#define INKSCAPE_LPE_SKETCH_CPP

#include "live_effects/lpe-sketch.h"

#include "display/curve.h"

#include <libnr/n-art-bpath.h>

#include <2geom/path.h>

#include <2geom/sbasis.h>

#include <2geom/sbasis-geometric.h>

#include <2geom/bezier-to-sbasis.h>

#include <2geom/sbasis-to-bezier.h>

#include <2geom/d2.h>

#include <2geom/sbasis-math.h>

#include <2geom/piecewise.h>

#include <2geom/crossing.h>

#include <2geom/path-intersection.h>

namespace Inkscape {

namespace LivePathEffect {

LPESketch::LPESketch(LivePathEffectObject *lpeobject) :

Effect(lpeobject),

// initialise your parameters here:

//testpointA(_("Test Point A"), _("Test A"), "ptA", &wr, this, Geom::Point(100,100)),

nbiter_approxstrokes(_("Nb of iterations"), _("Draw that many approximating strokes sequences."), "nbiter_approxstrokes", &wr, this, 5),

strokelength(_("Max stroke length"),

_("Maximal length of approximated strokes."), "strokelength", &wr, this, 100.),

strokelength_rdm(_("Stroke length variation"),

_("Random variation of stroke length (relative to max. length)."), "strokelength_rdm", &wr, this, .3),

strokeoverlap(_("Max. overlap"),

_("How much successive strokes should overlap (relative to max. length)."), "strokeoverlap", &wr, this, .3),

strokeoverlap_rdm(_("Overlap variation"),

_("Random variation of overlap (relative to max. overlap)"), "strokeoverlap_rdm", &wr, this, .3),

ends_tolerance(_("Max. ends tolerance"),

_("Max. distance between original and approximated paths ends (relative to max. length)."), "ends_tolerance", &wr, this, .1),

parallel_offset(_("Parallel offset"),

_("Average distance to original stroke(try 0.)."), "parallel_offset", &wr, this, 5.),

tremble_size(_("Max. tremble"),

_("Maximal tremble magnitude."), "tremble_size", &wr, this, 5.),

tremble_frequency(_("Tremble frequency"),

_("Typical nb of tremble 'period' in a stroke."), "tremble_frequency", &wr, this, 1.),

nbtangents(_("Nb of construction Lines"),

_("How many construction lines (tangents) to draw?"), "nbtangents", &wr, this, 5),

tgtscale(_("Scale"),

_("Scale factor relating curvature and length of construction lines(try 5*avarage offset) )"), "tgtscale", &wr, this, 10.0),

tgtlength(_("Max. length"), _("Max. length of construction lines."), "tgtlength", &wr, this, 100.0),

tgtlength_rdm(_("Length variation"), _("Random variation of construction lines length."), "tgtlength_rdm", &wr, this, .3)

{

// register all your parameters here, so Inkscape knows which parameters this effect has:

//Add some comment in the UI: *warning* the precise output of this effect might change in future releases!

//convert to path if you want to keep exact output unchanged in future releases...

//registerParameter( dynamic_cast<Parameter *>(&testpointA) );

registerParameter( dynamic_cast<Parameter *>(&nbiter_approxstrokes) );

registerParameter( dynamic_cast<Parameter *>(&strokelength) );

registerParameter( dynamic_cast<Parameter *>(&strokelength_rdm) );

registerParameter( dynamic_cast<Parameter *>(&strokeoverlap) );

registerParameter( dynamic_cast<Parameter *>(&strokeoverlap_rdm) );

registerParameter( dynamic_cast<Parameter *>(&ends_tolerance) );

registerParameter( dynamic_cast<Parameter *>(&parallel_offset) );

registerParameter( dynamic_cast<Parameter *>(&tremble_size) );

registerParameter( dynamic_cast<Parameter *>(&tremble_frequency) );

registerParameter( dynamic_cast<Parameter *>(&nbtangents) );

registerParameter( dynamic_cast<Parameter *>(&tgtscale) );

registerParameter( dynamic_cast<Parameter *>(&tgtlength) );

registerParameter( dynamic_cast<Parameter *>(&tgtlength_rdm) );

nbiter_approxstrokes.param_make_integer();

nbiter_approxstrokes.param_set_range(0, NR_HUGE);

strokelength.param_set_range(1, NR_HUGE);

strokelength.param_set_increments(1., 5.);

strokelength_rdm.param_set_range(0, 1.);

