當我旋轉身體時，鼠標身體的形狀不會旋轉

Question

在鼠標中，當我旋轉身體時，其形狀不旋轉。當我施加衝動時，形狀與預期一致地移動。我的谷歌搜索表明，身體旋轉時身體的形狀應該旋轉。我從根本上誤解輪換？

下面是相關輪換代碼：

def selectEntity(self, location): 
    shapes = self.space.point_query(location) 
    bodies = set() 
    for shape in shapes: 
     bodies.add(shape.body) 
    for body in bodies: 
     body.angle += 1.57079633 # + 90 degrees 

這裏是初始化代碼：

def _addShip(self, mass, center, angle = 0.): 
    radius = 10 

    groupId = self.getNextBodyId() # shapes in the same group do not generate collisions 
    body = pymunk.Body(mass, pymunk.moment_for_circle(mass, radius/10, radius)) # mass, inner radius, outer radius, offset 
    body.angle = angle 

    partOne = pymunk.Circle(body, radius, center) 
    partOne.group = groupId 
    partOne.color = THECOLORS['blue'] 
    partOne.friction = .8 

    partTwo = pymunk.Circle(body, radius, (center[0], center[1] + 20)) 
    partTwo.group = groupId 
    partTwo.color = THECOLORS['blue'] 
    partTwo.friction = .8 

    ship = (partOne, partTwo, body) 
    self.space.add(*ship) 

Answer 1

碰撞樹/哈希並不會立即更新，您需要先向前邁進了一步的空間。另一種更新碰撞數據的方法是調用Space.reindex_shape（shape_that_has_been_moved）。

參見本實施例：

>>> from pymunk import * 
>>> s = Space() 
>>> b = Body(1,1) 
>>> c1 = Circle(b, 10, (-10,0)) 
>>> c2 = Circle(b, 10, (10,0)) 
>>> s.add(b,c1,c2) 
>>> s.step(.1) 
>>> s.point_query((-15,0)) 
[<pymunk.Circle object at 0x02264690>] 
>>> b.angle 
0.0 
>>> b.angle = 1.57 
>>> s.point_query((-15,0)) 
[<pymunk.Circle object at 0x02264690>] 
>>> s.step(.1) 
>>> s.point_query((-15,0)) 
[] 
>>> s.point_query((0,-15)) 
[<pymunk.Circle object at 0x02264690>] 
>>> b.angle = 0 
>>> s.point_query((-15,0)) 
[] 
>>> s.reindex_shape(c1) 
>>> s.reindex_shape(c2) 
>>> s.point_query((-15,0)) 
[<pymunk.Circle object at 0x02264690>]