/** @file * @brief Ellipse drawing context */ /* Authors: * Mitsuru Oka * Lauris Kaplinski <lauris@kaplinski.com> * bulia byak <buliabyak@users.sf.net> * Johan Engelen <johan@shouraizou.nl> * * Copyright (C) 2000-2006 Authors * Copyright (C) 2000-2001 Ximian, Inc. * * Released under GNU GPL, read the file 'COPYING' for more information */ #define __SP_ARC_CONTEXT_C__ #ifdef HAVE_CONFIG_H # include <config.h> #endif #include <gdk/gdkkeysyms.h> #include "macros.h" #include <glibmm/i18n.h> #include "display/sp-canvas.h" #include "sp-ellipse.h" #include "document.h" #include "sp-namedview.h" #include "selection.h" #include "desktop-handles.h" #include "snap.h" #include "pixmaps/cursor-ellipse.xpm" #include "sp-metrics.h" #include "xml/repr.h" #include "xml/node-event-vector.h" #include "object-edit.h" #include "preferences.h" #include "message-context.h" #include "desktop.h" #include "desktop-style.h" #include "context-fns.h" #include "verbs.h" #include "shape-editor.h" #include "event-context.h" #include "arc-context.h" static void sp_arc_context_class_init(SPArcContextClass *klass); static void sp_arc_context_init(SPArcContext *arc_context); static void sp_arc_context_dispose(GObject *object); static void sp_arc_context_setup(SPEventContext *ec); static void sp_arc_context_finish(SPEventContext *ec); static gint sp_arc_context_root_handler(SPEventContext *event_context, GdkEvent *event); static gint sp_arc_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event); static void sp_arc_drag(SPArcContext *ec, Geom::Point pt, guint state); static void sp_arc_finish(SPArcContext *ec); static void sp_arc_cancel(SPArcContext *ec); static SPEventContextClass *parent_class; GtkType sp_arc_context_get_type() { static GType type = 0; if (!type) { GTypeInfo info = { sizeof(SPArcContextClass), NULL, NULL, (GClassInitFunc) sp_arc_context_class_init, NULL, NULL, sizeof(SPArcContext), 4, (GInstanceInitFunc) sp_arc_context_init, NULL, /* value_table */ }; type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPArcContext", &info, (GTypeFlags) 0); } return type; } static void sp_arc_context_class_init(SPArcContextClass *klass) { GObjectClass *object_class = (GObjectClass *) klass; SPEventContextClass *event_context_class = (SPEventContextClass *) klass; parent_class = (SPEventContextClass*) g_type_class_peek_parent(klass); object_class->dispose = sp_arc_context_dispose; event_context_class->setup = sp_arc_context_setup; event_context_class->finish = sp_arc_context_finish; event_context_class->root_handler = sp_arc_context_root_handler; event_context_class->item_handler = sp_arc_context_item_handler; } static void sp_arc_context_init(SPArcContext *arc_context) { SPEventContext *event_context = SP_EVENT_CONTEXT(arc_context); event_context->cursor_shape = cursor_ellipse_xpm; event_context->hot_x = 4; event_context->hot_y = 4; event_context->xp = 0; event_context->yp = 0; event_context->tolerance = 0; event_context->within_tolerance = false; event_context->item_to_select = NULL; arc_context->item = NULL; new (&arc_context->sel_changed_connection) sigc::connection(); } static void sp_arc_context_finish(SPEventContext *ec) { SPArcContext *ac = SP_ARC_CONTEXT(ec); SPDesktop *desktop = ec->desktop; sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), GDK_CURRENT_TIME); sp_arc_finish(ac); ac->sel_changed_connection.disconnect(); if (((SPEventContextClass *) parent_class)->finish) { ((SPEventContextClass *) parent_class)->finish(ec); } } static void sp_arc_context_dispose(GObject *object) { SPEventContext *ec = SP_EVENT_CONTEXT(object); SPArcContext *ac = SP_ARC_CONTEXT(object); ec->enableGrDrag(false); ac->sel_changed_connection.disconnect(); ac->sel_changed_connection.~connection(); delete ec->shape_editor; ec->shape_editor = NULL; /* fixme: This is necessary because we do not grab */ if (ac->item) { sp_arc_finish(ac); } delete ac->_message_context; G_OBJECT_CLASS(parent_class)->dispose(object); } /** \brief Callback that processes the "changed" signal on the selection; destroys old and creates new knotholder. */ 00157 void sp_arc_context_selection_changed(Inkscape::Selection * selection, gpointer data) { SPArcContext *ac = SP_ARC_CONTEXT(data); SPEventContext *ec = SP_EVENT_CONTEXT(ac); ec->shape_editor->unset_item(SH_KNOTHOLDER); SPItem *item = selection->singleItem(); ec->shape_editor->set_item(item, SH_KNOTHOLDER); } static void sp_arc_context_setup(SPEventContext *ec) { SPArcContext *ac = SP_ARC_CONTEXT(ec); Inkscape::Selection *selection = sp_desktop_selection(ec->desktop); if (((SPEventContextClass *) parent_class)->setup) { ((SPEventContextClass *) parent_class)->setup(ec); } ec->shape_editor = new ShapeEditor(ec->desktop); SPItem *item = sp_desktop_selection(ec->desktop)->singleItem(); if (item) { ec->shape_editor->set_item(item, SH_KNOTHOLDER); } ac->sel_changed_connection.disconnect(); ac->sel_changed_connection = selection->connectChanged( sigc::bind(sigc::ptr_fun(&sp_arc_context_selection_changed), (gpointer) ac) ); Inkscape::Preferences *prefs = Inkscape::Preferences::get(); if (prefs->getBool("/tools/shapes/selcue")) { ec->enableSelectionCue(); } if (prefs->getBool("/tools/shapes/gradientdrag")) { ec->enableGrDrag(); } ac->_message_context = new Inkscape::MessageContext(ec->desktop->messageStack()); } static gint sp_arc_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event) { SPDesktop *desktop = event_context->desktop; gint ret = FALSE; switch (event->type) { case GDK_BUTTON_PRESS: if (event->button.button == 1 && !event_context->space_panning) { Inkscape::setup_for_drag_start(desktop, event_context, event); ret = TRUE; } break; // motion and release are always on root (why?) default: break; } if (((SPEventContextClass *) parent_class)->item_handler) { ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event); } return ret; } static gint sp_arc_context_root_handler(SPEventContext *event_context, GdkEvent *event) { static bool dragging; SPDesktop *desktop = event_context->desktop; Inkscape::Selection *selection = sp_desktop_selection(desktop); SPArcContext *ac = SP_ARC_CONTEXT(event_context); Inkscape::Preferences *prefs = Inkscape::Preferences::get(); event_context->tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100); gint ret = FALSE; switch (event->type) { case GDK_BUTTON_PRESS: if (event->button.button == 1 && !event_context->space_panning) { dragging = true; ac->center = Inkscape::setup_for_drag_start(desktop, event_context, event); /* Snap center */ SnapManager &m = desktop->namedview->snap_manager; m.setup(desktop); Geom::Point pt2g = to_2geom(ac->center); m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, pt2g, Inkscape::SNAPSOURCE_HANDLE); ac->center = from_2geom(pt2g); sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate), GDK_KEY_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK, NULL, event->button.time); ret = TRUE; } break; case GDK_MOTION_NOTIFY: if (dragging && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning) { if ( event_context->within_tolerance && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance ) && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) { break; // do not drag if we're within tolerance from origin } // Once the user has moved farther than tolerance from the original location // (indicating