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 "snap.h"
  34 #include "desktop.h"
  35 #include "desktop-style.h"
  36 #include "message-context.h"
  37 #include "pixmaps/cursor-star.xpm"
  38 #include "sp-metrics.h"
  39 #include <glibmm/i18n.h>
  40 #include "preferences.h"
  41 #include "xml/repr.h"
  42 #include "xml/node-event-vector.h"
  43 #include "object-edit.h"
  44 #include "context-fns.h"
  45 #include "shape-editor.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, Inkscape::Preferences::Entry *val);
  55 static gint sp_star_context_root_handler (SPEventContext *ec, GdkEvent *event);
  56
  57 static void sp_star_drag (SPStarContext * sc, Geom::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     star_context->item = NULL;
 112
 113     star_context->magnitude = 5;
 114     star_context->proportion = 0.5;
 115     star_context->isflatsided = false;
 116
 117     new (&star_context->sel_changed_connection) sigc::connection();
 118 }
 119
 120 static void
 121 sp_star_context_dispose (GObject *object)
 122 {
 123     SPEventContext *ec = SP_EVENT_CONTEXT (object);
 124     SPStarContext *sc = SP_STAR_CONTEXT (object);
 125
 126     ec->enableGrDrag(false);
 127
 128     sc->sel_changed_connection.disconnect();
 129     sc->sel_changed_connection.~connection();
 130
 131     delete ec->shape_editor;
 132     ec->shape_editor = NULL;
 133
 134     /* fixme: This is necessary because we do not grab */
 135     if (sc->item) sp_star_finish (sc);
 136
 137     if (sc->_message_context) {
 138         delete sc->_message_context;
 139     }
 140
 141     G_OBJECT_CLASS (parent_class)->dispose (object);
 142 }
 143
 144 /**
 145 \brief  Callback that processes the "changed" signal on the selection;
 146 destroys old and creates new knotholder
 147 \param  selection Should not be NULL.
 148 */
 149 void
 150 sp_star_context_selection_changed (Inkscape::Selection * selection, gpointer data)
 151 {
 152     g_assert (selection != NULL);
 153
 154     SPStarContext *sc = SP_STAR_CONTEXT (data);
 155     SPEventContext *ec = SP_EVENT_CONTEXT (sc);
 156
 157     ec->shape_editor->unset_item(SH_KNOTHOLDER);
 158     SPItem *item = selection->singleItem();
 159     ec->shape_editor->set_item(item, SH_KNOTHOLDER);
 160 }
 161
 162 static void
 163 sp_star_context_setup (SPEventContext *ec)
 164 {
 165    SPStarContext *sc = SP_STAR_CONTEXT (ec);
 166
 167     if (((SPEventContextClass *) parent_class)->setup)
 168         ((SPEventContextClass *) parent_class)->setup (ec);
 169
 170     sp_event_context_read (ec, "magnitude");
 171     sp_event_context_read (ec, "proportion");
 172     sp_event_context_read (ec, "isflatsided");
 173     sp_event_context_read (ec, "rounded");
 174     sp_event_context_read (ec, "randomized");
 175
 176     ec->shape_editor = new ShapeEditor(ec->desktop);
 177
 178     SPItem *item = sp_desktop_selection(ec->desktop)->singleItem();
 179     if (item) {
 180         ec->shape_editor->set_item(item, SH_KNOTHOLDER);
 181     }
 182
 183     Inkscape::Selection *selection = sp_desktop_selection(ec->desktop);
 184     sc->sel_changed_connection.disconnect();
 185     sc->sel_changed_connection = selection->connectChanged(sigc::bind(sigc::ptr_fun(&sp_star_context_selection_changed), (gpointer)sc));
 186
 187     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 188     if (prefs->getBool("/tools/shapes/selcue")) {
 189         ec->enableSelectionCue();
 190     }
 191
 192     if (prefs->getBool("/tools/shapes/gradientdrag")) {
 193         ec->enableGrDrag();
 194     }
 195
 196     sc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 197 }
 198
 199 static void
 200 sp_star_context_set (SPEventContext *ec, Inkscape::Preferences::Entry *val)
 201 {
 202     SPStarContext *sc = SP_STAR_CONTEXT (ec);
 203     Glib::ustring path = val->getEntryName();
 204
 205     if (path == "magnitude") {
 206         sc->magnitude = CLAMP (val->getInt(5), 3, 1024);
 207     } else if (path == "proportion") {
 208         sc->proportion = CLAMP (val->getDouble(0.5), 0.01, 2.0);
 209     } else if (path == "isflatsided") {
 210         sc->isflatsided = val->getBool();
 211     } else if (path == "rounded") {
 212         sc->rounded = val->getDouble();
 213     } else if (path == "randomized") {
 214         sc->randomized = val->getDouble();
 215     }
 216 }
 217
 218 static gint sp_star_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 219 {
 220     static gboolean dragging;
 221
 222     SPDesktop *desktop = event_context->desktop;
 223     Inkscape::Selection *selection = sp_desktop_selection (desktop);
 224     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 225
 226     SPStarContext *sc = SP_STAR_CONTEXT (event_context);
 227
 228     event_context->tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
 229
 230     gint ret = FALSE;
 231
 232     switch (event->type) {
 233     case GDK_BUTTON_PRESS:
 234         if (event->button.button == 1 && !event_context->space_panning) {
 235
 236             dragging = TRUE;
 237             sp_event_context_snap_window_open(event_context);
 238
 239             sc->center = Inkscape::setup_for_drag_start(desktop, event_context, event);
 240
 241             /* Snap center */
 242             SnapManager &m = desktop->namedview->snap_manager;
 243             m.setup(desktop, true);
 244             Geom::Point pt2g = to_2geom(sc->center);
 245             m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, pt2g, Inkscape::SNAPSOURCE_HANDLE);
 246             sc->center = from_2geom(pt2g);
 247
 248             sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 249                                 GDK_KEY_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
 250                                 GDK_POINTER_MOTION_MASK |
 251                                 GDK_POINTER_MOTION_HINT_MASK |
 252                                 GDK_BUTTON_PRESS_MASK,
 253                                 NULL, event->button.time);
 254             ret = TRUE;
 255         }
 256         break;
 257     case GDK_MOTION_NOTIFY:
 258         if (dragging && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning) {
 259
 260             if ( event_context->within_tolerance
 261                  && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 262                  && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 263                 break; // do not drag if we're within tolerance from origin
 264             }
 265             // Once the user has moved farther than tolerance from the original location
 266             // (indicating they intend to draw, not click), then always process the
 267             // motion notify coordinates as given (no snapping back to origin)
 268             event_context->within_tolerance = false;
 269
 270             Geom::Point const motion_w(event->motion.x, event->motion.y);
 271             Geom::Point motion_dt(desktop->w2d(motion_w));
 272
 273             sp_star_drag (sc, motion_dt, event->motion.state);
 274
 275             gobble_motion_events(GDK_BUTTON1_MASK);
 276
 277             ret = TRUE;
 278         }
 279         break;
 280     case GDK_BUTTON_RELEASE:
 281         event_context->xp = event_context->yp = 0;
 282         if (event->button.button == 1 && !event_context->space_panning) {
 283             dragging = FALSE;
 284             sp_event_context_snap_window_closed(event_context, false); //button release will also occur on a double-click; in that case suppress warnings
 285             if (!event_context->within_tolerance) {
 286                 // we've been dragging, finish the star
 287                 sp_star_finish (sc);
 288             } else if (event_context->item_to_select) {
 289                 // no dragging, select clicked item if any
 290                 if (event->button.state & GDK_SHIFT_MASK) {
 291                     selection->toggle(event_context->item_to_select);
 292                 } else {
 293                     selection->set(event_context->item_to_select);
 294                 }
 295             } else {
 296                 // click in an empty space
 297                 selection->clear();
 298             }
 299
 300             event_context->item_to_select = NULL;
 301             ret = TRUE;
 302             sp_canvas_item_ungrab(SP_CANVAS_ITEM (desktop->acetate), event->button.time);
 303         }
 304         break;
 305     case GDK_KEY_PRESS:
 306         switch (get_group0_keyval(&event->key)) {
 307         case GDK_Alt_R:
 308         case GDK_Control_L:
 309         case GDK_Control_R:
 310         case GDK_Shift_L:
 311         case GDK_Shift_R:
 312         case GDK_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
 313         case GDK_Meta_R:
 314             sp_event_show_modifier_tip(event_context->defaultMessageContext(), event,
 315                                        _("<b>Ctrl</b>: snap angle; keep rays radial"),
 316                                        NULL,
 317                                        NULL);
 318             break;
 319         case GDK_Up:
 320         case GDK_Down:
 321         case GDK_KP_Up:
 322         case GDK_KP_Down:
 323             // prevent the zoom field from activation
 324             if (!MOD__CTRL_ONLY)
 325                 ret = TRUE;
 326             break;
 327         case GDK_x:
 328         case GDK_X:
 329             if (MOD__ALT_ONLY) {
 330                 desktop->setToolboxFocusTo ("altx-star");
 331                 ret = TRUE;
 332             }
 333             break;
 334         case GDK_Escape:
 335             sp_desktop_selection(desktop)->clear();
 336             //TODO: make dragging escapable by Esc
 337             break;
 338
 339         case GDK_space:
 340             if (dragging) {
 341                 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
 342                                       event->button.time);
 343                 dragging = false;
 344                 sp_event_context_snap_window_closed(event_context);
 345                 if (!event_context->within_tolerance) {
 346                     // we've been dragging, finish the rect
 347                     sp_star_finish(sc);
 348                 }
 349                 // do not return true, so that space would work switching to selector
 350             }
 351             break;
 352
 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 sp_star_drag(SPStarContext *sc, Geom::Point p, guint state)
 386 {
 387     SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
 388
 389     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 390     int const snaps = prefs->getInt("/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::Document *xml_doc = sp_document_repr_doc(SP_EVENT_CONTEXT_DOCUMENT(sc));
 400         Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
 401         repr->setAttribute("sodipodi:type", "star");
 402
 403         /* Set style */
 404         sp_desktop_apply_style_tool(desktop, repr, "/tools/shapes/star", false);
 405
 406         sc->item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 407         Inkscape::GC::release(repr);
 408         sc->item->transform = sp_item_i2doc_affine(SP_ITEM(desktop->currentLayer())).inverse();
 409         sc->item->updateRepr();
 410
 411         sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 412     }
 413
 414     /* Snap corner point with no constraints */
 415     SnapManager &m = desktop->namedview->snap_manager;
 416     m.setup(desktop, true, sc->item);
 417     Geom::Point pt2g = to_2geom(p);
 418     m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, pt2g, Inkscape::SNAPSOURCE_HANDLE);
 419
 420     Geom::Point const p0 = desktop->dt2doc(sc->center);
 421     Geom::Point const p1 = desktop->dt2doc(pt2g);
 422
 423     SPStar *star = SP_STAR(sc->item);
 424
 425     double const sides = (gdouble) sc->magnitude;
 426     Geom::Point const d = p1 - p0;
 427     Geom::Coord const r1 = Geom::L2(d);
 428     double arg1 = atan2(from_2geom(d));
 429
 430     if (state & GDK_CONTROL_MASK) {
 431         /* Snap angle */
 432         arg1 = sp_round(arg1, M_PI / snaps);
 433     }
 434
 435     sp_star_position_set(star, sc->magnitude, from_2geom(p0), r1, r1 * sc->proportion,
 436                          arg1, arg1 + M_PI / sides, sc->isflatsided, sc->rounded, sc->randomized);
 437
 438     /* status text */
 439     GString *rads = SP_PX_TO_METRIC_STRING(r1, desktop->namedview->getDefaultMetric());
 440     sc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE,
 441                                ( sc->isflatsided?
 442                                  _("<b>Polygon</b>: radius %s, angle %5g&#176;; with <b>Ctrl</b> to snap angle")
 443                                  : _("<b>Star</b>: radius %s, angle %5g&#176;; with <b>Ctrl</b> to snap angle") ),
 444                                rads->str, sp_round((arg1) * 180 / M_PI, 0.0001));
 445
 446     g_string_free(rads, FALSE);
 447 }
 448
 449 static void
 450 sp_star_finish (SPStarContext * sc)
 451 {
 452     sc->_message_context->clear();
 453
 454     if (sc->item != NULL) {
 455         SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
 456         SPObject *object = SP_OBJECT(sc->item);
 457
 458         sp_shape_set_shape(SP_SHAPE(sc->item));
 459
 460         object->updateRepr(SP_OBJECT_WRITE_EXT);
 461
 462         sp_canvas_end_forced_full_redraws(desktop->canvas);
 463
 464         sp_desktop_selection(desktop)->set(sc->item);
 465         sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_STAR,
 466                          _("Create star"));
 467
 468         sc->item = NULL;
 469     }
 470 }
 471
 472 /*
 473   Local Variables:
 474   mode:c++
 475   c-file-style:"stroustrup"
 476   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 477   indent-tabs-mode:nil
 478   fill-column:99
 479   End:
 480 */
 481 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :