adg/adg-adim.c

   1 /* ADG - Automatic Drawing Generation
   2  * Copyright (C) 2007,2008,2009 Nicola Fontana <ntd at entidi.it>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA  02110-1301, USA.
  18  */
  19
  20
  21 /**
  22  * SECTION:adg-adim
  23  * @short_description: Angular dimensions
  24  *
  25  * The #AdgADim entity defines an angular dimension.
  26  */
  27
  28 /**
  29  * AdgADim:
  30  *
  31  * All fields are privates and should not be used directly.
  32  * Use its public methods instead.
  33  **/
  34
  35
  36 #include "adg-internal.h"
  37 #include "adg-adim.h"
  38 #include "adg-adim-private.h"
  39 #include "adg-dim-private.h"
  40
  41 #define PARENT_OBJECT_CLASS  ((GObjectClass *) adg_adim_parent_class)
  42 #define PARENT_ENTITY_CLASS  ((AdgEntityClass *) adg_adim_parent_class)
  43
  44
  45 enum {
  46     PROP_0,
  47     PROP_ORG1,
  48     PROP_ORG2,
  49     PROP_HAS_EXTENSION1,
  50     PROP_HAS_EXTENSION2
  51 };
  52
  53
  54 static void             dispose                 (GObject        *object);
  55 static void             get_property            (GObject        *object,
  56                                                  guint           param_id,
  57                                                  GValue         *value,
  58                                                  GParamSpec     *pspec);
  59 static void             set_property            (GObject        *object,
  60                                                  guint           param_id,
  61                                                  const GValue   *value,
  62                                                  GParamSpec     *pspec);
  63 static void             local_changed           (AdgEntity      *entity);
  64 static void             invalidate              (AdgEntity      *entity);
  65 static void             arrange                 (AdgEntity      *entity);
  66 static void             render                  (AdgEntity      *entity,
  67                                                  cairo_t        *cr);
  68 static gchar *          default_value           (AdgDim         *dim);
  69 static void             update_geometry         (AdgADim        *adim);
  70 static void             update_entities         (AdgADim        *adim);
  71 static void             unset_trail             (AdgADim        *adim);
  72 static void             dispose_markers         (AdgADim        *adim);
  73 static gboolean         get_info                (AdgADim        *adim,
  74                                                  CpmlVector      vector[],
  75                                                  AdgPair        *center,
  76                                                  gdouble        *distance);
  77 static CpmlPath *       trail_callback          (AdgTrail       *trail,
  78                                                  gpointer        user_data);
  79
  80
  81 G_DEFINE_TYPE(AdgADim, adg_adim, ADG_TYPE_DIM);
  82
  83
  84 static void
  85 adg_adim_class_init(AdgADimClass *klass)
  86 {
  87     GObjectClass *gobject_class;
  88     AdgEntityClass *entity_class;
  89     AdgDimClass *dim_class;
  90     GParamSpec *param;
  91
  92     gobject_class = (GObjectClass *) klass;
  93     entity_class = (AdgEntityClass *) klass;
  94     dim_class = (AdgDimClass *) klass;
  95
  96     g_type_class_add_private(klass, sizeof(AdgADimPrivate));
  97
  98     gobject_class->dispose = dispose;
  99     gobject_class->get_property = get_property;
 100     gobject_class->set_property = set_property;
 101
 102     entity_class->local_changed = local_changed;
 103     entity_class->invalidate = invalidate;
 104     entity_class->arrange = arrange;
 105     entity_class->render = render;
 106
 107     dim_class->default_value = default_value;
 108
 109     param = g_param_spec_boxed("org1",
 110                                P_("First Origin"),
 111                                P_("Where the first line comes from: this point is used toghether with \"ref1\" to align the first extension line"),
 112                                ADG_TYPE_POINT,
 113                                G_PARAM_READWRITE);
 114     g_object_class_install_property(gobject_class, PROP_ORG1, param);
 115
 116     param = g_param_spec_boxed("org2",
 117                                P_("Second Origin"),
 118                                P_("Where the second line comes from: this point is used toghether with \"ref2\" to align the second extension line"),
 119                                ADG_TYPE_POINT,
 120                                G_PARAM_READWRITE);
 121     g_object_class_install_property(gobject_class, PROP_ORG2, param);
 122 }
 123
 124 static void
 125 adg_adim_init(AdgADim *adim)
 126 {
 127     AdgADimPrivate *data;
 128     cairo_path_data_t move_to, line_to, arc_to;
 129
 130     data = G_TYPE_INSTANCE_GET_PRIVATE(adim, ADG_TYPE_ADIM, AdgADimPrivate);
 131     move_to.header.type = CPML_MOVE;
 132     move_to.header.length = 2;
 133     line_to.header.type = CPML_LINE;
 134     line_to.header.length = 2;
 135     arc_to.header.type = CPML_ARC;
 136     arc_to.header.length = 3;
 137
 138     data->org1 = NULL;
 139     data->org2 = NULL;
 140     data->has_extension1 = TRUE;
 141     data->has_extension2 = TRUE;
 142
 143     data->cpml.path.status = CAIRO_STATUS_INVALID_PATH_DATA;
 144     data->cpml.path.data = data->cpml.data;
 145     data->cpml.path.num_data = G_N_ELEMENTS(data->cpml.data);
 146     data->cpml.path.data[0] = move_to;
 147     data->cpml.path.data[2] = arc_to;
 148     data->cpml.path.data[5] = move_to;
 149     data->cpml.path.data[7] = line_to;
 150     data->cpml.path.data[9] = move_to;
 151     data->cpml.path.data[11] = line_to;
 152
 153     data->trail = NULL;
 154     data->marker1 = NULL;
 155     data->marker2 = NULL;
 156
 157     data->geometry_arranged = FALSE;
 158
 159     adim->data = data;
 160 }
 161
 162 static void
 163 dispose(GObject *object)
 164 {
 165     AdgADim *adim;
 166     AdgADimPrivate *data;
 167
 168     adim = (AdgADim *) object;
 169     data = adim->data;
 170
 171     dispose_markers((AdgADim *) object);
 172
 173     if (data->org1 != NULL) {
 174         adg_point_destroy(data->org1);
 175         data->org1 = NULL;
 176     }
 177     if (data->org2 != NULL) {
 178         adg_point_destroy(data->org2);
 179         data->org2 = NULL;
 180     }
 181
 182     if (PARENT_OBJECT_CLASS->dispose)
 183         PARENT_OBJECT_CLASS->dispose(object);
 184 }
 185
 186 static void
 187 get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
 188 {
 189     AdgADimPrivate *data = ((AdgADim *) object)->data;
 190
 191     switch (prop_id) {
 192     case PROP_ORG1:
 193         g_value_set_boxed(value, &data->org1);
 194         break;
 195     case PROP_ORG2:
 196         g_value_set_boxed(value, &data->org2);
 197         break;
 198     case PROP_HAS_EXTENSION1:
 199         g_value_set_boolean(value, data->has_extension1);
 200         break;
 201     case PROP_HAS_EXTENSION2:
 202         g_value_set_boolean(value, data->has_extension2);
 203         break;
 204     default:
 205         G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
 206         break;
 207     }
 208 }
 209
 210 static void
 211 set_property(GObject *object, guint prop_id,
 212              const GValue *value, GParamSpec *pspec)
 213 {
 214     AdgADim *adim;
 215     AdgADimPrivate *data;
 216
 217     adim = (AdgADim *) object;
 218     data = adim->data;
 219
 220     switch (prop_id) {
 221     case PROP_ORG1:
 222         if (data->org1 != NULL)
 223             adg_point_destroy(data->org1);
 224         data->org1 = g_value_dup_boxed(value);
 225         break;
 226     case PROP_ORG2:
 227         if (data->org2 != NULL)
 228             adg_point_destroy(data->org2);
 229         data->org2 = g_value_dup_boxed(value);
 230         break;
 231     case PROP_HAS_EXTENSION1:
 232         data->has_extension1 = g_value_get_boolean(value);
 233         break;
 234     case PROP_HAS_EXTENSION2:
 235         data->has_extension2 = g_value_get_boolean(value);
 236         break;
 237     default:
 238         G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
 239         break;
 240     }
 241 }
 242
 243
 244 /**
 245  * adg_adim_new:
 246  *
 247  * Creates a new - undefined - angular dimension. You must, at least,
 248  * define the reference points with adg_dim_set_ref(), the origins of
 249  * the lines ending with the reference points with adg_adim_set_org()
 250  * and the reference for positioning the quote with adg_dim_set_pos().
 251  *
 252  * Returns: the newly created angular dimension entity
 253  **/
 254 AdgADim *
 255 adg_adim_new(void)
 256 {
 257     return g_object_new(ADG_TYPE_ADIM, NULL);
 258 }
 259
 260 /**
 261  * adg_adim_new_full:
 262  * @ref1: first reference point
 263  * @ref2: second reference point
 264  * @org1: first origin point
 265  * @org2: second origin point
 266  *
 267  * Creates a new angular dimension, specifing all the needed
 268  * properties in one shot.
 269  *
 270  * Returns: the newly created angular dimension entity
 271  **/
 272 AdgADim *
 273 adg_adim_new_full(const AdgPair *ref1, const AdgPair *ref2,
 274                   const AdgPair *org1, const AdgPair *org2,
 275                   const AdgPair *pos)
 276 {
 277     AdgADim *adim;
 278     AdgDim *dim;
 279
 280     adim = g_object_new(ADG_TYPE_ADIM, NULL);
 281     dim = (AdgDim *) adim;
 282
 283     adg_dim_set_ref(dim, ref1, ref2);
 284     adg_adim_set_org(adim, org1, org2);
 285     adg_dim_set_pos(dim, pos);
 286
 287     return adim;
 288 }
 289
 290 /**
 291  * adg_adim_new_full_explicit:
 292  * @ref1_x: the x coordinate of the first reference point
 293  * @ref1_y: the y coordinate of the first reference point
 294  * @ref2_x: the x coordinate of the second reference point
 295  * @ref2_y: the y coordinate of the second reference point
 296  * @direction: angle where to extend the dimension
 297  * @pos_x: the x coordinate of the position reference
 298  * @pos_y: the y coordinate of the position reference
 299  *
 300  * Wrappes adg_adim_new_full() with explicit values.
 301  *
 302  * Returns: the newly created linear dimension entity
 303  **/
 304 AdgADim *
 305 adg_adim_new_full_explicit(gdouble ref1_x, gdouble ref1_y,
 306                            gdouble ref2_x, gdouble ref2_y,
 307                            gdouble org1_x, gdouble org1_y,
 308                            gdouble org2_x, gdouble org2_y,
 309                            gdouble pos_x,  gdouble pos_y)
 310 {
 311     AdgPair ref1, ref2, org1, org2, pos;
 312
 313     ref1.x = ref1_x;
 314     ref1.y = ref1_y;
 315     ref2.x = ref2_x;
 316     ref2.y = ref2_y;
 317     org1.x = org1_x;
 318     org1.y = org1_y;
 319     org2.x = org2_x;
 320     org2.y = org2_y;
 321     pos.x = pos_x;
 322     pos.y = pos_y;
 323
 324     return adg_adim_new_full(&ref1, &ref2, &org1, &org2, &pos);
 325 }
 326
 327 /**
 328  * adg_adim_new_full_from_model:
 329  * @model: the model from which the named pairs are taken
 330  * @ref1: the end point of the first line
 331  * @ref2: the end point of the second line
 332  * @org1: the origin of the first line
 333  * @org2: the origin of the second line
 334  * @pos: the position reference
 335  *
 336  * Creates a new angular dimension, specifing all the needed properties
 337  * in one shot and using named pairs from @model.
