#define INKSCAPE_LPE_PERSPECTIVE_PATH_CPP
/** \file
 * LPE <perspective_path> implementation, used as an example for a base starting class
 * when implementing new LivePathEffects.
 *
 * In vi, three global search-and-replaces will let you rename everything
 * in this and the .h file:
 *
 *   :%s/PERSPECTIVE_PATH/YOURNAME/g
 *   :%s/PerspectivePath/Yourname/g
 *   :%s/perspective_path/yourname/g
 */
/*
 * Authors:
 *   Johan Engelen
 *   Maximilian Albert
 *
 * Copyright (C) Johan Engelen 2007 <j.b.c.engelen@utwente.nl>
 * Copyright (C) Maximilian Albert 2008 <maximilian.albert@gmail.com>
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

#include "persp3d.h"
//#include "transf_mat_3x4.h"
#include "document.h"

#include "live_effects/lpe-perspective_path.h"
#include "sp-item-group.h"

#include "inkscape.h"

// You might need to include other 2geom files. You can add them here:
#include <2geom/path.h>

namespace Inkscape {
namespace LivePathEffect {

LPEPerspectivePath::LPEPerspectivePath(LivePathEffectObject *lpeobject) :
    Effect(lpeobject),
    // initialise your parameters here:
    scalex(_("Scale x"), _("Scale factor in x direction"), "scalex", &wr, this, 1.0),
    scaley(_("Scale y"), _("Scale factor in y direction"), "scaley", &wr, this, 1.0),
    offsetx(_("Offset x"), _("Offset in x direction"), "offsetx", &wr, this, 0.0),
    offsety(_("Offset y"), _("Offset in y direction"), "offsety", &wr, this, 0.0),
    uses_plane_xy(_("Uses XY plane?"), _("If true, put the path on the left side of an imaginary box, otherwise on the right side"), "uses_plane_xy", &wr, this, true)
{
    // register all your parameters here, so Inkscape knows which parameters this effect has:
    registerParameter( dynamic_cast<Parameter *>(&scalex) );
    registerParameter( dynamic_cast<Parameter *>(&scaley) );
    registerParameter( dynamic_cast<Parameter *>(&offsetx) );
    registerParameter( dynamic_cast<Parameter *>(&offsety) );
    registerParameter( dynamic_cast<Parameter *>(&uses_plane_xy) );

    concatenate_before_pwd2 = true; // don't split the path into its subpaths

    Persp3D *persp = persp3d_document_first_persp(inkscape_active_document());

    Proj::TransfMat3x4 pmat = persp->tmat;

    pmat.copy_tmat(tmat);
    
    groupSpecialBehavior = false;
}

LPEPerspectivePath::~LPEPerspectivePath()
{

}

void
LPEPerspectivePath::doBeforeEffect (SPLPEItem *lpeitem)
{
    if(SP_IS_GROUP(lpeitem))
    {
        groupSpecialBehavior = true;
        original_bbox(lpeitem);
    }    
}


Geom::Piecewise<Geom::D2<Geom::SBasis> >
LPEPerspectivePath::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
{
    using namespace Geom;

    Piecewise<D2<SBasis> > path_a_pw = pwd2_in;

    // FIXME: the minus sign is there because the SVG coordinate system goes down;
    //        remove this once we have unified coordinate systems
    path_a_pw = path_a_pw + Geom::Point(offsetx, -offsety);

    D2<Piecewise<SBasis> > B = make_cuts_independant(path_a_pw);
    Piecewise<SBasis> preimage[4];

    if(!groupSpecialBehavior)
    {
        boundingbox_X = bounds_fast(pwd2_in)[0];
        boundingbox_Y = bounds_fast(pwd2_in)[1];
    }

    Geom::Point orig = Geom::Point(uses_plane_xy ? boundingbox_X.max() : boundingbox_X.min(),
                                   boundingbox_Y.middle());
    //Geom::Point orig = Geom::Point(bounds_X.min(), bounds_Y.middle());
    //orig = Geom::Point(orig[X], sp_document_height(inkscape_active_document()) - orig[Y]);

    //double offset = uses_plane_xy ? boundingbox_X.extent() : 0.0;

    /**
    g_print ("Orig: (%8.2f, %8.2f)\n", orig[X], orig[Y]);

    g_print ("B[1] - orig[1]: %8.2f\n", (B[1] - orig[1])[0].valueAt(0));
    g_print ("B[0] - orig[0]: %8.2f\n", (B[0] - orig[0])[0].valueAt(0));
    **/

    if (uses_plane_xy) {
        preimage[0] =  (-B[0] + orig[0]) * scalex / 200.0;
        preimage[1] =  ( B[1] - orig[1]) * scaley / 400.0;
        preimage[2] =  B[0] - B[0]; // hack!
    } else {
        preimage[0] =  B[0] - B[0]; // hack!
        preimage[1] =  (B[1] - orig[1]) * scaley / 400.0;
        preimage[2] =  (B[0] - orig[0]) * scalex / 200.0;
    }

    /* set perspective origin to first point of path */
    tmat[0][3] = orig[0];
    tmat[1][3] = orig[1];

    /**
    g_print ("preimage[1]: %8.2f\n", preimage[1][0].valueAt(0));
    g_print ("preimage[2]: %8.2f\n", preimage[2][0].valueAt(0));
    **/

    Piecewise<SBasis> res[3];
    for (int j = 0; j < 3; ++j) {
        res[j] =
              preimage[0] * tmat[j][0]
            + preimage[1] * tmat[j][1]
            + preimage[2] * tmat[j][2]
            +               tmat[j][3];
    }
    D2<Piecewise<SBasis> > result(divide(res[0],res[2], 3), 
                                  divide(res[1],res[2], 3));

    Piecewise<D2<SBasis> > output = sectionize(result);

    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 :