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Fix vector directions when overlaid on image #2276

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Fix vector directions when overlaid on image #2276

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12 changes: 12 additions & 0 deletions glue/viewers/scatter/layer_artist.py
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Original file line number Diff line number Diff line change
Expand Up @@ -277,6 +277,18 @@ def _update_data(self):
vx = ensure_numerical(self.layer[self.state.vx_att].ravel())
vy = ensure_numerical(self.layer[self.state.vy_att].ravel())

# If this is being overlaid on an image viewer with a WCS,
# we need to check the relative orientations of the pixel/world axes
if getattr(self.axes, 'wcs', None) is not None:
cdelt = self.axes.wcs.wcs.get_cdelt()
ndim = self._viewer_state.reference_data.ndim
x_index = ndim - self._viewer_state.x_att.axis - 1
y_index = ndim - self._viewer_state.y_att.axis - 1
if cdelt[x_index] < 0:
vx = np.negative(vx)
if cdelt[y_index] < 0:
vy = np.negative(vy)

if self.state.vector_mode == 'Polar':
ang = vx
length = vy
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