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# Copyright (c) 2017 Weitian LI <liweitianux@live.com>
# MIT license
"""
Region utilities.
NOTE:
Only support the commonly used region shapes in CIAO format.
While more complex shapes and DS9 format are not considered
at the moment.
"""
import os
import re
class Point:
"""
Point region: point(xc,yc)
"""
shape = "point"
def __init__(self, xc=None, yc=None):
if isinstance(xc, str):
self.parse(regstr=xc)
else:
self.xc = xc
self.yc = yc
def parse(self, regstr):
g = re.split(r"[(),]", regstr)
self.xc = float(g[1])
self.yc = float(g[2])
def __str__(self):
return "%s(%.4f,%.4f)" % (self.shape, self.xc, self.yc)
class Circle:
"""
Circle region: circle(xc,yc,radius)
"""
shape = "circle"
def __init__(self, xc=None, yc=None, radius=None):
if isinstance(xc, str):
self.parse(regstr=xc)
else:
self.xc = xc
self.yc = yc
self.radius = radius
def parse(self, regstr):
g = re.split(r"[(),]", regstr)
self.xc = float(g[1])
self.yc = float(g[2])
self.radius = float(g[3])
def __str__(self):
return "%s(%.4f,%.4f,%.4f)" % (self.shape, self.xc, self.yc,
self.radius)
class Annulus:
"""
Annulus region:
annulus(xc,yc,radius,radius2)
+ xc, yc : center
+ radius, radius2 : inner, outer radius
"""
shape = "annulus"
def __init__(self, xc=None, yc=None, radius=None, radius2=None):
if isinstance(xc, str):
self.parse(regstr=xc)
else:
self.xc = xc
self.yc = yc
self.radius = radius
self.radius2 = radius2
def parse(self, regstr):
g = re.split(r"[(),]", regstr)
self.xc = float(g[1])
self.yc = float(g[2])
self.radius = float(g[3])
self.radius2 = float(g[4])
def __str__(self):
return "%s(%.4f,%.4f,%.4f,%.4f)" % (self.shape, self.xc, self.yc,
self.radius, self.radius2)
class Pie:
"""
Pie region:
pie(xc,yc,radius,radius2,angle1,angle2)
+ xc, yc : center
+ radius, radius2 : inner, outer radius
+ angle1, angle2: start, end angle [0, 360)
"""
shape = "pie"
def __init__(self, xc=None, yc=None, radius=None, radius2=None,
angle1=0.0, angle2=360.0):
if isinstance(xc, str):
self.parse(regstr=xc)
else:
self.xc = xc
self.yc = yc
self.radius = radius
self.radius2 = radius2
self.angle1 = angle1
self.angle2 = angle2
def parse(self, regstr):
g = re.split(r"[(),]", regstr)
self.xc = float(g[1])
self.yc = float(g[2])
self.radius = float(g[3])
self.radius2 = float(g[4])
self.angle1 = float(g[5])
self.angle2 = float(g[6])
def __str__(self):
return "%s(%.4f,%.4f,%.4f,%.4f,%.4f,%.4f)" % (
self.shape, self.xc, self.yc, self.radius, self.radius2,
self.angle1, self.angle2)
class Ellipse:
"""
Ellipse region:
ellipse(xc,yc,radius,radius2,rotation)
+ xc, yc : center
+ radius, radius2 : semi-major / semi-minor axis
+ rotation: rotation angle [0, 360)
"""
shape = "ellipse"
def __init__(self, xc=None, yc=None, radius=None, radius2=None,
rotation=0.0):
if isinstance(xc, str):
self.parse(regstr=xc)
else:
self.xc = xc
self.yc = yc
self.radius = radius
self.radius2 = radius2
self.rotation = rotation
def parse(self, regstr):
g = re.split(r"[(),]", regstr)
self.xc = float(g[1])
self.yc = float(g[2])
self.radius = float(g[3])
self.radius2 = float(g[4])
self.rotation = float(g[5])
def __str__(self):
return "%s(%.4f,%.4f,%.4f,%.4f,%.4f)" % (
self.shape, self.xc, self.yc, self.radius,
self.radius2, self.rotation)
class Box:
"""
Box region: box(xc,yc,width,height,rotation)
"""
shape = "box"
def __init__(self, xc=None, yc=None, width=None, height=None,
rotation=0.0):
if isinstance(xc, str):
self.parse(regstr=xc)
else:
self.xc = xc
self.yc = yc
self.width = width
self.height = height
self.rotation = rotation
def parse(self, regstr):
g = re.split(r"[(),]", regstr)
self.xc = float(g[1])
self.yc = float(g[2])
self.width = float(g[3])
self.height = float(g[4])
self.rotation = float(g[5])
def __str__(self):
return "%s(%.4f,%.4f,%.4f,%.4f,%.4f)" % (
self.shape, self.xc, self.yc, self.width,
self.height, self.rotation)
class Regions:
"""
Manipulate the region files (CIAO format), as well as parse regions
from strings.
"""
REGION_SHAPES = {
"point": Point,
"circle": Circle,
"annulus": Annulus,
"pie": Pie,
"ellipse": Ellipse,
"box": Box,
}
def __init__(self, regfile=None):
if regfile:
self.load(regfile)
else:
self.regions = []
def load(self, infile):
regstr = []
for line in open(infile):
if not (re.match(r"^\s*#.*$", line) or re.match(r"^\s*$", line)):
regstr.append(line.strip())
self.regions = self.parse(regstr)
def save(self, outfile, clobber=False):
if (not clobber) and os.path.exists(outfile):
raise OSError("output file already exists: %s" % outfile)
regstr = [str(reg) for reg in self.regions]
open(outfile, "w").write("\n".join(regstr) + "\n")
@classmethod
def parse(self, regstr):
"""
Parse the given (list of) region string(s), and return the
corresponding parsed region objects.
"""
if isinstance(regstr, list):
return [self.parse_single(reg) for reg in regstr]
else:
return self.parse_single(regstr)
@classmethod
def parse_single(self, regstr):
"""
Parse the given single region string to its corresponding
region object.
"""
shape = regstr.strip().split('(')[0].lower()
if shape in self.REGION_SHAPES:
return self.REGION_SHAPES[shape](regstr)
else:
raise ValueError("unknown region shape: %s" % shape)
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