/usr/lib/python2.7/dist-packages/ginga/web/pgw/ImageViewPg.py is in python-ginga 2.6.1-2.
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# ImageViewPg.py -- a backend for Ginga using javascript and
# HTML5 canvas and websockets
#
# This is open-source software licensed under a BSD license.
# Please see the file LICENSE.txt for details.
#
from __future__ import print_function
import threading
import time
from ginga import Mixins, Bindings
from ginga.misc import log, Bunch
from ginga.canvas.mixins import DrawingMixin, CanvasMixin, CompoundMixin
from ginga.util.toolbox import ModeIndicator
from ginga.web.pgw import PgHelp
try:
# See if we have aggdraw module--best choice
from ginga.aggw.ImageViewAgg import ImageViewAgg as ImageView, \
ImageViewAggError as ImageViewError
except ImportError:
try:
# No, hmm..ok, see if we have PIL module...
from ginga.pilw.ImageViewPil import ImageViewPil as ImageView, \
ImageViewPilError as ImageViewError
except ImportError:
try:
# No dice. How about the OpenCv module?
from ginga.cvw.ImageViewCv import ImageViewCv as ImageView, \
ImageViewCvError as ImageViewError
except ImportError:
# Fall back to mock--there will be no graphic overlays
from ginga.mockw.ImageViewMock import ImageViewMock as ImageView, \
ImageViewMockError as ImageViewError
default_html_fmt = 'jpeg'
class ImageViewPgError(ImageViewError):
pass
class ImageViewPg(ImageView):
def __init__(self, logger=None, rgbmap=None, settings=None):
ImageView.__init__(self, logger=logger,
rgbmap=rgbmap,
settings=settings)
self.pgcanvas = None
# format for rendering image on HTML5 canvas
# NOTE: 'jpeg' has much better performance than 'png', but can show
# some artifacts, especially noticeable with small text
self.t_.setDefaults(html5_canvas_format=default_html_fmt)
#self.defer_redraw = False
def set_widget(self, canvas):
"""Call this method with the widget that will be used
for the display.
"""
self.logger.debug("set widget canvas=%s" % canvas)
self.pgcanvas = canvas
def get_widget(self):
return self.pgcanvas
def update_image(self):
self.logger.debug("update_image pgcanvas=%s" % self.pgcanvas)
if self.pgcanvas is None:
return
try:
self.logger.debug("getting image as buffer...")
format = self.t_.get('html5_canvas_format', default_html_fmt)
buf = self.get_rgb_image_as_bytes(format=format, quality=90)
self.logger.debug("got '%s' RGB image buffer, len=%d" % (
format, len(buf)))
self.pgcanvas.do_update(buf)
except Exception as e:
self.logger.error("Couldn't update canvas: %s" % (str(e)))
def reschedule_redraw(self, time_sec):
if self.pgcanvas is not None:
self.pgcanvas.reset_timer('redraw', time_sec)
else:
self.delayed_redraw()
def get_plain_image_as_widget(self):
"""Used for generating thumbnails. Does not include overlaid
graphics.
"""
image_buf = self.get_image_as_bytes()
return image_buf
def save_plain_image_as_file(self, filepath, format='png', quality=90):
"""Used for generating thumbnails. Does not include overlaid
graphics.
"""
pass
def set_cursor(self, cursor):
if self.pgcanvas is None:
return
#self.pgcanvas.config(cursor=cursor)
def onscreen_message(self, text, delay=None, redraw=True):
if self.pgcanvas is None:
return
self.set_onscreen_message(text, redraw=redraw)
if delay:
self.pgcanvas.reset_timer('msg', delay)
def clear_onscreen_message(self):
self.logger.debug("clearing message...")
self.onscreen_message(None)
def configure_window(self, width, height):
self.configure_surface(width, height)
def map_event(self, event):
self.logger.info("window mapped to %dx%d" % (
event.width, event.height))
self.configure_window(event.width, event.height)
self.redraw(whence=0)
def resize_event(self, event):
wd, ht = event.width, event.height
# Not quite ready for prime-time--browser seems to mess with the
# aspect ratio
self.logger.info("canvas resized to %dx%d" % (wd, ht))
self.configure_window(wd, ht)
self.redraw(whence=0)
def resize(self, width, height):
"""Resize our window to width x height.
May not work---depending on how the HTML5 canvas is embedded.
