pencil-context.cpp revision 6ccdb18a54dcf42ccf8a0854542a6cfc973c9061
/** \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 "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 "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"
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 const &p, guint state);
static void fit_and_split(SPPencilContext *pc);
static void interpolate(SPPencilContext *pc);
static void sketch_interpolate(SPPencilContext *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; }
#include "sp-factory.h"
namespace {
SPEventContext* createPencilContext() {
return new SPPencilContext();
}
bool pencilContextRegistered = ToolFactory::instance().registerObject("/tools/freehand/pencil", createPencilContext);
}
const std::string& CPencilContext::getPrefsPath() {
return SPPencilContext::prefsPath;
}
const std::string SPPencilContext::prefsPath = "/tools/freehand/pencil";
G_DEFINE_TYPE(SPPencilContext, sp_pencil_context, SP_TYPE_DRAW_CONTEXT);
/**
* Initialize SPPencilContext vtable.
*/
static void
sp_pencil_context_class_init(SPPencilContextClass *klass)
{
GObjectClass *object_class;
SPEventContextClass *event_context_class;
object_class = (GObjectClass *) klass;
event_context_class = (SPEventContextClass *) 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;
}
CPencilContext::CPencilContext(SPPencilContext* pencilcontext) : CDrawContext(pencilcontext) {
this->sppencilcontext = pencilcontext;
}
SPPencilContext::SPPencilContext() : SPDrawContext() {
SPPencilContext* pc = this;
pc->cpencilcontext = new CPencilContext(pc);
delete pc->cdrawcontext;
pc->cdrawcontext = pc->cpencilcontext;
pc->ceventcontext = pc->cpencilcontext;
types.insert(typeid(SPPencilContext));
pc->is_drawing = false;
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 initialize SPPencilContext object.
*/
static void
sp_pencil_context_init(SPPencilContext *pc)
{
new (pc) SPPencilContext();
}
/**
* Callback to setup SPPencilContext object.
*/
static void
sp_pencil_context_setup(SPEventContext *ec)
{
ec->ceventcontext->setup();
}
void CPencilContext::setup() {
SPEventContext* ec = this->speventcontext;
Inkscape::Preferences *prefs = Inkscape::Preferences::get();
if (prefs->getBool("/tools/freehand/pencil/selcue")) {
ec->enableSelectionCue();
}
// if (((SPEventContextClass *) sp_pencil_context_parent_class)->setup) {
// ((SPEventContextClass *) sp_pencil_context_parent_class)->setup(ec);
// }
CDrawContext::setup();
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(sp_pencil_context_parent_class)->dispose(object);
}
/** Snaps new node relative to the previous node. */
static void
spdc_endpoint_snap(SPPencilContext 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.
*/
gint
sp_pencil_context_root_handler(SPEventContext *const ec, GdkEvent *event)
{
return ec->ceventcontext->root_handler(event);
}
gint CPencilContext::root_handler(GdkEvent* event) {
SPEventContext* ec = this->speventcontext;
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 *) sp_pencil_context_parent_class)->root_handler;
// if (parent_root_handler) {
// ret = parent_root_handler(ec, event);
// }
ret = CDrawContext::root_handler(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;
}
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(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]);
}
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(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 */
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 (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) {
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(SPPencilContext *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(SPPencilContext *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(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
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
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 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(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::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(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();
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(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::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 :