they intend to draw, not click), then always process the // motion notify coordinates as given (no snapping back to origin) event_context->within_tolerance = false; Geom::Point const motion_w(event->motion.x, event->motion.y); Geom::Point motion_dt(desktop->w2d(motion_w)); sp_arc_drag(ac, motion_dt, event->motion.state); gobble_motion_events(GDK_BUTTON1_MASK); ret = TRUE; } break; case GDK_BUTTON_RELEASE: event_context->xp = event_context->yp = 0; if (event->button.button == 1 && !event_context->space_panning) { dragging = false; sp_event_context_discard_delayed_snap_event(event_context); if (!event_context->within_tolerance) { // we've been dragging, finish the arc sp_arc_finish(ac); } else if (event_context->item_to_select) { // no dragging, select clicked item if any if (event->button.state & GDK_SHIFT_MASK) { selection->toggle(event_context->item_to_select); } else { selection->set(event_context->item_to_select); } } else { // click in an empty space selection->clear(); } event_context->xp = 0; event_context->yp = 0; event_context->item_to_select = NULL; ret = TRUE; } sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time); break; case GDK_KEY_PRESS: switch (get_group0_keyval (&event->key)) { case GDK_Alt_L: case GDK_Alt_R: case GDK_Control_L: case GDK_Control_R: case GDK_Shift_L: case GDK_Shift_R: case GDK_Meta_L: // Meta is when you press Shift+Alt (at least on my machine) case GDK_Meta_R: if (!dragging) { sp_event_show_modifier_tip(event_context->defaultMessageContext(), event, _("<b>Ctrl</b>: make circle or integer-ratio ellipse, snap arc/segment angle"), _("<b>Shift</b>: draw around the starting point"), NULL); } break; case GDK_Up: case GDK_Down: case GDK_KP_Up: case GDK_KP_Down: // prevent the zoom field from activation if (!MOD__CTRL_ONLY) ret = TRUE; break; case GDK_x: case GDK_X: if (MOD__ALT_ONLY) { desktop->setToolboxFocusTo ("altx-arc"); ret = TRUE; } break; case GDK_Escape: if (dragging) { dragging = false; sp_event_context_discard_delayed_snap_event(event_context); // if drawing, cancel, otherwise pass it up for deselecting sp_arc_cancel(ac); ret = TRUE; } break; case GDK_space: if (dragging) { sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time); dragging = false; sp_event_context_discard_delayed_snap_event(event_context); if (!event_context->within_tolerance) { // we've been dragging, finish the arc sp_arc_finish(ac); } // do not return true, so that space would work switching to selector } break; default: break; } break; case GDK_KEY_RELEASE: switch (event->key.keyval) { case GDK_Alt_L: case GDK_Alt_R: case GDK_Control_L: case GDK_Control_R: case GDK_Shift_L: case GDK_Shift_R: case GDK_Meta_L: // Meta is when you press Shift+Alt case GDK_Meta_R: event_context->defaultMessageContext()->clear(); break; default: break; } break; default: break; } if (!ret) { if (((SPEventContextClass *) parent_class)->root_handler) { ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event); } } return ret; } static void sp_arc_drag(SPArcContext *ac, Geom::Point pt, guint state) { SPDesktop *desktop = SP_EVENT_CONTEXT(ac)->desktop; if (!ac->item) { if (Inkscape::have_viable_layer(desktop, ac->_message_context) == false) { return; } /* Create object */ Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc()); Inkscape::XML::Node *repr = xml_doc->createElement("svg:path"); repr->setAttribute("sodipodi:type", "arc"); /* Set style */ sp_desktop_apply_style_tool(desktop, repr, "/tools/shapes/arc", false); ac->item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr)); Inkscape::GC::release(repr); ac->item->transform = sp_item_i2doc_affine(SP_ITEM(desktop->currentLayer())).inverse(); ac->item->updateRepr(); sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5); } bool ctrl_save = false; if ((state & GDK_MOD1_MASK) && (state & GDK_CONTROL_MASK) && !