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 "spiral-context.h"
  35 #include "sp-metrics.h"
  36 #include <glibmm/i18n.h>
  37 #include "object-edit.h"
  38 #include "xml/repr.h"
  39 #include "xml/node-event-vector.h"
  40 #include "prefs-utils.h"
  41 #include "context-fns.h"
  42
  43 static void sp_spiral_context_class_init(SPSpiralContextClass * klass);
  44 static void sp_spiral_context_init(SPSpiralContext *spiral_context);
  45 static void sp_spiral_context_dispose(GObject *object);
  46 static void sp_spiral_context_setup(SPEventContext *ec);
  47 static void sp_spiral_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  48
  49 static gint sp_spiral_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  50
  51 static void sp_spiral_drag(SPSpiralContext *sc, NR::Point p, guint state);
  52 static void sp_spiral_finish(SPSpiralContext *sc);
  53
  54 static SPEventContextClass *parent_class;
  55
  56 GtkType
  57 sp_spiral_context_get_type()
  58 {
  59     static GType type = 0;
  60     if (!type) {
  61         GTypeInfo info = {
  62             sizeof(SPSpiralContextClass),
  63             NULL, NULL,
  64             (GClassInitFunc) sp_spiral_context_class_init,
  65             NULL, NULL,
  66             sizeof(SPSpiralContext),
  67             4,
  68             (GInstanceInitFunc) sp_spiral_context_init,
  69             NULL,    /* value_table */
  70         };
  71         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPSpiralContext", &info, (GTypeFlags)0);
  72     }
  73     return type;
  74 }
  75
  76 static void
  77 sp_spiral_context_class_init(SPSpiralContextClass *klass)
  78 {
  79     GObjectClass *object_class = (GObjectClass *) klass;
  80     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
  81
  82     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
  83
  84     object_class->dispose = sp_spiral_context_dispose;
  85
  86     event_context_class->setup = sp_spiral_context_setup;
  87     event_context_class->set = sp_spiral_context_set;
  88     event_context_class->root_handler = sp_spiral_context_root_handler;
  89 }
  90
  91 static void
  92 sp_spiral_context_init(SPSpiralContext *spiral_context)
  93 {
  94     SPEventContext *event_context = SP_EVENT_CONTEXT(spiral_context);
  95
  96     event_context->cursor_shape = cursor_spiral_xpm;
  97     event_context->hot_x = 4;
  98     event_context->hot_y = 4;
  99     event_context->xp = 0;
 100     event_context->yp = 0;
 101     event_context->tolerance = 0;
 102     event_context->within_tolerance = false;
 103     event_context->item_to_select = NULL;
 104
 105     event_context->shape_repr = NULL;
 106     event_context->shape_knot_holder = NULL;
 107
 108     spiral_context->item = NULL;
 109
 110     spiral_context->revo = 3.0;
 111     spiral_context->exp = 1.0;
 112     spiral_context->t0 = 0.0;
 113
 114     new (&spiral_context->sel_changed_connection) sigc::connection();
 115 }
 116
 117 static void
 118 sp_spiral_context_dispose(GObject *object)
 119 {
 120     SPSpiralContext *sc = SP_SPIRAL_CONTEXT(object);
 121     SPEventContext *ec = SP_EVENT_CONTEXT(object);
 122
 123     ec->enableGrDrag(false);
 124
 125     sc->sel_changed_connection.disconnect();
 126     sc->sel_changed_connection.~connection();
 127
 128     /* fixme: This is necessary because we do not grab */
 129     if (sc->item) sp_spiral_finish(sc);
 130
 131     if (ec->shape_knot_holder) {
 132         sp_knot_holder_destroy(ec->shape_knot_holder);
 133         ec->shape_knot_holder = NULL;
 134     }
 135
 136     if (ec->shape_repr) { // remove old listener
 137         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 138         Inkscape::GC::release(ec->shape_repr);
 139         ec->shape_repr = 0;
 140     }
 141
 142     if (sc->_message_context) {
 143         delete sc->_message_context;
 144     }
 145
 146     G_OBJECT_CLASS(parent_class)->dispose(object);
 147 }
 148
 149 static Inkscape::XML::NodeEventVector ec_shape_repr_events = {
 150     NULL, /* child_added */
 151     NULL, /* child_removed */
 152     ec_shape_event_attr_changed,
 153     NULL, /* content_changed */
 154     NULL  /* order_changed */
 155 };
 156
 157 /**
 158 \brief  Callback that processes the "changed" signal on the selection;
 159 destroys old and creates new knotholder
 160 */
 161 void
 162 sp_spiral_context_selection_changed(Inkscape::Selection *selection, gpointer data)
 163 {
 164     SPSpiralContext *sc = SP_SPIRAL_CONTEXT(data);
 165     SPEventContext *ec = SP_EVENT_CONTEXT(sc);
 166
 167     if (ec->shape_knot_holder) { // desktroy knotholder
 168         sp_knot_holder_destroy(ec->shape_knot_holder);
 169         ec->shape_knot_holder = NULL;
 170     }
 171
 172     if (ec->shape_repr) { // remove old listener
 173         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 174         Inkscape::GC::release(ec->shape_repr);
 175         ec->shape_repr = 0;
 176     }
 177
 178     SPItem *item = selection->singleItem();
 179     if (item) {
 180         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 181         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 182         if (shape_repr) {
 183             ec->shape_repr = shape_repr;
 184             Inkscape::GC::anchor(shape_repr);
 185             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 186         }
 187     }
 188 }
 189
 190 static void
 191 sp_spiral_context_setup(SPEventContext *ec)
 192 {
 193     SPSpiralContext *sc = SP_SPIRAL_CONTEXT(ec);
 194
 195     if (((SPEventContextClass *) parent_class)->setup)
 196         ((SPEventContextClass *) parent_class)->setup(ec);
 197
 198     sp_event_context_read(ec, "expansion");
 199     sp_event_context_read(ec, "revolution");
 200     sp_event_context_read(ec, "t0");
 201
 202     Inkscape::Selection *selection = sp_desktop_selection(ec->desktop);
 203
 204     SPItem *item = selection->singleItem();
 205     if (item) {
 206         ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
 207         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 208         if (shape_repr) {
 209             ec->shape_repr = shape_repr;
 210             Inkscape::GC::anchor(shape_repr);
 211             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 212         }
 213     }
 214
 215     sc->sel_changed_connection.disconnect();
 216     sc->sel_changed_connection = selection->connectChanged(sigc::bind(sigc::ptr_fun(&sp_spiral_context_selection_changed), (gpointer)sc));
 217
 218     if (prefs_get_int_attribute("tools.shapes", "selcue", 0) != 0) {
 219         ec->enableSelectionCue();
 220     }
 221
 222     if (prefs_get_int_attribute("tools.shapes", "gradientdrag", 0) != 0) {
 223         ec->enableGrDrag();
 224     }
 225
 226     sc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 227 }
 228
 229 static void
 230 sp_spiral_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 231 {
 232     SPSpiralContext *sc = SP_SPIRAL_CONTEXT(ec);
 233
 234     if (!strcmp(key, "expansion")) {
 235         sc->exp = (val) ? g_ascii_strtod(val, NULL) : 1.0;
 236         sc->exp = CLAMP(sc->exp, 0.0, 1000.0);
 237     } else if (!strcmp(key, "revolution")) {
 238         sc->revo = (val) ? g_ascii_strtod(val, NULL) : 3.0;
 239         sc->revo = CLAMP(sc->revo, 0.05, 40.0);
 240     } else if (!strcmp(key, "t0")) {
 241         sc->t0 = (val) ? g_ascii_strtod(val, NULL) : 0.0;
 242         sc->t0 = CLAMP(sc->t0, 0.0, 0.999);
 243     }
 244 }
 245
 246 static gint
 247 sp_spiral_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 248 {
 249     static gboolean dragging;
 250
 251     SPDesktop *desktop = event_context->desktop;
 252     Inkscape::Selection *selection = sp_desktop_selection (desktop);
 253     SPSpiralContext *sc = SP_SPIRAL_CONTEXT(event_context);
 254
 255     event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
 256
 257     gint ret = FALSE;
 258
 259     switch (event->type) {
 260         case GDK_BUTTON_PRESS:
 261             if (event->button.button == 1) {
 262
 263                 dragging = TRUE;
 264                 sc->center = Inkscape::setup_for_drag_start(desktop, event_context, event);
 265
 266                 SnapManager const m(desktop->namedview);
 267                 sc->center = m.freeSnap(Inkscape::Snapper::SNAP_POINT, sc->center, sc->item).getPoint();
 268
