git.sur5r.net Git - glabels/blob - glabels2/src/view-line.c

   1 /*
   2  *  (GLABELS) Label and Business Card Creation program for GNOME
   3  *
   4  *  view_line.c:  GLabels label line object widget
   5  *
   6  *  Copyright (C) 2001-2002  Jim Evins <evins@snaught.com>.
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  21  */
  22
  23 #include <glib.h>
  24
  25 #include "view-line.h"
  26
  27 #include "view-highlight.h"
  28
  29 #include "wdgt-line.h"
  30 #include "wdgt-vector.h"
  31 #include "wdgt-position.h"
  32 #include "color.h"
  33 #include "prefs.h"
  34
  35 #include "pixmaps/cursor_line.xbm"
  36 #include "pixmaps/cursor_line_mask.xbm"
  37
  38 #include "debug.h"
  39
  40 /*========================================================*/
  41 /* Private macros and constants.                          */
  42 /*========================================================*/
  43
  44 /*========================================================*/
  45 /* Private types.                                         */
  46 /*========================================================*/
  47
  48 struct _glViewLinePrivate {
  49         GnomeCanvasItem       *item;
  50
  51         /* Property dialog Page 0 widgets */
  52         GtkWidget             *line;
  53
  54         /* Property dialog Page 1 widgets */
  55         GtkWidget             *position;
  56         GtkWidget             *vector;
  57 };
  58
  59 /*========================================================*/
  60 /* Private globals.                                       */
  61 /*========================================================*/
  62
  63 static glViewObjectClass *parent_class = NULL;
  64
  65
  66 /*========================================================*/
  67 /* Private function prototypes.                           */
  68 /*========================================================*/
  69
  70 static void      gl_view_line_class_init      (glViewLineClass *klass);
  71 static void      gl_view_line_instance_init   (glViewLine     *view_line);
  72 static void      gl_view_line_finalize        (GObject        *object);
  73
  74 static void      update_view_line_cb          (glLabelObject  *object,
  75                                                glViewLine     *view_line);
  76
  77 static GtkWidget *construct_properties_dialog (glViewLine     *view_line);
  78
  79 static void      response_cb                  (GtkDialog      *dialog,
  80                                                gint            response,
  81                                                glViewLine     *view_line);
  82
  83 static void      line_changed_cb              (glWdgtLine     *line,
  84                                                glViewLine     *view_line);
  85
  86 static void      position_changed_cb          (glWdgtPosition *position,
  87                                                glViewLine     *view_line);
  88
  89 static void      vector_changed_cb            (glWdgtVector   *vector,
  90                                                glViewLine     *view_line);
  91
  92 static void      update_dialog_cb             (glLabelObject  *object,
  93                                                glViewLine     *view_line);
  94
  95 static void      update_dialog_from_move_cb   (glLabelObject  *object,
  96                                                gdouble         dx,
  97                                                gdouble         dy,
  98                                                glViewLine     *view_line);
  99
 100 \f
 101 /*****************************************************************************/
 102 /* Boilerplate object stuff.                                                 */
 103 /*****************************************************************************/
 104 GType
 105 gl_view_line_get_type (void)
 106 {
 107         static GType type = 0;
 108
 109         if (!type) {
 110                 GTypeInfo info = {
 111                         sizeof (glViewLineClass),
 112                         NULL,
 113                         NULL,
 114                         (GClassInitFunc) gl_view_line_class_init,
 115                         NULL,
 116                         NULL,
 117                         sizeof (glViewLine),
 118                         0,
 119                         (GInstanceInitFunc) gl_view_line_instance_init,
 120                 };