(state & GDK_SHIFT_MASK)) { // if Alt is pressed without Shift in addition to Control, temporarily drop the CONTROL mask // so that the ellipse is not constrained to integer ratios ctrl_save = true; state = state ^ GDK_CONTROL_MASK; } Geom::Rect r = Inkscape::snap_rectangular_box(desktop, ac->item, pt, ac->center, state); if (ctrl_save) { state = state ^ GDK_CONTROL_MASK; } Geom::Point dir = r.dimensions() / 2; if (state & GDK_MOD1_MASK) { /* With Alt let the ellipse pass through the mouse pointer */ Geom::Point c = r.midpoint(); if (!ctrl_save) { if (fabs(dir[Geom::X]) > 1E-6 && fabs(dir[Geom::Y]) > 1E-6) { Geom::Matrix const i2d (sp_item_i2d_affine (ac->item)); Geom::Point new_dir = pt * i2d - c; new_dir[Geom::X] *= dir[Geom::Y] / dir[Geom::X]; double lambda = new_dir.length() / dir[Geom::Y]; r = Geom::Rect (c - lambda*dir, c + lambda*dir); } } else { /* with Alt+Ctrl (without Shift) we generate a perfect circle with diameter click point <--> mouse pointer */ double l = dir.length(); Geom::Point d (l, l); r = Geom::Rect (c - d, c + d); } } sp_arc_position_set(SP_ARC(ac->item), r.midpoint()[Geom::X], r.midpoint()[Geom::Y], r.dimensions()[Geom::X] / 2, r.dimensions()[Geom::Y] / 2); double rdimx = r.dimensions()[Geom::X]; double rdimy = r.dimensions()[Geom::Y]; GString *xs = SP_PX_TO_METRIC_STRING(rdimx, desktop->namedview->getDefaultMetric()); GString *ys = SP_PX_TO_METRIC_STRING(rdimy, desktop->namedview->getDefaultMetric()); if (state & GDK_CONTROL_MASK) { int ratio_x, ratio_y; if (fabs (rdimx) > fabs (rdimy)) { ratio_x = (int) rint (rdimx / rdimy); ratio_y = 1; } else { ratio_x = 1; ratio_y = (int) rint (rdimy / rdimx); } ac->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, _("<b>Ellipse</b>: %s × %s (constrained to ratio %d:%d); with <b>Shift</b> to draw around the starting point"), xs->str, ys->str, ratio_x, ratio_y); } else { ac->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, _("<b>Ellipse</b>: %s × %s; with <b>Ctrl</b> to make square or integer-ratio ellipse; with <b>Shift</b> to draw around the starting point"), xs->str, ys->str); } g_string_free(xs, FALSE); g_string_free(ys, FALSE); } static void sp_arc_finish(SPArcContext *ac) { ac->_message_context->clear(); if (ac->item != NULL) { SPGenericEllipse *ge = SP_GENERICELLIPSE(SP_ARC(ac->item)); if (ge->rx.computed == 0 || ge->ry.computed == 0) { sp_arc_cancel(ac); // Don't allow the creating of zero sized arc, for example when the start and and point snap to the snap grid point return; } SPDesktop *desktop = SP_EVENT_CONTEXT(ac)->desktop; SP_OBJECT(ac->item)->updateRepr(); sp_canvas_end_forced_full_redraws(desktop->canvas); sp_desktop_selection(desktop)->set(ac->item); sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_ARC, _("Create ellipse")); ac->item = NULL; } } static void sp_arc_cancel(SPArcContext *ac) { SPDesktop *desktop = SP_EVENT_CONTEXT(ac)->desktop; sp_desktop_selection(desktop)->clear(); sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), 0); if (ac->item != NULL) { SP_OBJECT(ac->item)->deleteObject(); ac->item = NULL; } ac->within_tolerance = false; ac->xp = 0; ac->yp = 0; ac->item_to_select = NULL; sp_canvas_end_forced_full_redraws(desktop->canvas); sp_document_cancel(sp_desktop_document(desktop)); } /* Local Variables: mode:c++ c-file-style:"stroustrup" c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +)) indent-tabs-mode:nil fill-column:99 End: */ // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :