synfig-core/tags/synfig_0_61_07_rc3/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                 for(f=0.0;f<1.0;f+=step,i++)
 221                 {
 222                         Point point(curve(f));
 223
 224                         particle_list.push_back(Particle(point, gradient(0)));
 225                         if (particle_list.size() % 1000000 == 0)
 226                                 synfig::info("constructed %d million particles...", particle_list.size()/1000000);
 227
 228                         bounding_rect.expand(point);
 229
 230                         Real stunt_growth(random_factor * (random(Random::SMOOTH_COSINE,i,f+seg,0.0f,0.0f)/2.0+0.5));
 231                         stunt_growth*=stunt_growth;
 232
 233                         if((((i+1)*sprouts + steps/2) / steps) > branch_count) {
 234                                 Vector branch_velocity(deriv(f).norm()*velocity + deriv(f).perp().norm()*perp_velocity);
 235
 236                                 branch_velocity[0] += random_factor * random(Random::SMOOTH_COSINE, 1, f*splits, 0.0f, 0.0f);
 237                                 branch_velocity[1] += random_factor * random(Random::SMOOTH_COSINE, 2, f*splits, 0.0f, 0.0f);
 238
 239                                 branch_count++;
 240                                 branch(i, 0, 0,          // time
 241                                            stunt_growth, // stunt growth
 242                                            point, branch_velocity);
 243                         }
 244                 }
 245         }
 246
 247         time_t end_time; time(&end_time);
 248         if (end_time-start_time > 4)
 249                 synfig::info("Plant::sync() constructed %d particles in %d seconds\n",
 250                                          particle_list.size(), int(end_time-start_time));
 251         needs_sync_=false;
 252 }
 253
 254 bool
 255 Plant::set_param(const String & param, const ValueBase &value)
 256 {
 257         if(param=="bline" && value.get_type()==ValueBase::TYPE_LIST)
 258         {
 259                 bline=value;
 260                 bline_loop=value.get_loop();
 261                 needs_sync_=true;
 262
 263                 return true;
 264         }
 265         if(param=="seed" && value.same_type_as(int()))
 266         {
 267                 random.set_seed(value.get(int()));
 268                 needs_sync_=true;
 269                 return true;
 270         }
 271         IMPORT_PLUS(split_angle,needs_sync_=true);
 272         IMPORT_PLUS(gravity,needs_sync_=true);
 273         IMPORT_PLUS(gradient,needs_sync_=true);
 274         IMPORT_PLUS(velocity,needs_sync_=true);
 275         IMPORT_PLUS(perp_velocity,needs_sync_=true);
 276         IMPORT_PLUS(step,needs_sync_=true);
 277         IMPORT_PLUS(splits,needs_sync_=true);
 278         IMPORT_PLUS(sprouts,needs_sync_=true);
 279         IMPORT_PLUS(random_factor,needs_sync_=true);
 280         IMPORT_PLUS(drag,needs_sync_=true);
 281         IMPORT(size);
 282         IMPORT(size_as_alpha);
 283
 284         return Layer_Composite::set_param(param,value);
 285 }
 286 /*
 287 void
 288 Plant::set_time(Context context, Time time)const
 289 {
 290         if(needs_sync==true)
 291         {
 292                 sync();
 293                 needs_sync_=false;
 294         }
 295         //const_cast<Plant*>(this)->sync();
 296         context.set_time(time);
 297 }
 298
 299 void
 300 Plant::set_time(Context context, Time time, Vector pos)const
 301 {
 302         if(needs_sync==true)
 303         {
 304                 sync();
 305                 needs_sync_=false;
 306         }
 307         //const_cast<Plant*>(this)->sync();
 308         context.set_time(time,pos);
 309 }
 310 */
 311 ValueBase
 312 Plant::get_param(const String& param)const
 313 {
 314         if(param=="seed")
 315                 return random.get_seed();
 316         EXPORT(bline);
 317         EXPORT(split_angle);
 318         EXPORT(gravity);
 319         EXPORT(velocity);
 320         EXPORT(perp_velocity);
 321         EXPORT(step);
 322         EXPORT(gradient);
 323         EXPORT(splits);
 324         EXPORT(sprouts);
 325         EXPORT(random_factor);
 326         EXPORT(drag);
 327         EXPORT(size);
 328
 329         EXPORT(size_as_alpha);
 330
 331         EXPORT_NAME();
 332         EXPORT_VERSION();
 333
 334         return Layer_Composite::get_param(param);
 335 }
 336
 337 Layer::Vocab
 338 Plant::get_param_vocab()const
 339 {
 340         Layer::Vocab ret(Layer_Composite::get_param_vocab());
 341
 342         ret.push_back(ParamDesc("bline")
 343                 .set_local_name(_("Vertices"))
 344                 .set_description(_("A list of BLine Points"))
 345                 //.set_origin("offset")
