mystery turtle functions
#After you have worked out on paper what mystery1 through mystery4 do
#Run the test program to find out. Type
# >>>test()
# in the command area. This function creates a new world and turtle each
# time, so none of the mystery functions affect each other.
#
# Supplementary question for understanding (1):
# Say you create a world and a turtle called elliott in it,
# what would the following draw?
# >>>mystery1(elliott)
# >>>mystery2(elliott)
# >>>mystery3(elliott)
# >>>mystery4(elliott)
# Remember that now the finishing location and orientation of elliott in one function
# affects where he goes subsequently.
#
# Supplementary question for understanding (2):
# There is a double vertical line when you do this, even though there should be two lines
# in the same place. Why are they displaced horizontally when they shouldn't be?
# Hint: turtle locations are always integers. Where does going forward a fixed number of
# pixels take a turtle if it is moving in diagonally?
def mystery1(turtle):
for i in range(4):
turtle.forward(100)
turtle.turnRight()
def mystery2(turtle):
for i in range(3):
turtle.forward(100)
turtle.turnRight()
def mystery3(turtle):
for i in range(3):
turtle.forward(100)
turtle.turn(120)
def mystery4(turtle):
turtle.turnRight()
for i in range(3):
turtle.forward(100)
turtle.turn(120)
# Demonstration program.
# Executes mystery1 through mystery4 five seconds apart.
def test():
import time
for i in range(1, 5):
world = makeWorld()
t = makeTurtle(world)
if i == 1:
mystery1(t)
elif i == 2:
mystery2(t)
elif i == 3:
mystery3(t)
else:
mystery4(t)
time.sleep(5.0)
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