synfig-core/trunk/src/modules/mod_particle/plant.cpp

   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file plant.cpp
   3 **      \brief Template
   4 **
   5 **      $Id$
   6 **
   7 **      \legal
   8 **      Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
   9 **      Copyright (c) 2007 Chris Moore
  10 **
  11 **      This package is free software; you can redistribute it and/or
  12 **      modify it under the terms of the GNU General Public License as
  13 **      published by the Free Software Foundation; either version 2 of
  14 **      the License, or (at your option) any later version.
  15 **
  16 **      This package is distributed in the hope that it will be useful,
  17 **      but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 **      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19 **      General Public License for more details.
  20 **      \endlegal
  21 */
  22 /* ========================================================================= */
  23
  24 /* === H E A D E R S ======================================================= */
  25
  26 #ifdef USING_PCH
  27 #       include "pch.h"
  28 #else
  29 #ifdef HAVE_CONFIG_H
  30 #       include <config.h>
  31 #endif
  32
  33 #include <synfig/angle.h>
  34 #include "plant.h"
  35 #include <synfig/string.h>
  36 #include <synfig/time.h>
  37 #include <synfig/context.h>
  38 #include <synfig/paramdesc.h>
  39 #include <synfig/renddesc.h>
  40 #include <synfig/surface.h>
  41 #include <synfig/value.h>
  42 #include <synfig/valuenode.h>
  43
  44 #include <ETL/calculus>
  45 #include <ETL/bezier>
  46 #include <ETL/hermite>
  47 #include <vector>
  48
  49 #include <synfig/valuenode_bline.h>
  50
  51 #endif
  52
  53 using namespace etl;
  54
  55 /* === M A C R O S ========================================================= */
  56
  57 #define SAMPLES         300
  58 #define ROUND_END_FACTOR        (4)
  59 #define CUSP_THRESHOLD          (0.15)
  60 #define NO_LOOP_COOKIE          synfig::Vector(84951305,7836658)
  61 #define EPSILON                         (0.000000001)
  62 #define CUSP_TANGENT_ADJUST     (0.025)
  63
  64 /* === G L O B A L S ======================================================= */
  65
  66 SYNFIG_LAYER_INIT(Plant);
  67 SYNFIG_LAYER_SET_NAME(Plant,"plant");
  68 SYNFIG_LAYER_SET_LOCAL_NAME(Plant,N_("Plant"));
  69 SYNFIG_LAYER_SET_CATEGORY(Plant,N_("Other"));
  70 SYNFIG_LAYER_SET_VERSION(Plant,"0.1");
  71 SYNFIG_LAYER_SET_CVS_ID(Plant,"$Id$");
  72
  73 /* === P R O C E D U R E S ================================================= */
  74
  75 /* === M E T H O D S ======================================================= */
  76
  77
  78 Plant::Plant():
  79         split_angle(Angle::deg(10)),
  80         gravity(0,-0.1),
  81         velocity(0.3),
  82         perp_velocity(0.0),
  83         step(0.01),
  84         sprouts(10)
  85 {
  86         bounding_rect=Rect::zero();
  87         random_factor=0.2;
  88         random.set_seed(time(NULL));
  89
  90         bline.push_back(BLinePoint());
  91         bline.push_back(BLinePoint());
  92         bline.push_back(BLinePoint());
  93         bline[0].set_vertex(Point(0,1));
  94         bline[1].set_vertex(Point(0,-1));
  95         bline[2].set_vertex(Point(1,0));
  96         bline[0].set_tangent(bline[1].get_vertex()-bline[2].get_vertex()*0.5f);
  97         bline[1].set_tangent(bline[2].get_vertex()-bline[0].get_vertex()*0.5f);
  98         bline[2].set_tangent(bline[0].get_vertex()-bline[1].get_vertex()*0.5f);
  99         bline[0].set_width(1.0f);
 100         bline[1].set_width(1.0f);
 101         bline[2].set_width(1.0f);
 102         bline_loop=true;
 103         mass=(0.5);
 104         splits=5;
 105         drag=0.1;
 106         size=0.015;
 107         needs_sync_=true;
 108         sync();
 109         size_as_alpha=false;
 110         reverse=true;
 111 }
 112
 113 void
 114 Plant::branch(int n,int depth,float t, float stunt_growth, synfig::Point position,synfig::Vector vel)const
 115 {
 116         float next_split((1.0-t)/(splits-depth)+t/*+random_factor*random(40+depth,t*splits,0,0)/splits*/);
 117         for(;t<next_split;t+=step)
 118         {
 119                 vel[0]+=gravity[0]*step;
 120                 vel[1]+=gravity[1]*step;
 121                 vel*=(1.0-(drag)*step);
 122                 position[0]+=vel[0]*step;
 123                 position[1]+=vel[1]*step;
 124
 125                 particle_list.push_back(Particle(position, gradient(t)));
 126                 if (particle_list.size() % 1000000 == 0)
 127                         synfig::info("constructed %d million particles...", particle_list.size()/1000000);
 128
 129                 bounding_rect.expand(position);
 130         }
 131
 132         if(t>=1.0-stunt_growth)return;
 133
 134         synfig::Real sin_v=synfig::Angle::cos(split_angle).get();
 135         synfig::Real cos_v=synfig::Angle::sin(split_angle).get();
 136
 137         synfig::Vector velocity1(vel[0]*sin_v - vel[1]*cos_v + random_factor*random(Random::SMOOTH_COSINE, 30+n+depth, t*splits, 0.0f, 0.0f),
 138                                                          vel[0]*cos_v + vel[1]*sin_v + random_factor*random(Random::SMOOTH_COSINE, 32+n+depth, t*splits, 0.0f, 0.0f));
 139         synfig::Vector velocity2(vel[0]*sin_v + vel[1]*cos_v + random_factor*random(Random::SMOOTH_COSINE, 31+n+depth, t*splits, 0.0f, 0.0f),
 140                                                         -vel[0]*cos_v + vel[1]*sin_v + random_factor*random(Random::SMOOTH_COSINE, 33+n+depth, t*splits, 0.0f, 0.0f));
 141
 142         Plant::branch(n,depth+1,t,stunt_growth,position,velocity1);
 143         Plant::branch(n,depth+1,t,stunt_growth,position,velocity2);
 144 }
 145
 146 void
 147 Plant::calc_bounding_rect()const
 148 {
 149         std::vector<synfig::BLinePoint>::const_iterator iter,next;
 150
 151         bounding_rect=Rect::zero();
 152
 153         // Bline must have at least 2 points in it
 154         if(bline.size()<2)
 155                 return;
 156
 157         next=bline.begin();
 158
 159         if(bline_loop)
 160                 iter=--bline.end();
 161         else
 162                 iter=next++;
 163
 164         for(;next!=bline.end();iter=next++)
 165         {
 166                 bounding_rect.expand(iter->get_vertex());
 167                 bounding_rect.expand(next->get_vertex());
 168                 bounding_rect.expand(iter->get_vertex()+iter->get_tangent2()*0.3333333333333);
 169                 bounding_rect.expand(next->get_vertex()-next->get_tangent1()*0.3333333333333);
 170                 bounding_rect.expand(next->get_vertex()+next->get_tangent2()*velocity);
 171         }
 172         bounding_rect.expand_x(gravity[0]);
 173         bounding_rect.expand_y(gravity[1]);
 174         bounding_rect.expand_x(size);
 175         bounding_rect.expand_y(size);
 176 }
 177
 178 void
 179 Plant::sync()const
 180 {
 181         Mutex::Lock lock(mutex);
 182         if (!needs_sync_) return;
 183         time_t start_time; time(&start_time);
 184         particle_list.clear();
 185
 186         bounding_rect=Rect::zero();
 187
 188         // Bline must have at least 2 points in it
 189         if(bline.size()<2)
 190         {
 191                 needs_sync_=false;
 192                 return;
 193         }
 194
 195         std::vector<synfig::BLinePoint>::const_iterator iter,next;
 196
 197         etl::hermite<Vector> curve;
 198
 199         Real step(abs(this->step));
 200
 201         int seg(0);
 202
 203         next=bline.begin();
 204
 205         if(bline_loop)  iter=--bline.end(); // iter is the last  bline in the list; next is the first  bline in the list
 206         else                    iter=next++;            // iter is the first bline in the list; next is the second bline in the list