 338  *
 339  * Returns: the newly created angular dimension entity
 340  **/
 341 AdgADim *
 342 adg_adim_new_full_from_model(AdgModel *model,
 343                              const gchar *ref1, const gchar *ref2,
 344                              const gchar *org1, const gchar *org2,
 345                              const gchar *pos)
 346 {
 347     AdgADim *adim;
 348     AdgDim *dim;
 349
 350     adim = g_object_new(ADG_TYPE_ADIM, NULL);
 351     dim = (AdgDim *) adim;
 352
 353     adg_dim_set_ref_from_model(dim, model, ref1, ref2);
 354     adg_dim_set_pos_from_model(dim, model, pos);
 355     adg_adim_set_org_from_model(adim, model, org1, org2);
 356
 357     return adim;
 358 }
 359
 360 /**
 361  * adg_adim_set_org:
 362  * @adim: an #AdgADim
 363  * @org1: the first origin
 364  * @org2: the second origin
 365  *
 366  * Sets at once the two origins on @adim. One of @org1 or @org2
 367  * (but not both) could be %NULL, in which case only the non-null
 368  * origin is set.
 369  **/
 370 void
 371 adg_adim_set_org(AdgADim *adim, const AdgPair *org1, const AdgPair *org2)
 372 {
 373     GObject *object;
 374     AdgADimPrivate *data;
 375
 376     g_return_if_fail(ADG_IS_ADIM(adim));
 377     g_return_if_fail(org1 != NULL || org2 != NULL);
 378
 379     object = (GObject *) adim;
 380     data = adim->data;
 381
 382     g_object_freeze_notify(object);
 383
 384     if (org1 != NULL) {
 385         if (data->org1 == NULL)
 386             data->org1 = adg_point_new();
 387
 388         adg_point_set_pair(data->org1, org1);
 389
 390         g_object_notify(object, "org1");
 391     }
 392
 393     if (org2 != NULL) {
 394         if (data->org2 == NULL)
 395             data->org2 = adg_point_new();
 396
 397         adg_point_set_pair(data->org2, org2);
 398
 399         g_object_notify(object, "org2");
 400     }
 401
 402     g_object_thaw_notify(object);
 403 }
 404
 405 /**
 406  * adg_adim_set_org_explicit:
 407  * @adim: an #AdgADim
 408  * @org1_x: x coordinate of org1
 409  * @org1_y: y coordinate of org1
 410  * @org2_x: x coordinate of org2
 411  * @org2_y: y coordinate of org2
 412  *
 413  * Works in the same way as adg_adim_set_org() but using
 414  * explicit coordinates instead of #AdgPair args. The
 415  * notable difference is that, by using gdouble values,
 416  * you can't set only a single origin point.
 417  **/
 418 void
 419 adg_adim_set_org_explicit(AdgADim *adim,
 420                           gdouble org1_x, gdouble org1_y,
 421                           gdouble org2_x, gdouble org2_y)
 422 {
 423     AdgPair org1, org2;
 424
 425     org1.x = org1_x;
 426     org1.y = org1_y;
 427     org2.x = org2_x;
 428     org2.y = org2_y;
 429
 430     adg_adim_set_org(adim, &org1, &org2);
 431 }
 432
 433 /**
 434  * adg_adim_set_org_from_model:
 435  * @adim: an #AdgADim
 436  * @model: the source #AdgModel
 437  * @org1: name of the pair in @model to use as org1
 438  * @org2: name of the pair in @model to use as org2
 439  *
 440  * Sets #AdgADim:org1 and #AdgADim:org2 properties by linking
 441  * them to the @org1 and @org2 named pairs in @model. @org1
 442  * or @org2 could be %NULL (but not both), in which case
 443  * only the non-null origin point is changed.
 444  *
 445  * Using this function twice you can also link the origin
 446  * points to named pairs taken from different models:
 447  *
 448  * |[
 449  * adg_adim_set_org_from_model(adim, model1, org1, NULL);
 450  * adg_adim_set_org_from_model(adim, model2, NULL, org2);
 451  * ]|
 452  **/
 453 void
 454 adg_adim_set_org_from_model(AdgADim *adim, AdgModel *model,
 455                             const gchar *org1, const gchar *org2)
 456 {
 457     GObject *object;
 458     AdgADimPrivate *data;
 459
 460     g_return_if_fail(ADG_IS_ADIM(adim));
 461     g_return_if_fail(ADG_IS_MODEL(model));
 462     g_return_if_fail(org1 != NULL || org2 != NULL);
 463
 464     object = (GObject *) adim;
 465     data = adim->data;
 466
 467     g_object_freeze_notify(object);
 468
 469     if (org1 != NULL) {
 470         if (data->org1 == NULL)
 471             data->org1 = adg_point_new();
 472
 473         adg_point_set_pair_from_model(data->org1, model, org1);
 474
 475         g_object_notify(object, "org1");
 476     }
 477
 478     if (org2 != NULL) {
 479         if (data->org2 == NULL)
 480             data->org2 = adg_point_new();
 481
 482         adg_point_set_pair_from_model(data->org2, model, org2);
 483
 484         g_object_notify(object, "org2");
 485     }
 486
 487     g_object_thaw_notify(object);
 488 }
 489
 490 /**
 491  * adg_adim_get_org1:
 492  * @adim: an #AdgADim
 493  *
 494  * Gets the first origin of @adim. The returned pair is owned by
 495  * @adim and should not be modified or freed.
 496  *
 497  * Returns: a pointer to the internal #AdgPair or %NULL on errors
 498  **/
 499 const AdgPair *
 500 adg_adim_get_org1(AdgADim *adim)
 501 {
 502     AdgADimPrivate *data;
 503
 504     g_return_val_if_fail(ADG_IS_ADIM(adim), NULL);
 505
 506     data = adim->data;
 507
 508     return adg_point_get_pair(data->org1);
 509 }
 510
 511 /**
 512  * adg_adim_get_org2:
 513  * @adim: an #AdgADim
 514  *
 515  * Gets the second origin of @adim. The returned pair is owned by
 516  * @adim and should not be modified or freed.
 517  *
 518  * Returns: a pointer to the internal #AdgPair or %NULL on errors
 519  **/
 520 const AdgPair *
 521 adg_adim_get_org2(AdgADim *adim)
 522 {
 523     AdgADimPrivate *data;
 524
 525     g_return_val_if_fail(ADG_IS_ADIM(adim), NULL);
 526
 527     data = adim->data;
 528
 529     return adg_point_get_pair(data->org2);
 530 }
 531
 532
 533 static void
 534 local_changed(AdgEntity *entity)
 535 {
 536     unset_trail((AdgADim *) entity);
 537
 538     if (PARENT_ENTITY_CLASS->local_changed)
 539         PARENT_ENTITY_CLASS->local_changed(entity);
 540 }
 541
 542 static void
 543 invalidate(AdgEntity *entity)
 544 {
 545     AdgADim *adim;
 546     AdgADimPrivate *data;
 547
 548     adim = (AdgADim *) entity;
 549     data = adim->data;
 550
 551     dispose_markers(adim);
 552     data->geometry_arranged = FALSE;
 553     unset_trail(adim);
 554
 555     adg_point_invalidate(data->org1);
 556     adg_point_invalidate(data->org2);
 557
 558     if (PARENT_ENTITY_CLASS->invalidate)
 559         PARENT_ENTITY_CLASS->invalidate(entity);
 560 }
 561
 562 static void
 563 arrange(AdgEntity *entity)
 564 {
 565     AdgADim *adim;
 566     AdgDim *dim;
 567     AdgADimPrivate *data;
 568     AdgAlignment *quote;
 569     const AdgMatrix *local;
 570     AdgPair ref1, ref2, base1, base12, base2;
 571     AdgPair pair;
 572
 573     if (PARENT_ENTITY_CLASS->arrange)
 574         PARENT_ENTITY_CLASS->arrange(entity);
 575
 576     adim = (AdgADim *) entity;
 577     dim = (AdgDim *) adim;
 578     data = adim->data;
 579     quote = adg_dim_get_quote(dim);
 580
 581     update_geometry(adim);
 582     update_entities(adim);
 583
 584     if (data->cpml.path.status == CAIRO_STATUS_SUCCESS) {
 585         AdgEntity *quote_entity = (AdgEntity *) quote;
 586         adg_entity_set_global_map(quote_entity, &data->quote.global_map);
 587         return;
 588     }
 589
 590     local = adg_entity_get_local_matrix(entity);
 591     cpml_pair_copy(&ref1, adg_dim_get_ref1(dim));
 592     cpml_pair_copy(&ref2, adg_dim_get_ref2(dim));
 593     cpml_pair_copy(&base1, &data->point.base1);
 594     cpml_pair_copy(&base12, &data->point.base12);
 595     cpml_pair_copy(&base2, &data->point.base2);
 596
 597     /* Apply the local matrix to the relevant points */
 598     cpml_pair_transform(&ref1, local);
 599     cpml_pair_transform(&ref2, local);
 600     cpml_pair_transform(&base1, local);
 601     cpml_pair_transform(&base12, local);
 602     cpml_pair_transform(&base2, local);
 603
 604     /* Combine points and global shifts to build the path */
 605     cpml_pair_copy(&pair, &ref1);
 606     cpml_pair_add(&pair, &data->shift.from1);
 607     cpml_pair_to_cairo(&pair, &data->cpml.data[6]);
 608
 609     cpml_pair_copy(&pair, &base1);
 610     cpml_pair_add(&pair, &data->shift.base1);
 611     cpml_pair_to_cairo(&pair, &data->cpml.data[1]);
 612
 613     cpml_pair_add(&pair, &data->shift.to1);
 614     cpml_pair_to_cairo(&pair, &data->cpml.data[8]);
 615
 616     cpml_pair_copy(&pair, &base12);
 617     cpml_pair_add(&pair, &data->shift.base12);
 618     cpml_pair_to_cairo(&pair, &data->cpml.data[3]);
 619
 620     cpml_pair_copy(&pair, &ref2);
 621     cpml_pair_add(&pair, &data->shift.from2);
 622     cpml_pair_to_cairo(&pair, &data->cpml.data[10]);
 623
 624     cpml_pair_copy(&pair, &base2);
 625     cpml_pair_add(&pair, &data->shift.base2);
 626     cpml_pair_to_cairo(&pair, &data->cpml.data[4]);
 627
 628     cpml_pair_add(&pair, &data->shift.to2);
 629     cpml_pair_to_cairo(&pair, &data->cpml.data[12]);
 630
 631     data->cpml.path.status = CAIRO_STATUS_SUCCESS;
 632
 633     if (quote != NULL) {
 634         /* Update global and local map of the quote */
 635         AdgEntity *quote_entity;
 636         gdouble angle;
 637         AdgMatrix map;
 638
 639         quote_entity = (AdgEntity *) quote;
 640         angle = adg_dim_quote_angle(dim, (data->angle1 + data->angle2) / 2 + G_PI_2);
 641         cpml_pair_from_cairo(&pair, &data->cpml.data[3]);
 642
 643         adg_alignment_set_factor_explicit(quote, 0.5, 0);
 644
 645         cairo_matrix_init_translate(&map, pair.x, pair.y);
 646         cairo_matrix_rotate(&map, angle);
 647         adg_entity_set_global_map(quote_entity, &map);
 648
 649         adg_matrix_copy(&data->quote.global_map,
 650                         adg_entity_get_global_map(quote_entity));
 651     }
 652
 653     /* Signal to the markers (if any) that the path has changed */
 654     if (data->marker1 != NULL) {
 655         adg_marker_set_segment(data->marker1, data->trail, 1);
 656         adg_entity_local_changed((AdgEntity *) data->marker1);
 657     }
 658
 659     if (data->marker2 != NULL) {
 660         adg_marker_set_segment(data->marker2, data->trail, 1);
 661         adg_entity_local_changed((AdgEntity *) data->marker2);
 662     }
 663
 664     /* TODO: compute the extents */
 665 }
 666
 667 static void
 668 render(AdgEntity *entity, cairo_t *cr)
 669 {
 670     AdgADim *adim;
 671     AdgDim *dim;
 672     AdgADimPrivate *data;
 673     AdgDimStyle *dim_style;
 674     AdgDress dress;
