adg/adg-rdim.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-rdim
  23  * @short_description: Linear dimensions
  24  *
  25  * The #AdgRDim entity represents a linear dimension.
  26  **/
  27
  28 /**
  29  * AdgRDim:
  30  *
  31  * All fields are private and should not be used directly.
  32  * Use its public methods instead.
  33  **/
  34
  35
  36 #include "adg-rdim.h"
  37 #include "adg-rdim-private.h"
  38 #include "adg-dim-private.h"
  39 #include "adg-dim-style.h"
  40 #include "adg-intl.h"
  41
  42 #define PARENT_OBJECT_CLASS  ((GObjectClass *) adg_rdim_parent_class)
  43 #define PARENT_ENTITY_CLASS  ((AdgEntityClass *) adg_rdim_parent_class)
  44
  45
  46 static void             dispose                 (GObject        *object);
  47 static void             local_changed           (AdgEntity      *entity);
  48 static void             invalidate              (AdgEntity      *entity);
  49 static void             arrange                 (AdgEntity      *entity);
  50 static void             render                  (AdgEntity      *entity,
  51                                                  cairo_t        *cr);
  52 static gchar *          default_value           (AdgDim         *dim);
  53 static void             update_geometry         (AdgRDim        *rdim);
  54 static void             update_entities         (AdgRDim        *rdim);
  55 static void             unset_trail             (AdgRDim        *rdim);
  56 static void             dispose_marker          (AdgRDim        *rdim);
  57 static CpmlPath *       trail_callback          (AdgTrail       *trail,
  58                                                  gpointer        user_data);
  59
  60
  61 G_DEFINE_TYPE(AdgRDim, adg_rdim, ADG_TYPE_DIM);
  62
  63
  64 static void
  65 adg_rdim_class_init(AdgRDimClass *klass)
  66 {
  67     GObjectClass *gobject_class;
  68     AdgEntityClass *entity_class;
  69     AdgDimClass *dim_class;
  70
  71     gobject_class = (GObjectClass *) klass;
  72     entity_class = (AdgEntityClass *) klass;
  73     dim_class = (AdgDimClass *) klass;
  74
  75     g_type_class_add_private(klass, sizeof(AdgRDimPrivate));
  76
  77     gobject_class->dispose = dispose;
  78
  79     entity_class->local_changed = local_changed;
  80     entity_class->invalidate = invalidate;
  81     entity_class->arrange = arrange;
  82     entity_class->render = render;
  83
  84     dim_class->default_value = default_value;
  85 }
  86
  87 static void
  88 adg_rdim_init(AdgRDim *rdim)
  89 {
  90     AdgRDimPrivate *data;
  91     cairo_path_data_t move_to, line_to;
  92
  93     data = G_TYPE_INSTANCE_GET_PRIVATE(rdim, ADG_TYPE_RDIM, AdgRDimPrivate);
  94     move_to.header.type = CAIRO_PATH_MOVE_TO;
  95     move_to.header.length = 2;
  96     line_to.header.type = CAIRO_PATH_LINE_TO;
  97     line_to.header.length = 2;
  98
  99     data->trail = NULL;
 100     data->marker = NULL;
 101     data->geometry_arranged = FALSE;
 102     data->radius = -1.;
 103     data->shift.base.x = data->shift.base.y = 0;
 104     cairo_matrix_init_identity(&data->quote.local_map);
 105     cairo_matrix_init_identity(&data->quote.global_map);
 106
 107     data->cpml.path.status = CAIRO_STATUS_INVALID_PATH_DATA;
 108     data->cpml.path.data = data->cpml.data;
 109     data->cpml.path.num_data = G_N_ELEMENTS(data->cpml.data);
 110     data->cpml.path.data[0] = move_to;
 111     data->cpml.path.data[2] = line_to;
 112     data->cpml.path.data[4] = move_to;
 113     data->cpml.path.data[6] = line_to;
 114
 115     rdim->data = data;
 116 }
 117
 118 static void
 119 dispose(GObject *object)
 120 {
 121     dispose_marker((AdgRDim *) object);
 122
 123     if (PARENT_OBJECT_CLASS->dispose != NULL)
 124         PARENT_OBJECT_CLASS->dispose(object);
 125 }
 126
 127
 128 /**
 129  * adg_rdim_new:
 130  *
 131  * Creates a new uninitialized radial dimension. To be useful, you
 132  * need at least define the center of the arc to quote (ref1) and
 133  * a point on the arc (ref2) with adg_dim_set_ref() and the
 134  * position of the quote with adg_dim_set_pos().
