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

问题描述

在我看来，下面的代码是正确的。但不幸的是我无法旋转箭头。无论我赋予该功能什么角度，它都不起作用。 我不知道这段代码有什么问题。

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

#draw an arrow 
def draw_arrow(_Points=[],_color=(0,1,0),_ArrSize=1.0,_rotation=(1.0,1.0,0.0) ):
    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])
        coordsRoot.translation.setValue(App.Vector(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)

解决方法

我找到了解决方案。其实我在问题中已经有了答案。 看看这行： coordsRoot.rotation.Q=_rotation # SbRotation (const SbVec3f &axis,const float radians)

那里提到你必须给出四个浮点值..我的错。但是 Python 的问题是 .. 它不会产生任何错误。这使我的故障排除太困难了。 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=(1.0,1.0,0.0)):
    '''
    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))
        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)