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模块 mbcp.mp_math.line
本模块定义了三维空间中的直线类
class Line3
method __init__(self, point: Point3, direction: Vector3)
说明 : 三维空间中的直线。由一个点和一个方向向量确定。
参数 :
源代码 或 在GitHub上查看 python def __init__ (self, point: 'Point3' , direction: 'Vector3' ): \n self .point = point \n self .direction = direction
method approx(self, other: Line3, epsilon: float = APPROX) -> bool
说明 : 判断两条直线是否近似相等。
参数 :
返回 : bool
: 是否近似相等
源代码 或 在GitHub上查看 python def approx (self, other: 'Line3' , epsilon: float = APPROX ) -> bool : \n return self .is_approx_parallel(other, epsilon) and ( self .point - other.point).is_approx_parallel( self .direction, epsilon)
method cal_angle(self, other: Line3) -> AnyAngle
说明 : 计算直线和直线之间的夹角。
参数 :
返回 : AnyAngle
: 夹角
源代码 或 在GitHub上查看 python def cal_angle (self, other: 'Line3' ) -> 'AnyAngle' : \n return self .direction.cal_angle(other.direction)
method cal_distance(self, other: Line3 | Point3) -> float
说明 : 计算直线和直线或点之间的距离。
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返回 : float
: 距离
引发 :
源代码 或 在GitHub上查看 python def cal_distance (self, other: 'Line3 | Point3' ) -> float :
if isinstance (other, Line3):
if self == other:
return 0
elif self .is_parallel(other):
return (other.point - self .point).cross( self .direction).length / self .direction.length
elif not self .is_coplanar(other):
return abs ( self .direction.cross(other.direction) @ ( self .point - other.point) / self .direction.cross(other.direction).length)
else :
return 0
elif isinstance (other, Point3):
return (other - self .point).cross( self .direction).length / self .direction.length
else :
raise TypeError ( 'Unsupported type.' )
method cal_intersection(self, other: Line3) -> Point3
说明 : 计算两条直线的交点。
参数 :
返回 : Point3
: 交点
引发 :
源代码 或 在GitHub上查看 python def cal_intersection (self, other: 'Line3' ) -> 'Point3' :
if self .is_parallel(other):
raise ValueError ( 'Lines are parallel and do not intersect.' )
if not self .is_coplanar(other):
raise ValueError ( 'Lines are not coplanar and do not intersect.' )
return self .point + self .direction.cross(other.direction) @ other.direction.cross( self .point - other.point) / self .direction.cross(other.direction).length ** 2 * self .direction
method cal_perpendicular(self, point: Point3) -> Line3
说明 : 计算直线经过指定点p的垂线。
参数 :
返回 : Line3
: 垂线
源代码 或 在GitHub上查看 python def cal_perpendicular (self, point: 'Point3' ) -> 'Line3' :
return Line3(point, self .direction.cross(point - self .point))
method get_point(self, t: RealNumber) -> Point3
说明 : 获取直线上的点。同一条直线,但起始点和方向向量不同,则同一个t对应的点不同。
参数 :
返回 : Point3
: 点
源代码 或 在GitHub上查看 python def get_point (self, t: RealNumber) -> 'Point3' :
return self .point + t * self .direction
method get_parametric_equations(self) -> tuple[OneSingleVarFunc, OneSingleVarFunc, OneSingleVarFunc]
说明 : 获取直线的参数方程。
返回 : tuple
[OneSingleVarFunc
, OneSingleVarFunc
, OneSingleVarFunc
]: 参数方程
源代码 或 在GitHub上查看 python def get_parametric_equations (self) -> tuple[OneSingleVarFunc, OneSingleVarFunc, OneSingleVarFunc]:
return ( lambda t: self .point.x + self .direction.x * t, lambda t: self .point.y + self .direction.y * t, lambda t: self .point.z + self .direction.z * t)
method is_approx_parallel(self, other: Line3, epsilon: float = 1e-06) -> bool
说明 : 判断两条直线是否近似平行。
参数 :
返回 : bool
: 是否近似平行
源代码 或 在GitHub上查看 python def is_approx_parallel (self, other: 'Line3' , epsilon: float = 1e-06 ) -> bool :
return self .direction.is_approx_parallel(other.direction, epsilon)
method is_parallel(self, other: Line3) -> bool
说明 : 判断两条直线是否平行。
参数 :
返回 : bool
: 是否平行
源代码 或 在GitHub上查看 python def is_parallel (self, other: 'Line3' ) -> bool :
return self .direction.is_parallel(other.direction)
method is_collinear(self, other: Line3) -> bool
说明 : 判断两条直线是否共线。
参数 :
返回 : bool
: 是否共线
源代码 或 在GitHub上查看 python def is_collinear (self, other: 'Line3' ) -> bool :
return self .is_parallel(other) and ( self .point - other.point).is_parallel( self .direction)
method is_point_on(self, point: Point3) -> bool
说明 : 判断点是否在直线上。
参数 :
返回 : bool
: 是否在直线上
源代码 或 在GitHub上查看 python def is_point_on (self, point: 'Point3' ) -> bool :
return (point - self .point).is_parallel( self .direction)
method is_coplanar(self, other: Line3) -> bool
说明 : 判断两条直线是否共面。 充要条件:两直线方向向量的叉乘与两直线上任意一点的向量的点积为0。
参数 :
返回 : bool
: 是否共面
源代码 或 在GitHub上查看 python def is_coplanar (self, other: 'Line3' ) -> bool :
return self .direction.cross(other.direction) @ ( self .point - other.point) == 0
method simplify(self)
说明 : 简化直线方程,等价相等。 自体简化,不返回值。
按照可行性一次对x y z 化 0 处理,并对向量单位化
源代码 或 在GitHub上查看 python def simplify (self):
self .direction.normalize()
if self .direction.x == 0 :
self .point.x = 0
if self .direction.y == 0 :
self .point.y = 0
if self .direction.z == 0 :
self .point.z = 0
@classmethod
method from_two_points(cls, p1: Point3, p2: Point3) -> Line3
说明 : 工厂函数 由两点构造直线。
参数 :
返回 : Line3
: 直线
源代码 或 在GitHub上查看 python @ classmethod
def from_two_points (cls, p1: 'Point3' , p2: 'Point3' ) -> 'Line3' :
direction = p2 - p1
return cls (p1, direction)
method self & other: Line3 => Line3 | Point3 | None
说明 : 计算两条直线点集合的交集。重合线返回自身,平行线返回None,交线返回交点。
参数 :
返回 : Line3
| Point3
| None
: 交集
源代码 或 在GitHub上查看 python def __and__ (self, other: 'Line3' ) -> 'Line3 | Point3 | None' :
if self .is_collinear(other):
return self
elif self .is_parallel(other) or not self .is_coplanar(other):
return None
else :
return self .cal_intersection(other)
method self == other => bool
说明 : 判断两条直线是否等价。
v1 // v2 ∧ (p1 - p2) // v1
参数 :
返回 : bool
: 是否等价
源代码 或 在GitHub上查看 python def __eq__ (self, other) -> bool :
return self .direction.is_parallel(other.direction) and ( self .point - other.point).is_parallel( self .direction)
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