 269                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 270                                     ( GDK_KEY_PRESS_MASK |
 271                                       GDK_BUTTON_RELEASE_MASK |
 272                                       GDK_POINTER_MOTION_MASK |
 273                                       GDK_BUTTON_PRESS_MASK    ),
 274                                     NULL, event->button.time);
 275                 ret = TRUE;
 276             }
 277             break;
 278         case GDK_MOTION_NOTIFY:
 279             if (dragging && event->motion.state && GDK_BUTTON1_MASK) {
 280
 281                 if ( event_context->within_tolerance
 282                      && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 283                      && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 284                     break; // do not drag if we're within tolerance from origin
 285                 }
 286                 // Once the user has moved farther than tolerance from the original location
 287                 // (indicating they intend to draw, not click), then always process the
 288                 // motion notify coordinates as given (no snapping back to origin)
 289                 event_context->within_tolerance = false;
 290
 291                 NR::Point const motion_w(event->motion.x, event->motion.y);
 292                 NR::Point const motion_dt(event_context->desktop->w2d(motion_w));
 293                 sp_spiral_drag(sc, motion_dt, event->motion.state);
 294                 ret = TRUE;
 295             }
 296             break;
 297         case GDK_BUTTON_RELEASE:
 298             event_context->xp = event_context->yp = 0;
 299             if (event->button.button == 1) {
 300                 dragging = FALSE;
 301                 if (!event_context->within_tolerance) {
 302                     // we've been dragging, finish the spiral
 303                     sp_spiral_finish(sc);
 304                 } else if (event_context->item_to_select) {
 305                     // no dragging, select clicked item if any
 306                     if (event->button.state & GDK_SHIFT_MASK) {
 307                         selection->toggle(event_context->item_to_select);
 308                     } else {
 309                         selection->set(event_context->item_to_select);
 310                     }
 311                 } else {
 312                     // click in an empty space
 313                     selection->clear();
 314                 }
 315
 316                 event_context->item_to_select = NULL;
 317                 ret = TRUE;
 318                 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
 319             }
 320             break;
 321         case GDK_KEY_PRESS:
 322             switch (get_group0_keyval(&event->key)) {
 323                 case GDK_Alt_R:
 324                 case GDK_Control_L:
 325                 case GDK_Control_R:
 326                 case GDK_Shift_L:
 327                 case GDK_Shift_R:
 328                 case GDK_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
 329                 case GDK_Meta_R:
 330                     sp_event_show_modifier_tip(event_context->defaultMessageContext(), event,
 331                                                _("<b>Ctrl</b>: snap angle"),
 332                                                NULL,
 333                                                _("<b>Alt</b>: lock spiral radius"));
 334                     break;
 335                 case GDK_Up:
 336                 case GDK_Down:
 337                 case GDK_KP_Up:
 338                 case GDK_KP_Down:
 339                     // prevent the zoom field from activation
 340                     if (!MOD__CTRL_ONLY)
 341                         ret = TRUE;
 342                     break;
 343                 case GDK_x:
 344                 case GDK_X:
 345                     if (MOD__ALT_ONLY) {
 346                         desktop->setToolboxFocusTo ("altx-spiral");
 347                         ret = TRUE;
 348                     }
 349                     break;
 350                 case GDK_Escape:
 351                     sp_desktop_selection(desktop)->clear();
 352                     //TODO: make dragging escapable by Esc
 353                 default:
 354                     break;
 355             }
 356             break;
 357         case GDK_KEY_RELEASE:
 358             switch (get_group0_keyval(&event->key)) {
 359                 case GDK_Alt_L:
 360                 case GDK_Alt_R:
 361                 case GDK_Control_L:
 362                 case GDK_Control_R:
 363                 case GDK_Shift_L:
 364                 case GDK_Shift_R:
 365                 case GDK_Meta_L:  // Meta is when you press Shift+Alt
 366                 case GDK_Meta_R:
 367                     event_context->defaultMessageContext()->clear();
 368                     break;
 369                 default:
 370                     break;
 371             }
 372             break;
 373         default:
 374             break;
 375     }
 376
 377     if (!ret) {
 378         if (((SPEventContextClass *) parent_class)->root_handler)
 379             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 380     }
 381
 382     return ret;
 383 }
 384
 385 static void
 386 sp_spiral_drag(SPSpiralContext *sc, NR::Point p, guint state)
 387 {
 388     SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
 389
 390     int const snaps = prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12);
 391
 392     if (!sc->item) {
 393
 394         if (Inkscape::have_viable_layer(desktop, sc->_message_context) == false) {
 395             return;
 396         }
 397
 398         /* Create object */
 399         Inkscape::XML::Node *repr = sp_repr_new("svg:path");
 400         repr->setAttribute("sodipodi:type", "spiral");
 401
 402         /* Set style */
 403         sp_desktop_apply_style_tool(desktop, repr, "tools.shapes.spiral", false);
 404
 405         sc->item = (SPItem *) desktop->currentLayer()->appendChildRepr(repr);
 406         Inkscape::GC::release(repr);
 407         sc->item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
 408         sc->item->updateRepr();
 409     }
 410
 411     NR::Point const p0 = sp_desktop_dt2root_xy_point(desktop, sc->center);
 412     NR::Point p1 = sp_desktop_dt2root_xy_point(desktop, p);
 413     SnapManager const m(desktop->namedview);
 414     p1 = m.freeSnap(Inkscape::Snapper::SNAP_POINT, p1, sc->item).getPoint();
 415
 416     SPSpiral *spiral = SP_SPIRAL(sc->item);
 417
 418     NR::Point const delta = p1 - p0;
 419     gdouble const rad = NR::L2(delta);
 420
 421     gdouble arg = NR::atan2(delta) - 2.0*M_PI*spiral->revo;
 422
 423     if (state & GDK_CONTROL_MASK) {
 424         arg = sp_round(arg, M_PI/snaps);
 425     }
 426
 427     /* Fixme: these parameters should be got from dialog box */
 428     sp_spiral_position_set(spiral, p0[NR::X], p0[NR::Y],
 429                            /*expansion*/ sc->exp,
 430                            /*revolution*/ sc->revo,
 431                            rad, arg,
 432                            /*t0*/ sc->t0);
 433
 434     /* status text */
 435     GString *rads = SP_PX_TO_METRIC_STRING(rad, desktop->namedview->getDefaultMetric());
 436     sc->_message_context->setF(Inkscape::NORMAL_MESSAGE,
 437                                _("<b>Spiral</b>: radius %s, angle %5g&#176;; with <b>Ctrl</b> to snap angle"),
 438                                rads->str, sp_round((arg + 2.0*M_PI*spiral->revo)*180/M_PI, 0.0001));
 439     g_string_free(rads, FALSE);
 440 }
 441
 442 static void
 443 sp_spiral_finish(SPSpiralContext *sc)
 444 {
 445     sc->_message_context->clear();
 446
 447     if (sc->item != NULL) {
 448         SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
 449         SPSpiral  *spiral = SP_SPIRAL(sc->item);
 450
 451         sp_shape_set_shape(SP_SHAPE(spiral));
 452         SP_OBJECT(spiral)->updateRepr(NULL, SP_OBJECT_WRITE_EXT);
 453
 454         sp_desktop_selection(desktop)->set(sc->item);
 455         sp_document_done(sp_desktop_document(desktop));
 456
 457         sc->item = NULL;
 458     }
 459 }
 460
 461
 462 /*
 463   Local Variables:
 464   mode:c++
 465   c-file-style:"stroustrup"
 466   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 467   indent-tabs-mode:nil
 468   fill-column:99
 469   End:
 470 */
 471 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :