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

   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file plant.cpp
   3 **      \brief Implementation of the "Plant" layer
   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,"0.2");
  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         version(version__),
  86         use_width(true)
  87 {
  88         bounding_rect=Rect::zero();
  89         random_factor=0.2;
  90         random.set_seed(time(NULL));
  91
  92         bline.push_back(BLinePoint());
  93         bline.push_back(BLinePoint());
  94         bline.push_back(BLinePoint());
  95         bline[0].set_vertex(Point(0,1));
  96         bline[1].set_vertex(Point(0,-1));
  97         bline[2].set_vertex(Point(1,0));
  98         bline[0].set_tangent(bline[1].get_vertex()-bline[2].get_vertex()*0.5f);
  99         bline[1].set_tangent(bline[2].get_vertex()-bline[0].get_vertex()*0.5f);
 100         bline[2].set_tangent(bline[0].get_vertex()-bline[1].get_vertex()*0.5f);
 101         bline[0].set_width(1.0f);
 102         bline[1].set_width(1.0f);
 103         bline[2].set_width(1.0f);
 104         bline_loop=true;
 105         mass=(0.5);
 106         splits=5;
 107         drag=0.1;
 108         size=0.015;
 109         needs_sync_=true;
 110         sync();
 111         size_as_alpha=false;
 112         reverse=true;
 113 }
 114
 115 void
 116 Plant::branch(int n,int depth,float t, float stunt_growth, synfig::Point position,synfig::Vector vel)const
 117 {
 118         float next_split((1.0-t)/(splits-depth)+t/*+random_factor*random(40+depth,t*splits,0,0)/splits*/);
 119         for(;t<next_split;t+=step)
 120         {
 121                 vel[0]+=gravity[0]*step;
 122                 vel[1]+=gravity[1]*step;
 123                 vel*=(1.0-(drag)*step);
 124                 position[0]+=vel[0]*step;
 125                 position[1]+=vel[1]*step;
 126
 127                 particle_list.push_back(Particle(position, gradient(t)));
 128                 if (particle_list.size() % 1000000 == 0)
 129                         synfig::info("constructed %d million particles...", particle_list.size()/1000000);
 130
 131                 bounding_rect.expand(position);
 132         }
 133
 134         if(t>=1.0-stunt_growth)return;
 135
 136         synfig::Real sin_v=synfig::Angle::cos(split_angle).get();
 137         synfig::Real cos_v=synfig::Angle::sin(split_angle).get();
 138
 139         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),
 140                                                          vel[0]*cos_v + vel[1]*sin_v + random_factor*random(Random::SMOOTH_COSINE, 32+n+depth, t*splits, 0.0f, 0.0f));
 141         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),
 142                                                         -vel[0]*cos_v + vel[1]*sin_v + random_factor*random(Random::SMOOTH_COSINE, 33+n+depth, t*splits, 0.0f, 0.0f));
 143
 144         Plant::branch(n,depth+1,t,stunt_growth,position,velocity1);
 145         Plant::branch(n,depth+1,t,stunt_growth,position,velocity2);
 146 }
 147
 148 void
 149 Plant::calc_bounding_rect()const
 150 {
 151         std::vector<synfig::BLinePoint>::const_iterator iter,next;
 152
 153         bounding_rect=Rect::zero();
 154
 155         // Bline must have at least 2 points in it
 156         if(bline.size()<2)
 157                 return;
 158
 159         next=bline.begin();
 160
 161         if(bline_loop)
 162                 iter=--bline.end();
 163         else
 164                 iter=next++;
 165
 166         for(;next!=bline.end();iter=next++)
 167         {
 168                 bounding_rect.expand(iter->get_vertex());
 169                 bounding_rect.expand(next->get_vertex());
 170                 bounding_rect.expand(iter->get_vertex()+iter->get_tangent2()*0.3333333333333);
 171                 bounding_rect.expand(next->get_vertex()-next->get_tangent1()*0.3333333333333);
 172                 bounding_rect.expand(next->get_vertex()+next->get_tangent2()*velocity);
 173         }
 174         bounding_rect.expand_x(gravity[0]);
 175         bounding_rect.expand_y(gravity[1]);
 176         bounding_rect.expand_x(size);
 177         bounding_rect.expand_y(size);
 178 }
 179
 180 void
 181 Plant::sync()const
 182 {
 183         Mutex::Lock lock(mutex);
 184         if (!needs_sync_) return;
 185         time_t start_time; time(&start_time);
 186         particle_list.clear();
 187
 188         bounding_rect=Rect::zero();
 189
 190         // Bline must have at least 2 points in it
 191         if(bline.size()<2)
 192         {
 193                 needs_sync_=false;
 194                 return;
 195         }
 196
 197         std::vector<synfig::BLinePoint>::const_iterator iter,next;
 198
 199         etl::hermite<Vector> curve;
 200
 201         Real step(abs(this->step));
 202
 203         int seg(0);
 204
 205         next=bline.begin();
 206
 207         if(bline_loop)  iter=--bline.end(); // iter is the last  bline in the list; next is the first  bline in the list
 208         else                    iter=next++;            // iter is the first bline in the list; next is the second bline in the list
 209
 210         // loop through the bline; seg counts the blines as we do so; stop before iter is the last bline in the list
 211         for(;next!=bline.end();iter=next++,seg++)
 212         {
 213                 float iterw=iter->get_width();  // the width value of the iter vertex
 214                 float nextw=next->get_width();  // the width value of the next vertex
 215                 float width;                                    // the width at an intermediate position
 216                 curve.p1()=iter->get_vertex();
 217                 curve.t1()=iter->get_tangent2();
 218                 curve.p2()=next->get_vertex();
 219                 curve.t2()=next->get_tangent1();
 220                 curve.sync();
 221                 etl::derivative<etl::hermite<Vector> > deriv(curve);
 222
 223                 Real f;
 224
 225                 int i=0, branch_count = 0, steps = round_to_int(1.0/step);
 226                 if (steps < 1) steps = 1;
 227                 for(f=0.0;f<1.0;f+=step,i++)
 228                 {
 229                         Point point(curve(f));
 230
 231                         particle_list.push_back(Particle(point, gradient(0)));
 232                         if (particle_list.size() % 1000000 == 0)
 233                                 synfig::info("constructed %d million particles...", particle_list.size()/1000000);
 234
 235                         bounding_rect.expand(point);
 236
 237                         Real stunt_growth(random_factor * (random(Random::SMOOTH_COSINE,i,f+seg,0.0f,0.0f)/2.0+0.5));
 238                         stunt_growth*=stunt_growth;
 239
 240                         if((((i+1)*sprouts + steps/2) / steps) > branch_count) {
 241                                 Vector branch_velocity(deriv(f).norm()*velocity + deriv(f).perp().norm()*perp_velocity);
 242
 243                                 branch_velocity[0] += random_factor * random(Random::SMOOTH_COSINE, 1, f*splits, 0.0f, 0.0f);
 244                                 branch_velocity[1] += random_factor * random(Random::SMOOTH_COSINE, 2, f*splits, 0.0f, 0.0f);
 245
 246                                 if (use_width)
 247                                 {
 248                                         width = iterw+(nextw-iterw)*f; // calculate the width based on the current position
 249
 250                                         branch_velocity[0] *= width; // scale the velocity accordingly to the current width
 251                                         branch_velocity[1] *= width;
 252                                 }
 253
 254                                 branch_count++;
 255                                 branch(i, 0, 0,          // time
 256                                            stunt_growth, // stunt growth
 257                                            point, branch_velocity);
 258                         }
 259                 }
 260         }
 261
 262         time_t end_time; time(&end_time);
 263         if (end_time-start_time > 4)
 264                 synfig::info("Plant::sync() constructed %d particles in %d seconds\n",
 265                                          particle_list.size(), int(end_time-start_time));
 266         needs_sync_=false;
 267 }
 268
 269 bool
 270 Plant::set_param(const String & param, const ValueBase &value)
 271 {
 272         if(param=="bline" && value.get_type()==ValueBase::TYPE_LIST)
 273         {
 274                 bline=value;
 275                 bline_loop=value.get_loop();
 276                 needs_sync_=true;
 277
 278                 return true;
 279         }
 280         if(param=="seed" && value.same_type_as(int()))
 281         {
 282                 random.set_seed(value.get(int()));