 207
 208         // loop through the bline; seg counts the blines as we do so; stop before iter is the last bline in the list
 209         for(;next!=bline.end();iter=next++,seg++)
 210         {
 211                 curve.p1()=iter->get_vertex();
 212                 curve.t1()=iter->get_tangent2();
 213                 curve.p2()=next->get_vertex();
 214                 curve.t2()=next->get_tangent1();
 215                 curve.sync();
 216                 etl::derivative<etl::hermite<Vector> > deriv(curve);
 217
 218                 Real f;
 219
 220                 int i=0, branch_count = 0, steps = round_to_int(1.0/step);
 221                 if (steps < 1) steps = 1;
 222                 for(f=0.0;f<1.0;f+=step,i++)
 223                 {
 224                         Point point(curve(f));
 225
 226                         particle_list.push_back(Particle(point, gradient(0)));
 227                         if (particle_list.size() % 1000000 == 0)
 228                                 synfig::info("constructed %d million particles...", particle_list.size()/1000000);
 229
 230                         bounding_rect.expand(point);
 231
 232                         Real stunt_growth(random_factor * (random(Random::SMOOTH_COSINE,i,f+seg,0.0f,0.0f)/2.0+0.5));
 233                         stunt_growth*=stunt_growth;
 234
 235                         if((((i+1)*sprouts + steps/2) / steps) > branch_count) {
 236                                 Vector branch_velocity(deriv(f).norm()*velocity + deriv(f).perp().norm()*perp_velocity);
 237
 238                                 branch_velocity[0] += random_factor * random(Random::SMOOTH_COSINE, 1, f*splits, 0.0f, 0.0f);
 239                                 branch_velocity[1] += random_factor * random(Random::SMOOTH_COSINE, 2, f*splits, 0.0f, 0.0f);
 240
 241                                 branch_count++;
 242                                 branch(i, 0, 0,          // time
 243                                            stunt_growth, // stunt growth
 244                                            point, branch_velocity);
 245                         }
 246                 }
 247         }
 248
 249         time_t end_time; time(&end_time);
 250         if (end_time-start_time > 4)
 251                 synfig::info("Plant::sync() constructed %d particles in %d seconds\n",
 252                                          particle_list.size(), int(end_time-start_time));
 253         needs_sync_=false;
 254 }
 255
 256 bool
 257 Plant::set_param(const String & param, const ValueBase &value)
 258 {
 259         if(param=="bline" && value.get_type()==ValueBase::TYPE_LIST)
 260         {
 261                 bline=value;
 262                 bline_loop=value.get_loop();
 263                 needs_sync_=true;
 264
 265                 return true;
 266         }
 267         if(param=="seed" && value.same_type_as(int()))
 268         {
 269                 random.set_seed(value.get(int()));
 270                 needs_sync_=true;
 271                 return true;
 272         }
 273         IMPORT_PLUS(split_angle,needs_sync_=true);
 274         IMPORT_PLUS(gravity,needs_sync_=true);
 275         IMPORT_PLUS(gradient,needs_sync_=true);
 276         IMPORT_PLUS(velocity,needs_sync_=true);
 277         IMPORT_PLUS(perp_velocity,needs_sync_=true);
 278         IMPORT_PLUS(step,{
 279                         needs_sync_ = true;
 280                         if (step <= 0)
 281                                 step=0.01; // user is probably clueless - give a good default
 282                         else if (step < 0.00001)
 283                                 step=0.00001; // 100K should be enough for anyone
 284                         else if (step > 1)
 285                                 step=1;
 286                 });
 287         IMPORT_PLUS(splits,{
