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