65 lines
2.0 KiB
Python
65 lines
2.0 KiB
Python
# This program uses the module turtle to draw "turtle graphics"
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# For an introduction and examples, read
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# https://runestone.academy/runestone/static/thinkcspy/PythonTurtle/toctree.html
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# For a summary of the available methods:
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# https://runestone.academy/runestone/books/published/thinkcspy/PythonTurtle/SummaryofTurtleMethods.html
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import turtle # allows us to use the turtles library
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# Make turtle t draw a square with the given side length
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def square(t, side):
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for n in range(4):
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t.forward(side)
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t.left(90)
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# Make turtle t draw a spiral.
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# The first side should have length = start, the second start+incr, etc.,
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# until the length reaches length=end (exclusive).
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def spiral(t, start, end, incr):
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if start < end:
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while start <= end:
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t.forward(start)
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t.left(90)
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start += incr
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else:
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while start >= end:
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t.forward(start)
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t.left(90)
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start += incr
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def main():
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print("This program opens a window with a graphical user interface.")
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wn = turtle.Screen() # creates a graphics window
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alex = turtle.Turtle() # create a turtle named alex
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alex.forward(150) # tell alex to move forward by 150 units
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alex.right(90) # turn by 90 degrees
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alex.forward(75) # complete the second side
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beth = turtle.Turtle() # another turtle
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beth.shape("turtle") # with another shape
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beth.color("blue") # and color
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beth.up() # pen up
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beth.goto(-200, -100) # move to given point
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beth.down() # pen down
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square(beth, 100) # draw a square
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# This should draw a spiral
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alex.up()
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alex.goto(-200, 200)
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alex.setheading(0)
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alex.down()
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spiral(alex, 10, 200, 10)
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alex.up()
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alex.goto(100, 100)
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alex.setheading(0)
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alex.down()
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spiral(alex, 200, 0, -5)
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turtle.exitonclick() # wait for a button click, then close window
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print("The window was closed. Bye!")
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main()
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