trafo_Rotate.py
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title = "Map Rotation"
tip = "regrids a map of projection and coordinate system into a different one"
onein = True
import numpy as np
from kapteyn import wcs
from kapteyn.interpolation import map_coordinates
from nodmath import map_interpolate
from nodmath import extract
from guidata.qt.QtGui import QMessageBox
from guidata.dataset.datatypes import DataSet
from guidata.dataset.dataitems import (IntItem, StringItem, ChoiceItem, FloatItem, BoolItem)
from guiqwt.config import _
def nint(x):
if x > 0: return int(x+0.5)
else: return int(x-0.5)
class NOD3_App:
def __init__(self, parent):
self.parent = parent
self.parent.activateWindow()
def compute_app(self, **args):
class FuncParam(DataSet):
lon = StringItem('RA [hh:mm:ss.ss]')
lat = StringItem('Dec [dd:mm:ss.s]')
angle = FloatItem("RotAngle", default=0.0, min=-360.0, max=360.0)
name = title.replace(" ", "")
if args == {}:
param = FuncParam(_(title), "Define your coordinate center:")
else:
param = self.parent.ScriptParameter(name, args)
self.parent.compute_11(name, lambda m, p: self.function(m, p), param, onein)
def Error(self, msg):
QMessageBox.critical(self.parent.parent(), title,
_(u"Error:")+"\n%s" % str(msg))
def setRefPoint(self, header):
# set ref point to map center
proj1 = wcs.Projection(header) # source projection
Naxis1, Naxis2 = header['NAXIS1'], header['NAXIS2']
newvals = proj1.toworld((header['NAXIS1']/2.0, header['NAXIS2']/2.0))
header['CRVAL1'], header['CRVAL2'] = newvals
header['CRPIX1'], header['CRPIX2'] = (Naxis1+1)/2.0, (Naxis2+1)/2.0
return header
def newEdges(self, header):
edges = []
proj1 = wcs.Projection(header) # source projection
lam, bet = proj1.toworld((0.0, 0.0))
edges.append(self.trans((lam, bet)))
lam, bet = proj1.toworld((0.0, header['NAXIS2']))
edges.append(self.trans((lam, bet)))
lam, bet = proj1.toworld((header['NAXIS1'], header['NAXIS2']))
edges.append(self.trans((lam, bet)))
lam, bet = proj1.toworld((header['NAXIS1'], 0.0))
edges.append(self.trans((lam, bet)))
return np.array(edges)
def newHeaderAndSize(self, header, newproj, angle):
newheader = header.copy()
newheader['CROTA2'] = (newheader['CROTA2'] - angle)
newheader['CTYPE1'], newheader['CTYPE2'] = newproj
newheader['CRVAL1'], newheader['CRVAL2'] = self.trans((header['CRVAL1'],header['CRVAL2']))
try:
edges = self.newEdges(header)
except:
self.Error("impossible determin new map size\nplease use 'same size' option")
return [], p
proj2 = wcs.Projection(newheader)
px, py = proj2.topixel(edges).T
pxmin, pxmax = min(px), max(px)
pymin, pymax = min(py), max(py)
naxis1 = int((pxmax-pxmin+0.99)*1.5)
naxis2 = int((pymax-pymin+0.99)*1.5)
#naxis1 = min(int((pxmax-pxmin+0.99)*1.5), 361*abs(header['CDELT1']))
#naxis2 = min(int((pymax-pymin+0.99)*1.5), 181*abs(header['CDELT2']))
newheader['NAXIS1'], newheader['NAXIS2'] = naxis1, naxis2
newheader['CRPIX1'], newheader['CRPIX2'] = (naxis1+1)/2.0, (naxis2+1)/2.0
return newheader
def todeg(self, coord):
if coord.strip().find("-") == 0:
s = -1
else:
s = 1
dms = coord.split(":")
d = float(dms[0]) + float(dms[1])/60.0 + float(dms[2])/3600.0
return s*d
def check_header(self, header):
import xml2nod3
Nod3 = xml2nod3.NOD3_Fits()
keys, nod3header = Nod3.NOD3Header()
for key in header.keys():
if not key in keys:
del header[key]
return header
def function(self, m, p):
nod3header = self.check_header(m.header)
p.size = "no automatic"
header = nod3header.copy()
NAXIS = 1*header['NAXIS']
header['NAXIS'] = 2
pl = 15*self.todeg(p.lon)
pb = self.todeg(p.lat)
#header['CRVAL1'] = pl
#header['CRVAL2'] = pb
# for the moment no other choise
header['CTYPE1'] = header['CTYPE1'].replace("DES", "CAR")
header['CTYPE2'] = header['CTYPE2'].replace("DES", "CAR")
if not 'CROTA1' in header:
header['CROTA1'] = 0.0
if not 'CROTA2' in header:
header['CROTA2'] = 0.0
header = self.setRefPoint(header)
proj1 = wcs.Projection(header) # source projection
newheader = header.copy()
newheader['CRVAL1'] = pl
newheader['CRVAL2'] = pb
newheader['CROTA1'] = p.angle
newheader['CROTA2'] = p.angle
proj2 = wcs.Projection(newheader) # destination projection
proj2.skysys = proj1.skysys
x, y = wcs.coordmap(proj1, proj2)
m.header = newheader
m.data = map_interpolate(m.data, y, x)
#m.header['CTYPE1'] = m.header['CTYPE1'][:-3] + "DES"
#m.header['CTYPE2'] = m.header['CTYPE2'][:-3] + "DES"
#m.data = map_coordinates(m.data, (x, y), order=1, cval=np.NaN)
if p.size == "automatic":
#if not p.size == "user defined":
m = self.parent.removeNANedges(m)
return m, p