.

bac1/q1/04oct/ex6.py

@@ -0,0 +1,40 @@
+from uturtle import (
+    umonsTurtle, wait,
+    moveForward, moveBackward,
+    turnLeft, turnRight,
+    dropPen, usePen)
+
+
+def arbre(t, x, a, n):
+    """draw a tree
+
+    :t: turtle
+    :x: taille du tronc de base
+    :a: angle des branches
+    :n: profondeur de l'arbre
+    """
+    moveForward(t, x)
+    arbre_rec(t, x, a, n)
+
+
+def arbre_rec(t, x, a, n):
+    if n == 0:
+        return
+    turnLeft(t, a/2)
+    moveForward(t, x)
+    arbre_rec(t, x*5/6, a*5/6, n-1)
+    moveBackward(t, x)
+
+    turnRight(t, a)
+    moveForward(t, x)
+    arbre_rec(t, x*5/6, a*5/6, n-1)
+    moveBackward(t, x)
+
+    turnLeft(t, a/2)
+
+
+if __name__ == "__main__":
+    turtle = umonsTurtle()
+    turnLeft(turtle)
+    arbre(turtle, 50, 45, 4)
+    wait()