/usr/share/gtk-doc/html/grits/grits-roam.html is in libgrits-doc 0.8.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>roam</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.77.1">
<link rel="home" href="index.html" title="Grits Reference Manual">
<link rel="up" href="ch05.html" title="Utilities">
<link rel="prev" href="grits-gpqueue.html" title="gpqueue">
<link rel="next" href="ch06.html" title="Miscellaneous">
<meta name="generator" content="GTK-Doc V1.18 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2">
<tr valign="middle">
<td><a accesskey="p" href="grits-gpqueue.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td>
<td><a accesskey="u" href="ch05.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td>
<th width="100%" align="center">Grits Reference Manual</th>
<td><a accesskey="n" href="ch06.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td>
</tr>
<tr><td colspan="5" class="shortcuts">
<a href="#grits-roam.synopsis" class="shortcut">Top</a>
|
<a href="#grits-roam.description" class="shortcut">Description</a>
</td></tr>
</table>
<div class="refentry">
<a name="grits-roam"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="grits-roam.top_of_page"></a>roam</span></h2>
<p>roam — Realtime Optimally-Adapting Meshes</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="grits-roam.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">struct <a class="link" href="grits-roam.html#RoamDiamond" title="struct RoamDiamond">RoamDiamond</a>;
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> (<a class="link" href="grits-roam.html#RoamHeightFunc" title="RoamHeightFunc ()">*RoamHeightFunc</a>) (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lat</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lon</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
struct <a class="link" href="grits-roam.html#RoamPoint" title="struct RoamPoint">RoamPoint</a>;
struct <a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere">RoamSphere</a>;
struct <a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle">RoamTriangle</a>;
struct <a class="link" href="grits-roam.html#RoamView" title="struct RoamView">RoamView</a>;
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-diamond-add" title="roam_diamond_add ()">roam_diamond_add</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamDiamond" title="struct RoamDiamond"><span class="type">RoamDiamond</span></a> *diamond</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-diamond-merge" title="roam_diamond_merge ()">roam_diamond_merge</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamDiamond" title="struct RoamDiamond"><span class="type">RoamDiamond</span></a> *diamond</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);
<a class="link" href="grits-roam.html#RoamDiamond" title="struct RoamDiamond"><span class="returnvalue">RoamDiamond</span></a> * <a class="link" href="grits-roam.html#roam-diamond-new" title="roam_diamond_new ()">roam_diamond_new</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *parent0</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *parent1</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-diamond-remove" title="roam_diamond_remove ()">roam_diamond_remove</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamDiamond" title="struct RoamDiamond"><span class="type">RoamDiamond</span></a> *diamond</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-diamond-update-errors" title="roam_diamond_update_errors ()">roam_diamond_update_errors</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamDiamond" title="struct RoamDiamond"><span class="type">RoamDiamond</span></a> *diamond</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-point-add-triangle" title="roam_point_add_triangle ()">roam_point_add_triangle</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamPoint" title="struct RoamPoint"><span class="type">RoamPoint</span></a> *point</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *triangle</code></em>);
<a class="link" href="grits-roam.html#RoamPoint" title="struct RoamPoint"><span class="returnvalue">RoamPoint</span></a> * <a class="link" href="grits-roam.html#roam-point-new" title="roam_point_new ()">roam_point_new</a> (<em class="parameter"><code><span class="type">double</span> lat</code></em>,
<em class="parameter"><code><span class="type">double</span> lon</code></em>,
<em class="parameter"><code><span class="type">double</span> elev</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-point-remove-triangle" title="roam_point_remove_triangle ()">roam_point_remove_triangle</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamPoint" title="struct RoamPoint"><span class="type">RoamPoint</span></a> *point</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *triangle</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-point-update-height" title="roam_point_update_height ()">roam_point_update_height</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamPoint" title="struct RoamPoint"><span class="type">RoamPoint</span></a> *point</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-point-update-projection" title="roam_point_update_projection ()">roam_point_update_projection</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamPoint" title="struct RoamPoint"><span class="type">RoamPoint</span></a> *point</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamView" title="struct RoamView"><span class="type">RoamView</span></a> *view</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-sphere-draw" title="roam_sphere_draw ()">roam_sphere_draw</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-sphere-draw-normals" title="roam_sphere_draw_normals ()">roam_sphere_draw_normals</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-sphere-free" title="roam_sphere_free ()">roam_sphere_free</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> * <a class="link" href="grits-roam.html#roam-sphere-get-intersect" title="roam_sphere_get_intersect ()">roam_sphere_get_intersect</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> all</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> n</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> s</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> e</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> w</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-sphere-merge-one" title="roam_sphere_merge_one ()">roam_sphere_merge_one</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);
<a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="returnvalue">RoamSphere</span></a> * <a class="link" href="grits-roam.html#roam-sphere-new" title="roam_sphere_new ()">roam_sphere_new</a> ();
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> <a class="link" href="grits-roam.html#roam-sphere-split-merge" title="roam_sphere_split_merge ()">roam_sphere_split_merge</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-sphere-split-one" title="roam_sphere_split_one ()">roam_sphere_split_one</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-sphere-update-errors" title="roam_sphere_update_errors ()">roam_sphere_update_errors</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-sphere-update-view" title="roam_sphere_update_view ()">roam_sphere_update_view</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-triangle-add" title="roam_triangle_add ()">roam_triangle_add</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *triangle</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *left</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *base</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *right</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-triangle-draw" title="roam_triangle_draw ()">roam_triangle_draw</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *triangle</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-triangle-draw-normal" title="roam_triangle_draw_normal ()">roam_triangle_draw_normal</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *triangle</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-triangle-free" title="roam_triangle_free ()">roam_triangle_free</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *triangle</code></em>);
<a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="returnvalue">RoamTriangle</span></a> * <a class="link" href="grits-roam.html#roam-triangle-new" title="roam_triangle_new ()">roam_triangle_new</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamPoint" title="struct RoamPoint"><span class="type">RoamPoint</span></a> *l</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamPoint" title="struct RoamPoint"><span class="type">RoamPoint</span></a> *m</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamPoint" title="struct RoamPoint"><span class="type">RoamPoint</span></a> *r</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamDiamond" title="struct RoamDiamond"><span class="type">RoamDiamond</span></a> *parent</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-triangle-remove" title="roam_triangle_remove ()">roam_triangle_remove</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *triangle</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-triangle-split" title="roam_triangle_split ()">roam_triangle_split</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *triangle</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);
<span class="returnvalue">void</span> <a class="link" href="grits-roam.html#roam-triangle-update-errors" title="roam_triangle_update_errors ()">roam_triangle_update_errors</a> (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *triangle</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="grits-roam.description"></a><h2>Description</h2>
<p>
A spherical version of the Realtime Optimally-Adapting Meshes (ROAM)
algorithm is use for drawing the surface of the planet. ROAM provide a
continuous level-of-detail mesh of the planet which is used by <a class="link" href="GritsOpenGL.html" title="GritsOpenGL"><span class="type">GritsOpenGL</span></a>
when drawing surface textures for GritsTiles.
</p>
<p>
This implementation of the ROAM algorithm is based on an octahedron as the
base model.
</p>
</div>
<div class="refsect1">
<a name="grits-roam.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="RoamDiamond"></a><h3>struct RoamDiamond</h3>
<pre class="programlisting">struct RoamDiamond {
};
</pre>
<p>
When two adjacent triangles are split, they, along with the four new child
triangles, are added to a diamond which keeps track of them.
</p>
<p>
Like triangles, diamond have an error associated with it. However, when a
diamonds error is small enough it is "merged". That is, the diamond along
with the child triangles is removed and the original two triangles triangles
are added back into the mesh.
</p>
</div>
<hr>
<div class="refsect2">
<a name="RoamHeightFunc"></a><h3>RoamHeightFunc ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> (*RoamHeightFunc) (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lat</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lon</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
See <a class="link" href="GritsViewer.html#GritsHeightFunc" title="GritsHeightFunc ()"><span class="type">GritsHeightFunc</span></a>
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>lat</code></em> :</span></p></td>
<td>the latitude</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lon</code></em> :</span></p></td>
<td>the longitude</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data passed to the function</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the elevation</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="RoamPoint"></a><h3>struct RoamPoint</h3>
<pre class="programlisting">struct RoamPoint {
};
</pre>
<p>
Points are used as vertices for triangles. A single point my be shared among
several triangles in order to conceive space and avoid recalculating
projections. Points also store a lot of cached data. The normal vertex normal
is the averaged surface normal of each associated triangle.
