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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "live_effects/lpe-dashed-stroke.h"
#include "2geom/path.h"
#include "2geom/pathvector.h"
#include "helper/geom.h"
// TODO due to internal breakage in glibmm headers, this must be last:
#include <glibmm/i18n.h>
namespace Inkscape {
namespace LivePathEffect {
LPEDashedStroke::LPEDashedStroke(LivePathEffectObject *lpeobject)
: Effect(lpeobject)
, numberdashes(_("Number of dashes"), _("Number of dashes"), "numberdashes", &wr, this, 3)
, holefactor(_("Hole factor"), _("Hole factor"), "holefactor", &wr, this, 0.0)
, splitsegments(_("Use segments"), _("Use segments"), "splitsegments", &wr, this, true)
, halfextreme(_("Half start/end"), _("Start and end of each segment has half size"), "halfextreme", &wr, this, true)
, unifysegment(_("Equalize dashes"), _("Global dash length is approximately the length of the dashes in the shortest path segment"),
"unifysegment", &wr, this, true)
, message(_("Note"), _("Important messages"), "message", &wr, this,
_("Add <b>\"Fill Between Many LPE\"</b> to add fill."))
{
registerParameter(&numberdashes);
registerParameter(&holefactor);
registerParameter(&splitsegments);
registerParameter(&halfextreme);
registerParameter(&unifysegment);
registerParameter(&message);
numberdashes.param_set_range(2, 999999999);
numberdashes.param_set_increments(1, 1);
numberdashes.param_set_digits(0);
holefactor.param_set_range(-0.99999, 0.99999);
holefactor.param_set_increments(0.01, 0.01);
holefactor.param_set_digits(5);
message.param_set_min_height(30);
}
LPEDashedStroke::~LPEDashedStroke() = default;
void LPEDashedStroke::doBeforeEffect(SPLPEItem const *lpeitem) {}
///Calculate the time in curve_in with a real time of A
//TODO: find a better place to it
double LPEDashedStroke::timeAtLength(double const A, Geom::Path const &segment)
{
if ( A == 0 || segment[0].isDegenerate()) {
return 0;
}
double t = 1;
t = timeAtLength(A, segment.toPwSb());
return t;
}
///Calculate the time in curve_in with a real time of A
//TODO: find a better place to it
double LPEDashedStroke::timeAtLength(double const A, Geom::Piecewise<Geom::D2<Geom::SBasis>> pwd2)
{
if ( A == 0 || pwd2.size() == 0) {
return 0;
}
double t = pwd2.size();
std::vector<double> t_roots = roots(Geom::arcLengthSb(pwd2) - A);
if (!t_roots.empty()) {
t = t_roots[0];
}
return t;
}
Geom::PathVector LPEDashedStroke::doEffect_path(Geom::PathVector const &path_in)
{
Geom::PathVector const pv = pathv_to_linear_and_cubic_beziers(path_in);
Geom::PathVector result;
for (const auto & path_it : pv) {
if (path_it.empty()) {
continue;
}
Geom::Path::const_iterator curve_it1 = path_it.begin();
Geom::Path::const_iterator curve_it2 = ++(path_it.begin());
Geom::Path::const_iterator curve_endit = path_it.end_default();
if (path_it.closed()) {
const Geom::Curve &closingline = path_it.back_closed();
// the closing line segment is always of type
// Geom::LineSegment.
if (are_near(closingline.initialPoint(), closingline.finalPoint())) {
// closingline.isDegenerate() did not work, because it only checks for
// *exact* zero length, which goes wrong for relative coordinates and
// rounding errors...
// the closing line segment has zero-length. So stop before that one!
curve_endit = path_it.end_open();
}
}
size_t numberdashes_fixed = numberdashes;
if(!splitsegments) {
numberdashes_fixed++;
}
size_t numberholes = numberdashes_fixed - 1;
size_t ammount = numberdashes_fixed + numberholes;
if (halfextreme) {
ammount--;
}
double base = 1/(double)ammount;
double globaldash = base * numberdashes_fixed * (1 + holefactor);
if (halfextreme) {
globaldash = base * (numberdashes_fixed - 1) * (1 + holefactor);
}
double globalhole = 1-globaldash;
double dashpercent = globaldash/numberdashes_fixed;
if (halfextreme) {
dashpercent = globaldash/(numberdashes_fixed -1);
}
double holepercent = globalhole/numberholes;
double dashsize_fixed = 0;
double holesize_fixed = 0;
Geom::Piecewise<Geom::D2<Geom::SBasis> > pwd2 = path_it.toPwSb();
double length_pwd2 = length (pwd2);
double minlength = length_pwd2;
if(unifysegment) {
while (curve_it1 != curve_endit) {
double length_segment = (*curve_it1).length();
if (length_segment < minlength) {
minlength = length_segment;
dashsize_fixed = (*curve_it1).length() * dashpercent;
holesize_fixed = (*curve_it1).length() * holepercent;
}
++curve_it1;
++curve_it2;
}
curve_it1 = path_it.begin();
curve_it2 = ++(path_it.begin());
curve_endit = path_it.end_default();
}
size_t p_index = 0;
size_t start_index = result.size();
if(splitsegments) {
while (curve_it1 != curve_endit) {
Geom::Path segment = path_it.portion(p_index, p_index + 1);
if(unifysegment) {
double integral;
modf((*curve_it1).length()/(dashsize_fixed + holesize_fixed), &integral);
numberdashes_fixed = (size_t)integral + 1;
numberholes = numberdashes_fixed - 1;
ammount = numberdashes_fixed + numberholes;
if (halfextreme) {
ammount--;
}
base = 1/(double)ammount;
globaldash = base * numberdashes_fixed * (1 + holefactor);
if (halfextreme) {
globaldash = base * (numberdashes_fixed - 1) * (1 + holefactor);
}
globalhole = 1-globaldash;
dashpercent = globaldash/numberdashes_fixed;
if (halfextreme) {
dashpercent = globaldash/(numberdashes_fixed -1);
}
holepercent = globalhole/numberholes;
}
double dashsize = (*curve_it1).length() * dashpercent;
double holesize = (*curve_it1).length() * holepercent;
if ((*curve_it1).isLineSegment()) {
if (result.size() && Geom::are_near(segment.initialPoint(),result[result.size()-1].finalPoint())) {
result[result.size()-1].setFinal(segment.initialPoint());
if (halfextreme) {
result[result.size()-1].append(segment.portion(0.0, dashpercent/2.0));
} else {
result[result.size()-1].append(segment.portion(0.0, dashpercent));
}
} else {
if (halfextreme) {
result.push_back(segment.portion(0.0, dashpercent/2.0));
} else {
result.push_back(segment.portion(0.0, dashpercent));
}
}
double start = dashpercent + holepercent;
if (halfextreme) {
start = (dashpercent/2.0) + holepercent;
}
while (start < 1) {
if (start + dashpercent > 1) {
result.push_back(segment.portion(start, 1));
} else {
result.push_back(segment.portion(start, start + dashpercent));
}
start += dashpercent + holepercent;
}
} else if (!(*curve_it1).isLineSegment()) {
double start = 0.0;
double end = 0.0;
if (halfextreme) {
end = timeAtLength(dashsize/2.0,segment);
} else {
end = timeAtLength(dashsize,segment);
}
if (result.size() && Geom::are_near(segment.initialPoint(),result[result.size()-1].finalPoint())) {
result[result.size()-1].setFinal(segment.initialPoint());
result[result.size()-1].append(segment.portion(start, end));
} else {
result.push_back(segment.portion(start, end));
}
double startsize = dashsize + holesize;
if (halfextreme) {
startsize = (dashsize/2.0) + holesize;
}
double endsize = startsize + dashsize;
start = timeAtLength(startsize,segment);
end = timeAtLength(endsize,segment);
while (start < 1 && start > 0) {
result.push_back(segment.portion(start, end));
startsize = endsize + holesize;
endsize = startsize + dashsize;
start = timeAtLength(startsize,segment);
end = timeAtLength(endsize,segment);
}
}
if (curve_it2 == curve_endit) {
if (path_it.closed()) {
Geom::Path end = result[result.size()-1];
end.setFinal(result[start_index].initialPoint());
end.append(result[start_index]);
result[start_index] = end;
}
}
p_index ++;
++curve_it1;
++curve_it2;
}
} else {
double start = 0.0;
double end = 0.0;
double dashsize = length_pwd2 * dashpercent;
double holesize = length_pwd2 * holepercent;
if (halfextreme) {
end = timeAtLength(dashsize/2.0,pwd2);
} else {
end = timeAtLength(dashsize,pwd2);
}
result.push_back(path_it.portion(start, end));
double startsize = dashsize + holesize;
if (halfextreme) {
startsize = (dashsize/2.0) + holesize;
}
double endsize = startsize + dashsize;
start = timeAtLength(startsize,pwd2);
end = timeAtLength(endsize,pwd2);
while (start < path_it.size() && start > 0) {
result.push_back(path_it.portion(start, end));
startsize = endsize + holesize;
endsize = startsize + dashsize;
start = timeAtLength(startsize,pwd2);
end = timeAtLength(endsize,pwd2);
}
if (path_it.closed()) {
Geom::Path end = result[result.size()-1];
end.setFinal(result[start_index].initialPoint());
end.append(result[start_index]);
result[start_index] = end;
}
}
}
return result;
}
}; //namespace LivePathEffect
}; /* namespace Inkscape */
/*
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 :
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