 283                 needs_sync_=true;
 284                 return true;
 285         }
 286         IMPORT_PLUS(split_angle,needs_sync_=true);
 287         IMPORT_PLUS(gravity,needs_sync_=true);
 288         IMPORT_PLUS(gradient,needs_sync_=true);
 289         IMPORT_PLUS(velocity,needs_sync_=true);
 290         IMPORT_PLUS(perp_velocity,needs_sync_=true);
 291         IMPORT_PLUS(step,{
 292                         needs_sync_ = true;
 293                         if (step <= 0)
 294                                 step=0.01; // user is probably clueless - give a good default
 295                         else if (step < 0.00001)
 296                                 step=0.00001; // 100K should be enough for anyone
 297                         else if (step > 1)
 298                                 step=1;
 299                 });
 300         IMPORT_PLUS(splits,{
 301                         needs_sync_=true;
 302                         if (splits < 1)
 303                                 splits = 1;
 304                 });
 305         IMPORT_PLUS(sprouts,needs_sync_=true);
 306         IMPORT_PLUS(random_factor,needs_sync_=true);
 307         IMPORT_PLUS(drag,needs_sync_=true);
 308         IMPORT(size);
 309         IMPORT(size_as_alpha);
 310         IMPORT(reverse);
 311
 312         return Layer_Composite::set_param(param,value);
 313 }
 314 /*
 315 void
 316 Plant::set_time(Context context, Time time)const
 317 {
 318         if(needs_sync==true)
 319         {
 320                 sync();
 321                 needs_sync_=false;
 322         }
 323         //const_cast<Plant*>(this)->sync();
 324         context.set_time(time);
 325 }
 326
 327 void
 328 Plant::set_time(Context context, Time time, Vector pos)const
 329 {
 330         if(needs_sync==true)
 331         {
 332                 sync();
 333                 needs_sync_=false;
 334         }
 335         //const_cast<Plant*>(this)->sync();
 336         context.set_time(time,pos);
 337 }
 338 */
 339 ValueBase
 340 Plant::get_param(const String& param)const
 341 {
 342         if(param=="seed")
 343                 return random.get_seed();
 344         EXPORT(bline);
 345         EXPORT(split_angle);
 346         EXPORT(gravity);
 347         EXPORT(velocity);
 348         EXPORT(perp_velocity);
 349         EXPORT(step);
 350         EXPORT(gradient);
 351         EXPORT(splits);
 352         EXPORT(sprouts);
 353         EXPORT(random_factor);
 354         EXPORT(drag);
 355         EXPORT(size);
 356
 357         EXPORT(size_as_alpha);
 358         EXPORT(reverse);
 359
 360         EXPORT_NAME();
 361
 362         if(param=="Version" || param=="version" || param=="version__")
 363                 return version;
 364
 365         return Layer_Composite::get_param(param);
 366 }
 367
 368 Layer::Vocab
 369 Plant::get_param_vocab()const
 370 {
 371         Layer::Vocab ret(Layer_Composite::get_param_vocab());
 372
 373         ret.push_back(ParamDesc("bline")
 374                 .set_local_name(_("Vertices"))
 375                 .set_description(_("A list of BLine Points"))
 376                 //.set_origin("offset")
 377                 //.set_scalar("width")
 378         );
 379
 380         ret.push_back(ParamDesc("gradient")
 381                 .set_local_name(_("Gradient"))
 382                 .set_description(_("Gradient to be used for coloring the plant"))
 383         );
 384
 385         ret.push_back(ParamDesc("split_angle")
 386                 .set_local_name(_("Split Angle"))
 387                 .set_description(_("Angle by which each split deviates from its parent"))
 388         );
 389
 390         ret.push_back(ParamDesc("gravity")
 391                 .set_local_name(_("Gravity"))
 392                 .set_description(_("Direction in which the shoots tend to face"))
 393                 .set_is_distance()
 394         );
 395
 396         ret.push_back(ParamDesc("velocity")
 397                 .set_local_name(_("Tangential Velocity"))
 398                 .set_description(_("Amount to which shoots tend to grow along the tangent to the BLine"))
 399         );
 400
 401         ret.push_back(ParamDesc("perp_velocity")
 402                 .set_local_name(_("Perpendicular Velocity"))
 403                 .set_description(_("Amount to which shoots tend to grow perpendicular to the tangent to the BLine"))
 404         );
 405
 406         ret.push_back(ParamDesc("size")
