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* @brief LPE perspective path effect implementation.
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* Maximilian Albert <maximilian.albert@gmail.com>
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* Johan Engelen <j.b.c.engelen@utwente.nl>
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* Copyright (C) 2007-2008 Authors
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* Released under GNU GPL, read the file 'COPYING' for more information
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//#include "transf_mat_3x4.h"
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#include "live_effects/lpe-perspective_path.h"
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#include "sp-item-group.h"
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#include <2geom/path.h>
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namespace LivePathEffect {
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class KnotHolderEntityOffset : public LPEKnotHolderEntity
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virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);
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virtual Geom::Point knot_get();
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LPEPerspectivePath::LPEPerspectivePath(LivePathEffectObject *lpeobject) :
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// initialise your parameters here:
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scalex(_("Scale x"), _("Scale factor in x direction"), "scalex", &wr, this, 1.0),
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scaley(_("Scale y"), _("Scale factor in y direction"), "scaley", &wr, this, 1.0),
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offsetx(_("Offset x"), _("Offset in x direction"), "offsetx", &wr, this, 0.0),
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offsety(_("Offset y"), _("Offset in y direction"), "offsety", &wr, this, 0.0),
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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)
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// register all your parameters here, so Inkscape knows which parameters this effect has:
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registerParameter( dynamic_cast<Parameter *>(&scalex) );
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registerParameter( dynamic_cast<Parameter *>(&scaley) );
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registerParameter( dynamic_cast<Parameter *>(&offsetx) );
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registerParameter( dynamic_cast<Parameter *>(&offsety) );
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registerParameter( dynamic_cast<Parameter *>(&uses_plane_xy) );
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registerKnotHolderHandle(new PP::KnotHolderEntityOffset(), _("Adjust the origin"));
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concatenate_before_pwd2 = true; // don't split the path into its subpaths
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Persp3D *persp = persp3d_document_first_persp(inkscape_active_document());
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Proj::TransfMat3x4 pmat = persp->tmat;
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LPEPerspectivePath::~LPEPerspectivePath()
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LPEPerspectivePath::doBeforeEffect (SPLPEItem *lpeitem)
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original_bbox(lpeitem, true);
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Geom::Piecewise<Geom::D2<Geom::SBasis> >
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LPEPerspectivePath::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
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Piecewise<D2<SBasis> > path_a_pw = pwd2_in;
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// FIXME: the minus sign is there because the SVG coordinate system goes down;
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// remove this once we have unified coordinate systems
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path_a_pw = path_a_pw + Geom::Point(offsetx, -offsety);
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D2<Piecewise<SBasis> > B = make_cuts_independent(path_a_pw);
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Piecewise<SBasis> preimage[4];
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//Geom::Point orig = Geom::Point(bounds_X.min(), bounds_Y.middle());
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//orig = Geom::Point(orig[X], sp_document_height(inkscape_active_document()) - orig[Y]);
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//double offset = uses_plane_xy ? boundingbox_X.extent() : 0.0;
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orig = Point(uses_plane_xy ? boundingbox_X.max() : boundingbox_X.min(), boundingbox_Y.middle());
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g_print ("Orig: (%8.2f, %8.2f)\n", orig[X], orig[Y]);
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g_print ("B[1] - orig[1]: %8.2f\n", (B[1] - orig[1])[0].valueAt(0));
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g_print ("B[0] - orig[0]: %8.2f\n", (B[0] - orig[0])[0].valueAt(0));
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preimage[0] = (-B[0] + orig[0]) * scalex / 200.0;
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preimage[1] = ( B[1] - orig[1]) * scaley / 400.0;
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preimage[2] = B[0] - B[0]; // hack!
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preimage[0] = B[0] - B[0]; // hack!
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preimage[1] = (B[1] - orig[1]) * scaley / 400.0;
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preimage[2] = (B[0] - orig[0]) * scalex / 200.0;
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/* set perspective origin to first point of path */
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tmat[0][3] = orig[0];
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tmat[1][3] = orig[1];
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g_print ("preimage[1]: %8.2f\n", preimage[1][0].valueAt(0));
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g_print ("preimage[2]: %8.2f\n", preimage[2][0].valueAt(0));
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Piecewise<SBasis> res[3];
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for (int j = 0; j < 3; ++j) {
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preimage[0] * tmat[j][0]
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+ preimage[1] * tmat[j][1]
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+ preimage[2] * tmat[j][2]
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D2<Piecewise<SBasis> > result(divide(res[0],res[2], 3),
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divide(res[1],res[2], 3));
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Piecewise<D2<SBasis> > output = sectionize(result);
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// TODO: make this more generic
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static LPEPerspectivePath *
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get_effect(SPItem *item)
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Effect *effect = sp_lpe_item_get_current_lpe(SP_LPE_ITEM(item));
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if (effect->effectType() != PERSPECTIVE_PATH) {
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g_print ("Warning: Effect is not of type LPEPerspectivePath!\n");
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return static_cast<LPEPerspectivePath *>(effect);
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KnotHolderEntityOffset::knot_set(Geom::Point const &p, Geom::Point const &origin, guint /*state*/)
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using namespace Geom;
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LPEPerspectivePath* lpe = get_effect(item);
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Geom::Point const s = snap_knot_position(p);
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lpe->offsetx.param_set_value((s - origin)[Geom::X]);
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lpe->offsety.param_set_value(-(s - origin)[Geom::Y]); // additional minus sign is due to coordinate system flipping
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// FIXME: this should not directly ask for updating the item. It should write to SVG, which triggers updating.
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sp_lpe_item_update_patheffect (SP_LPE_ITEM(item), false, true);
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KnotHolderEntityOffset::knot_get()
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LPEPerspectivePath* lpe = get_effect(item);
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return lpe->orig + Geom::Point(lpe->offsetx, -lpe->offsety);
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} //namespace LivePathEffect
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} /* namespace Inkscape */
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c-file-style:"stroustrup"
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c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
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// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :