Add this list of features to the viewer

[mwcraig]

These are my notes from the sprint Saturday night:

# Define a callback that shows the output of a print
out = ipyw.Output()

def show_event(viewer, event, datax, datay):
    with out:
       # print(dir(event))
        print(event.data_x, event.data_y)
display(out)

# This would work for adding markers with the appropriate callback
gvc = w._viewer.get_canvas()
gvc.add_callback('cursor-down', show_event)

# Changing binds for pan/zoom
bind_map = w._viewer.get_bindmap()

# ms is click-drag
# kp is keypress
# sc is scroll
# map_event args: mode, modifiers (usually empty), trigger, event_name (last two as strings)
bind_map.map_event(None, (), 'ms_left', 'pan')

# contrast with right mouse
bind_map.map_event(None, (), 'ms_right', 'contrast')

# zoom by scrolling
bind_map.map_event(None, (), 'pa_pan', 'zoom')

# pan by scrolling
bind_map.map_event(None, (), 'pa_pan', 'pan')

# restore contrast with ctrl-right-click... NOTE TUPLE FOR MODIFIER
bind_map.map_event(None, ('ctrl',), 'ms_right', 'contrast_restore')

# click to center
bind_map.map_event(None, ('shift',), 'ms_left', 'panset')

# to bind a custom event to a function of your choosing

bind_map.map_event(None, (), 'kp_w', 'my_custom_event')

# Signature of callback_function is
def callback_function(viewer, event, data_x, data_y, *args):
    with out:
        print('The magic key was pressed')
    pass

# prefix for keypress is keydown-
# suffix for ms_... is -down
# suffix for sc_... is -scroll
w._viewer.set_callback('keydown-my_custom_event', callback_function)

[pllim]

Just a note for my future self... This was from Scipy 2018.

[pllim]

These are already implemented:

• Show print output
• Click to mark
• Click to center