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from vector import Vector
from misc.angles import deg_to_rad, rad_to_deg
# Size of the turtle canvas. We assume no user will have a screen
# so big that the canvas will be bigger than this.
BITMAP_SIZE = Vector((2000,1200))
# Center of the canvas.
origin = BITMAP_SIZE / 2.0
# 4 lambda functions for transforming between the reference frame
# that we prefer and the reference frame that wxPython prefers:
to_my_angle = lambda angle: rad_to_deg(-angle)-180
from_my_angle = lambda angle: deg_to_rad(-angle+180)
from_my_pos = lambda pos: -pos+origin
to_my_pos = lambda pos: -pos+origin
##############
class Turtle(object):
"""
A Turtle object defines a turtle by its attributes, such as
position, orientation, color, etc. See source of __init__ for
a complete list.
"""
def __init__(self):
self.pos = Vector((0,0))
self.orientation = 180
self.color = "red"
self.rgb_color = (255, 0, 0)
self.width = 3
self.visible = True
self.pen_down = True
# the `clear` attribute is only made True momentarily when
# the `clear()` function is called by the user to clear the screen.
self.clear = False
self.SPEED=400.0 # Pixels per second
self.ANGULAR_SPEED=360.0 # Degrees per second
def give_pen(self):
"""
Gives a wxPython pen that corresponds to the color, width,
and pen_downity of the Turtle instance.
"""
return wx.Pen(self.color,self.width,wx.SOLID if self.pen_down else wx.TRANSPARENT)
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