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| -rw-r--r-- | src/ui/tools/calligraphic-tool.cpp | 1192 |
1 files changed, 1192 insertions, 0 deletions
diff --git a/src/ui/tools/calligraphic-tool.cpp b/src/ui/tools/calligraphic-tool.cpp new file mode 100644 index 0000000..aced95d --- /dev/null +++ b/src/ui/tools/calligraphic-tool.cpp @@ -0,0 +1,1192 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Handwriting-like drawing mode + * + * Authors: + * Mitsuru Oka <oka326@parkcity.ne.jp> + * Lauris Kaplinski <lauris@kaplinski.com> + * bulia byak <buliabyak@users.sf.net> + * MenTaLguY <mental@rydia.net> + * Abhishek Sharma + * Jon A. Cruz <jon@joncruz.org> + * + * The original dynadraw code: + * Paul Haeberli <paul@sgi.com> + * + * Copyright (C) 1998 The Free Software Foundation + * Copyright (C) 1999-2005 authors + * Copyright (C) 2001-2002 Ximian, Inc. + * Copyright (C) 2005-2007 bulia byak + * Copyright (C) 2006 MenTaLguY + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#define noDYNA_DRAW_VERBOSE + +#include "ui/tools/calligraphic-tool.h" + +#include <cstring> +#include <numeric> +#include <string> + +#include <gdk/gdkkeysyms.h> +#include <glibmm/i18n.h> +#include <gtk/gtk.h> + +#include <2geom/bezier-utils.h> +#include <2geom/circle.h> +#include <2geom/pathvector.h> + +#include "context-fns.h" +#include "desktop-events.h" +#include "desktop-style.h" +#include "desktop.h" +#include "document-undo.h" +#include "document.h" +#include "inkscape.h" +#include "message-context.h" +#include "selection.h" + +#include "display/control/canvas-item-bpath.h" +#include "display/control/canvas-item-drawing.h" // ctx +#include "display/curve.h" +#include "display/drawing.h" + +#include "include/macros.h" + +#include "livarot/Path.h" +#include "livarot/Shape.h" + +#include "object/sp-shape.h" +#include "object/sp-text.h" + +#include "path/path-util.h" + +#include "svg/svg.h" + +#include "ui/icon-names.h" +#include "ui/tools/freehand-base.h" + +#include "util/units.h" + +using Inkscape::DocumentUndo; +using Inkscape::Util::Quantity; +using Inkscape::Util::Unit; +using Inkscape::Util::unit_table; + +#define DDC_RED_RGBA 0xff0000ff + +#define TOLERANCE_CALLIGRAPHIC 0.1 + +#define DYNA_EPSILON 0.5e-6 +#define DYNA_EPSILON_START 0.5e-2 +#define DYNA_VEL_START 1e-5 + +#define DYNA_MIN_WIDTH 1.0e-6 + +namespace Inkscape { +namespace UI { +namespace Tools { + +CalligraphicTool::CalligraphicTool(SPDesktop *desktop) + : DynamicBase(desktop, "/tools/calligraphic", "calligraphy.svg") + , keep_selected(true) + , hatch_spacing(0) + , hatch_spacing_step(0) + , hatch_item(nullptr) + , hatch_livarot_path(nullptr) + , hatch_last_nearest(Geom::Point(0, 0)) + , hatch_last_pointer(Geom::Point(0, 0)) + , hatch_escaped(false) + , just_started_drawing(false) + , trace_bg(false) +{ + this->vel_thin = 0.1; + this->flatness = -0.9; + this->cap_rounding = 0.0; + this->abs_width = false; + + this->accumulated.reset(new SPCurve()); + this->currentcurve.reset(new SPCurve()); + + this->cal1.reset(new SPCurve()); + this->cal2.reset(new SPCurve()); + + currentshape = new Inkscape::CanvasItemBpath(desktop->getCanvasSketch()); + currentshape->set_stroke(0x0); + currentshape->set_fill(DDC_RED_RGBA, SP_WIND_RULE_EVENODD); + + /* fixme: Cannot we cascade it to root more clearly? */ + currentshape->connect_event(sigc::bind(sigc::ptr_fun(sp_desktop_root_handler), desktop)); + + hatch_area = new Inkscape::CanvasItemBpath(desktop->getCanvasControls()); + hatch_area->set_fill(0x0, SP_WIND_RULE_EVENODD); + hatch_area->set_stroke(0x0000007f); + hatch_area->set_pickable(false); + hatch_area->hide(); + + sp_event_context_read(this, "mass"); + sp_event_context_read(this, "wiggle"); + sp_event_context_read(this, "angle"); + sp_event_context_read(this, "width"); + sp_event_context_read(this, "thinning"); + sp_event_context_read(this, "tremor"); + sp_event_context_read(this, "flatness"); + sp_event_context_read(this, "tracebackground"); + sp_event_context_read(this, "usepressure"); + sp_event_context_read(this, "usetilt"); + sp_event_context_read(this, "abs_width"); + sp_event_context_read(this, "keep_selected"); + sp_event_context_read(this, "cap_rounding"); + + this->is_drawing = false; + + Inkscape::Preferences *prefs = Inkscape::Preferences::get(); + if (prefs->getBool("/tools/calligraphic/selcue")) { + this->enableSelectionCue(); + } +} + +CalligraphicTool::~CalligraphicTool() +{ + if (hatch_area) { + delete hatch_area; + hatch_area = nullptr; + } + if (currentshape) { + delete currentshape; + currentshape = nullptr; + } +} + +void CalligraphicTool::set(const Inkscape::Preferences::Entry& val) { + Glib::ustring path = val.getEntryName(); + + if (path == "tracebackground") { + this->trace_bg = val.getBool(); + } else if (path == "keep_selected") { + this->keep_selected = val.getBool(); + } else { + //pass on up to parent class to handle common attributes. + DynamicBase::set(val); + } + + //g_print("DDC: %g %g %g %g\n", ddc->mass, ddc->drag, ddc->angle, ddc->width); +} + +static double +flerp(double f0, double f1, double p) +{ + return f0 + ( f1 - f0 ) * p; +} + +void CalligraphicTool::reset(Geom::Point p) { + this->last = this->cur = this->getNormalizedPoint(p); + + this->vel = Geom::Point(0,0); + this->vel_max = 0; + this->acc = Geom::Point(0,0); + this->ang = Geom::Point(0,0); + this->del = Geom::Point(0,0); +} + +void CalligraphicTool::extinput(GdkEvent *event) { + if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &this->pressure)) { + this->pressure = CLAMP (this->pressure, DDC_MIN_PRESSURE, DDC_MAX_PRESSURE); + } else { + this->pressure = DDC_DEFAULT_PRESSURE; + } + + if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &this->xtilt)) { + this->xtilt = CLAMP (this->xtilt, DDC_MIN_TILT, DDC_MAX_TILT); + } else { + this->xtilt = DDC_DEFAULT_TILT; + } + + if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &this->ytilt)) { + this->ytilt = CLAMP (this->ytilt, DDC_MIN_TILT, DDC_MAX_TILT); + } else { + this->ytilt = DDC_DEFAULT_TILT; + } +} + + +bool CalligraphicTool::apply(Geom::Point p) { + Geom::Point n = this->getNormalizedPoint(p); + + /* Calculate mass and drag */ + double const mass = flerp(1.0, 160.0, this->mass); + double const drag = flerp(0.0, 0.5, this->drag * this->drag); + + /* Calculate force and acceleration */ + Geom::Point force = n - this->cur; + + // If force is below the absolute threshold DYNA_EPSILON, + // or we haven't yet reached DYNA_VEL_START (i.e. at the beginning of stroke) + // _and_ the force is below the (higher) DYNA_EPSILON_START threshold, + // discard this move. + // This prevents flips, blobs, and jerks caused by microscopic tremor of the tablet pen, + // especially bothersome at the start of the stroke where we don't yet have the inertia to + // smooth them out. + if ( Geom::L2(force) < DYNA_EPSILON || (this->vel_max < DYNA_VEL_START && Geom::L2(force) < DYNA_EPSILON_START)) { + return FALSE; + } + + this->acc = force / mass; + + /* Calculate new velocity */ + this->vel += this->acc; + + if (Geom::L2(this->vel) > this->vel_max) + this->vel_max = Geom::L2(this->vel); + + /* Calculate angle of drawing tool */ + + double a1; + if (this->usetilt) { + // 1a. calculate nib angle from input device tilt: + if (this->xtilt == 0 && this->ytilt == 0) { + // to be sure that atan2 in the computation below + // would not crash or return NaN. + a1 = 0; + } else { + Geom::Point dir(-this->xtilt, this->ytilt); + a1 = atan2(dir); + } + } + else { + // 1b. fixed dc->angle (absolutely flat nib): + a1 = ( this->angle / 180.0 ) * M_PI; + } + a1 *= -_desktop->yaxisdir(); + if (this->flatness < 0.0) { + // flips direction. Useful when this->usetilt + // allows simulating both pen and calligraphic brush + a1 *= -1; + } + a1 = fmod(a1, M_PI); + if (a1 > 0.5*M_PI) { + a1 -= M_PI; + } else if (a1 <= -0.5*M_PI) { + a1 += M_PI; + } + + // 2. perpendicular to dc->vel (absolutely non-flat nib): + gdouble const mag_vel = Geom::L2(this->vel); + if ( mag_vel < DYNA_EPSILON ) { + return FALSE; + } + Geom::Point ang2 = Geom::rot90(this->vel) / mag_vel; + + // 3. Average them using flatness parameter: + // calculate angles + double a2 = atan2(ang2); + // flip a2 to force it to be in the same half-circle as a1 + bool flipped = false; + if (fabs (a2-a1) > 0.5*M_PI) { + a2 += M_PI; + flipped = true; + } + // normalize a2 + if (a2 > M_PI) + a2 -= 2*M_PI; + if (a2 < -M_PI) + a2 += 2*M_PI; + // find the flatness-weighted bisector angle, unflip if a2 was flipped + // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this? + double new_ang = a1 + (1 - fabs(this->flatness)) * (a2 - a1) - (flipped? M_PI : 0); + + // Try to detect a sudden flip when the new angle differs too much from the previous for the + // current velocity; in that case discard this move + double angle_delta = Geom::L2(Geom::Point (cos (new_ang), sin (new_ang)) - this->ang); + if ( angle_delta / Geom::L2(this->vel) > 4000 ) { + return FALSE; + } + + // convert to point + this->ang = Geom::Point (cos (new_ang), sin (new_ang)); + +// g_print ("force %g acc %g vel_max %g