</p>
</div>
<hr>
<div class="refsect2">
<a name="RoamSphere"></a><h3>struct RoamSphere</h3>
<pre class="programlisting">struct RoamSphere {
};
</pre>
<p>
The sphere keeps track of the triangles and diamonds in the mesh.
</p>
<p>
Originally the sphere consists of only 8 triangles forming a octahedron.
These triangles are quickly split to create a smoother sphere.
</p>
</div>
<hr>
<div class="refsect2">
<a name="RoamTriangle"></a><h3>struct RoamTriangle</h3>
<pre class="programlisting">struct RoamTriangle {
};
</pre>
<p>
Triangles are one of the key datatypes in ROAM. The surface is made up of
triangles. Each triangle has an associated "error". When the surface is being
updated after the view changes, each triangles error is updated. Afterwards
the triangles with the most error are split int to triangles, each with a
lower error than the original.
</p>
<p>
Triangles store a lot of data about their location in the mesh so that they
can be split and merged (unsplit) without having to recreate the mesh.
</p>
</div>
<hr>
<div class="refsect2">
<a name="RoamView"></a><h3>struct RoamView</h3>
<pre class="programlisting">struct RoamView {
gdouble model[16];
gdouble proj[16];
gint view[4];
gint version;
};
</pre>
<p>
Stores projection matrices
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> <em class="structfield"><code><a name="RoamView.model"></a>model</code></em>[16];</span></p></td>
<td>model view matrix</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> <em class="structfield"><code><a name="RoamView.proj"></a>proj</code></em>[16];</span></p></td>
<td>projection matrix</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="RoamView.view"></a>view</code></em>[4];</span></p></td>
<td>viewport matrix</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="RoamView.version"></a>version</code></em>;</span></p></td>
<td>version</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-diamond-add"></a><h3>roam_diamond_add ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_diamond_add (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamDiamond" title="struct RoamDiamond"><span class="type">RoamDiamond</span></a> *diamond</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);</pre>
<p>
Add a diamond into the sphere's pool of diamonds. It will be check for
possible merges.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>diamond</code></em> :</span></p></td>
<td>the diamond</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sphere</code></em> :</span></p></td>
<td>the sphere to add the diamond to</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-diamond-merge"></a><h3>roam_diamond_merge ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_diamond_merge (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamDiamond" title="struct RoamDiamond"><span class="type">RoamDiamond</span></a> *diamond</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);</pre>
<p>
"Merge" a diamond back into two parent triangles. The original two triangles
are added back into the sphere and the four child triangles as well as the
diamond are removed.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>diamond</code></em> :</span></p></td>
<td>the diamond</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sphere</code></em> :</span></p></td>
<td>the sphere</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-diamond-new"></a><h3>roam_diamond_new ()</h3>
<pre class="programlisting"><a class="link" href="grits-roam.html#RoamDiamond" title="struct RoamDiamond"><span class="returnvalue">RoamDiamond</span></a> * roam_diamond_new (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *parent0</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *parent1</code></em>);</pre>
<p>
Create a diamond to store information about two split triangles.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent0</code></em> :</span></p></td>
<td>a parent triangle</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parent1</code></em> :</span></p></td>
<td>a parent triangle</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new diamond</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-diamond-remove"></a><h3>roam_diamond_remove ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_diamond_remove (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamDiamond" title="struct RoamDiamond"><span class="type">RoamDiamond</span></a> *diamond</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);</pre>
<p>
Remove a diamond from the sphere's pool of diamonds.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>diamond</code></em> :</span></p></td>
<td>the diamond</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sphere</code></em> :</span></p></td>
<td>the sphere to remove the diamond from</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-diamond-update-errors"></a><h3>roam_diamond_update_errors ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_diamond_update_errors (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamDiamond" title="struct RoamDiamond"><span class="type">RoamDiamond</span></a> *diamond</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);</pre>
<p>
Update the error value associated with a diamond. Called when the view
changes.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>diamond</code></em> :</span></p></td>
<td>the diamond</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sphere</code></em> :</span></p></td>
<td>the sphere to use when updating errors</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-point-add-triangle"></a><h3>roam_point_add_triangle ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_point_add_triangle (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamPoint" title="struct RoamPoint"><span class="type">RoamPoint</span></a> *point</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *triangle</code></em>);</pre>
<p>
Associating a triangle with a point and update it's vertex normal.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>point</code></em> :</span></p></td>
<td>the point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>triangle</code></em> :</span></p></td>
<td>the to add</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-point-new"></a><h3>roam_point_new ()</h3>
<pre class="programlisting"><a class="link" href="grits-roam.html#RoamPoint" title="struct RoamPoint"><span class="returnvalue">RoamPoint</span></a> * roam_point_new (<em class="parameter"><code><span class="type">double</span> lat</code></em>,
<em class="parameter"><code><span class="type">double</span> lon</code></em>,
<em class="parameter"><code><span class="type">double</span> elev</code></em>);</pre>
<p>
Create a new point at the given locaiton
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>lat</code></em> :</span></p></td>
<td>the latitude for the point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lon</code></em> :</span></p></td>
<td>the longitude for the point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>elev</code></em> :</span></p></td>
<td>the elevation for the point</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new point</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-point-remove-triangle"></a><h3>roam_point_remove_triangle ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_point_remove_triangle (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamPoint" title="struct RoamPoint"><span class="type">RoamPoint</span></a> *point</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *triangle</code></em>);</pre>
<p>
Un-associating a triangle with a point and update it's vertex normal.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>point</code></em> :</span></p></td>
<td>the point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>triangle</code></em> :</span></p></td>
<td>the to add</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-point-update-height"></a><h3>roam_point_update_height ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_point_update_height (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamPoint" title="struct RoamPoint"><span class="type">RoamPoint</span></a> *point</code></em>);</pre>
<p>
Update the height (elevation) of a point based on the current height function
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>point</code></em> :</span></p></td>
<td>the point</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-point-update-projection"></a><h3>roam_point_update_projection ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_point_update_projection (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamPoint" title="struct RoamPoint"><span class="type">RoamPoint</span></a> *point</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamView" title="struct RoamView"><span class="type">RoamView</span></a> *view</code></em>);</pre>
<p>
Updated the screen-space projection of a point.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>point</code></em> :</span></p></td>
<td>the point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>view</code></em> :</span></p></td>
<td>the view to use when projecting the point</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-sphere-draw"></a><h3>roam_sphere_draw ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_sphere_draw (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);</pre>
<p>
Draw the sphere. Use for debugging.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>sphere</code></em> :</span></p></td>
<td>the sphere</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-sphere-draw-normals"></a><h3>roam_sphere_draw_normals ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_sphere_draw_normals (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);</pre>
<p>
Draw all the surface normal vectors for the sphere. Used while debugging.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>sphere</code></em> :</span></p></td>
<td>the sphere</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-sphere-free"></a><h3>roam_sphere_free ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_sphere_free (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);</pre>
<p>
Free data associated with a sphere
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>sphere</code></em> :</span></p></td>
<td>the sphere</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-sphere-get-intersect"></a><h3>roam_sphere_get_intersect ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> * roam_sphere_get_intersect (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> all</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> n</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> s</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> e</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> w</code></em>);</pre>
<p>
Lookup triangles withing the sphere that intersect a given lat-lon box.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>sphere</code></em> :</span></p></td>
<td>the sphere</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>all</code></em> :</span></p></td>
<td>TRUE if non-leaf triangle should be returned as well</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>n</code></em> :</span></p></td>
<td>the northern edge</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>s</code></em> :</span></p></td>
<td>the southern edge</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>e</code></em> :</span></p></td>
<td>the eastern edge</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>w</code></em> :</span></p></td>
<td>the western edge</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the list of intersecting triangles.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-sphere-merge-one"></a><h3>roam_sphere_merge_one ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_sphere_merge_one (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);</pre>
<p>
Merge the diamond with the lowest error.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>sphere</code></em> :</span></p></td>
<td>the sphere</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-sphere-new"></a><h3>roam_sphere_new ()</h3>
<pre class="programlisting"><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="returnvalue">RoamSphere</span></a> * roam_sphere_new ();</pre>
<p>
Create a new sphere
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the sphere</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-sphere-split-merge"></a><h3>roam_sphere_split_merge ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> roam_sphere_split_merge (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);</pre>
<p>
Perform a predetermined number split-merge iterations.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>sphere</code></em> :</span></p></td>
<td>the sphere</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the number splits and merges done</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-sphere-split-one"></a><h3>roam_sphere_split_one ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_sphere_split_one (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);</pre>
<p>
Split the triangle with the greatest error.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>sphere</code></em> :</span></p></td>
