1 files changed, 52 insertions, 0 deletions
diff --git a/my_turtle.py b/my_turtle.py
new file mode 100644
index 0000000..db0868a
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+++ b/my_turtle.py
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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)