pivy.coin(COIN3D)箭头绘制不旋转(FreeCAD-Python)

Question

在我看来，下面的代码是正确的。但不幸的是，我不能旋转箭头。无论我给函数什么角度，它都不起作用。我不知道这个代码出了什么问题。

注：这是我为FreeCAD构建的COIN3D Widget系统的一部分。你可以在我的github=找到整个项目https://github.com/MariwanJ/Design456/tree/devbranch

#draw an arrow 
def draw_arrow(_Points=[], _color=(0,1,0), _ArrSize=1.0,_rotation=(1.0,1.0,1.0,0.0) ):
print("point,arrsize,rota",_Points,_ArrSize,_rotation)
if len (_Points)!=2:
raise ValueError('must be 2 points')
try:
so_separatorRoot=coin.SoSeparator()
so_separatorHead = coin.SoSeparator()
so_separatorTail = coin.SoSeparator()

transHead = coin.SoTranslation()   # decide at which position the object will be placed
transTail = coin.SoTranslation()   # decide at which position the object will be placed
transRoot= coin.SoTranslation()    # decide at which position the whole objects will be placed

coordsRoot = coin.SoTransform()

cone=coin.SoCone()
cone.bottomRadius= 3
cone.height= 3

cylinder=coin.SoCylinder()
cylinder.height = 10
cylinder.radius = 0.5
p1=_Points[0]
p2=App.Vector(p1.x,p1.y-5,p1.z)
styleHead = coin.SoDrawStyle()
styleTail = coin.SoDrawStyle()

styleHead.style = coin.SoDrawStyle.LINES     #draw only frame not filled
styleHead.lineWidth = 3
styleTail.style = coin.SoDrawStyle.LINES     #draw only frame not filled
styleTail.lineWidth = 2

coordsRoot.scaleFactor.setValue([_ArrSize,_ArrSize,_ArrSize])
coordsRoot.translation.setValue(App.Vector(0,0,0))
coordsRoot.rotation.Q=_rotation #  SbRotation (const SbVec3f &axis, const float radians)
transHead.translation.setValue(p1)
transTail.translation.setValue(p2)
transRoot.translation.setValue(App.Vector(0.0,0.0,0.0))

color=coin.SoBaseColor(); 
color.rgb=_color

so_separatorHead.addChild(color)
so_separatorTail.addChild(color)

so_separatorHead.addChild(transHead)
so_separatorTail.addChild(transTail)
so_separatorHead.addChild(styleHead)
so_separatorHead.addChild(cone)

so_separatorTail.addChild(styleTail)
so_separatorTail.addChild(cylinder)

so_separatorRoot.addChild(transRoot)
so_separatorRoot.addChild(color)
so_separatorRoot.addChild(coordsRoot)
so_separatorRoot.addChild(so_separatorHead)
so_separatorRoot.addChild(so_separatorTail)

return so_separatorRoot
except Exception as err:
App.Console.PrintError("'Design456_DirectScale' Failed. "
"{err}n".format(err=str(err)))
exc_type, exc_obj, exc_tb = sys.exc_info()
fname = os.path.split(exc_tb.tb_frame.f_code.co_filename)[1]
print(exc_type, fname, exc_tb.tb_lineno)

Answer 1

我找到了解决方案。事实上，我已经知道了这个问题的答案。看行：coordsRoot.rotation.Q=_rotation # SbRotation (const SbVec3f &axis, const float radians)

这里提到你必须给出四个浮点值。。我的坏。但是Python的问题是。。它不会产生任何错误。这让我的故障排除太难了。没有(.Q(作为(SbRotation(的子对象。我写下正确的代码，以防其他人想使用它。

def draw_arrow(_Points=[], _color=FR_COLOR.FR_OLIVE, _ArrSize=1.0,_rotation=(1.0,1.0,1.0,0.0)):
'''
Draw a 3D arrow at the position given by the _Points and the color given by _color. 
Scale it by the _ArrSize, and rotate it by the _rotation which consist of four float values(x,y,z ,and Angel), angle in radians. 
'''
if len (_Points)!=2:
raise ValueError('Vertices must be 2')
try:
so_separatorRoot=coin.SoSeparator()
so_separatorHead = coin.SoSeparator()
so_separatorTail = coin.SoSeparator()

transHead = coin.SoTranslation()   # decide at which position the object will be placed
transTail = coin.SoTranslation()   # decide at which position the object will be placed
transRoot= coin.SoTranslation()    # decide at which position the whole objects will be placed

coordsRoot = coin.SoTransform()

cone=coin.SoCone()
cone.bottomRadius= 3
cone.height= 3

cylinder=coin.SoCylinder()
cylinder.height = 10
cylinder.radius = 0.5
p1=_Points[0]
p2=App.Vector(p1.x,p1.y-5,p1.z)
styleHead = coin.SoDrawStyle()
styleTail = coin.SoDrawStyle()

styleHead.style = coin.SoDrawStyle.LINES     #draw only frame not filled
styleHead.lineWidth = 3
styleTail.style = coin.SoDrawStyle.LINES     #draw only frame not filled
styleTail.lineWidth = 2

coordsRoot.scaleFactor.setValue([_ArrSize,_ArrSize,_ArrSize])
coordsRoot.translation.setValue(App.Vector(0,0,0))
coordsRoot.rotation.setValue(_rotation) #  SbRotation (const SbVec3f &axis, const float radians)

transHead.translation.setValue(p1)
transTail.translation.setValue(p2)
transRoot.translation.setValue(App.Vector(0.0,0.0,0.0))

color=coin.SoBaseColor(); 
color.rgb=_color

so_separatorHead.addChild(color)
so_separatorTail.addChild(color)

so_separatorHead.addChild(transHead)
so_separatorTail.addChild(transTail)
so_separatorHead.addChild(styleHead)
so_separatorHead.addChild(cone)

so_separatorTail.addChild(styleTail)
so_separatorTail.addChild(cylinder)
print("rotatin",_rotation)
so_separatorRoot.addChild(coordsRoot)       
so_separatorRoot.addChild(transRoot)
so_separatorRoot.addChild(so_separatorHead)
so_separatorRoot.addChild(so_separatorTail)

return so_separatorRoot
# we have a selected object. Try to show the dimensions. 

except Exception as err:
App.Console.PrintError("'Design456_DirectScale' Failed. "
"{err}n".format(err=str(err)))
exc_type, exc_obj, exc_tb = sys.exc_info()
fname = os.path.split(exc_tb.tb_frame.f_code.co_filename)[1]
print(exc_type, fname, exc_tb.tb_lineno)