src/live_effects/lpe-vonkoch.cpp

   1 #define INKSCAPE_LPE_VONKOCH_CPP
   2
   3 /*
   4  * Copyright (C) JF Barraud 2007 <jf.barraud@gmail.com>
   5  *
   6  * Released under GNU GPL, read the file 'COPYING' for more information
   7  */
   8
   9 #include <cstdio>
  10 #include "live_effects/lpe-vonkoch.h"
  11 #include <2geom/transforms.h>
  12
  13 //using std::vector;
  14 namespace Inkscape {
  15 namespace LivePathEffect {
  16
  17 void
  18 VonKochPathParam::param_setup_nodepath(Inkscape::NodePath::Path *np)
  19 {
  20     PathParam::param_setup_nodepath(np);
  21     //sp_nodepath_make_straight_path(np);
  22 }
  23
  24 //FIXME: a path is used here instead of 2 points to work around path/point param incompatibility bug.
  25 void
  26 VonKochRefPathParam::param_setup_nodepath(Inkscape::NodePath::Path *np)
  27 {
  28     PathParam::param_setup_nodepath(np);
  29     //sp_nodepath_make_straight_path(np);
  30 }
  31 bool
  32 VonKochRefPathParam::param_readSVGValue(const gchar * strvalue)
  33 {
  34     Geom::PathVector old = _pathvector;
  35     bool res = PathParam::param_readSVGValue(strvalue);
  36     if (res && _pathvector.size()==1 && _pathvector.front().size()==1){
  37         return true;
  38     }else{
  39         _pathvector = old;
  40         return false;
  41     }
  42 }
  43
  44 LPEVonKoch::LPEVonKoch(LivePathEffectObject *lpeobject) :
  45     Effect(lpeobject),
  46     nbgenerations(_("Nb of generations:"), _("Depth of the recursion --- keep low!!"), "nbgenerations", &wr, this, 1),
  47     generator(_("Generating path:"), _("Path whose segments define the iterated transforms"), "generator", &wr, this, "M0,0 L30,0 M0,10 L10,10 M 20,10 L30,10"),
  48     similar_only(_("Use uniform transforms only"), _("2 consecutive segments are used to reverse/preserve orientation only (otherwise, they define a general transform)."), "similar_only", &wr, this, false),
  49     drawall(_("Draw all generations"), _("If unchecked, draw only the last generation"), "drawall", &wr, this, true),
  50     //,draw_boxes(_("Display boxes"), _("Display boxes instead of paths only"), "draw_boxes", &wr, this, true)
  51     ref_path(_("Reference segment:"), _("The reference segment. Defaults to the horizontal midline of the bbox."), "ref_path", &wr, this, "M0,0 L10,0"),
  52     //refA(_("Ref Start"), _("Left side middle of the reference box"), "refA", &wr, this),
  53     //refB(_("Ref End"), _("Right side middle of the reference box"), "refB", &wr, this),
  54     //FIXME: a path is used here instead of 2 points to work around path/point param incompatibility bug.
  55     maxComplexity(_("Max complexity:"), _("Disable effect if the output is too complex"), "maxComplexity", &wr, this, 1000)
  56 {
  57     //FIXME: a path is used here instead of 2 points to work around path/point param incompatibility bug.
  58     registerParameter( dynamic_cast<Parameter *>(&ref_path) );
  59     //registerParameter( dynamic_cast<Parameter *>(&refA) );
  60     //registerParameter( dynamic_cast<Parameter *>(&refB) );
  61     registerParameter( dynamic_cast<Parameter *>(&generator) );
  62     registerParameter( dynamic_cast<Parameter *>(&similar_only) );
  63     registerParameter( dynamic_cast<Parameter *>(&nbgenerations) );
  64     registerParameter( dynamic_cast<Parameter *>(&drawall) );
  65     registerParameter( dynamic_cast<Parameter *>(&maxComplexity) );
  66     //registerParameter( dynamic_cast<Parameter *>(&draw_boxes) );
  67
  68     nbgenerations.param_make_integer();
  69     nbgenerations.param_set_range(0, NR_HUGE);
  70     maxComplexity.param_make_integer();
  71     maxComplexity.param_set_range(0, NR_HUGE);
  72 }
  73
  74 LPEVonKoch::~LPEVonKoch()
  75 {
  76
  77 }
  78
  79 std::vector<Geom::Path>
  80 LPEVonKoch::doEffect_path (std::vector<Geom::Path> const & path_in)
  81 {
  82     using namespace Geom;
  83
  84     std::vector<Geom::Path> generating_path = generator.get_pathvector();
  85
  86     if (generating_path.size()==0) {
  87         return path_in;
  88     }
  89
  90     //Collect transform matrices.
  91     Matrix m0;
  92     Geom::Path refpath = ref_path.get_pathvector().front();
  93     Point A = refpath.pointAt(0);
  94     Point B = refpath.pointAt(refpath.size());
  95     Point u = B-A;
  96     m0 = Matrix(u[X], u[Y],-u[Y], u[X], A[X], A[Y]);
  97
  98     //FIXME: a path is used as ref instead of 2 points to work around path/point param incompatibility bug.
  99     //Point u = refB-refA;
 100     //m0 = Matrix(u[X], u[Y],-u[Y], u[X], refA[X], refA[Y]);
 101     m0 = m0.inverse();
 102
 103     std::vector<Matrix> transforms;
 104     for (unsigned i=0; i<generating_path.size(); i++){
 105         Matrix m;
 106         if(generating_path[i].size()==1){
 107             Point p = generating_path[i].pointAt(0);
 108             Point u = generating_path[i].pointAt(1)-p;
 109             m = Matrix(u[X], u[Y],-u[Y], u[X], p[X], p[Y]);
 110             m = m0*m;
 111             transforms.push_back(m);
 112         }else if(generating_path[i].size()>=2){
 113             Point p = generating_path[i].pointAt(1);
 114             Point u = generating_path[i].pointAt(2)-p;
 115             Point v = p-generating_path[i].pointAt(0);
 116             if (similar_only.get_value()){
 117                 int sign = (u[X]*v[Y]-u[Y]*v[X]>=0?1:-1);
 118                 v[X] = -u[Y]*sign;
 119                 v[Y] =  u[X]*sign;
 120             }
 121             m = Matrix(u[X], u[Y],v[X], v[Y], p[X], p[Y]);
 122             m = m0*m;
 123             transforms.push_back(m);
 124         }
 125     }
 126
 127     if (transforms.size()==0){
 128         return path_in;
 129     }
 130
 131     //Do nothing if the output is too complex...
 132     int path_in_complexity = 0;
 133     for (unsigned k = 0; k < path_in.size(); k++){
 134             path_in_complexity+=path_in[k].size();
 135     }
 136     double complexity = pow(transforms.size(),nbgenerations)*path_in_complexity;
 137     if (drawall.get_value()){
 138         int k = transforms.size();
 139         if(k>1){
 140             complexity = (pow(k,nbgenerations+1)-1)/(k-1)*path_in_complexity;
 141         }else{
 142             complexity = nbgenerations*k*path_in_complexity;
 143         }
 144     }else{
 145         complexity = pow(transforms.size(),nbgenerations)*path_in_complexity;
 146     }
 147     if (complexity > double(maxComplexity)){
 148         g_warning("VonKoch lpe's output too complex. Effect bypassed.");
 149         return path_in;
 150     }
 151
 152     //Generate path:
 153     std::vector<Geom::Path> pathi = path_in;
 154     std::vector<Geom::Path> path_out = path_in;
 155
 156     for (unsigned i = 0; i<nbgenerations; i++){
 157         if (drawall.get_value()){
 158             path_out =  path_in;
 159             complexity = path_in_complexity;
 160         }else{
 161             path_out = std::vector<Geom::Path>();
 162             complexity = 0;
 163         }
 164         for (unsigned j = 0; j<transforms.size(); j++){
 165             for (unsigned k = 0; k<pathi.size() && complexity < maxComplexity; k++){
 166                 path_out.push_back(pathi[k]*transforms[j]);
 167                 complexity+=pathi[k].size();
 168             }
 169         }
 170         pathi = path_out;
 171     }
 172     return path_out;
 173 }
 174
 175
 176 //Usefull??
 177 //void
 178 //LPEVonKoch::addCanvasIndicators(SPLPEItem */*lpeitem*/, std::vector<Geom::PathVector> &hp_vec)
 179 /*{
 180     using namespace Geom;
 181     if (draw_boxes.get_value()){
 182         double ratio = .5;
 183         if (similar_only.get_value()) ratio = boundingbox_Y.extent()/boundingbox_X.extent()/2;
 184
 185         Point BB1,BB2,BB3,BB4,v;
 186
 187         //Draw the reference box  (ref_path is supposed to consist in one line segment)
 188         //FIXME: a path is used as ref instead of 2 points to work around path/point param incompatibility bug.
 189         Geom::Path refpath = ref_path.get_pathvector().front();
 190         if (refpath.size()==1){
 191             BB1 = BB4 = refpath.front().pointAt(0);
 192             BB2 = BB3 = refpath.front().pointAt(1);
 193             v = rot90(BB2 - BB1)*ratio;
 194             BB1 -= v;
 195             BB2 -= v;
 196             BB3 += v;
 197             BB4 += v;
 198             Geom::Path refbox(BB1);
 199             refbox.appendNew<LineSegment>(BB2);
 200             refbox.appendNew<LineSegment>(BB3);
 201             refbox.appendNew<LineSegment>(BB4);
 202             refbox.close();
 203             PathVector refbox_as_vect;
 204             refbox_as_vect.push_back(refbox);
 205             hp_vec.push_back(refbox_as_vect);
 206         }
 207         //Draw the transformed boxes
 208         std::vector<Geom::Path> generating_path = generator.get_pathvector();
 209         for (unsigned i=0;i<generating_path.size(); i++){
 210             if (generating_path[i].size()==0){
 211                 //Ooops! this should not happen.
