/** \file * Pencil event context implementation. */ /* * Authors: * Lauris Kaplinski <lauris@kaplinski.com> * bulia byak <buliabyak@users.sf.net> * * Copyright (C) 2000 Lauris Kaplinski * Copyright (C) 2000-2001 Ximian, Inc. * Copyright (C) 2002 Lauris Kaplinski * Copyright (C) 2004 Monash University * * Released under GNU GPL, read the file 'COPYING' for more information */ #include <gdk/gdkkeysyms.h> #include "pencil-context.h" #include "desktop.h" #include "desktop-handles.h" #include "selection.h" #include "selection-chemistry.h" #include "draw-anchor.h" #include "message-stack.h" #include "message-context.h" #include "modifier-fns.h" #include "sp-path.h" #include "preferences.h" #include "snap.h" #include "pixmaps/cursor-pencil.xpm" #include <2geom/sbasis-to-bezier.h> #include <2geom/bezier-utils.h> #include "display/canvas-bpath.h" #include <glibmm/i18n.h> #include "libnr/in-svg-plane.h" #include "context-fns.h" #include "sp-namedview.h" #include "xml/repr.h" #include "document.h" #include "desktop-style.h" #include "macros.h" #include "display/curve.h" #include "livarot/Path.h" static void sp_pencil_context_class_init(SPPencilContextClass *klass); static void sp_pencil_context_init(SPPencilContext *pc); static void sp_pencil_context_setup(SPEventContext *ec); static void sp_pencil_context_dispose(GObject *object); static gint sp_pencil_context_root_handler(SPEventContext *event_context, GdkEvent *event); static gint pencil_handle_button_press(SPPencilContext *const pc, GdkEventButton const &bevent); static gint pencil_handle_motion_notify(SPPencilContext *const pc, GdkEventMotion const &mevent); static gint pencil_handle_button_release(SPPencilContext *const pc, GdkEventButton const &revent); static gint pencil_handle_key_press(SPPencilContext *const pc, guint const keyval, guint const state); static gint pencil_handle_key_release(SPPencilContext *const pc, guint const keyval, guint const state); static void spdc_set_startpoint(SPPencilContext *pc, Geom::Point const p); static void spdc_set_endpoint(SPPencilContext *pc, Geom::Point const p); static void spdc_finish_endpoint(SPPencilContext *pc); static void spdc_add_freehand_point(SPPencilContext *pc, Geom::Point p, guint state); static void fit_and_split(SPPencilContext *pc); static void interpolate(SPPencilContext *pc); static void sketch_interpolate(SPPencilContext *pc); static SPDrawContextClass *pencil_parent_class; static Geom::Point pencil_drag_origin_w(0, 0); static bool pencil_within_tolerance = false; /** * Register SPPencilContext class with Gdk and return its type number. */ GType 00075 sp_pencil_context_get_type() { static GType type = 0; if (!type) { GTypeInfo info = { sizeof(SPPencilContextClass), NULL, NULL, (GClassInitFunc) sp_pencil_context_class_init, NULL, NULL, sizeof(SPPencilContext), 4, (GInstanceInitFunc) sp_pencil_context_init, NULL, /* value_table */ }; type = g_type_register_static(SP_TYPE_DRAW_CONTEXT, "SPPencilContext", &info, (GTypeFlags)0); } return type; } /** * Initialize SPPencilContext vtable. */ static void 00098 sp_pencil_context_class_init(SPPencilContextClass *klass) { GObjectClass *object_class; SPEventContextClass *event_context_class; object_class = (GObjectClass *) klass; event_context_class = (SPEventContextClass *) klass; pencil_parent_class = (SPDrawContextClass*)g_type_class_peek_parent(klass); object_class->dispose = sp_pencil_context_dispose; event_context_class->setup = sp_pencil_context_setup; event_context_class->root_handler = sp_pencil_context_root_handler; } /** * Callback to initialize SPPencilContext object. */ static void 00118 sp_pencil_context_init(SPPencilContext *pc) { SPEventContext *event_context = SP_EVENT_CONTEXT(pc); event_context->cursor_shape = cursor_pencil_xpm; event_context->hot_x = 4; event_context->hot_y = 4; pc->npoints = 0; pc->state = SP_PENCIL_CONTEXT_IDLE; pc->req_tangent = Geom::Point(0, 0); // since SPPencilContext is not properly constructed... pc->sketch_interpolation = Geom::Piecewise<Geom::D2<Geom::SBasis> >(); pc->sketch_n = 0; } /** * Callback to setup SPPencilContext object. */ static void 00139 sp_pencil_context_setup(SPEventContext *ec) { Inkscape::Preferences *prefs = Inkscape::Preferences::get(); if (prefs->getBool("/tools/freehand/pencil/selcue")) { ec->enableSelectionCue(); } if (((SPEventContextClass *) pencil_parent_class)->setup) { ((SPEventContextClass *) pencil_parent_class)->setup(ec); } SPPencilContext *const pc = SP_PENCIL_CONTEXT(ec); pc->is_drawing = false; pc->anchor_statusbar = false; } static void sp_pencil_context_dispose(GObject *object) { G_OBJECT_CLASS(pencil_parent_class)->dispose(object); } /** Snaps new node relative to the previous node. */ static void 00164 spdc_endpoint_snap(SPPencilContext const *pc, Geom::Point &p, guint const state) { if ((state & GDK_CONTROL_MASK)) { //CTRL enables constrained snapping spdc_endpoint_snap_rotation(pc, p, pc->p[0], state); } else { if (!(state & GDK_SHIFT_MASK)) { //SHIFT disables all snapping, except the angular snapping above //After all, the user explicitely asked for angular snapping by //pressing CTRL spdc_endpoint_snap_free(pc, p, state); } } } /** * Callback for handling all pencil context events. */ gint 00181 sp_pencil_context_root_handler(SPEventContext *const ec, GdkEvent *event) { SPPencilContext *const pc = SP_PENCIL_CONTEXT(ec); gint ret = FALSE; switch (event->type) { case GDK_BUTTON_PRESS: ret = pencil_handle_button_press(pc, event->button); break; case GDK_MOTION_NOTIFY: ret = pencil_handle_motion_notify(pc, event->motion); break; case GDK_BUTTON_RELEASE: ret = pencil_handle_button_release(pc, event->button); break; case GDK_KEY_PRESS: ret = pencil_handle_key_press(pc, get_group0_keyval (&event->key), event->key.state); break; case GDK_KEY_RELEASE: ret = pencil_handle_key_release(pc, get_group0_keyval (&event->key), event->key.state); break; default: break; } if (!ret) { gint (*const parent_root_handler)(SPEventContext *, GdkEvent *) = ((SPEventContextClass *) pencil_parent_class)->root_handler; if (parent_root_handler) { ret = parent_root_handler(ec, event); } } return ret; } static gint pencil_handle_button_press(SPPencilContext *const pc, GdkEventButton const &bevent) { gint ret = FALSE; SPEventContext *event_context = SP_EVENT_CONTEXT(pc); if ( bevent.button == 1 && !event_context->space_panning) { SPDrawContext *dc = SP_DRAW_CONTEXT (pc); SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc); Inkscape::Selection *selection = sp_desktop_selection(desktop); if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) { return TRUE; } Geom::Point const button_w(bevent.x, bevent.y); /* Find desktop coordinates */ Geom::Point p = pc->desktop->w2d(button_w); /* Test whether we hit any anchor. */ SPDrawAnchor *anchor = spdc_test_inside(pc, button_w); pencil_drag_origin_w = Geom::Point(bevent.x,bevent.y); pencil_within_tolerance = true; switch (pc->state) { case SP_PENCIL_CONTEXT_ADDLINE: /* Current segment will be finished with release */ ret = TRUE; break; default: /* Set first point of sequence */ SnapManager &m = desktop->namedview->snap_manager; m.setup(desktop); if (anchor) { p = anchor->dp; desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path")); } else { if (!(bevent.state & GDK_SHIFT_MASK)) { // This is the first click of a new curve; deselect item so that // this curve is not combined with it (unless it is drawn from its // anchor, which is handled by the sibling branch above) selection->clear(); desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path")); m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, p, Inkscape::SNAPSOURCE_HANDLE); } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) { desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path")); m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, p, Inkscape::SNAPSOURCE_HANDLE); } } pc->sa = anchor; spdc_set_startpoint(pc, p); ret = TRUE; break; } pc->is_drawing = true; } return ret; } static gint 00288 pencil_handle_motion_notify(SPPencilContext *const pc, GdkEventMotion const &mevent) { SPDesktop *const dt = pc->desktop; if ((mevent.state & GDK_CONTROL_MASK) && (mevent.state & GDK_BUTTON1_MASK)) { // mouse was accidentally moved during Ctrl+click; // ignore the motion and create a single point pc->is_drawing = false; return TRUE; } gint ret = FALSE; SPEventContext *event_context = SP_EVENT_CONTEXT(pc); if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) { // allow scrolling return FALSE; } if ( ( mevent.state & GDK_BUTTON1_MASK ) && !pc->grab && pc->is_drawing) { /* Grab mouse, so release will not pass unnoticed */ pc->grab = SP_CANVAS_ITEM(dt->acetate); sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK ), NULL, mevent.time); } /* Find desktop coordinates */ Geom::Point p = dt->w2d(Geom::Point(mevent.x, mevent.y)); /* Test whether we hit any anchor. */ SPDrawAnchor *anchor = spdc_test_inside(pc, Geom::Point(mevent.x, mevent.y)); if (pencil_within_tolerance) { Inkscape::Preferences *prefs = Inkscape::Preferences::get(); gint const tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100); if ( Geom::LInfty( Geom::Point(mevent.x,mevent.y) - pencil_drag_origin_w ) < tolerance ) { return FALSE; // 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 move the object, not click), then always process the // motion notify coordinates as given (no snapping back to origin) pencil_within_tolerance = false; switch (pc->state) { case SP_PENCIL_CONTEXT_ADDLINE: /* Set red endpoint */ if (anchor) { p = anchor->dp; } else { Geom::Point ptnr(p); spdc_endpoint_snap(pc, ptnr, mevent.state); p = ptnr; } spdc_set_endpoint(pc, p); ret = TRUE; break; default: /* We may be idle or already freehand */ if ( mevent.state & GDK_BUTTON1_MASK && pc->is_drawing ) { if (pc->state == SP_PENCIL_CONTEXT_IDLE) { sp_event_context_discard_delayed_snap_event(event_context); } pc->state = SP_PENCIL_CONTEXT_FREEHAND; if ( !pc->sa && !pc->green_anchor ) { /* Create green anchor */ pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, pc->p[0]); } /** \todo * fixme: I am not sure whether we want to snap to anchors * in middle of freehand (Lauris) */ if (anchor) { p = anchor->dp; } if ( pc->npoints != 0) { // buttonpress may have happened before we entered draw context! spdc_add_freehand_point(pc, p, mevent.state); ret = TRUE; } if (anchor && !pc->anchor_statusbar) { pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Release</b> here to close and finish the path.")); pc->anchor_statusbar = true; } else if (!anchor && pc->anchor_statusbar) { pc->_message_context->clear(); pc->anchor_statusbar = false; } else if (!anchor) { pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("Drawing a freehand path")); } } else { if (anchor && !pc->anchor_statusbar) { pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Drag</b> to continue the path from this point.")); pc->anchor_statusbar = true; } else if (!anchor && pc->anchor_statusbar) { pc->_message_context->clear(); pc->anchor_statusbar = false; } } break; } return ret; } static gint 00397 pencil_handle_button_release(SPPencilContext *const pc, GdkEventButton const &revent) { gint ret = FALSE; SPEventContext *event_context = SP_EVENT_CONTEXT(pc); if ( revent.button == 1 && pc->is_drawing && !event_context->space_panning) { SPDesktop *const dt = pc->desktop; pc->is_drawing = false; /* Find desktop coordinates */ Geom::Point p = dt->w2d(Geom::Point(revent.x, revent.y)); /* Test whether we hit any anchor. */ SPDrawAnchor *anchor = spdc_test_inside(pc, Geom::Point(revent.x, revent.y)); switch (pc->state) { case SP_PENCIL_CONTEXT_IDLE: /* Releasing button in idle mode means single click */ /* We have already set up start point/anchor in button_press */ pc->state = SP_PENCIL_CONTEXT_ADDLINE; ret = TRUE; break; case SP_PENCIL_CONTEXT_ADDLINE: /* Finish segment now */ if (anchor) { p = anchor->dp; } else { spdc_endpoint_snap(pc, p, revent.state); } pc->ea = anchor; spdc_set_endpoint(pc, p); spdc_finish_endpoint(pc); pc->state = SP_PENCIL_CONTEXT_IDLE; sp_event_context_discard_delayed_snap_event(event_context); ret = TRUE; break; case SP_PENCIL_CONTEXT_FREEHAND: if (revent.state & GDK_MOD1_MASK) { /* sketch mode: interpolate the sketched path and improve the current output path with the new interpolation. don't finish sketch */ sketch_interpolate(pc); if (pc->green_anchor) { pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor); } pc->state = SP_PENCIL_CONTEXT_SKETCH; } else { /* Finish segment now */ /// \todo fixme: Clean up what follows (Lauris) if (anchor) { p = anchor->dp; } pc->ea = anchor; /* Write curves to object */ dt->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Finishing freehand")); interpolate(pc); spdc_concat_colors_and_flush(pc, FALSE); pc->sa = NULL; pc->ea = NULL; if (pc->green_anchor) { pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor); } pc->state = SP_PENCIL_CONTEXT_IDLE; // reset sketch mode too pc->sketch_n = 0; } ret = TRUE; break; case SP_PENCIL_CONTEXT_SKETCH: default: break; } if (pc->grab) { /* Release grab now */ sp_canvas_item_ungrab(pc->grab, revent.time); pc->grab = NULL; } ret = TRUE; } return ret; } static void pencil_cancel (SPPencilContext *const pc) { if (pc->grab) { /* Release grab now */ sp_canvas_item_ungrab(pc->grab, 0); pc->grab = NULL; } pc->is_drawing = false; pc->state = SP_PENCIL_CONTEXT_IDLE; sp_event_context_discard_delayed_snap_event(SP_EVENT_CONTEXT(pc)); pc->red_curve->reset(); sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL); while (pc->green_bpaths) { gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data)); pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data); } pc->green_curve->reset(); if (pc->green_anchor) { pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor); } pc->_message_context->clear(); pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled")); sp_canvas_end_forced_full_redraws(pc->desktop->canvas); } static gint pencil_handle_key_press(SPPencilContext *const pc, guint const keyval, guint const state) { gint ret = FALSE; switch (keyval) { case GDK_Up: case GDK_Down: case GDK_KP_Up: case GDK_KP_Down: // Prevent the zoom field from activation. if (!mod_ctrl_only(state)) { ret = TRUE; } break; case GDK_Escape: if (pc->npoints != 0) { // if drawing, cancel, otherwise pass it up for deselecting if (pc->state != SP_PENCIL_CONTEXT_IDLE) { pencil_cancel (pc); ret = TRUE; } } break; case GDK_z: case GDK_Z: if (mod_ctrl_only(state) && pc->npoints != 0) { // if drawing, cancel, otherwise pass it up for undo if (pc->state != SP_PENCIL_CONTEXT_IDLE) { pencil_cancel (pc); ret = TRUE; } } break; case GDK_g: case GDK_G: if (mod_shift_only(state)) { sp_selection_to_guides(SP_EVENT_CONTEXT(pc)->desktop); ret = true; } break; case GDK_Alt_L: case GDK_Alt_R: case GDK_Meta_L: case GDK_Meta_R: if (pc->state == SP_PENCIL_CONTEXT_IDLE) { pc->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("<b>Sketch mode</b>: holding <b>Alt</b> interpolates between sketched paths. Release <b>Alt</b> to finalize.")); } break; default: break; } return ret; } static gint pencil_handle_key_release(SPPencilContext *const pc, guint const keyval, guint const /*state*/) { gint ret = FALSE; switch (keyval) { case GDK_Alt_L: case GDK_Alt_R: case GDK_Meta_L: case GDK_Meta_R: if (pc->state == SP_PENCIL_CONTEXT_SKETCH) { spdc_concat_colors_and_flush(pc, FALSE); pc->sketch_n = 0; pc->sa = NULL; pc->ea = NULL; if (pc->green_anchor) { pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor); } pc->state = SP_PENCIL_CONTEXT_IDLE; sp_event_context_discard_delayed_snap_event(SP_EVENT_CONTEXT(pc)); pc->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Finishing freehand sketch")); ret = TRUE; } break; default: break; } return ret; } /** * Reset points and set new starting point. */ static void 00603 spdc_set_startpoint(SPPencilContext *const pc, Geom::Point const p) { pc->npoints = 0; pc->red_curve_is_valid = false; if (in_svg_plane(p)) { pc->p[pc->npoints++] = p; } } /** * Change moving endpoint position. * <ul> * <li>Ctrl constrains to moving to H/V direction, snapping in given direction. * <li>Otherwise we snap freely to whatever attractors are available. * </ul> * * Number of points is (re)set to 2 always, 2nd point is modified. * We change RED curve. */ static void 00623 spdc_set_endpoint(SPPencilContext *const pc, Geom::Point const p) { if (pc->npoints == 0) { return; /* May occur if first point wasn't in SVG plane (e.g. weird w2d transform, perhaps from bad * zoom setting). */ } g_return_if_fail( pc->npoints > 0 ); pc->red_curve->reset(); if ( ( p == pc->p[0] ) || !in_svg_plane(p) ) { pc->npoints = 1; } else { pc->p[1] = p; pc->npoints = 2; pc->red_curve->moveto(pc->p[0]); pc->red_curve->lineto(pc->p[1]); pc->red_curve_is_valid = true; sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve); } } /** * Finalize addline. * * \todo * fixme: I'd like remove red reset from concat colors (lauris). * Still not sure, how it will make most sense. */ static void 00658 spdc_finish_endpoint(SPPencilContext *const pc) { if ( ( pc->red_curve->is_empty() ) || ( *(pc->red_curve->first_point()) == *(pc->red_curve->second_point()) ) ) { pc->red_curve->reset(); sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL); } else { /* Write curves to object. */ spdc_concat_colors_and_flush(pc, FALSE); pc->sa = NULL; pc->ea = NULL; } } static void spdc_add_freehand_point(SPPencilContext *pc, Geom::Point p, guint /*state*/) { g_assert( pc->npoints > 0 ); g_return_if_fail(unsigned(pc->npoints) < G_N_ELEMENTS(pc->p)); if ( ( p != pc->p[ pc->npoints - 1 ] ) && in_svg_plane(p) ) { pc->ps.push_back(p); pc->p[pc->npoints++] = p; fit_and_split(pc); } } static inline double square(double const x) { return x * x; } static void interpolate(SPPencilContext *pc) { if ( pc->ps.size() <= 1 ) { return; } Inkscape::Preferences *prefs = Inkscape::Preferences::get(); double const tol = prefs->getDoubleLimited("/tools/freehand/pencil/tolerance", 10.0, 1.0, 100.0) * 0.4; double const tolerance_sq = 0.02 * square( pc->desktop->w2d().descrim() * tol) * exp(0.2*tol - 2); g_assert(is_zero(pc->req_tangent) || is_unit_vector(pc->req_tangent)); Geom::Point const tHatEnd(0, 0); guint n_points = pc->ps.size(); pc->green_curve->reset(); pc->red_curve->reset(); pc->red_curve_is_valid = false; Geom::Point * b = g_new(Geom::Point, 4*n_points); Geom::Point * points = g_new(Geom::Point, 4*n_points); for (unsigned int i = 0; i < pc->ps.size(); i++) { points[i] = pc->ps[i]; } // worst case gives us a segment per point int max_segs = 4*n_points; int const n_segs = Geom::bezier_fit_cubic_r(b, points, n_points, tolerance_sq, max_segs); if ( n_segs > 0) { /* Fit and draw and reset state */ pc->green_curve->moveto(b[0]); for (int c = 0; c < n_segs; c++) { pc->green_curve->curveto(b[4*c+1], b[4*c+2], b[4*c+3]); } sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->green_curve); /* Fit and draw and copy last point */ g_assert(!pc->green_curve->is_empty()); /* Set up direction of next curve. */ { Geom::CubicBezier const * last_seg = dynamic_cast<Geom::CubicBezier const *>(pc->green_curve->last_segment()); g_assert( last_seg ); // Relevance: validity of (*last_seg)[2] pc->p[0] = last_seg->finalPoint(); pc->npoints = 1; Geom::Point const req_vec( pc->p[0] - (*last_seg)[2] ); pc->req_tangent = ( ( Geom::is_zero(req_vec) || !in_svg_plane(req_vec) ) ? Geom::Point(0, 0) : Geom::unit_vector(req_vec) ); } } g_free(b); g_free(points); pc->ps.clear(); } /* interpolates the sketched curve and tweaks the current sketch interpolation*/ static void sketch_interpolate(SPPencilContext *pc) { if ( pc->ps.size() <= 1 ) { return; } Inkscape::Preferences *prefs = Inkscape::Preferences::get(); double const tol = prefs->getDoubleLimited("/tools/freehand/pencil/tolerance", 10.0, 1.0, 100.0) * 