135 lines
3.2 KiB
Python
135 lines
3.2 KiB
Python
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import math
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from .drawing import Drawing
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def to_degrees(x):
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return math.degrees(x) % 360
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class Turtle(object):
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def __init__(self):
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self.reset()
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def reset(self):
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self.x = 0
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self.y = 0
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self.h = 0
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self.pen = True
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self._path = [(self.x, self.y)]
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self._paths = []
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def clear(self):
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self._path = [(self.x, self.y)]
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self._paths = []
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@property
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def paths(self):
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paths = list(self._paths)
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if len(self._path) > 1:
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paths.append(self._path)
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return paths
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@property
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def drawing(self):
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return Drawing(self.paths)
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def pd(self):
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self.pen = True
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pendown = down = pd
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def pu(self):
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self.pen = False
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if len(self._path) > 1:
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self._paths.append(self._path)
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self._path = [(self.x, self.y)]
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penup = up = pu
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def isdown(self):
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return self.pen
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def goto(self, x, y=None):
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if y is None:
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x, y = x
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if self.pen:
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self._path.append((x, y))
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self.x = x
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self.y = y
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setpos = setposition = goto
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def setx(self, x):
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self.goto(x, self.y)
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def sety(self, x):
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self.goto(self.x, y)
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def seth(self, heading):
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self.h = heading
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setheading = seth
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def home(self):
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self.goto(0, 0)
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self.seth(0)
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def fd(self, distance):
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x = self.x + distance * math.cos(math.radians(self.h))
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y = self.y + distance * math.sin(math.radians(self.h))
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self.goto(x, y)
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forward = fd
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def bk(self, distance):
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x = self.x - distance * math.cos(math.radians(self.h))
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y = self.y - distance * math.sin(math.radians(self.h))
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self.goto(x, y)
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backward = back = bk
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def rt(self, angle):
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self.seth(self.h + angle)
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right = rt
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def lt(self, angle):
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self.seth(self.h - angle)
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left = lt
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def circle(self, radius, extent=None, steps=None):
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if extent is None:
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extent = 360
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if steps is None:
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steps = int(round(abs(2 * math.pi * radius * extent / 360)))
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steps = max(steps, 4)
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cx = self.x + radius * math.cos(math.radians(self.h + 90))
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cy = self.y + radius * math.sin(math.radians(self.h + 90))
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a1 = to_degrees(math.atan2(self.y - cy, self.x - cx))
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a2 = a1 + extent if radius >= 0 else a1 - extent
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for i in range(steps):
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p = i / float(steps - 1)
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a = a1 + (a2 - a1) * p
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x = cx + abs(radius) * math.cos(math.radians(a))
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y = cy + abs(radius) * math.sin(math.radians(a))
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self.goto(x, y)
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if radius >= 0:
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self.seth(self.h + extent)
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else:
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self.seth(self.h - extent)
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def pos(self):
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return (self.x, self.y)
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position = pos
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def towards(self, x, y=None):
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if y is None:
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x, y = x
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return to_degrees(math.atan2(y - self.y, x - self.x))
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def xcor(self):
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return self.x
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def ycor(self):
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return self.y
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def heading(self):
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return self.h
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def distance(self, x, y=None):
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if y is None:
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x, y = x
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return math.hypot(x - self.x, y - self.y)
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