 212             }else if (generating_path[i].size()==1){
 213                 BB1 = BB4 = generating_path[i].pointAt(0);
 214                 BB2 = BB3 = generating_path[i].pointAt(1);
 215                 v = rot90(BB2 - BB1)*ratio;
 216             }else{//Only tak the first 2 segments into account.
 217                 BB1 = BB4 = generating_path[i].pointAt(1);
 218                 BB2 = BB3 = generating_path[i].pointAt(2);
 219                 if(similar_only.get_value()){
 220                     v = rot90(BB2 - BB1)*ratio;
 221             }else{
 222                     v = (generating_path[i].pointAt(0) - BB1)*ratio;
 223                 }
 224             }
 225             BB1 -= v;
 226             BB2 -= v;
 227             BB3 += v;
 228             BB4 += v;
 229             Geom::Path path(BB1);
 230             path.appendNew<LineSegment>(BB2);
 231             path.appendNew<LineSegment>(BB3);
 232             path.appendNew<LineSegment>(BB4);
 233             path.close();
 234             PathVector pathv;
 235             pathv.push_back(path);
 236             hp_vec.push_back(pathv);
 237         }
 238     }
 239 }
 240 */
 241
 242 void
 243 LPEVonKoch::doBeforeEffect (SPLPEItem *lpeitem)
 244 {
 245     using namespace Geom;
 246     original_bbox(lpeitem);
 247
 248     std::vector<Geom::Path> paths = ref_path.get_pathvector();
 249     Geom::Point A,B;
 250     if (paths.size()==0||paths.front().size()==0){
 251         //FIXME: a path is used as ref instead of 2 points to work around path/point param incompatibility bug.
 252         //refA.param_setValue( Geom::Point(boundingbox_X.min(), boundingbox_Y.middle()) );
 253         //refB.param_setValue( Geom::Point(boundingbox_X.max(), boundingbox_Y.middle()) );
 254         A = Point(boundingbox_X.min(), boundingbox_Y.middle());
 255         B = Point(boundingbox_X.max(), boundingbox_Y.middle());
 256     }else{
 257         A = paths.front().pointAt(0);
 258         B = paths.front().pointAt(paths.front().size());
 259     }
 260     if (paths.size()!=1||paths.front().size()!=1){
 261         Geom::Path tmp_path(A);
 262         tmp_path.appendNew<LineSegment>(B);
 263         std::vector<Geom::Path> tmp_pathv;
 264         tmp_pathv.push_back(tmp_path);
 265         ref_path.set_new_value(tmp_pathv,true);
 266     }
 267 }
 268
 269
 270 void
 271 LPEVonKoch::resetDefaults(SPItem * item)
 272 {
 273     Effect::resetDefaults(item);
 274
 275     using namespace Geom;
 276     original_bbox(SP_LPE_ITEM(item));
 277
 278     Point A,B;
 279     A[Geom::X] = boundingbox_X.min();
 280     A[Geom::Y] = boundingbox_Y.middle();
 281     B[Geom::X] = boundingbox_X.max();
 282     B[Geom::Y] = boundingbox_Y.middle();
 283
 284     std::vector<Geom::Path> paths,refpaths;
 285     Geom::Path path = Geom::Path(A);
 286     path.appendNew<Geom::LineSegment>(B);
 287
 288     refpaths.push_back(path);
 289     ref_path.set_new_value(refpaths, true);
 290
 291     paths.push_back(path * Matrix(1./3,0,0,1./3, A[X]*2./3, A[Y]*2./3 + boundingbox_Y.extent()/2));
 292     paths.push_back(path * Matrix(1./3,0,0,1./3, B[X]*2./3, B[Y]*2./3 + boundingbox_Y.extent()/2));
 293     generator.set_new_value(paths, true);
 294
 295     //FIXME: a path is used as ref instead of 2 points to work around path/point param incompatibility bug.
 296     //refA[Geom::X] = boundingbox_X.min();
 297     //refA[Geom::Y] = boundingbox_Y.middle();
 298     //refB[Geom::X] = boundingbox_X.max();
 299     //refB[Geom::Y] = boundingbox_Y.middle();
 300     //std::vector<Geom::Path> paths;
 301     //Geom::Path path = Geom::Path( (Point) refA);
 302     //path.appendNew<Geom::LineSegment>( (Point) refB );
 303     //paths.push_back(path * Matrix(1./3,0,0,1./3, refA[X]*2./3, refA[Y]*2./3 + boundingbox_Y.extent()/2));
 304     //paths.push_back(path * Matrix(1./3,0,0,1./3, refB[X]*2./3, refB[Y]*2./3 + boundingbox_Y.extent()/2));
 305     //paths.push_back(path);
 306     //generator.set_new_value(paths, true);
 307 }
 308
 309 } // namespace LivePathEffect
 310 } /* namespace Inkscape */
 311
 312 /*
 313   Local Variables:
 314   mode:c++
 315   c-file-style:"stroustrup"
 316   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 317   indent-tabs-mode:nil
 318   fill-column:99
 319   End:
 320 */
 321 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :