Update to experimental r13389

(bzr r13090.1.81)

6 files changed, 503 insertions, 1 deletions

diff --git a/src/live_effects/CMakeLists.txt b/src/live_effects/CMakeLists.txt
index c7547ded3..c3ce31cfc 100644
--- a/src/live_effects/CMakeLists.txt
+++ b/src/live_effects/CMakeLists.txt
@@ -15,6 +15,7 @@ set(live_effects_SRC
 	lpe-dynastroke.cpp
 	lpe-ellipse-5pts.cpp
 	lpe-envelope.cpp
+	lpe-envelope-perspective.cpp
 	lpe-extrude.cpp
 	lpe-fill-between-many.cpp
 	lpe-fill-between-strokes.cpp
@@ -43,6 +44,7 @@ set(live_effects_SRC
 	lpe-bspline.cpp
 	lpe-text_label.cpp
 	lpe-vonkoch.cpp
+	lpe-envelope-perspective.cpp
 	lpegroupbbox.cpp
 	lpeobject-reference.cpp
 	lpeobject.cpp
@@ -113,6 +115,7 @@ set(live_effects_SRC
 	lpe-bspline.h
 	lpe-text_label.h
 	lpe-vonkoch.h
+	lpe-envelope-perspective.h
 	lpegroupbbox.h
 	lpeobject-reference.h
 	lpeobject.h
diff --git a/src/live_effects/Makefile_insert b/src/live_effects/Makefile_insert
index 922a4a966..3d474d00c 100644
--- a/src/live_effects/Makefile_insert
+++ b/src/live_effects/Makefile_insert
@@ -104,4 +104,6 @@ ink_common_sources += \
 	live_effects/lpe-jointype.cpp	\
 	live_effects/lpe-jointype.h	\
 	live_effects/lpe-taperstroke.cpp	\
-	live_effects/lpe-taperstroke.h 
+	live_effects/lpe-taperstroke.h 	\
+	live_effects/lpe-envelope-perspective.cpp	\
+	live_effects/lpe-envelope-perspective.h
diff --git a/src/live_effects/effect-enum.h b/src/live_effects/effect-enum.h
index 82ce36225..92f35fc72 100644
--- a/src/live_effects/effect-enum.h
+++ b/src/live_effects/effect-enum.h
@@ -60,6 +60,7 @@ enum EffectType {
     BOUNDING_BOX,
     JOIN_TYPE,
     TAPER_STROKE,
+    ENVELOPE_PERSPECTIVE,
     INVALID_LPE // This must be last (I made it such that it is not needed anymore I think..., Don't trust on it being last. - johan)
 };
 
diff --git a/src/live_effects/effect.cpp b/src/live_effects/effect.cpp
index 3c13ee9a9..4157e14d7 100644
--- a/src/live_effects/effect.cpp
+++ b/src/live_effects/effect.cpp
@@ -57,6 +57,7 @@
 #include "live_effects/lpe-bounding-box.h"
 #include "live_effects/lpe-jointype.h"
 #include "live_effects/lpe-taperstroke.h"
+#include "live_effects/lpe-envelope-perspective.h"
 
 #include "xml/node-event-vector.h"
 #include "sp-object.h"
@@ -144,6 +145,7 @@ const Util::EnumData<EffectType> LPETypeData[] = {
 /* 0.91 */
     {SIMPLIFY,               N_("Simplify"),     "simplify"},
     {LATTICE2,               N_("Lattice Deformation 2"),     "lattice2"},
+    {ENVELOPE_PERSPECTIVE,  N_("Envelope-Perspective"),        "envelope-perspective"},
 };
 const Util::EnumDataConverter<EffectType> LPETypeConverter(LPETypeData, sizeof(LPETypeData)/sizeof(*LPETypeData));
 
@@ -290,12 +292,16 @@ Effect::New(EffectType lpenr, LivePathEffectObject *lpeobj)
             break;
         case TAPER_STROKE:
             neweffect = static_cast<Effect*> ( new LPETaperStroke(lpeobj) );
+            break;
         case SIMPLIFY:
             neweffect = static_cast<Effect*> ( new LPESimplify(lpeobj) );
             break;
         case LATTICE2:
             neweffect = static_cast<Effect*> ( new LPELattice2(lpeobj) );
             break;
+        case ENVELOPE_PERSPECTIVE:
+            neweffect = static_cast<Effect*> ( new LPEEnvelopePerspective(lpeobj) );
+            break;
         default:
             g_warning("LivePathEffect::Effect::New called with invalid patheffect type (%d)", lpenr);
             neweffect = NULL;
diff --git a/src/live_effects/lpe-envelope-perspective.cpp b/src/live_effects/lpe-envelope-perspective.cpp
new file mode 100644
index 000000000..bfd6e56d7
--- /dev/null
+++ b/src/live_effects/lpe-envelope-perspective.cpp
@@ -0,0 +1,414 @@
+/** \file
+ * LPE <envelope-perspective> implementation
+ 
+ */
+/*
+ * Authors:
+ *   Jabiertxof Code migration from python extensions envelope and perspective
+ *   Aaron Spike, aaron@ekips.org from envelope and perspective phyton code
+ *   Dmitry Platonov, shadowjack@mail.ru, 2006 perspective approach & math
+ *   Jose Hevia (freon) Transform algorithm from envelope
+ *   
+ * Copyright (C) 2007-2014 Authors 
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include "live_effects/lpe-envelope-perspective.h"
+#include "helper/geom.h"
+#include "display/curve.h"
+#include "svg/svg.h"
+#include <gtkmm/separator.h>
+#include <gtkmm/stock.h>
+#include <tools-switch.h>
+#include <gsl/gsl_linalg.h>
+#include "desktop.h"
+
+using namespace Geom;
+
+namespace Inkscape {
+namespace LivePathEffect {
+
+LPEEnvelopePerspective::LPEEnvelopePerspective(LivePathEffectObject *lpeobject) :
+    Effect(lpeobject),
+    // initialise your parameters here:
+    perspective(_("Perspective"), _("Perspective"), "Perspective", &wr, this, false),
+    Up_Left_Point(_("Top Left:"), _("Top Left - Ctrl+Alt+Click to reset"), "Up_Left_Point", &wr, this),
+    Up_Right_Point(_("Top Right:"), _("Top Right - Ctrl+Alt+Click to reset"), "Up_Right_Point", &wr, this),
+    Down_Left_Point(_("Down Left:"), _("Down Left - Ctrl+Alt+Click to reset"), "Down_Left_Point", &wr, this),
+    Down_Right_Point(_("Down Right:"), _("Down Right - Ctrl+Alt+Click to reset"), "Down_Right_Point", &wr, this)
+{
+    // register all your parameters here, so Inkscape knows which parameters this effect has:
+    registerParameter( dynamic_cast<Parameter *>(&perspective));
+    registerParameter( dynamic_cast<Parameter *>(&Up_Left_Point) );
+    registerParameter( dynamic_cast<Parameter *>(&Up_Right_Point) );
+    registerParameter( dynamic_cast<Parameter *>(&Down_Left_Point) );
+    registerParameter( dynamic_cast<Parameter *>(&Down_Right_Point) );
+}
+
+LPEEnvelopePerspective::~LPEEnvelopePerspective()
+{
+}
+
+void LPEEnvelopePerspective::doEffect(SPCurve *curve) {
+    using Geom::X;
+    using Geom::Y;
+    double projmatrix[3][3];
+    if(perspective){
+        std::vector<Geom::Point> handles(4);
+        handles[0] = Down_Left_Point;
+        handles[1] = Up_Left_Point;
+        handles[2] = Up_Right_Point;
+        handles[3] = Down_Right_Point;
+        std::vector<Geom::Point> sourceHandles(4);
+        sourceHandles[0] = Geom::Point(boundingbox_X.min(), boundingbox_Y.max());
+        sourceHandles[1] = Geom::Point(boundingbox_X.min(), boundingbox_Y.min());
+        sourceHandles[2] = Geom::Point(boundingbox_X.max(), boundingbox_Y.min());
+        sourceHandles[3] = Geom::Point(boundingbox_X.max(), boundingbox_Y.max());
