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| -rw-r--r-- | src/live_effects/lpe-dynastroke.cpp | 298 |
1 files changed, 298 insertions, 0 deletions
diff --git a/src/live_effects/lpe-dynastroke.cpp b/src/live_effects/lpe-dynastroke.cpp new file mode 100644 index 0000000..b9fb7a4 --- /dev/null +++ b/src/live_effects/lpe-dynastroke.cpp @@ -0,0 +1,298 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/** \file + * LPE <dynastroke> implementation + */ +/* + * Authors: + * JF Barraud + * + * Copyright (C) JF Barraud 2007 <jf.barraud@gmail.com> + * + * Released under GNU GPL v2+, 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/bezier-to-sbasis.h> +#include <2geom/sbasis-math.h> +// TODO due to internal breakage in glibmm headers, this must be last: +#include <glibmm/i18n.h> + +namespace Inkscape { +namespace LivePathEffect { +//TODO: growfor/fadefor can be expressed in unit of width. +//TODO: make round/sharp end choices independent 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 = thinnest)"), "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 thinner near it's start"), "growfor", &wr, this, 100), + fadefor(_("Fade for:"), _("Make the stroke thinner 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(&method); + registerParameter(&width); + registerParameter(&roundness); + registerParameter(&angle); + //registerParameter(&modulo_pi) ); + registerParameter(&start_cap); + registerParameter(&growfor); + registerParameter(&end_cap); + registerParameter(&fadefor); + registerParameter(&round_ends); + registerParameter(&capping); + + width.param_set_range(0,std::numeric_limits<double>::max()); + roundness.param_set_range(0.01, 1); + angle.param_set_range(-360, 360); + growfor.param_set_range(0, std::numeric_limits<double>::max()); + fadefor.param_set_range(0, std::numeric_limits<double>::max()); + + show_orig_path = true; +} + +LPEDynastroke::~LPEDynastroke() += default; + +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 useful? 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 : |