all files / ol/ extent.js

100% Statements 322/322
99.24% Branches 131/132
100% Functions 50/50
100% Lines 322/322
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                                                                                   660× 660× 2400×   660×                     280× 280× 280× 280× 280× 280× 280×                       111× 37× 37× 37× 37× 37×   74×                                 100× 77× 77× 77× 77× 77×   23×                                                   66×                               174×                           78×                     340× 340× 340× 340× 340× 340× 340× 340× 49× 291× 58×   340× 56× 284× 65×   340× 194×   340×                 3528×                         999× 627× 627× 627× 627× 627×   372×                   320×                   270× 270× 270×                                         309× 309×                                                       129×                       17× 14×   17× 14×   17× 13×   17× 15×   17×               3297× 711×   3297× 1340×   3297× 1304×   3297× 753×                   10× 10× 36×   10×                         355× 7969×     355×                                   7969× 7969× 7969× 7969×                           32× 32× 32× 15×   17× 17×   15× 15×   13× 13×   11×               22× 22× 20×   22×                   48×                   33×                   19×                   38× 38× 36× 34× 31×     37× 37×                                         91× 91× 91× 91×   91×   91× 91× 91× 364× 364× 364× 364×   91×                   269×                                       33× 33× 29×   20×   29× 14×   15×   29× 10×   19×   29× 13×   16×     33×                                                   105×                   31×                   875×                     432×                         33×                                                       920×   919×                                       74× 74× 74× 74×   15×   59× 59× 59× 59× 59× 59× 59× 59× 59× 59× 59×     21× 21×   59×     21× 21×   59×     16× 16×   59×           74×                                             189×           189× 189× 189× 189×                     16× 16× 16× 16×      
goog.provide('ol.Extent');
goog.provide('ol.extent');
goog.provide('ol.extent.Corner');
goog.provide('ol.extent.Relationship');
 
goog.require('goog.asserts');
goog.require('goog.vec.Mat4');
goog.require('ol.Coordinate');
goog.require('ol.Size');
goog.require('ol.TransformFunction');
 
 
/**
 * An array of numbers representing an extent: `[minx, miny, maxx, maxy]`.
 * @typedef {Array.<number>}
 * @api stable
 */
ol.Extent;
 
 
/**
 * Extent corner.
 * @enum {string}
 */
ol.extent.Corner = {
  BOTTOM_LEFT: 'bottom-left',
  BOTTOM_RIGHT: 'bottom-right',
  TOP_LEFT: 'top-left',
  TOP_RIGHT: 'top-right'
};
 
 
/**
 * Relationship to an extent.
 * @enum {number}
 */
ol.extent.Relationship = {
  UNKNOWN: 0,
  INTERSECTING: 1,
  ABOVE: 2,
  RIGHT: 4,
  BELOW: 8,
  LEFT: 16
};
 
 
/**
 * Build an extent that includes all given coordinates.
 *
 * @param {Array.<ol.Coordinate>} coordinates Coordinates.
 * @return {ol.Extent} Bounding extent.
 * @api stable
 */
ol.extent.boundingExtent = function(coordinates) {
  var extent = ol.extent.createEmpty();
  for (var i = 0, ii = coordinates.length; i < ii; ++i) {
    ol.extent.extendCoordinate(extent, coordinates[i]);
  }
  return extent;
};
 
 
/**
 * @param {Array.<number>} xs Xs.
 * @param {Array.<number>} ys Ys.
 * @param {ol.Extent=} opt_extent Destination extent.
 * @private
 * @return {ol.Extent} Extent.
 */
ol.extent.boundingExtentXYs_ = function(xs, ys, opt_extent) {
  goog.asserts.assert(xs.length > 0, 'xs length should be larger than 0');
  goog.asserts.assert(ys.length > 0, 'ys length should be larger than 0');
  var minX = Math.min.apply(null, xs);
  var minY = Math.min.apply(null, ys);
  var maxX = Math.max.apply(null, xs);
  var maxY = Math.max.apply(null, ys);
  return ol.extent.createOrUpdate(minX, minY, maxX, maxY, opt_extent);
};
 
