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#define INKSCAPE_LPE_DYNASTROKE_CPP
/** \file
* LPE <dynastroke> implementation
*/
/*
* Authors:
* JF Barraud
*
* Copyright (C) JF Barraud 2007 <jf.barraud@gmail.com>
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include "live_effects/lpe-dynastroke.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/d2-sbasis.h>
#include <2geom/sbasis-math.h>
#include <2geom/piecewise.h>
namespace Inkscape {
namespace LivePathEffect {
//----------------------------------------------------------
//--- TODO: Test this and move to 2Geom --------------------
//----------------------------------------------------------
static
std::vector<double>
find_corners (Geom::Piecewise<Geom::D2<Geom::SBasis> > const &m){
using namespace Geom;
std::vector<double> output = std::vector<double>();
Piecewise<D2<SBasis> > v = derivative(m);
for (unsigned i=0; i<m.size()-1; i++){
if ( m.segs[i].at1() == m.segs[i+1].at0() &&
v.segs[i].at1() != v.segs[i+1].at0()){
output.push_back(m.cuts[i+1]);
}
}
return output;
}
//----------------------------------------------------------
//----------------------------------------------------------
//----------------------------------------------------------
//TODO: growfor/fadefor can be expressed in unit of width.
//TODO: make round/sharp end choices independant for start and end.
//TODO: define more styles like in calligtool.
//TODO: allow fancy ends.
static const Util::EnumData<DynastrokeMethod> DynastrokeMethodData[DSM_END] = {
{DSM_ELLIPTIC_PEN, N_("Elliptic Pen"), "elliptic_pen"},
{DSM_THICKTHIN_FAST, N_("Thick-Thin strokes (fast)"), "thickthin_fast"},
{DSM_THICKTHIN_SLOW, N_("Thick-Thin strokes (slow)"), "thickthin_slow"}
};
static const Util::EnumDataConverter<DynastrokeMethod> DSMethodConverter(DynastrokeMethodData, DSM_END);
static const Util::EnumData<DynastrokeCappingType> DynastrokeCappingTypeData[DSCT_END] = {
{DSCT_SHARP, N_("Sharp"), "sharp"},
{DSCT_ROUND, N_("Round"), "round"},
};
static const Util::EnumDataConverter<DynastrokeCappingType> DSCTConverter(DynastrokeCappingTypeData, DSCT_END);
LPEDynastroke::LPEDynastroke(LivePathEffectObject *lpeobject) :
Effect(lpeobject),
// initialise your parameters here:
method(_("Method"), _("Choose pen type"), "method", DSMethodConverter, &wr, this, DSM_THICKTHIN_FAST),
width(_("Pen width"), _("Maximal stroke width"), "width", &wr, this, 25),
roundness(_("Pen roundness"), _("Min/Max width ratio"), "roundness", &wr, this, .2),
angle(_("angle"), _("direction of thickest strokes (opposite = thinest)"), "angle", &wr, this, 45),
// modulo_pi(_("modulo pi"), _("Give forward and backward moves in one direction the same thickness "), "modulo_pi", &wr, this, false),
start_cap(_("Start"), _("Choose start capping type"), "start_cap", DSCTConverter, &wr, this, DSCT_SHARP),
end_cap(_("End"), _("Choose end capping type"), "end_cap", DSCTConverter, &wr, this, DSCT_SHARP),
growfor(_("Grow for"), _("Make the stroke thiner near it's start"), "growfor", &wr, this, 100),
fadefor(_("Fade for"), _("Make the stroke thiner near it's end"), "fadefor", &wr, this, 100),
round_ends(_("Round ends"), _("Strokes end with a round end"), "round_ends", &wr, this, false),
capping(_("Capping"), _("left capping"), "capping", &wr, this, "M 100,5 C 50,5 0,0 0,0 0,0 50,-5 100,-5")
{
registerParameter( dynamic_cast<Parameter *>(& method) );