 407                 .set_local_name(_("Stem Size"))
 408                 .set_description(_("Size of the stem"))
 409                 .set_is_distance()
 410         );
 411
 412         ret.push_back(ParamDesc("size_as_alpha")
 413                 .set_local_name(_("Size As Alpha"))
 414                 .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"))
 415         );
 416
 417         ret.push_back(ParamDesc("reverse")
 418                 .set_local_name(_("Reverse"))
 419                 .set_description(_("If enabled, render the plant in the opposite direction"))
 420         );
 421
 422         ret.push_back(ParamDesc("step")
 423                 .set_local_name(_("Step"))
 424                 .set_description(_("Measure of the distance between points when rendering"))
 425         );
 426
 427         ret.push_back(ParamDesc("seed")
 428                 .set_local_name(_("Seed"))
 429                 .set_description(_("Used to seed the pseudo-random number generator"))
 430         );
 431
 432         ret.push_back(ParamDesc("splits")
 433                 .set_local_name(_("Splits"))
 434                 .set_description(_("Maximum number of times that each sprout can sprout recursively"))
 435         );
 436
 437         ret.push_back(ParamDesc("sprouts")
 438                 .set_local_name(_("Sprouts"))
 439                 .set_description(_("Number of places that growth occurs on each bline section"))
 440         );
 441
 442         ret.push_back(ParamDesc("random_factor")
 443                 .set_local_name(_("Random Factor"))
 444                 .set_description(_("Used to scale down all random effects.  Set to zero to disable randomness"))
 445         );
 446
 447         ret.push_back(ParamDesc("drag")
 448                 .set_local_name(_("Drag"))
 449                 .set_description(_("Drag slows the growth"))
 450         );
 451
 452         return ret;
 453 }
 454
 455 bool
 456 Plant::set_version(const String &ver)
 457 {
 458         version = ver;
 459
 460         if (version == "0.1")
 461                 use_width = false;
 462
 463         return true;
 464 }
 465
 466 bool
 467 Plant::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
 468 {
 469         bool ret(context.accelerated_render(surface,quality,renddesc,cb));
 470         if(is_disabled() || !ret)
 471                 return ret;
 472
 473         Surface dest_surface;
 474         dest_surface.set_wh(surface->get_w(),surface->get_h());
 475         dest_surface.clear();
 476
 477         const Point     tl(renddesc.get_tl());
 478         const Point br(renddesc.get_br());
 479
 480         const int       w(renddesc.get_w());
 481         const int       h(renddesc.get_h());
 482
 483         const int       surface_width(surface->get_w());
 484         const int       surface_height(surface->get_h());
 485
 486         // Width and Height of a pixel
 487         const Real pw = (br[0] - tl[0]) / w;
 488         const Real ph = (br[1] - tl[1]) / h;
 489
 490         if (isinf(pw) || isinf(ph))
 491                 return true;
 492
 493         if(needs_sync_==true)
 494                 sync();
 495
 496         if (particle_list.begin() != particle_list.end())
 497         {
 498                 std::vector<Particle>::iterator iter;
 499                 Particle *particle;
 500
 501                 float radius(size*sqrt(1.0f/(abs(pw)*abs(ph))));
 502
 503                 int x1,y1,x2,y2;
 504
 505                 if (reverse)    iter = particle_list.end();
 506                 else                    iter = particle_list.begin();
 507
 508                 while (true)
 509                 {
 510                         if (reverse)    particle = &(*(iter-1));
 511                         else                    particle = &(*iter);
 512
 513                         float scaled_radius(radius);
 514                         Color color(particle->color);
 515                         if(size_as_alpha)
 516                         {
 517                                 scaled_radius*=color.get_a();
 518                                 color.set_a(1);
 519                         }
 520
 521                         // previously, radius was multiplied by sqrt(step)*12 only if
 522                         // the radius came out at less than 1 (pixel):
 523                         //   if (radius<=1.0f) radius*=sqrt(step)*12.0f;
 524                         // seems a little arbitrary - does it help?
 525
 526                         // calculate the box that this particle will be drawn as
 527                         float x1f=(particle->point[0]-tl[0])/pw-(scaled_radius*0.5);
 528                         float x2f=(particle->point[0]-tl[0])/pw+(scaled_radius*0.5);
 529                         float y1f=(particle->point[1]-tl[1])/ph-(scaled_radius*0.5);
 530                         float y2f=(particle->point[1]-tl[1])/ph+(scaled_radius*0.5);
 531                         x1=ceil_to_int(x1f);
 532                         x2=ceil_to_int(x2f)-1;
 533                         y1=ceil_to_int(y1f);
 534                         y2=ceil_to_int(y2f)-1;
 535
 536                         // if the box isn't entirely off the canvas, draw it
 537                         if(x1<=surface_width && y1<=surface_height && x2>=0 && y2>=0)
 538                         {
 539                                 float x1e=x1-x1f, x2e=x2f-x2, y1e=y1-y1f, y2e=y2f-y2;
 540                                 // printf("x1e %.4f x2e %.4f y1e %.4f y2e %.4f\n", x1e, x2e, y1e, y2e);
 541
 542                                 // adjust the box so it's entirely on the canvas
 543                                 if(x1<=0) { x1=0; x1e=0; }
 544                                 if(y1<=0) { y1=0; y1e=0; }
 545                                 if(x2>=surface_width)  { x2=surface_width;  x2e=0; }
 546                                 if(y2>=surface_height) { y2=surface_height; y2e=0; }
 547
 548                                 int w(x2-x1), h(y2-y1);
 549
 550                                 Surface::alpha_pen surface_pen(dest_surface.get_pen(x1,y1),1.0f);
 551                                 if(w>0 && h>0)
 552                                         dest_surface.fill(color,surface_pen,w,h);
 553
 554                                 /* the rectangle doesn't cross any vertical pixel boundaries so we don't
 555                                  * need to draw any top or bottom edges
 556                                  */
 557                                 if(x2<x1)
 558                                 {
 559                                         // case 1 - a single pixel
 560                                         if(y2<y1)
 561                                         {
 562                                                 surface_pen.move_to(x2,y2);
 563                                                 surface_pen.set_alpha((x2f-x1f)*(y2f-y1f));
 564                                                 surface_pen.put_value(color);
 565                                         }
 566                                         // case 2 - a single vertical column of pixels
 567                                         else
 568                                         {
 569                                                 surface_pen.move_to(x2,y1-1);
 570                                                 if (y1e!=0)     // maybe draw top pixel
 571                                                 {
 572                                                         surface_pen.set_alpha(y1e*(x2f-x1f));
 573                                                         surface_pen.put_value(color);
 574                                                 }
 575                                                 surface_pen.inc_y();
 576                                                 surface_pen.set_alpha(x2f-x1f);
 577                                                 for(int i=y1; i<y2; i++) // maybe draw pixels between
 578                                                 {
 579                                                         surface_pen.put_value(color);
 580                                                         surface_pen.inc_y();
 581                                                 }
 582                                                 if (y2e!=0)     // maybe draw bottom pixel
 583                                                 {
 584                                                         surface_pen.set_alpha(y2e*(x2f-x1f));
 585                                                         surface_pen.put_value(color);
 586                                                 }
 587                                         }
 588                                 }
 589                                 else
 590                                 {
 591                                         // case 3 - a single horizontal row of pixels
 592                                         if(y2<y1)
 593                                         {
 594                                                 surface_pen.move_to(x1-1,y2);
 595                                                 if (x1e!=0)     // maybe draw left pixel
 596                                                 {
 597                                                         surface_pen.set_alpha(x1e*(y2f-y1f));
 598                                                         surface_pen.put_value(color);
 599                                                 }
 600                                                 surface_pen.inc_x();
 601                                                 surface_pen.set_alpha(y2f-y1f);
 602                                                 for(int i=x1; i<x2; i++) // maybe draw pixels between
 603                                                 {
 604                                                         surface_pen.put_value(color);
 605                                                         surface_pen.inc_x();
 606                                                 }
 607                                                 if (x2e!=0)     // maybe draw right pixel
 608                                                 {
 609                                                         surface_pen.set_alpha(x2e*(y2f-y1f));
 610                                                         surface_pen.put_value(color);
 611                                                 }
 612                                         }
 613                                         // case 4 - a proper block of pixels
 614                                         else
 615                                         {
 616                                                 if (x1e!=0)     // maybe draw left edge
 617                                                 {
 618                                                         surface_pen.move_to(x1-1,y1-1);
 619                                                         if (y1e!=0)     // maybe draw top left pixel
 620                                                         {
 621                                                                 surface_pen.set_alpha(x1e*y1e);
 622                                                                 surface_pen.put_value(color);
 623                                                         }
 624                                                         surface_pen.inc_y();
 625                                                         surface_pen.set_alpha(x1e);
 626                                                         for(int i=y1; i<y2; i++) // maybe draw pixels along the left edge
 627                                                         {
 628                                                                 surface_pen.put_value(color);
 629                                                                 surface_pen.inc_y();
 630                                                         }
 631                                                         if (y2e!=0)     // maybe draw bottom left pixel
 632                                                         {
 633                                                                 surface_pen.set_alpha(x1e*y2e);
 634                                                                 surface_pen.put_value(color);
 635                                                         }
 636                                                         surface_pen.inc_x();
 637                                                 }
 638                                                 else
 639                                                         surface_pen.move_to(x1,y2);
 640
 641                                                 if (y2e!=0)     // maybe draw bottom edge
 642                                                 {
 643                                                         surface_pen.set_alpha(y2e);
 644                                                         for(int i=x1; i<x2; i++) // maybe draw pixels along the bottom edge
 645                                                         {
 646                                                                 surface_pen.put_value(color);
 647                                                                 surface_pen.inc_x();
 648                                                         }
 649                                                         if (x2e!=0)     // maybe draw bottom right pixel
 650                                                         {
 651                                                                 surface_pen.set_alpha(x2e*y2e);
 652                                                                 surface_pen.put_value(color);
 653                                                         }
 654                                                         surface_pen.dec_y();
 655                                                 }
 656                                                 else
 657                                                         surface_pen.move_to(x2,y2-1);
 658
 659                                                 if (x2e!=0)     // maybe draw right edge
 660                                                 {
 661                                                         surface_pen.set_alpha(x2e);
 662                                                         for(int i=y1; i<y2; i++) // maybe draw pixels along the right edge
 663                                                         {
 664                                                                 surface_pen.put_value(color);
 665                                                                 surface_pen.dec_y();
 666                                                         }
 667                                                         if (y1e!=0)     // maybe draw top right pixel
 668                                                         {
 669                                                                 surface_pen.set_alpha(x2e*y1e);
 670                                                                 surface_pen.put_value(color);
 671                                                         }
 672                                                         surface_pen.dec_x();
 673                                                 }
 674                                                 else
 675                                                         surface_pen.move_to(x2-1,y1-1);
 676
 677                                                 if (y1e!=0)     // maybe draw top edge
 678                                                 {
 679                                                         surface_pen.set_alpha(y1e);
 680                                                         for(int i=x1; i<x2; i++) // maybe draw pixels along the top edge
 681                                                         {
 682                                                                 surface_pen.put_value(color);
 683                                                                 surface_pen.dec_x();
 684                                                         }
 685                                                 }
 686                                         }
 687                                 }
 688                         }
 689
 690                         if (reverse)
 691                         {
 692                                 if (--iter == particle_list.begin())
 693                                         break;
 694                         }
 695                         else
 696                         {
 697                                 if (++iter == particle_list.end())
 698                                         break;
 699                         }
 700                 }
 701         }
 702
 703         Surface::alpha_pen pen(surface->get_pen(0,0),get_amount(),get_blend_method());
 704         dest_surface.blit_to(pen);
 705
 706         return true;
 707 }
 708
 709 Rect
 710 Plant::get_bounding_rect(Context context)const
 711 {
 712         if(needs_sync_==true)
 713                 sync();
 714
 715         if(is_disabled())
 716                 return Rect::zero();
 717
 718         if(Color::is_onto(get_blend_method()))
 719                 return context.get_full_bounding_rect() & bounding_rect;
 720
 721         //if(get_blend_method()==Color::BLEND_BEHIND)
 722         //      return context.get_full_bounding_rect() | bounding_rect;
 723         return bounding_rect;
 724 }