/usr/lib/python3/dist-packages/ginga/mplw/ImageViewMpl.py is in python3-ginga 2.6.1-2.
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# ImageViewMpl.py -- a backend for Ginga using a Matplotlib figure
#
# This is open-source software licensed under a BSD license.
# Please see the file LICENSE.txt for details.
import sys, re
import numpy
import threading
import math
from io import BytesIO
# Matplotlib imports
import matplotlib
from matplotlib.image import FigureImage
from matplotlib.figure import Figure
import matplotlib.lines as lines
#from matplotlib.path import Path
from ginga import ImageView
from ginga import Mixins, Bindings, colors
from . import transform
from ginga.mplw.CanvasRenderMpl import CanvasRenderer
from ginga.mplw.MplHelp import Timer
# Override some matplotlib keyboard UI defaults
rc = matplotlib.rcParams
# TODO: figure out how to keep from overriding the user's desirable
# rcParams
rc.update(matplotlib.rcParamsDefault)
rc['keymap.fullscreen'] = 'f' # toggling full screen
rc['keymap.home'] = 'home' # home or reset mnemonic
rc['keymap.back'] = 'left' # forward / backward keys to enable
rc['keymap.forward'] = 'right' # left handed quick navigation
rc['keymap.pan'] = [] # pan mnemonic
rc['keymap.zoom'] = [] # zoom mnemonic
rc['keymap.save'] = 'ctrl+s' # saving current figure
#rc['keymap.quit'] = 'ctrl+w' # close the current figure
rc['keymap.grid'] = 'ctrl+g' # switching on/off a grid in current axes
rc['keymap.yscale'] = [] # toggle scaling of y-axes ('log'/'linear')
rc['keymap.xscale'] = [] # toggle scaling of x-axes ('log'/'linear')
rc['keymap.all_axes'] = [] # enable all axes
class ImageViewMplError(ImageView.ImageViewError):
pass
class ImageViewMpl(ImageView.ImageViewBase):
def __init__(self, logger=None, rgbmap=None, settings=None):
ImageView.ImageViewBase.__init__(self, logger=logger,
rgbmap=rgbmap,
settings=settings)
# Our Figure
self.figure = None
# Our Axes
self.ax_img = None
self.ax_util = None
# Holds the image on ax_img
self.mpimage = None
# NOTE: matplotlib manages it's Y coordinates by default with
# the origin at the bottom (see base class)
self._originUpper = False
self.img_fg = (1.0, 1.0, 1.0)
self.img_bg = (0.5, 0.5, 0.5)
self.in_axes = False
# Matplotlib expects RGBA data for color images
self._rgb_order = 'RGBA'
self.renderer = CanvasRenderer(self)
# For timing events
self._msg_timer = None
self._defer_timer = None
def set_figure(self, figure):
"""Call this with the matplotlib Figure() object."""
self.figure = figure
ax = self.figure.add_axes((0, 0, 1, 1), frame_on=False)
#ax = fig.add_subplot(111)
self.ax_img = ax
# We don't want the axes cleared every time plot() is called
ax.hold(False)
# TODO: is this needed, since frame_on == False?
ax.get_xaxis().set_visible(False)
ax.get_yaxis().set_visible(False)
#ax.patch.set_alpha(0.0)
ax.patch.set_visible(False)
#ax.autoscale(enable=True, tight=True)
ax.autoscale(enable=False)
# Add an overlapped axis for drawing graphics
newax = self.figure.add_axes(self.ax_img.get_position(),
sharex=ax, sharey=ax,
frameon=False)
newax.hold(True)
newax.autoscale(enable=False)
newax.get_xaxis().set_visible(False)
newax.get_yaxis().set_visible(False)
self.ax_util = newax
# Create timers
self._msg_timer = None
self._defer_timer = None
if hasattr(figure.canvas, 'new_timer'):
self._msg_timer = Timer(0.0,
lambda timer: self.onscreen_message(None),
mplcanvas=figure.canvas)
self._defer_timer = Timer(0.0,
lambda timer: self.delayed_redraw(),
mplcanvas=figure.canvas)
canvas = figure.canvas
if hasattr(canvas, 'viewer'):
canvas.set_viewer(self)
else:
canvas.mpl_connect("resize_event", self._resize_cb)
# Because we don't know if resize callback works with all backends
left, bottom, wd, ht = self.ax_img.bbox.bounds
self.configure_window(wd, ht)
def get_figure(self):
return self.figure
def set_widget(self, canvas):
if hasattr(canvas, 'viewer'):
canvas.set_viewer(self)
def get_widget(self):
return self.figure.canvas
def get_rgb_order(self):
return self._rgb_order
def calculate_aspect(self, shape, extent):
dx = abs(extent[1] - extent[0]) / float(shape[1])
dy = abs(extent[3] - extent[2]) / float(shape[0])
return dx / dy
def render_image1(self, rgbobj, dst_x, dst_y):
"""Render the image represented by (rgbobj) at dst_x, dst_y
in the pixel space.
