turtle1.py (ex08) added

1ano/fp/aula04/turtle1.py

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