<td>the sphere</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-sphere-update-errors"></a><h3>roam_sphere_update_errors ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_sphere_update_errors (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);</pre>
<p>
Update triangle and diamond errors in the sphere.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>sphere</code></em> :</span></p></td>
<td>the sphere</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-sphere-update-view"></a><h3>roam_sphere_update_view ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_sphere_update_view (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);</pre>
<p>
Recreate the sphere's view matrices based on the current OpenGL state.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>sphere</code></em> :</span></p></td>
<td>the sphere</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-triangle-add"></a><h3>roam_triangle_add ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_triangle_add (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *triangle</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *left</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *base</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *right</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);</pre>
<p>
Add a triangle into the sphere's mesh using the given neighbors.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>triangle</code></em> :</span></p></td>
<td>the triangle</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>left</code></em> :</span></p></td>
<td>the left neighbor</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>base</code></em> :</span></p></td>
<td>the base neighbor</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>right</code></em> :</span></p></td>
<td>the right neighbor</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sphere</code></em> :</span></p></td>
<td>the sphere to add the triangle to</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-triangle-draw"></a><h3>roam_triangle_draw ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_triangle_draw (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *triangle</code></em>);</pre>
<p>
Draw the triangle. Use for debugging.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>triangle</code></em> :</span></p></td>
<td>the triangle</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-triangle-draw-normal"></a><h3>roam_triangle_draw_normal ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_triangle_draw_normal (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *triangle</code></em>);</pre>
<p>
Draw a normal vector for the triangle. Used while debugging.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>triangle</code></em> :</span></p></td>
<td>the triangle</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-triangle-free"></a><h3>roam_triangle_free ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_triangle_free (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *triangle</code></em>);</pre>
<p>
Free data associated with a triangle
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>triangle</code></em> :</span></p></td>
<td>the triangle</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-triangle-new"></a><h3>roam_triangle_new ()</h3>
<pre class="programlisting"><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="returnvalue">RoamTriangle</span></a> * roam_triangle_new (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamPoint" title="struct RoamPoint"><span class="type">RoamPoint</span></a> *l</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamPoint" title="struct RoamPoint"><span class="type">RoamPoint</span></a> *m</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamPoint" title="struct RoamPoint"><span class="type">RoamPoint</span></a> *r</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamDiamond" title="struct RoamDiamond"><span class="type">RoamDiamond</span></a> *parent</code></em>);</pre>
<p>
Create a new triangle consisting of three points.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>l</code></em> :</span></p></td>
<td>the left point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>m</code></em> :</span></p></td>
<td>the middle point</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>r</code></em> :</span></p></td>
<td>the right point</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new triangle</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-triangle-remove"></a><h3>roam_triangle_remove ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_triangle_remove (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *triangle</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);</pre>
<p>
Remove a triangle from a sphere's mesh.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>triangle</code></em> :</span></p></td>
<td>the triangle</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sphere</code></em> :</span></p></td>
<td>the sphere to remove the triangle from</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-triangle-split"></a><h3>roam_triangle_split ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_triangle_split (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *triangle</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);</pre>
<p>
Split a triangle into two child triangles and update the sphere.
triangle
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>triangle</code></em> :</span></p></td>
<td>the triangle</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sphere</code></em> :</span></p></td>
<td>the sphere</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="roam-triangle-update-errors"></a><h3>roam_triangle_update_errors ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> roam_triangle_update_errors (<em class="parameter"><code><a class="link" href="grits-roam.html#RoamTriangle" title="struct RoamTriangle"><span class="type">RoamTriangle</span></a> *triangle</code></em>,
<em class="parameter"><code><a class="link" href="grits-roam.html#RoamSphere" title="struct RoamSphere"><span class="type">RoamSphere</span></a> *sphere</code></em>);</pre>
<p>
Update the error value associated with a triangle. Called when the view
changes.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>triangle</code></em> :</span></p></td>
<td>the triangle</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sphere</code></em> :</span></p></td>
<td>the sphere to use when updating errors</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="footer">
<hr>
Generated by GTK-Doc V1.18</div>
</body>
</html>
|