 675     const cairo_path_t *cairo_path;
 676
 677     adim = (AdgADim *) entity;
 678     dim = (AdgDim *) entity;
 679     data = adim->data;
 680     dim_style = GET_DIM_STYLE(dim);
 681
 682     adg_style_apply((AdgStyle *) dim_style, entity, cr);
 683
 684     if (data->marker1 != NULL)
 685         adg_entity_render((AdgEntity *) data->marker1, cr);
 686
 687     if (data->marker2 != NULL)
 688         adg_entity_render((AdgEntity *) data->marker2, cr);
 689
 690     adg_entity_render((AdgEntity *) adg_dim_get_quote(dim), cr);
 691
 692     dress = adg_dim_style_get_line_dress(dim_style);
 693     adg_entity_apply_dress(entity, dress, cr);
 694
 695     cairo_path = adg_trail_get_cairo_path(data->trail);
 696     cairo_append_path(cr, cairo_path);
 697     cairo_stroke(cr);
 698 }
 699
 700 static gchar *
 701 default_value(AdgDim *dim)
 702 {
 703     AdgADim *adim;
 704     AdgADimPrivate *data;
 705     AdgDimStyle *dim_style;
 706     gdouble angle;
 707     const gchar *format;
 708
 709     adim = (AdgADim *) dim;
 710     data = adim->data;
 711     dim_style = GET_DIM_STYLE(dim);
 712     format = adg_dim_style_get_number_format(dim_style);
 713
 714     update_geometry(adim);
 715     angle = (data->angle2 - data->angle1) * 180 / M_PI;
 716
 717     return g_strdup_printf(format, angle);
 718 }
 719
 720 /* With "geometry" is considered any data (point, vector or angle)
 721  * that can be cached: this is strictly related on how the arrange()
 722  * method works */
 723 static void
 724 update_geometry(AdgADim *adim)
 725 {
 726     AdgADimPrivate *data;
 727     AdgDimStyle *dim_style;
 728     gdouble from_offset, to_offset;
 729     gdouble spacing, level;
 730     CpmlVector vector[3];
 731     CpmlPair center;
 732     gdouble distance;
 733
 734     data = adim->data;
 735
 736     if (data->geometry_arranged)
 737         return;
 738
 739     if (!get_info(adim, vector, &center, &distance)) {
 740         /* Parallel lines: hang with an error message */
 741         g_warning("%s: trying to set an angular dimension on parallel lines",
 742                   G_STRLOC);
 743         return;
 744     }
 745
 746     dim_style = GET_DIM_STYLE(adim);
 747     from_offset = adg_dim_style_get_from_offset(dim_style);
 748     to_offset = adg_dim_style_get_to_offset(dim_style);
 749     spacing = adg_dim_style_get_baseline_spacing(dim_style);
 750     level = adg_dim_get_level((AdgDim *) adim);
 751
 752     /* shift.from1 */
 753     cpml_vector_set_length(&vector[0], from_offset);
 754     cpml_pair_copy(&data->shift.from1, &vector[0]);
 755
 756     /* shift.base1 */
 757     cpml_vector_set_length(&vector[0], level * spacing);
 758     cpml_pair_copy(&data->shift.base1, &vector[0]);
 759
 760     /* shift.to1 */
 761     cpml_vector_set_length(&vector[0], to_offset);
 762     cpml_pair_copy(&data->shift.to1, &vector[0]);
 763
 764     /* shift.from2 */
 765     cpml_vector_set_length(&vector[2], from_offset);
 766     cpml_pair_copy(&data->shift.from2, &vector[2]);
 767
 768     /* shift.base2 */
 769     cpml_vector_set_length(&vector[2], level * spacing);
 770     cpml_pair_copy(&data->shift.base2, &vector[2]);
 771
 772     /* shift.to2 */
 773     cpml_vector_set_length(&vector[2], to_offset);
 774     cpml_pair_copy(&data->shift.to2, &vector[2]);
 775
 776     /* shift.base12 */
 777     cpml_vector_set_length(&vector[1], level * spacing);
 778     cpml_pair_copy(&data->shift.base12, &vector[1]);
 779
 780     /* Distance can be 0, so the following will leave the
 781      * vector array in undefined state */
