def contour_to_roi(x, y, data):
"""
Return a PolygonalROI for the contour that passes through (x,y) in data
Parameters
----------
x, y : float
x and y coordinate of the point
data : `numpy.ndarray`
The data
Returns
-------
:class:`~glue.core.roi.PolygonalROI`
A new ROI made by the (single) contour that passes through the
mouse location (and `None` if this could not be calculated)
"""
if x is None or y is None:
return None
xy = point_contour(x, y, data)
if xy is None:
return None
p = roi.PolygonalROI(vx=xy[:, 0], vy=xy[:, 1])
return p
def ginga_graphic_to_roi(obj):
if obj.kind == 'rectangle':
# make sure x2, y2 are the upper right corner
x1, y1, x2, y2 = obj.swapxy(obj.x1, obj.y1, obj.x2, obj.y2)
roi = roimod.RectangularROI(xmin=x1, xmax=x2, ymin=y1, ymax=y2)
elif obj.kind == 'circle':
roi = roimod.CircularROI(xc=obj.x, yc=obj.y, radius=obj.radius)
elif obj.kind in ('polygon', 'freepolygon'):
vx, vy = zip(*obj.points)
roi = roimod.PolygonalROI(vx=vx, vy=vy)
elif obj.kind in ('path', 'freepath', 'line'):
vx, vy = zip(*obj.points)
roi = roimod.Path(vx=vx, vy=vy)
elif obj.kind == 'xrange':
x1, y1, x2, y2 = obj.swapxy(obj.x1, 0, obj.x2, 0)
roi = roimod.XRangeROI(min=x1, max=x2)
elif obj.kind == 'yrange':
x1, y1, x2, y2 = obj.swapxy(0, obj.y1, 0, obj.y2)
roi = roimod.YRangeROI(min=y1, max=y2)
elif obj.kind == 'point':
roi = roimod.PointROI(x=obj.x, y=obj.y)
else:
raise Exception("Don't know how to convert shape '%s' to a ROI" %
(obj.kind))
return roi
def ginga_graphic_to_roi(obj):
if obj.kind == 'rectangle':
roi = roimod.RectangularROI(xmin=obj.x1,
xmax=obj.x2,
ymin=obj.y1,
ymax=obj.y2)
elif obj.kind == 'circle':
roi = roimod.CircularROI(xc=obj.x, yc=obj.y, radius=obj.radius)
elif obj.kind == 'polygon':
vx = map(lambda xy: xy[0], obj.points)
vy = map(lambda xy: xy[1], obj.points)
roi = roimod.PolygonalROI(vx=vx, vy=vy)
else:
raise Exception("Don't know how to convert shape '%s' to a ROI" %
(obj.kind))
return roi