+        double solmatrix[8][8] = {{0}};
+        double free_term[8] = {0};
+        double gslSolmatrix[64];
+        for(unsigned int i = 0; i < 4; ++i){
+            solmatrix[i][0] = sourceHandles[i][X];
+            solmatrix[i][1] = sourceHandles[i][Y];
+            solmatrix[i][2] = 1;
+            solmatrix[i][6] = -handles[i][X] * sourceHandles[i][X];
+            solmatrix[i][7] = -handles[i][X] * sourceHandles[i][Y];
+            solmatrix[i+4][3] = sourceHandles[i][X];
+            solmatrix[i+4][4] = sourceHandles[i][Y];
+            solmatrix[i+4][5] = 1;
+            solmatrix[i+4][6] = -handles[i][Y] * sourceHandles[i][X];
+            solmatrix[i+4][7] = -handles[i][Y] * sourceHandles[i][Y];
+            free_term[i] = handles[i][X];
+            free_term[i+4] = handles[i][Y];
+        }
+        int h = 0;
+        for( int i = 0; i < 8; i++ ) {
+            for( int j = 0; j < 8; j++ ) {
+                gslSolmatrix[h] = solmatrix[i][j];
+                h++;
+            }
+        }
+        //this is get by this page:
+        //http://www.gnu.org/software/gsl/manual/html_node/Linear-Algebra-Examples.html#Linear-Algebra-Examples
+        gsl_matrix_view m = gsl_matrix_view_array (gslSolmatrix, 8, 8);
+        gsl_vector_view b = gsl_vector_view_array (free_term, 8);
+        gsl_vector *x = gsl_vector_alloc (8);
+        int s;
+        gsl_permutation * p = gsl_permutation_alloc (8);
+        gsl_linalg_LU_decomp (&m.matrix, p, &s);
+        gsl_linalg_LU_solve (&m.matrix, p, &b.vector, x);
+        h = 0;
+        for( int i = 0; i < 3; i++ ) {
+            for( int j = 0; j < 3; j++ ) {
+                if(h==8){
+                    projmatrix[2][2] = 1.0;
+                    continue;
+                }
+                projmatrix[i][j] = gsl_vector_get(x, h);
+                h++;
+            }
+        }
+        gsl_permutation_free (p);
+        gsl_vector_free (x);
+    }
+    Geom::PathVector const original_pathv = pathv_to_linear_and_cubic_beziers(curve->get_pathvector());
+    curve->reset();
+    Geom::CubicBezier const *cubic = NULL;
+    Geom::Point pointAt1(0, 0);
+    Geom::Point pointAt2(0, 0);
+    Geom::Point pointAt3(0, 0);
+    for (Geom::PathVector::const_iterator path_it = original_pathv.begin(); path_it != original_pathv.end(); ++path_it) {
+        //Si está vacío...
+        if (path_it->empty())
+          continue;
+        //Itreadores
+        SPCurve *nCurve = new SPCurve();
+        Geom::Path::const_iterator curve_it1 = path_it->begin(); // incoming curve
+        Geom::Path::const_iterator curve_it2 =
+            ++(path_it->begin());                                // outgoing curve
+        Geom::Path::const_iterator curve_endit =
+            path_it->end_default(); // this determines when the loop has to stop
+        
+        if (path_it->closed()) {
+          // if the path is closed, maybe we have to stop a bit earlier because the
+          // closing line segment has zerolength.
+          const Geom::Curve &closingline =
+              path_it->back_closed(); // the closing line segment is always of type
+                                      // Geom::LineSegment.
+          if (are_near(closingline.initialPoint(), closingline.finalPoint())) {
+            // closingline.isDegenerate() did not work, because it only checks for
+            // *exact* zero length, which goes wrong for relative coordinates and
+            // rounding errors...
+            // the closing line segment has zero-length. So stop before that one!
+            curve_endit = path_it->end_open();
+          }
+        }
+        if(perspective){
+            nCurve->moveto(project_point(curve_it1->initialPoint(),projmatrix));
+        }else{
+            nCurve->moveto(project_point(curve_it1->initialPoint()));
+        }
+        while (curve_it2 != curve_endit) {
+          cubic = dynamic_cast<Geom::CubicBezier const *>(&*curve_it1);
+          if (cubic) {
+            pointAt1 = (*cubic)[1];
+            pointAt2 = (*cubic)[2];
+          } else {
+            pointAt1 = curve_it1->initialPoint();
+            pointAt2 = curve_it1->finalPoint();
+          }
+          pointAt3 = curve_it1->finalPoint();
+          if(perspective){
+            pointAt1 = project_point(pointAt1,projmatrix);
+            pointAt2 = project_point(pointAt2,projmatrix);
+            pointAt3 = project_point(pointAt3,projmatrix);
+          }else{
+            pointAt1 = project_point(pointAt1);
+            pointAt2 = project_point(pointAt2);
+            pointAt3 = project_point(pointAt3);
+          }
+          nCurve->curveto(pointAt1, pointAt2, pointAt3);
+          ++curve_it1;
+          ++curve_it2;
+        }
+        cubic = dynamic_cast<Geom::CubicBezier const *>(&*curve_it1);
+        if (cubic) {
+            pointAt1 = (*cubic)[1];
+            pointAt2 = (*cubic)[2];
+        } else {
+            pointAt1 = curve_it1->initialPoint();
+            pointAt2 = curve_it1->finalPoint();
+        }
+        pointAt3 = curve_it1->finalPoint();
+        if(perspective){
+            pointAt1 = project_point(pointAt1,projmatrix);
+            pointAt2 = project_point(pointAt2,projmatrix);
+            pointAt3 = project_point(pointAt3,projmatrix);
+        }else{
+            pointAt1 = project_point(pointAt1);
+            pointAt2 = project_point(pointAt2);
+            pointAt3 = project_point(pointAt3);
+        }
+        nCurve->curveto(pointAt1, pointAt2, pointAt3);
+        if(perspective){
+            nCurve->move_endpoints(project_point(path_it->begin()->initialPoint(),projmatrix), pointAt3);
+        }else{
+            nCurve->move_endpoints(project_point(path_it->begin()->initialPoint()), pointAt3);
+        }
+        //y cerramos la curva
+        if (path_it->closed()) {
+          nCurve->closepath_current();
+        }
+        curve->append(nCurve, false);
+        nCurve->reset();
+        delete nCurve;
+    }
+}
+
+Geom::Point 
+LPEEnvelopePerspective::project_point(Geom::Point p){
+    double width = boundingbox_X.extent();
+    double height = boundingbox_Y.extent();
+    Geom::Coord xratio = abs(Geom::Point(boundingbox_X.min(), boundingbox_Y.max())[X]-p[X])/width;
+    Geom::Coord yratio = abs(Geom::Point(boundingbox_X.min(), boundingbox_Y.max())[Y]-p[Y])/height;
+    Geom::Line* horiz = new Geom::Line();
+    Geom::Line* vert = new Geom::Line();
+    vert->setPoints (pointAtRatio(yratio,Down_Left_Point,Up_Left_Point),pointAtRatio(yratio,Down_Right_Point,Up_Right_Point));
+    horiz->setPoints (pointAtRatio(xratio,Down_Left_Point,Down_Right_Point),pointAtRatio(xratio,Up_Left_Point,Up_Right_Point));
+
+    OptCrossing crossPoint = intersection(*horiz,*vert);
+    if(crossPoint){
+        return horiz->pointAt(Geom::Coord(crossPoint->ta));
+    }else{
+        return p;
+    }
+}
+
+Geom::Point 
+LPEEnvelopePerspective::project_point(Geom::Point p, double m[][3]){
+    Geom::Coord x = p[0];
+    Geom::Coord y = p[1];
+    return Geom::Point(
+                Geom::Coord((x*m[0][0] + y*m[0][1] + m[0][2])/(x*m[2][0]+y*m[2][1]+m[2][2])),
+                Geom::Coord((x*m[1][0] + y*m[1][1] + m[1][2])/(x*m[2][0]+y*m[2][1]+m[2][2])));
+}
+
+Geom::Point
+LPEEnvelopePerspective::pointAtRatio(Geom::Coord ratio,Geom::Point A, Geom::Point B){
+        Geom::Coord x = A[X] + (ratio * (B[X]-A[X]));
+        Geom::Coord y = A[Y]+ (ratio * (B[Y]-A[Y]));
+        return Point(x, y);
+}
+
+
+Gtk::Widget *
+LPEEnvelopePerspective::newWidget()
+{
+    // use manage here, because after deletion of Effect object, others might still be pointing to this widget.