 782
 783     /* point.base1 */
 784     cpml_vector_set_length(&vector[0], distance);
 785     cpml_pair_copy(&data->point.base1, &vector[0]);
 786     cpml_pair_add(&data->point.base1, &center);
 787
 788     /* point.base2 */
 789     cpml_vector_set_length(&vector[2], distance);
 790     cpml_pair_copy(&data->point.base2, &vector[2]);
 791     cpml_pair_add(&data->point.base2, &center);
 792
 793     /* point.base12 */
 794     cpml_vector_set_length(&vector[1], distance);
 795     cpml_pair_copy(&data->point.base12, &vector[1]);
 796     cpml_pair_add(&data->point.base12, &center);
 797
 798     data->geometry_arranged = TRUE;
 799 }
 800
 801 static void
 802 update_entities(AdgADim *adim)
 803 {
 804     AdgADimPrivate *data;
 805     AdgDimStyle *dim_style;
 806
 807     data = adim->data;
 808     dim_style = GET_DIM_STYLE(adim);
 809
 810     if (data->trail == NULL)
 811         data->trail = adg_trail_new(trail_callback, adim);
 812
 813     if (data->marker1 == NULL)
 814         data->marker1 = adg_dim_style_marker1_new(dim_style);
 815
 816     if (data->marker2 == NULL)
 817         data->marker2 = adg_dim_style_marker2_new(dim_style);
 818 }
 819
 820 static void
 821 unset_trail(AdgADim *adim)
 822 {
 823     AdgADimPrivate *data = adim->data;
 824
 825     if (data->trail != NULL)
 826         adg_model_clear((AdgModel *) data->trail);
 827
 828     data->cpml.path.status = CAIRO_STATUS_INVALID_PATH_DATA;
 829 }
 830
 831 static void
 832 dispose_markers(AdgADim *adim)
 833 {
 834     AdgADimPrivate *data = adim->data;
 835
 836     if (data->trail != NULL) {
 837         g_object_unref(data->trail);
 838         data->trail = NULL;
 839     }
 840
 841     if (data->marker1 != NULL) {
 842         g_object_unref(data->marker1);
 843         data->marker1 = NULL;
 844     }
 845
 846     if (data->marker2 != NULL) {
 847         g_object_unref(data->marker2);
 848         data->marker2 = NULL;
 849     }
 850 }
 851
 852 static gboolean
 853 get_info(AdgADim *adim, CpmlVector vector[],
 854          AdgPair *center, gdouble *distance)
 855 {
 856     AdgDim *dim;
 857     AdgADimPrivate *data;
 858     const AdgPair *ref1, *ref2;
 859     gdouble factor;
 860
 861     dim = (AdgDim *) adim;
 862     data = adim->data;
 863     ref1 = adg_dim_get_ref1(dim);
 864     ref2 = adg_dim_get_ref2(dim);
 865
 866     cpml_pair_copy(&vector[0], ref1);
 867     cpml_pair_sub(&vector[0], adg_point_get_pair(data->org1));
 868     cpml_pair_copy(&vector[2], ref2);
 869     cpml_pair_sub(&vector[2], adg_point_get_pair(data->org2));
 870
 871     factor = vector[0].x * vector[2].y - vector[0].y * vector[2].x;
 872     if (factor == 0)
 873         return FALSE;
 874
 875     factor = ((ref1->y - ref2->y) * vector[2].x -
 876               (ref1->x - ref2->x) * vector[2].y) / factor;
 877
 878     center->x = ref1->x + vector[0].x * factor;
 879     center->y = ref1->y + vector[0].y * factor;
 880     *distance = cpml_pair_distance(center, adg_dim_get_pos(dim));
 881     data->angle1 = cpml_vector_angle(&vector[0]);
 882     data->angle2 = cpml_vector_angle(&vector[2]);
 883     while (data->angle2 < data->angle1)
 884         data->angle2 += M_PI * 2;
 885
 886     cpml_vector_from_angle(&vector[1], (data->angle1 + data->angle2) / 2);
 887
 888     return TRUE;
 889 }
 890
 891 static CpmlPath *
 892 trail_callback(AdgTrail *trail, gpointer user_data)
 893 {
 894     AdgADim *adim;
 895     AdgADimPrivate *data;
 896
 897     adim = (AdgADim *) user_data;
 898     data = adim->data;
 899
 900     return &data->cpml.path;
 901 }