 121
 122                 type = g_type_register_static (GL_TYPE_VIEW_OBJECT,
 123                                                "glViewLine", &info, 0);
 124         }
 125
 126         return type;
 127 }
 128
 129 static void
 130 gl_view_line_class_init (glViewLineClass *klass)
 131 {
 132         GObjectClass *object_class = (GObjectClass *) klass;
 133
 134         gl_debug (DEBUG_VIEW, "START");
 135
 136         parent_class = g_type_class_peek_parent (klass);
 137
 138         object_class->finalize = gl_view_line_finalize;
 139
 140         gl_debug (DEBUG_VIEW, "END");
 141 }
 142
 143 static void
 144 gl_view_line_instance_init (glViewLine *view_line)
 145 {
 146         gl_debug (DEBUG_VIEW, "START");
 147
 148         view_line->private = g_new0 (glViewLinePrivate, 1);
 149
 150         gl_debug (DEBUG_VIEW, "END");
 151 }
 152
 153 static void
 154 gl_view_line_finalize (GObject *object)
 155 {
 156         glLabel       *parent;
 157
 158         gl_debug (DEBUG_VIEW, "START");
 159
 160         g_return_if_fail (object && GL_IS_VIEW_LINE (object));
 161
 162         G_OBJECT_CLASS (parent_class)->finalize (object);
 163
 164         gl_debug (DEBUG_VIEW, "END");
 165 }
 166
 167 /*****************************************************************************/
 168 /* NEW line object view.                                                  */
 169 /*****************************************************************************/
 170 glViewObject *
 171 gl_view_line_new (glLabelLine *object,
 172                   glView     *view)
 173 {
 174         glViewLine         *view_line;
 175         gdouble            line_width;
 176         guint              line_color;
 177         gdouble            w, h;
 178         GtkMenu            *menu;
 179         GnomeCanvasPoints  *points;
 180
 181         gl_debug (DEBUG_VIEW, "START");
 182         g_return_if_fail (object && GL_IS_LABEL_LINE (object));
 183         g_return_if_fail (view && GL_IS_VIEW (view));
 184
 185         view_line = g_object_new (gl_view_line_get_type(), NULL);
 186
 187         gl_view_object_set_view (GL_VIEW_OBJECT(view_line), view);
 188         gl_view_object_set_object (GL_VIEW_OBJECT(view_line),
 189                                    GL_LABEL_OBJECT(object),
 190                                    GL_VIEW_HIGHLIGHT_LINE_RESIZABLE);
 191
 192         /* Query properties of object. */
 193         gl_label_object_get_size (GL_LABEL_OBJECT(object), &w, &h);
 194         line_width = gl_label_line_get_line_width(object);
 195         line_color = gl_label_line_get_line_color(object);
 196
 197         /* Create analogous canvas item. */
 198         points = gnome_canvas_points_new (2);
 199         points->coords[0] = 0.0;
 200         points->coords[1] = 0.0;
 201         points->coords[2] = w;
 202         points->coords[3] = h;
 203         view_line->private->item =
 204                 gl_view_object_item_new (GL_VIEW_OBJECT(view_line),
 205                                          gnome_canvas_line_get_type (),
 206                                          "points", points,
 207                                          "width_units", line_width,
 208                                          "fill_color_rgba", line_color,
 209                                          NULL);
 210         gnome_canvas_points_free (points);
 211
 212         g_signal_connect (G_OBJECT (object), "changed",
 213                           G_CALLBACK (update_view_line_cb), view_line);
 214
 215         /* Create a dialog for controlling/viewing object properties. */
 216         gl_view_object_set_dlg_constructor (GL_VIEW_OBJECT(view_line),
 217                                             GL_VIEW_OBJECT_DLG_CONSTRUCTOR(construct_properties_dialog));
 218
 219         gl_debug (DEBUG_VIEW, "END");
 220
 221         return GL_VIEW_OBJECT (view_line);
 222 }
 223
 224 /*---------------------------------------------------------------------------*/
 225 /* PRIVATE. label object "changed" callback.                                 */
 226 /*---------------------------------------------------------------------------*/
 227 static void
 228 update_view_line_cb (glLabelObject *object,
 229                      glViewLine     *view_line)
 230 {
 231         gdouble            line_width;
 232         guint              line_color;
 233         gdouble            w, h;
 234         GnomeCanvasPoints  *points;
