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-adim.h"
  37 #include "adg-adim-private.h"
  38 #include "adg-dim-private.h"
  39 #include "adg-intl.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 = CAIRO_PATH_MOVE_TO;
 132     move_to.header.length = 2;
 133     line_to.header.type = CAIRO_PATH_LINE_TO;
 134     line_to.header.length = 2;
 135     arc_to.header.type = CAIRO_PATH_ARC_TO;
 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 != NULL)
 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_get_org1:
 362  * @adim: an #AdgADim
 363  *
 364  * Gets the first origin of @adim. The returned pair is owned by
 365  * @adim and should not be modified or freed.
 366  *
 367  * Returns: a pointer to the internal #AdgPair or %NULL on errors
 368  **/
 369 const AdgPair *
 370 adg_adim_get_org1(AdgADim *adim)
 371 {
 372     AdgADimPrivate *data;
 373
 374     g_return_val_if_fail(ADG_IS_ADIM(adim), NULL);
 375
 376     data = adim->data;
 377
 378     return adg_point_pair(data->org1);
 379 }
 380
 381 /**
 382  * adg_adim_get_org2:
 383  * @adim: an #AdgADim
 384  *
 385  * Gets the second origin of @adim. The returned pair is owned by
 386  * @adim and should not be modified or freed.
 387  *
 388  * Returns: a pointer to the internal #AdgPair or %NULL on errors
 389  **/
 390 const AdgPair *
 391 adg_adim_get_org2(AdgADim *adim)
 392 {
 393     AdgADimPrivate *data;
 394
 395     g_return_val_if_fail(ADG_IS_ADIM(adim), NULL);
 396
 397     data = adim->data;
 398
 399     return adg_point_pair(data->org2);
 400 }
 401
 402 /**
 403  * adg_adim_set_org:
 404  * @adim: an #AdgADim
 405  * @org1: the first origin
 406  * @org2: the second origin
 407  *
 408  * Sets at once the two origins on @adim. One of @org1 or @org2
 409  * (but not both) could be %NULL, in which case only the non-null
 410  * origin is set.
 411  **/
 412 void
 413 adg_adim_set_org(AdgADim *adim, const AdgPair *org1, const AdgPair *org2)
 414 {
 415     GObject *object;
 416     AdgADimPrivate *data;
 417
 418     g_return_if_fail(ADG_IS_ADIM(adim));
 419     g_return_if_fail(org1 != NULL || org2 != NULL);
 420
 421     object = (GObject *) adim;
 422     data = adim->data;
 423
 424     g_object_freeze_notify(object);
 425
 426     if (org1 != NULL) {
 427         if (data->org1 == NULL)
 428             data->org1 = adg_point_new();
 429
 430         adg_point_set(data->org1, org1);
 431
 432         g_object_notify(object, "org1");
 433     }
 434
 435     if (org2 != NULL) {
 436         if (data->org2 == NULL)
 437             data->org2 = adg_point_new();
 438
 439         adg_point_set(data->org2, org2);
 440
 441         g_object_notify(object, "org2");
 442     }
 443
 444     g_object_thaw_notify(object);
 445 }
 446
 447 /**
 448  * adg_adim_set_org_explicit:
 449  * @adim: an #AdgADim
 450  * @org1_x: x coordinate of org1
 451  * @org1_y: y coordinate of org1
 452  * @org2_x: x coordinate of org2
 453  * @org2_y: y coordinate of org2
 454  *
 455  * Works in the same way as adg_adim_set_org() but using
 456  * explicit coordinates instead of #AdgPair args. The
 457  * notable difference is that, by using gdouble values,
 458  * you can't set only a single origin point.
