def set_image(self, channel, paninfo, image):
if image is None or not isinstance(image, BaseImage):
self.logger.debug("no main image--clearing Pan viewer")
paninfo.panimage.clear()
return
if not self.use_shared_canvas:
self.logger.debug("setting Pan viewer image")
paninfo.panimage.set_image(image)
else:
paninfo.panimage.zoom_fit()
p_canvas = paninfo.panimage.get_private_canvas()
# remove old compasses
try:
p_canvas.delete_object_by_tag(paninfo.compass_wcs)
except Exception:
pass
try:
p_canvas.delete_object_by_tag(paninfo.compass_xy)
except Exception:
pass
x, y = 0.5, 0.5
radius = 0.1
paninfo.compass_xy = p_canvas.add(self.dc.Compass(
x, y, radius,
color=self.settings.get('xy_compass_color', 'yellow'),
fontsize=14, ctype='pixel', coord='percentage'))
# create compass
if image.has_valid_wcs():
try:
# HACK: force a wcs error here if one is going to happen
wcs.add_offset_xy(image, x, y, 1.0, 1.0)
radius = 0.2
paninfo.compass_wcs = p_canvas.add(self.dc.Compass(
x, y, radius,
color=self.settings.get('compass_color', 'skyblue'),
fontsize=14, ctype='wcs', coord='percentage'))
except Exception as e:
paninfo.compass_wcs = None
self.logger.warning("Can't calculate wcs compass: %s" % (
str(e)))
try:
# log traceback, if possible
(type_, value_, tb) = sys.exc_info()
tb_str = "".join(traceback.format_tb(tb))
self.logger.error("Traceback:\n%s" % (tb_str))
except Exception:
tb_str = "Traceback information unavailable."
self.logger.error(tb_str)
self.panset(channel.fitsimage, channel, paninfo)
def add_offset_xy(self, x, y, delta_deg_x, delta_deg_y):
warnings.warn(
"This function has been deprecated--"
"use the version in ginga.util.wcs", PendingDeprecationWarning)
return wcs.add_offset_xy(self, x, y, delta_deg_x, delta_deg_y)