/usr/lib/python2.7/dist-packages/ginga/rv/plugins/Ruler.py is in python-ginga 2.6.1-2.
This file is owned by root:root, with mode 0o644.
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# Ruler.py -- Ruler 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 Ruler(GingaPlugin.LocalPlugin):
def __init__(self, fv, fitsimage):
# superclass defines some variables for us, like logger
super(Ruler, self).__init__(fv, fitsimage)
self.rulecolor = 'green'
self.layertag = 'ruler-canvas'
self.ruletag = None
self.dc = fv.get_draw_classes()
canvas = self.dc.DrawingCanvas()
canvas.enable_draw(True)
canvas.enable_edit(True)
canvas.set_drawtype('ruler', color='cyan')
canvas.set_callback('draw-event', self.wcsruler)
canvas.set_callback('draw-down', self.clear)
canvas.set_callback('edit-event', self.edit_cb)
canvas.set_draw_mode('draw')
canvas.set_surface(self.fitsimage)
canvas.register_for_cursor_drawing(self.fitsimage)
canvas.name = 'Ruler-canvas'
self.canvas = canvas
self.w = None
self.unittypes = ('arcmin', 'degrees', 'pixels')
self.units = 'arcmin'
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("Ruler")
captions = (('Units:', 'label', 'Units', 'combobox'),
)
w, b = Widgets.build_info(captions, orientation=orientation)
self.w = b
combobox = b.units
for name in self.unittypes:
combobox.append_text(name)
index = self.unittypes.index(self.units)
combobox.set_index(index)
combobox.add_callback('activated', lambda w, idx: self.set_units())
fr.set_widget(w)
vbox.add_widget(fr, stretch=0)
mode = self.canvas.get_draw_mode()
hbox = Widgets.HBox()
btn1 = Widgets.RadioButton("Draw")
btn1.set_state(mode == 'draw')
btn1.add_callback('activated', lambda w, val: self.set_mode_cb('draw', val))
btn1.set_tooltip("Choose this to draw a ruler")
self.w.btn_draw = btn1
hbox.add_widget(btn1)
btn2 = Widgets.RadioButton("Edit", group=btn1)
btn2.set_state(mode == 'edit')
btn2.add_callback('activated', lambda w, val: self.set_mode_cb('edit', val))
btn2.set_tooltip("Choose this to edit a ruler")
self.w.btn_edit = btn2
hbox.add_widget(btn2)
hbox.add_widget(Widgets.Label(''), stretch=1)
vbox.add_widget(hbox, 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_units(self):
index = self.w.units.get_index()
units = self.unittypes[index]
self.units = units
self.canvas.set_drawtype('ruler', color='cyan', units=units)
if self.ruletag is not None:
obj = self.canvas.get_object_by_tag(self.ruletag)
if obj.kind == 'ruler':
obj.units = units
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("""Draw (or redraw) a line with the cursor.
Display the Zoom tab at the same time to precisely see detail while drawing.""")
def start(self):
self.instructions()
# start ruler drawing operation
p_canvas = self.fitsimage.get_canvas()
if not p_canvas.has_object(self.canvas):
p_canvas.add(self.canvas, tag=self.layertag)
self.canvas.delete_all_objects()
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):
obj = self.canvas.get_object_by_tag(self.ruletag)
if obj.kind != 'ruler':
return True
# redraw updates ruler measurements
self.canvas.redraw(whence=3)
def clear(self, canvas, button, data_x, data_y):
self.canvas.delete_all_objects()
self.ruletag = None
return False
def wcsruler(self, surface, tag):
obj = self.canvas.get_object_by_tag(tag)
if obj.kind != 'ruler':
return True
# remove the old ruler
try:
self.canvas.delete_object_by_tag(self.ruletag)
except:
pass
# change some characteristics of the drawn image and
# save as the new ruler
self.ruletag = tag
obj.color = self.rulecolor
obj.cap = 'ball'
self.canvas.redraw(whence=3)
def edit_cb(self, canvas, obj):
self.redo()
return True
def edit_select_ruler(self):
if self.ruletag is not None:
obj = self.canvas.get_object_by_tag(self.ruletag)
self.canvas.edit_select(obj)
else:
self.canvas.clear_selected()
self.canvas.update_canvas()
def set_mode_cb(self, mode, tf):
if tf:
self.canvas.set_draw_mode(mode)
if mode == 'edit':
self.edit_select_ruler()
return True
def __str__(self):
return 'ruler'
#END
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