strokeoverlap.param_set_range(0, 1.);

strokeoverlap.param_set_increments(0.1, 0.30);

ends_tolerance.param_set_range(0., 1.);

parallel_offset.param_set_range(0, NR_HUGE);

tremble_frequency.param_set_range(0.01, 100.);

tremble_frequency.param_set_increments(.5, 1.5);

strokeoverlap_rdm.param_set_range(0, 1.);

nbtangents.param_make_integer();

nbtangents.param_set_range(0, NR_HUGE);

tgtscale.param_set_range(0, NR_HUGE);

tgtscale.param_set_increments(.1, .5);

tgtlength.param_set_range(0, NR_HUGE);

tgtlength.param_set_increments(1., 5.);

tgtlength_rdm.param_set_range(0, 1.);

}

LPESketch::~LPESketch()

{

}

std::vector<Geom::Piecewise<Geom::D2<Geom::SBasis> > >

split_at_discontinuities (Geom::Piecewise<Geom::D2<Geom::SBasis> > & pwsbin, double tol = .0001)

{

using namespace Geom;

std::vector<Piecewise<D2<SBasis> > > ret;

unsigned piece_start = 0;

for (unsigned i=0; i<pwsbin.segs.size(); i++){

if (i==(pwsbin.segs.size()-1) || L2(pwsbin.segs[i].at1()- pwsbin.segs[i+1].at0()) > tol){

Piecewise<D2<SBasis> > piece;

piece.cuts.push_back(pwsbin.cuts[piece_start]);

for (unsigned j = piece_start; j<i+1; j++){

piece.segs.push_back(pwsbin.segs[j]);

piece.cuts.push_back(pwsbin.cuts[j+1]);

}

ret.push_back(piece);

piece_start = i+1;

}

}

return ret;

}

Geom::Piecewise<Geom::D2<Geom::SBasis> >

LPESketch::computePerturbation (double s0, double s1){

using namespace Geom;

Piecewise<D2<SBasis> >res;

//global offset for this stroke.

double offsetX = parallel_offset-parallel_offset.get_value();

double offsetY = parallel_offset-parallel_offset.get_value();

Point A,dA,B,dB,offset = Point(offsetX,offsetY);

//start point A

for (unsigned dim=0; dim<2; dim++){

A[dim] = offset[dim] + 2*tremble_size-tremble_size.get_value();

dA[dim] = 2*tremble_size-tremble_size.get_value();

}

//compute howmany deg 3 sbasis to concat according to frequency.

unsigned count = unsigned((s1-s0)/strokelength*tremble_frequency)+1;

for (unsigned i=0; i<count; i++){

D2<SBasis> perturb = D2<SBasis>();

for (unsigned dim=0; dim<2; dim++){

B[dim] = offset[dim] + 2*tremble_size-tremble_size.get_value();

perturb[dim].push_back(Linear(A[dim],B[dim]));

dA[dim] = dA[dim]-B[dim]+A[dim];

dB[dim] = 2*tremble_size-tremble_size.get_value();

perturb[dim].push_back(Linear(dA[dim],dB[dim]));

}

A = B;

dA = B-A-dB;

res.concat(Piecewise<D2<SBasis> >(perturb));

}

res.setDomain(Interval(s0,s0+count*strokelength/tremble_frequency));

return res;

}

Geom::Piecewise<Geom::D2<Geom::SBasis> >

LPESketch::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > & pwd2_in)

{

using namespace Geom;

Piecewise<D2<SBasis> > output;

//init random parameters.

parallel_offset.resetRandomizer();

strokelength_rdm.resetRandomizer();

strokeoverlap_rdm.resetRandomizer();

tgtlength_rdm.resetRandomizer();

// some variables for futur use.

// notations will be : t = path time, s = distance from start along the path.

Piecewise<SBasis> pathlength;

std::vector<double> times;

double total_length;

//TODO: split Construction Lines/Approximated Strokes into two separate effects?

//----- Approximated Strokes.

//TODO: choose length & offset according to curvature?