registerParameter( dynamic_cast<Parameter *>(& width) );
registerParameter( dynamic_cast<Parameter *>(& roundness) );
registerParameter( dynamic_cast<Parameter *>(& angle) );
//registerParameter( dynamic_cast<Parameter *>(& modulo_pi) );
registerParameter( dynamic_cast<Parameter *>(& start_cap) );
registerParameter( dynamic_cast<Parameter *>(& growfor) );
registerParameter( dynamic_cast<Parameter *>(& end_cap) );
registerParameter( dynamic_cast<Parameter *>(& fadefor) );
registerParameter( dynamic_cast<Parameter *>(& round_ends) );
registerParameter( dynamic_cast<Parameter *>(& capping) );
width.param_set_range(0, Geom::infinity());
roundness.param_set_range(0.01, 1);
angle.param_set_range(-360, 360);
growfor.param_set_range(0, Geom::infinity());
fadefor.param_set_range(0, Geom::infinity());
show_orig_path = true;
}
LPEDynastroke::~LPEDynastroke()
{
}
Geom::Piecewise<Geom::D2<Geom::SBasis> >
LPEDynastroke::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
{
using namespace Geom;
std::cout<<"do effect: debut\n";
Piecewise<D2<SBasis> > output;
Piecewise<D2<SBasis> > m = pwd2_in;
Piecewise<D2<SBasis> > v = derivative(m);;
Piecewise<D2<SBasis> > n = unitVector(v);
n = rot90(n);
Piecewise<D2<SBasis> > n1,n2;
// for (unsigned i=0; i<n.size(); i++){
// std::cout<<n[i][X]<<"\n";
// }
// return m + unitVector(v);
#if 0
Piecewise<SBasis> k = curvature(m);
OptInterval mag = bounds_exact(k);
//TODO test if mag is non empty...
k = (k-mag->min())*width/mag->extent() + (roundness*width);
Piecewise<D2<SBasis> > left = m + k*n;
Piecewise<D2<SBasis> > right = m - k*n;
right = compose(right,Linear(right.cuts.back(),right.cuts.front()));
D2<SBasis> line;
line[X] = Linear(left.lastValue()[X],right.firstValue()[X]);
line[Y] = Linear(left.lastValue()[Y],right.firstValue()[Y]);
output = left;
output.concat(Piecewise<D2<SBasis> >(line));
output.concat(right);
line[X] = Linear(right.lastValue()[X],left.firstValue()[X]);
line[Y] = Linear(right.lastValue()[Y],left.firstValue()[Y]);
output.concat(Piecewise<D2<SBasis> >(line));
return output;
#else
double angle_rad = angle*M_PI/180.;//TODO: revert orientation?...
Piecewise<SBasis> w;
std::vector<double> corners = find_corners(m);
DynastrokeMethod stroke_method = method.get_value();
if (roundness==1.) {
std::cout<<"round pen.\n";
n1 = n*double(width);
n2 =-n1;
}else{
switch(stroke_method) {
case DSM_ELLIPTIC_PEN:{
std::cout<<"ellptic pen\n";
//FIXME: roundness=0???
double c = cos(angle_rad), s = sin(angle_rad);
Affine rot,slant;
rot = Affine(c, -s, s, c, 0, 0 );
slant = Affine(double(width)*roundness, 0, 0, double(width), 0, 0 );
Piecewise<D2<SBasis> > nn = unitVector(v * ( rot * slant ) );
slant = Affine( 0,-roundness, 1, 0, 0, 0 );
rot = Affine(-s, -c, c, -s, 0, 0 );
nn = nn * (slant * rot );
n1 = nn*double(width);
n2 =-n1;
break;
}
case DSM_THICKTHIN_FAST:{
std::cout<<"fast thick thin pen\n";
D2<Piecewise<SBasis> > n_xy = make_cuts_independent(n);
w = n_xy[X]*sin(angle_rad) - n_xy[Y]*cos(angle_rad);
w = w * ((1 - roundness)*width/2.) + ((1 + roundness)*width/2.);
n1 = w*n;
n2 = -n1;
break;
}
case DSM_THICKTHIN_SLOW:{
std::cout<<"slow thick thin pen\n";
D2<Piecewise<SBasis> > n_xy = make_cuts_independent(n);
w = n_xy[X]*cos(angle_rad)+ n_xy[Y]*sin(angle_rad);
w = w * ((1 - roundness)*width/2.) + ((1 + roundness)*width/2.);
//->Slower and less stable, but more accurate .
