def __init__(self, **kwargs):
Coordinate.__init__(self, **kwargs)
#半径
self.radius = kwargs['radius']
#角度
self.angle = kwargs.get('angle', 90.0)
#圆心
self.center = (0, 0)
x = Geometry.sin(self.angle / 2) * self.radius
y = Geometry.cos(self.angle / 2) * self.radius
self.source = x, y
self.target = -x, y
#外切圆心，外切半径
if self.angle < 90: #三点求圆
self.wrap_center = Geometry.circle_center(self.source, self.target, self.center)
self.wrap_radius = Geometry.distance(self.wrap_center, self.center)
elif self.angle < 180: #两侧点中点
self.wrap_center = (0, y)
self.wrap_radius = x
else: #所在的圆
self.wrap_center = self.center
self.wrap_radius = self.radius
def __init__(self, **kwargs): Coordinate.__init__(self, **kwargs) Motion.__init__(self, **kwargs) #长度 self.length = kwargs['length'] middle = kwargs['middle'] #中间点，middle=0为圆 self.middle = (middle, self.length / 2) #源点 self.source = (0, 0) #目标点 if middle: self.target = (0, self.length) else: self.target = self.source #圆弧的圆心 if middle: self.center = Geometry.circle_center(self.source, self.target, self.middle) else: self.center = self.middle #半径 self.radius = Geometry.distance(self.source, self.center) #角度 center_x, center_y = self.center if middle > 0: self.angle = 360 - 2 * Geometry.acos(center_x / self.radius) elif middle < 0: self.angle = 2 * Geometry.acos(center_x / self.radius) else: self.angle = 360 #距离 self.distance = Geometry.radian(self.angle) * self.radius #上一个点 self.last_step = self.source