//TODO: retrieve components from path, dont merge to separate afterward! + know if closed!

std::vector<Piecewise<D2<SBasis> > > pieces_in = split_at_discontinuities (pwd2_in);

//work separately on each component.

for (unsigned pieceidx = 0; pieceidx < pieces_in.size(); pieceidx++){

Piecewise<D2<SBasis> > piece = pieces_in[pieceidx];

Piecewise<SBasis> piecelength = arcLengthSb(piece,.1);

pathlength.concat(piecelength);

total_length = piecelength.segs.back().at1()-piecelength.segs.front().at0();

//TODO: better check this on the Geom::Path.

bool closed = piece.segs.front().at0() == piece.segs.back().at1();

if (closed){

piece.concat(piece);

piecelength.concat(piecelength+total_length);

}

for (unsigned i = 0; i<nbiter_approxstrokes; i++){

//Basic steps:

//- Choose a rdm seg [s0,s1], find coresponding [t0,t1],

//- Pick a rdm perturbation delta(s), collect 'piece(t)+delta(s(t))' over [t0,t1] into output.

// pick a point where to start the stroke (s0 = dist from start).

double s1=0.,s0 = ends_tolerance*strokelength+0.0001;//the root finder might miss 0.

double t1, t0;

double s0_initial = s0;

bool done = false;// was the end of the component reached?

while (!done){

// if the start point is already too far... do nothing. (this should not happen!)

assert (s0>=0);//this should not happen!!

if (!closed && s1>total_length - ends_tolerance.get_value()*strokelength) break;

if ( closed && s0>total_length + s0_initial) break;

times = roots(piecelength-s0);

if (times.size()==0) break;//we should not be there.

t0 = times[0];

// pick a new end point (s1 = s0 + strokelength).

s1 = s0 + strokelength*(1-strokelength_rdm);

// don't let it go beyond the end of the orgiginal path.

// TODO/FIXME: this might result in short strokes near the end...

if (!closed && s1>total_length-ends_tolerance.get_value()*strokelength){

done = true;

//!!the root solver might miss s1==total_length...

if (s1>total_length){s1 = total_length - ends_tolerance*strokelength-0.0001;}

}

if (closed && s1>total_length + s0_initial){

done = true;

if (closed && s1>2*total_length){s1 = 2*total_length - strokeoverlap*(1-strokeoverlap_rdm)*strokelength-0.0001;}

}

times = roots(piecelength-s1);

if (times.size()==0) break;//we should not be there.

t1 = times[0];

//pick a rdm perturbation, and collect the perturbed piece into output.

Piecewise<D2<SBasis> > pwperturb = computePerturbation(s0,s1);

pwperturb = compose(pwperturb,portion(piecelength,t0,t1));

output.concat(portion(piece,t0,t1)+pwperturb);

//step points: s0 = s1 - overlap.

//TODO: make sure this has to end?

s0 = s1 - strokeoverlap*(1-strokeoverlap_rdm)*(s1-s0);

}

}

}

//----- Construction lines.

//TODO: choose places according to curvature?.

//at this point we have:

//pathlength = arcLengthSb(pwd2_in,.1);

total_length = pathlength.segs.back().at1();

Piecewise<D2<SBasis> > m = pwd2_in;

Piecewise<D2<SBasis> > v = derivative(pwd2_in);

Piecewise<D2<SBasis> > a = derivative(v);

for (unsigned i=0; i<nbtangents; i++){

// pick a point where to draw a tangent (s = dist from start along path).

double s = total_length * ( i + tgtlength_rdm ) / (nbtangents+1.);

times = roots(pathlength-s);

assert(times.size()>0);//there should be one and only one solution!

double t = times[0];

Point m_t = m(t), v_t = v(t), a_t = a(t);

//Compute tgt length according to curvature (not exceeding tgtlength) so that

// dist to origninal curve ~ 4 * (parallel_offset+tremble_size).

//TODO: put this 4 as a parameter in the UI...

//TODO: what if with v=0?

double l = tgtlength*(1-tgtlength_rdm)/v_t.length();

double r = pow(v_t.length(),3)/cross(a_t,v_t);

r = sqrt((2*fabs(r)-tgtscale)*tgtscale)/v_t.length();

l=(r<l)?r:l;

//collect the tgt segment into output.

D2<SBasis> tgt = D2<SBasis>();

for (unsigned dim=0; dim<2; dim++){

tgt[dim] = SBasis(Linear(m_t[dim]-v_t[dim]*l, m_t[dim]+v_t[dim]*l));

}

output.concat(Piecewise<D2<SBasis> >(tgt));

}

//output.concat(m);

return output;

}

} //namespace LivePathEffect (setq default-directory "c:/Documents And Settings/jf/Mes Documents/InkscapeSVN")

} /* namespace Inkscape */