 288                         needs_sync_=true;
 289                         if (splits < 1)
 290                                 splits = 1;
 291                 });
 292         IMPORT_PLUS(sprouts,needs_sync_=true);
 293         IMPORT_PLUS(random_factor,needs_sync_=true);
 294         IMPORT_PLUS(drag,needs_sync_=true);
 295         IMPORT(size);
 296         IMPORT(size_as_alpha);
 297         IMPORT(reverse);
 298
 299         return Layer_Composite::set_param(param,value);
 300 }
 301 /*
 302 void
 303 Plant::set_time(Context context, Time time)const
 304 {
 305         if(needs_sync==true)
 306         {
 307                 sync();
 308                 needs_sync_=false;
 309         }
 310         //const_cast<Plant*>(this)->sync();
 311         context.set_time(time);
 312 }
 313
 314 void
 315 Plant::set_time(Context context, Time time, Vector pos)const
 316 {
 317         if(needs_sync==true)
 318         {
 319                 sync();
 320                 needs_sync_=false;
 321         }
 322         //const_cast<Plant*>(this)->sync();
 323         context.set_time(time,pos);
 324 }
 325 */
 326 ValueBase
 327 Plant::get_param(const String& param)const
 328 {
 329         if(param=="seed")
 330                 return random.get_seed();
 331         EXPORT(bline);
 332         EXPORT(split_angle);
 333         EXPORT(gravity);
 334         EXPORT(velocity);
 335         EXPORT(perp_velocity);
 336         EXPORT(step);
 337         EXPORT(gradient);
 338         EXPORT(splits);
 339         EXPORT(sprouts);
 340         EXPORT(random_factor);
 341         EXPORT(drag);
 342         EXPORT(size);
 343
 344         EXPORT(size_as_alpha);
 345         EXPORT(reverse);
 346
 347         EXPORT_NAME();
 348         EXPORT_VERSION();
 349
 350         return Layer_Composite::get_param(param);
 351 }
 352
 353 Layer::Vocab
 354 Plant::get_param_vocab()const
 355 {
 356         Layer::Vocab ret(Layer_Composite::get_param_vocab());
 357
 358         ret.push_back(ParamDesc("bline")
 359                 .set_local_name(_("Vertices"))
 360                 .set_description(_("A list of BLine Points"))
 361                 //.set_origin("offset")
 362                 //.set_scalar("width")
 363         );
 364
 365         ret.push_back(ParamDesc("gradient")
 366                 .set_local_name(_("Gradient"))
 367                 .set_description(_("Gradient to be used for coloring the plant"))
 368         );
 369
 370         ret.push_back(ParamDesc("split_angle")
 371                 .set_local_name(_("Split Angle"))
 372                 .set_description(_("Angle by which each split deviates from its parent"))
 373         );
 374
 375         ret.push_back(ParamDesc("gravity")
 376                 .set_local_name(_("Gravity"))
 377                 .set_description(_("Direction in which the shoots tend to face"))
 378                 .set_is_distance()
 379         );
 380
 381         ret.push_back(ParamDesc("velocity")
 382                 .set_local_name(_("Tangential Velocity"))
 383                 .set_description(_("Amount to which shoots tend to grow along the tangent to the BLine"))
 384         );
 385
 386         ret.push_back(ParamDesc("perp_velocity")
 387                 .set_local_name(_("Perpendicular Velocity"))
 388                 .set_description(_("Amount to which shoots tend to grow perpendicular to the tangent to the BLine"))
 389         );
 390
 391         ret.push_back(ParamDesc("size")
 392                 .set_local_name(_("Stem Size"))
 393                 .set_description(_("Size of the stem"))
 394                 .set_is_distance()
 395         );
 396
 397         ret.push_back(ParamDesc("size_as_alpha")
 398                 .set_local_name(_("Size As Alpha"))
 399                 .set_description(_("If enabled, the alpha channel from the gradient is multiplied by the stem size, and an alpha of 1.0 is used when rendering"))
 400         );
 401
 402         ret.push_back(ParamDesc("reverse")
 403                 .set_local_name(_("Reverse"))
 404                 .set_description(_("If enabled, render the plant in the opposite direction"))
 405         );
 406
 407         ret.push_back(ParamDesc("step")
 408                 .set_local_name(_("Step"))
 409                 .set_description(_("Measure of the distance between points when rendering"))
 410         );
 411
 412         ret.push_back(ParamDesc("seed")
 413                 .set_local_name(_("Seed"))
 414                 .set_description(_("Used to seed the pseudo-random number generator"))
 415         );
 416
 417         ret.push_back(ParamDesc("splits")
 418                 .set_local_name(_("Splits"))
 419                 .set_description(_("Maximum number of times that each sprout can sprout recursively"))
 420         );
 421
 422         ret.push_back(ParamDesc("sprouts")
 423                 .set_local_name(_("Sprouts"))
 424                 .set_description(_("Number of places that growth occurs on each bline section"))
 425         );
 426
 427         ret.push_back(ParamDesc("random_factor")
 428                 .set_local_name(_("Random Factor"))
 429                 .set_description(_("Used to scale down all random effects.  Set to zero to disable randomness"))
 430         );
 431
 432         ret.push_back(ParamDesc("drag")
 433                 .set_local_name(_("Drag"))
 434                 .set_description(_("Drag slows the growth"))
 435         );
 436
 437         return ret;
 438 }
 439
 440 bool
 441 Plant::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
 442 {
 443         bool ret(context.accelerated_render(surface,quality,renddesc,cb));
 444         if(is_disabled() || !ret)
 445                 return ret;
 446
 447         Surface dest_surface;
 448         dest_surface.set_wh(surface->get_w(),surface->get_h());
 449         dest_surface.clear();
 450
 451         const Point     tl(renddesc.get_tl());
 452         const Point br(renddesc.get_br());
 453
 454         const int       w(renddesc.get_w());
 455         const int       h(renddesc.get_h());
 456
 457         const int       surface_width(surface->get_w());
 458         const int       surface_height(surface->get_h());
 459
 460         // Width and Height of a pixel
 461         const Real pw = (br[0] - tl[0]) / w;
 462         const Real ph = (br[1] - tl[1]) / h;
 463
 464         if (isinf(pw) || isinf(ph))
 465                 return true;
 466
 467         if(needs_sync_==true)
 468                 sync();
 469
 470         if (particle_list.begin() != particle_list.end())
 471         {
 472                 std::vector<Particle>::iterator iter;
 473                 Particle *particle;
 474
 475                 float radius(size*sqrt(1.0f/(abs(pw)*abs(ph))));
 476
 477                 int x1,y1,x2,y2;
 478
 479                 if (reverse)    iter = particle_list.end();
 480                 else                    iter = particle_list.begin();
 481
 482                 while (true)
 483                 {
 484                         if (reverse)    particle = &(*(iter-1));
 485                         else                    particle = &(*iter);
 486
 487                         float scaled_radius(radius);
 488                         Color color(particle->color);
 489                         if(size_as_alpha)
 490                         {
 491                                 scaled_radius*=color.get_a();
 492                                 color.set_a(1);
 493                         }
 494
 495                         // previously, radius was multiplied by sqrt(step)*12 only if
 496                         // the radius came out at less than 1 (pixel):
 497                         //   if (radius<=1.0f) radius*=sqrt(step)*12.0f;
 498                         // seems a little arbitrary - does it help?