+    Gtk::VBox * vbox = Gtk::manage( new Gtk::VBox(Effect::newWidget()) );
+
+    vbox->set_border_width(5);
+    vbox->set_homogeneous(false);
+    vbox->set_spacing(6);
+    Gtk::HBox * hbox = Gtk::manage(new Gtk::HBox(false,0));
+
+    Gtk::Button* resetButton = Gtk::manage(new Gtk::Button(Gtk::Stock::CLEAR));
+    resetButton->signal_clicked().connect(sigc::mem_fun (*this,&LPEEnvelopePerspective::resetGrid));
+    resetButton->set_size_request(140,45);
+    vbox->pack_start(*hbox, true,true,2);
+    hbox->pack_start(*resetButton, false, false,2);
+    std::vector<Parameter *>::iterator it = param_vector.begin();
+    Gtk::HBox * hboxUpHandles = Gtk::manage(new Gtk::HBox(false,0));
+    Gtk::HBox * hboxDownHandles = Gtk::manage(new Gtk::HBox(false,0));
+    while (it != param_vector.end()) {
+        if ((*it)->widget_is_visible) {
+            Parameter * param = *it;
+            Gtk::Widget * widg = dynamic_cast<Gtk::Widget *>(param->param_newWidget());
+            if (param->param_key == "Up_Left_Point" ||
+                param->param_key == "Up_Right_Point" ||
+                param->param_key == "Down_Left_Point" ||
+                param->param_key == "Down_Right_Point")
+            {
+                Gtk::HBox * pointParameter = dynamic_cast<Gtk::HBox *>(widg);
+                std::vector< Gtk::Widget* > childList = pointParameter->get_children();
+                Gtk::HBox * pointParameterHBox = dynamic_cast<Gtk::HBox *>(childList[0]);
+                std::vector< Gtk::Widget* > childList2 = pointParameterHBox->get_children();
+                pointParameterHBox->remove(childList2[0][0]);
+                Glib::ustring * tip = param->param_getTooltip();
+                if (widg) {
+                    if(param->param_key == "Up_Left_Point"){
+                        Gtk::Label* handles = Gtk::manage(new Gtk::Label(Glib::ustring(_("Handles:")),Gtk::ALIGN_START));
+                        vbox->pack_start(*handles, false, false, 2);
+                        hboxUpHandles->pack_start(*widg, true, true, 2);
+                        hboxUpHandles->pack_start(*Gtk::manage(new Gtk::VSeparator()), Gtk::PACK_EXPAND_WIDGET);
+                    }else if(param->param_key == "Up_Right_Point"){
+                        hboxUpHandles->pack_start(*widg, true, true, 2);
+                    }else if(param->param_key == "Down_Left_Point"){
+                        hboxDownHandles->pack_start(*widg, true, true, 2);
+                        hboxDownHandles->pack_start(*Gtk::manage(new Gtk::VSeparator()), Gtk::PACK_EXPAND_WIDGET);
+                    }else{
+                        hboxDownHandles->pack_start(*widg, true, true, 2);
+                    }
+                    if (tip) {
+                        widg->set_tooltip_text(*tip);
+                    } else {
+                        widg->set_tooltip_text("");
+                        widg->set_has_tooltip(false);
+                    }
+                }