 235
 236         gl_debug (DEBUG_VIEW, "START");
 237
 238         /* Query properties of object. */
 239         gl_label_object_get_size (GL_LABEL_OBJECT(object), &w, &h);
 240         line_width = gl_label_line_get_line_width(GL_LABEL_LINE(object));
 241         line_color = gl_label_line_get_line_color(GL_LABEL_LINE(object));
 242
 243         /* Adjust appearance of analogous canvas item. */
 244         points = gnome_canvas_points_new (2);
 245         points->coords[0] = 0.0;
 246         points->coords[1] = 0.0;
 247         points->coords[2] = w;
 248         points->coords[3] = h;
 249         gnome_canvas_item_set (view_line->private->item,
 250                                "points", points,
 251                                "width_units", line_width,
 252                                "fill_color_rgba", line_color,
 253                                NULL);
 254         gnome_canvas_points_free (points);
 255
 256         gl_debug (DEBUG_VIEW, "END");
 257 }
 258
 259 /*****************************************************************************/
 260 /* Create a properties dialog for a line object.                          */
 261 /*****************************************************************************/
 262 static GtkWidget *
 263 construct_properties_dialog (glViewLine *view_line)
 264 {
 265         GtkWidget          *dialog, *wsection;
 266         glLabelObject      *object;
 267         gdouble            line_width;
 268         guint              line_color;
 269         gdouble            x, y, w, h, label_width, label_height;
 270         GtkSizeGroup       *label_size_group;
 271         GtkWidget          *window;
 272
 273         gl_debug (DEBUG_VIEW, "START");
 274
 275         /* retrieve object and query parameters */
 276         object = gl_view_object_get_object (GL_VIEW_OBJECT(view_line));
 277         gl_label_object_get_position (GL_LABEL_OBJECT(object), &x, &y);
 278         gl_label_object_get_size (GL_LABEL_OBJECT(object), &w, &h);
 279         line_width = gl_label_line_get_line_width(GL_LABEL_LINE(object));
 280         line_color = gl_label_line_get_line_color(GL_LABEL_LINE(object));
 281         gl_label_get_size (GL_LABEL(object->parent),
 282                            &label_width, &label_height);
 283
 284         /*-----------------------------------------------------------------*/
 285         /* Build dialog with notebook.                                     */
 286         /*-----------------------------------------------------------------*/
 287         window = gtk_widget_get_toplevel (
 288                 GTK_WIDGET(gl_view_object_get_view(GL_VIEW_OBJECT(view_line))));
 289         dialog = gl_hig_dialog_new_with_buttons ( _("Edit line object properties"),
 290                                                   GTK_WINDOW (window),
 291                                                   GTK_DIALOG_DESTROY_WITH_PARENT,
 292                                                   GTK_STOCK_CLOSE,
 293                                                            GTK_RESPONSE_CLOSE,
 294                                                   NULL );
 295         gtk_window_set_resizable (GTK_WINDOW (dialog), FALSE);
 296         g_signal_connect (G_OBJECT (dialog), "response",
 297                           G_CALLBACK (response_cb), view_line);
 298
 299         label_size_group = gtk_size_group_new (GTK_SIZE_GROUP_HORIZONTAL);
 300
 301         /*---------------------------*/
 302         /* Line section              */
 303         /*---------------------------*/
 304         wsection = gl_hig_category_new (_("Line"));
 305         gl_hig_dialog_add_widget (GL_HIG_DIALOG(dialog), wsection);
 306         view_line->private->line = gl_wdgt_line_new ();
 307         gl_wdgt_line_set_label_size_group (GL_WDGT_LINE(view_line->private->line),
 308                                            label_size_group);
 309         gl_wdgt_line_set_params (GL_WDGT_LINE (view_line->private->line),
 310                                  line_width,
 311                                  line_color);
 312         gl_hig_category_add_widget (GL_HIG_CATEGORY(wsection),
 313                                     view_line->private->line);
 314         g_signal_connect (G_OBJECT (view_line->private->line), "changed",
 315                           G_CALLBACK(line_changed_cb), view_line);
 316
 317         /*---------------------------*/
 318         /* Position section          */
 319         /*---------------------------*/
 320         wsection = gl_hig_category_new (_("Position"));
 321         gl_hig_dialog_add_widget (GL_HIG_DIALOG(dialog), wsection);
 322         view_line->private->position = gl_wdgt_position_new ();
 323         gl_wdgt_position_set_label_size_group (GL_WDGT_POSITION(view_line->private->position),
 324                                                label_size_group);
 325         gl_wdgt_position_set_params (GL_WDGT_POSITION (view_line->private->position),
 326                                      x, y,
 327                                      label_width, label_height);
 328         gl_hig_category_add_widget (GL_HIG_CATEGORY(wsection),
 329                                     view_line->private->position);
 330         g_signal_connect (G_OBJECT (view_line->private->position),
 331                           "changed",
 332                           G_CALLBACK(position_changed_cb), view_line);
 333
 334
 335         /*---------------------------*/
 336         /* Size section              */
 337         /*---------------------------*/
 338         wsection = gl_hig_category_new (_("Size"));
 339         gl_hig_dialog_add_widget (GL_HIG_DIALOG(dialog), wsection);
 340         view_line->private->vector = gl_wdgt_vector_new ();
 341         gl_wdgt_vector_set_label_size_group (GL_WDGT_VECTOR(view_line->private->vector),
 342                                              label_size_group);
 343         gl_wdgt_vector_set_params (GL_WDGT_VECTOR (view_line->private->vector),
 344                                    w, h,
 345                                    label_width, label_height);
 346         gl_hig_category_add_widget (GL_HIG_CATEGORY(wsection),
 347                                     view_line->private->vector);
 348         g_signal_connect (G_OBJECT (view_line->private->vector), "changed",
 349                           G_CALLBACK(vector_changed_cb), view_line);
 350
 351
 352         /*----------------------------*/
 353         /* Track object changes.      */
 354         /*----------------------------*/
 355         g_signal_connect (G_OBJECT (object), "changed",
 356                           G_CALLBACK (update_dialog_cb), view_line);
 357         g_signal_connect (G_OBJECT (object), "moved",
 358                           G_CALLBACK (update_dialog_from_move_cb), view_line);
 359
 360         gl_debug (DEBUG_VIEW, "END");
 361
 362         return dialog;
 363 }
 364
 365 /*---------------------------------------------------------------------------*/
 366 /* PRIVATE.  "Response" callback.                                            */
 367 /*---------------------------------------------------------------------------*/
 368 static void
 369 response_cb (GtkDialog     *dialog,
 370              gint          response,
 371              glViewLine    *view_line)
 372 {
 373         gl_debug (DEBUG_VIEW, "START");
 374
 375         g_return_if_fail(dialog != NULL);
 376         g_return_if_fail(GTK_IS_DIALOG(dialog));
 377
 378         switch(response) {
 379         case GTK_RESPONSE_CLOSE:
 380                 gtk_widget_hide (GTK_WIDGET(dialog));
 381                 break;
 382         case GTK_RESPONSE_DELETE_EVENT:
 383                 break;
 384         default:
 385                 g_print ("response = %d", response);
 386                 g_assert_not_reached();
 387         }
 388
 389         gl_debug (DEBUG_VIEW, "END");
 390 }
 391
 392 /*---------------------------------------------------------------------------*/
 393 /* PRIVATE.  line properties "changed" callback.                             */
 394 /*---------------------------------------------------------------------------*/
 395 static void
 396 line_changed_cb (glWdgtLine     *line,
 397                  glViewLine     *view_line)
 398 {
 399         glLabelObject      *object;
 400         gdouble            line_width;
 401         guint              line_color;
 402
 403         gl_debug (DEBUG_VIEW, "START");
 404
 405         object = gl_view_object_get_object (GL_VIEW_OBJECT(view_line));
 406
 407         gl_wdgt_line_get_params (GL_WDGT_LINE (line),
 408                                  &line_width,
 409                                  &line_color);
 410
 411         g_signal_handlers_block_by_func (G_OBJECT(object),
 412                                          update_dialog_cb, view_line);
 413         gl_label_line_set_line_width(GL_LABEL_LINE(object), line_width);
 414         gl_label_line_set_line_color(GL_LABEL_LINE(object), line_color);
 415         g_signal_handlers_unblock_by_func (G_OBJECT(object),
 416                                            update_dialog_cb, view_line);
 417
 418         gl_debug (DEBUG_VIEW, "END");
 419 }
 420
 421 /*---------------------------------------------------------------------------*/
 422 /* PRIVATE.  position "changed" callback.                                    */
 423 /*---------------------------------------------------------------------------*/
 424 static void
 425 position_changed_cb (glWdgtPosition     *position,
 426                      glViewLine         *view_line)
 427 {
 428         glLabelObject      *object;
 429         gdouble            x, y;
 430
 431         gl_debug (DEBUG_VIEW, "START");
 432
 433         gl_wdgt_position_get_position (GL_WDGT_POSITION (position), &x, &y);
 434
 435         object = gl_view_object_get_object (GL_VIEW_OBJECT(view_line));
 436
 437         g_signal_handlers_block_by_func (G_OBJECT(object),
 438                                          update_dialog_cb, view_line);
 439         gl_label_object_set_position (GL_LABEL_OBJECT(object), x, y);
 440         g_signal_handlers_unblock_by_func (G_OBJECT(object),
 441                                            update_dialog_cb, view_line);
 442
 443         gl_debug (DEBUG_VIEW, "END");
 444 }
 445
 446 /*---------------------------------------------------------------------------*/
 447 /* PRIVATE.  vector "changed" callback.                                      */
 448 /*---------------------------------------------------------------------------*/
 449 static void
 450 vector_changed_cb (glWdgtVector     *vector,
 451                    glViewLine     *view_line)
 452 {
 453         glLabelObject *object;
 454         gdouble       w, h;
 455         gboolean      keep_aspect_ratio_flag;
 456
 457         gl_debug (DEBUG_VIEW, "START");
 458
 459         gl_wdgt_vector_get_params (GL_WDGT_VECTOR (vector), &w, &h);
 460
 461         object = gl_view_object_get_object (GL_VIEW_OBJECT(view_line));
 462
 463         g_signal_handlers_block_by_func (G_OBJECT(object),
 464                                          update_dialog_cb, view_line);
 465         gl_label_object_set_size (GL_LABEL_OBJECT(object), w, h);
 466         g_signal_handlers_unblock_by_func (G_OBJECT(object),
 467                                            update_dialog_cb, view_line);
 468
 469         gl_debug (DEBUG_VIEW, "END");
 470 }
 471
 472 /*---------------------------------------------------------------------------*/
 473 /* PRIVATE. label object "changed" callback.                                 */
 474 /*---------------------------------------------------------------------------*/
 475 static void
 476 update_dialog_cb (glLabelObject     *object,
 477                   glViewLine        *view_line)
 478 {
 479         gdouble            line_width;
 480         guint              line_color;
 481         gdouble            x, y, w, h, label_width, label_height;
 482
 483         gl_debug (DEBUG_VIEW, "START");
 484
 485         /* Query properties of object. */
 486         gl_label_object_get_position (GL_LABEL_OBJECT(object), &x, &y);
 487         gl_label_object_get_size (GL_LABEL_OBJECT(object), &w, &h);
 488         line_width = gl_label_line_get_line_width(GL_LABEL_LINE(object));
 489         line_color = gl_label_line_get_line_color(GL_LABEL_LINE(object));
 490         gl_label_get_size (GL_LABEL(object->parent),
 491                            &label_width, &label_height);
 492
 493         /* Block widget handlers to prevent recursion */
 494         g_signal_handlers_block_by_func (G_OBJECT(view_line->private->line),
 495                                          line_changed_cb, view_line);
 496         g_signal_handlers_block_by_func (G_OBJECT(view_line->private->position),
 497                                          position_changed_cb, view_line);
 498         g_signal_handlers_block_by_func (G_OBJECT(view_line->private->vector),
 499                                          vector_changed_cb, view_line);
 500
 501         /* Update widgets in property dialog */
 502         gl_wdgt_line_set_params (GL_WDGT_LINE (view_line->private->line),
 503                                  line_width,
 504                                  line_color);
 505         gl_wdgt_position_set_position (GL_WDGT_POSITION(view_line->private->position),
 506                                        x, y);
 507         gl_wdgt_vector_set_params (GL_WDGT_VECTOR(view_line->private->vector),
 508                                    w, h, label_width, label_height);
 509
 510         /* Unblock widget handlers */
 511         g_signal_handlers_unblock_by_func (G_OBJECT(view_line->private->line),
 512                                            line_changed_cb, view_line);
 513         g_signal_handlers_unblock_by_func (G_OBJECT(view_line->private->position),
 514                                            position_changed_cb, view_line);
 515         g_signal_handlers_unblock_by_func (G_OBJECT(view_line->private->vector),
 516                                            vector_changed_cb, view_line);
 517
 518
 519         gl_debug (DEBUG_VIEW, "END");
 520 }
 521
 522 /*---------------------------------------------------------------------------*/
 523 /* PRIVATE. label object "moved" callback.                                   */
 524 /*---------------------------------------------------------------------------*/
 525 static void
 526 update_dialog_from_move_cb (glLabelObject *object,
 527                             gdouble        dx,
 528                             gdouble        dy,
 529                             glViewLine    *view_line)
 530 {
 531         gdouble            x, y;
 532
 533         gl_debug (DEBUG_VIEW, "START");
 534
 535         /* Query properties of object. */
 536         gl_label_object_get_position (GL_LABEL_OBJECT(object), &x, &y);
 537
 538         /* Block widget handlers to prevent recursion */
 539         g_signal_handlers_block_by_func (G_OBJECT(view_line->private->position),
 540                                          position_changed_cb, view_line);
 541
 542         /* Update widgets in property dialog */
 543         gl_wdgt_position_set_position (GL_WDGT_POSITION(view_line->private->position),
 544                                        x, y);
 545
 546         /* Unblock widget handlers */
 547         g_signal_handlers_unblock_by_func (G_OBJECT(view_line->private->position),
 548                                            position_changed_cb, view_line);
 549
 550         gl_debug (DEBUG_VIEW, "END");
 551 }
 552
 553 /*****************************************************************************/
 554 /* Return apropos cursor for create object mode.                             */
 555 /*****************************************************************************/
 556 GdkCursor *
 557 gl_view_line_get_create_cursor (void)
 558 {
 559         static GdkCursor *cursor = NULL;
 560         GdkPixmap        *pixmap_data, *pixmap_mask;
 561         GdkColor         fg = { 0, 0, 0, 0 };
 562         GdkColor         bg = { 0, 65535, 65535, 65535 };
 563
 564         gl_debug (DEBUG_VIEW, "START");
 565
 566         if (!cursor) {
 567                 pixmap_data = gdk_bitmap_create_from_data (NULL,
 568                                                            cursor_line_bits,
 569                                                            cursor_line_width,
 570                                                            cursor_line_height);
 571                 pixmap_mask = gdk_bitmap_create_from_data (NULL,
 572                                                            cursor_line_mask_bits,
 573                                                            cursor_line_mask_width,
 574                                                            cursor_line_mask_height);
 575                 cursor =
 576                     gdk_cursor_new_from_pixmap (pixmap_data, pixmap_mask, &fg,
 577                                                 &bg, cursor_line_x_hot,
 578                                                 cursor_line_y_hot);
 579         }
 580
 581         gl_debug (DEBUG_VIEW, "END");
 582
 583         return cursor;
 584 }
 585
 586 /*****************************************************************************/
 587 /* Canvas event handler for creating line objects.                            */
 588 /*****************************************************************************/
 589 int
 590 gl_view_line_create_event_handler (GnomeCanvas *canvas,
 591                                    GdkEvent    *event,
 592                                    glView      *view)
