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# example based on article in BYTE magazine
# Problem Solving with Logo: Using Turtle Graphics to Redraw a Design
# November 1982
# p. 118 - 134
from wrappers import Turtle
class ByteTurtle(Turtle):
def design(self, homePos, scale):
self.pu()
for i in range(5):
self.fd(64.65 * scale)
self.pd()
self.wheel(self.getXY(), scale)
self.pu()
self.bk(64.65 * scale)
self.rt(72)
self.pu(); self.setXY(homePos); self.rt(36); self.fd(24.5 * scale); self.rt(198); self.pd()
self.centerpiece(46 * scale, 143.4, scale)
def wheel(self, initpos, scale):
self.rt(54)
for i in range(4): self.pentpiece(initpos, scale)
self.pd(); self.lt(36)
for i in range(5): self.tripiece(initpos, scale)
self.lt(36)
for i in range(5):
self.pd()
self.rt(72)
self.fd(28 * scale)
self.pu()
self.bk(28 * scale)
self.lt(54)
def tripiece(self, initpos, scale):
oldh = self.getHeading()
self.pd(); self.bk(2.5 * scale)
self.tripolyr(31.5 * scale, scale)
self.pu(); self.setXY(initpos); self.setHeading(oldh)
self.pd(); self.bk(2.5 * scale)
self.tripolyl(31.5 * scale, scale)
self.pu(); self.setXY(initpos); self.setHeading(oldh)
self.lt(72)
def pentpiece(self, initpos, scale):
oldh = self.getHeading()
self.pu(); self.fd(29 * scale); self.pd()
for i in range(5):
self.fd(18 * scale)
self.rt(72)
self.pentr(18 * scale, 75, scale)
self.pu(); self.setXY(initpos); self.setHeading(oldh)
self.fd(29 * scale); self.pd()
for i in range(5):
self.fd(18 * scale)
self.rt(72)
self.pentl(18 * scale, 75, scale)
self.pu(); self.setXY(initpos); self.setHeading(oldh)
self.lt(72)
def pentl(self, side, ang, scale):
if side < (2 * scale): return
self.fd(side)
self.lt(ang)
self.pentl(side - (.38 * scale), ang, scale)
def pentr(self, side, ang, scale):
if side < (2 * scale): return
self.fd(side)
self.rt(ang)
self.pentr(side - (.38 * scale), ang, scale)
def tripolyr(self, side, scale):
if side < (4 * scale): return
self.fd(side)
self.rt(111)
self.fd(side / 1.78)
self.rt(111)
self.fd(side / 1.3)
self.rt(146)
self.tripolyr(side * .75, scale)
def tripolyl(self, side, scale):
if side < (4 * scale): return
self.fd(side)
self.lt(111)
self.fd(side / 1.78)
self.lt(111)
self.fd(side / 1.3)
self.lt(146)
self.tripolyl(side * .75, scale)
def centerpiece(self, s, a, scale):
self.fd(s); self.lt(a)
if s < (7.5 * scale): return
self.centerpiece(s - (1.2 * scale), a, scale)
def draw(canvas):
t = ByteTurtle(canvas)
t.cls()
"""
t.pu()
t.lt(90)
t.fd(30)
t.rt(90)
t.pd()
"""
t.design(t.getXY(), 2.3)
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