vel %g a1 %g a2 %g new_ang %g\n", Geom::L2(force), Geom::L2(dc->acc), dc->vel_max, Geom::L2(dc->vel), a1, a2, new_ang); + + /* Apply drag */ + this->vel *= 1.0 - drag; + + /* Update position */ + this->last = this->cur; + this->cur += this->vel; + + return TRUE; +} + +void CalligraphicTool::brush() { + g_assert( this->npoints >= 0 && this->npoints < SAMPLING_SIZE ); + + // How much velocity thins strokestyle + double vel_thin = flerp (0, 160, this->vel_thin); + + // Influence of pressure on thickness + double pressure_thick = (this->usepressure ? this->pressure : 1.0); + + // get the real brush point, not the same as pointer (affected by hatch tracking and/or mass + // drag) + Geom::Point brush = getViewPoint(this->cur); + Geom::Point brush_w = _desktop->d2w(brush); + + double trace_thick = 1; + if (this->trace_bg) { + // Trace background, use single pixel under brush. + Geom::IntRect area = Geom::IntRect::from_xywh(brush_w.floor(), Geom::IntPoint(1, 1)); + + Inkscape::CanvasItemDrawing *canvas_item_drawing = _desktop->getCanvasDrawing(); + Inkscape::Drawing *drawing = canvas_item_drawing->get_drawing(); + + // Ensure drawing up-to-date. (Is this really necessary?) + drawing->update(); + + // Get average color. + double R, G, B, A; + drawing->average_color(area, R, G, B, A); + + // Convert to thickness. + double max = MAX (MAX (R, G), B); + double min = MIN (MIN (R, G), B); + double L = A * (max + min)/2 + (1 - A); // blend with white bg + trace_thick = 1 - L; + //g_print ("L %g thick %g\n", L, trace_thick); + } + + double width = (pressure_thick * trace_thick - vel_thin * Geom::L2(this->vel)) * this->width; + + double tremble_left = 0, tremble_right = 0; + if (this->tremor > 0) { + // obtain two normally distributed random variables, using polar Box-Muller transform + double x1, x2, w, y1, y2; + do { + x1 = 2.0 * g_random_double_range(0,1) - 1.0; + x2 = 2.0 * g_random_double_range(0,1) - 1.0; + w = x1 * x1 + x2 * x2; + } while ( w >= 1.0 ); + w = sqrt( (-2.0 * log( w ) ) / w ); + y1 = x1 * w; + y2 = x2 * w; + + // deflect both left and right edges randomly and independently, so that: + // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve; + // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths; + // (3) deflection somewhat depends on speed, to prevent fast strokes looking + // comparatively smooth and slow ones excessively jittery + tremble_left = (y1)*this->tremor * (0.15 + 0.8*width) * (0.35 + 14*Geom::L2(this->vel)); + tremble_right = (y2)*this->tremor * (0.15 + 0.8*width) * (0.35 + 14*Geom::L2(this->vel)); + } + + if ( width < 0.02 * this->width ) { + width = 0.02 * this->width; + } + + double dezoomify_factor = 0.05 * 1000; + if (!this->abs_width) { + dezoomify_factor /= _desktop->current_zoom(); + } + + Geom::Point del_left = dezoomify_factor * (width + tremble_left) * this->ang; + Geom::Point del_right = dezoomify_factor * (width + tremble_right) * this->ang; + + this->point1[this->npoints] = brush + del_left; + this->point2[this->npoints] = brush - del_right; + + this->del = 0.5*(del_left + del_right); + + this->npoints++; +} + +static void +sp_ddc_update_toolbox (SPDesktop *desktop, const gchar *id, double value) +{ + desktop->setToolboxAdjustmentValue (id, value); +} + +void CalligraphicTool::cancel() { + this->dragging = false; + this->is_drawing = false; + + ungrabCanvasEvents(); + + /* Remove all temporary line segments */ + for (auto segment :this->segments) { + delete segment; + } + this->segments.clear(); + + /* reset accumulated curve */ + this->accumulated->reset(); + this->clear_current(); + + if (this->repr) { + this->repr = nullptr; + } +} + +bool CalligraphicTool::root_handler(GdkEvent* event) { + gint ret = FALSE; + Inkscape::Preferences *prefs = Inkscape::Preferences::get(); + Unit const *unit = unit_table.getUnit(prefs->getString("/tools/calligraphic/unit")); + + switch (event->type) { + case GDK_BUTTON_PRESS: + if (event->button.button == 1) { + if (Inkscape::have_viable_layer(_desktop, defaultMessageContext()) == false) { + return TRUE; + } + + this->accumulated->reset(); + + if (this->repr) { + this->repr = nullptr; + } + + /* initialize first point */ + this->npoints = 0; + + grabCanvasEvents(); + + ret = TRUE; + + set_high_motion_precision(); + this->is_drawing = true; + this->just_started_drawing = true; + } + break; + case GDK_MOTION_NOTIFY: + { + Geom::Point const motion_w(event->motion.x, + event->motion.y); + Geom::Point motion_dt(_desktop->w2d(motion_w)); + this->extinput(event); + + this->message_context->clear(); + + // for