/usr/lib/python2.7/dist-packages/ginga/canvas/coordmap.py is in python-ginga 2.6.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# coordmap.py -- coordinate mappings.
#
# This is open-source software licensed under a BSD license.
# Please see the file LICENSE.txt for details.
#
from ginga import trcalc
from ginga.util import wcs
from ginga.util.six.moves import map
__all__ = ['CanvasMapper', 'CartesianMapper', 'DataMapper', 'OffsetMapper',
'WCSMapper']
class CoordMapError(Exception):
pass
class BaseMapper(object):
"""Base class for coordinate mapper objects."""
def __init__(self):
super(BaseMapper, self).__init__()
def to_canvas(self, canvas_x, canvas_y):
raise CoordMapError("this method is deprecated")
def to_data(self, canvas_x, canvas_y):
raise CoordMapError("subclass should override this method")
def data_to(self, data_x, data_y):
raise CoordMapError("subclass should override this method")
def offset_pt(self, pt, xoff, yoff):
"""
Offset a point specified by `pt`, by the offsets (`xoff`, `yoff`).
Coordinates are assumed to be in the space defined by this mapper.
"""
raise CoordMapError("subclass should override this method")
def rotate_pt(self, x, y, theta, xoff=0, yoff=0):
"""
Rotate a point specified by (`x`, `y`) by the angle `theta` (in degrees)
around the point indicated by (`xoff`, `yoff`).
Coordinates are assumed to be in the space defined by this mapper.
"""
raise CoordMapError("subclass should override this method")
class CanvasMapper(BaseMapper):
"""A coordinate mapper that maps to the viewer's canvas in
canvas coordinates.
"""
def __init__(self, viewer):
super(CanvasMapper, self).__init__()
self.viewer = viewer
def to_data(self, canvas_x, canvas_y, viewer=None):
if viewer is None:
viewer = self.viewer
canvas_x, canvas_y = viewer.tform['canvas_to_window'].from_(canvas_x,
canvas_y)
# flip Y axis for certain backends
return viewer.tform['data_to_window'].from_(canvas_x, canvas_y)
def data_to(self, data_x, data_y, viewer=None):
if viewer is None:
viewer = self.viewer
canvas_x, canvas_y = viewer.tform['data_to_window'].to_(data_x,
data_y)
# flip Y axis for certain backends
return viewer.tform['canvas_to_window'].to_(canvas_x, canvas_y)
def offset_pt(self, pt, xoff, yoff):
x, y = pt
return x + xoff, y + yoff
def rotate_pt(self, x, y, theta, xoff=0, yoff=0):
# TODO? Not sure if it is needed with this mapper type
return x, y
class CartesianMapper(BaseMapper):
"""A coordinate mapper that maps to the viewer's canvas
in Cartesian coordinates that do not scale (unlike DataMapper).
"""
def __init__(self, viewer):
super(CartesianMapper, self).__init__()
self.viewer = viewer
def to_data(self, crt_x, crt_y, viewer=None):
if viewer is None:
viewer = self.viewer
return viewer.tform['data_to_cartesian'].from_(crt_x, crt_y)
def data_to(self, data_x, data_y, viewer=None):
if viewer is None:
viewer = self.viewer
return viewer.tform['data_to_cartesian'].to_(data_x, data_y)
def offset_pt(self, pt, xoff, yoff):
x, y = pt
return x + xoff, y + yoff
def rotate_pt(self, x, y, theta, xoff=0, yoff=0):
return trcalc.rotate_pt(x, y, theta, xoff=xoff, yoff=yoff)
class DataMapper(BaseMapper):
"""A coordinate mapper that maps to the viewer's canvas
in data coordinates.
"""
def __init__(self, viewer):
super(DataMapper, self).__init__()
self.viewer = viewer
def to_data(self, data_x, data_y, viewer=None):
return data_x, data_y
def data_to(self, data_x, data_y, viewer=None):
return data_x, data_y
def offset_pt(self, pt, xoff, yoff):
x, y = pt
return x + xoff, y + yoff
def rotate_pt(self, x, y, theta, xoff=0, yoff=0):
return trcalc.rotate_pt(x, y, theta, xoff=xoff, yoff=yoff)
class OffsetMapper(BaseMapper):
"""A coordinate mapper that maps to the viewer's canvas
in data coordinates that are offsets relative to some other
reference object.
"""
def __init__(self, viewer, refobj):
super(OffsetMapper, self).__init__()
# TODO: provide a keyword arg to specify which point in the obj
self.viewer = viewer
self.refobj = refobj
def calc_offsets(self, points):
ref_x, ref_y = self.refobj.get_reference_pt()
#return map(lambda x, y: x - ref_x, y - ref_y, points)
def _cvt(pt):
x, y = pt
return x - ref_x, y - ref_y
return map(_cvt, points)
def to_data(self, delta_x, delta_y, viewer=None):
if viewer is None:
viewer = self.viewer
ref_x, ref_y = self.refobj.get_reference_pt()
data_x, data_y = self.refobj.crdmap.to_data(ref_x, ref_y, viewer=viewer)
return data_x + delta_x, data_y + delta_y
def data_to(self, data_x, data_y, viewer=None):
ref_x, ref_y = self.refobj.get_reference_pt()
return data_x - ref_x, data_y - ref_y
def offset_pt(self, pt, xoff, yoff):
# A no-op because this object's points are always considered
# relative to the reference object
return pt
def rotate_pt(self, x, y, theta, xoff=0, yoff=0):
# TODO? Not sure if it is needed with this mapper type
return x, y
class WCSMapper(BaseMapper):
"""A coordinate mapper that maps to the viewer's canvas
in WCS coordinates.
"""
def __init__(self, viewer, data_mapper):
super(WCSMapper, self).__init__()
self.viewer = viewer
self.data_mapper = data_mapper
def to_data(self, lon, lat, viewer=None):
if viewer is None:
viewer = self.viewer
return viewer.tform['wcs_to_data'].to_(lon, lat)
def data_to(self, data_x, data_y, viewer=None):
if viewer is None:
viewer = self.viewer
return viewer.tform['wcs_to_data'].from_(data_x, data_y)
def offset_pt(self, pt, xoff, yoff):
x, y = pt
return wcs.add_offset_radec(x, y, xoff, yoff)
def rotate_pt(self, x, y, theta, xoff=0, yoff=0):
# TODO: rotate in WCS space?
# rotate in data space
xoff, yoff = self.to_data(xoff, yoff)
data_x, data_y = self.to_data(x, y)
rot_x, rot_y = trcalc.rotate_pt(data_x, data_y, theta,
xoff=xoff, yoff=yoff)
x, y = self.data_to(rot_x, rot_y)
return x, y
#END
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