 459  **/
 460 void
 461 adg_adim_set_org_explicit(AdgADim *adim,
 462                           gdouble org1_x, gdouble org1_y,
 463                           gdouble org2_x, gdouble org2_y)
 464 {
 465     AdgPair org1, org2;
 466
 467     org1.x = org1_x;
 468     org1.y = org1_y;
 469     org2.x = org2_x;
 470     org2.y = org2_y;
 471
 472     adg_adim_set_org(adim, &org1, &org2);
 473 }
 474
 475 /**
 476  * adg_adim_set_org_from_model:
 477  * @adim: an #AdgADim
 478  * @model: the source #AdgModel
 479  * @org1: name of the pair in @model to use as org1
 480  * @org2: name of the pair in @model to use as org2
 481  *
 482  * Sets #AdgADim:org1 and #AdgADim:org2 properties by linking
 483  * them to the @org1 and @org2 named pairs in @model. @org1
 484  * or @org2 could be %NULL (but not both), in which case
 485  * only the non-null origin point is changed.
 486  *
 487  * Using this function twice you can also link the origin
 488  * points to named pairs taken from different models:
 489  *
 490  * |[
 491  * adg_adim_set_org_from_model(adim, model1, org1, NULL);
 492  * adg_adim_set_org_from_model(adim, model2, NULL, org2);
 493  * ]|
 494  **/
 495 void
 496 adg_adim_set_org_from_model(AdgADim *adim, AdgModel *model,
 497                             const gchar *org1, const gchar *org2)
 498 {
 499     GObject *object;
 500     AdgADimPrivate *data;
 501
 502     g_return_if_fail(ADG_IS_ADIM(adim));
 503     g_return_if_fail(ADG_IS_MODEL(model));
 504     g_return_if_fail(org1 != NULL || org2 != NULL);
 505
 506     object = (GObject *) adim;
 507     data = adim->data;
 508
 509     g_object_freeze_notify(object);
 510
 511     if (org1 != NULL) {
 512         if (data->org1 == NULL)
 513             data->org1 = adg_point_new();
 514
 515         adg_point_set_from_model(data->org1, model, org1);
 516
 517         g_object_notify(object, "org1");
 518     }
 519
 520     if (org2 != NULL) {
 521         if (data->org2 == NULL)
 522             data->org2 = adg_point_new();
 523
 524         adg_point_set_from_model(data->org2, model, org2);
 525
 526         g_object_notify(object, "org2");
 527     }
 528
 529     g_object_thaw_notify(object);
 530 }
 531
 532
 533 static void
 534 local_changed(AdgEntity *entity)
 535 {
 536     unset_trail((AdgADim *) entity);
 537
 538     PARENT_ENTITY_CLASS->local_changed(entity);
 539 }
 540
 541 static void
 542 invalidate(AdgEntity *entity)
 543 {
 544     AdgADim *adim;
 545     AdgADimPrivate *data;
 546
 547     adim = (AdgADim *) entity;
 548     data = adim->data;
 549
 550     dispose_markers(adim);
 551     data->geometry_arranged = FALSE;
 552     unset_trail(adim);
 553
 554     adg_point_invalidate(data->org1);
 555     adg_point_invalidate(data->org2);
 556
 557     if (PARENT_ENTITY_CLASS->invalidate != NULL)
 558         PARENT_ENTITY_CLASS->invalidate(entity);
 559 }
 560
 561 static void
 562 arrange(AdgEntity *entity)
 563 {
 564     AdgADim *adim;
 565     AdgDim *dim;
 566     AdgADimPrivate *data;
 567     AdgContainer *quote;
 568     const AdgMatrix *local;
 569     AdgPair ref1, ref2, base1, base12, base2;
 570     AdgPair pair;
 571
 572     PARENT_ENTITY_CLASS->arrange(entity);
 573
 574     adim = (AdgADim *) entity;
 575     dim = (AdgDim *) adim;
 576     data = adim->data;
 577     quote = adg_dim_get_quote(dim);
 578
 579     update_geometry(adim);
 580     update_entities(adim);
 581
 582     if (data->cpml.path.status == CAIRO_STATUS_SUCCESS) {
 583         AdgEntity *quote_entity = (AdgEntity *) quote;
 584         adg_entity_set_global_map(quote_entity, &data->quote.global_map);
 585         adg_entity_set_local_map(quote_entity, &data->quote.local_map);
 586         return;
 587     }
 588
 589     local = adg_entity_local_matrix(entity);
 590
 591     /* Apply the local matrix to the relevant points */
 592     cpml_pair_transform(cpml_pair_copy(&ref1, adg_dim_get_ref1(dim)), local);
 593     cpml_pair_transform(cpml_pair_copy(&ref2, adg_dim_get_ref2(dim)), local);
 594     cpml_pair_transform(cpml_pair_copy(&base1, &data->point.base1), local);
 595     cpml_pair_transform(cpml_pair_copy(&base12, &data->point.base12), local);
 596     cpml_pair_transform(cpml_pair_copy(&base2, &data->point.base2), local);
 597
 598     /* Combine points and global shifts to build the path */
 599     cpml_pair_add(cpml_pair_copy(&pair, &ref1), &data->shift.from1);
 600     cpml_pair_to_cairo(&pair, &data->cpml.data[6]);
 601
 602     cpml_pair_add(cpml_pair_copy(&pair, &base1), &data->shift.base1);
 603     cpml_pair_to_cairo(&pair, &data->cpml.data[1]);
 604
 605     cpml_pair_add(&pair, &data->shift.to1);
 606     cpml_pair_to_cairo(&pair, &data->cpml.data[8]);
 607
 608     cpml_pair_add(cpml_pair_copy(&pair, &base12), &data->shift.base12);
 609     cpml_pair_to_cairo(&pair, &data->cpml.data[3]);
 610
 611     cpml_pair_add(cpml_pair_copy(&pair, &ref2), &data->shift.from2);
 612     cpml_pair_to_cairo(&pair, &data->cpml.data[10]);
 613
 614     cpml_pair_add(cpml_pair_copy(&pair, &base2), &data->shift.base2);
 615     cpml_pair_to_cairo(&pair, &data->cpml.data[4]);
 616
 617     cpml_pair_add(&pair, &data->shift.to2);
 618     cpml_pair_to_cairo(&pair, &data->cpml.data[12]);
 619
 620     data->cpml.path.status = CAIRO_STATUS_SUCCESS;
 621
 622     if (quote != NULL) {
 623         /* Update global and local map of the quote container */
 624         AdgEntity *quote_entity;
 625         gdouble angle;
 626         AdgMatrix matrix;
 627
 628         quote_entity = (AdgEntity *) quote;
 629         angle = adg_dim_quote_angle(dim, (data->angle1 + data->angle2) / 2 + G_PI_2);
 630         adg_matrix_copy(&matrix, local);
 631         cairo_matrix_invert(&matrix);
 632
 633         cpml_pair_from_cairo(&pair, &data->cpml.data[3]);
 634         cairo_matrix_transform_point(&matrix, &pair.x, &pair.y);
 635         cairo_matrix_init_translate(&matrix, pair.x, pair.y);
 636         adg_entity_set_local_map(quote_entity, &matrix);
 637
 638         cairo_matrix_init_rotate(&matrix, angle);
 639         adg_entity_transform_global_map(quote_entity, &matrix, ADG_TRANSFORM_BEFORE);
 640
 641         adg_entity_get_global_map(quote_entity, &data->quote.global_map);
 642         adg_entity_get_local_map(quote_entity, &data->quote.local_map);
 643     }
 644
 645     /* Signal to the markers (if any) that the path has changed */
 646     if (data->marker1 != NULL) {
 647         adg_marker_set_segment(data->marker1, data->trail, 1);
 648         adg_entity_local_changed((AdgEntity *) data->marker1);
 649     }
 650
 651     if (data->marker2 != NULL) {
 652         adg_marker_set_segment(data->marker2, data->trail, 1);
 653         adg_entity_local_changed((AdgEntity *) data->marker2);
 654     }
 655
 656     /* TODO: compute the extents */
 657 }
 658
 659 static void
 660 render(AdgEntity *entity, cairo_t *cr)
 661 {
 662     AdgADim *adim;
 663     AdgDim *dim;
 664     AdgADimPrivate *data;
 665     AdgDimStyle *dim_style;
 666     AdgDress dress;
 667     const cairo_path_t *cairo_path;
 668
 669     adim = (AdgADim *) entity;
 670     dim = (AdgDim *) entity;
 671     data = adim->data;
 672     dim_style = GET_DIM_STYLE(dim);
 673
 674     adg_style_apply((AdgStyle *) dim_style, entity, cr);
 675
 676     if (data->marker1 != NULL)
 677         adg_entity_render((AdgEntity *) data->marker1, cr);
 678
 679     if (data->marker2 != NULL)
 680         adg_entity_render((AdgEntity *) data->marker2, cr);
 681
 682     adg_entity_render((AdgEntity *) adg_dim_get_quote(dim), cr);
 683
 684     dress = adg_dim_style_get_line_dress(dim_style);
 685     adg_entity_apply_dress(entity, dress, cr);
 686
 687     cairo_path = adg_trail_get_cairo_path(data->trail);
 688     cairo_append_path(cr, cairo_path);
 689     cairo_stroke(cr);
 690 }
 691
 692 static gchar *
 693 default_value(AdgDim *dim)
 694 {
 695     AdgADim *adim;
 696     AdgADimPrivate *data;
 697     AdgDimStyle *dim_style;
 698     gdouble angle;
 699     const gchar *format;
 700
 701     adim = (AdgADim *) dim;
 702     data = adim->data;
 703     dim_style = GET_DIM_STYLE(dim);
 704     format = adg_dim_style_get_number_format(dim_style);
 705
 706     update_geometry(adim);
 707     angle = (data->angle2 - data->angle1) * 180 / M_PI;
 708
 709     return g_strdup_printf(format, angle);
 710 }
 711
 712 /* With "geometry" is considered any data (point, vector or angle)
 713  * that can be cached: this is strictly related on how the arrange()
 714  * method works */
 715 static void
 716 update_geometry(AdgADim *adim)
 717 {
 718     AdgADimPrivate *data;
 719     AdgDimStyle *dim_style;
 720     gdouble from_offset, to_offset;
 721     gdouble spacing, level;
 722     CpmlVector vector[3];
 723     CpmlPair center;
 724     gdouble distance;
 725
 726     data = adim->data;
 727
 728     if (data->geometry_arranged)
 729         return;
 730
 731     if (!get_info(adim, vector, &center, &distance)) {
 732         /* Parallel lines: hang with an error message */
 733         g_warning("%s: trying to set an angular dimension on parallel lines",
 734                   G_STRLOC);
 735         return;
 736     }
 737
 738     dim_style = GET_DIM_STYLE(adim);
 739     from_offset = adg_dim_style_get_from_offset(dim_style);
 740     to_offset = adg_dim_style_get_to_offset(dim_style);
 741     spacing = adg_dim_style_get_baseline_spacing(dim_style);
 742     level = adg_dim_get_level((AdgDim *) adim);
 743
 744     /* shift.from1 */
 745     cpml_vector_set_length(&vector[0], from_offset);
 746     cpml_pair_copy(&data->shift.from1, &vector[0]);
 747
 748     /* shift.base1 */
 749     cpml_vector_set_length(&vector[0], level * spacing);
 750     cpml_pair_copy(&data->shift.base1, &vector[0]);
 751
 752     /* shift.to1 */
 753     cpml_vector_set_length(&vector[0], to_offset);
 754     cpml_pair_copy(&data->shift.to1, &vector[0]);
 755
 756     /* shift.from2 */
 757     cpml_vector_set_length(&vector[2], from_offset);
 758     cpml_pair_copy(&data->shift.from2, &vector[2]);
 759
 760     /* shift.base2 */
 761     cpml_vector_set_length(&vector[2], level * spacing);
 762     cpml_pair_copy(&data->shift.base2, &vector[2]);
 763
 764     /* shift.to2 */
 765     cpml_vector_set_length(&vector[2], to_offset);
 766     cpml_pair_copy(&data->shift.to2, &vector[2]);
 767
 768     /* shift.base12 */
 769     cpml_vector_set_length(&vector[1], level * spacing);
 770     cpml_pair_copy(&data->shift.base12, &vector[1]);
 771
 772     /* Distance can be 0, so the following will leave the
