src/spiral-context.cpp

   1 #define __SP_SPIRAL_CONTEXT_C__
   2
   3 /*
   4  * Spiral drawing context
   5  *
   6  * Authors:
   7  *   Mitsuru Oka
   8  *   Lauris Kaplinski <lauris@kaplinski.com>
   9  *   bulia byak <buliabyak@users.sf.net>
  10  *
  11  * Copyright (C) 1999-2001 Lauris Kaplinski
  12  * Copyright (C) 2001-2002 Mitsuru Oka
  13  *
  14  * Released under GNU GPL
  15  */
  16
  17 #include "config.h"
  18
  19 #include <gdk/gdkkeysyms.h>
  20
  21 #include "macros.h"
  22 #include "display/sp-canvas.h"
  23 #include "sp-spiral.h"
  24 #include "document.h"
  25 #include "sp-namedview.h"
  26 #include "selection.h"
  27 #include "desktop-handles.h"
  28 #include "desktop-affine.h"
  29 #include "snap.h"
  30 #include "desktop.h"
  31 #include "desktop-style.h"
  32 #include "message-context.h"
  33 #include "pixmaps/cursor-spiral.xpm"
  34 #include "pixmaps/cursor-spiral.pixbuf"
  35 #include "spiral-context.h"
  36 #include "sp-metrics.h"
  37 #include <glibmm/i18n.h>
  38 #include "object-edit.h"
  39 #include "xml/repr.h"
  40 #include "xml/node-event-vector.h"
  41 #include "prefs-utils.h"
  42 #include "context-fns.h"
  43
  44 static void sp_spiral_context_class_init(SPSpiralContextClass * klass);
  45 static void sp_spiral_context_init(SPSpiralContext *spiral_context);
  46 static void sp_spiral_context_dispose(GObject *object);
  47 static void sp_spiral_context_setup(SPEventContext *ec);
  48 static void sp_spiral_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  49
  50 static gint sp_spiral_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  51
  52 static void sp_spiral_drag(SPSpiralContext *sc, NR::Point p, guint state);
  53 static void sp_spiral_finish(SPSpiralContext *sc);
  54
  55 static SPEventContextClass *parent_class;
  56
  57 GtkType
  58 sp_spiral_context_get_type()
  59 {
  60     static GType type = 0;
  61     if (!type) {
  62         GTypeInfo info = {
  63             sizeof(SPSpiralContextClass),
  64             NULL, NULL,
  65             (GClassInitFunc) sp_spiral_context_class_init,
  66             NULL, NULL,
  67             sizeof(SPSpiralContext),
  68             4,
  69             (GInstanceInitFunc) sp_spiral_context_init,
  70             NULL,    /* value_table */
  71         };
  72         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPSpiralContext", &info, (GTypeFlags)0);
  73     }
  74     return type;
  75 }
  76
  77 static void
  78 sp_spiral_context_class_init(SPSpiralContextClass *klass)
  79 {
  80     GObjectClass *object_class = (GObjectClass *) klass;
  81     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  82
  83     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
  84
  85     object_class->dispose = sp_spiral_context_dispose;
  86
  87     event_context_class->setup = sp_spiral_context_setup;
  88     event_context_class->set = sp_spiral_context_set;
  89     event_context_class->root_handler = sp_spiral_context_root_handler;
  90 }
  91
  92 static void
  93 sp_spiral_context_init(SPSpiralContext *spiral_context)
  94 {
  95     SPEventContext *event_context = SP_EVENT_CONTEXT(spiral_context);
  96
  97     event_context->cursor_shape = cursor_spiral_xpm;
  98     event_context->cursor_pixbuf = gdk_pixbuf_new_from_inline(
  99             -1,
 100             cursor_spiral_pixbuf,
 101             FALSE,
 102             NULL);
 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     spiral_context->item = NULL;
 115
 116     spiral_context->revo = 3.0;
 117     spiral_context->exp = 1.0;
 118     spiral_context->t0 = 0.0;
 119
 120     new (&spiral_context->sel_changed_connection) sigc::connection();
 121 }
 122
 123 static void
 124 sp_spiral_context_dispose(GObject *object)
 125 {
 126     SPSpiralContext *sc = SP_SPIRAL_CONTEXT(object);
 127     SPEventContext *ec = SP_EVENT_CONTEXT(object);
 128
 129     ec->enableGrDrag(false);
 130
 131     sc->sel_changed_connection.disconnect();
 132     sc->sel_changed_connection.~connection();
 133
 134     /* fixme: This is necessary because we do not grab */
 135     if (sc->item) sp_spiral_finish(sc);
 136
 137     if (ec->shape_knot_holder) {
 138         sp_knot_holder_destroy(ec->shape_knot_holder);
 139         ec->shape_knot_holder = NULL;
 140     }
 141
 142     if (ec->shape_repr) { // remove old listener
 143         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 144         Inkscape::GC::release(ec->shape_repr);
 145         ec->shape_repr = 0;
 146     }
 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 */
 167 void
 168 sp_spiral_context_selection_changed(Inkscape::Selection *selection, gpointer data)
 169 {
 170     SPSpiralContext *sc = SP_SPIRAL_CONTEXT(data);
 171     SPEventContext *ec = SP_EVENT_CONTEXT(sc);
 172
 173     if (ec->shape_knot_holder) { // desktroy knotholder
 174         sp_knot_holder_destroy(ec->shape_knot_holder);
 175         ec->shape_knot_holder = NULL;
 176     }
 177
 178     if (ec->shape_repr) { // remove old listener
 179         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 180         Inkscape::GC::release(ec->shape_repr);
 181         ec->shape_repr = 0;
 182     }
 183
 184     SPItem *item = selection->singleItem();
 185     if (item) {
 186         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 187         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 188         if (shape_repr) {
 189             ec->shape_repr = shape_repr;
 190             Inkscape::GC::anchor(shape_repr);
 191             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 192         }
 193     }
 194 }
 195
 196 static void
 197 sp_spiral_context_setup(SPEventContext *ec)
 198 {
 199     SPSpiralContext *sc = SP_SPIRAL_CONTEXT(ec);
 200
 201     if (((SPEventContextClass *) parent_class)->setup)
 202         ((SPEventContextClass *) parent_class)->setup(ec);
 203
 204     sp_event_context_read(ec, "expansion");
 205     sp_event_context_read(ec, "revolution");
 206     sp_event_context_read(ec, "t0");
 207
 208     Inkscape::Selection *selection = sp_desktop_selection(ec->desktop);
 209
 210     SPItem *item = selection->singleItem();
 211     if (item) {
 212         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 213         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 214         if (shape_repr) {
 215             ec->shape_repr = shape_repr;
 216             Inkscape::GC::anchor(shape_repr);
 217             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 218         }
 219     }
 220
 221     sc->sel_changed_connection.disconnect();
 222     sc->sel_changed_connection = selection->connectChanged(sigc::bind(sigc::ptr_fun(&sp_spiral_context_selection_changed), (gpointer)sc));
 223
 224     if (prefs_get_int_attribute("tools.shapes", "selcue", 0) != 0) {
 225         ec->enableSelectionCue();
 226     }
 227
 228     if (prefs_get_int_attribute("tools.shapes", "gradientdrag", 0) != 0) {
 229         ec->enableGrDrag();
 230     }
 231
 232     sc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 233 }
 234
 235 static void
 236 sp_spiral_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 237 {
 238     SPSpiralContext *sc = SP_SPIRAL_CONTEXT(ec);
 239
 240     if (!strcmp(key, "expansion")) {
 241         sc->exp = (val) ? g_ascii_strtod(val, NULL) : 1.0;
 242         sc->exp = CLAMP(sc->exp, 0.0, 1000.0);
 243     } else if (!strcmp(key, "revolution")) {
 244         sc->revo = (val) ? g_ascii_strtod(val, NULL) : 3.0;
 245         sc->revo = CLAMP(sc->revo, 0.05, 40.0);
 246     } else if (!strcmp(key, "t0")) {
 247         sc->t0 = (val) ? g_ascii_strtod(val, NULL) : 0.0;
 248         sc->t0 = CLAMP(sc->t0, 0.0, 0.999);
 249     }
 250 }
 251
 252 static gint
 253 sp_spiral_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 254 {
 255     static gboolean dragging;
 256
 257     SPDesktop *desktop = event_context->desktop;
 258     Inkscape::Selection *selection = sp_desktop_selection (desktop);
 259     SPSpiralContext *sc = SP_SPIRAL_CONTEXT(event_context);
 260
 261     event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
 262
 263     gint ret = FALSE;
 264
 265     switch (event->type) {
 266         case GDK_BUTTON_PRESS:
 267             if (event->button.button == 1) {
 268
 269                 dragging = TRUE;
 270                 sc->center = Inkscape::setup_for_drag_start(desktop, event_context, event);
 271
 272                 SnapManager const &m = desktop->namedview->snap_manager;
 273                 sc->center = m.freeSnap(Inkscape::Snapper::SNAP_POINT, sc->center, sc->item).getPoint();
 274
 275                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 276                                     ( GDK_KEY_PRESS_MASK |
 277                                       GDK_BUTTON_RELEASE_MASK |
 278                                       GDK_POINTER_MOTION_MASK |
 279                                       GDK_BUTTON_PRESS_MASK    ),
 280                                     NULL, event->button.time);
 281                 ret = TRUE;
 282             }
 283             break;
 284         case GDK_MOTION_NOTIFY:
 285             if (dragging && event->motion.state && GDK_BUTTON1_MASK) {
 286
 287                 if ( event_context->within_tolerance
 288                      && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 289                      && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 290                     break; // do not drag if we're within tolerance from origin
 291                 }
 292                 // Once the user has moved farther than tolerance from the original location
 293                 // (indicating they intend to draw, not click), then always process the
 294                 // motion notify coordinates as given (no snapping back to origin)
 295                 event_context->within_tolerance = false;
 296
 297                 NR::Point const motion_w(event->motion.x, event->motion.y);
 298                 NR::Point const motion_dt(event_context->desktop->w2d(motion_w));
 299                 sp_spiral_drag(sc, motion_dt, event->motion.state);
 300                 ret = TRUE;
 301             }
 302             break;
 303         case GDK_BUTTON_RELEASE:
 304             event_context->xp = event_context->yp = 0;
 305             if (event->button.button == 1) {
 306                 dragging = FALSE;
 307                 if (!event_context->within_tolerance) {
 308                     // we've been dragging, finish the spiral
 309                     sp_spiral_finish(sc);
 310                 } else if (event_context->item_to_select) {
 311                     // no dragging, select clicked item if any
 312                     if (event->button.state & GDK_SHIFT_MASK) {
 313                         selection->toggle(event_context->item_to_select);
 314                     } else {
 315                         selection->set(event_context->item_to_select);
 316                     }
 317                 } else {
 318                     // click in an empty space
 319                     selection->clear();
 320                 }
 321
 322                 event_context->item_to_select = NULL;
 323                 ret = TRUE;
 324                 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
 325             }
 326             break;
 327         case GDK_KEY_PRESS:
 328             switch (get_group0_keyval(&event->key)) {
 329                 case GDK_Alt_R:
 330                 case GDK_Control_L:
 331                 case GDK_Control_R:
 332                 case GDK_Shift_L:
 333                 case GDK_Shift_R:
 334                 case GDK_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
 335                 case GDK_Meta_R:
 336                     sp_event_show_modifier_tip(event_context->defaultMessageContext(), event,
 337                                                _("<b>Ctrl</b>: snap angle"),
 338                                                NULL,
 339                                                _("<b>Alt</b>: lock spiral radius"));
 340                     break;
 341                 case GDK_Up:
 342                 case GDK_Down:
 343                 case GDK_KP_Up:
 344                 case GDK_KP_Down:
 345                     // prevent the zoom field from activation
 346                     if (!MOD__CTRL_ONLY)
 347                         ret = TRUE;
 348                     break;
 349                 case GDK_x:
 350                 case GDK_X:
 351                     if (MOD__ALT_ONLY) {
 352                         desktop->setToolboxFocusTo ("altx-spiral");
 353                         ret = TRUE;
 354                     }
 355                     break;
 356                 case GDK_Escape:
 357                     sp_desktop_selection(desktop)->clear();
 358                     //TODO: make dragging escapable by Esc
 359                 default:
 360                     break;
 361             }
 362             break;
 363         case GDK_KEY_RELEASE:
 364             switch (get_group0_keyval(&event->key)) {
 365                 case GDK_Alt_L:
 366                 case GDK_Alt_R:
 367                 case GDK_Control_L:
 368                 case GDK_Control_R:
 369                 case GDK_Shift_L:
 370                 case GDK_Shift_R:
 371                 case GDK_Meta_L:  // Meta is when you press Shift+Alt
 372                 case GDK_Meta_R:
 373                     event_context->defaultMessageContext()->clear();
 374                     break;
 375                 default:
 376                     break;
 377             }
 378             break;
 379         default:
 380             break;
 381     }
 382
 383     if (!ret) {
 384         if (((SPEventContextClass *) parent_class)->root_handler)
 385             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 386     }
 387
 388     return ret;
 389 }
 390
 391 static void
 392 sp_spiral_drag(SPSpiralContext *sc, NR::Point p, guint state)
 393 {
 394     SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
 395
 396     int const snaps = prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12);
 397
 398     if (!sc->item) {
 399
 400         if (Inkscape::have_viable_layer(desktop, sc->_message_context) == false) {
 401             return;
 402         }
 403
 404         /* Create object */
 405         Inkscape::XML::Node *repr = sp_repr_new("svg:path");
 406         repr->setAttribute("sodipodi:type", "spiral");
 407
 408         /* Set style */
 409         sp_desktop_apply_style_tool(desktop, repr, "tools.shapes.spiral", false);
 410
 411         sc->item = (SPItem *) desktop->currentLayer()->appendChildRepr(repr);
 412         Inkscape::GC::release(repr);
 413         sc->item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
 414         sc->item->updateRepr();
 415     }
 416
 417     NR::Point const p0 = sp_desktop_dt2root_xy_point(desktop, sc->center);
 418     NR::Point p1 = sp_desktop_dt2root_xy_point(desktop, p);
 419     SnapManager const &m = desktop->namedview->snap_manager;
 420     p1 = m.freeSnap(Inkscape::Snapper::SNAP_POINT, p1, sc->item).getPoint();
 421
 422     SPSpiral *spiral = SP_SPIRAL(sc->item);
 423
 424     NR::Point const delta = p1 - p0;
 425     gdouble const rad = NR::L2(delta);
 426
 427     gdouble arg = NR::atan2(delta) - 2.0*M_PI*spiral->revo;
 428
 429     if (state & GDK_CONTROL_MASK) {
 430         arg = sp_round(arg, M_PI/snaps);
 431     }
 432
 433     /* Fixme: these parameters should be got from dialog box */
 434     sp_spiral_position_set(spiral, p0[NR::X], p0[NR::Y],
 435                            /*expansion*/ sc->exp,
 436                            /*revolution*/ sc->revo,
 437                            rad, arg,
 438                            /*t0*/ sc->t0);
 439
 440     /* status text */
 441     GString *rads = SP_PX_TO_METRIC_STRING(rad, desktop->namedview->getDefaultMetric());
 442     sc->_message_context->setF(Inkscape::NORMAL_MESSAGE,
 443                                _("<b>Spiral</b>: radius %s, angle %5g&#176;; with <b>Ctrl</b> to snap angle"),
 444                                rads->str, sp_round((arg + 2.0*M_PI*spiral->revo)*180/M_PI, 0.0001));
 445     g_string_free(rads, FALSE);
 446 }
 447
 448 static void
 449 sp_spiral_finish(SPSpiralContext *sc)
 450 {
 451     sc->_message_context->clear();
 452
 453     if (sc->item != NULL) {
 454         SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
 455         SPSpiral  *spiral = SP_SPIRAL(sc->item);
 456
 457         sp_shape_set_shape(SP_SHAPE(spiral));
 458         SP_OBJECT(spiral)->updateRepr(NULL, SP_OBJECT_WRITE_EXT);
 459
 460         sp_desktop_selection(desktop)->set(sc->item);
 461         sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_SPIRAL,
 462                          /* TODO: annotate */ "spiral-context.cpp:462");
 463
 464         sc->item = NULL;
 465     }
 466 }
 467
 468
 469 /*
 470   Local Variables:
 471   mode:c++
 472   c-file-style:"stroustrup"
 473   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 474   indent-tabs-mode:nil
 475   fill-column:99
 476   End:
 477 */
 478 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :