def loadImage(self, filename=None, duplicate=True, to_top=True, model=None):
"""Loads image. Returns ImageControlBar object.
If image is already loaded: returns old ICB if duplicate=False (raises to top if to_top=True),
or else makes a new control bar.
If model is set to a source name, marks the image as associated with a model source. These can be unloaded en masse by calling
unloadModelImages().
"""
if filename is None:
if not self._load_image_dialog:
dialog = self._load_image_dialog = QFileDialog(self, "Load FITS image", ".",
"FITS images (%s);;All files (*)" % (" ".join(
["*" + ext for ext in FITS_ExtensionList])))
dialog.setFileMode(QFileDialog.ExistingFile)
dialog.setModal(True)
QObject.connect(dialog, SIGNAL("filesSelected(const QStringList &)"), self.loadImage)
self._load_image_dialog.exec_()
return None
if isinstance(filename, QStringList):
filename = filename[0]
filename = str(filename)
# report error if image does not exist
if not os.path.exists(filename):
self.showErrorMessage("""FITS image %s does not exist.""" % filename)
return None
# see if image is already loaded
if not duplicate:
for ic in self._imagecons:
if ic.getFilename() and os.path.samefile(filename, ic.getFilename()):
if to_top:
self.raiseImage(ic)
if model:
self._model_imagecons.add(id(ic))
return ic
# load the FITS image
busy = BusyIndicator()
dprint(2, "reading FITS image", filename)
self.showMessage("""Reading FITS image %s""" % filename, 3000)
QApplication.flush()
try:
image = SkyImage.FITSImagePlotItem(str(filename))
except KeyboardInterrupt:
raise
except:
busy = None
traceback.print_exc()
self.showErrorMessage("""<P>Error loading FITS image %s: %s. This may be due to a bug in Tigger; if the FITS file loads fine in another viewer,
please send the FITS file, along with a copy of any error messages from the text console, to [email protected].</P>""" % (
filename, str(sys.exc_info()[1])))
return None
# create control bar, add to widget stack
ic = self._createImageController(image, "model source '%s'" % model if model else filename, model or image.name,
model=model)
self.showMessage("""Loaded FITS image %s""" % filename, 3000)
dprint(2, "image loaded")
return ic
def openFile(self, filename=None, format=None, merge=False, show=True):
# check that we can close existing model
if not merge and not self._canCloseExistingModel():
return False
if isinstance(filename, QStringList):
filename = filename[0]
filename = str(filename)
# try to determine the file type
filetype, import_func, export_func, doc = Tigger.Models.Formats.resolveFormat(filename, format)
if import_func is None:
self.showErrorMessage("""Error loading model file %s: unknown file format""" % filename)
return
# try to load the specified file
busy = BusyIndicator()
self.showMessage("""Reading %s file %s""" % (filetype, filename), 3000)
QApplication.flush()
try:
model = import_func(filename)
model.setFilename(filename)
except:
busy = None
self.showErrorMessage("""Error loading '%s' file %s: %s""" % (filetype, filename, str(sys.exc_info()[1])))
return
# set the layout
if show:
self.setLayout(self.LayoutImageModel)
# add to content
if merge and self.model:
self.model.addSources(model.sources)
self.showMessage("""Merged in %d sources from '%s' file %s""" % (len(model.sources), filetype, filename),
3000)
self.model.emitUpdate(SkyModel.UpdateAll)
else:
self.showMessage("""Loaded %d sources from '%s' file %s""" % (len(model.sources), filetype, filename),
3000)
self._display_filename = os.path.basename(filename)
self.setModel(model)
self._indicateModelUpdated(updated=False)
# only set self.filename if an export function is available for this format. Otherwise set it to None, so that trying to save