// General formula: n1 = w*u with ||u||=1 and u.v = -dw/dt
Piecewise<SBasis> dw = derivative(w);
Piecewise<SBasis> ncomp = sqrt(dot(v,v)-dw*dw,.1,3);
//FIXME: is force continuity usefull? compatible with corners?
std::cout<<"ici\n";
n1 = -dw*v + ncomp*rot90(v);
n1 = w*force_continuity(unitVector(n1),.1);
n2 = -dw*v - ncomp*rot90(v);
n2 = w*force_continuity(unitVector(n2),.1);
std::cout<<"ici2\n";
break;
}
default:{
n1 = n*double(width);
n2 = n1*(-.5);
break;
}
}//case
}//if/else
//
//TODO: insert relevant stitch at each corner!!
//
Piecewise<D2<SBasis> > left, right;
if ( m.segs.front().at0() == m.segs.back().at1()){
// if closed:
std::cout<<"closed input.\n";
left = m + n1;//+ n;
right = m + n2;//- n;
} else {
//if not closed, shape the ends:
//TODO: allow fancy ends...
std::cout<<"shaping the ends\n";
double grow_length = growfor;// * width;
double fade_length = fadefor;// * width;
Piecewise<SBasis > s = arcLengthSb(m);
double totlength = s.segs.back().at1();
//scale factor for a sharp start
SBasis join = SBasis(2,Linear(0,1));
join[1] = Linear(1,1);
Piecewise<SBasis > factor_in = Piecewise<SBasis >(join);
factor_in.cuts[1]=grow_length;
if (grow_length < totlength){
factor_in.concat(Piecewise<SBasis >(Linear(1)));
factor_in.cuts[2]=totlength;
}
std::cout<<"shaping the ends ici\n";
//scale factor for a sharp end
join[0] = Linear(1,0);
join[1] = Linear(1,1);
Piecewise<SBasis > factor_out;
if (fade_length < totlength){
factor_out = Piecewise<SBasis >(Linear(1));
factor_out.cuts[1] = totlength-fade_length;
factor_out.concat(Piecewise<SBasis >(join));
factor_out.cuts[2] = totlength;
}else{
factor_out = Piecewise<SBasis >(join);
factor_out.setDomain(Interval(totlength-fade_length,totlength));
}
std::cout<<"shaping the ends ici ici\n";
Piecewise<SBasis > factor = factor_in*factor_out;
n1 = compose(factor,s)*n1;
n2 = compose(factor,s)*n2;
left = m + n1;
right = m + n2;
std::cout<<"shaping the ends ici ici ici\n";
if (start_cap.get_value() == DSCT_ROUND){
std::cout<<"shaping round start\n";
SBasis tau(2,Linear(0));
tau[1] = Linear(-1,0);
Piecewise<SBasis > hbump;
hbump.concat(Piecewise<SBasis >(tau*grow_length));
hbump.concat(Piecewise<SBasis >(Linear(0)));
hbump.cuts[0]=0;
hbump.cuts[1]=fmin(grow_length,totlength*grow_length/(grow_length+fade_length));
hbump.cuts[2]=totlength;
hbump = compose(hbump,s);
left += - hbump * rot90(n);
right += - hbump * rot90(n);
}
if (end_cap.get_value() == DSCT_ROUND){
std::cout<<"shaping round end\n";
SBasis tau(2,Linear(0));
tau[1] = Linear(0,1);
Piecewise<SBasis > hbump;
hbump.concat(Piecewise<SBasis >(Linear(0)));
hbump.concat(Piecewise<SBasis >(tau*fade_length));
hbump.cuts[0]=0;
hbump.cuts[1]=fmax(totlength-fade_length, totlength*grow_length/(grow_length+fade_length));
hbump.cuts[2]=totlength;
hbump = compose(hbump,s);
left += - hbump * rot90(n);
right += - hbump * rot90(n);
}
}
left = force_continuity(left);
right = force_continuity(right);
std::cout<<"gathering result: left";
output = left;
std::cout<<" + reverse(right)";
output.concat(reverse(right));
std::cout<<". done\n";
//-----------
return output;
#endif
}
/* ######################## */
} //namespace LivePathEffect (setq default-directory "c:/Documents And Settings/jf/Mes Documents/InkscapeSVN")
} /* 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 :
|