"""
# this shouldn't be needed
self.configure_window(width, height)
self.pgcanvas.resize(width, height)
# hack to force a browser reload
app = self.pgcanvas.get_app()
app.do_operation('reload_page', id=self.pgcanvas.id)
class ImageViewEvent(ImageViewPg):
def __init__(self, logger=None, rgbmap=None, settings=None):
ImageViewPg.__init__(self, logger=logger, rgbmap=rgbmap,
settings=settings)
# Does widget accept focus when mouse enters window
self.enter_focus = self.t_.get('enter_focus', True)
self._button = 0
# @$%&^(_)*&^ javascript!!
self._keytbl = {
16: 'shift_l',
#'shift_r': 'shift_r',
17: 'control_l',
#'control_r': 'control_r',
18: 'alt_l',
#'alt_r': 'alt_r',
'super_l': 'super_l',
'super_r': 'super_r',
'meta_right': 'meta_right',
ord('~'): '~',
# borrow ~ for escape for use in browser
#ord('~'): 'escape',
ord('`'): 'backquote',
ord('!'): '!',
ord('@'): '@',
ord('#'): '#',
ord('%'): '%',
ord('^'): '^',
ord('&'): '&',
ord('*'): '*',
ord('$'): '$',
ord('('): '(',
ord(')'): ')',
ord('_'): '_',
ord('-'): '-',
ord('+'): '+',
ord('='): '=',
ord('{'): '{',
ord('}'): '}',
ord('['): '[',
ord(']'): ']',
ord('|'): '|',
ord(':'): ':',
ord(';'): ';',
ord('"'): 'doublequote',
ord("'"): 'singlequote',
ord('\\'): 'backslash',
ord('<'): '<',
ord('>'): '>',
ord(','): ',',
ord('.'): '.',
ord('?'): '?',
ord('/'): '/',
ord(' '): 'space',
27: 'escape',
13: 'return',
9: 'tab',
'f1': 'f1',
'f2': 'f2',
'f3': 'f3',
'f4': 'f4',
'f5': 'f5',
'f6': 'f6',
'f7': 'f7',
'f8': 'f8',
'f9': 'f9',
'f10': 'f10',
'f11': 'f11',
'f12': 'f12',
}
self._browser_problem_keys = ('shift_l', 'control_l', 'escape',
'tab')
# Define cursors for pick and pan
#hand = openHandCursor()
hand = 'fleur'
self.define_cursor('pan', hand)
cross = 'cross'
self.define_cursor('pick', cross)
for name in ('motion', 'button-press', 'button-release',
'key-press', 'key-release', 'drag-drop',
'scroll', 'map', 'focus', 'enter', 'leave',
'pinch', 'rotate', 'pan', 'swipe', 'tap'):
self.enable_callback(name)
def set_widget(self, canvas):
super(ImageViewEvent, self).set_widget(canvas)
# see event binding setup in Viewers.py
#return self.make_callback('map')
def transkey(self, keycode):
self.logger.debug("key code in js '%d'" % (keycode))
try:
return self._keytbl[keycode]
except KeyError:
return chr(keycode)
def get_keyTable(self):
return self._keytbl
def set_enter_focus(self, tf):
self.enter_focus = tf
def focus_event(self, event, hasFocus):
self.logger.debug("focus event: focus=%s" % (hasFocus))
return self.make_callback('focus', hasFocus)
def enter_notify_event(self, event):
self.logger.debug("entering widget...")
## if self.enter_focus:
## self.pgcanvas.focus_set()
return self.make_callback('enter')
def leave_notify_event(self, event):
self.logger.debug("leaving widget...")
return self.make_callback('leave')
def key_press_event(self, event):
keycode = event.key_code
keyname = self.transkey(keycode)
self.logger.debug("key press event, key=%s" % (keyname))
return self.make_ui_callback('key-press', keyname)
def key_down_event(self, event):
keycode = event.key_code
keyname = self.transkey(keycode)
self.logger.debug("key press event, key=%s" % (keyname))
# special hack for modifiers
if keyname in self._browser_problem_keys:
return self.make_ui_callback('key-press', keyname)
return False
def key_up_event(self, event):
keycode = event.key_code
keyname = self.transkey(keycode)
self.logger.debug("key release event, key=%s" % (keyname))
# special hack for modifiers
if keyname in self._browser_problem_keys:
return self.make_ui_callback('key-release', keyname)
return False
def button_press_event(self, event):
x = event.x; y = event.y
self.last_win_x, self.last_win_y = x, y
button = 0
button |= 0x1 << event.button
self._button = button
self.logger.debug("button event at %dx%d, button=%x" % (x, y, button))
data_x, data_y = self.get_data_xy(x, y)
self.last_data_x, self.last_data_y = data_x, data_y
return self.make_ui_callback('button-press', button, data_x, data_y)
def button_release_event(self, event):
# event.button, event.x, event.y
x = event.x; y = event.y
self.last_win_x, self.last_win_y = x, y
button = 0
button |= 0x1 << event.button
self._button = 0
self.logger.debug("button release at %dx%d button=%x" % (x, y, button))
data_x, data_y = self.get_data_xy(x, y)
self.last_data_x, self.last_data_y = data_x, data_y
return self.make_ui_callback('button-release', button, data_x, data_y)
def motion_notify_event(self, event):
#button = 0
button = self._button
x, y = event.x, event.y
self.last_win_x, self.last_win_y = x, y
self.logger.debug("motion event at %dx%d, button=%x" % (x, y, button))
data_x, data_y = self.get_data_xy(x, y)
self.last_data_x, self.last_data_y = data_x, data_y
return self.make_ui_callback('motion', button, data_x, data_y)
def scroll_event(self, event):
x, y = event.x, event.y
delta = event.delta
self.last_win_x, self.last_win_y = x, y
# 15 deg is standard 1-click turn for a wheel mouse
# delta usually returns +/- 1.0
numDegrees = abs(delta) * 15.0
direction = 0.0
if delta > 0:
direction = 0.0
elif delta < 0:
direction = 180.0
self.logger.debug("scroll deg=%f direction=%f" % (
numDegrees, direction))
data_x, data_y = self.get_data_xy(x, y)
self.last_data_x, self.last_data_y = data_x, data_y
return self.make_ui_callback('scroll', direction, numDegrees,
data_x, data_y)
def drop_event(self, event):
data = event.delta
self.logger.debug("data=%s" % (str(data)))
paths = data.split('\n')
self.logger.debug("dropped text(s): %s" % (str(paths)))
return self.make_ui_callback('drag-drop', paths)
def pinch_event(self, event):
self.logger.debug("pinch: event=%s" % (str(event)))
state = 'move'
if event.type == 'pinchstart' or event.isfirst:
state = 'start'
elif event.type == 'pinchend' or event.isfinal:
state = 'end'
rot = event.theta
scale = event.scale
self.logger.debug("pinch gesture rot=%f scale=%f state=%s" % (
rot, scale, state))
return self.make_ui_callback('pinch', state, rot, scale)
def rotate_event(self, event):
state = 'move'
if event.type == 'rotatestart' or event.isfirst:
state = 'start'
elif event.type == 'rotateend' or event.isfinal:
state = 'end'
rot = event.theta
self.logger.debug("rotate gesture rot=%f state=%s" % (
rot, state))
return self.make_ui_callback('rotate', state, rot)
def pan_event(self, event):
state = 'move'
if event.type == 'panstart' or event.isfirst:
state = 'start'
elif event.type == 'panend' or event.isfinal:
state = 'end'
# TODO: need to know which ones to flip
dx, dy = -event.dx, event.dy
self.logger.debug("pan gesture dx=%f dy=%f state=%s" % (
dx, dy, state))
return self.make_ui_callback('pan', state, dx, dy)
def swipe_event(self, event):
if event.isfinal:
state = 'end'
self.logger.debug("swipe gesture event=%s" % (str(event)))
## self.logger.debug("swipe gesture hdir=%s vdir=%s" % (
## hdir, vdir))
## return self.make_ui_callback('swipe', state, hdir, vdir)
def tap_event(self, event):
if event.isfinal:
state = 'end'
self.logger.debug("tap gesture event=%s" % (str(event)))
class ImageViewZoom(Mixins.UIMixin, ImageViewEvent):
# class variables for binding map and bindings can be set
bindmapClass = Bindings.BindingMapper
bindingsClass = Bindings.ImageViewBindings
@classmethod
def set_bindingsClass(cls, klass):
cls.bindingsClass = klass
@classmethod
def set_bindmapClass(cls, klass):
cls.bindmapClass = klass
def __init__(self, logger=None, rgbmap=None, settings=None,
bindmap=None, bindings=None):
ImageViewEvent.__init__(self, logger=logger, rgbmap=rgbmap,
settings=settings)
Mixins.UIMixin.__init__(self)
self.ui_setActive(True)
if bindmap is None:
bindmap = ImageViewZoom.bindmapClass(self.logger)
self.bindmap = bindmap
bindmap.register_for_events(self)
if bindings is None:
bindings = ImageViewZoom.bindingsClass(self.logger)
self.set_bindings(bindings)
def get_bindmap(self):
return self.bindmap
def get_bindings(self):
return self.bindings
def set_bindings(self, bindings):
self.bindings = bindings
bindings.set_bindings(self)
class CanvasView(ImageViewZoom):
def __init__(self, logger=None, settings=None, rgbmap=None,
bindmap=None, bindings=None):
ImageViewZoom.__init__(self, logger=logger, settings=settings,
rgbmap=rgbmap,
bindmap=bindmap, bindings=bindings)
# Needed for UIMixin to propagate events correctly
self.objects = [self.private_canvas]
def set_canvas(self, canvas, private_canvas=None):
super(CanvasView, self).set_canvas(canvas,
private_canvas=private_canvas)
self.objects[0] = self.private_canvas
class ImageViewCanvas(ImageViewZoom,
DrawingMixin, CanvasMixin, CompoundMixin):
def __init__(self, logger=None, rgbmap=None, settings=None,
bindmap=None, bindings=None):
ImageViewZoom.__init__(self, logger=logger,
rgbmap=rgbmap,
settings=settings,
bindmap=bindmap,
bindings=bindings)
CompoundMixin.__init__(self)
CanvasMixin.__init__(self)
DrawingMixin.__init__(self)
# we are both a viewer and a canvas
self.set_canvas(self, private_canvas=self)
self._mi = ModeIndicator(self)
#END
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