 499
 500                         // calculate the box that this particle will be drawn as
 501                         float x1f=(particle->point[0]-tl[0])/pw-(scaled_radius*0.5);
 502                         float x2f=(particle->point[0]-tl[0])/pw+(scaled_radius*0.5);
 503                         float y1f=(particle->point[1]-tl[1])/ph-(scaled_radius*0.5);
 504                         float y2f=(particle->point[1]-tl[1])/ph+(scaled_radius*0.5);
 505                         x1=ceil_to_int(x1f);
 506                         x2=ceil_to_int(x2f)-1;
 507                         y1=ceil_to_int(y1f);
 508                         y2=ceil_to_int(y2f)-1;
 509
 510                         // if the box isn't entirely off the canvas, draw it
 511                         if(x1<=surface_width && y1<=surface_height && x2>=0 && y2>=0)
 512                         {
 513                                 float x1e=x1-x1f, x2e=x2f-x2, y1e=y1-y1f, y2e=y2f-y2;
 514                                 // printf("x1e %.4f x2e %.4f y1e %.4f y2e %.4f\n", x1e, x2e, y1e, y2e);
 515
 516                                 // adjust the box so it's entirely on the canvas
 517                                 if(x1<=0) { x1=0; x1e=0; }
 518                                 if(y1<=0) { y1=0; y1e=0; }
 519                                 if(x2>=surface_width)  { x2=surface_width;  x2e=0; }
 520                                 if(y2>=surface_height) { y2=surface_height; y2e=0; }
 521
 522                                 int w(x2-x1), h(y2-y1);
 523
 524                                 Surface::alpha_pen surface_pen(dest_surface.get_pen(x1,y1),1.0f);
 525                                 if(w>0 && h>0)
 526                                         dest_surface.fill(color,surface_pen,w,h);
 527
 528                                 /* the rectangle doesn't cross any vertical pixel boundaries so we don't
 529                                  * need to draw any top or bottom edges
 530                                  */
 531                                 if(x2<x1)
 532                                 {
 533                                         // case 1 - a single pixel
 534                                         if(y2<y1)
 535                                         {
 536                                                 surface_pen.move_to(x2,y2);
 537                                                 surface_pen.set_alpha((x2f-x1f)*(y2f-y1f));
 538                                                 surface_pen.put_value(color);
 539                                         }
 540                                         // case 2 - a single vertical column of pixels
 541                                         else
 542                                         {
 543                                                 surface_pen.move_to(x2,y1-1);
 544                                                 if (y1e!=0)     // maybe draw top pixel
 545                                                 {
 546                                                         surface_pen.set_alpha(y1e*(x2f-x1f));
 547                                                         surface_pen.put_value(color);
 548                                                 }
 549                                                 surface_pen.inc_y();
 550                                                 surface_pen.set_alpha(x2f-x1f);
 551                                                 for(int i=y1; i<y2; i++) // maybe draw pixels between
 552                                                 {
 553                                                         surface_pen.put_value(color);
 554                                                         surface_pen.inc_y();
 555                                                 }
 556                                                 if (y2e!=0)     // maybe draw bottom pixel
 557                                                 {
 558                                                         surface_pen.set_alpha(y2e*(x2f-x1f));
 559                                                         surface_pen.put_value(color);
 560                                                 }
 561                                         }
 562                                 }
 563                                 else
 564                                 {
 565                                         // case 3 - a single horizontal row of pixels
 566                                         if(y2<y1)
 567                                         {
 568                                                 surface_pen.move_to(x1-1,y2);
 569                                                 if (x1e!=0)     // maybe draw left pixel
 570                                                 {
 571                                                         surface_pen.set_alpha(x1e*(y2f-y1f));
 572                                                         surface_pen.put_value(color);
 573                                                 }
 574                                                 surface_pen.inc_x();
 575                                                 surface_pen.set_alpha(y2f-y1f);
 576                                                 for(int i=x1; i<x2; i++) // maybe draw pixels between
 577                                                 {
 578                                                         surface_pen.put_value(color);
 579                                                         surface_pen.inc_x();
 580                                                 }
 581                                                 if (x2e!=0)     // maybe draw right pixel
 582                                                 {
 583                                                         surface_pen.set_alpha(x2e*(y2f-y1f));
 584                                                         surface_pen.put_value(color);
 585                                                 }
 586                                         }
 587                                         // case 4 - a proper block of pixels
 588                                         else
 589                                         {
 590                                                 if (x1e!=0)     // maybe draw left edge
 591                                                 {
 592                                                         surface_pen.move_to(x1-1,y1-1);
 593                                                         if (y1e!=0)     // maybe draw top left pixel
 594                                                         {
 595                                                                 surface_pen.set_alpha(x1e*y1e);
 596                                                                 surface_pen.put_value(color);
 597                                                         }
 598                                                         surface_pen.inc_y();
 599                                                         surface_pen.set_alpha(x1e);
 600                                                         for(int i=y1; i<y2; i++) // maybe draw pixels along the left edge
 601                                                         {
 602                                                                 surface_pen.put_value(color);
 603                                                                 surface_pen.inc_y();
 604                                                         }
 605                                                         if (y2e!=0)     // maybe draw bottom left pixel
 606                                                         {
 607                                                                 surface_pen.set_alpha(x1e*y2e);
 608                                                                 surface_pen.put_value(color);
 609                                                         }
 610                                                         surface_pen.inc_x();
 611                                                 }
 612                                                 else
 613                                                         surface_pen.move_to(x1,y2);
 614
 615                                                 if (y2e!=0)     // maybe draw bottom edge
 616                                                 {
 617                                                         surface_pen.set_alpha(y2e);
 618                                                         for(int i=x1; i<x2; i++) // maybe draw pixels along the bottom edge
 619                                                         {
 620                                                                 surface_pen.put_value(color);
 621                                                                 surface_pen.inc_x();
 622                                                         }
 623                                                         if (x2e!=0)     // maybe draw bottom right pixel
 624                                                         {
 625                                                                 surface_pen.set_alpha(x2e*y2e);
 626                                                                 surface_pen.put_value(color);
 627                                                         }
 628                                                         surface_pen.dec_y();
 629                                                 }
 630                                                 else
 631                                                         surface_pen.move_to(x2,y2-1);
 632
 633                                                 if (x2e!=0)     // maybe draw right edge
 634                                                 {
 635                                                         surface_pen.set_alpha(x2e);
 636                                                         for(int i=y1; i<y2; i++) // maybe draw pixels along the right edge
 637                                                         {
 638                                                                 surface_pen.put_value(color);
 639                                                                 surface_pen.dec_y();
 640                                                         }
 641                                                         if (y1e!=0)     // maybe draw top right pixel
 642                                                         {
 643                                                                 surface_pen.set_alpha(x2e*y1e);
 644                                                                 surface_pen.put_value(color);
 645                                                         }
 646                                                         surface_pen.dec_x();
 647                                                 }
 648                                                 else
 649                                                         surface_pen.move_to(x2-1,y1-1);
 650
 651                                                 if (y1e!=0)     // maybe draw top edge
 652                                                 {
 653                                                         surface_pen.set_alpha(y1e);
 654                                                         for(int i=x1; i<x2; i++) // maybe draw pixels along the top edge
 655                                                         {
 656                                                                 surface_pen.put_value(color);
 657                                                                 surface_pen.dec_x();
 658                                                         }
 659                                                 }
 660                                         }
 661                                 }
 662                         }
 663
 664                         if (reverse)
 665                         {
 666                                 if (--iter == particle_list.begin())
 667                                         break;
 668                         }
 669                         else
 670                         {
 671                                 if (++iter == particle_list.end())
 672                                         break;
 673                         }
 674                 }
 675         }
 676
 677         Surface::alpha_pen pen(surface->get_pen(0,0),get_amount(),get_blend_method());
 678         dest_surface.blit_to(pen);
 679
 680         return true;
 681 }
 682
 683 Rect
 684 Plant::get_bounding_rect(Context context)const
 685 {
 686         if(needs_sync_==true)
 687                 sync();
 688
 689         if(is_disabled())
 690                 return Rect::zero();
 691
 692         if(Color::is_onto(get_blend_method()))
 693                 return context.get_full_bounding_rect() & bounding_rect;
 694
 695         //if(get_blend_method()==Color::BLEND_BEHIND)
 696         //      return context.get_full_bounding_rect() | bounding_rect;
 697         return bounding_rect;
 698 }