 135  *
 136  * Returns: a newly created quote
 137  **/
 138 AdgRDim *
 139 adg_rdim_new(void)
 140 {
 141     return g_object_new(ADG_TYPE_RDIM, NULL);
 142 }
 143
 144 /**
 145  * adg_rdim_new_full:
 146  * @center: center of the arc to quote
 147  * @radius: where the quote must be applied on the arc
 148  * @pos: position of the quote text
 149  *
 150  * Creates a new quote by specifying explicitely all the needed
 151  * data to get a valid quote.
 152  *
 153  * Returns: a newly created quote
 154  **/
 155 AdgRDim *
 156 adg_rdim_new_full(const AdgPair *center, const AdgPair *radius,
 157                   const AdgPair *pos)
 158 {
 159     AdgRDim *rdim;
 160     AdgDim *dim;
 161
 162     rdim = adg_rdim_new();
 163     dim = (AdgDim *) rdim;
 164
 165     adg_dim_set_ref(dim, center, radius);
 166     adg_dim_set_pos(dim, pos);
 167
 168     return rdim;
 169 }
 170
 171 /**
 172  * adg_rdim_new_full_explicit:
 173  * @center_x: x coordinate of the center of the arc to quote
 174  * @center_y: y coordinate of the center of the arc to quote
 175  * @radius_x: x coordiante where the quote must be applied on the arc
 176  * @radius_y: y coordiante where the quote must be applied on the arc
 177  * @pos_x: x coordinate of the quote text
 178  * @pos_y: y coordinate of the quote text
 179  *
 180  * Does the same job of adg_rdim_full() but using specific coordinates
 181  * instead of AdgPair structures.
 182  * data to get a valid quote.
 183  *
 184  * Returns: a newly created quote
 185  **/
 186 AdgRDim *
 187 adg_rdim_new_full_explicit(gdouble center_x, gdouble center_y,
 188                            gdouble radius_x, gdouble radius_y,
 189                            gdouble pos_x,    gdouble pos_y)
 190 {
 191     AdgPair center, radius, pos;
 192
 193     center.x = center_x;
 194     center.y = center_y;
 195     radius.x = radius_x;
 196     radius.y = radius_y;
 197     pos.x = pos_x;
 198     pos.y = pos_y;
 199
 200     return adg_rdim_new_full(&center, &radius, &pos);
 201 }
 202
 203
 204 static void
 205 local_changed(AdgEntity *entity)
 206 {
 207     unset_trail((AdgRDim *) entity);
 208
 209     PARENT_ENTITY_CLASS->local_changed(entity);
 210 }
 211
 212 static void
 213 invalidate(AdgEntity *entity)
 214 {
 215     AdgRDim *rdim;
 216     AdgRDimPrivate *data;
 217
 218     rdim = (AdgRDim *) entity;
 219     data = rdim->data;
 220
 221     dispose_marker(rdim);
 222     data->geometry_arranged = FALSE;
 223     unset_trail(rdim);
 224
 225     if (PARENT_ENTITY_CLASS->invalidate != NULL)
 226         PARENT_ENTITY_CLASS->invalidate(entity);
 227 }
 228
 229 static void
 230 arrange(AdgEntity *entity)
 231 {
 232     AdgRDim *rdim;
 233     AdgDim *dim;
 234     AdgRDimPrivate *data;
 235     AdgContainer *quote;
 236     AdgDimStyle *dim_style;
 237     gboolean outside;
 238     const AdgMatrix *local;
 239     AdgPair ref1, ref2, base;
 240     AdgPair pair;
 241
 242     PARENT_ENTITY_CLASS->arrange(entity);
 243
 244     rdim = (AdgRDim *) entity;
 245     dim = (AdgDim *) rdim;
 246     data = rdim->data;
 247     quote = adg_dim_get_quote(dim);
 248
 249     update_geometry(rdim);
 250     update_entities(rdim);
 251
 252     if (data->cpml.path.status == CAIRO_STATUS_SUCCESS) {
 253         AdgEntity *quote_entity = (AdgEntity *) quote;
 254         adg_entity_set_global_map(quote_entity, &data->quote.global_map);
 255         adg_entity_set_local_map(quote_entity, &data->quote.local_map);
 256         return;
 257     }
 258
 259     dim_style = GET_DIM_STYLE(dim);
 260     outside = adg_dim_get_outside(dim);
 261     if (outside == ADG_THREE_STATE_UNKNOWN)
 262         outside = ADG_THREE_STATE_OFF;
 263
 264     local = adg_entity_local_matrix(entity);
 265     cpml_pair_copy(&ref1, adg_dim_get_ref1(dim));
 266     cpml_pair_copy(&ref2, adg_dim_get_ref2(dim));
 267     cpml_pair_copy(&base, &data->point.base);
 268
 269     cpml_pair_transform(&ref1, local);
 270     cpml_pair_transform(&ref2, local);
 271     cpml_pair_transform(&base, local);
 272     cpml_pair_add(&base, &data->shift.base);
 273
 274     /* baseline start */
 275     cpml_pair_to_cairo(&base, &data->cpml.data[1]);
 276
 277     /* baseline end */
 278     cpml_pair_to_cairo(&ref2, &data->cpml.data[3]);
 279
 280     if (outside) {
 281         data->cpml.data[2].header.length = 2;
 282         /* TODO: outside radius dimensions */
 283     } else {
 284         data->cpml.data[2].header.length = 6;
 285     }
 286
 287     data->cpml.path.status = CAIRO_STATUS_SUCCESS;
 288
 289     if (quote != NULL) {
 290         /* Update global and local map of the quote container */
 291         AdgEntity *quote_entity;
 292         AdgMatrix matrix;
 293
 294         quote_entity = (AdgEntity *) quote;
 295         adg_matrix_copy(&matrix, local);
 296         cairo_matrix_invert(&matrix);
 297
 298         cpml_pair_from_cairo(&pair, &data->cpml.data[1]);
 299         cairo_matrix_transform_point(&matrix, &pair.x, &pair.y);
 300         cairo_matrix_init_translate(&matrix, pair.x, pair.y);
 301         adg_entity_set_local_map(quote_entity, &matrix);
 302
 303         cairo_matrix_init_rotate(&matrix, data->angle);
 304         adg_entity_transform_global_map(quote_entity, &matrix,
 305                                         ADG_TRANSFORM_BEFORE);
 306
 307         adg_entity_get_global_map(quote_entity, &data->quote.global_map);
 308         adg_entity_get_local_map(quote_entity, &data->quote.local_map);
 309     }
 310
 311     if (data->marker != NULL) {
 312         adg_marker_set_segment(data->marker, data->trail, outside ? 2 : 1);
 313         adg_entity_local_changed((AdgEntity *) data->marker);
 314     }
 315
 316     /* TODO: compute the extents */
 317 }
 318
 319 static void
 320 render(AdgEntity *entity, cairo_t *cr)
 321 {
 322     AdgRDim *rdim;
 323     AdgDim *dim;
 324     AdgRDimPrivate *data;
 325     AdgDimStyle *dim_style;
 326     AdgDress dress;
 327     const cairo_path_t *cairo_path;
 328
 329     rdim = (AdgRDim *) entity;
 330     dim = (AdgDim *) entity;
 331     data = rdim->data;
 332     dim_style = GET_DIM_STYLE(dim);
 333
 334     adg_style_apply((AdgStyle *) dim_style, entity, cr);
 335
 336     if (data->marker != NULL)
 337         adg_entity_render((AdgEntity *) data->marker, cr);
 338
 339     adg_entity_render((AdgEntity *) adg_dim_get_quote(dim), cr);
 340
 341     dress = adg_dim_style_get_line_dress(dim_style);
 342     adg_entity_apply_dress(entity, dress, cr);
 343
 344     cairo_path = adg_trail_get_cairo_path(data->trail);
 345     cairo_append_path(cr, cairo_path);
 346     cairo_stroke(cr);
 347 }
