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, 2008 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         offset(0,0),
  80         split_angle(Angle::deg(10)),
  81         gravity(0,-0.1),
  82         velocity(0.3),
  83         perp_velocity(0.0),
  84         step(0.01),
  85         sprouts(10),
  86         version(version__),
  87         use_width(true)
  88 {
  89         bounding_rect=Rect::zero();
  90         random_factor=0.2;
  91         random.set_seed(time(NULL));
  92
  93         bline.push_back(BLinePoint());
  94         bline.push_back(BLinePoint());
  95         bline.push_back(BLinePoint());
  96         bline[0].set_vertex(Point(0,1));
  97         bline[1].set_vertex(Point(0,-1));
  98         bline[2].set_vertex(Point(1,0));
  99         bline[0].set_tangent(bline[1].get_vertex()-bline[2].get_vertex()*0.5f);
 100         bline[1].set_tangent(bline[2].get_vertex()-bline[0].get_vertex()*0.5f);
 101         bline[2].set_tangent(bline[0].get_vertex()-bline[1].get_vertex()*0.5f);
 102         bline[0].set_width(1.0f);
 103         bline[1].set_width(1.0f);
 104         bline[2].set_width(1.0f);
 105         bline_loop=true;
 106         mass=(0.5);
 107         splits=5;
 108         drag=0.1;
 109         size=0.015;
 110         needs_sync_=true;
 111         sync();
 112         size_as_alpha=false;
 113         reverse=true;
 114 }
 115
 116 void
 117 Plant::branch(int n,int depth,float t, float stunt_growth, synfig::Point position,synfig::Vector vel)const
 118 {
 119         float next_split((1.0-t)/(splits-depth)+t/*+random_factor*random(40+depth,t*splits,0,0)/splits*/);
 120         for(;t<next_split;t+=step)
 121         {
 122                 vel[0]+=gravity[0]*step;
 123                 vel[1]+=gravity[1]*step;
 124                 vel*=(1.0-(drag)*step);
 125                 position[0]+=vel[0]*step;
 126                 position[1]+=vel[1]*step;
 127
 128                 particle_list.push_back(Particle(position, gradient(t)));
 129                 if (particle_list.size() % 1000000 == 0)
 130                         synfig::info("constructed %d million particles...", particle_list.size()/1000000);
 131
 132                 bounding_rect.expand(position);
 133         }
 134
 135         if(t>=1.0-stunt_growth)return;
 136
 137         synfig::Real sin_v=synfig::Angle::cos(split_angle).get();
 138         synfig::Real cos_v=synfig::Angle::sin(split_angle).get();
 139
 140         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),
 141                                                          vel[0]*cos_v + vel[1]*sin_v + random_factor*random(Random::SMOOTH_COSINE, 32+n+depth, t*splits, 0.0f, 0.0f));
 142         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),
 143                                                         -vel[0]*cos_v + vel[1]*sin_v + random_factor*random(Random::SMOOTH_COSINE, 33+n+depth, t*splits, 0.0f, 0.0f));
 144
 145         Plant::branch(n,depth+1,t,stunt_growth,position,velocity1);
 146         Plant::branch(n,depth+1,t,stunt_growth,position,velocity2);
 147 }
 148
 149 void
 150 Plant::calc_bounding_rect()const
 151 {
 152         std::vector<synfig::BLinePoint>::const_iterator iter,next;
 153
 154         bounding_rect=Rect::zero();
 155
 156         // Bline must have at least 2 points in it
 157         if(bline.size()<2)
 158                 return;
 159
 160         next=bline.begin();
 161
 162         if(bline_loop)
 163                 iter=--bline.end();
 164         else
 165                 iter=next++;
 166
 167         for(;next!=bline.end();iter=next++)
 168         {
 169                 bounding_rect.expand(iter->get_vertex());
 170                 bounding_rect.expand(next->get_vertex());
 171                 bounding_rect.expand(iter->get_vertex()+iter->get_tangent2()*0.3333333333333);
 172                 bounding_rect.expand(next->get_vertex()-next->get_tangent1()*0.3333333333333);
 173                 bounding_rect.expand(next->get_vertex()+next->get_tangent2()*velocity);
 174         }
 175         bounding_rect.expand_x(gravity[0]);
 176         bounding_rect.expand_y(gravity[1]);
 177         bounding_rect.expand_x(size);
 178         bounding_rect.expand_y(size);
 179 }
 180
 181 void
 182 Plant::sync()const
 183 {
 184         Mutex::Lock lock(mutex);
 185         if (!needs_sync_) return;
 186         time_t start_time; time(&start_time);
 187         particle_list.clear();
 188
 189         bounding_rect=Rect::zero();
 190
 191         // Bline must have at least 2 points in it
 192         if(bline.size()<2)
 193         {
 194                 needs_sync_=false;
 195                 return;
 196         }
 197
 198         std::vector<synfig::BLinePoint>::const_iterator iter,next;
 199
 200         etl::hermite<Vector> curve;
 201
 202         Real step(abs(this->step));
 203
 204         int seg(0);
 205
 206         next=bline.begin();
 207
 208         if(bline_loop)  iter=--bline.end(); // iter is the last  bline in the list; next is the first  bline in the list
 209         else                    iter=next++;            // iter is the first bline in the list; next is the second bline in the list
 210
 211         // loop through the bline; seg counts the blines as we do so; stop before iter is the last bline in the list
 212         for(;next!=bline.end();iter=next++,seg++)
 213         {
 214                 float iterw=iter->get_width();  // the width value of the iter vertex
 215                 float nextw=next->get_width();  // the width value of the next vertex
 216                 float width;                                    // the width at an intermediate position
 217                 curve.p1()=iter->get_vertex();
 218                 curve.t1()=iter->get_tangent2();
 219                 curve.p2()=next->get_vertex();
 220                 curve.t2()=next->get_tangent1();
 221                 curve.sync();
 222                 etl::derivative<etl::hermite<Vector> > deriv(curve);
 223
 224                 Real f;
 225
 226                 int i=0, branch_count = 0, steps = round_to_int(1.0/step);
 227                 if (steps < 1) steps = 1;
 228                 for(f=0.0;f<1.0;f+=step,i++)
 229                 {
 230                         Point point(curve(f));
 231
 232                         particle_list.push_back(Particle(point, gradient(0)));
 233                         if (particle_list.size() % 1000000 == 0)
 234                                 synfig::info("constructed %d million particles...", particle_list.size()/1000000);
 235
 236                         bounding_rect.expand(point);
 237
 238                         Real stunt_growth(random_factor * (random(Random::SMOOTH_COSINE,i,f+seg,0.0f,0.0f)/2.0+0.5));
 239                         stunt_growth*=stunt_growth;
 240
 241                         if((((i+1)*sprouts + steps/2) / steps) > branch_count) {
 242                                 Vector branch_velocity(deriv(f).norm()*velocity + deriv(f).perp().norm()*perp_velocity);
 243
 244                                 if (isnan(branch_velocity[0]) || isnan(branch_velocity[1]))
 245                                         continue;
 246
 247                                 branch_velocity[0] += random_factor * random(Random::SMOOTH_COSINE, 1, f*splits, 0.0f, 0.0f);
 248                                 branch_velocity[1] += random_factor * random(Random::SMOOTH_COSINE, 2, f*splits, 0.0f, 0.0f);
 249
 250                                 if (use_width)
 251                                 {
 252                                         width = iterw+(nextw-iterw)*f; // calculate the width based on the current position
 253
 254                                         branch_velocity[0] *= width; // scale the velocity accordingly to the current width
 255                                         branch_velocity[1] *= width;
 256                                 }
 257
 258                                 branch_count++;
 259                                 branch(i, 0, 0,          // time
 260                                            stunt_growth, // stunt growth
 261                                            point, branch_velocity);
 262                         }
 263                 }
 264         }
 265
 266         time_t end_time; time(&end_time);
 267         if (end_time-start_time > 4)
 268                 synfig::info("Plant::sync() constructed %d particles in %d seconds\n",
 269                                          particle_list.size(), int(end_time-start_time));
 270         needs_sync_=false;
 271 }
 272
 273 bool
 274 Plant::set_param(const String & param, const ValueBase &value)
 275 {
 276         if(param=="bline" && value.get_type()==ValueBase::TYPE_LIST)
 277         {
 278                 bline=value;
 279                 bline_loop=value.get_loop();
 280                 needs_sync_=true;
 281
 282                 return true;
 283         }
 284         if(param=="seed" && value.same_type_as(int()))
 285         {
 286                 random.set_seed(value.get(int()));
 287                 needs_sync_=true;
 288                 return true;
 289         }
 290         IMPORT(offset);
 291         IMPORT_PLUS(split_angle,needs_sync_=true);
 292         IMPORT_PLUS(gravity,needs_sync_=true);
 293         IMPORT_PLUS(gradient,needs_sync_=true);
 294         IMPORT_PLUS(velocity,needs_sync_=true);
 295         IMPORT_PLUS(perp_velocity,needs_sync_=true);
 296         IMPORT_PLUS(step,{
 297                         needs_sync_ = true;
 298                         if (step <= 0)
 299                                 step=0.01; // user is probably clueless - give a good default
 300                         else if (step < 0.00001)
 301                                 step=0.00001; // 100K should be enough for anyone
 302                         else if (step > 1)
 303                                 step=1;
 304                 });
 305         IMPORT_PLUS(splits,{
 306                         needs_sync_=true;
 307                         if (splits < 1)
 308                                 splits = 1;
 309                 });
 310         IMPORT_PLUS(sprouts,needs_sync_=true);
 311         IMPORT_PLUS(random_factor,needs_sync_=true);
 312         IMPORT_PLUS(drag,needs_sync_=true);
 313         IMPORT(size);
 314         IMPORT(size_as_alpha);
 315         IMPORT(reverse);
 316
 317         return Layer_Composite::set_param(param,value);
 318 }
 319 /*
 320 void
 321 Plant::set_time(Context context, Time time)const
 322 {
 323         if(needs_sync==true)
 324         {
 325                 sync();
 326                 needs_sync_=false;
 327         }
 328         //const_cast<Plant*>(this)->sync();
 329         context.set_time(time);
 330 }
 331
 332 void
 333 Plant::set_time(Context context, Time time, Vector pos)const
 334 {
 335         if(needs_sync==true)
 336         {
 337                 sync();
 338                 needs_sync_=false;
 339         }
 340         //const_cast<Plant*>(this)->sync();
 341         context.set_time(time,pos);
 342 }
 343 */
 344 ValueBase
 345 Plant::get_param(const String& param)const
 346 {
 347         if(param=="seed")
 348                 return random.get_seed();
 349         EXPORT(bline);
 350         EXPORT(offset);
 351         EXPORT(split_angle);
 352         EXPORT(gravity);
 353         EXPORT(velocity);
 354         EXPORT(perp_velocity);
 355         EXPORT(step);
 356         EXPORT(gradient);
 357         EXPORT(splits);
 358         EXPORT(sprouts);
 359         EXPORT(random_factor);
 360         EXPORT(drag);
 361         EXPORT(size);
 362
 363         EXPORT(size_as_alpha);
 364         EXPORT(reverse);
 365
 366         EXPORT_NAME();
 367
 368         if(param=="Version" || param=="version" || param=="version__")
 369                 return version;
 370
 371         return Layer_Composite::get_param(param);
 372 }
 373
 374 Layer::Vocab
 375 Plant::get_param_vocab()const
 376 {
 377         Layer::Vocab ret(Layer_Composite::get_param_vocab());
 378
 379         ret.push_back(ParamDesc("bline")
 380                 .set_local_name(_("Vertices"))
 381                 .set_description(_("A list of BLine Points"))
 382                 .set_origin("offset")
 383                 .set_hint("width")
 384         );
 385
 386         ret.push_back(ParamDesc("offset")
 387                 .set_local_name(_("Offset"))
 388         );
 389
 390         ret.push_back(ParamDesc("gradient")
 391                 .set_local_name(_("Gradient"))
 392                 .set_description(_("Gradient to be used for coloring the plant"))
 393         );
 394
 395         ret.push_back(ParamDesc("split_angle")
 396                 .set_local_name(_("Split Angle"))
 397                 .set_description(_("Angle by which each split deviates from its parent"))
 398         );
 399
 400         ret.push_back(ParamDesc("gravity")
 401                 .set_local_name(_("Gravity"))
 402                 .set_description(_("Direction in which the shoots tend to face"))
 403                 .set_is_distance()
 404         );
 405
 406         ret.push_back(ParamDesc("velocity")
 407                 .set_local_name(_("Tangential Velocity"))
 408                 .set_description(_("Amount to which shoots tend to grow along the tangent to the BLine"))
 409         );
 410
 411         ret.push_back(ParamDesc("perp_velocity")
 412                 .set_local_name(_("Perpendicular Velocity"))
 413                 .set_description(_("Amount to which shoots tend to grow perpendicular to the tangent to the BLine"))
 414         );
 415
 416         ret.push_back(ParamDesc("size")
 417                 .set_local_name(_("Stem Size"))
 418                 .set_description(_("Size of the stem"))
 419                 .set_is_distance()
 420         );
 421
 422         ret.push_back(ParamDesc("size_as_alpha")
 423                 .set_local_name(_("Size As Alpha"))
 424                 .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"))
 425         );
 426
 427         ret.push_back(ParamDesc("reverse")
 428                 .set_local_name(_("Reverse"))
 429                 .set_description(_("If enabled, render the plant in the opposite direction"))
 430         );
 431
 432         ret.push_back(ParamDesc("step")
 433                 .set_local_name(_("Step"))
 434                 .set_description(_("Measure of the distance between points when rendering"))
 435         );
 436
 437         ret.push_back(ParamDesc("seed")
 438                 .set_local_name(_("Seed"))
 439                 .set_description(_("Used to seed the pseudo-random number generator"))
 440         );
 441
 442         ret.push_back(ParamDesc("splits")
 443                 .set_local_name(_("Splits"))
 444                 .set_description(_("Maximum number of times that each sprout can sprout recursively"))
 445         );
 446
 447         ret.push_back(ParamDesc("sprouts")
 448                 .set_local_name(_("Sprouts"))
 449                 .set_description(_("Number of places that growth occurs on each bline section"))
 450         );
 451
 452         ret.push_back(ParamDesc("random_factor")
 453                 .set_local_name(_("Random Factor"))
 454                 .set_description(_("Used to scale down all random effects.  Set to zero to disable randomness"))
 455         );
 456
 457         ret.push_back(ParamDesc("drag")
 458                 .set_local_name(_("Drag"))
 459                 .set_description(_("Drag slows the growth"))
 460         );
 461
 462         return ret;
 463 }
 464
 465 bool
 466 Plant::set_version(const String &ver)
 467 {
 468         version = ver;
 469
 470         if (version == "0.1")
 471                 use_width = false;
 472
 473         return true;
 474 }
 475
 476 bool
 477 Plant::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
 478 {
 479         bool ret(context.accelerated_render(surface,quality,renddesc,cb));
 480         if(is_disabled() || !ret)
 481                 return ret;
 482
 483         Surface dest_surface;
 484         dest_surface.set_wh(surface->get_w(),surface->get_h());
 485         dest_surface.clear();
 486
 487         const Point     tl(renddesc.get_tl()-offset);
 488         const Point br(renddesc.get_br()-offset);
 489
 490         const int       w(renddesc.get_w());
 491         const int       h(renddesc.get_h());
 492
 493         const int       surface_width(surface->get_w());
 494         const int       surface_height(surface->get_h());
 495
 496         // Width and Height of a pixel
 497         const Real pw = (br[0] - tl[0]) / w;
 498         const Real ph = (br[1] - tl[1]) / h;
 499
 500         if (isinf(pw) || isinf(ph))
 501                 return true;
 502
 503         if(needs_sync_==true)
 504                 sync();
 505
 506         if (particle_list.begin() != particle_list.end())
 507         {
 508                 std::vector<Particle>::iterator iter;
 509                 Particle *particle;
 510
 511                 float radius(size*sqrt(1.0f/(abs(pw)*abs(ph))));
 512
 513                 int x1,y1,x2,y2;
 514
 515                 if (reverse)    iter = particle_list.end();
 516                 else                    iter = particle_list.begin();
 517
 518                 while (true)
 519                 {
 520                         if (reverse)    particle = &(*(iter-1));
 521                         else                    particle = &(*iter);
 522
 523                         float scaled_radius(radius);
 524                         Color color(particle->color);
 525                         if(size_as_alpha)
 526                         {
 527                                 scaled_radius*=color.get_a();
 528                                 color.set_a(1);
 529                         }
 530
 531                         // previously, radius was multiplied by sqrt(step)*12 only if
 532                         // the radius came out at less than 1 (pixel):
 533                         //   if (radius<=1.0f) radius*=sqrt(step)*12.0f;
 534                         // seems a little arbitrary - does it help?
 535
 536                         // calculate the box that this particle will be drawn as
 537                         float x1f=(particle->point[0]-tl[0])/pw-(scaled_radius*0.5);
 538                         float x2f=(particle->point[0]-tl[0])/pw+(scaled_radius*0.5);
 539                         float y1f=(particle->point[1]-tl[1])/ph-(scaled_radius*0.5);
 540                         float y2f=(particle->point[1]-tl[1])/ph+(scaled_radius*0.5);
 541                         x1=ceil_to_int(x1f);
 542                         x2=ceil_to_int(x2f)-1;
 543                         y1=ceil_to_int(y1f);
 544                         y2=ceil_to_int(y2f)-1;
 545
 546                         // if the box isn't entirely off the canvas, draw it
 547                         if(x1<=surface_width && y1<=surface_height && x2>=0 && y2>=0)
 548                         {
 549                                 float x1e=x1-x1f, x2e=x2f-x2, y1e=y1-y1f, y2e=y2f-y2;
 550                                 // printf("x1e %.4f x2e %.4f y1e %.4f y2e %.4f\n", x1e, x2e, y1e, y2e);
 551
 552                                 // adjust the box so it's entirely on the canvas
 553                                 if(x1<=0) { x1=0; x1e=0; }
 554                                 if(y1<=0) { y1=0; y1e=0; }
 555                                 if(x2>=surface_width)  { x2=surface_width;  x2e=0; }
 556                                 if(y2>=surface_height) { y2=surface_height; y2e=0; }
 557
 558                                 int w(x2-x1), h(y2-y1);
 559
 560                                 Surface::alpha_pen surface_pen(dest_surface.get_pen(x1,y1),1.0f);
 561                                 if(w>0 && h>0)
 562                                         dest_surface.fill(color,surface_pen,w,h);
 563
 564                                 /* the rectangle doesn't cross any vertical pixel boundaries so we don't
 565                                  * need to draw any top or bottom edges
 566                                  */
 567                                 if(x2<x1)
 568                                 {
 569                                         // case 1 - a single pixel
 570                                         if(y2<y1)
 571                                         {
 572                                                 surface_pen.move_to(x2,y2);
 573                                                 surface_pen.set_alpha((x2f-x1f)*(y2f-y1f));
 574                                                 surface_pen.put_value(color);
 575                                         }
 576                                         // case 2 - a single vertical column of pixels
 577                                         else
 578                                         {
 579                                                 surface_pen.move_to(x2,y1-1);
 580                                                 if (y1e!=0)     // maybe draw top pixel
 581                                                 {
 582                                                         surface_pen.set_alpha(y1e*(x2f-x1f));
 583                                                         surface_pen.put_value(color);
 584                                                 }
 585                                                 surface_pen.inc_y();
 586                                                 surface_pen.set_alpha(x2f-x1f);
 587                                                 for(int i=y1; i<y2; i++) // maybe draw pixels between
 588                                                 {
 589                                                         surface_pen.put_value(color);
 590                                                         surface_pen.inc_y();
 591                                                 }
 592                                                 if (y2e!=0)     // maybe draw bottom pixel
 593                                                 {
 594                                                         surface_pen.set_alpha(y2e*(x2f-x1f));
 595                                                         surface_pen.put_value(color);
 596                                                 }
 597                                         }
 598                                 }
 599                                 else
 600                                 {
 601                                         // case 3 - a single horizontal row of pixels
 602                                         if(y2<y1)
 603                                         {
 604                                                 surface_pen.move_to(x1-1,y2);
 605                                                 if (x1e!=0)     // maybe draw left pixel
 606                                                 {
 607                                                         surface_pen.set_alpha(x1e*(y2f-y1f));
 608                                                         surface_pen.put_value(color);
 609                                                 }
 610                                                 surface_pen.inc_x();
 611                                                 surface_pen.set_alpha(y2f-y1f);
 612                                                 for(int i=x1; i<x2; i++) // maybe draw pixels between
 613                                                 {
 614                                                         surface_pen.put_value(color);
 615                                                         surface_pen.inc_x();
 616                                                 }
 617                                                 if (x2e!=0)     // maybe draw right pixel
 618                                                 {
 619                                                         surface_pen.set_alpha(x2e*(y2f-y1f));
 620                                                         surface_pen.put_value(color);
 621                                                 }
 622                                         }
 623                                         // case 4 - a proper block of pixels
 624                                         else
 625                                         {
 626                                                 if (x1e!=0)     // maybe draw left edge
 627                                                 {
 628                                                         surface_pen.move_to(x1-1,y1-1);
 629                                                         if (y1e!=0)     // maybe draw top left pixel
 630                                                         {
 631                                                                 surface_pen.set_alpha(x1e*y1e);
 632                                                                 surface_pen.put_value(color);
 633                                                         }
 634                                                         surface_pen.inc_y();
 635                                                         surface_pen.set_alpha(x1e);
 636                                                         for(int i=y1; i<y2; i++) // maybe draw pixels along the left edge
 637                                                         {
 638                                                                 surface_pen.put_value(color);
 639                                                                 surface_pen.inc_y();
 640                                                         }
 641                                                         if (y2e!=0)     // maybe draw bottom left pixel
 642                                                         {
 643                                                                 surface_pen.set_alpha(x1e*y2e);
 644                                                                 surface_pen.put_value(color);
 645                                                         }
 646                                                         surface_pen.inc_x();
 647                                                 }
 648                                                 else
 649                                                         surface_pen.move_to(x1,y2);
 650
 651                                                 if (y2e!=0)     // maybe draw bottom edge
 652                                                 {
 653                                                         surface_pen.set_alpha(y2e);
 654                                                         for(int i=x1; i<x2; i++) // maybe draw pixels along the bottom edge
 655                                                         {
 656                                                                 surface_pen.put_value(color);
 657                                                                 surface_pen.inc_x();
 658                                                         }
 659                                                         if (x2e!=0)     // maybe draw bottom right pixel
 660                                                         {
 661                                                                 surface_pen.set_alpha(x2e*y2e);
 662                                                                 surface_pen.put_value(color);
 663                                                         }
 664                                                         surface_pen.dec_y();
 665                                                 }
 666                                                 else
 667                                                         surface_pen.move_to(x2,y2-1);
 668
 669                                                 if (x2e!=0)     // maybe draw right edge
 670                                                 {
 671                                                         surface_pen.set_alpha(x2e);
 672                                                         for(int i=y1; i<y2; i++) // maybe draw pixels along the right edge
 673                                                         {
 674                                                                 surface_pen.put_value(color);
 675                                                                 surface_pen.dec_y();
 676                                                         }
 677                                                         if (y1e!=0)     // maybe draw top right pixel
 678                                                         {
 679                                                                 surface_pen.set_alpha(x2e*y1e);
 680                                                                 surface_pen.put_value(color);
 681                                                         }
 682                                                         surface_pen.dec_x();
 683                                                 }
 684                                                 else
 685                                                         surface_pen.move_to(x2-1,y1-1);
 686
 687                                                 if (y1e!=0)     // maybe draw top edge
 688                                                 {
 689                                                         surface_pen.set_alpha(y1e);
 690                                                         for(int i=x1; i<x2; i++) // maybe draw pixels along the top edge
 691                                                         {
 692                                                                 surface_pen.put_value(color);
 693                                                                 surface_pen.dec_x();
 694                                                         }
 695                                                 }
 696                                         }
 697                                 }
 698                         }
 699
 700                         if (reverse)
 701                         {
 702                                 if (--iter == particle_list.begin())
 703                                         break;
 704                         }
 705                         else
 706                         {
 707                                 if (++iter == particle_list.end())
 708                                         break;
 709                         }
 710                 }
 711         }
 712
 713         Surface::alpha_pen pen(surface->get_pen(0,0),get_amount(),get_blend_method());
 714         dest_surface.blit_to(pen);
 715
 716         return true;
 717 }
 718
 719 Rect
 720 Plant::get_bounding_rect(Context context)const
 721 {
 722         if(needs_sync_==true)
 723                 sync();
 724
 725         if(is_disabled())
 726                 return Rect::zero();
 727
 728         if(Color::is_onto(get_blend_method()))
 729                 return context.get_full_bounding_rect() & bounding_rect;
 730
 731         //if(get_blend_method()==Color::BLEND_BEHIND)
 732         //      return context.get_full_bounding_rect() | bounding_rect;
 733         return bounding_rect;
 734 }