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)