/*Inspirtaion*/
import Lsystem;
size(10cm,10cm);
settings.outformat="pdf"; // for opacity

string[][] rules=new string[][]{{"F", "FF"},{"X", "F-[[X]+X]+F[+FX]-X"}};
Lsystem plant=Lsystem("X", rules, La=22.5, Lai=90);
plant.iterate(8);
path[] g=plant.paths();

tree g=plant.tree();

for (int i:g.keys) {
  if((g[i].depth <= 2 )) draw(g[i].g, yellow);
}

for (int i:g.keys) {
  if((g[i].depth > 2 ) && (g[i].depth <= 10 )) draw(g[i].g, green+opacity(0.5));
}

for (int i:g.keys) {
  if((g[i].depth > 11)) draw(g[i].g, brown+opacity(0.3));
}

shipout(bbox(Fill(paleyellow)));

    
/*Inspirtaion*/
import Lsystem;
size(10cm,10cm);
settings.outformat="pdf"; // for opacity

string[][] rules=new string[][]{{"F", "FF-[-F+F+F]+[+F-F-F]"}};
Lsystem plant=Lsystem("F", rules, La=22.5, Lai=90);
plant.iterate(5);
path[] g=plant.paths();

tree g=plant.tree();

for (int i:g.keys) {
  if((g[i].depth == 0)) draw(g[i].g, yellow);
}

for (int i:g.keys) {
  if((g[i].depth > 0 )) draw(g[i].g, green+opacity(0.5));
}

for (int i:g.keys) {
  if((g[i].depth > 15)) draw(g[i].g, brown+opacity(0.3));
}

shipout(bbox(Fill(paleyellow)));

    
/* Source */
import Lsystem;
size(8cm,0);

string[][] rules={
  {"A", "X+X+X+X+X+X+"},
  {"X", "[F+F+F+F[---X-Y]+++++F++++++++F-F-F-F]"},
  {"Y", "[F+F+F+F[---Y]+++++F++++++++F-F-F-F]"}
};

Lsystem spiral=Lsystem("AAAA",rules,La=15);

spiral.iterate(6);
draw(spiral.paths(), 0.9*green);

shipout(bbox(2mm, Fill(black)));

    
import Lsystem;
size(10cm,0);

string[][] rules={
  {"F", ""},
  {"P", "--FR++++FS--FU"},
  {"Q", "FT++FR----FS++"},
  {"R", "++FP----FQ++FT"},
  {"S", "FU--FP++++FQ--"},
  {"T", "+FU--FP+"},
  {"U", "-FQ++FT-"}
};

Lsystem pentive=Lsystem("Q", rules, La=36, Lai=180);

pentive.iterate(8);
draw(pentive.paths(), 0.8*yellow);
shipout(bbox(2mm, Fill(black)));

    
/* Source */
import Lsystem;
size(8cm,0);

string[][] rules={
  {"F", "F+f-FF+F+FF+Ff+FF-f+FF-F-FF-Ff-FFF"},
  {"f", "ffffff"}
};

Lsystem oer=Lsystem("F+F+F+F",rules,La=91);

oer.iterate(2);
draw(oer.paths(), bp+0.8*yellow);
shipout(bbox(2mm, Fill(black)));

    
import Lsystem;
size(8cm,0);

string[][] rules={{"L","+R-F-R+"}, {"R","-L+F+L-"}};
Lsystem squareCurve= Lsystem("L--F--L--F", rules, La=45, Lai=45);
squareCurve.iterate(9);
filldraw(squareCurve.paths()[0]&cycle, grey, 1bp+0.9*yellow);

shipout(bbox(3mm, Fill(black)));

    
import Lsystem;
size(8cm,0);

string[][] rules={{"X","XF-F+F-XF+F+XF-F+F-X"}};
Lsystem squareCurve= Lsystem("F+XF+F+XF", rules, La=90, Lai=45);
squareCurve.iterate(5);
filldraw(squareCurve.paths()[0]&cycle, grey, 1bp+0.9*yellow);
shipout(bbox(3mm, Fill(black)));