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Diffstat (limited to 'src/ui/tools/pencil-tool.cpp')
| -rw-r--r-- | src/ui/tools/pencil-tool.cpp | 952 |
1 files changed, 952 insertions, 0 deletions
diff --git a/src/ui/tools/pencil-tool.cpp b/src/ui/tools/pencil-tool.cpp new file mode 100644 index 000000000..ff14d61ec --- /dev/null +++ b/src/ui/tools/pencil-tool.cpp @@ -0,0 +1,952 @@ +/** \file + * Pencil event context implementation. + */ + +/* + * Authors: + * Lauris Kaplinski <lauris@kaplinski.com> + * bulia byak <buliabyak@users.sf.net> + * Jon A. Cruz <jon@joncruz.org> + * + * 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 "ui/tools/pencil-tool.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 "context-fns.h" +#include "sp-namedview.h" +#include "xml/repr.h" +#include "document.h" +#include "desktop-style.h" +#include "macros.h" +#include "display/sp-canvas.h" +#include "display/curve.h" +#include "livarot/Path.h" +#include "tool-factory.h" + +namespace Inkscape { +namespace UI { +namespace Tools { + +static gint pencil_handle_button_press(PencilTool *const pc, GdkEventButton const &bevent); +static gint pencil_handle_motion_notify(PencilTool *const pc, GdkEventMotion const &mevent); +static gint pencil_handle_button_release(PencilTool *const pc, GdkEventButton const &revent); +static gint pencil_handle_key_press(PencilTool *const pc, guint const keyval, guint const state); +static gint pencil_handle_key_release(PencilTool *const pc, guint const keyval, guint const state); + +static void spdc_set_startpoint(PencilTool *pc, Geom::Point const &p); +static void spdc_set_endpoint(PencilTool *pc, Geom::Point const &p); +static void spdc_finish_endpoint(PencilTool *pc); +static void spdc_add_freehand_point(PencilTool *pc, Geom::Point const &p, guint state); +static void fit_and_split(PencilTool *pc); +static void interpolate(PencilTool *pc); +static void sketch_interpolate(PencilTool *pc); + +static Geom::Point pencil_drag_origin_w(0, 0); +static bool pencil_within_tolerance = false; + +static bool in_svg_plane(Geom::Point const &p) { return Geom::LInfty(p) < 1e18; } + +namespace { + ToolBase* createPencilContext() { + return new PencilTool(); + } + + bool pencilContextRegistered = ToolFactory::instance().registerObject("/tools/freehand/pencil", createPencilContext); +} + +const std::string& PencilTool::getPrefsPath() { + return PencilTool::prefsPath; +} + +const std::string PencilTool::prefsPath = "/tools/freehand/pencil"; + +PencilTool::PencilTool() : + FreehandBase(), + p(), + npoints(0), + state(SP_PENCIL_CONTEXT_IDLE), + req_tangent(0,0), + is_drawing(false), + ps(), + sketch_interpolation(Geom::Piecewise<Geom::D2<Geom::SBasis> >())// since PencilTool is not properly constructed... +{ + this->cursor_shape = cursor_pencil_xpm; + this->hot_x = 4; + this->hot_y = 4; + this->sketch_n = 0; +} + +void PencilTool::setup() { + Inkscape::Preferences *prefs = Inkscape::Preferences::get(); + if (prefs->getBool("/tools/freehand/pencil/selcue")) { + this->enableSelectionCue(); + } + + FreehandBase::setup(); + + this->is_drawing = false; + this->anchor_statusbar = false; +} + +PencilTool::~PencilTool() { +} + +/** Snaps new node relative to the previous node. */ +static void +spdc_endpoint_snap(PencilTool const *pc, Geom::Point &p, guint const state) +{ + if ((state & GDK_CONTROL_MASK)) { //CTRL enables constrained snapping + if (pc->npoints > 0) { + 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 + boost::optional<Geom::Point> origin = pc->npoints > 0 ? pc->p[0] : boost::optional<Geom::Point>(); + spdc_endpoint_snap_free(pc, p, origin, state); + } + } +} + +/** + * Callback for handling all pencil context events. + */ +bool PencilTool::root_handler(GdkEvent* event) { + gint ret = FALSE; + + switch (event->type) { + case GDK_BUTTON_PRESS: + ret = pencil_handle_button_press(this, event->button); + break; + + case GDK_MOTION_NOTIFY: + ret = pencil_handle_motion_notify(this, event->motion); + break; + + case GDK_BUTTON_RELEASE: + ret = pencil_handle_button_release(this, event->button); + break; + + case GDK_KEY_PRESS: + ret = pencil_handle_key_press(this, get_group0_keyval (&event->key), event->key.state); + break; + + case GDK_KEY_RELEASE: + ret = pencil_handle_key_release(this, get_group0_keyval (&event->key), event->key.state); + break; + + default: + break; + } + + if (!ret) { + ret = FreehandBase::root_handler(event); + } + + return ret; +} + +static gint +pencil_handle_button_press(PencilTool *const pc, GdkEventButton const &bevent) +{ + gint ret = FALSE; + ToolBase *event_context = SP_EVENT_CONTEXT(pc); + if ( bevent.button == 1 && !event_context->space_panning) { + + FreehandBase *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; + } + + if (!pc->grab) { + /* Grab mouse, so release will not pass unnoticed */ + pc->grab = SP_CANVAS_ITEM(desktop->acetate); + sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK | + GDK_BUTTON_RELEASE_MASK | + GDK_POINTER_MOTION_MASK ), + NULL, bevent.time); + } + + 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; + + if (bevent.state & GDK_CONTROL_MASK) { + m.setup(desktop); + if (!(bevent.state & GDK_SHIFT_MASK)) { + m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_NODE_HANDLE); + } + spdc_create_single_dot(event_context, p, "/tools/freehand/pencil", bevent.state); + m.unSetup(); + ret = true; + break; + } + if (anchor) { + p = anchor->dp; + desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path")); + } else { + m.setup(desktop); + 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(p, Inkscape::SNAPSOURCE_NODE_HANDLE); + } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) { + desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path")); + m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_NODE_HANDLE); + } + m.unSetup(); + } + pc->sa = anchor; + spdc_set_startpoint(pc, p); + ret = TRUE; + break; + } + + pc->is_drawing = true; + } + return ret; +} + +static gint +pencil_handle_motion_notify(PencilTool *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; + + ToolBase *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]); + } + if (anchor) { + p = anchor->dp; + } + + if ( pc->npoints != 0) { // buttonpress may have happened before we entered draw context! + if (pc->ps.empty()) { + // Only in freehand mode we have to add the first point also to pc->ps (apparently) + // - We cannot add this point in spdc_set_startpoint, because we only need it for freehand + // - We cannot do this in the button press handler because at that point we don't know yet + // wheter we're going into freehand mode or not + pc->ps.push_back(pc->p[0]); + } + 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; + } + } + + // Show the pre-snap indicator to communicate to the user where we would snap to if he/she were to + // a) press the mousebutton to start a freehand drawing, or + // b) release the mousebutton to finish a freehand drawing + if (!sp_event_context_knot_mouseover(pc)) { + SnapManager &m = dt->namedview->snap_manager; + m.setup(dt); + m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE)); + m.unSetup(); + } + break; + } + return ret; +} + +static gint +pencil_handle_button_release(PencilTool *const pc, GdkEventButton const &revent) +{ + gint ret = FALSE; + + ToolBase *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 */ + if (!(revent.state & GDK_CONTROL_MASK)) { + // Ctrl+click creates a single point so only set context in ADDLINE mode when Ctrl isn't pressed + 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; + } else { + Geom::Point p_end = p; + spdc_endpoint_snap(pc, p_end, revent.state); + if (p_end != p) { + // then we must have snapped! + spdc_add_freehand_point(pc, p_end, revent.state); + } + } + + 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 (PencilTool *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) { + sp_canvas_item_destroy(SP_CANVAS_ITEM(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")); + + pc->desktop->canvas->endForcedFullRedraws(); +} + +static gint +pencil_handle_key_press(PencilTool *const pc, guint const keyval, guint const state) +{ + gint ret = FALSE; + switch (keyval) { + case GDK_KEY_Up: + case GDK_KEY_Down: + case GDK_KEY_KP_Up: + case GDK_KEY_KP_Down: + // Prevent the zoom field from activation. + if (!mod_ctrl_only(state)) { + ret = TRUE; + } + break; + case GDK_KEY_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_KEY_z: + case GDK_KEY_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_KEY_g: + case GDK_KEY_G: + if (mod_shift_only(state)) { + sp_selection_to_guides(SP_EVENT_CONTEXT(pc)->desktop); + ret = true; + } + break; + case GDK_KEY_Alt_L: + case GDK_KEY_Alt_R: + case GDK_KEY_Meta_L: + case GDK_KEY_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(PencilTool *const pc, guint const keyval, guint const /*state*/) +{ + gint ret = FALSE; + switch (keyval) { + case GDK_KEY_Alt_L: + case GDK_KEY_Alt_R: + case GDK_KEY_Meta_L: + case GDK_KEY_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 +spdc_set_startpoint(PencilTool *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 +spdc_set_endpoint(PencilTool *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 +spdc_finish_endpoint(PencilTool *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(PencilTool *pc, Geom::Point const &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(PencilTool *pc) +{ + if ( pc->ps.size() <= 1 ) { + return; + } + + //BSpline + using Geom::X; + using Geom::Y; + //BSpline end + + 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]); + //BSpline + Inkscape::Preferences *prefs = Inkscape::Preferences::get(); + guint mode = prefs->getInt("/tools/freehand/pencil/freehand-mode", 0); + //BSpline End + for (int c = 0; c < n_segs; c++) { + //BSpline + //Si el modo es BSpline modificamos para que el trazado cree los nodos adhoc + if(mode == 2){ + Geom::Point BP = b[4*c+0] + (1./3)*(b[4*c+3] - b[4*c+0]); + BP = Geom::Point(BP[X] + 0.0001,BP[Y] + 0.0001); + Geom::Point CP = b[4*c+3] + (1./3)*(b[4*c+0] - b[4*c+3]); + CP = Geom::Point(CP[X] + 0.0001,CP[Y] + 0.0001); + pc->green_curve->curveto(BP,CP,b[4*c+3]); + }else{ + pc->green_curve->curveto(b[4*c+1], b[4*c+2], b[4*c+3]); + } + //BSpline + } + + 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::Curve const * last_seg = pc->green_curve->last_segment(); + g_assert( last_seg ); // Relevance: validity of (*last_seg) + pc->p[0] = last_seg->finalPoint(); + pc->npoints = 1; + Geom::Curve *last_seg_reverse = last_seg->reverse(); + Geom::Point const req_vec( -last_seg_reverse->unitTangentAt(0) ); + delete last_seg_reverse; + 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(PencilTool *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(); + + if ( pc->sketch_n > 0 ) { + double t =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::Curve const * last_seg = pc->green_curve->last_segment(); + g_assert( last_seg ); // Relevance: validity of (*last_seg) + pc->p[0] = last_seg->finalPoint(); + pc->npoints = 1; + Geom::Curve *last_seg_reverse = last_seg->reverse(); + Geom::Point const req_vec( -last_seg_reverse->unitTangentAt(0) ); + delete last_seg_reverse; + 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 +fit_and_split(PencilTool *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]); + //BSpline + using Geom::X; + using Geom::Y; + //Si el modo es BSpline modificamos para que el trazado cree los nodos adhoc + Inkscape::Preferences *prefs = Inkscape::Preferences::get(); + guint mode = prefs->getInt("/tools/freehand/pencil/freehand-mode", 0); + if(mode == 2){ + Geom::Point B = b[0] + (1./3)*(b[3] - b[0]); + B = Geom::Point(B[X] + 0.0001,B[Y] + 0.0001); + Geom::Point C = b[3] + (1./3)*(b[0] - b[3]); + C = Geom::Point(C[X] + 0.0001,C[Y] + 0.0001); + pc->red_curve->curveto(B,C,b[3]); + }else{ + pc->red_curve->curveto(b[1], b[2], b[3]); + } + //BSpline End + 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::Curve const * last_seg = pc->red_curve->last_segment(); + g_assert( last_seg ); // Relevance: validity of (*last_seg) + pc->p[0] = last_seg->finalPoint(); + pc->npoints = 1; + Geom::Curve *last_seg_reverse = last_seg->reverse(); + Geom::Point const req_vec( -last_seg_reverse->unitTangentAt(0) ); + delete last_seg_reverse; + 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:fileencoding=utf-8:textwidth=99 : |