src/star-context.cpp

   1 #define __SP_STAR_CONTEXT_C__
   2
   3 /*
   4  * Star drawing context
   5  *
   6  * Authors:
   7  *   Mitsuru Oka <oka326@parkcity.ne.jp>
   8  *   Lauris Kaplinski <lauris@kaplinski.com>
   9  *   bulia byak <buliabyak@users.sf.net>
  10  *
  11  * Copyright (C) 1999-2002 Lauris Kaplinski
  12  * Copyright (C) 2001-2002 Mitsuru Oka
  13  *
  14  * Released under GNU GPL, read the file 'COPYING' for more information
  15  */
  16
  17 #ifdef HAVE_CONFIG_H
  18 # include "config.h"
  19 #endif
  20
  21 #include <cstring>
  22 #include <string>
  23
  24 #include <gdk/gdkkeysyms.h>
  25
  26 #include "macros.h"
  27 #include "display/sp-canvas.h"
  28 #include "sp-star.h"
  29 #include "document.h"
  30 #include "sp-namedview.h"
  31 #include "selection.h"
  32 #include "desktop-handles.h"
  33 #include "desktop-affine.h"
  34 #include "snap.h"
  35 #include "desktop.h"
  36 #include "desktop-style.h"
  37 #include "message-context.h"
  38 #include "pixmaps/cursor-star.xpm"
  39 #include "sp-metrics.h"
  40 #include <glibmm/i18n.h>
  41 #include "prefs-utils.h"
  42 #include "xml/repr.h"
  43 #include "xml/node-event-vector.h"
  44 #include "object-edit.h"
  45 #include "context-fns.h"
  46
  47 #include "star-context.h"
  48
  49 static void sp_star_context_class_init (SPStarContextClass * klass);
  50 static void sp_star_context_init (SPStarContext * star_context);
  51 static void sp_star_context_dispose (GObject *object);
  52
  53 static void sp_star_context_setup (SPEventContext *ec);
  54 static void sp_star_context_set (SPEventContext *ec, const gchar *key, const gchar *val);
  55 static gint sp_star_context_root_handler (SPEventContext *ec, GdkEvent *event);
  56
  57 static void sp_star_drag (SPStarContext * sc, NR::Point p, guint state);
  58 static void sp_star_finish (SPStarContext * sc);
  59
  60 static SPEventContextClass * parent_class;
  61
  62 GtkType
  63 sp_star_context_get_type (void)
  64 {
  65     static GType type = 0;
  66     if (!type) {
  67         GTypeInfo info = {
  68             sizeof (SPStarContextClass),
  69             NULL, NULL,
  70             (GClassInitFunc) sp_star_context_class_init,
  71             NULL, NULL,
  72             sizeof (SPStarContext),
  73             4,
  74             (GInstanceInitFunc) sp_star_context_init,
  75             NULL,    /* value_table */
  76         };
  77         type = g_type_register_static (SP_TYPE_EVENT_CONTEXT, "SPStarContext", &info, (GTypeFlags)0);
  78     }
  79     return type;
  80 }
  81
  82 static void
  83 sp_star_context_class_init (SPStarContextClass * klass)
  84 {
  85     GObjectClass *object_class = (GObjectClass *) klass;
  86     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  87
  88     parent_class = (SPEventContextClass*)g_type_class_peek_parent (klass);
  89
  90     object_class->dispose = sp_star_context_dispose;
  91
  92     event_context_class->setup = sp_star_context_setup;
  93     event_context_class->set = sp_star_context_set;
  94     event_context_class->root_handler = sp_star_context_root_handler;
  95 }
  96
  97 static void
  98 sp_star_context_init (SPStarContext * star_context)
  99 {
 100     SPEventContext *event_context = SP_EVENT_CONTEXT (star_context);
 101
 102     event_context->cursor_shape = cursor_star_xpm;
 103     event_context->hot_x = 4;
 104     event_context->hot_y = 4;
 105     event_context->xp = 0;
 106     event_context->yp = 0;
 107     event_context->tolerance = 0;
 108     event_context->within_tolerance = false;
 109     event_context->item_to_select = NULL;
 110
 111     event_context->shape_repr = NULL;
 112     event_context->shape_knot_holder = NULL;
 113
 114     star_context->item = NULL;
 115
 116     star_context->magnitude = 5;
 117     star_context->proportion = 0.5;
 118     star_context->isflatsided = false;
 119
 120     new (&star_context->sel_changed_connection) sigc::connection();
 121 }
 122
 123 static void
 124 sp_star_context_dispose (GObject *object)
 125 {
 126     SPEventContext *ec = SP_EVENT_CONTEXT (object);
 127     SPStarContext *sc = SP_STAR_CONTEXT (object);
 128
 129     ec->enableGrDrag(false);
 130
 131     sc->sel_changed_connection.disconnect();
 132     sc->sel_changed_connection.~connection();
 133
 134     if (ec->shape_knot_holder) {
 135         sp_knot_holder_destroy (ec->shape_knot_holder);
 136         ec->shape_knot_holder = NULL;
 137     }
 138
 139     if (ec->shape_repr) { // remove old listener
 140         sp_repr_remove_listener_by_data (ec->shape_repr, ec);
 141         Inkscape::GC::release(ec->shape_repr);
 142         ec->shape_repr = 0;
 143     }
 144
 145     /* fixme: This is necessary because we do not grab */
 146     if (sc->item) sp_star_finish (sc);
 147
 148     if (sc->_message_context) {
 149         delete sc->_message_context;
 150     }
 151
 152     G_OBJECT_CLASS (parent_class)->dispose (object);
 153 }
 154
 155 static Inkscape::XML::NodeEventVector ec_shape_repr_events = {
 156     NULL, /* child_added */
 157     NULL, /* child_removed */
 158     ec_shape_event_attr_changed,
 159     NULL, /* content_changed */
 160     NULL  /* order_changed */
 161 };
 162
 163 /**
 164 \brief  Callback that processes the "changed" signal on the selection;
 165 destroys old and creates new knotholder
 166 \param  selection Should not be NULL.
 167 */
 168 void
 169 sp_star_context_selection_changed (Inkscape::Selection * selection, gpointer data)
 170 {
 171     g_assert (selection != NULL);
 172
 173     SPStarContext *sc = SP_STAR_CONTEXT (data);
 174     SPEventContext *ec = SP_EVENT_CONTEXT (sc);
 175
 176     if (ec->shape_knot_holder) { // desktroy knotholder
 177         sp_knot_holder_destroy (ec->shape_knot_holder);
 178         ec->shape_knot_holder = NULL;
 179     }
 180
 181     if (ec->shape_repr) { // remove old listener
 182         sp_repr_remove_listener_by_data (ec->shape_repr, ec);
 183         Inkscape::GC::release(ec->shape_repr);
 184         ec->shape_repr = 0;
 185     }
 186
 187     SPItem *item = selection->singleItem();
 188     if (item) {
 189         ec->shape_knot_holder = sp_item_knot_holder (item, ec->desktop);
 190         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR (item);
 191         if (shape_repr) {
 192             ec->shape_repr = shape_repr;
 193             Inkscape::GC::anchor(shape_repr);
 194             sp_repr_add_listener (shape_repr, &ec_shape_repr_events, ec);
 195         }
 196     }
 197 }
 198
 199 static void
 200 sp_star_context_setup (SPEventContext *ec)
 201 {
 202    SPStarContext *sc = SP_STAR_CONTEXT (ec);
 203
 204     if (((SPEventContextClass *) parent_class)->setup)
 205         ((SPEventContextClass *) parent_class)->setup (ec);
 206
 207     sp_event_context_read (ec, "magnitude");
 208     sp_event_context_read (ec, "proportion");
 209     sp_event_context_read (ec, "isflatsided");
 210     sp_event_context_read (ec, "rounded");
 211     sp_event_context_read (ec, "randomized");
 212
 213     Inkscape::Selection *selection = sp_desktop_selection(ec->desktop);
 214
 215     SPItem *item = selection->singleItem();
 216         if (item) {
 217             ec->shape_knot_holder = sp_item_knot_holder (item, ec->desktop);
 218             Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR (item);
 219             if (shape_repr) {
 220                 ec->shape_repr = shape_repr;
 221                 Inkscape::GC::anchor(shape_repr);
 222                 sp_repr_add_listener (shape_repr, &ec_shape_repr_events, ec);
 223             }
 224         }
 225
 226     sc->sel_changed_connection.disconnect();
 227     sc->sel_changed_connection = selection->connectChanged(sigc::bind(sigc::ptr_fun(&sp_star_context_selection_changed), (gpointer)sc));
 228
 229     if (prefs_get_int_attribute("tools.shapes", "selcue", 0) != 0) {
 230         ec->enableSelectionCue();
 231     }
 232
 233     if (prefs_get_int_attribute("tools.shapes", "gradientdrag", 0) != 0) {
 234         ec->enableGrDrag();
 235     }
 236
 237     sc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 238 }
 239
 240 static void
 241 sp_star_context_set (SPEventContext *ec, const gchar *key, const gchar *val)
 242 {
 243     SPStarContext *sc = SP_STAR_CONTEXT (ec);
 244     if (!strcmp (key, "magnitude")) {
 245         sc->magnitude = (val) ? atoi (val) : 5;
 246         sc->magnitude = CLAMP (sc->magnitude, 3, 1024);
 247     } else if (!strcmp (key, "proportion")) {
 248         sc->proportion = (val) ? g_ascii_strtod (val, NULL) : 0.5;
 249         sc->proportion = CLAMP (sc->proportion, 0.01, 2.0);
 250     } else if (!strcmp (key, "isflatsided")) {
 251         if (val && !strcmp(val, "true"))
 252             sc->isflatsided = true;
 253         else
 254             sc->isflatsided = false;
 255     } else if (!strcmp (key, "rounded")) {
 256         sc->rounded = (val) ? g_ascii_strtod (val, NULL) : 0.0;
 257     } else if (!strcmp (key, "randomized")) {
 258         sc->randomized = (val) ? g_ascii_strtod (val, NULL) : 0.0;
 259     }
 260 }
 261
 262 static gint sp_star_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 263 {
 264     static gboolean dragging;
 265
 266     SPDesktop *desktop = event_context->desktop;
 267     Inkscape::Selection *selection = sp_desktop_selection (desktop);
 268
 269     SPStarContext *sc = SP_STAR_CONTEXT (event_context);
 270
 271     event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
 272
 273     gint ret = FALSE;
 274
 275     switch (event->type) {
 276     case GDK_BUTTON_PRESS:
 277         if (event->button.button == 1 && !event_context->space_panning) {
 278
 279             dragging = TRUE;
 280
 281             sc->center = Inkscape::setup_for_drag_start(desktop, event_context, event);
 282
 283             SnapManager const &m = desktop->namedview->snap_manager;
 284             sc->center = m.freeSnap(Inkscape::Snapper::SNAPPOINT_NODE, sc->center, sc->item).getPoint();
 285
 286             sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 287                                 GDK_KEY_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
 288                                 GDK_POINTER_MOTION_MASK | GDK_BUTTON_PRESS_MASK,
 289                                 NULL, event->button.time);
 290             ret = TRUE;
 291         }
 292         break;
 293     case GDK_MOTION_NOTIFY:
 294         if (dragging && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning) {
 295
 296             if ( event_context->within_tolerance
 297                  && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 298                  && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 299                 break; // do not drag if we're within tolerance from origin
 300             }
 301             // Once the user has moved farther than tolerance from the original location
 302             // (indicating they intend to draw, not click), then always process the
 303             // motion notify coordinates as given (no snapping back to origin)
 304             event_context->within_tolerance = false;
 305
 306             NR::Point const motion_w(event->motion.x, event->motion.y);
 307             NR::Point motion_dt(event_context->desktop->w2d(motion_w));
 308
 309             SnapManager const &m = desktop->namedview->snap_manager;
 310             motion_dt = m.freeSnap(Inkscape::Snapper::SNAPPOINT_NODE, motion_dt, sc->item).getPoint();
 311
 312             sp_star_drag (sc, motion_dt, event->motion.state);
 313
 314             gobble_motion_events(GDK_BUTTON1_MASK);
 315
 316             ret = TRUE;
 317         }
 318         break;
 319     case GDK_BUTTON_RELEASE:
 320         event_context->xp = event_context->yp = 0;
 321         if (event->button.button == 1 && !event_context->space_panning) {
 322             dragging = FALSE;
 323             if (!event_context->within_tolerance) {
 324                 // we've been dragging, finish the star
 325                 sp_star_finish (sc);
 326             } else if (event_context->item_to_select) {
 327                 // no dragging, select clicked item if any
 328                 if (event->button.state & GDK_SHIFT_MASK) {
 329                     selection->toggle(event_context->item_to_select);
 330                 } else {
 331                     selection->set(event_context->item_to_select);
 332                 }
 333             } else {
 334                 // click in an empty space
 335                 selection->clear();
 336             }
 337
 338             event_context->item_to_select = NULL;
 339             ret = TRUE;
 340             sp_canvas_item_ungrab(SP_CANVAS_ITEM (desktop->acetate), event->button.time);
 341         }
 342         break;
 343     case GDK_KEY_PRESS:
 344         switch (get_group0_keyval(&event->key)) {
 345         case GDK_Alt_R:
 346         case GDK_Control_L:
 347         case GDK_Control_R:
 348         case GDK_Shift_L:
 349         case GDK_Shift_R:
 350         case GDK_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
 351         case GDK_Meta_R:
 352             sp_event_show_modifier_tip(event_context->defaultMessageContext(), event,
 353                                        _("<b>Ctrl</b>: snap angle; keep rays radial"),
 354                                        NULL,
 355                                        NULL);
 356             break;
 357         case GDK_Up:
 358         case GDK_Down:
 359         case GDK_KP_Up:
 360         case GDK_KP_Down:
 361             // prevent the zoom field from activation
 362             if (!MOD__CTRL_ONLY)
 363                 ret = TRUE;
 364             break;
 365         case GDK_x:
 366         case GDK_X:
 367             if (MOD__ALT_ONLY) {
 368                 desktop->setToolboxFocusTo ("altx-star");
 369                 ret = TRUE;
 370             }
 371             break;
 372         case GDK_Escape:
 373             sp_desktop_selection(desktop)->clear();
 374             //TODO: make dragging escapable by Esc
 375             break;
 376
 377         case GDK_space:
 378             if (dragging) {
 379                 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
 380                                       event->button.time);
 381                 dragging = false;
 382                 if (!event_context->within_tolerance) {
 383                     // we've been dragging, finish the rect
 384                     sp_star_finish(sc);
 385                 }
 386                 // do not return true, so that space would work switching to selector
 387             }
 388             break;
 389
 390         default:
 391             break;
 392         }
 393         break;
 394     case GDK_KEY_RELEASE:
 395         switch (get_group0_keyval (&event->key)) {
 396         case GDK_Alt_L:
 397         case GDK_Alt_R:
 398         case GDK_Control_L:
 399         case GDK_Control_R:
 400         case GDK_Shift_L:
 401         case GDK_Shift_R:
 402         case GDK_Meta_L:  // Meta is when you press Shift+Alt
 403         case GDK_Meta_R:
 404             event_context->defaultMessageContext()->clear();
 405             break;
 406         default:
 407             break;
 408         }
 409         break;
 410     default:
 411         break;
 412     }
 413
 414     if (!ret) {
 415         if (((SPEventContextClass *) parent_class)->root_handler)
 416             ret = ((SPEventContextClass *) parent_class)->root_handler (event_context, event);
 417     }
 418
 419     return ret;
 420 }
 421
 422 static void sp_star_drag(SPStarContext *sc, NR::Point p, guint state)
 423 {
 424     SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
 425
 426     int const snaps = prefs_get_int_attribute ("options.rotationsnapsperpi", "value", 12);
 427
 428     if (!sc->item) {
 429
 430         if (Inkscape::have_viable_layer(desktop, sc->_message_context) == false) {
 431             return;
 432         }
 433
 434         /* Create object */
 435         Inkscape::XML::Document *xml_doc = sp_document_repr_doc(SP_EVENT_CONTEXT_DOCUMENT(sc));
 436         Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
 437         repr->setAttribute("sodipodi:type", "star");
 438
 439         /* Set style */
 440         sp_desktop_apply_style_tool(desktop, repr, "tools.shapes.star", false);
 441
 442         sc->item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 443         Inkscape::GC::release(repr);
 444         sc->item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
 445         sc->item->updateRepr();
 446
 447         sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 448     }
 449
 450     NR::Point const p0 = sp_desktop_dt2root_xy_point(desktop, sc->center);
 451     NR::Point p1 = sp_desktop_dt2root_xy_point(desktop, p);
 452
 453     /* Snap corner point with no constraints */
 454     SnapManager const &m = desktop->namedview->snap_manager;
 455     p1 = m.freeSnap(Inkscape::Snapper::SNAPPOINT_NODE, p1, sc->item).getPoint();
 456
 457     SPStar *star = SP_STAR(sc->item);
 458
 459     double const sides = (gdouble) sc->magnitude;
 460     NR::Point const d = p1 - p0;
 461     NR::Coord const r1 = NR::L2(d);
 462     double arg1 = atan2(d);
 463
 464     if (state & GDK_CONTROL_MASK) {
 465         /* Snap angle */
 466         arg1 = sp_round(arg1, M_PI / snaps);
 467     }
 468
 469     sp_star_position_set(star, sc->magnitude, p0, r1, r1 * sc->proportion,
 470                          arg1, arg1 + M_PI / sides, sc->isflatsided, sc->rounded, sc->randomized);
 471
 472     /* status text */
 473     GString *rads = SP_PX_TO_METRIC_STRING(r1, desktop->namedview->getDefaultMetric());
 474     sc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE,
 475                                ( sc->isflatsided?
 476                                  _("<b>Polygon</b>: radius %s, angle %5g&#176;; with <b>Ctrl</b> to snap angle")
 477                                  : _("<b>Star</b>: radius %s, angle %5g&#176;; with <b>Ctrl</b> to snap angle") ),
 478                                rads->str, sp_round((arg1) * 180 / M_PI, 0.0001));
 479
 480     g_string_free(rads, FALSE);
 481 }
 482
 483 static void
 484 sp_star_finish (SPStarContext * sc)
 485 {
 486     sc->_message_context->clear();
 487
 488     if (sc->item != NULL) {
 489         SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
 490         SPObject *object = SP_OBJECT(sc->item);
 491
 492         sp_shape_set_shape(SP_SHAPE(sc->item));
 493
 494         object->updateRepr(SP_OBJECT_WRITE_EXT);
 495
 496         sp_canvas_end_forced_full_redraws(desktop->canvas);
 497
 498         sp_desktop_selection(desktop)->set(sc->item);
 499         sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_STAR,
 500                          _("Create star"));
 501
 502         sc->item = NULL;
 503     }
 504 }
 505
 506 /*
 507   Local Variables:
 508   mode:c++
 509   c-file-style:"stroustrup"
 510   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 511   indent-tabs-mode:nil
 512   fill-column:99
 513   End:
 514 */
 515 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :