[yt-dev] Issue #1214: vector annotation of off-axis plot generates inconsistent result (yt_analysis/yt)

[Suoqing Ji]

New issue 1214: vector annotation of off-axis plot generates inconsistent result
https://bitbucket.org/yt_analysis/yt/issues/1214/vector-annotation-of-off-axis-plot

Suoqing Ji:

Test dataset is [here](https://dl.dropboxusercontent.com/u/83265784/data.npy)

Test script:

```
#!python

import yt
import numpy as np

dims = (200,200,200)

x = np.load('data.npy')

field1 = x[:,2].reshape(dims, order="F")
field2 = x[:,1].reshape(dims, order="F")
field3 = x[:,0].reshape(dims, order="F")

data = dict(velocity_x = field1,
            velocity_y = field2,
            velocity_z = field3)

bbox = np.array([[-100, 99], [-100, 99], [-100, 99]])

ds = yt.load_uniform_grid(data, dims, 'km', bbox=bbox, nprocs=1)

L = [0, -1, 0]
north_vector = [0, 0, 1]
slc1 = yt.OffAxisSlicePlot(ds, L, 'velocity_x', center=[0,0,0], width=(180,'km'), north_vector=north_vector)
slc1.annotate_velocity(factor=40, normalize=True)
slc1.save()

L = [0, 1, 0] 
north_vector = [0, 0, 1]
slc2 = yt.SlicePlot(ds, L, 'velocity_x', center=[0,0,0], width=(180,'km'), north_vector=north_vector)
slc2.annotate_velocity(factor=40, normalize=True)
slc2.save()
```

On-axis plot:

![UniformGridData_Slice_y_velocity_x.png](https://bitbucket.org/repo/BXbAb/images/3764369440-UniformGridData_Slice_y_velocity_x.png)

Off-axis plot:

![UniformGridData_OffAxisSlice_velocity_x.png](https://bitbucket.org/repo/BXbAb/images/829906186-UniformGridData_OffAxisSlice_velocity_x.png)


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