0.4; double const tolerance_sq = 0.02 * square( pc->desktop->w2d().descrim() * tol) * exp(0.2*tol - 2); bool average_all_sketches = prefs->getBool("/tools/freehand/pencil/average_all_sketches", true); g_assert(is_zero(pc->req_tangent) || is_unit_vector(pc->req_tangent)); Geom::Point const tHatEnd(0, 0); guint n_points = pc->ps.size(); pc->red_curve->reset(); pc->red_curve_is_valid = false; Geom::Point * b = g_new(Geom::Point, 4*n_points); Geom::Point * points = g_new(Geom::Point, 4*n_points); for (unsigned i = 0; i < pc->ps.size(); i++) { points[i] = pc->ps[i]; } // worst case gives us a segment per point int max_segs = 4*n_points; int const n_segs = Geom::bezier_fit_cubic_r(b, points, n_points, tolerance_sq, max_segs); if ( n_segs > 0) { Geom::Path fit(b[0]); for (int c = 0; c < n_segs; c++) { fit.appendNew<Geom::CubicBezier>(b[4*c+1], b[4*c+2], b[4*c+3]); } Geom::Piecewise<Geom::D2<Geom::SBasis> > fit_pwd2 = fit.toPwSb(); double t =0.; if ( pc->sketch_n > 0 ) { if (average_all_sketches) { // Average = (sum of all) / n // = (sum of all + new one) / n+1 // = ((old average)*n + new one) / n+1 t = pc->sketch_n / (pc->sketch_n + 1.); } else { t = 0.5; } pc->sketch_interpolation = Geom::lerp(t, fit_pwd2, pc->sketch_interpolation); // simplify path, to eliminate small segments Path *path = new Path; path->LoadPathVector(Geom::path_from_piecewise(pc->sketch_interpolation, 0.01)); path->Simplify(0.5); Geom::PathVector *pathv = path->MakePathVector(); pc->sketch_interpolation = (*pathv)[0].toPwSb(); delete path; delete pathv; } else { pc->sketch_interpolation = fit_pwd2; } pc->sketch_n++; pc->green_curve->reset(); pc->green_curve->set_pathvector(Geom::path_from_piecewise(pc->sketch_interpolation, 0.01)); sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->green_curve); /* Fit and draw and copy last point */ g_assert(!pc->green_curve->is_empty()); /* Set up direction of next curve. */ { Geom::CubicBezier const * last_seg = dynamic_cast<Geom::CubicBezier const *>(pc->green_curve->last_segment()); g_assert( last_seg ); // Relevance: validity of (*last_seg)[2] pc->p[0] = last_seg->finalPoint(); pc->npoints = 1; Geom::Point const req_vec( pc->p[0] - (*last_seg)[2] ); pc->req_tangent = ( ( Geom::is_zero(req_vec) || !in_svg_plane(req_vec) ) ? Geom::Point(0, 0) : Geom::unit_vector(req_vec) ); } } g_free(b); g_free(points); pc->ps.clear(); } static void 00850 fit_and_split(SPPencilContext *pc) { g_assert( pc->npoints > 1 ); double const tolerance_sq = 0; Geom::Point b[4]; g_assert(is_zero(pc->req_tangent) || is_unit_vector(pc->req_tangent)); Geom::Point const tHatEnd(0, 0); int const n_segs = Geom::bezier_fit_cubic_full(b, NULL, pc->p, pc->npoints, pc->req_tangent, tHatEnd, tolerance_sq, 1); if ( n_segs > 0 && unsigned(pc->npoints) < G_N_ELEMENTS(pc->p) ) { /* Fit and draw and reset state */ pc->red_curve->reset(); pc->red_curve->moveto(b[0]); pc->red_curve->curveto(b[1], b[2], b[3]); sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve); pc->red_curve_is_valid = true; } else { /* Fit and draw and copy last point */ g_assert(!pc->red_curve->is_empty()); /* Set up direction of next curve. */ { Geom::CubicBezier const * last_seg = dynamic_cast<Geom::CubicBezier const *>(pc->red_curve->last_segment()); g_assert( last_seg ); // Relevance: validity of (*last_seg)[2] pc->p[0] = last_seg->finalPoint(); pc->npoints = 1; Geom::Point const req_vec( pc->p[0] - (*last_seg)[2] ); pc->req_tangent = ( ( Geom::is_zero(req_vec) || !in_svg_plane(req_vec) ) ? Geom::Point(0, 0) : Geom::unit_vector(req_vec) ); } pc->green_curve->append_continuous(pc->red_curve, 0.0625); SPCurve *curve = pc->red_curve->copy(); /// \todo fixme: SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve); curve->unref(); sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT); pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape); pc->red_curve_is_valid = false; } } /* 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 :