Class Arcball
About :
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=[1, 0, 0, 0]) 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()
Functions
| Function | summury |
|---|---|
| __init__(self, initial=None) | Initialize virtual trackball control. (more…) |
| place(self, center, radius) | Place Arcball, e.g. when window size changes. (more…) |
| setaxes(self, *axes) | Set axes to constrain rotations. (more…) |
| setconstrain(self, constrain) | Set state of constrain to axis mode. (more…) |
| getconstrain(self) | Return state of constrain to axis mode. (more…) |
| down(self, point) | Set initial cursor window coordinates and pick constrain-axis. (more…) |
| drag(self, point) | Update current cursor window coordinates. (more…) |
| next(self, acceleration=0.0) | Continue rotation in direction of last drag. (more…) |
| matrix(self) | Return homogeneous rotation matrix. (more…) |
Methods desciption :
init
def __init__(self, initial=None)
Initialize virtual trackball control.
initial : quaternion or rotation matrix
place
def place(self, center, radius)
Place Arcball, e.g. when window size changes.
center : sequence[2] Window coordinates of trackball center. radius : float Radius of trackball in window coordinates.
setaxes
def setaxes(self, *axes)
Set axes to constrain rotations.
setconstrain
def setconstrain(self, constrain)
Set state of constrain to axis mode.
getconstrain
def getconstrain(self)
Return state of constrain to axis mode.
down
def down(self, point)
Set initial cursor window coordinates and pick constrain-axis.
drag
def drag(self, point)
Update current cursor window coordinates.
next
def next(self, acceleration=0.0)
Continue rotation in direction of last drag.
matrix
def matrix(self)
Return homogeneous rotation matrix.