 348
 349 static gchar *
 350 default_value(AdgDim *dim)
 351 {
 352     AdgRDim *rdim;
 353     AdgRDimPrivate *data;
 354     AdgDimStyle *dim_style;
 355     const gchar *format;
 356
 357     rdim = (AdgRDim *) dim;
 358     data = rdim->data;
 359     dim_style = GET_DIM_STYLE(dim);
 360     format = adg_dim_style_get_number_format(dim_style);
 361
 362     update_geometry(rdim);
 363
 364     return g_strdup_printf(format, data->radius);
 365 }
 366
 367 static void
 368 update_geometry(AdgRDim *rdim)
 369 {
 370     AdgRDimPrivate *data;
 371     AdgDim *dim;
 372     AdgDimStyle *dim_style;
 373     const AdgPair *ref1, *ref2;
 374     const AdgPair *pos;
 375     gdouble spacing, level, pos_distance;
 376     CpmlVector vector;
 377
 378     data = rdim->data;
 379
 380     if (data->geometry_arranged)
 381         return;
 382
 383     dim = (AdgDim *) rdim;
 384     dim_style = GET_DIM_STYLE(rdim);
 385     ref1 = adg_dim_get_ref1(dim);
 386     ref2 = adg_dim_get_ref2(dim);
 387     pos = adg_dim_get_pos(dim);
 388     spacing = adg_dim_style_get_baseline_spacing(dim_style);
 389     level = adg_dim_get_level(dim);
 390     pos_distance = cpml_pair_distance(pos, ref1);
 391     cpml_pair_sub(cpml_pair_copy(&vector, ref2), ref1);
 392     if (cpml_pair_squared_distance(pos, ref1) <
 393         cpml_pair_squared_distance(pos, ref2))
 394         cpml_pair_negate(&vector);
 395
 396     /* radius */
 397     data->radius = cpml_pair_distance(&vector, NULL);
 398
 399     /* angle */
 400     data->angle = adg_dim_quote_angle(dim, cpml_vector_angle(&vector));
 401
 402     /* point.base */
 403     cpml_pair_copy(&data->point.base, &vector);
 404     cpml_vector_set_length(&data->point.base, pos_distance);
 405     cpml_pair_add(&data->point.base, ref1);
 406
 407     /* shift.base */
 408     cpml_pair_copy(&data->shift.base, &vector);
 409     cpml_vector_set_length(&data->shift.base, spacing * level);
 410
 411     data->geometry_arranged = TRUE;
 412 }
 413
 414 static void
 415 update_entities(AdgRDim *rdim)
 416 {
 417     AdgRDimPrivate *data;
 418     AdgDimStyle *dim_style;
 419
 420     data = rdim->data;
 421     dim_style = GET_DIM_STYLE(rdim);
 422
 423     if (data->trail == NULL)
 424         data->trail = adg_trail_new(trail_callback, rdim);
 425
 426     if (data->marker == NULL)
 427         data->marker = adg_dim_style_marker2_new(dim_style);
 428 }
 429
 430 static void
 431 unset_trail(AdgRDim *rdim)
 432 {
 433     AdgRDimPrivate *data = rdim->data;
 434
 435     if (data->trail != NULL)
 436         adg_model_clear((AdgModel *) data->trail);
 437
 438     data->cpml.path.status = CAIRO_STATUS_INVALID_PATH_DATA;
 439 }
 440
 441 static void
 442 dispose_marker(AdgRDim *rdim)
 443 {
 444     AdgRDimPrivate *data = rdim->data;
 445
 446     if (data->trail != NULL) {
 447         g_object_unref(data->trail);
 448         data->trail = NULL;
 449     }
 450
 451     if (data->marker != NULL) {
 452         g_object_unref(data->marker);
 453         data->marker = NULL;
 454     }
 455 }
 456
 457 static CpmlPath *
 458 trail_callback(AdgTrail *trail, gpointer user_data)
 459 {
 460     AdgRDim *rdim;
 461     AdgRDimPrivate *data;
 462
 463     rdim = (AdgRDim *) user_data;
 464     data = rdim->data;
 465
 466     return &data->cpml.path;
 467 }