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#define INKSCAPE_LPE_RULER_CPP
/** \file
* LPE <ruler> implementation, see lpe-ruler.cpp.
*/
/*
* Authors:
* Maximilian Albert
*
* Copyright (C) Maximilian Albert 2008 <maximilian.albert@gmail.com>
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include "live_effects/lpe-ruler.h"
#include <2geom/piecewise.h>
#include <2geom/sbasis-geometric.h>
#include "inkscape.h"
#include "desktop.h"
namespace Inkscape {
namespace LivePathEffect {
static const Util::EnumData<MarkDirType> MarkDirData[] = {
{MARKDIR_LEFT , N_("Left"), "left"},
{MARKDIR_RIGHT , N_("Right"), "right"},
{MARKDIR_BOTH , N_("Both"), "both"},
};
static const Util::EnumDataConverter<MarkDirType> MarkDirTypeConverter(MarkDirData, sizeof(MarkDirData)/sizeof(*MarkDirData));
static const Util::EnumData<BorderMarkType> BorderMarkData[] = {
{BORDERMARK_NONE , N_("None"), "none"},
{BORDERMARK_START , N_("Start"), "start"},
{BORDERMARK_END , N_("End"), "end"},
{BORDERMARK_BOTH , N_("Both"), "both"},
};
static const Util::EnumDataConverter<BorderMarkType> BorderMarkTypeConverter(BorderMarkData, sizeof(BorderMarkData)/sizeof(*BorderMarkData));
LPERuler::LPERuler(LivePathEffectObject *lpeobject) :
Effect(lpeobject),
mark_distance(_("_Mark distance:"), _("Distance between successive ruler marks"), "mark_distance", &wr, this, 20.0),
unit(_("Unit:"), _("Unit"), "unit", &wr, this),
mark_length(_("Ma_jor length:"), _("Length of major ruler marks"), "mark_length", &wr, this, 14.0),
minor_mark_length(_("Mino_r length:"), _("Length of minor ruler marks"), "minor_mark_length", &wr, this, 7.0),
major_mark_steps(_("Major steps_:"), _("Draw a major mark every ... steps"), "major_mark_steps", &wr, this, 5),
shift(_("Shift marks _by:"), _("Shift marks by this many steps"), "shift", &wr, this, 0),
mark_dir(_("Mark direction:"), _("Direction of marks (when viewing along the path from start to end)"), "mark_dir", MarkDirTypeConverter, &wr, this, MARKDIR_LEFT),
offset(_("_Offset:"), _("Offset of first mark"), "offset", &wr, this, 0.0),
border_marks(_("Border marks:"), _("Choose whether to draw marks at the beginning and end of the path"), "border_marks", BorderMarkTypeConverter, &wr, this, BORDERMARK_BOTH)
{
registerParameter(dynamic_cast<Parameter *>(&unit));
registerParameter(dynamic_cast<Parameter *>(&mark_distance));
registerParameter(dynamic_cast<Parameter *>(&mark_length));
registerParameter(dynamic_cast<Parameter *>(&minor_mark_length));
registerParameter(dynamic_cast<Parameter *>(&major_mark_steps));
registerParameter(dynamic_cast<Parameter *>(&shift));
registerParameter(dynamic_cast<Parameter *>(&offset));
registerParameter(dynamic_cast<Parameter *>(&mark_dir));
registerParameter(dynamic_cast<Parameter *>(&border_marks));
major_mark_steps.param_make_integer();
major_mark_steps.param_set_range(1, 1000);
shift.param_make_integer();
mark_length.param_set_increments(1.0, 10.0);
minor_mark_length.param_set_increments(1.0, 10.0);
offset.param_set_increments(1.0, 10.0);
}
LPERuler::~LPERuler()
{
}
Geom::Point LPERuler::n_major;
Geom::Point LPERuler::n_minor;
Geom::Piecewise<Geom::D2<Geom::SBasis> >
LPERuler::ruler_mark(Geom::Point const &A, Geom::Point const &n, MarkType const &marktype)
{
using namespace Geom;
gboolean success;
double real_mark_length = mark_length;
