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Sem2-ActiveCode_strings_lys2.py
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Sem2-ActiveCode_strings_lys2.py
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"""
Esse é o programa completo em activecode. A função main primeiro cria o string do sistema-L e então cria a tartaruga e passa a tartaruga e o string para a função de desenho.
"""
import turtle
def createLSystem(numIters,axiom):
startString = axiom
endString = ""
for i in range(numIters):
endString = processString(startString)
startString = endString
return endString
def processString(oldStr):
newstr = ""
for ch in oldStr:
newstr = newstr + applyRules(ch)
return newstr
def applyRules(ch):
newstr = ""
if ch == 'F':
newstr = 'F-F++F-F' # Rule 1
else:
newstr = ch # no rules apply so keep the character
return newstr
def drawLsystem(aTurtle,instructions,angle,distance):
for cmd in instructions:
if cmd == 'F':
aTurtle.forward(distance)
elif cmd == 'B':
aTurtle.backward(distance)
elif cmd == '+':
aTurtle.right(angle)
elif cmd == '-':
aTurtle.left(angle)
else:
print('Error:', cmd, 'is an unknown command')
def main():
inst = createLSystem(4,"F") #create the string
print(inst)
t = turtle.Turtle() #create the turtle
wn = turtle.Screen()
t.up()
t.back(200)
t.down()
t.speed(9)
drawLsystem(t,inst,60,5) #draw the picture
#angle 60, segment length 5
wn.exitonclick()
main()