.object.position );       if ( zoomChanged ||         ds > EPS ||         8 * ( 1 - lastQuaternion.dot( scope.object.quaternion ) ) > EPS ) {           scope.dispatchEvent( changeEvent );           lastPosition.copy( scope.object.position );         lastQuaternion.copy( scope.object.quaternion );         zoomChanged = false;           return true;         }       return false;       };     }();     // this.getPixelMeterRatio = function(target) {   //   target = target ? target : scope.target;   //   var element = scope.domElement === document ?   //     scope.domElement.body : scope.domElement;   //   var distance = scope.object.position.distanceTo(target);   //   var h = scope.object instanceof PerspectiveCamera ?   //     (Math.tan(scope.object.fov / 2 * DEG2RAD) * distance) * 2 :   //     (scope.object.top - scope.object.bottom) / scope.object.zoom;   //   var meterPerPixel = h / element.clientHeight;     //   return meterPerPixel;   // }     this.goTop = function() {     sphericalDelta.phi = -spherical.phi;   }     this.getScaleByDistance = function(distance) {     return distance / spherical.radius;   }     this.getScaleByZoom = function(zoom) {     if (scope.object instanceof OrthographicCamera) {       return 1;     }     var element = scope.domElement === document ?       scope.domElement.body : scope.domElement;     var ratio = zoomRange[zoom - 1];     var h = ratio * element.clientHeight;     var distance = h / 2 / Math.tan(scope.object.fov / 2 * DEG2RAD);     var eyeDis = scope.object.position.distanceTo(scope.target);       return distance / eyeDis;   }     this.setScale = function(s, noUpdateZoom, updateZoomScale) {     scale = s;     scope.update(updateZoomScale, noUpdateZoom);   }     this.unprojectPan = function(deltaVector, moveDown, target) {     // var getProjectLength()     var element = scope.domElement === document ? scope.domElement.body : scope.domElement;       var cxv = new Vector3(0, 0, 0).setFromMatrixColumn(scope.object.matrix, 0);// 相机x轴     var cyv = new Vector3(0, 0, 0).setFromMatrixColumn(scope.object.matrix, 1);// 相机y轴     // 相机轴都是单位向量     var pxl = deltaVector.dot(cxv)/* / cxv.length()*/; // 向量在相机x轴的投影     var pyl = deltaVector.dot(cyv)/* / cyv.length()*/; // 向量在相机y轴的投影       // offset=dx * vector(cx) + dy * vector(cy.project(xoz).normalize)     // offset由相机x轴方向向量+相机y轴向量在xoz平面的投影组成     var dv = deltaVector.clone();     dv.y = 0; // 目前算法不会改变相机target的y分量     dv.sub(cxv.multiplyScalar(pxl));     pyl = dv.length();       if ( scope.object instanceof PerspectiveCamera ) {       // perspective         var position = scope.object.position;       var offset = new Vector3(0, 0, 0);       offset.copy(position).sub(target || scope.target);       var distance = offset.length();       distance *= Math.tan(scope.object.fov / 2 * Math.PI / 180);       // console.log('unprojectPan distance: ',distance);         // var xd = 2 * distance * deltaX / element.clientHeight;       // var yd = 2 * distance * deltaY / element.clientHeight;       // panLeft( xd, scope.object.matrix );       // panUp( yd, scope.object.matrix );         var deltaX = pxl * element.clientHeight / (2 * distance);       var deltaY = pyl * element.clientHeight / (2 * distance) * (moveDown ? -1 : 1);         return [deltaX, deltaY];     } else if ( scope.object instanceof OrthographicCamera ) {         // orthographic       // panLeft( deltaX * ( scope.object.right - scope.object.left ) / scope.object.zoom / element.clientWidth, scope.object.matrix );       // panUp( deltaY * ( scope.object.top - scope.object.bottom ) / scope.object.zoom / element.clientHeight, scope.object.matrix );       var deltaX = pxl * element.clientWidth * scope.object.zoom / (scope.object.right - scope.object.left);       var deltaY = pyl * element.clientHeight * scope.object.zoom / (scope.object.top - scope.object.bottom) * (moveDown ? -1 : 1);         return [deltaX, deltaY];     } else {         // camera neither orthographic nor perspective       console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - pan disabled.' );       }   }       this.projectPan = function(deltaX, deltaY) {     var element = scope.domElement === document ? scope.domElement.body : scope.domElement;     var deltaVector = new Vector3(0, 0, 0);     if ( scope.object instanceof PerspectiveCamera ) {         var position = scope.object.position;       var offset = new Vector3(0, 0, 0);       offset.copy(position).sub(scope.target);       var distance = offset.length();       distance *= Math.tan(scope.object.fov / 2 * Math.PI / 180);         var xd = 2 * distance * deltaX / element.clientHeight;       var yd = 2 * distance * deltaY / element.clientHeight;       panLeft( xd, scope.object.matrix );       panUp( yd, scope.object.matrix );         deltaVector.set(panOffset.x, panOffset.y, panOffset.z);       panOffset.set(0, 0, 0);       return deltaVector;       } else if ( scope.object instanceof OrthographicCamera ) {         // orthographic       panLeft( deltaX * ( scope.object.right - scope.object.left ) / scope.object.zoom / element.clientWidth, scope.object.matrix );       panUp( deltaY * ( scope.object.top - scope.object.bottom ) / scope.object.zoom / element.clientHeight, scope.object.matrix );         deltaVector.set(panOffset.x, panOffset.y, panOffset.z);       panOffset.set(0, 0, 0);       return deltaVector;     } else {         // camera neither orthographic nor perspective       console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - pan disabled.' );     }   }     this.dispose = function () {       scope.domElement.removeEventListener( 'contextmenu', onContextMenu, false );     scope.domElement.removeEventListener( 'mousedown', onMouseDown, false );     scope.domElement.removeEventListener( 'wheel', onMouseWheel, false );       scope.domElement.removeEventListener( 'touchstart', onTouchStart, false );     scope.domElement.removeEventListener( 'touchend', onTouchEnd, false );     scope.domElement.removeEventListener( 'touchmove', onTouchMove, false );       document.removeEventListener( 'mousemove', onMouseMove, false );     document.removeEventListener( 'mouseup', onMouseUp, false );       window.removeEventListener( 'keydown', onKeyDown, false );       //scope.dispatchEvent( { type: 'dispose' } ); // should this be added here?     };     this.getPixelMeterRatio = function(target) {     target = target ? target : scope.target;     var distance = scope.object.position.distanceTo(target);     return getPixelMeterRatioByDistance(distance);   }     function getPixelMeterRatioByDistance(distance) {     var element = scope.domElement === document ?       scope.domElement.body : scope.domElement;     // var distance = scope.object.position.distanceTo(target);     var h = scope.object instanceof PerspectiveCamera ?       (Math.tan(scope.object.fov / 2 * DEG2RAD) * distance) * 2 :       (scope.object.top - scope.object.bottom) / scope.object.zoom;     var meterPerPixel = h / element.clientHeight;       return meterPerPixel;   }     function getDistanceByPixelMeterRatio(ratio) {     var element = scope.domElement === document ?       scope.domElement.body : scope.domElement;     let cameraScreenHeight = ratio * element.clientHeight;     let distance = cameraScreenHeight / 2 / Math.tan((scope.object.fov || FOV) / 2 * DEG2RAD);       return distance;   }     function getZoomRange(ds) {     // return 5;     let meterPerPixel = scope.getPixelMeterRatio();     // var maxIdx = zoomRange.length - 1;     // if (meterPerPixel <= zoomRange[maxIdx]) {     //   return maxIdx + 1;     // } else if(meterPerPixel >= zoomRange[0]) {     //   return 0 + 1;     // }     // for (var i = 1, len = zoomRange.length; i < len; i++) {     //   if (meterPerPixel <= zoomRange[i] && meterPerPixel > zoomRange[i + 1]) {     //     return i + 1;     //   }     // }     return getZoomRangeByRatio(meterPerPixel);   }     function getZoomRangeByRatio(meterPerPixel) {     // let meterPerPixel = scope.getPixelMeterRatio();     var maxIdx = zoomRange.length - 1;     if (meterPerPixel <= zoomRange[maxIdx]) {       return maxIdx + 1;     } else if(meterPerPixel >= zoomRange[0]) {       return 0 + 1;     }     for (var i = 0, len = zoomRange.length; i < len; i++) {       if (meterPerPixel <= zoomRange[i] && meterPerPixel > zoomRange[i + 1]) {         return i + 1;       }     }   }     //   // internals   //     var scope = this;       var changeEvent = { type: 'change' };   var startEvent = { type: 'start' };   var endEvent = { type: 'end' };     var STATE = { NONE: - 1, ROTATE: 0, DOLLY: 1, PAN: 2, TOUCH_ROTATE: 3,     TOUCH_DOLLY: 4, TOUCH_PAN: 5, TOUCH_ROTATE_THETA: 6, TOUCH_ROTATE_PHI: 7 };     var state = STATE.NONE;     var EPS = 0.000001;     // current position in spherical coordinates   // 当前的球面坐标系；所有在屏幕的旋转最终都映射为球的转动；   // 也就是说你在2d屏幕的转动实际上相当于在转一个球   var spherical = new Spherical();   var sphericalDelta = new Spherical();     var scale = 1;   var panOffset = new Vector3();   var zoomChanged = false;     // 记录touchstart开始的时间，主要用于处理双指事件时判断是旋转还是缩放   var touchStartTime = null;     var rotateStart = new Vector2();   var rotateEnd = new Vector2();   var rotateDelta = new Vector2();     var touchThetaRotateStart = new Vector2();   var touchThetaRotateEnd = new Vector2();   var touchPhiFingerStart1 = new Vector2();   var touchPhiFingerEnd1 = new Vector2();   var touchPhiFingerStart2 = new Vector2();   var touchPhiFingerEnd2 = new Vector2();     var panStart = new Vector2();   var panEnd = new Vector2();   var panDelta = new Vector2();     var dollyStart = new Vector2();   var dollyEnd = new Vector2();   var dollyDelta = new Vector2();     function getAutoRotationAngle() {       return 2 * Math.PI / 60 / 60 * scope.autoRotateSpeed;     }     function getZoomScale() {       return Math.pow( 0.95, scope.zoomSpeed );     }     function rotateLeft( angle ) {// 绕y轴向左转     // console.log('rotateLeft: ' + sphericalDelta.theta * 180 / Math.PI + ' ' + angle * 180 / Math.PI);     sphericalDelta.theta -= angle;   }     function rotateUp( angle ) {// 极坐标向上转动     // console.log('rotateUp: ' + sphericalDelta.phi * 180 / Math.PI + ' ' + angle * 180 / Math.PI);     sphericalDelta.phi -= angle;   }   // x轴控制世界的左右、y轴控制世界的上下，z轴控制物体离屏幕的远近   var panLeft = function () {       var v = new Vector3();       return function panLeft( distance, objectMatrix ) {// panLeft只求出沿着x轴向左平移的距离         v.setFromMatrixColumn( objectMatrix, 0 ); // get X column of objectMatrix       v.multiplyScalar( - distance );         panOffset.add( v );       };     }();     var panUp = function () {       var v = new Vector3();       return function panUp( distance, objectMatrix ) {// panUp求出沿着y轴向上平移的距离         v.setFromMatrixColumn( objectMatrix, 1 ); // get Y column of objectMatrix         var h = v.dot(new Vector3(0, 1, 0));       v.sub(new Vector3(0, h, 0));       v.normalize();       v.multiplyScalar( distance );         panOffset.add( v );       };     }();     // deltaX and deltaY are in pixels; right and down are positive   var pan = function () {       var offset = new Vector3();       return function pan( deltaX, deltaY ) {         var element = scope.domElement === document ? scope.domElement.body : scope.domElement;         if ( scope.object instanceof PerspectiveCamera ) {           // perspective         var position = scope.object.position;         offset.copy( position ).sub( scope.target );         var targetDistance = offset.length();           // half of the fov is center to top of screen         targetDistance *= Math.tan( ( scope.object.fov / 2 ) * Math.PI / 180.0 );// 计算出透视屏幕的高度 // console.log('pan targetDistance: ',targetDistance);         // we actually don't use screenWidth, since perspective camera is fixed to screen height         // 不使用屏幕宽度，因为透视相机的屏幕高度是固定的         // 平移的要点是沿着相机投影屏幕的的x轴、y轴移动，也就是沿着相机的right轴和up轴移动         panLeft( 2 * deltaX * targetDistance / element.clientHeight, scope.object.matrix );         panUp( 2 * deltaY * targetDistance / element.clientHeight, scope.object.matrix );         } else if ( scope.object instanceof OrthographicCamera ) {           // orthographic         panLeft( deltaX * ( scope.object.right - scope.object.left ) / scope.object.zoom / element.clientWidth, scope.object.matrix );         panUp( deltaY * ( scope.object.top - scope.object.bottom ) / scope.object.zoom / element.clientHeight, scope.object.matrix );         } else {           // camera neither orthographic nor perspective         console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - pan disabled.' );         scope.enablePan = false;         }       };     }();     function dollyIn( dollyScale ) {       // if ( scope.object instanceof PerspectiveCamera ) {       if (INTOUCHDEVICE) {         scale = dollyScale;       } else {         scale /= dollyScale;       }     // } else     if ( scope.object instanceof OrthographicCamera ) {       console.log('dollyIn:   ', dollyScale);       if (INTOUCHDEVICE) {         scale = (2 - dollyScale / scope.object.zoom);       }           let zoom = scope.object.zoom;       if (INTOUCHDEVICE) {         zoom = dollyScale;       } else {         zoom = scope.object.zoom * dollyScale;       }       scope.object.zoom = Math.max( scope.minZoom, Math.min( scope.maxZoom, zoom ) );       scope.object.updateProjectionMatrix();       zoomChanged = true;       }     //  else {       //   console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled.' );     //   scope.enableZoom = false;       // }     }     function dollyOut( dollyScale ) {     // console.log()     // if ( scope.object instanceof PerspectiveCamera ) {       if (INTOUCHDEVICE) {         scale = dollyScale;       } else {         scale *= dollyScale;       }     // } else     if ( scope.object instanceof OrthographicCamera ) {       console.log('dollyOut:   ', dollyScale);       if (INTOUCHDEVICE) {         scale = (2 - dollyScale / scope.object.zoom);       }         let zoom = scope.object.zoom;       if (INTOUCHDEVICE) {         zoom = dollyScale;       } else {         zoom = scope.object.zoom / dollyScale;       }       scope.object.zoom = Math.max( scope.minZoom, Math.min( scope.maxZoom, zoom) );       scope.object.updateProjectionMatrix();       zoomChanged = true;       }     // else {       //   console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled.' );     //   scope.enableZoom = false;       // }     }     //   // event callbacks - update the object state   //     function handleMouseDownRotate( event ) {       //console.log( 'handleMouseDownRotate' );       rotateStart.set( event.clientX, event.clientY );     }     function handleMouseDownDolly( event ) {       //console.log( 'handleMouseDownDolly' );       dollyStart.set( event.clientX, event.clientY );     }     function handleMouseDownPan( event ) {       //console.log( 'handleMouseDownPan' );       panStart.set( event.clientX, event.clientY );     }     function handleMouseMoveRotate( event ) {       //console.log( 'handleMouseMoveRotate' );       rotateEnd.set( event.clientX, event.clientY );     rotateDelta.subVectors( rotateEnd, rotateStart );       var element = scope.domElement === document ? scope.domElement.body : scope.domElement;       // rotating across whole screen goes 360 degrees around     // 这是在转一个椭圆，将deltax映射成为弧度，类似于用周长代表角度     rotateLeft( 2 * Math.PI * rotateDelta.x / element.clientWidth * scope.rotateSpeed );       // rotating up and down along whole screen attempts to go 360, but limited to 180     rotateUp( 2 * Math.PI * rotateDelta.y / element.clientHeight * scope.rotateSpeed );       rotateStart.copy( rotateEnd );       scope.update();     }     function handleMouseMoveDolly( event ) {       //console.log( 'handleMouseMoveDolly' );       dollyEnd.set( event.clientX, event.clientY );       dollyDelta.subVectors( dollyEnd, dollyStart );       if ( dollyDelta.y > 0 ) { // 竟然只是简单的用y来控制每次的缩放差         dollyIn( getZoomScale() );       } else if ( dollyDelta.y < 0 ) {         dollyOut( getZoomScale() );       }       dollyStart.copy( dollyEnd );       scope.update();     }     function handleMouseMovePan( event ) {       //console.log( 'handleMouseMovePan' );       panEnd.set( event.clientX, event.clientY );       panDelta.subVectors( panEnd, panStart );       pan( panDelta.x, panDelta.y );       panStart.copy( panEnd );       scope.update();     }     function handleMouseUp( event ) {       // console.log( 'handleMouseUp' );     }     function handleMouseWheel( event ) {       // console.log( 'handleMouseWheel' );       if ( event.deltaY < 0 ) {         dollyOut( getZoomScale() );       } else if ( event.deltaY > 0 ) {         dollyIn( getZoomScale() );       }       scope.update();     }     function handleKeyDown( event ) {       //console.log( 'handleKeyDown' );       switch ( event.keyCode ) {         case scope.keys.UP:         pan( 0, scope.keyPanSpeed );         scope.update();         break;         case scope.keys.BOTTOM:         pan( 0, - scope.keyPanSpeed );         scope.update();         break;         case scope.keys.LEFT:         pan( scope.keyPanSpeed, 0 );         scope.update();         break;         case scope.keys.RIGHT:         pan( - scope.keyPanSpeed, 0 );         scope.update();         break;       }     }     function handleTouchStartRotate( event ) {       //console.log( 'handleTouchStartRotate' );       // rotateStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );       var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;     var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;     touchThetaRotateStart.set(dx, dy);       touchPhiFingerStart1.set(event.touches[0].pageX, event.touches[0].pageY);     touchPhiFingerStart2.set(event.touches[1].pageX, event.touches[1].pageY);   }     function handleTouchStartDolly( event ) {       //console.log( 'handleTouchStartDolly' );       var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;     var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;       var distance = Math.sqrt( dx * dx + dy * dy );       dollyStart.set( 0, distance );// touch情况下只是用两指之间距离来控制delta scale     }     function handleTouchStartPan( event ) {       //console.log( 'handleTouchStartPan' );       panStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );     }       function handleTouchMoveRotate( event ) {     var dx = event.touches[0].pageX - event.touches[1].pageX;     var dy = event.touches[0].pageY - event.touches[1].pageY;     touchThetaRotateEnd.set(dx, dy);     var element = scope.domElement === document ? scope.domElement.body : scope.domElement;       touchPhiFingerEnd1.set(event.touches[0].pageX, event.touches[0].pageY);     touchPhiFingerEnd2.set(event.touches[1].pageX, event.touches[1].pageY);     let deltaPhi = Math.PI *     (touchPhiFingerEnd1.y - touchPhiFingerStart1.y +       touchPhiFingerEnd2.y - touchPhiFingerStart2.y) /       2 / element.clientHeight;       // console.log(deltaPhi);     if (Math.abs(deltaPhi) > 0.01) {       rotateUp(deltaPhi);     }       var costheta = touchThetaRotateEnd.dot(touchThetaRotateStart) /       (touchThetaRotateStart.length() * touchThetaRotateEnd.length());     // console.log('costheta', costheta);     var cross = touchThetaRotateStart.x * touchThetaRotateEnd.y -       touchThetaRotateEnd.x * touchThetaRotateStart.y;     // console.log('cross', cross);     var theta = Math.acos(costheta);     // console.log('theta', theta);     // 防止浮点数精度问题引发问题，比如Math.acos(1.000000000000002);     theta = typeof theta === 'number' && isFinite(theta) ? theta : 0;     if (Math.abs(theta) > 0.01) {       sphericalDelta.theta = cross >= 0 ? theta : -theta;     }       touchThetaRotateStart.copy(touchThetaRotateEnd);     touchPhiFingerStart1.copy(touchPhiFingerEnd1);     touchPhiFingerStart2.copy(touchPhiFingerEnd2);       scope.update();   }     function handleTouchMoveDolly( event ) {       // console.log( 'handleTouchMoveDolly' );       var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;     var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;       var distance = Math.sqrt( dx * dx + dy * dy );       dollyEnd.set( 0, distance );       dollyDelta.subVectors( dollyEnd, dollyStart );     // console.log(dollyDelta, dollyStart);     // console.log('handleTouchMoveDolly:   ', (1 - dollyDelta.y / dollyStart.y));     if (scope.object instanceof PerspectiveCamera) {       if ( dollyDelta.y > 0 ) {         dollyOut( 1 - dollyDelta.y / dollyStart.y );       } else if ( dollyDelta.y < 0 ) {         dollyIn( 1 - dollyDelta.y / dollyStart.y );       }     } else if (scope.object instanceof OrthographicCamera) {         if ( dollyDelta.y > 0 ) {         dollyOut(scope.object.zoom * (1 + dollyDelta.y / dollyStart.y));       } else if ( dollyDelta.y < 0 ) {         dollyIn(scope.object.zoom * ( 1 + dollyDelta.y / dollyStart.y ));       }     }       dollyStart.copy( dollyEnd );           scope.update();     }     function handleTouchMovePan( event ) {       // console.log( 'handleTouchMovePan' );       panEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );       panDelta.subVectors( panEnd, panStart );       pan( panDelta.x, panDelta.y );       panStart.copy( panEnd );       scope.update();     }     function handleTouchEnd( event ) {       //console.log( 'handleTouchEnd' );     }     //   // event handlers - FSM: listen for events and reset state   //     function onMouseDown( event ) {       if ( scope.enabled === false ) return;       event.preventDefault();       switch ( event.button ) {         case scope.mouseButtons.ORBIT:           if ( scope.enableRotate === false ) return;           handleMouseDownRotate( event );           state = STATE.ROTATE;           break;         case scope.mouseButtons.ZOOM:           if ( scope.enableZoom === false ) return;           handleMouseDownDolly( event );           state = STATE.DOLLY;           break;         case scope.mouseButtons.PAN:           if ( scope.enablePan === false ) return;           handleMouseDownPan( event );           state = STATE.PAN;           break;       }       if ( state !== STATE.NONE ) {         document.addEventListener( 'mousemove', onMouseMove, false );       document.addEventListener( 'mouseup', onMouseUp, false );         scope.dispatchEvent( startEvent );       }     }     function onMouseMove( event ) {       if ( scope.enabled === false ) return;       event.preventDefault();       switch ( state ) {         case STATE.ROTATE:           if ( scope.enableRotate === false ) return;           handleMouseMoveRotate( event );           break;         case STATE.DOLLY:           if ( scope.enableZoom === false ) return;           handleMouseMoveDolly( event );           break;         case STATE.PAN:           if ( scope.enablePan === false ) return;           handleMouseMovePan( event );           break;       }     }     function onMouseUp( event ) {       if ( scope.enabled === false ) return;       handleMouseUp( event );       document.removeEventListener( 'mousemove', onMouseMove, false );     document.removeEventListener( 'mouseup', onMouseUp, false );       scope.dispatchEvent( endEvent );       state = STATE.NONE;     }     function onMouseWheel( event ) {       if ( scope.enabled === false || scope.enableZoom === false || ( state !== STATE.NONE && state !