/usr/lib/python2.7/dist-packages/ginga/rv/plugins/Crosshair.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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# Crosshair.py -- Crosshair plugin for Ginga reference viewer
#
# This is open-source software licensed under a BSD license.
# Please see the file LICENSE.txt for details.
#
from ginga import GingaPlugin
from ginga.gw import Widgets
class Crosshair(GingaPlugin.LocalPlugin):
def __init__(self, fv, fitsimage):
# superclass defines some variables for us, like logger
super(Crosshair, self).__init__(fv, fitsimage)
self.xhcolor = 'green'
self.layertag = 'crosshair-canvas'
self.xhtag = None
self.dc = fv.get_draw_classes()
canvas = self.dc.DrawingCanvas()
canvas.name = 'crosshair-canvas'
## canvas.add_draw_mode('move', down=self.btndown,
## move=self.btndrag, up=self.drag)
## canvas.set_draw_mode('move')
## canvas.enable_draw(True)
canvas.add_callback('cursor-down', self.btndown)
canvas.add_callback('cursor-move', self.btndrag)
canvas.set_surface(self.fitsimage)
self.canvas = canvas
# create crosshair
self.xh = self.dc.Crosshair(0, 0, color=self.xhcolor,
coord='data', format='xy')
self.canvas.add(self.xh, redraw=False)
self.w = None
self.formats = ('xy', 'value', 'coords')
self.format = 'xy'
def build_gui(self, container):
top = Widgets.VBox()
top.set_border_width(4)
vbox, sw, orientation = Widgets.get_oriented_box(container)
vbox.set_border_width(4)
vbox.set_spacing(2)
self.msg_font = self.fv.get_font("sansFont", 12)
tw = Widgets.TextArea(wrap=True, editable=False)
tw.set_font(self.msg_font)
self.tw = tw
fr = Widgets.Expander("Instructions")
fr.set_widget(tw)
vbox.add_widget(fr, stretch=0)
fr = Widgets.Frame("Crosshair")
captions = (('Format:', 'label', 'Format', 'combobox'),
)
w, b = Widgets.build_info(captions, orientation=orientation)
self.w = b
combobox = b.format
for name in self.formats:
combobox.append_text(name)
index = self.formats.index(self.format)
combobox.set_index(index)
combobox.add_callback('activated', lambda w, idx: self.set_format())
fr.set_widget(w)
vbox.add_widget(fr, stretch=0)
spacer = Widgets.Label('')
vbox.add_widget(spacer, stretch=1)
top.add_widget(sw, stretch=1)
btns = Widgets.HBox()
btns.set_spacing(3)
btn = Widgets.Button("Close")
btn.add_callback('activated', lambda w: self.close())
btns.add_widget(btn, stretch=0)
btns.add_widget(Widgets.Label(''), stretch=1)
top.add_widget(btns, stretch=0)
container.add_widget(top, stretch=1)
def set_format(self):
index = self.w.format.get_index()
self.format = self.formats[index]
self.xh.format = self.format
self.canvas.redraw(whence=3)
return True
def close(self):
self.fv.stop_local_plugin(self.chname, str(self))
return True
def instructions(self):
self.tw.set_text("""Click or drag to set crosshair.""")
def start(self):
self.instructions()
# start crosshair operation
p_canvas = self.fitsimage.get_canvas()
if not p_canvas.has_object(self.canvas):
p_canvas.add(self.canvas, tag=self.layertag)
self.resume()
def pause(self):
self.canvas.ui_setActive(False)
def resume(self):
self.canvas.ui_setActive(True)
self.fv.show_status("Draw a ruler with the right mouse button")
def stop(self):
# remove the canvas from the image
p_canvas = self.fitsimage.get_canvas()
try:
p_canvas.delete_object_by_tag(self.layertag)
except:
pass
self.canvas.ui_setActive(False)
self.fv.show_status("")
def redo(self):
pass
def move_crosshair(self, viewer, data_x, data_y):
self.logger.debug("move crosshair data x,y=%f,%f" % (data_x, data_y))
self.xh.move_to(data_x, data_y)
self.canvas.update_canvas(whence=3)
def btndown(self, canvas, event, data_x, data_y):
self.move_crosshair(self.fitsimage, data_x, data_y)
def btndrag(self, canvas, event, data_x, data_y):
self.move_crosshair(self.fitsimage, data_x, data_y)
def __str__(self):
return 'crosshair'
#END
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