 593 {
 594         static gdouble      x0, y0;
 595         static gboolean     dragging = FALSE;
 596         static glViewObject *view_line;
 597         static GObject      *object;
 598         gdouble             x, y, w, h;
 599
 600         gl_debug (DEBUG_VIEW, "");
 601
 602         switch (event->type) {
 603
 604         case GDK_BUTTON_PRESS:
 605                 switch (event->button.button) {
 606                 case 1:
 607                         dragging = TRUE;
 608                         gdk_pointer_grab (GTK_WIDGET (view->canvas)->window,
 609                                           FALSE,
 610                                           GDK_POINTER_MOTION_MASK |
 611                                           GDK_BUTTON_RELEASE_MASK |
 612                                           GDK_BUTTON_PRESS_MASK,
 613                                           NULL, NULL, event->button.time);
 614                         gnome_canvas_window_to_world (canvas,
 615                                                       event->button.x,
 616                                                       event->button.y, &x, &y);
 617                         object = gl_label_line_new (view->label);
 618                         gl_label_object_set_position (GL_LABEL_OBJECT(object),
 619                                                       x, y);
 620                         gl_label_object_set_size (GL_LABEL_OBJECT(object),
 621                                                   0.0, 0.0);
 622                         gl_label_line_set_line_width (GL_LABEL_LINE(object),
 623                                                       gl_prefs->default_line_width);
 624                         gl_label_line_set_line_color (GL_LABEL_LINE(object),
 625                                                      gl_color_set_opacity (gl_prefs->default_line_color, 0.5));
 626                         view_line = gl_view_line_new (GL_LABEL_LINE(object),
 627                                                       view);
 628                         x0 = x;
 629                         y0 = y;
 630                         return TRUE;
 631
 632                 default:
 633                         return FALSE;
 634                 }
 635
 636         case GDK_BUTTON_RELEASE:
 637                 switch (event->button.button) {
 638                 case 1:
 639                         dragging = FALSE;
 640                         gdk_pointer_ungrab (event->button.time);
 641                         gnome_canvas_window_to_world (canvas,
 642                                                       event->button.x,
 643                                                       event->button.y, &x, &y);
 644                         if ((x0 == x) && (y0 == y)) {
 645                                 x = x0 + 36.0;
 646                                 y = y0 + 36.0;
 647                         }
 648                         w = x - x0;
 649                         h = y - y0;
 650                         gl_label_object_set_size (GL_LABEL_OBJECT(object),
 651                                                   w, h);
 652                         gl_label_line_set_line_color (GL_LABEL_LINE(object),
 653                                                      gl_prefs->default_line_color);
 654                         gl_view_unselect_all (view);
 655                         gl_view_object_select (GL_VIEW_OBJECT(view_line));
 656                         gl_view_arrow_mode (view);
 657                         return TRUE;
 658
 659                 default:
 660                         return FALSE;
 661                 }
 662
 663         case GDK_MOTION_NOTIFY:
 664                 if (dragging && (event->motion.state & GDK_BUTTON1_MASK)) {
 665                         gnome_canvas_window_to_world (canvas,
 666                                                       event->motion.x,
 667                                                       event->motion.y, &x, &y);
 668                         w = x - x0;
 669                         h = y - y0;
 670                         gl_label_object_set_size (GL_LABEL_OBJECT(object),
 671                                                   w, h);
 672                         return TRUE;
 673                 } else {
 674                         return FALSE;
 675                 }
 676
 677         default:
 678                 return FALSE;
 679         }
 680
 681 }