== STATE.ROTATE ) ) return;       event.preventDefault();     event.stopPropagation();       handleMouseWheel( event );       scope.dispatchEvent( startEvent ); // not sure why these are here...     scope.dispatchEvent( endEvent );     }     function onKeyDown( event ) {       if ( scope.enabled === false || scope.enableKeys === false || scope.enablePan === false ) return;       handleKeyDown( event );     }     function onTouchStart( event ) {     if ( scope.enabled === false ) return;     console.log('OrbitControls+_start');       switch ( event.touches.length ) {         // case 1: // one-fingered touch: rotate         //   if ( scope.enableRotate === false ) return;         //   handleTouchStartRotate( event );         //   state = STATE.TOUCH_ROTATE;         //   break;         case 2: // two-fingered touch: dolly or rotate           // if ( scope.enableZoom === false ) return;           // handleTouchStartDolly( event );           // state = STATE.TOUCH_DOLLY;         touchStartTime = Date.now();         if (scope.enableZoom) {           handleTouchStartDolly( event );         }         if (scope.enableRotate) {           handleTouchStartRotate( event );         }         state = STATE.NONE;         break;         case 1: // one-fingered touch: pan           if ( scope.enablePan === false ) return;           handleTouchStartPan( event );           state = STATE.TOUCH_PAN;           break;         default:           state = STATE.NONE;       }       if ( state !== STATE.NONE ) {         scope.dispatchEvent( startEvent );       }     }     function onTouchMove( event ) {     // console.log('OrbitControls+_move');       if ( scope.enabled === false ) return;       event.preventDefault();     event.stopPropagation();       switch ( event.touches.length ) {         // case 1: // one-fingered touch: rotate         //   if ( scope.enableRotate === false ) return;       //   if ( state !== STATE.TOUCH_ROTATE ) return; // is this needed?...         //   handleTouchMoveRotate( event );         //   break;         case 2: // two-fingered touch: dolly           // if ( scope.enableZoom === false ) return;         // if ( state !== STATE.TOUCH_DOLLY ) return; // is this needed?...           handleTouchMoveDolly( event );         handleTouchMoveRotate(event);           // if (state === STATE.NONE) {         //   var now = Date.now();         //   // 如果双指在50ms内进行了缩放操作则记录state为dolly         //   // 否则为Pan，在移动时无论是Pan还是dolly都会同时处理移动和缩放         //   if (now - touchStartTime >= 200) {         //     // 记录移动距离         //     var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;         //     var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;         //     var distance = Math.sqrt( dx * dx + dy * dy );         //     dollyEnd.set( 0, distance );         //     dollyDelta.subVectors( dollyEnd, dollyStart );         //     let dollyLength = dollyDelta.length();           //     touchThetaRotateEnd.set(dx, dy);         //     var costheta = touchThetaRotateEnd.dot(touchThetaRotateStart) / (touchThetaRotateStart.length() * touchThetaRotateEnd.length());         //     var theta = Math.acos(costheta);           //     touchPhiFingerEnd1.set(event.touches[0].pageX, event.touches[0].pageY);         //     touchPhiFingerEnd2.set(event.touches[1].pageX, event.touches[1].pageY);           //     if (Math.abs(dollyLength) >= 10) {         //       state = STATE.TOUCH_DOLLY; // 既可以缩放又可以theta旋转           //     } else if (theta > 5 * Math.PI / 180) {         //       state = STATE.TOUCH_ROTATE_THETA;         //     } else if (Math.abs(touchPhiFingerEnd1.x - touchPhiFingerStart1.x) < 5 &&         //       Math.abs(touchPhiFingerEnd2.x - touchPhiFingerStart2.x) < 5 &&         //       (Math.abs(touchPhiFingerEnd1.y - touchPhiFingerStart1.y) > 5) &&         //       (Math.abs(touchPhiFingerEnd2.y - touchPhiFingerStart2.y) > 5)) {         //       state = STATE.TOUCH_ROTATE_PHI;         //     }         //     dollyStart.copy(dollyEnd);         //     dollyDelta.subVectors(dollyEnd, dollyStart);         //     touchThetaRotateStart.copy(touchThetaRotateEnd);         //     touchPhiFingerStart1.copy(touchPhiFingerEnd1);         //     touchPhiFingerStart2.copy(touchPhiFingerEnd2);         //   } else if (now - touchStartTime >= 400) {         //     state = STATE.TOUCH_DOLLY;         //   } else {         //     state = STATE.NONE;         //   }         // } else if (state === STATE.TOUCH_DOLLY && scope.enableZoom) {         //   handleTouchMoveDolly(event);         //   handleTouchMoveRotate(event);         // } else if ((state === STATE.TOUCH_ROTATE ||         //   state === STATE.TOUCH_ROTATE_THETA || state === STATE.TOUCH_ROTATE_PHI) &&         //   scope.enableRotate) {         //   if (state === STATE.TOUCH_ROTATE_THETA) {         //     handleTouchMoveDolly(event);         //   }         //   handleTouchMoveRotate(event);         // }         break;         case 1: // one-fingered touch: pan           if ( scope.enablePan === false ) return;         // if ( state !== STATE.TOUCH_PAN ) return; // is this needed?...         if (state !== STATE.TOUCH_PAN) {// 处理突然由两指变成单指情况           handleTouchStartPan( event );         } else {           handleTouchMovePan( event );         }           state = STATE.TOUCH_PAN;           break;         default:           state = STATE.NONE;       }     }     function onTouchEnd( event ) {       if ( scope.enabled === false ) return;       handleTouchEnd( event );       scope.dispatchEvent( endEvent );       state = STATE.NONE;     }     function onContextMenu( event ) {       event.preventDefault();     }       if (INTOUCHDEVICE) {     scope.domElement.addEventListener( 'touchstart', onTouchStart, false );     scope.domElement.addEventListener( 'touchend', onTouchEnd, false );     scope.domElement.addEventListener( 'touchmove',       onTouchMove     , false );   } else {     scope.domElement.addEventListener( 'contextmenu', onContextMenu, false );     scope.domElement.addEventListener( 'mousedown', onMouseDown, false );     scope.domElement.addEventListener( 'wheel', onMouseWheel, false );     window.addEventListener( 'keydown', onKeyDown, false );   }     // force an update at start     this.update();     this.pan = pan;   this.rotate = function(theta, phi) {     if (typeof theta === 'number' && isFinite(theta)) {       sphericalDelta.theta -= theta;     }     if (typeof phi === 'number' && isFinite(phi)) {       sphericalDelta.phi -= phi;     }       scope.update();   };   this.getMinDistanceByZoom = function() {     return getDistanceByPixelMeterRatio(zoomRange[zoomRange.length - 1]);   };   this.getMaxDistanceByZoom = function() {     return getDistanceByPixelMeterRatio(zoomRange[0]);   };   this.getDistanceByZoom = function(zoom) {     // zoom代表数据侧zoom：1-7     return getDistanceByPixelMeterRatio(zoomRange[zoom - 1]);   };   this.getZoomByDistance = function(distance) {     var meterPerPixel = getPixelMeterRatioByDistance(distance);       var mapZoom = getZoomRangeByRatio(meterPerPixel);     return mapZoom;   }; }; OrbitControls = OrbitControls; OrbitControls.prototype = Object.create( EventDispatcher.prototype ); OrbitControls.prototype.constructor = OrbitControls;   Object.defineProperties( OrbitControls.prototype, {     center: {       get: function () {         console.warn( 'OrbitControls: .center has been renamed to .target' );       return this.target;       }     },     // backward compatibility     noZoom: {       get: function () {         console.warn( 'OrbitControls: .noZoom has been deprecated. Use .enableZoom instead.' );       return ! this.enableZoom;       },       set: function ( value ) {         console.warn( 'OrbitControls: .noZoom has been deprecated. Use .enableZoom instead.' );       this.enableZoom = ! value;       }     },     noRotate: {       get: function () {         console.warn( 'OrbitControls: .noRotate has been deprecated. Use .enableRotate instead.' );       return ! this.enableRotate;       },       set: function ( value ) {         console.warn( 'OrbitControls: .noRotate has been deprecated. Use .enableRotate instead.' );       this.enableRotate = ! value;       }     },     noPan: {       get: function () {         console.warn( 'OrbitControls: .noPan has been deprecated. Use .enablePan instead.' );       return ! this.enablePan;       },       set: function ( value ) {         console.warn( 'OrbitControls: .noPan has been deprecated. Use .enablePan instead.' );       this.enablePan = ! value;       }     },     noKeys: {       get: function () {         console.warn( 'OrbitControls: .noKeys has been deprecated. Use .enableKeys instead.' );       return ! this.enableKeys;       },       set: function ( value ) {         console.warn( 'OrbitControls: .noKeys has been deprecated. Use .enableKeys instead.' );       this.enableKeys = ! value;       }     },     staticMoving: {       get: function () {         console.warn( 'OrbitControls: .staticMoving has been deprecated. Use .enableDamping instead.' );       return ! this.enableDamping;       },       set: function ( value ) {         console.warn( 'OrbitControls: .staticMoving has been deprecated. Use .enableDamping instead.' );       this.enableDamping = ! value;       }     },     dynamicDampingFactor: {       get: function () {         console.warn( 'OrbitControls: .dynamicDampingFactor has been renamed. Use .dampingFactor instead.' );       return this.dampingFactor;       },       set: function ( value ) {         console.warn( 'OrbitControls: .dynamicDampingFactor has been renamed. Use .dampingFactor instead.' );       this.dampingFactor = value;       }     }   } );         }       function handleTouchMoveRotate( event ) {     var dx = event.touches[0].pageX - event.touches[1].pageX;     var dy = event.touches[0].pageY - event.touches[1].pageY;     touchThetaRotateEnd.set(dx, dy);     var element = scope.domElement === document ? scope.domElement.body : scope.domElement;       touchPhiFingerEnd1.set(event.touches[0].pageX, event.touches[0].pageY);     touchPhiFingerEnd2.set(event.touches[1].pageX, event.touches[1].pageY);     let deltaPhi = Math.PI *     (touchPhiFingerEnd1.y - touchPhiFingerStart1.y +       touchPhiFingerEnd2.y - touchPhiFingerStart2.y) /       2 / element.clientHeight;       // console.log(deltaPhi);     if (Math.abs(deltaPhi) > 0.01) {       rotateUp(deltaPhi);     }       var costheta = touchThetaRotateEnd.dot(touchThetaRotateStart) /       (touchThetaRotateStart.length() * touchThetaRotateEnd.length());     // console.log('costheta', costheta);     var cross = touchThetaRotateStart.x * touchThetaRotateEnd.y -       touchThetaRotateEnd.x * touchThetaRotateStart.y;     // console.log('cross', cross);     var theta = Math.acos(costheta);     // console.log('theta', theta);     // 防止浮点数精度问题引发问题，比如Math.acos(1.000000000000002);     theta = typeof theta === 'number' && isFinite(theta) ? theta : 0;     if (Math.abs(theta) > 0.01) {       sphericalDelta.theta = cross >= 0 ? theta : -theta;     }       touchThetaRotateStart.copy(touchThetaRotateEnd);     touchPhiFingerStart1.copy(touchPhiFingerEnd1);     touchPhiFingerStart2.copy(touchPhiFingerEnd2);       scope.update();   }     function handleTouchMoveDolly( event ) {       // console.log( 'handleTouchMoveDolly' );       var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;     var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;       var distance = Math.sqrt( dx * dx + dy * dy );       dollyEnd.set( 0, distance );       dollyDelta.subVectors( dollyEnd, dollyStart );     // console.log(dollyDelta, dollyStart);     // console.log('handleTouchMoveDolly:   ', (1 - dollyDelta.y / dollyStart.y));     if (scope.object instanceof PerspectiveCamera) {       if ( dollyDelta.y > 0 ) {         dollyOut( 1 - dollyDelta.y / dollyStart.y );       } else if ( dollyDelta.y < 0 ) {         dollyIn( 1 - dollyDelta.y / dollyStart.y );       }     } else if (scope.object instanceof OrthographicCamera) {         if ( dollyDelta.y > 0 ) {         dollyOut(scope.object.zoom * (1 + dollyDelta.y / dollyStart.y));       } else if ( dollyDelta.y < 0 ) {         dollyIn(scope.object.zoom * ( 1 + dollyDelta.y / dollyStart.y ));       }     }       dollyStart.copy( dollyEnd );           scope.update();     }     function handleTouchMovePan( event ) {       // console.log( 'handleTouchMovePan' );       panEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );       panDelta.subVectors( panEnd, panStart );       pan( panDelta.x, panDelta.y );       panStart.copy( panEnd );       scope.update();     }     function handleTouchEnd( event ) {       //console.log( 'handleTouchEnd' );     }     //   // event handlers - FSM: listen for events and reset state   //     function onMouseDown( event ) {       if ( scope.enabled === false ) return;       event.preventDefault();       switch ( event.button ) {         case scope.mouseButtons.ORBIT:           if ( scope.enableRotate === false ) return;           handleMouseDownRotate( event );           state = STATE.ROTATE;           break;         case scope.mouseButtons.ZOOM:           if ( scope.enableZoom === false ) return;           handleMouseDownDolly( event );           state = STATE.DOLLY;           break;         case scope.mouseButtons.PAN:           if ( scope.enablePan === false ) return;           handleMouseDownPan( event );           state = STATE.PAN;           break;       }       if ( state !== STATE.NONE ) {         document.addEventListener( 'mousemove', onMouseMove, false );       document.addEventListener( 'mouseup', onMouseUp, false );         scope.dispatchEvent( startEvent );       }     }     function onMouseMove( event ) {       if ( scope.enabled === false ) return;       event.preventDefault();       switch ( state ) {         case STATE.ROTATE:           if ( scope.enableRotate === false ) return;           handleMouseMoveRotate( event );           break;         case STATE.DOLLY:           if ( scope.enableZoom === false ) return;           handleMouseMoveDolly( event );           break;         case STATE.PAN:           if ( scope.enablePan === false ) return;           handleMouseMovePan( event );           break;       }     }     function onMouseUp( event ) {       if ( scope.enabled === false ) return;       handleMouseUp( event );       document.removeEventListener( 'mousemove', onMouseMove, false );     document.removeEventListener( 'mouseup', onMouseUp, false );       scope.dispatchEvent( endEvent );       state = STATE.NONE;     }     function onMouseWheel( event ) {       if ( scope.enabled === false || scope.enableZoom === false || ( state !== STATE.NONE && state !== STATE.ROTATE ) ) return;       event.preventDefault();     event.stopPropagation();       handleMouseWheel( event );       scope.dispatchEvent( startEvent ); // not sure why these are here...     scope.dispatchEvent( endEvent );     }     function onKeyDown( event ) {       if ( scope.enabled === false || scope.enableKeys === false || scope.enablePan === false ) return;       handleKeyDown( event );     }     function onTouchStart( event ) {     if ( scope.enabled === false ) return;     console.log('OrbitControls+_start');       switch ( event.touches.length ) {         // case 1: // one-fingered touch: rotate         //   if ( scope.enableRotate === false ) return;         //   handleTouchStartRotate( event );         //   state = STATE.TOUCH_ROTATE;         //   break;         case 2: // two-fingered touch: dolly or rotate           // if ( scope.enableZoom === false ) return;           // handleTouchStartDolly( event );           // state = STATE.TOUCH_DOLLY;         touchStartTime = Date.now();         if (scope.enableZoom) {           handleTouchStartDolly( event );         }         if (scope.enableRotate) {           handleTouchStartRotate( event );         }         state = STATE.NONE;         break;         case 1: // one-fingered touch: pan           if ( scope.enablePan === false ) return;           handleTouchStartPan( event );           state = STATE.TOUCH_PAN;           break;         default:           state = STATE.NONE;       }       if ( state !== STATE.NONE ) {         scope.dispatchEvent( startEvent );       }     }     function onTouchMove( event ) {     // console.log('OrbitControls+_move');       if ( scope.enabled === false ) return;       event.preventDefault();     event.stopPropagation();       switch ( event.touches.length ) {         // case 1: // one-fingered touch: rotate         //   if ( scope.enableRotate === false ) return;       //   if ( state !== STATE.TOUCH_ROTATE ) return; // is this needed?...         //   handleTouchMoveRotate( event );         //   break;         case 2: // two-fingered touch: dolly           // if ( scope.enableZoom === false ) return;         // if ( state !== STATE.TOUCH_DOLLY ) return; // is this needed?...           handleTouchMoveDolly( event );         handleTouchMoveRotate(event);           // if (state === STATE.NONE) {         //   var now = Date.now();         //   // 如果双指在50ms内进行了缩放操作则记录state为dolly         //   // 否则为Pan，在移动时无论是Pan还是dolly都会同时处理移动和缩放         //   if (now - touchStartTime >= 200) {         //     // 记录移动距离         //     var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;         //     var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;         //     var distance = Math.sqrt( dx * dx + dy * dy );         //     dollyEnd.set( 0, distance );         //     dollyDelta.subVectors( dollyEnd, dollyStart );         //     let dollyLength = dollyDelta.length();           //     touchThetaRotateEnd.set(dx, dy);         //     var costheta = touchThetaRotateEnd.dot(touchThetaRotateStart) / (touchThetaRotateStart.length() * touchThetaRotateEnd.length());         //     var theta = Math.acos(costheta);           //     touchPhiFingerEnd1.set(event.touches[0].pageX, event.touches[0].pageY);         //     touchPhiFingerEnd2.set(event.touches[1].pageX, event.touches[1].pageY);           //     if (Math.abs(dollyLength) >= 10) {         //       state = STATE.TOUCH_DOLLY; // 既可以缩放又可以theta旋转           //     } else if (theta > 5 * Math.PI / 180) {         //       state = STATE.TOUCH_ROTATE_THETA;         //     } else if (Math.abs(touchPhiFingerEnd1.x - touchPhiFingerStart1.x) < 5 &&         //       Math.abs(touchPhiFingerEnd2.x - touchPhiFingerStart2.x) < 5 &&         //       (Math.abs(touchPhiFingerEnd1.y - touchPhiFingerStart1.y) > 5) &&         //       (Math.abs(touchPhiFingerEnd2.y - touchPhiFingerStart2.y) > 5)) {         //       state = STATE.TOUCH_ROTATE_PHI;         //     }         //     dollyStart.copy(dollyEnd);         //     dollyDelta.subVectors(dollyEnd, dollyStart);         //     touchThetaRotateStart.copy(touchThetaRotateEnd);         //     touchPhiFingerStart1.copy(touchPhiFingerEnd1);         //     touchPhiFingerStart2.copy(touchPhiFingerEnd2);         //   } else if (now - touchStartTime >= 400) {         //     state = STATE.TOUCH_DOLLY;         //   } else {         //     state = STATE.NONE;         //   }         // } else if (state === STATE.TOUCH_DOLLY && scope.enableZoom) {         //   handleTouchMoveDolly(event);         //   handleTouchMoveRotate(event);         // } else if ((state === STATE.TOUCH_ROTATE ||         //   state === STATE.TOUCH_ROTATE_THETA || state === STATE.TOUCH_ROTATE_PHI) &&         //   scope.enableRotate) {         //   if (state === STATE.TOUCH_ROTATE_THETA) {         //     handleTouchMoveDolly(event);         //   }         //   handleTouchMoveRotate(event);         // }         break;         case 1: // one-fingered touch: pan           if ( scope.enablePan === false ) return;         // if ( state !== STATE.TOUCH_PAN ) return; // is this needed?...         if (state !== STATE.TOUCH_PAN) {// 处理突然由两指变成单指情况           handleTouchStartPan( event );         } else {           handleTouchMovePan( event );         }           state = STATE.TOUCH_PAN;           break;         default:           state = STATE.NONE;       }     }     function onTouchEnd( event ) {       if ( scope.enabled === false ) return;       handleTouchEnd( event );       scope.dispatchEvent( endEvent );       state = STATE.NONE;     }     function onContextMenu( event ) {       event.preventDefault();     }       if (INTOUCHDEVICE) {     scope.domElement.addEventListener( 'touchstart', onTouchStart, false );     scope.domElement.addEventListener( 'touchend', onTouchEnd, false );     scope.domElement.addEventListener( 'touchmove',       onTouchMove     , false );   } else {     scope.domElement.addEventListener( 'contextmenu', onContextMenu, false );     scope.domElement.addEventListener( 'mousedown', onMouseDown, false );     scope.domElement.addEventListener( 'wheel', onMouseWheel, false );     window.addEventListener( 'keydown', onKeyDown, false );   }     // force an update at start     this.update();     this.pan = pan;   this.rotate = function(theta, phi) {     if (typeof theta === 'number' && isFinite(theta)) {       sphericalDelta.theta -= theta;     }     if (typeof phi === 'number' && isFinite(phi)) {       sphericalDelta.phi -= phi;     }       scope.update();   };   this.getMinDistanceByZoom = function() {     return getDistanceByPixelMeterRatio(zoomRange[zoomRange.length - 1]);   };   this.getMaxDistanceByZoom = function() {     return getDistanceByPixelMeterRatio(zoomRange[0]);   }   }; OrbitControls = OrbitControls; OrbitControls.prototype = Object.create( EventDispatcher.prototype ); OrbitControls.prototype.constructor = OrbitControls;   Object.defineProperties( OrbitControls.prototype, {     center: {       get: function () {         console.warn( 'OrbitControls: .center has been renamed to .target' );       return this.target;       }     },     // backward compatibility     noZoom: {       get: function () {         console.warn( 'OrbitControls: .noZoom has been deprecated. Use .enableZoom instead.' );       return ! this.enableZoom;       },       set: function ( value ) {         console.warn( 'OrbitControls: .noZoom has been deprecated. Use .enableZoom instead.' );       this.enableZoom = ! value;       }     },     noRotate: {       get: function () {         console.warn( 'OrbitControls: .noRotate has been deprecated. Use .enableRotate instead.' );       return ! this.enableRotate;       },       set: function ( value ) {         console.warn( 'OrbitControls: .noRotate has been deprecated. Use .enableRotate instead.' );       this.enableRotate = ! value;       }     },     noPan: {       get: function () {         console.warn( 'OrbitControls: .noPan has been deprecated. Use .enablePan instead.' );       return ! this.enablePan;       },       set: function ( value ) {         console.warn( 'OrbitControls: .noPan has been deprecated. Use .enablePan instead.' );       this.enablePan = ! value;       }     },     noKeys: {       get: function () {         console.warn( 'OrbitControls: .noKeys has been deprecated. Use .enableKeys instead.' );       return ! this.enableKeys;       },       set: function ( value ) {         console.warn( 'OrbitControls: .noKeys has been deprecated. Use .enableKeys instead.' );       this.enableKeys = ! value;       }     },     staticMoving: {       get: function () {         console.warn( 'OrbitControls: .staticMoving has been deprecated. Use .enableDamping instead.' );       return ! this.enableDamping;       },       set: function ( value ) {         console.warn( 'OrbitControls: .staticMoving has been deprecated. Use .enableDamping instead.' );       this.enableDamping = ! value;       }     },     dynamicDampingFactor: {       get: function () {         console.warn( 'OrbitControls: .dynamicDampingFactor has been renamed. Use .dampingFactor instead.' );       return this.dampingFactor;       },       set: function ( value ) {         console.warn( 'OrbitControls: .dynamicDampingFactor has been renamed. Use .dampingFactor instead.' );       this.dampingFactor = value;       }     }   } );