+            }else{
+                Glib::ustring * tip = param->param_getTooltip();
+                if (widg) {
+                    vbox->pack_start(*widg, true, true, 2);
+                    if (tip) {
+                        widg->set_tooltip_text(*tip);
+                    } else {
+                        widg->set_tooltip_text("");
+                        widg->set_has_tooltip(false);
+                    }
+                }
+            }
+        }
+
+        ++it;
+    }
+    vbox->pack_start(*hboxUpHandles,true, true, 2);
+    Gtk::HBox * hboxMiddle = Gtk::manage(new Gtk::HBox(true,2));
+    hboxMiddle->pack_start(*Gtk::manage(new Gtk::HSeparator()), Gtk::PACK_EXPAND_WIDGET);
+    hboxMiddle->pack_start(*Gtk::manage(new Gtk::HSeparator()), Gtk::PACK_EXPAND_WIDGET);
+    vbox->pack_start(*hboxMiddle, false, true, 2);
+    vbox->pack_start(*hboxDownHandles, true, true, 2);
+    return dynamic_cast<Gtk::Widget *>(vbox);
+}
+
+void
+LPEEnvelopePerspective::doBeforeEffect (SPLPEItem const* lpeitem)
+{
+    original_bbox(lpeitem);
+    setDefaults();
+}
+
+void
+LPEEnvelopePerspective::setDefaults()
+{
+    Geom::Point Up_Left(boundingbox_X.min(), boundingbox_Y.min());
+    Geom::Point Up_Right(boundingbox_X.max(), boundingbox_Y.min());
+    Geom::Point Down_Left(boundingbox_X.min(), boundingbox_Y.max());
+    Geom::Point Down_Right(boundingbox_X.max(), boundingbox_Y.max());
+
+    Up_Left_Point.param_update_default(Up_Left);
+    Up_Right_Point.param_update_default(Up_Right);
+    Down_Right_Point.param_update_default(Down_Right);
+    Down_Left_Point.param_update_default(Down_Left);
+}
+
+void
+LPEEnvelopePerspective::resetGrid()
+{
+    Up_Left_Point.param_set_and_write_default();
+    Up_Right_Point.param_set_and_write_default();
+    Down_Right_Point.param_set_and_write_default();
+    Down_Left_Point.param_set_and_write_default();
+    //todo:this hack is only to reposition the knots on reser grid button
+    //Better update path effect in LPEITEM
+    SPDesktop * desktop = inkscape_active_desktop();
+    tools_switch(desktop, TOOLS_SELECT);
+    tools_switch(desktop, TOOLS_NODES);
+}
+
+void
+LPEEnvelopePerspective::resetDefaults(SPItem const* item)
+{
+    Effect::resetDefaults(item);
+    original_bbox(SP_LPE_ITEM(item));
+    setDefaults();
+    resetGrid();
+}
+
+void
+LPEEnvelopePerspective::calculateCurve(Geom::Point a,Geom::Point b, SPCurve* c, bool horizontal, bool move)
+{
+    using Geom::X;
+    using Geom::Y;
+    if(move) c->moveto(a);
+    Geom::Point cubic1 = a + (1./3)* (b - a);
+    Geom::Point cubic2 = b + (1./3)* (a - b);
+    if(horizontal) c->curveto(Geom::Point(cubic1[X],a[Y]),Geom::Point(cubic2[X],b[Y]),b);
+    else c->curveto(Geom::Point(a[X],cubic1[Y]),Geom::Point(b[X],cubic2[Y]),b);
+}
+
+void
+LPEEnvelopePerspective::addCanvasIndicators(SPLPEItem const */*lpeitem*/, std::vector<Geom::PathVector> &hp_vec)
+{
+    hp_vec.clear();
+
+    SPCurve *c = new SPCurve();
+    c->reset();
+    c->moveto(Up_Left_Point);
+    c->lineto(Up_Right_Point);
+    c->lineto(Down_Right_Point);
+    c->lineto(Down_Left_Point);
+    c->lineto(Up_Left_Point);
+    hp_vec.push_back(c->get_pathvector());
+}
+
+
+/* ######################## */
+
+} //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 :
diff --git a/src/live_effects/lpe-envelope-perspective.h b/src/live_effects/lpe-envelope-perspective.h
new file mode 100644
index 000000000..6aae33936
--- /dev/null
+++ b/src/live_effects/lpe-envelope-perspective.h
@@ -0,0 +1,76 @@
+#ifndef INKSCAPE_LPE_ENVELOPE_PERSPECTIVE_H
+#define INKSCAPE_LPE_ENVELOPE_PERSPECTIVE_H
+
+/** \file
+ * LPE <envelope-perspective> implementation , see lpe-envelope-perspective.cpp.
+ 
+ */
+/*
+ * Authors:
+ *   Jabiertxof Code migration from python extensions envelope and perspective
+ *   Aaron Spike, aaron@ekips.org from envelope and perspective phyton code
+ *   Dmitry Platonov, shadowjack@mail.ru, 2006 perspective approach & math
+ *   Jose Hevia (freon) Transform algorithm from envelope
+ *   
+ * Copyright (C) 2007-2014 Authors 
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include "live_effects/parameter/enum.h"
+#include "live_effects/effect.h"
+#include "live_effects/parameter/pointreseteable.h"
+#include "live_effects/lpegroupbbox.h"
+
+namespace Inkscape {
+namespace LivePathEffect {
+
+class LPEEnvelopePerspective : public Effect, GroupBBoxEffect {
+public:
+
+    LPEEnvelopePerspective(LivePathEffectObject *lpeobject);
+    virtual ~LPEEnvelopePerspective();
+
+    virtual void doEffect(SPCurve *curve);
+
+    virtual Geom::Point project_point(Geom::Point p);
+
+    virtual Geom::Point project_point(Geom::Point p,  double m[][3]);
+
+    Geom::Point pointAtRatio(Geom::Coord ratio,Geom::Point A, Geom::Point B);
+
+    virtual void resetDefaults(SPItem const* item);
+
+    virtual void doBeforeEffect(SPLPEItem const* lpeitem);
+
+    virtual Gtk::Widget * newWidget();
+
+    virtual void calculateCurve(Geom::Point a,Geom::Point b, SPCurve *c, bool horizontal, bool move);
+
+    virtual void setDefaults();
+
+    virtual void resetGrid();
+
+    //virtual void original_bbox(SPLPEItem const* lpeitem, bool absolute = false);
+
+    //virtual void addCanvasIndicators(SPLPEItem const*/*lpeitem*/, std::vector<Geom::PathVector> &/*hp_vec*/);
+
+    //virtual std::vector<Geom::PathVector> getHelperPaths(SPLPEItem const* lpeitem);
+protected:
+    void addCanvasIndicators(SPLPEItem const */*lpeitem*/, std::vector<Geom::PathVector> &hp_vec);
+private:
+
+    BoolParam perspective;
+    PointReseteableParam Up_Left_Point;
+    PointReseteableParam Up_Right_Point;
+    PointReseteableParam Down_Left_Point;
+    PointReseteableParam Down_Right_Point;
+
+    LPEEnvelopePerspective(const LPEEnvelopePerspective&);
+    LPEEnvelopePerspective& operator=(const LPEEnvelopePerspective&);
+};
+
+} //namespace LivePathEffect
+} //namespace Inkscape
+
+#endif