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         delete 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         delete 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             /* Snap center */
 284             SnapManager &m = desktop->namedview->snap_manager;
 285             m.setup(desktop, true);
 286             Geom::Point pt2g = to_2geom(sc->center);
 287             m.freeSnapReturnByRef(Inkscape::Snapper::SNAPPOINT_NODE, pt2g);
 288             sc->center = from_2geom(pt2g);
 289
 290             sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 291                                 GDK_KEY_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
 292                                 GDK_POINTER_MOTION_MASK |
 293                                 GDK_POINTER_MOTION_HINT_MASK |
 294                                 GDK_BUTTON_PRESS_MASK,
 295                                 NULL, event->button.time);
 296             ret = TRUE;
 297         }
 298         break;
 299     case GDK_MOTION_NOTIFY:
 300         if (dragging && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning) {
 301
 302             if ( event_context->within_tolerance
 303                  && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 304                  && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 305                 break; // do not drag if we're within tolerance from origin
 306             }
 307             // Once the user has moved farther than tolerance from the original location
 308             // (indicating they intend to draw, not click), then always process the
 309             // motion notify coordinates as given (no snapping back to origin)
 310             event_context->within_tolerance = false;
 311
 312             NR::Point const motion_w(event->motion.x, event->motion.y);
 313             NR::Point motion_dt(desktop->w2d(motion_w));
 314
 315             sp_star_drag (sc, motion_dt, event->motion.state);
 316
 317             gobble_motion_events(GDK_BUTTON1_MASK);
 318
 319             ret = TRUE;
 320         }
 321         break;
 322     case GDK_BUTTON_RELEASE:
 323         event_context->xp = event_context->yp = 0;
 324         if (event->button.button == 1 && !event_context->space_panning) {
 325             dragging = FALSE;
 326             if (!event_context->within_tolerance) {
 327                 // we've been dragging, finish the star
 328                 sp_star_finish (sc);
 329             } else if (event_context->item_to_select) {
 330                 // no dragging, select clicked item if any
 331                 if (event->button.state & GDK_SHIFT_MASK) {
 332                     selection->toggle(event_context->item_to_select);
 333                 } else {
 334                     selection->set(event_context->item_to_select);
 335                 }
 336             } else {
 337                 // click in an empty space
 338                 selection->clear();
 339             }
 340
 341             event_context->item_to_select = NULL;
 342             ret = TRUE;
 343             sp_canvas_item_ungrab(SP_CANVAS_ITEM (desktop->acetate), event->button.time);
 344         }
 345         break;
 346     case GDK_KEY_PRESS:
 347         switch (get_group0_keyval(&event->key)) {
 348         case GDK_Alt_R:
 349         case GDK_Control_L:
 350         case GDK_Control_R:
 351         case GDK_Shift_L:
 352         case GDK_Shift_R:
 353         case GDK_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
 354         case GDK_Meta_R:
 355             sp_event_show_modifier_tip(event_context->defaultMessageContext(), event,
 356                                        _("<b>Ctrl</b>: snap angle; keep rays radial"),
 357                                        NULL,
 358                                        NULL);
 359             break;
 360         case GDK_Up:
 361         case GDK_Down:
 362         case GDK_KP_Up:
 363         case GDK_KP_Down:
 364             // prevent the zoom field from activation
 365             if (!MOD__CTRL_ONLY)
 366                 ret = TRUE;
 367             break;
 368         case GDK_x:
 369         case GDK_X:
 370             if (MOD__ALT_ONLY) {
 371                 desktop->setToolboxFocusTo ("altx-star");
 372                 ret = TRUE;
 373             }
 374             break;
 375         case GDK_Escape:
 376             sp_desktop_selection(desktop)->clear();
 377             //TODO: make dragging escapable by Esc
 378             break;
 379
 380         case GDK_space:
 381             if (dragging) {
 382                 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
 383                                       event->button.time);
 384                 dragging = false;
 385                 if (!event_context->within_tolerance) {
 386                     // we've been dragging, finish the rect
