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# test coordinate system
from wrappers import Turtle
class CoordinatesTurtle(Turtle):
def doTick(self, n):
self.right(90)
self.forward(5)
self.write("%d" % n)
self.back(10)
self.forward(5)
self.left(90)
def draw(canvas):
t = CoordinatesTurtle(canvas)
t.cls
t.plot() # "0, 0" in Logo space, but "windowWidth / 2, windowHeight / 2" in Guido space
# in Guido space (turtle.py from Python standard library)
t.color('green')
for i in range(4):
t.fd(250)
t.doTick(250)
t.fd(250)
t.bk(500)
t.lt(90)
# note that the lines are not perfectly straight above which indicates a truncation or
# rounding bug. since i have yet to mess with the coordinate system or keeping a high-precision
# virtual turtle that is only converted to integer coordinates when drawing i haven't
# traced out the problem
"""
t.plot(10, 10)
t.plot(10, 500)
t.plot(500, 500)
t.plot(500, 10)
"""
t.color('gray')
for i in (10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180):
t.lt(i)
t.fd(i * 2)
#print t._angle
# change this to write on screen, DrawText or something
t.write("%d" % t._angle)
t.bk(i * 2)
t.rt(i)
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