def Arrow(start=(0.,0.,0.), direction=(1.,0.,0.), tip_length=0.25,
tip_radius=0.1, tip_resolution=20, shaft_radius=0.05,
shaft_resolution=20, scale=None):
"""Create a vtk Arrow.
Parameters
----------
start : np.ndarray
Start location in [x, y, z]
direction : list or tuple or np.ndarray
Direction the arrow points to in [x, y, z]
tip_length : float, optional
Length of the tip.
tip_radius : float, optional
Radius of the tip.
tip_resolution : int, optional
Number of faces around the tip.
shaft_radius : float, optional
Radius of the shaft.
shaft_resolution : int, optional
Number of faces around the shaft.
scale : float or str, optional
Scale factor of the entire object, default is None (i.e. scale of 1).
'auto' scales to length of direction array.
Returns
-------
arrow : pyvista.PolyData
Arrow surface.
"""
# Create arrow object
arrow = _vtk.vtkArrowSource()
arrow.SetTipLength(tip_length)
arrow.SetTipRadius(tip_radius)
arrow.SetTipResolution(tip_resolution)
arrow.SetShaftRadius(shaft_radius)
arrow.SetShaftResolution(shaft_resolution)
arrow.Update()
surf = pyvista.PolyData(arrow.GetOutput())
if scale == 'auto':
scale = float(np.linalg.norm(direction))
if isinstance(scale, float) or isinstance(scale, int):
surf.points *= scale
elif scale is not None:
raise TypeError("Scale must be either float, int or 'auto'.")
translate(surf, start, direction)
return surf
def Arrow(start=(0., 0., 0.),
direction=(1., 0., 0.),
tip_length=0.25,
tip_radius=0.1,
tip_resolution=20,
shaft_radius=0.05,
shaft_resolution=20,
scale=None):
"""Create an arrow.
Parameters
----------
start : iterable, optional
Start location in ``[x, y, z]``.
direction : iterable, optional
Direction the arrow points to in ``[x, y, z]``.
tip_length : float, optional
Length of the tip.
tip_radius : float, optional
Radius of the tip.
tip_resolution : int, optional
Number of faces around the tip.
shaft_radius : float, optional
Radius of the shaft.
shaft_resolution : int, optional
Number of faces around the shaft.
scale : float or str, optional
Scale factor of the entire object, default is ``None``
(i.e. scale of 1). ``'auto'`` scales to length of direction
array.
Returns
-------
pyvista.PolyData
Arrow mesh.
Examples
--------
Plot a default arrow.
>>> import pyvista
>>> mesh = pyvista.Arrow()
>>> mesh.plot(show_edges=True)
"""
# Create arrow object
arrow = _vtk.vtkArrowSource()
arrow.SetTipLength(tip_length)
arrow.SetTipRadius(tip_radius)
arrow.SetTipResolution(tip_resolution)
arrow.SetShaftRadius(shaft_radius)
arrow.SetShaftResolution(shaft_resolution)
arrow.Update()
surf = pyvista.wrap(arrow.GetOutput())
if scale == 'auto':
scale = float(np.linalg.norm(direction))
if isinstance(scale, float) or isinstance(scale, int):
surf.points *= scale
elif scale is not None:
raise TypeError("Scale must be either float, int or 'auto'.")
translate(surf, start, direction)
return surf