hatching: + double hatch_dist = 0; + Geom::Point hatch_unit_vector(0,0); + Geom::Point nearest(0,0); + Geom::Point pointer(0,0); + Geom::Affine motion_to_curve(Geom::identity()); + + if (event->motion.state & GDK_CONTROL_MASK) { // hatching - sense the item + + SPItem *selected = _desktop->getSelection()->singleItem(); + if (selected && (SP_IS_SHAPE(selected) || SP_IS_TEXT(selected))) { + // One item selected, and it's a path; + // let's try to track it as a guide + + if (selected != this->hatch_item) { + this->hatch_item = selected; + if (this->hatch_livarot_path) + delete this->hatch_livarot_path; + this->hatch_livarot_path = Path_for_item (this->hatch_item, true, true); + if (hatch_livarot_path) { + hatch_livarot_path->ConvertWithBackData(0.01); + } + } + + // calculate pointer point in the guide item's coords + motion_to_curve = selected->dt2i_affine() * selected->i2doc_affine(); + pointer = motion_dt * motion_to_curve; + + // calculate the nearest point on the guide path + std::optional<Path::cut_position> position = get_nearest_position_on_Path(this->hatch_livarot_path, pointer); + if (position) { + nearest = get_point_on_Path(hatch_livarot_path, position->piece, position->t); + + // distance from pointer to nearest + hatch_dist = Geom::L2(pointer - nearest); + // unit-length vector + hatch_unit_vector = (pointer - nearest) / hatch_dist; + + this->message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Guide path selected</b>; start drawing along the guide with <b>Ctrl</b>")); + } + } else { + this->message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Select a guide path</b> to track with <b>Ctrl</b>")); + } + } + + if ( this->is_drawing && (event->motion.state & GDK_BUTTON1_MASK)) { + this->dragging = TRUE; + + if (event->motion.state & GDK_CONTROL_MASK && this->hatch_item) { // hatching + +#define HATCH_VECTOR_ELEMENTS 12 +#define INERTIA_ELEMENTS 24 +#define SPEED_ELEMENTS 12 +#define SPEED_MIN 0.3 +#define SPEED_NORMAL 0.35 +#define INERTIA_FORCE 0.5 + + // speed is the movement of the nearest point along the guide path, divided by + // the movement of the pointer at the same period; it is averaged for the last + // SPEED_ELEMENTS motion events. Normally, as you track the guide path, speed + // is about 1, i.e. the nearest point on the path is moved by about the same + // distance as the pointer. If the speed starts to decrease, we are losing + // contact with the guide; if it drops below SPEED_MIN, we are on our own and + // not attracted to guide anymore. Most often this happens when you have + // tracked to the end of a guide calligraphic stroke and keep moving + // further. We try to handle this situation gracefully: not stick with the + // guide forever but let go of it smoothly and without sharp jerks (non-zero + // mass recommended; with zero mass, jerks are still quite noticeable). + + double speed = 1; + if (Geom::L2(this->hatch_last_nearest) != 0) { + // the distance nearest moved since the last motion event + double nearest_moved = Geom::L2(nearest - this->hatch_last_nearest); + // the distance pointer moved since the last motion event + double pointer_moved = Geom::L2(pointer - this->hatch_last_pointer); + // store them in stacks limited to SPEED_ELEMENTS + this->hatch_nearest_past.push_front(nearest_moved); + if (this->hatch_nearest_past.size() > SPEED_ELEMENTS) + this->hatch_nearest_past.pop_back(); + this->hatch_pointer_past.push_front(pointer_moved); + if (this->hatch_pointer_past.size() > SPEED_ELEMENTS) + this->hatch_pointer_past.pop_back(); + + // If the stacks are full, + if (this->hatch_nearest_past.size() == SPEED_ELEMENTS) { + // calculate the sums of all stored movements + double nearest_sum = std::accumulate (this->hatch_nearest_past.begin(), this->hatch_nearest_past.end(), 0.0); + double pointer_sum = std::accumulate (this->hatch_pointer_past.begin(), this->hatch_pointer_past.end(), 0.0); + // and divide to get the speed + speed = nearest_sum/pointer_sum; + //g_print ("nearest sum %g pointer_sum %g speed %g\n", nearest_sum, pointer_sum, speed); + } + } + + if ( this->hatch_escaped // already escaped, do not reattach + || (speed < SPEED_MIN) // stuck; most likely reached end of traced stroke + || (this->hatch_spacing > 0 && hatch_dist > 50 * this->hatch_spacing) // went too far from the guide + ) { + // We are NOT attracted to the guide! + + //g_print ("\nlast_nearest %g %g nearest %g %g pointer %g %g pos %d %g\n", dc->last_nearest[Geom::X], dc->last_nearest[Geom::Y], nearest[Geom::X], nearest[Geom::Y], pointer[Geom::X], pointer[Geom::Y], position->piece, position->t); + + // Remember hatch_escaped so we don't get + // attracted again until the end of this stroke + this->hatch_escaped = true; + + if (this->inertia_vectors.size() >= INERTIA_ELEMENTS/2) { // move by inertia + Geom::Point moved_past_escape = motion_dt - this->inertia_vectors.front(); + Geom::Point inertia = + this->inertia_vectors.front() - this->inertia_vectors.back(); + + double dot = Geom::dot (moved_past_escape, inertia); + dot /= Geom::L2(moved_past_escape) * Geom::L2(inertia); + + if (dot > 0) { // mouse is still moving in approx the same direction + Geom::Point should_have_moved = + (inertia) * (1/Geom::L2(inertia)) * Geom::L2(moved_past_escape); + motion_dt = this->inertia_vectors.front() + + (INERTIA_FORCE * should_have_moved + (1 - INERTIA_FORCE) * moved_past_escape); + } + } + + } else { + + // Calculate angle cosine of this vector-to-guide and all past vectors + // summed, to detect if we accidentally flipped to the other side of the + // guide + Geom::Point hatch_vector_accumulated = std::accumulate + (this->hatch_vectors.begin(), this->hatch_vectors.end(), Geom::Point(0,0)); + double dot = Geom::dot (pointer - nearest, hatch_vector_accumulated); + dot /= Geom::L2(pointer - nearest) * Geom::L2(hatch_vector_accumulated); + + if (this->hatch_spacing != 0) { // spacing was already set + double target; + if (speed > SPEED_NORMAL) { + // all ok, strictly obey the spacing + target = this->hatch_spacing; + } else { + // looks like we're starting to lose speed, + // so _gradually_ let go attraction to prevent jerks + target = (this->hatch_spacing * speed + hatch_dist * (SPEED_NORMAL - speed))/SPEED_NORMAL; + } + if (!std::isnan(dot) && dot < -0.5) {// flip + target = -target; + } + + // This is the track pointer that we will use instead of the real one + Geom::Point new_pointer = nearest + target * hatch_unit_vector; + + // some limited feedback: allow persistent pulling to slightly change + // the spacing + this->hatch_spacing += (hatch_dist - this->hatch_spacing)/3500; + + // return it to the desktop coords + motion_dt = new_pointer * motion_to_curve.inverse(); + + if (speed >= SPEED_NORMAL) { + this->inertia_vectors.push_front(motion_dt); + if (this->inertia_vectors.size() > INERTIA_ELEMENTS) + this->inertia_vectors.pop_back(); + } + + } else { + // this is the first motion event, set the dist + this->hatch_spacing = hatch_dist; + } + + // remember last points + this->hatch_last_pointer = pointer; + this->hatch_last_nearest = nearest; + + this->hatch_vectors.push_front(pointer - nearest); + if (this->hatch_vectors.size() > HATCH_VECTOR_ELEMENTS) + this->hatch_vectors.pop_back(); + } + + this->message_context->set(Inkscape::NORMAL_MESSAGE, this->hatch_escaped? _("Tracking: <b>connection to guide path lost!</b>") : _("<b>Tracking</b> a guide path")); + + } else { + this->message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Drawing</b> a calligraphic stroke")); + } + + if (this->just_started_drawing) { + this->just_started_drawing = false; + this->reset(motion_dt); + } + + if (!this->apply(motion_dt)) { + ret = TRUE; + break; + } + + if ( this->cur != this->last ) { + this->brush(); + g_assert( this->npoints > 0 ); + this->fit_and_split(false); + } + ret = TRUE; + } + + Geom::PathVector path = Geom::Path(Geom::Circle(0,0,1)); // Unit circle centered at origin. + + // Draw the hatching circle if necessary + if (event->motion.state & GDK_CONTROL_MASK) { + if (this->hatch_spacing == 0 && hatch_dist != 0) { + // Haven't set spacing yet: gray, center free, update radius live + + Geom::Point c = _desktop->w2d(motion_w); + Geom::Affine const sm (Geom::Scale(hatch_dist, hatch_dist) * Geom::Translate(c)); + path *= sm; + + hatch_area->set_bpath(path, true); + hatch_area->set_stroke(0x7f7f7fff); + hatch_area->show(); + + } else if (this->dragging && !this->hatch_escaped && hatch_dist != 0) { + // Tracking: green, center snapped, fixed radius + + Geom::Point c = motion_dt; + Geom::Affine const sm (Geom::Scale(this->hatch_spacing, this->hatch_spacing) * Geom::Translate(c)); + path *= sm; + + hatch_area->set_bpath(path, true); + hatch_area->set_stroke(0x00FF00ff); + hatch_area->show(); + + } else if (this->dragging && this->hatch_escaped && hatch_dist != 0) { + // Tracking escaped: red, center free, fixed radius + + Geom::Point c = motion_dt; + Geom::Affine const sm (Geom::Scale(this->hatch_spacing, this->hatch_spacing) * Geom::Translate(c)); + path *= sm; + + hatch_area->set_bpath(path, true); + hatch_area->set_stroke(0xff0000ff); + hatch_area->show(); + + } else { + // Not drawing but spacing set: gray, center snapped, fixed radius + + Geom::Point c = (nearest + this->hatch_spacing * hatch_unit_vector) * motion_to_curve.inverse(); + if (!std::isnan(c[Geom::X]) && !std::isnan(c[Geom::Y]) && this->hatch_spacing!=0) { + Geom::Affine const sm (Geom::Scale(this->hatch_spacing, this->hatch_spacing) * Geom::Translate(c)); + path *= sm; + + hatch_area->set_bpath(path, true); + hatch_area->set_stroke(0x7f7f7fff); + hatch_area->show(); + } + } + } else { + hatch_area->hide(); + } + } + break; + + + case GDK_BUTTON_RELEASE: + { + Geom::Point const motion_w(event->button.x, event->button.y); + Geom::Point const motion_dt(_desktop->w2d(motion_w)); + + ungrabCanvasEvents(); + + set_high_motion_precision(false); + this->is_drawing = false; + + if (this->dragging && event->button.button == 1) { + this->dragging = FALSE; + + this->apply(motion_dt); + + /* Remove all temporary line segments */ + for (auto segment : this->segments) { + delete segment; + } + this->segments.clear(); + + /* Create object */ + this->fit_and_split(true); + if (this->accumulate()) + this->set_to_accumulated(event->button.state & GDK_SHIFT_MASK, event->button.state & GDK_MOD1_MASK); // performs document_done + else + g_warning ("Failed to create path: invalid data in dc->cal1 or dc->cal2"); + + /* reset accumulated curve */ + this->accumulated->reset(); + + this->clear_current(); + if (this->repr) { + this->repr = nullptr; + } + + if (!this->hatch_pointer_past.empty()) this->hatch_pointer_past.clear(); + if (!this->hatch_nearest_past.empty()) this->hatch_nearest_past.clear(); + if (!this->inertia_vectors.empty()) this->inertia_vectors.clear(); + if (!this->hatch_vectors.empty()) this->hatch_vectors.clear(); + this->hatch_last_nearest = Geom::Point(0,0); + this->hatch_last_pointer = Geom::Point(0,0); + this->hatch_escaped = false; + this->hatch_item = nullptr; + this->hatch_livarot_path = nullptr; + this->just_started_drawing = false; + + if (this->hatch_spacing != 0 && !this->keep_selected) { + // we do not select the newly drawn path, so increase spacing by step + if (this->hatch_spacing_step == 0) { + this->hatch_spacing_step = this->hatch_spacing; + } + this->hatch_spacing += this->hatch_spacing_step; + } + + this->message_context->clear(); + ret = TRUE; + } else if (!this->dragging + && event->button.button == 1 + && Inkscape::have_viable_layer(_desktop, defaultMessageContext())) + { + spdc_create_single_dot(this, _desktop->w2d(motion_w), "/tools/calligraphic", event->button.state); + ret = TRUE; + } + break; + } + + case GDK_KEY_PRESS: + switch (get_latin_keyval (&event->key)) { + case GDK_KEY_Up: + case GDK_KEY_KP_Up: + if (!MOD__CTRL_ONLY(event)) { + this->angle += 5.0; + if (this->angle > 90.0) + this->angle = 90.0; + sp_ddc_update_toolbox(_desktop, "calligraphy-angle", this->angle); + ret = TRUE; + } + break; + case GDK_KEY_Down: + case GDK_KEY_KP_Down: + if (!MOD__CTRL_ONLY(event)) { + this->angle -= 5.0; + if (this->angle < -90.0) + this->angle = -90.0; + sp_ddc_update_toolbox(_desktop, "calligraphy-angle", this->angle); + ret = TRUE; + } + break; + case GDK_KEY_Right: + case GDK_KEY_KP_Right: + if (!MOD__CTRL_ONLY(event)) { + this->width = Quantity::convert(this->width, "px", unit) + 0.01; + if (this->width > 1.0) + this->width = 1.0; + sp_ddc_update_toolbox (_desktop, "calligraphy-width", this->width * 100); // the same spinbutton is for alt+x + ret = TRUE; + } + break; + case GDK_KEY_Left: + case GDK_KEY_KP_Left: + if (!MOD__CTRL_ONLY(event)) { + this->width = Quantity::convert(this->width, "px", unit) - 0.01; + if (this->width < 0.00001) + this->width = 0.00001; + sp_ddc_update_toolbox(_desktop, "calligraphy-width", this->width * 100); + ret = TRUE; + } + break; + case GDK_KEY_Home: + case GDK_KEY_KP_Home: + this->width = 0.00001; + sp_ddc_update_toolbox(_desktop, "calligraphy-width", this->width * 100); + ret = TRUE; + break; + case GDK_KEY_End: + case GDK_KEY_KP_End: + this->width = 1.0; + sp_ddc_update_toolbox(_desktop, "calligraphy-width", this->width * 100); + ret = TRUE; + break; + case GDK_KEY_x: + case GDK_KEY_X: + if (MOD__ALT_ONLY(event)) { + _desktop->setToolboxFocusTo("calligraphy-width"); + ret = TRUE; + } + break; + case GDK_KEY_Escape: + if (this->is_drawing) { + // if drawing, cancel, otherwise pass it up for deselecting + this->cancel(); + ret = TRUE; + } + break; + case GDK_KEY_z: + case GDK_KEY_Z: + if (MOD__CTRL_ONLY(event) && this->is_drawing) { + // if drawing, cancel, otherwise pass it up for undo + this->cancel(); + ret = TRUE; + } + break; + default: + break; + } + break; + + case GDK_KEY_RELEASE: + switch (get_latin_keyval(&event->key)) { + case GDK_KEY_Control_L: + case GDK_KEY_Control_R: + this->message_context->clear(); + this->hatch_spacing = 0; + this->hatch_spacing_step = 0; + break; + default: + break; + } + break; + + default: + break; + } + + if (!ret) { +// if ((SP_EVENT_CONTEXT_CLASS(sp_dyna_draw_context_parent_class))->root_handler) { +// ret = (SP_EVENT_CONTEXT_CLASS(sp_dyna_draw_context_parent_class))->root_handler(event_context, event); +// } + ret = DynamicBase::root_handler(event); + } + + return ret; +} + + +void CalligraphicTool::clear_current() { + /* reset bpath */ + this->currentshape->set_bpath(nullptr); + + /* reset curve */ + this->currentcurve->reset(); + this->cal1->reset(); + this->cal2->reset(); + + /* reset points */ + this->npoints = 0; +} + +void CalligraphicTool::set_to_accumulated(bool unionize, bool subtract) { + if (!this->accumulated->is_empty()) { + if (!this->repr) { + /* Create object */ + Inkscape::XML::Document *xml_doc = _desktop->doc()->getReprDoc(); + Inkscape::XML::Node *repr = xml_doc->createElement("svg:path"); + + /* Set style */ + sp_desktop_apply_style_tool(_desktop, repr, "/tools/calligraphic", false); + + this->repr = repr; + + auto layer = currentLayer(); + SPItem *item=SP_ITEM(layer->appendChildRepr(this->repr)); + Inkscape::GC::release(this->repr); + item->transform = layer->i2doc_affine().inverse(); + item->updateRepr(); + } + + Geom::PathVector pathv = this->accumulated->get_pathvector() * _desktop->dt2doc(); + this->repr->setAttribute("d", sp_svg_write_path(pathv)); + + if (unionize) { + _desktop->getSelection()->add(this->repr); + _desktop->getSelection()->pathUnion(true); + } else if (subtract) { + _desktop->getSelection()->add(this->repr); + _desktop->getSelection()->pathDiff(true); + } else { + if (this->keep_selected) { + _desktop->getSelection()->set(this->repr); + } + } + + // Now we need to write the transform information. + // First, find out whether our repr is still linked to a valid object. In this case, + // we need to write the transform data only for this element. + // Either there was no boolean op or it failed. + SPItem *result = SP_ITEM(_desktop->doc()->getObjectByRepr(this->repr)); + + if (result == nullptr) { + // The boolean operation succeeded. + // Now we fetch the single item, that has been set as selected by the boolean op. + // This is its result. + result = _desktop->getSelection()->singleItem(); + } + result->doWriteTransform(result->transform, nullptr, true); + } else { + if (this->repr) { + sp_repr_unparent(this->repr); + } + + this->repr = nullptr; + } + + DocumentUndo::done(_desktop->getDocument(), _("Draw calligraphic stroke"), INKSCAPE_ICON("draw-calligraphic")); +} + +static void +add_cap(SPCurve &curve, + Geom::Point const &from, + Geom::Point const &to, + double rounding) +{ + if (Geom::L2( to - from ) > DYNA_EPSILON) { + Geom::Point vel = rounding * Geom::rot90( to - from ) / sqrt(2.0); + double mag = Geom::L2(vel); + + Geom::Point v = mag * Geom::rot90( to - from ) / Geom::L2( to - from ); + curve.curveto(from + v, to + v, to); + } +} + +bool CalligraphicTool::accumulate() { + if ( + this->cal1->is_empty() || + this->cal2->is_empty() || + (this->cal1->get_segment_count() <= 0) || + this->cal1->first_path()->closed() + ) { + + this->cal1->reset(); + this->cal2->reset(); + + return false; // failure + } + + auto rev_cal2 = this->cal2->create_reverse(); + + if ((rev_cal2->get_segment_count() <= 0) || rev_cal2->first_path()->closed()) { + this->cal1->reset(); + this->cal2->reset(); + + return false; // failure + } + + Geom::Curve const * dc_cal1_firstseg = this->cal1->first_segment(); + Geom::Curve const * rev_cal2_firstseg = rev_cal2->first_segment(); + Geom::Curve const * dc_cal1_lastseg = this->cal1->last_segment(); + Geom::Curve const * rev_cal2_lastseg = rev_cal2->last_segment(); + + this->accumulated->reset(); /* Is this required ?? */ + + this->accumulated->append(*cal1); + + add_cap(*accumulated, dc_cal1_lastseg->finalPoint(), rev_cal2_firstseg->initialPoint(), cap_rounding); + + this->accumulated->append(*rev_cal2, true); + + add_cap(*accumulated, rev_cal2_lastseg->finalPoint(), dc_cal1_firstseg->initialPoint(), cap_rounding); + + this->accumulated->closepath(); + + this->cal1->reset(); + this->cal2->reset(); + + return true; // success +} + +static double square(double const x) +{ + return x * x; +} + +void CalligraphicTool::fit_and_split(bool release) { + double const tolerance_sq = square(_desktop->w2d().descrim() * TOLERANCE_CALLIGRAPHIC); + +#ifdef DYNA_DRAW_VERBOSE + g_print("[F&S:R=%c]", release?'T':'F'); +#endif + + if (!( this->npoints > 0 && this->npoints < SAMPLING_SIZE )) { + return; // just clicked + } + + if ( this->npoints == SAMPLING_SIZE - 1 || release ) { +#define BEZIER_SIZE 4 +#define BEZIER_MAX_BEZIERS 8 +#define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS ) + +#ifdef DYNA_DRAW_VERBOSE + g_print("[F&S:#] dc->npoints:%d, release:%s\n", + this->npoints, release ? "TRUE" : "FALSE"); +#endif + + /* Current calligraphic */ + if ( this->cal1->is_empty() || this->cal2->is_empty() ) { + /* dc->npoints > 0 */ + /* g_print("calligraphics(1|2) reset\n"); */ + this->cal1->reset(); + this->cal2->reset(); + + this->cal1->moveto(this->point1[0]); + this->cal2->moveto(this->point2[0]); + } + + Geom::Point b1[BEZIER_MAX_LENGTH]; + gint const nb1 = Geom::bezier_fit_cubic_r(b1, this->point1, this->npoints, + tolerance_sq, BEZIER_MAX_BEZIERS); + g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) ); + + Geom::Point b2[BEZIER_MAX_LENGTH]; + gint const nb2 = Geom::bezier_fit_cubic_r(b2, this->point2, this->npoints, + tolerance_sq, BEZIER_MAX_BEZIERS); + g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) ); + + if ( nb1 != -1 && nb2 != -1 ) { + /* Fit and draw and reset state */ +#ifdef DYNA_DRAW_VERBOSE + g_print("nb1:%d nb2:%d\n", nb1, nb2); +#endif + /* CanvasShape */ + if (! release) { + this->currentcurve->reset(); + this->currentcurve->moveto(b1[0]); + for (Geom::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) { + this->currentcurve->curveto(bp1[1], bp1[2], bp1[3]); + } + this->currentcurve->lineto(b2[BEZIER_SIZE*(nb2-1) + 3]); + for (Geom::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) { + this->currentcurve->curveto(bp2[2], bp2[1], bp2[0]); + } + // FIXME: dc->segments is always NULL at this point?? + if (this->segments.empty()) { // first segment + add_cap(*currentcurve, b2[0], b1[0], cap_rounding); + } + this->currentcurve->closepath(); + currentshape->set_bpath(currentcurve.get(), true); + } + + /* Current calligraphic */ + for (Geom::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) { + this->cal1->curveto(bp1[1], bp1[2], bp1[3]); + } + for (Geom::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) { + this->cal2->curveto(bp2[1], bp2[2], bp2[3]); + } + } else { + /* fixme: ??? */ +#ifdef DYNA_DRAW_VERBOSE + g_print("[fit_and_split] failed to fit-cubic.\n"); +#endif + this->draw_temporary_box(); + + for (gint i = 1; i < this->npoints; i++) { + this->cal1->lineto(this->point1[i]); + } + for (gint i = 1; i < this->npoints; i++) { + this->cal2->lineto(this->point2[i]); + } + } + + /* Fit and draw and copy last point */ +#ifdef DYNA_DRAW_VERBOSE + g_print("[%d]Yup\n", this->npoints); +#endif + if (!release) { + g_assert(!this->currentcurve->is_empty()); + + guint32 fillColor = sp_desktop_get_color_tool(_desktop, "/tools/calligraphic", true); + double opacity = sp_desktop_get_master_opacity_tool(_desktop, "/tools/calligraphic"); + double fillOpacity = sp_desktop_get_opacity_tool(_desktop, "/tools/calligraphic", true); + guint fill = (fillColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*fillOpacity); + + auto cbp = new Inkscape::CanvasItemBpath(_desktop->getCanvasSketch(), currentcurve.get(), true); + cbp->set_fill(fill, SP_WIND_RULE_EVENODD); + cbp->set_stroke(0x0); + + /* fixme: Cannot we cascade it to root more clearly? */ + cbp->connect_event(sigc::bind(sigc::ptr_fun(sp_desktop_root_handler), _desktop)); + + this->segments.push_back(cbp); + } + + this->point1[0] = this->point1[this->npoints - 1]; + this->point2[0] = this->point2[this->npoints - 1]; + this->npoints = 1; + } else { + this->draw_temporary_box(); + } +} + +void CalligraphicTool::draw_temporary_box() { + this->currentcurve->reset(); + + this->currentcurve->moveto(this->point2[this->npoints-1]); + + for (gint i = this->npoints-2; i >= 0; i--) { + this->currentcurve->lineto(this->point2[i]); + } + + for (gint i = 0; i < this->npoints; i++) { + this->currentcurve->lineto(this->point1[i]); + } + + if (this->npoints >= 2) { + add_cap(*currentcurve, point1[npoints - 1], point2[npoints - 1], cap_rounding); + } + + this->currentcurve->closepath(); + currentshape->set_bpath(currentcurve.get(), true); +} + +} +} +} + + +/* + 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 : |