success = sp_convert_distance(&real_mark_length, unit, &sp_unit_get_by_id(SP_UNIT_PX));
double real_minor_mark_length = minor_mark_length;
success = sp_convert_distance(&real_minor_mark_length, unit, &sp_unit_get_by_id(SP_UNIT_PX));
n_major = real_mark_length * n;
n_minor = real_minor_mark_length * n;
if (mark_dir == MARKDIR_BOTH) {
n_major = n_major * 0.5;
n_minor = n_minor * 0.5;
}
Point C, D;
switch (marktype) {
case MARK_MAJOR:
C = A;
D = A + n_major;
if (mark_dir == MARKDIR_BOTH)
C -= n_major;
break;
case MARK_MINOR:
C = A;
D = A + n_minor;
if (mark_dir == MARKDIR_BOTH)
C -= n_minor;
break;
default:
// do nothing
break;
}
Piecewise<D2<SBasis> > seg(D2<SBasis>(Linear(C[X], D[X]), Linear(C[Y], D[Y])));
return seg;
}
Geom::Piecewise<Geom::D2<Geom::SBasis> >
LPERuler::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
{
using namespace Geom;
const int mminterval = static_cast<int>(major_mark_steps);
const int i_shift = static_cast<int>(shift) % mminterval;
int sign = (mark_dir == MARKDIR_RIGHT ? 1 : -1 );
Piecewise<D2<SBasis> >output(pwd2_in);
Piecewise<D2<SBasis> >speed = derivative(pwd2_in);
Piecewise<SBasis> arclength = arcLengthSb(pwd2_in);
double totlength = arclength.lastValue();
//find at which times to draw a mark:
std::vector<double> s_cuts;
double real_mark_distance = mark_distance;
gboolean success = sp_convert_distance(&real_mark_distance, unit, &sp_unit_get_by_id(SP_UNIT_PX));
double real_offset = offset;
success = sp_convert_distance(&real_offset, unit, &sp_unit_get_by_id(SP_UNIT_PX));
for (double s = real_offset; s<totlength; s+=real_mark_distance){
s_cuts.push_back(s);
}
std::vector<std::vector<double> > roots = multi_roots(arclength, s_cuts);
std::vector<double> t_cuts;
for (unsigned v=0; v<roots.size();v++){
//FIXME: 2geom multi_roots solver seem to sometimes "repeat" solutions.
//Here, we are supposed to have one and only one solution for each s.
if(roots[v].size()>0)
t_cuts.push_back(roots[v][0]);
}
//draw the marks
for (unsigned i=0; i<t_cuts.size(); i++){
Point A = pwd2_in(t_cuts[i]);
Point n = rot90(unit_vector(speed(t_cuts[i])))*sign;
if ((i % mminterval) == i_shift) {
output.concat (ruler_mark(A, n, MARK_MAJOR));
} else {
output.concat (ruler_mark(A, n, MARK_MINOR));
}
}
//eventually draw a mark at start
if ((border_marks == BORDERMARK_START || border_marks == BORDERMARK_BOTH) && (offset != 0.0 || i_shift != 0)){
Point A = pwd2_in.firstValue();
Point n = rot90(unit_vector(speed.firstValue()))*sign;
output.concat (ruler_mark(A, n, MARK_MAJOR));
}
//eventually draw a mark at end
if (border_marks == BORDERMARK_END || border_marks == BORDERMARK_BOTH){
Point A = pwd2_in.lastValue();
Point n = rot90(unit_vector(speed.lastValue()))*sign;
//speed.lastValue() is somtimes wrong when the path is closed: a tiny line seg might added at the end to fix rounding errors...
//TODO: Find a better fix!! (How do we know if the path was closed?)
if ( A == pwd2_in.firstValue() &&
speed.segs.size() > 1 &&
speed.segs.back()[X].size() <= 1 &&
speed.segs.back()[Y].size() <= 1 &&
speed.segs.back()[X].tailError(0) <= 1e-10 &&
speed.segs.back()[Y].tailError(0) <= 1e-10
){
n = rot90(unit_vector(speed.segs[speed.segs.size()-2].at1()))*sign;
}
output.concat (ruler_mark(A, n, MARK_MAJOR));
}
return output;
}
} //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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