# the file results in a save-as operation (so that we don't save to a file in an unsupported format).
self.filename = filename if export_func else None
def _saveImage(self):
filename = QFileDialog.getSaveFileName(self, "Save FITS file", self._save_dir,
"FITS files(*.fits *.FITS *fts *FTS)")
filename = str(filename)
if not filename:
return
busy = BusyIndicator()
self._imgman.showMessage("""Writing FITS image %s""" % filename, 3000)
QApplication.flush()
try:
self.image.save(filename)
except Exception as exc:
busy = None
traceback.print_exc()
self._imgman.showErrorMessage("""Error writing FITS image %s: %s""" % (filename, str(sys.exc_info()[1])))
return None
self.renderControl().startSavingConfig(filename)
self.setName(self.image.name)
self._qa_save.setVisible(False)
self._wsave.hide()
busy = None
def computeImage(self, expression=None):
"""Computes image from expression (if expression is None, pops up dialog)"""
if expression is None:
(expression, ok) = QInputDialog.getText(self, "Compute image",
"""Enter an image expression to compute.
Any valid numpy expression is supported, and
all functions from the numpy module are available (including sub-modules such as fft).
Use 'a', 'b', 'c' to refer to images.
Examples: "(a+b)/2", "cos(a)+sin(b)", "a-a.mean()", "fft.fft2(a)", etc.""")
# (expression,ok) = QInputDialog.getText(self,"Compute image","""<P>Enter an expression to compute.
# Use 'a', 'b', etc. to refer to loaded images. Any valid numpy expression is supported, and all the
# functions from the numpy module are available. Examples of valid expressions include "(a+b)/2",
# "cos(a)+sin(b)", "a-a.mean()", etc.
# </P>
# """)
expression = str(expression)
if not ok or not expression:
return
# try to parse expression
arglist = [(chr(ord('a') + ic.getNumber()), ic.image) for ic in self._imagecons]
try:
exprfunc = eval("lambda " + (",".join([x[0] for x in arglist])) + ":" + expression,
numpy.__dict__, {})
except Exception as exc:
self.showErrorMessage("""Error parsing expression "%s": %s.""" % (expression, str(exc)))
return None
# try to evaluate expression
self.showMessage("Computing expression \"%s\"" % expression, 10000)
busy = BusyIndicator()
QApplication.flush()
# trim trivial trailing dimensions. This avoids the problem of when an NxMx1 and an NxMx1x1 arrays are added,
# the result is promoted to NxMxMx1 following the numpy rules.
def trimshape(shape):
out = shape
while out and out[-1] == 1:
out = out[:-1]
return out
def trimarray(array):
return array.reshape(trimshape(array.shape))
try:
result = exprfunc(*[trimarray(x[1].data()) for x in arglist])
except Exception as exc:
busy = None
traceback.print_exc()
self.showErrorMessage("""Error evaluating "%s": %s.""" % (expression, str(exc)))
return None
busy = None
if type(result) != numpy.ma.masked_array and type(result) != numpy.ndarray:
self.showErrorMessage(
"""Result of "%s" is of invalid type "%s" (array expected).""" % (expression, type(result).__name__))
return None
# convert coomplex results to real
if numpy.iscomplexobj(result):
self.showErrorMessage("""Result of "%s" is complex. Complex images are currently
not fully supported, so we'll implicitly use the absolute value instead.""" % (expression))
expression = "abs(%s)" % expression
result = abs(result)
# determine which image this expression can be associated with
res_shape = trimshape(result.shape)
arglist = [x for x in arglist if hasattr(x[1], 'fits_header') and trimshape(x[1].data().shape) == res_shape]
if not arglist:
self.showErrorMessage("""Result of "%s" has shape %s, which does not match any loaded FITS image.""" % (
expression, "x".join(map(str, result.shape))))
return None
# look for an image in the arglist with the same projection, and with a valid dirname
# (for the where-to-save hint)
template = arglist[0][1]
# if all images in arglist have the same projection, then it doesn't matter what we use
# else ask
if len([x for x in arglist[1:] if x[1].projection == template.projection]) != len(arglist) - 1:
options = [x[0] for x in arglist]
(which, ok) = QInputDialog.getItem(self, "Compute image",
"Coordinate system to use for the result of \"%s\":" % expression,
options, 0, False)
if not ok:
return None
try:
template = arglist[options.index(which)][1]
except:
pass
# create a FITS image
busy = BusyIndicator()
dprint(2, "creating FITS image", expression)
self.showMessage("""Creating image for %s""" % expression, 3000)
QApplication.flush()
try:
hdu = pyfits.PrimaryHDU(result.transpose(), template.fits_header)
skyimage = SkyImage.FITSImagePlotItem(name=expression, filename=None, hdu=hdu)
except:
busy = None
traceback.print_exc()
self.showErrorMessage("""Error creating FITS image %s: %s""" % (expression, str(sys.exc_info()[1])))
return None
# get directory name for save-to hint
dirname = getattr(template, 'filename', None)
if not dirname:
dirnames = [getattr(img, 'filename') for x, img in arglist if hasattr(img, 'filename')]
dirname = dirnames[0] if dirnames else None
# create control bar, add to widget stack
self._createImageController(skyimage, expression, expression,
save=((dirname and os.path.dirname(dirname)) or "."))
self.showMessage("Created new image for %s" % expression, 3000)
dprint(2, "image created")
def loadImage(self,
filename=None,
duplicate=True,
to_top=True,
model=None):
"""Loads image. Returns ImageControlBar object.
If image is already loaded: returns old ICB if duplicate=False (raises to top if to_top=True),
or else makes a new control bar.
If model is set to a source name, marks the image as associated with a model source. These can be unloaded en masse by calling
unloadModelImages().
"""
if filename is None:
if not self._load_image_dialog:
dialog = self._load_image_dialog = QFileDialog(
self, "Load FITS image", ".",
"FITS images (%s);;All files (*)" %
(" ".join(["*" + ext for ext in FITS_ExtensionList])))
dialog.setFileMode(QFileDialog.ExistingFile)
dialog.setModal(True)
QObject.connect(dialog,
SIGNAL("filesSelected(const QStringList &)"),
self.loadImage)
self._load_image_dialog.exec_()
return None
if isinstance(filename, QStringList):
filename = filename[0]
filename = str(filename)
# report error if image does not exist
if not os.path.exists(filename):
self.showErrorMessage("""FITS image %s does not exist.""" %
filename)
return None
# see if image is already loaded
if not duplicate:
for ic in self._imagecons:
if ic.getFilename() and os.path.samefile(
filename, ic.getFilename()):
if to_top:
self.raiseImage(ic)
if model:
self._model_imagecons.add(id(ic))
return ic
# load the FITS image
busy = BusyIndicator()
dprint(2, "reading FITS image", filename)
self.showMessage("""Reading FITS image %s""" % filename, 3000)
QApplication.flush()
try:
image = SkyImage.FITSImagePlotItem(str(filename))
except KeyboardInterrupt:
raise
except:
busy = None
traceback.print_exc()
self.showErrorMessage(
"""<P>Error loading FITS image %s: %s. This may be due to a bug in Tigger; if the FITS file loads fine in another viewer,
please send the FITS file, along with a copy of any error messages from the text console, to [email protected].</P>"""
% (filename, str(sys.exc_info()[1])))
return None
# create control bar, add to widget stack
ic = self._createImageController(image,
"model source '%s'" %
model if model else filename,
model or image.name,
model=model)
self.showMessage("""Loaded FITS image %s""" % filename, 3000)
dprint(2, "image loaded")
return ic
def computeImage(self, expression=None):
"""Computes image from expression (if expression is None, pops up dialog)"""
if expression is None:
(expression, ok) = QInputDialog.getText(
self, "Compute image", """Enter an image expression to compute.
Any valid numpy expression is supported, and
all functions from the numpy module are available (including sub-modules such as fft).
Use 'a', 'b', 'c' to refer to images.
Examples: "(a+b)/2", "cos(a)+sin(b)", "a-a.mean()", "fft.fft2(a)", etc."""
)
# (expression,ok) = QInputDialog.getText(self,"Compute image","""<P>Enter an expression to compute.
# Use 'a', 'b', etc. to refer to loaded images. Any valid numpy expression is supported, and all the
# functions from the numpy module are available. Examples of valid expressions include "(a+b)/2",
# "cos(a)+sin(b)", "a-a.mean()", etc.
# </P>
# """)
expression = str(expression)
if not ok or not expression:
return
# try to parse expression
arglist = [(chr(ord('a') + ic.getNumber()), ic.image)
for ic in self._imagecons]
try:
exprfunc = eval(
"lambda " + (",".join([x[0]
for x in arglist])) + ":" + expression,
numpy.__dict__, {})
except Exception as exc:
self.showErrorMessage("""Error parsing expression "%s": %s.""" %
(expression, str(exc)))
return None
# try to evaluate expression
self.showMessage("Computing expression \"%s\"" % expression, 10000)
busy = BusyIndicator()
QApplication.flush()
# trim trivial trailing dimensions. This avoids the problem of when an NxMx1 and an NxMx1x1 arrays are added,
# the result is promoted to NxMxMx1 following the numpy rules.
def trimshape(shape):
out = shape
while out and out[-1] == 1:
out = out[:-1]
return out
def trimarray(array):
return array.reshape(trimshape(array.shape))
try:
result = exprfunc(*[trimarray(x[1].data()) for x in arglist])
except Exception as exc:
busy = None
traceback.print_exc()
self.showErrorMessage("""Error evaluating "%s": %s.""" %
(expression, str(exc)))
return None
busy = None
if type(result) != numpy.ma.masked_array and type(
result) != numpy.ndarray:
self.showErrorMessage(
"""Result of "%s" is of invalid type "%s" (array expected)."""
% (expression, type(result).__name__))
return None
# convert coomplex results to real
if numpy.iscomplexobj(result):
self.showErrorMessage(
"""Result of "%s" is complex. Complex images are currently
not fully supported, so we'll implicitly use the absolute value instead."""
% (expression))
expression = "abs(%s)" % expression
result = abs(result)
# determine which image this expression can be associated with
res_shape = trimshape(result.shape)
arglist = [
x for x in arglist if hasattr(x[1], 'fits_header')
and trimshape(x[1].data().shape) == res_shape
]
if not arglist:
self.showErrorMessage(
"""Result of "%s" has shape %s, which does not match any loaded FITS image."""
% (expression, "x".join(map(str, result.shape))))
return None
# look for an image in the arglist with the same projection, and with a valid dirname
# (for the where-to-save hint)
template = arglist[0][1]
# if all images in arglist have the same projection, then it doesn't matter what we use
# else ask
if len(
[x for x in arglist[1:] if x[1].projection == template.projection
]) != len(arglist) - 1:
options = [x[0] for x in arglist]
(which, ok) = QInputDialog.getItem(
self, "Compute image",
"Coordinate system to use for the result of \"%s\":" %
expression, options, 0, False)
if not ok:
return None
try:
template = arglist[options.index(which)][1]
except:
pass
# create a FITS image
busy = BusyIndicator()
dprint(2, "creating FITS image", expression)
self.showMessage("""Creating image for %s""" % expression, 3000)
QApplication.flush()
try:
hdu = pyfits.PrimaryHDU(result.transpose(), template.fits_header)
skyimage = SkyImage.FITSImagePlotItem(name=expression,
filename=None,
hdu=hdu)
except:
busy = None
traceback.print_exc()
self.showErrorMessage("""Error creating FITS image %s: %s""" %
(expression, str(sys.exc_info()[1])))
return None
# get directory name for save-to hint
dirname = getattr(template, 'filename', None)
if not dirname:
dirnames = [
getattr(img, 'filename') for x, img in arglist
if hasattr(img, 'filename')
]
dirname = dirnames[0] if dirnames else None
# create control bar, add to widget stack
self._createImageController(
skyimage,
expression,
expression,
save=((dirname and os.path.dirname(dirname)) or "."))
self.showMessage("Created new image for %s" % expression, 3000)
dprint(2, "image created")