 773      * vector array in undefined state */
 774
 775     /* point.base1 */
 776     cpml_vector_set_length(&vector[0], distance);
 777     cpml_pair_add(cpml_pair_copy(&data->point.base1, &vector[0]), &center);
 778
 779     /* point.base2 */
 780     cpml_vector_set_length(&vector[2], distance);
 781     cpml_pair_add(cpml_pair_copy(&data->point.base2, &vector[2]), &center);
 782
 783     /* point.base12 */
 784     cpml_vector_set_length(&vector[1], distance);
 785     cpml_pair_add(cpml_pair_copy(&data->point.base12, &vector[1]), &center);
 786
 787     data->geometry_arranged = TRUE;
 788 }
 789
 790 static void
 791 update_entities(AdgADim *adim)
 792 {
 793     AdgADimPrivate *data;
 794     AdgDimStyle *dim_style;
 795
 796     data = adim->data;
 797     dim_style = GET_DIM_STYLE(adim);
 798
 799     if (data->trail == NULL)
 800         data->trail = adg_trail_new(trail_callback, adim);
 801
 802     if (data->marker1 == NULL)
 803         data->marker1 = adg_dim_style_marker1_new(dim_style);
 804
 805     if (data->marker2 == NULL)
 806         data->marker2 = adg_dim_style_marker2_new(dim_style);
 807 }
 808
 809 static void
 810 unset_trail(AdgADim *adim)
 811 {
 812     AdgADimPrivate *data = adim->data;
 813
 814     if (data->trail != NULL)
 815         adg_model_clear((AdgModel *) data->trail);
 816
 817     data->cpml.path.status = CAIRO_STATUS_INVALID_PATH_DATA;
 818 }
 819
 820 static void
 821 dispose_markers(AdgADim *adim)
 822 {
 823     AdgADimPrivate *data = adim->data;
 824
 825     if (data->trail != NULL) {
 826         g_object_unref(data->trail);
 827         data->trail = NULL;
 828     }
 829
 830     if (data->marker1 != NULL) {
 831         g_object_unref(data->marker1);
 832         data->marker1 = NULL;
 833     }
 834
 835     if (data->marker2 != NULL) {
 836         g_object_unref(data->marker2);
 837         data->marker2 = NULL;
 838     }
 839 }
 840
 841 static gboolean
 842 get_info(AdgADim *adim, CpmlVector vector[],
 843          AdgPair *center, gdouble *distance)
 844 {
 845     AdgDim *dim;
 846     AdgADimPrivate *data;
 847     const AdgPair *ref1, *ref2;
 848     gdouble factor;
 849
 850     dim = (AdgDim *) adim;
 851     data = adim->data;
 852     ref1 = adg_dim_get_ref1(dim);
 853     ref2 = adg_dim_get_ref2(dim);
 854
 855     cpml_pair_sub(cpml_pair_copy(&vector[0], ref1), adg_point_pair(data->org1));
 856     cpml_pair_sub(cpml_pair_copy(&vector[2], ref2), adg_point_pair(data->org2));
 857
 858     factor = vector[0].x * vector[2].y - vector[0].y * vector[2].x;
 859     if (factor == 0)
 860         return FALSE;
 861
 862     factor = ((ref1->y - ref2->y) * vector[2].x -
 863               (ref1->x - ref2->x) * vector[2].y) / factor;
 864
 865     center->x = ref1->x + vector[0].x * factor;
 866     center->y = ref1->y + vector[0].y * factor;
 867     *distance = cpml_pair_distance(center, adg_dim_get_pos(dim));
 868     data->angle1 = cpml_vector_angle(&vector[0]);
 869     data->angle2 = cpml_vector_angle(&vector[2]);
 870     while (data->angle2 < data->angle1)
 871         data->angle2 += M_PI * 2;
 872
 873     cpml_vector_from_angle(&vector[1], (data->angle1 + data->angle2) / 2);
 874
 875     return TRUE;
 876 }
 877
 878 static CpmlPath *
 879 trail_callback(AdgTrail *trail, gpointer user_data)
 880 {
 881     AdgADim *adim;
 882     AdgADimPrivate *data;
 883
 884     adim = (AdgADim *) user_data;
 885     data = adim->data;
 886
 887     return &data->cpml.path;
 888 }