/** @file * @brief LPE perspective path effect implementation. */ /* Authors: * Maximilian Albert <maximilian.albert@gmail.com> * Johan Engelen <j.b.c.engelen@utwente.nl> * * Copyright (C) 2007-2008 Authors * * 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" #include <2geom/path.h> namespace Inkscape { namespace LivePathEffect { namespace PP { class KnotHolderEntityOffset : public LPEKnotHolderEntity { public: virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state); virtual Geom::Point knot_get(); }; } // namespace PP 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) ); registerKnotHolderHandle(new PP::KnotHolderEntityOffset(), _("Adjust the origin")); 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); } LPEPerspectivePath::~LPEPerspectivePath() { } void LPEPerspectivePath::doBeforeEffect (SPLPEItem *lpeitem) { original_bbox(lpeitem, true); } 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_independent(path_a_pw); Piecewise<SBasis> preimage[4]; //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; orig = Point(uses_plane_xy ? boundingbox_X.max() : boundingbox_X.min(), boundingbox_Y.middle()); /** 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 PP { // TODO: make this more generic static LPEPerspectivePath * get_effect(SPItem *item) { Effect *effect = sp_lpe_item_get_current_lpe(SP_LPE_ITEM(item)); if (effect->effectType() != PERSPECTIVE_PATH) { g_print ("Warning: Effect is not of type LPEPerspectivePath!\n"); return NULL; } return static_cast<LPEPerspectivePath *>(effect); } void KnotHolderEntityOffset::knot_set(Geom::Point const &p, Geom::Point const &origin, guint /*state*/) { using namespace Geom; LPEPerspectivePath* lpe = get_effect(item); Geom::Point const s = snap_knot_position(p); lpe->offsetx.param_set_value((s - origin)[Geom::X]); lpe->offsety.param_set_value(-(s - origin)[Geom::Y]); // additional minus sign is due to coordinate system flipping // FIXME: this should not directly ask for updating the item. It should write to SVG, which triggers updating. sp_lpe_item_update_patheffect (SP_LPE_ITEM(item), false, true); } Geom::Point KnotHolderEntityOffset::knot_get() { LPEPerspectivePath* lpe = get_effect(item); return lpe->orig + Geom::Point(lpe->offsetx, -lpe->offsety); } } // namespace PP } //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:encoding=utf-8:textwidth=99 :