 
/**
 * Return extent increased by the provided value.
 * @param {ol.Extent} extent Extent.
 * @param {number} value The amount by which the extent should be buffered.
 * @param {ol.Extent=} opt_extent Extent.
 * @return {ol.Extent} Extent.
 * @api stable
 */
ol.extent.buffer = function(extent, value, opt_extent) {
  if (opt_extent) {
    opt_extent[0] = extent[0] - value;
    opt_extent[1] = extent[1] - value;
    opt_extent[2] = extent[2] + value;
    opt_extent[3] = extent[3] + value;
    return opt_extent;
  } else {
    return [
      extent[0] - value,
      extent[1] - value,
      extent[2] + value,
      extent[3] + value
    ];
  }
};
 
 
/**
 * Creates a clone of an extent.
 *
 * @param {ol.Extent} extent Extent to clone.
 * @param {ol.Extent=} opt_extent Extent.
 * @return {ol.Extent} The clone.
 */
ol.extent.clone = function(extent, opt_extent) {
  if (opt_extent) {
    opt_extent[0] = extent[0];
    opt_extent[1] = extent[1];
    opt_extent[2] = extent[2];
    opt_extent[3] = extent[3];
    return opt_extent;
  } else {
    return extent.slice();
  }
};
 
 
/**
 * @param {ol.Extent} extent Extent.
 * @param {number} x X.
 * @param {number} y Y.
 * @return {number} Closest squared distance.
 */
ol.extent.closestSquaredDistanceXY = function(extent, x, y) {
  var dx, dy;
  if (x < extent[0]) {
    dx = extent[0] - x;
  } else if (extent[2] < x) {
    dx = x - extent[2];
  } else {
    dx = 0;
  }
  if (y < extent[1]) {
    dy = extent[1] - y;
  } else if (extent[3] < y) {
    dy = y - extent[3];
  } else {
    dy = 0;
  }
  return dx * dx + dy * dy;
};
 
 
/**
 * Check if the passed coordinate is contained or on the edge of the extent.
 *
 * @param {ol.Extent} extent Extent.
 * @param {ol.Coordinate} coordinate Coordinate.
 * @return {boolean} The coordinate is contained in the extent.
 * @api stable
 */
ol.extent.containsCoordinate = function(extent, coordinate) {
  return ol.extent.containsXY(extent, coordinate[0], coordinate[1]);
};
 
 
/**
 * Check if one extent contains another.
 *
 * An extent is deemed contained if it lies completely within the other extent,
 * including if they share one or more edges.
 *
 * @param {ol.Extent} extent1 Extent 1.
 * @param {ol.Extent} extent2 Extent 2.
 * @return {boolean} The second extent is contained by or on the edge of the
 *     first.
 * @api stable
 */
ol.extent.containsExtent = function(extent1, extent2) {
  return extent1[0] <= extent2[0] && extent2[2] <= extent1[2] &&
      extent1[1] <= extent2[1] && extent2[3] <= extent1[3];
};
 
 
/**
 * Check if the passed coordinate is contained or on the edge of the extent.
 *
 * @param {ol.Extent} extent Extent.
 * @param {number} x X coordinate.
 * @param {number} y Y coordinate.
 * @return {boolean} The x, y values are contained in the extent.
 * @api stable
 */
ol.extent.containsXY = function(extent, x, y) {
  return extent[0] <= x && x <= extent[2] && extent[1] <= y && y <= extent[3];
};
 
 
/**
 * Get the relationship between a coordinate and extent.
 * @param {ol.Extent} extent The extent.
 * @param {ol.Coordinate} coordinate The coordinate.
 * @return {number} The relationship (bitwise compare with
 *     ol.extent.Relationship).
 */
ol.extent.coordinateRelationship = function(extent, coordinate) {
  var minX = extent[0];
  var minY = extent[1];
  var maxX = extent[2];
  var maxY = extent[3];
  var x = coordinate[0];
  var y = coordinate[1];
  var relationship = ol.extent.Relationship.UNKNOWN;
  if (x < minX) {
    relationship = relationship | ol.extent.Relationship.LEFT;
  } else if (x > maxX) {
    relationship = relationship | ol.extent.Relationship.RIGHT;
  }
  if (y < minY) {
    relationship = relationship | ol.extent.Relationship.BELOW;
  } else if (y > maxY) {
    relationship = relationship | ol.extent.Relationship.ABOVE;
  }
  if (relationship === ol.extent.Relationship.UNKNOWN) {
    relationship = ol.extent.Relationship.INTERSECTING;
  }
  return relationship;
};
 
 
/**
 * Create an empty extent.
 * @return {ol.Extent} Empty extent.
 * @api stable
 */
ol.extent.createEmpty = function() {
  return [Infinity, Infinity, -Infinity, -Infinity];
};
 
 
/**
 * Create a new extent or update the provided extent.
 * @param {number} minX Minimum X.
 * @param {number} minY Minimum Y.
 * @param {number} maxX Maximum X.
 * @param {number} maxY Maximum Y.
 * @param {ol.Extent=} opt_extent Destination extent.
 * @return {ol.Extent} Extent.
 */
ol.extent.createOrUpdate = function(minX, minY, maxX, maxY, opt_extent) {
  if (opt_extent) {
    opt_extent[0] = minX;
    opt_extent[1] = minY;
    opt_extent[2] = maxX;
    opt_extent[3] = maxY;
    return opt_extent;
  } else {
    return [minX, minY, maxX, maxY];
  }
};
 
 
/**
 * Create a new empty extent or make the provided one empty.
 * @param {ol.Extent=} opt_extent Extent.
 * @return {ol.Extent} Extent.
 */
ol.extent.createOrUpdateEmpty = function(opt_extent) {
  return ol.extent.createOrUpdate(
      Infinity, Infinity, -Infinity, -Infinity, opt_extent);
};
 
 
/**
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {ol.Extent=} opt_extent Extent.
 * @return {ol.Extent} Extent.
 */
ol.extent.createOrUpdateFromCoordinate = function(coordinate, opt_extent) {
  var x = coordinate[0];
  var y = coordinate[1];
  return ol.extent.createOrUpdate(x, y, x, y, opt_extent);
};
 
 
/**
 * @param {Array.<ol.Coordinate>} coordinates Coordinates.
 * @param {ol.Extent=} opt_extent Extent.
 * @return {ol.Extent} Extent.
 */
ol.extent.createOrUpdateFromCoordinates = function(coordinates, opt_extent) {
  var extent = ol.extent.createOrUpdateEmpty(opt_extent);
  return ol.extent.extendCoordinates(extent, coordinates);
};
 
 
/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {ol.Extent=} opt_extent Extent.
 * @return {ol.Extent} Extent.
 */
ol.extent.createOrUpdateFromFlatCoordinates =
    function(flatCoordinates, offset, end, stride, opt_extent) {
  var extent = ol.extent.createOrUpdateEmpty(opt_extent);
  return ol.extent.extendFlatCoordinates(
      extent, flatCoordinates, offset, end, stride);
};
 
 
/**
 * @param {Array.<Array.<ol.Coordinate>>} rings Rings.
 * @param {ol.Extent=} opt_extent Extent.
 * @return {ol.Extent} Extent.
 */
ol.extent.createOrUpdateFromRings = function(rings, opt_extent) {
  var extent = ol.extent.createOrUpdateEmpty(opt_extent);
  return ol.extent.extendRings(extent, rings);
};
 
 
/**
 * Empty an extent in place.
 * @param {ol.Extent} extent Extent.
 * @return {ol.Extent} Extent.
 */
ol.extent.empty = function(extent) {
  extent[0] = extent[1] = Infinity;
  extent[2] = extent[3] = -Infinity;
  return extent;
};
 
 
/**
 * Determine if two extents are equivalent.
 * @param {ol.Extent} extent1 Extent 1.
 * @param {ol.Extent} extent2 Extent 2.
 * @return {boolean} The two extents are equivalent.
 * @api stable
 */
ol.extent.equals = function(extent1, extent2) {
  return extent1[0] == extent2[0] && extent1[2] == extent2[2] &&
      extent1[1] == extent2[1] && extent1[3] == extent2[3];
};
 
 
/**
 * Modify an extent to include another extent.
 * @param {ol.Extent} extent1 The extent to be modified.
 * @param {ol.Extent} extent2 The extent that will be included in the first.
 * @return {ol.Extent} A reference to the first (extended) extent.
 * @api stable
 */
ol.extent.extend = function(extent1, extent2) {
  if (extent2[0] < extent1[0]) {
    extent1[0] = extent2[0];
  }
  if (extent2[2] > extent1[2]) {
    extent1[2] = extent2[2];
  }
  if (extent2[1] < extent1[1]) {
    extent1[1] = extent2[1];
  }
  if (extent2[3] > extent1[3]) {
    extent1[3] = extent2[3];
  }
  return extent1;
};
 
 
/**
 * @param {ol.Extent} extent Extent.
 * @param {ol.Coordinate} coordinate Coordinate.
 */
ol.extent.extendCoordinate = function(extent, coordinate) {
  if (coordinate[0] < extent[0]) {
    extent[0] = coordinate[0];
  }
  if (coordinate[0] > extent[2]) {
    extent[2] = coordinate[0];
  }
  if (coordinate[1] < extent[1]) {
    extent[1] = coordinate[1];
  }
  if (coordinate[1] > extent[3]) {
    extent[3] = coordinate[1];
  }
};
 
 
/**
 * @param {ol.Extent} extent Extent.
 * @param {Array.<ol.Coordinate>} coordinates Coordinates.
 * @return {ol.Extent} Extent.
 */
ol.extent.extendCoordinates = function(extent, coordinates) {
  var i, ii;
  for (i = 0, ii = coordinates.length; i < ii; ++i) {
    ol.extent.extendCoordinate(extent, coordinates[i]);
  }
  return extent;
};
 
 
/**
 * @param {ol.Extent} extent Extent.
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @return {ol.Extent} Extent.
 */
ol.extent.extendFlatCoordinates =
    function(extent, flatCoordinates, offset, end, stride) {
  for (; offset < end; offset += stride) {
    ol.extent.extendXY(
        extent, flatCoordinates[offset], flatCoordinates[offset + 1]);
  }
  return extent;
};
 
 
/**
 * @param {ol.Extent} extent Extent.
 * @param {Array.<Array.<ol.Coordinate>>} rings Rings.
 * @return {ol.Extent} Extent.
 */
ol.extent.extendRings = function(extent, rings) {
  var i, ii;
  for (i = 0, ii = rings.length; i < ii; ++i) {
    ol.extent.extendCoordinates(extent, rings[i]);
  }
  return extent;
};
 
 
/**
 * @param {ol.Extent} extent Extent.
 * @param {number} x X.
 * @param {number} y Y.
 */
ol.extent.extendXY = function(extent, x, y) {
  extent[0] = Math.min(extent[0], x);
  extent[1] = Math.min(extent[1], y);
  extent[2] = Math.max(extent[2], x);
  extent[3] = Math.max(extent[3], y);
};
 
 
/**
 * This function calls `callback` for each corner of the extent. If the
 * callback returns a truthy value the function returns that value
 * immediately. Otherwise the function returns `false`.
 * @param {ol.Extent} extent Extent.
 * @param {function(this:T, ol.Coordinate): S} callback Callback.
 * @param {T=} opt_this Value to use as `this` when executing `callback`.
 * @return {S|boolean} Value.
 * @template S, T
 */
ol.extent.forEachCorner = function(extent, callback, opt_this) {
  var val;
  val = callback.call(opt_this, ol.extent.getBottomLeft(extent));
  if (val) {
    return val;
  }
  val = callback.call(opt_this, ol.extent.getBottomRight(extent));
  if (val) {
    return val;
  }
  val = callback.call(opt_this, ol.extent.getTopRight(extent));
  if (val) {
    return val;
  }
  val = callback.call(opt_this, ol.extent.getTopLeft(extent));
  if (val) {
    return val;
  }
  return false;
};
 
 
/**
 * @param {ol.Extent} extent Extent.
 * @return {number} Area.
 */
ol.extent.getArea = function(extent) {
  var area = 0;
  if (!ol.extent.isEmpty(extent)) {
    area = ol.extent.getWidth(extent) * ol.extent.getHeight(extent);
  }
  return area;
};
 
 
/**
 * Get the bottom left coordinate of an extent.
 * @param {ol.Extent} extent Extent.
 * @return {ol.Coordinate} Bottom left coordinate.
 * @api stable
 */
ol.extent.getBottomLeft = function(extent) {
  return [extent[0], extent[1]];
};
 
 
/**
 * Get the bottom right coordinate of an extent.
 * @param {ol.Extent} extent Extent.
 * @return {ol.Coordinate} Bottom right coordinate.
 * @api stable
 */
ol.extent.getBottomRight = function(extent) {
  return [extent[2], extent[1]];
};
 
 
/**
 * Get the center coordinate of an extent.
 * @param {ol.Extent} extent Extent.
 * @return {ol.Coordinate} Center.
 * @api stable
 */
ol.extent.getCenter = function(extent) {
  return [(extent[0] + extent[2]) / 2, (extent[1] + extent[3]) / 2];
};
 