 387                     sp_star_finish(sc);
 388                 }
 389                 // do not return true, so that space would work switching to selector
 390             }
 391             break;
 392
 393         default:
 394             break;
 395         }
 396         break;
 397     case GDK_KEY_RELEASE:
 398         switch (get_group0_keyval (&event->key)) {
 399         case GDK_Alt_L:
 400         case GDK_Alt_R:
 401         case GDK_Control_L:
 402         case GDK_Control_R:
 403         case GDK_Shift_L:
 404         case GDK_Shift_R:
 405         case GDK_Meta_L:  // Meta is when you press Shift+Alt
 406         case GDK_Meta_R:
 407             event_context->defaultMessageContext()->clear();
 408             break;
 409         default:
 410             break;
 411         }
 412         break;
 413     default:
 414         break;
 415     }
 416
 417     if (!ret) {
 418         if (((SPEventContextClass *) parent_class)->root_handler)
 419             ret = ((SPEventContextClass *) parent_class)->root_handler (event_context, event);
 420     }
 421
 422     return ret;
 423 }
 424
 425 static void sp_star_drag(SPStarContext *sc, NR::Point p, guint state)
 426 {
 427     SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
 428
 429     int const snaps = prefs_get_int_attribute ("options.rotationsnapsperpi", "value", 12);
 430
 431     if (!sc->item) {
 432
 433         if (Inkscape::have_viable_layer(desktop, sc->_message_context) == false) {
 434             return;
 435         }
 436
 437         /* Create object */
 438         Inkscape::XML::Document *xml_doc = sp_document_repr_doc(SP_EVENT_CONTEXT_DOCUMENT(sc));
 439         Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
 440         repr->setAttribute("sodipodi:type", "star");
 441
 442         /* Set style */
 443         sp_desktop_apply_style_tool(desktop, repr, "tools.shapes.star", false);
 444
 445         sc->item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 446         Inkscape::GC::release(repr);
 447         sc->item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
 448         sc->item->updateRepr();
 449
 450         sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
 451     }
 452
 453     /* Snap corner point with no constraints */
 454     SnapManager &m = desktop->namedview->snap_manager;
 455     m.setup(desktop, true, sc->item);
 456     Geom::Point pt2g = to_2geom(p);
 457     m.freeSnapReturnByRef(Inkscape::Snapper::SNAPPOINT_NODE, pt2g);
 458
 459     Geom::Point const p0 = to_2geom(sp_desktop_dt2root_xy_point(desktop, sc->center));
 460     Geom::Point const p1 = to_2geom(sp_desktop_dt2root_xy_point(desktop, from_2geom(pt2g)));
 461
 462     SPStar *star = SP_STAR(sc->item);
 463
 464     double const sides = (gdouble) sc->magnitude;
 465     Geom::Point const d = p1 - p0;
 466     Geom::Coord const r1 = Geom::L2(d);
 467     double arg1 = atan2(from_2geom(d));
 468
 469     if (state & GDK_CONTROL_MASK) {
 470         /* Snap angle */
 471         arg1 = sp_round(arg1, M_PI / snaps);
 472     }
 473
 474     sp_star_position_set(star, sc->magnitude, from_2geom(p0), r1, r1 * sc->proportion,
 475                          arg1, arg1 + M_PI / sides, sc->isflatsided, sc->rounded, sc->randomized);
 476
 477     /* status text */
 478     GString *rads = SP_PX_TO_METRIC_STRING(r1, desktop->namedview->getDefaultMetric());
 479     sc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE,
 480                                ( sc->isflatsided?
 481                                  _("<b>Polygon</b>: radius %s, angle %5g&#176;; with <b>Ctrl</b> to snap angle")
 482                                  : _("<b>Star</b>: radius %s, angle %5g&#176;; with <b>Ctrl</b> to snap angle") ),
 483                                rads->str, sp_round((arg1) * 180 / M_PI, 0.0001));
 484
 485     g_string_free(rads, FALSE);
 486 }
 487
 488 static void
 489 sp_star_finish (SPStarContext * sc)
 490 {
 491     sc->_message_context->clear();
 492
 493     if (sc->item != NULL) {
 494         SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
 495         SPObject *object = SP_OBJECT(sc->item);
 496
 497         sp_shape_set_shape(SP_SHAPE(sc->item));
 498
 499         object->updateRepr(SP_OBJECT_WRITE_EXT);
 500
 501         sp_canvas_end_forced_full_redraws(desktop->canvas);
 502
 503         sp_desktop_selection(desktop)->set(sc->item);
 504         sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_STAR,
 505                          _("Create star"));
 506
 507         sc->item = NULL;
 508     }
 509 }
 510
 511 /*
 512   Local Variables:
 513   mode:c++
 514   c-file-style:"stroustrup"
 515   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 516   indent-tabs-mode:nil
 517   fill-column:99
 518   End:
 519 */
 520 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :