import wx

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.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)