 346                 //.set_scalar("width")
 347         );
 348
 349         ret.push_back(ParamDesc("gradient")
 350                 .set_local_name(_("Gradient"))
 351                 .set_description(_("Gradient to be used for coloring the plant"))
 352         );
 353
 354         ret.push_back(ParamDesc("split_angle")
 355                 .set_local_name(_("Split Angle"))
 356                 .set_description(_("Angle by which each split deviates from its parent"))
 357         );
 358
 359         ret.push_back(ParamDesc("gravity")
 360                 .set_local_name(_("Gravity"))
 361                 .set_description(_("Direction in which the shoots tend to face"))
 362                 .set_is_distance()
 363         );
 364
 365         ret.push_back(ParamDesc("velocity")
 366                 .set_local_name(_("Tangential Velocity"))
 367                 .set_description(_("Amount to which shoots tend to grow along the tangent to the BLine"))
 368         );
 369
 370         ret.push_back(ParamDesc("perp_velocity")
 371                 .set_local_name(_("Perpendicular Velocity"))
 372                 .set_description(_("Amount to which shoots tend to grow perpendicular to the tangent to the BLine"))
 373         );
 374
 375         ret.push_back(ParamDesc("size")
 376                 .set_local_name(_("Stem Size"))
 377                 .set_description(_("Size of the stem"))
 378                 .set_is_distance()
 379         );
 380
 381         ret.push_back(ParamDesc("size_as_alpha")
 382                 .set_local_name(_("Size As Alpha"))
 383                 .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"))
 384         );
 385
 386         ret.push_back(ParamDesc("step")
 387                 .set_local_name(_("Step"))
 388                 .set_description(_("Measure of the distance between points when rendering"))
 389         );
 390
 391         ret.push_back(ParamDesc("seed")
 392                 .set_local_name(_("Seed"))
 393                 .set_description(_("Used to seed the pseudo-random number generator"))
 394         );
 395
 396         ret.push_back(ParamDesc("splits")
 397                 .set_local_name(_("Splits"))
 398                 .set_description(_("Maximum number of times that each sprout can sprout recursively"))
 399         );
 400
 401         ret.push_back(ParamDesc("sprouts")
 402                 .set_local_name(_("Sprouts"))
 403                 .set_description(_("Number of places that growth occurs on each bline section"))
 404         );
 405
 406         ret.push_back(ParamDesc("random_factor")
 407                 .set_local_name(_("Random Factor"))
 408                 .set_description(_("Used to scale down all random effects.  Set to zero to disable randomness"))
 409         );
 410
 411         ret.push_back(ParamDesc("drag")
 412                 .set_local_name(_("Drag"))
 413                 .set_description(_("Drag slows the growth"))
 414         );
 415
 416         return ret;
 417 }
 418
 419 bool
 420 Plant::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
 421 {
 422         bool ret(context.accelerated_render(surface,quality,renddesc,cb));
 423         if(is_disabled() || !ret)
 424                 return ret;
 425
 426         Surface dest_surface;
 427         dest_surface.set_wh(surface->get_w(),surface->get_h());
 428         dest_surface.clear();
 429
 430         const Point     tl(renddesc.get_tl());
 431         const Point br(renddesc.get_br());
 432
 433         const int       w(renddesc.get_w());
 434         const int       h(renddesc.get_h());
 435
 436         const int       surface_width(surface->get_w());
 437         const int       surface_height(surface->get_h());
 438
 439         // Width and Height of a pixel
 440         const Real pw = (br[0] - tl[0]) / w;
 441         const Real ph = (br[1] - tl[1]) / h;
 442
 443         if(needs_sync_==true)
 444                 sync();
 445
 446         std::vector<Particle>::reverse_iterator iter;
 447
 448         float radius(size*sqrt(1.0f/(abs(pw)*abs(ph))));
 449
 450         int x1,y1,x2,y2;
 451         for(iter=particle_list.rbegin();iter!=particle_list.rend();++iter)
 452         {
 453                 float scaled_radius(radius);
 454                 Color color(iter->color);
 455                 if(size_as_alpha)
 456                 {
 457                         scaled_radius*=color.get_a();
 458                         color.set_a(1);
 459                 }
 460
 461                 // previously, radius was multiplied by sqrt(step)*12 only if
 462                 // the radius came out at less than 1 (pixel):
 463                 //   if (radius<=1.0f) radius*=sqrt(step)*12.0f;
 464                 // seems a little arbitrary - does it help?
 465
 466                 // calculate the box that this particle will be drawn as
 467                 float x1f=(iter->point[0]-tl[0])/pw-(scaled_radius*0.5);
 468                 float x2f=(iter->point[0]-tl[0])/pw+(scaled_radius*0.5);
 469                 float y1f=(iter->point[1]-tl[1])/ph-(scaled_radius*0.5);
 470                 float y2f=(iter->point[1]-tl[1])/ph+(scaled_radius*0.5);
 471                 x1=ceil_to_int(x1f);
 472                 x2=ceil_to_int(x2f)-1;
 473                 y1=ceil_to_int(y1f);
 474                 y2=ceil_to_int(y2f)-1;
 475
 476                 // if the box is entirely off the canvas, go to the next particle
 477                 if(x1>surface_width || y1>surface_height || x2<0 || y2<0) continue;
 478
 479                 float x1e=x1-x1f, x2e=x2f-x2, y1e=y1-y1f, y2e=y2f-y2;
 480                 // printf("x1e %.4f x2e %.4f y1e %.4f y2e %.4f\n", x1e, x2e, y1e, y2e);
 481
 482                 // adjust the box so it's entirely on the canvas
 483                 if(x1<=0) { x1=0; x1e=0; }
 484                 if(y1<=0) { y1=0; y1e=0; }
 485                 if(x2>=surface_width)  { x2=surface_width;  x2e=0; }
 486                 if(y2>=surface_height) { y2=surface_height; y2e=0; }
 487
 488                 int w(x2-x1), h(y2-y1);
 489
 490                 Surface::alpha_pen surface_pen(dest_surface.get_pen(x1,y1),1.0f);
 491                 if(w>0 && h>0)
 492                         dest_surface.fill(color,surface_pen,w,h);
 493
 494                 /* the rectangle doesn't cross any vertical pixel boundaries so we don't
 495                  * need to draw any top or bottom edges
 496                  */
 497                 if(x2<x1)
 498                 {
 499                         // case 1 - a single pixel
 500                         if(y2<y1)
 501                         {
 502                                 surface_pen.move_to(x2,y2);
 503                                 surface_pen.set_alpha((x2f-x1f)*(y2f-y1f));
 504                                 surface_pen.put_value(color);
 505                         }
 506                         // case 2 - a single vertical column of pixels
 507                         else
 508                         {
 509                                 surface_pen.move_to(x2,y1-1);
 510                                 if (y1e!=0)     // maybe draw top pixel
 511                                 {
 512                                         surface_pen.set_alpha(y1e*(x2f-x1f));
 513                                         surface_pen.put_value(color);
 514                                 }
 515                                 surface_pen.inc_y();
 516                                 surface_pen.set_alpha(x2f-x1f);
 517                                 for(int i=y1; i<y2; i++) // maybe draw pixels between
 518                                 {
 519                                         surface_pen.put_value(color);
 520                                         surface_pen.inc_y();
 521                                 }
 522                                 if (y2e!=0)     // maybe draw bottom pixel
 523                                 {
 524                                         surface_pen.set_alpha(y2e*(x2f-x1f));
 525                                         surface_pen.put_value(color);
 526                                 }
 527                         }
 528                 }
 529                 else
 530                 {
 531                         // case 3 - a single horizontal row of pixels
 532                         if(y2<y1)
 533                         {
 534                                 surface_pen.move_to(x1-1,y2);
 535                                 if (x1e!=0)     // maybe draw left pixel
 536                                 {
 537                                         surface_pen.set_alpha(x1e*(y2f-y1f));
 538                                         surface_pen.put_value(color);
 539                                 }
 540                                 surface_pen.inc_x();
 541                                 surface_pen.set_alpha(y2f-y1f);
 542                                 for(int i=x1; i<x2; i++) // maybe draw pixels between
 543                                 {
 544                                         surface_pen.put_value(color);
 545                                         surface_pen.inc_x();
 546                                 }
 547                                 if (x2e!=0)     // maybe draw right pixel
 548                                 {
 549                                         surface_pen.set_alpha(x2e*(y2f-y1f));
 550                                         surface_pen.put_value(color);
 551                                 }
 552                         }
 553                         // case 4 - a proper block of pixels
 554                         else
 555                         {
 556                                 if (x1e!=0)     // maybe draw left edge
 557                                 {
 558                                         surface_pen.move_to(x1-1,y1-1);
 559                                         if (y1e!=0)     // maybe draw top left pixel
 560                                         {
 561                                                 surface_pen.set_alpha(x1e*y1e);
 562                                                 surface_pen.put_value(color);
 563                                         }
 564                                         surface_pen.inc_y();
 565                                         surface_pen.set_alpha(x1e);
 566                                         for(int i=y1; i<y2; i++) // maybe draw pixels along the left edge
 567                                         {
 568                                                 surface_pen.put_value(color);
 569                                                 surface_pen.inc_y();
 570                                         }
 571                                         if (y2e!=0)     // maybe draw bottom left pixel
 572                                         {
 573                                                 surface_pen.set_alpha(x1e*y2e);
 574                                                 surface_pen.put_value(color);
 575                                         }
 576                                         surface_pen.inc_x();
 577                                 }
 578                                 else
 579                                         surface_pen.move_to(x1,y2);
 580
 581                                 if (y2e!=0)     // maybe draw bottom edge
 582                                 {
 583                                         surface_pen.set_alpha(y2e);
 584                                         for(int i=x1; i<x2; i++) // maybe draw pixels along the bottom edge
 585                                         {
 586                                                 surface_pen.put_value(color);
 587                                                 surface_pen.inc_x();
 588                                         }
 589                                         if (x2e!=0)     // maybe draw bottom right pixel
 590                                         {
 591                                                 surface_pen.set_alpha(x2e*y2e);
 592                                                 surface_pen.put_value(color);
 593                                         }
 594                                         surface_pen.dec_y();
 595                                 }
 596                                 else
 597                                         surface_pen.move_to(x2,y2-1);
 598
 599                                 if (x2e!=0)     // maybe draw right edge
 600                                 {
 601                                         surface_pen.set_alpha(x2e);
 602                                         for(int i=y1; i<y2; i++) // maybe draw pixels along the right edge
 603                                         {
 604                                                 surface_pen.put_value(color);
 605                                                 surface_pen.dec_y();
 606                                         }
 607                                         if (y1e!=0)     // maybe draw top right pixel
 608                                         {
 609                                                 surface_pen.set_alpha(x2e*y1e);
 610                                                 surface_pen.put_value(color);
 611                                         }
 612                                         surface_pen.dec_x();
 613                                 }
 614                                 else
 615                                         surface_pen.move_to(x2-1,y1-1);
 616
 617                                 if (y1e!=0)     // maybe draw top edge
 618                                 {
 619                                         surface_pen.set_alpha(y1e);
 620                                         for(int i=x1; i<x2; i++) // maybe draw pixels along the top edge
 621                                         {
 622                                                 surface_pen.put_value(color);
 623                                                 surface_pen.dec_x();
 624                                         }
 625                                 }
 626                         }
 627                 }
 628         }
 629
 630         Surface::alpha_pen pen(surface->get_pen(0,0),get_amount(),get_blend_method());
 631         dest_surface.blit_to(pen);
 632
 633         return true;
 634 }
 635
 636 Rect
 637 Plant::get_bounding_rect(Context context)const
 638 {
 639         if(needs_sync_==true)
 640                 sync();
 641
 642         if(is_disabled())
 643                 return Rect::zero();
 644
 645         if(Color::is_onto(get_blend_method()))
 646                 return context.get_full_bounding_rect() & bounding_rect;
 647
 648         //if(get_blend_method()==Color::BLEND_BEHIND)
 649         //      return context.get_full_bounding_rect() | bounding_rect;
 650         return bounding_rect;
 651 }