 
/**
 * Get a corner coordinate of an extent.
 * @param {ol.Extent} extent Extent.
 * @param {ol.extent.Corner} corner Corner.
 * @return {ol.Coordinate} Corner coordinate.
 */
ol.extent.getCorner = function(extent, corner) {
  var coordinate;
  if (corner === ol.extent.Corner.BOTTOM_LEFT) {
    coordinate = ol.extent.getBottomLeft(extent);
  } else if (corner === ol.extent.Corner.BOTTOM_RIGHT) {
    coordinate = ol.extent.getBottomRight(extent);
  } else if (corner === ol.extent.Corner.TOP_LEFT) {
    coordinate = ol.extent.getTopLeft(extent);
  } else if (corner === ol.extent.Corner.TOP_RIGHT) {
    coordinate = ol.extent.getTopRight(extent);
  } else {
    goog.asserts.fail('Invalid corner: %s', corner);
  }
  goog.asserts.assert(coordinate, 'coordinate should be defined');
  return coordinate;
};
 
 
/**
 * @param {ol.Extent} extent1 Extent 1.
 * @param {ol.Extent} extent2 Extent 2.
 * @return {number} Enlarged area.
 */
ol.extent.getEnlargedArea = function(extent1, extent2) {
  var minX = Math.min(extent1[0], extent2[0]);
  var minY = Math.min(extent1[1], extent2[1]);
  var maxX = Math.max(extent1[2], extent2[2]);
  var maxY = Math.max(extent1[3], extent2[3]);
  return (maxX - minX) * (maxY - minY);
};
 
 
/**
 * @param {ol.Coordinate} center Center.
 * @param {number} resolution Resolution.
 * @param {number} rotation Rotation.
 * @param {ol.Size} size Size.
 * @param {ol.Extent=} opt_extent Destination extent.
 * @return {ol.Extent} Extent.
 */
ol.extent.getForViewAndSize =
    function(center, resolution, rotation, size, opt_extent) {
  var dx = resolution * size[0] / 2;
  var dy = resolution * size[1] / 2;
  var cosRotation = Math.cos(rotation);
  var sinRotation = Math.sin(rotation);
  /** @type {Array.<number>} */
  var xs = [-dx, -dx, dx, dx];
  /** @type {Array.<number>} */
  var ys = [-dy, dy, -dy, dy];
  var i, x, y;
  for (i = 0; i < 4; ++i) {
    x = xs[i];
    y = ys[i];
    xs[i] = center[0] + x * cosRotation - y * sinRotation;
    ys[i] = center[1] + x * sinRotation + y * cosRotation;
  }
  return ol.extent.boundingExtentXYs_(xs, ys, opt_extent);
};
 
 
/**
 * Get the height of an extent.
 * @param {ol.Extent} extent Extent.
 * @return {number} Height.
 * @api stable
 */
ol.extent.getHeight = function(extent) {
  return extent[3] - extent[1];
};
 
 
/**
 * @param {ol.Extent} extent1 Extent 1.
 * @param {ol.Extent} extent2 Extent 2.
 * @return {number} Intersection area.
 */
ol.extent.getIntersectionArea = function(extent1, extent2) {
  var intersection = ol.extent.getIntersection(extent1, extent2);
  return ol.extent.getArea(intersection);
};
 
 
/**
 * Get the intersection of two extents.
 * @param {ol.Extent} extent1 Extent 1.
 * @param {ol.Extent} extent2 Extent 2.
 * @param {ol.Extent=} opt_extent Optional extent to populate with intersection.
 * @return {ol.Extent} Intersecting extent.
 * @api stable
 */
ol.extent.getIntersection = function(extent1, extent2, opt_extent) {
  var intersection = opt_extent ? opt_extent : ol.extent.createEmpty();
  if (ol.extent.intersects(extent1, extent2)) {
    if (extent1[0] > extent2[0]) {
      intersection[0] = extent1[0];
    } else {
      intersection[0] = extent2[0];
    }
    if (extent1[1] > extent2[1]) {
      intersection[1] = extent1[1];
    } else {
      intersection[1] = extent2[1];
    }
    if (extent1[2] < extent2[2]) {
      intersection[2] = extent1[2];
    } else {
      intersection[2] = extent2[2];
    }
    if (extent1[3] < extent2[3]) {
      intersection[3] = extent1[3];
    } else {
      intersection[3] = extent2[3];
    }
  }
  return intersection;
};
 
 
/**
 * @param {ol.Extent} extent Extent.
 * @return {number} Margin.
 */
ol.extent.getMargin = function(extent) {
  return ol.extent.getWidth(extent) + ol.extent.getHeight(extent);
};
 
 
/**
 * Get the size (width, height) of an extent.
 * @param {ol.Extent} extent The extent.
 * @return {ol.Size} The extent size.
 * @api stable
 */
ol.extent.getSize = function(extent) {
  return [extent[2] - extent[0], extent[3] - extent[1]];
};
 
 
/**
 * Get the top left coordinate of an extent.
 * @param {ol.Extent} extent Extent.
 * @return {ol.Coordinate} Top left coordinate.
 * @api stable
 */
ol.extent.getTopLeft = function(extent) {
  return [extent[0], extent[3]];
};
 
 
/**
 * Get the top right coordinate of an extent.
 * @param {ol.Extent} extent Extent.
 * @return {ol.Coordinate} Top right coordinate.
 * @api stable
 */
ol.extent.getTopRight = function(extent) {
  return [extent[2], extent[3]];
};
 
 
/**
 * Get the width of an extent.
 * @param {ol.Extent} extent Extent.
 * @return {number} Width.
 * @api stable
 */
ol.extent.getWidth = function(extent) {
  return extent[2] - extent[0];
};
 
 
/**
 * Determine if one extent intersects another.
 * @param {ol.Extent} extent1 Extent 1.
 * @param {ol.Extent} extent2 Extent.
 * @return {boolean} The two extents intersect.
 * @api stable
 */
ol.extent.intersects = function(extent1, extent2) {
  return extent1[0] <= extent2[2] &&
      extent1[2] >= extent2[0] &&
      extent1[1] <= extent2[3] &&
      extent1[3] >= extent2[1];
};
 
 
/**
 * Determine if an extent is empty.
 * @param {ol.Extent} extent Extent.
 * @return {boolean} Is empty.
 * @api stable
 */
ol.extent.isEmpty = function(extent) {
  return extent[2] < extent[0] || extent[3] < extent[1];
};
 
 
/**
 * @param {ol.Extent} extent Extent.
 * @return {boolean} Is infinite.
 */
ol.extent.isInfinite = function(extent) {
  return extent[0] == -Infinity || extent[1] == -Infinity ||
      extent[2] == Infinity || extent[3] == Infinity;
};
 
 
/**
 * @param {ol.Extent} extent Extent.
 * @param {ol.Coordinate} coordinate Coordinate.
 * @return {ol.Coordinate} Coordinate.
 */
ol.extent.normalize = function(extent, coordinate) {
  return [
    (coordinate[0] - extent[0]) / (extent[2] - extent[0]),
    (coordinate[1] - extent[1]) / (extent[3] - extent[1])
  ];
};
 
 
/**
 * @param {ol.Extent} extent Extent.
 * @param {ol.Extent=} opt_extent Extent.
 * @return {ol.Extent} Extent.
 */
ol.extent.returnOrUpdate = function(extent, opt_extent) {
  if (opt_extent) {
    opt_extent[0] = extent[0];
    opt_extent[1] = extent[1];
    opt_extent[2] = extent[2];
    opt_extent[3] = extent[3];
    return opt_extent;
  } else {
    return extent;
  }
};
 
 
/**
 * @param {ol.Extent} extent Extent.
 * @param {number} value Value.
 */
ol.extent.scaleFromCenter = function(extent, value) {
  var deltaX = ((extent[2] - extent[0]) / 2) * (value - 1);
  var deltaY = ((extent[3] - extent[1]) / 2) * (value - 1);
  extent[0] -= deltaX;
  extent[2] += deltaX;
  extent[1] -= deltaY;
  extent[3] += deltaY;
};
 
