Class Arcball
source code
object --+
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Arcball
Virtual Trackball Control.
>>> ball = Arcball()
>>> ball = Arcball(initial=numpy.identity(4))
>>> ball.place([320, 320], 320)
>>> ball.down([500, 250])
>>> ball.drag([475, 275])
>>> R = ball.matrix()
>>> numpy.allclose(numpy.sum(R), 3.90583455)
True
>>> ball = Arcball(initial=[0, 0, 0, 1])
>>> ball.place([320, 320], 320)
>>> ball.setaxes([1,1,0], [-1, 1, 0])
>>> ball.setconstrain(True)
>>> ball.down([400, 200])
>>> ball.drag([200, 400])
>>> R = ball.matrix()
>>> numpy.allclose(numpy.sum(R), 0.2055924)
True
>>> ball.next()
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place(self,
center,
radius)
Place Arcball, e.g. when window size changes. |
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setaxes(self,
*axes)
Set axes to constrain rotations. |
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setconstrain(self,
constrain)
Set state of constrain to axis mode. |
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getconstrain(self)
Return state of constrain to axis mode. |
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down(self,
point)
Set initial cursor window coordinates and pick constrain-axis. |
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drag(self,
point)
Update current cursor window coordinates. |
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next(self,
acceleration=0.0)
Continue rotation in direction of last drag. |
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matrix(self)
Return homogeneous rotation matrix. |
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Inherited from object:
__delattr__,
__format__,
__getattribute__,
__hash__,
__new__,
__reduce__,
__reduce_ex__,
__repr__,
__setattr__,
__sizeof__,
__str__,
__subclasshook__
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Inherited from object:
__class__
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Initialize virtual trackball control.
initial : quaternion or rotation matrix
- Overrides:
object.__init__
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Place Arcball, e.g. when window size changes.
- center : sequence[2]
- Window coordinates of trackball center.
- radius : float
- Radius of trackball in window coordinates.
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