NOTE: this version uses a Figure.FigImage to render the image.
"""
self.logger.debug("redraw surface")
if self.figure is None:
return
## left, bottom, width, height = self.ax_img.bbox.bounds
## self._imgwin_wd, self._imgwin_ht = width, height
# Grab the RGB array for the current image and place it in the
# matplotlib figure axis
data = self.getwin_array(order=self._rgb_order)
dst_x = dst_y = 0
# fill background color
## rect = self.figure.patch
## rect.set_facecolor(self.img_bg)
# attempt 1: using a FigureImage (non-scaled)
if self.mpimage is None:
self.mpimage = self.figure.figimage(data, xo=dst_x, yo=dst_y,
origin='upper')
else:
# note: this is not a typo--these offsets have a different
# attribute name than in the constructor ('ox' vs. 'xo')
self.mpimage.ox = dst_x
self.mpimage.oy = dst_y
self.mpimage.set_data(data)
def render_image2(self, rgbobj, dst_x, dst_y):
"""Render the image represented by (rgbobj) at dst_x, dst_y
in the pixel space.
NOTE: this version renders the image in an Axes with imshow().
"""
self.logger.debug("redraw surface")
if self.figure is None:
return
## left, bottom, width, height = self.ax_img.bbox.bounds
## self._imgwin_wd, self._imgwin_ht = width, height
# Grab the RGB array for the current image and place it in the
# matplotlib figure axis
arr = self.getwin_array(order=self._rgb_order)
# Get the data extents
x0, y0 = 0, 0
y1, x1 = arr.shape[:2]
flipx, flipy, swapxy = self.get_transforms()
if swapxy:
x0, x1, y0, y1 = y0, y1, x0, x1
extent = (x0, x1, y1, y0)
self.logger.debug("extent=%s" % (str(extent)))
# Calculate aspect ratio
aspect = self.calculate_aspect(arr.shape, extent)
if self.mpimage is None:
img = self.ax_img.imshow(arr, interpolation='none',
origin="upper",
vmin=0, vmax=255,
extent=extent,
aspect=aspect)
self.mpimage = img
else:
self.mpimage.set_data(arr)
self.ax_img.set_aspect(aspect)
self.mpimage.set_extent(extent)
#self.ax_img.relim()
def render_image(self, rgbobj, dst_x, dst_y):
# Ugly, ugly hack copied from matplotlib.lines to cause line
# objects to recompute their cached transformed_path
# Other mpl artists don't seem to have this affliction
for ax in self.figure.axes:
if not (ax in (self.ax_img, self.ax_util)):
if hasattr(ax, "lines"):
for line in ax.lines:
try:
line._transformed_path.invalidate()
except AttributeError:
pass
# render_image1() currently seems a little faster
if self.in_axes:
self.render_image2(rgbobj, dst_x, dst_y)
else:
self.render_image1(rgbobj, dst_x, dst_y)
# clear utility axis
self.ax_util.cla()
# force an update of the figure
self.figure.canvas.draw()
# Set the axis limits
# TODO: should we do this only for those who have autoaxis=True?
## wd, ht = self.get_window_size()
## x0, y0 = self.get_data_xy(0, 0)
## x1, tm = self.get_data_xy(wd-1, 0)
## tm, y1 = self.get_data_xy(0, ht-1)
## for ax in self.figure.axes:
## ax.set_xlim(x0, x1)
## ax.set_ylim(y0, y1)
def configure_window(self, width, height):
self.configure(width, height)
def _resize_cb(self, event):
wd, ht = event.width, event.height
self.logger.debug("canvas resized %dx%d" % (wd, ht))
self.configure_window(wd, ht)
def add_axes(self):
ax = self.figure.add_axes(self.ax_img.get_position(),
#sharex=self.ax_img, sharey=self.ax_img,
frameon=False,
viewer=self,
projection='ginga')
ax.get_xaxis().set_visible(False)
ax.get_yaxis().set_visible(False)
return ax
def get_png_image_as_buffer(self, output=None):
ibuf = output
if ibuf is None:
ibuf = BytesIO()
qimg = self.figure.write_to_png(ibuf)
return ibuf
def update_image(self):
pass
def set_cursor(self, cursor):
pass
def onscreen_message(self, text, delay=None, redraw=True):
if self._msg_timer is not None:
self._msg_timer.cancel()
self.set_onscreen_message(text, redraw=redraw)
if self._msg_timer is not None and delay is not None:
self._msg_timer.start(delay)
def reschedule_redraw(self, time_sec):
if self._defer_timer is None:
self.delayed_redraw()
return
self._defer_timer.cancel()
self._defer_timer.start(time_sec)
class ImageViewEvent(ImageViewMpl):
def __init__(self, logger=None, rgbmap=None, settings=None):
ImageViewMpl.__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)
# @$%&^(_)*&^ gnome!!
self._keytbl = {
'shift': 'shift_l',
'control': 'control_l',
'alt': 'alt_l',
'win': 'super_l',
'`': 'backquote',
'"': 'doublequote',
"'": 'singlequote',
'\\': 'backslash',
' ': 'space',
# NOTE: not working
'escape': 'escape',
'enter': 'return',
# NOTE: not working
'tab': 'tab',
# NOTE: all Fn keys not working
'f1': 'f1',
'f2': 'f2',
'f3': 'f3',
'f4': 'f4',
'f5': 'f5',
'f6': 'f6',
'f7': 'f7',
'f8': 'f8',
'f9': 'f9',
'f10': 'f10',
'f11': 'f11',
'f12': 'f12',
}
# Define cursors for pick and pan
#hand = openHandCursor()
hand = 0
self.define_cursor('pan', hand)
#cross = thinCrossCursor('aquamarine')
cross = 1
self.define_cursor('pick', cross)
for name in ('motion', 'button-press', 'button-release',
'key-press', 'key-release', 'drag-drop',
'scroll', 'map', 'focus', 'enter', 'leave',
):
self.enable_callback(name)
def set_figure(self, figure):
super(ImageViewEvent, self).set_figure(figure)
connect = figure.canvas.mpl_connect
#connect("map_event", self.map_event)
#connect("focus_in_event", self.focus_event, True)
#connect("focus_out_event", self.focus_event, False)
connect("figure_enter_event", self.enter_notify_event)
connect("figure_leave_event", self.leave_notify_event)
#connect("axes_enter_event", self.enter_notify_event)
#connect("axes_leave_event", self.leave_notify_event)
connect("motion_notify_event", self.motion_notify_event)
connect("button_press_event", self.button_press_event)
connect("button_release_event", self.button_release_event)
connect("key_press_event", self.key_press_event)
connect("key_release_event", self.key_release_event)
connect("scroll_event", self.scroll_event)
# TODO: drag-drop event
def transkey(self, keyname):
self.logger.debug("matplotlib keyname='%s'" % (keyname))
if keyname is None:
return keyname
try:
return self._keytbl[keyname.lower()]
except KeyError:
return keyname
def get_keyTable(self):
return self._keytbl
def set_enter_focus(self, tf):
self.enter_focus = tf
def focus_event(self, event, hasFocus):
return self.make_callback('focus', hasFocus)
def enter_notify_event(self, event):
if self.enter_focus:
self.focus_event(event, True)
return self.make_callback('enter')
def leave_notify_event(self, event):
self.logger.debug("leaving widget...")
if self.enter_focus:
self.focus_event(event, False)
return self.make_callback('leave')
def key_press_event(self, event):
keyname = event.key
keyname = self.transkey(keyname)
if keyname is not None:
self.logger.debug("key press event, key=%s" % (keyname))
return self.make_ui_callback('key-press', keyname)
def key_release_event(self, event):
keyname = event.key
keyname = self.transkey(keyname)
if keyname is not None:
self.logger.debug("key release event, key=%s" % (keyname))
return self.make_ui_callback('key-release', keyname)
def button_press_event(self, event):
x, y = event.x, event.y
self.last_win_x, self.last_win_y = x, y
button = 0
if event.button in (1, 2, 3):
button |= 0x1 << (event.button - 1)
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):
x, y = event.x, event.y
self.last_win_x, self.last_win_y = x, y
button = 0
if event.button in (1, 2, 3):
button |= 0x1 << (event.button - 1)
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
x, y = event.x, event.y
self.last_win_x, self.last_win_y = x, y
if event.button in (1, 2, 3):
button |= 0x1 << (event.button - 1)
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
self.logger.debug("motion event at DATA %dx%d" % (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
self.last_win_x, self.last_win_y = x, y
# Matplotlib only gives us the number of steps of the scroll,
# positive for up and negative for down. No horizontal scrolling.
direction = None
if event.step > 0:
direction = 0.0
elif event.step < 0:
direction = 180.0
amount = abs(event.step) * 15.0
self.logger.debug("scroll deg=%f direction=%f" % (
amount, 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, amount,
data_x, data_y)
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
#END
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