 
/**
 * Determine if the segment between two coordinates intersects (crosses,
 * touches, or is contained by) the provided extent.
 * @param {ol.Extent} extent The extent.
 * @param {ol.Coordinate} start Segment start coordinate.
 * @param {ol.Coordinate} end Segment end coordinate.
 * @return {boolean} The segment intersects the extent.
 */
ol.extent.intersectsSegment = function(extent, start, end) {
  var intersects = false;
  var startRel = ol.extent.coordinateRelationship(extent, start);
  var endRel = ol.extent.coordinateRelationship(extent, end);
  if (startRel === ol.extent.Relationship.INTERSECTING ||
      endRel === ol.extent.Relationship.INTERSECTING) {
    intersects = true;
  } else {
    var minX = extent[0];
    var minY = extent[1];
    var maxX = extent[2];
    var maxY = extent[3];
    var startX = start[0];
    var startY = start[1];
    var endX = end[0];
    var endY = end[1];
    var slope = (endY - startY) / (endX - startX);
    var x, y;
    if (!!(endRel & ol.extent.Relationship.ABOVE) &&
        !(startRel & ol.extent.Relationship.ABOVE)) {
      // potentially intersects top
      x = endX - ((endY - maxY) / slope);
      intersects = x >= minX && x <= maxX;
    }
    if (!intersects && !!(endRel & ol.extent.Relationship.RIGHT) &&
        !(startRel & ol.extent.Relationship.RIGHT)) {
      // potentially intersects right
      y = endY - ((endX - maxX) * slope);
      intersects = y >= minY && y <= maxY;
    }
    if (!intersects && !!(endRel & ol.extent.Relationship.BELOW) &&
        !(startRel & ol.extent.Relationship.BELOW)) {
      // potentially intersects bottom
      x = endX - ((endY - minY) / slope);
      intersects = x >= minX && x <= maxX;
    }
    if (!intersects && !!(endRel & ol.extent.Relationship.LEFT) &&
        !(startRel & ol.extent.Relationship.LEFT)) {
      // potentially intersects left
      y = endY - ((endX - minX) * slope);
      intersects = y >= minY && y <= maxY;
    }
 
  }
  return intersects;
};
 
 
/**
 * @param {ol.Extent} extent1 Extent 1.
 * @param {ol.Extent} extent2 Extent 2.
 * @return {boolean} Touches.
 */
ol.extent.touches = function(extent1, extent2) {
  var intersects = ol.extent.intersects(extent1, extent2);
  return intersects &&
      (extent1[0] == extent2[2] || extent1[2] == extent2[0] ||
       extent1[1] == extent2[3] || extent1[3] == extent2[1]);
};
 
 
/**
 * Apply a transform function to the extent.
 * @param {ol.Extent} extent Extent.
 * @param {ol.TransformFunction} transformFn Transform function.  Called with
 * [minX, minY, maxX, maxY] extent coordinates.
 * @param {ol.Extent=} opt_extent Destination extent.
 * @return {ol.Extent} Extent.
 * @api stable
 */
ol.extent.applyTransform = function(extent, transformFn, opt_extent) {
  var coordinates = [
    extent[0], extent[1],
    extent[0], extent[3],
    extent[2], extent[1],
    extent[2], extent[3]
  ];
  transformFn(coordinates, coordinates, 2);
  var xs = [coordinates[0], coordinates[2], coordinates[4], coordinates[6]];
  var ys = [coordinates[1], coordinates[3], coordinates[5], coordinates[7]];
  return ol.extent.boundingExtentXYs_(xs, ys, opt_extent);
};
 
 
/**
 * Apply a 2d transform to an extent.
 * @param {ol.Extent} extent Input extent.
 * @param {goog.vec.Mat4.Number} transform The transform matrix.
 * @param {ol.Extent=} opt_extent Optional extent for return values.
 * @return {ol.Extent} The transformed extent.
 */
ol.extent.transform2D = function(extent, transform, opt_extent) {
  var dest = opt_extent ? opt_extent : [];
  var m00 = goog.vec.Mat4.getElement(transform, 0, 0);
  var m10 = goog.vec.Mat4.getElement(transform, 1, 0);
  var m01 = goog.vec.Mat4.getElement(transform, 0, 1);
  var m11 = goog.vec.Mat4.getElement(transform, 1, 1);
  var m03 = goog.vec.Mat4.getElement(transform, 0, 3);
  var m13 = goog.vec.Mat4.getElement(transform, 1, 3);
  var xi = [0, 2, 0, 2];
  var yi = [1, 1, 3, 3];
  var xs = [];
  var ys = [];
  var i, x, y;
  for (i = 0; i < 4; ++i) {
    x = extent[xi[i]];
    y = extent[yi[i]];
    xs[i] = m00 * x + m01 * y + m03;
    ys[i] = m10 * x + m11 * y + m13;
  }
  dest[0] = Math.min.apply(null, xs);
  dest[1] = Math.min.apply(null, ys);
  dest[2] = Math.max.apply(null, xs);
  dest[3] = Math.max.apply(null, ys);
  return dest;
};