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qt_plotting.py
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qt_plotting.py
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import logging
import os
import time
from threading import Thread
import numpy as np
import vtk
import vtk.qt
from pyvista.plotting import BasePlotter, rcParams, run_from_ipython
# for display bugs due to older intel integrated GPUs
vtk.qt.QVTKRWIBase = 'QGLWidget'
log = logging.getLogger(__name__)
log.setLevel('DEBUG')
# dummy reference for when PyQt5 is not installed (i.e. readthedocs)
has_pyqt = False
class QVTKRenderWindowInteractor(object):
pass
class RangeGroup(object):
pass
class QDialog(object):
pass
class QSlider(object):
pass
def pyqtSignal(*args, **kwargs): # pragma: no cover
pass
class QHBoxLayout(object):
pass
class QFileDialog(object):
pass
try:
from PyQt5.QtCore import pyqtSignal
from vtk.qt.QVTKRenderWindowInteractor import QVTKRenderWindowInteractor
from PyQt5 import QtGui
from PyQt5 import QtCore
from PyQt5.QtWidgets import (QMenuBar, QVBoxLayout, QHBoxLayout, QDoubleSpinBox,
QFrame, QMainWindow, QSlider,
QSpinBox, QHBoxLayout, QDialog,
QFormLayout, QGroupBox, QFileDialog)
has_pyqt = True
except ImportError: # pragma: no cover
pass
class FileDialog(QFileDialog):
"""
Generic file query that emits a signal when a file is selected and
the dialog was property closed.
"""
dlg_accepted = pyqtSignal(str)
def __init__(self, parent=None, filefilter=None, save_mode=True, show=True,
callback=None, directory=False):
super(FileDialog, self).__init__(parent)
if filefilter is not None:
self.setNameFilters(filefilter)
self.setOption(QFileDialog.DontUseNativeDialog)
self.accepted.connect(self.emit_accepted)
if directory:
self.FileMode(QFileDialog.DirectoryOnly)
self.setOption(QFileDialog.ShowDirsOnly, True)
if save_mode:
self.setAcceptMode(QFileDialog.AcceptSave)
if callback is not None:
self.dlg_accepted.connect(callback)
if show: # pragma: no cover
self.show()
def emit_accepted(self):
"""
Sends signal that the file dialog was closed properly.
Sends:
filename
"""
if self.result():
filename = self.selectedFiles()[0]
if os.path.isdir(os.path.dirname(filename)):
self.dlg_accepted.emit(filename)
class DoubleSlider(QSlider):
"""
Double precision slider from:
https://gist.github.com/dennis-tra/994a65d6165a328d4eabaadbaedac2cc
"""
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.decimals = 5
self._max_int = 10 ** self.decimals
super().setMinimum(0)
super().setMaximum(self._max_int)
self._min_value = 0.0
self._max_value = 20.0
@property
def _value_range(self):
return self._max_value - self._min_value
def value(self):
return float(super().value()) / self._max_int * self._value_range + self._min_value
def setValue(self, value):
super().setValue(int((value - self._min_value) / self._value_range * self._max_int))
def setMinimum(self, value):
if value > self._max_value: # pragma: no cover
raise ValueError("Minimum limit cannot be higher than maximum")
self._min_value = value
self.setValue(self.value())
def setMaximum(self, value):
if value < self._min_value: # pragma: no cover
raise ValueError("Minimum limit cannot be higher than maximum")
self._max_value = value
self.setValue(self.value())
class RangeGroup(QHBoxLayout):
def __init__(self, parent, callback, minimum=0.0, maximum=20.0,
value=1.0):
super(RangeGroup, self).__init__(parent)
self.slider = DoubleSlider(QtCore.Qt.Horizontal)
self.slider.setTickInterval(0.1)
self.slider.setMinimum(minimum)
self.slider.setMaximum(maximum)
self.slider.setValue(value)
self.minimum = minimum
self.maximum = maximum
self.spinbox = QDoubleSpinBox(value=value, minimum=minimum,
maximum=maximum, decimals=4)
self.addWidget(self.slider)
self.addWidget(self.spinbox)
# Connect slider to spinbox
self.slider.valueChanged.connect(self.update_spinbox)
self.spinbox.valueChanged.connect(self.update_value)
self.spinbox.valueChanged.connect(callback)
def update_spinbox(self, value):
self.spinbox.setValue(self.slider.value())
def update_value(self, value):
# if self.spinbox.value() < self.minimum:
# self.spinbox.setValue(self.minimum)
# elif self.spinbox.value() > self.maximum:
# self.spinbox.setValue(self.maximum)
self.slider.blockSignals(True)
self.slider.setValue(self.spinbox.value())
self.slider.blockSignals(False)
@property
def value(self):
return self.spinbox.value()
@value.setter
def value(self, new_value):
self.slider.setValue(new_value)
class ScaleAxesDialog(QDialog):
""" Dialog to control axes scaling """
accepted = pyqtSignal(float)
signal_close = pyqtSignal()
def __init__(self, parent, plotter, show=True):
super(ScaleAxesDialog, self).__init__(parent)
self.setGeometry(300, 300, 50, 50)
self.setMinimumWidth(500)
self.signal_close.connect(self.close)
self.plotter = plotter
self.x_slider_group = RangeGroup(parent, self.update_scale,
value=plotter.scale[0])
self.y_slider_group = RangeGroup(parent, self.update_scale,
value=plotter.scale[1])
self.z_slider_group = RangeGroup(parent, self.update_scale,
value=plotter.scale[2])
form_layout = QFormLayout(self)
form_layout.addRow('X Scale', self.x_slider_group)
form_layout.addRow('Y Scale', self.y_slider_group)
form_layout.addRow('Z Scale', self.z_slider_group)
self.setLayout(form_layout)
if show: # pragma: no cover
self.show()
def update_scale(self, value):
""" updates the scale of all actors in the plotter """
self.plotter.set_scale(self.x_slider_group.value,
self.y_slider_group.value,
self.z_slider_group.value)
def resample_image(arr, max_size=400):
"""Resamples a square image to an image of max_size"""
dim = np.max(arr.shape[0:2])
if dim < max_size:
max_size = dim
x, y, _ = arr.shape
sx = int(np.ceil(x / max_size))
sy = int(np.ceil(y / max_size))
img = np.zeros((max_size, max_size, 3), dtype=arr.dtype)
arr = arr[0:-1:sx, 0:-1:sy, :]
xl = (max_size - arr.shape[0]) // 2
yl = (max_size - arr.shape[1]) // 2
img[xl:arr.shape[0]+xl, yl:arr.shape[1]+yl, :] = arr
return img
def pad_image(arr, max_size=400):
"""Pads an image to a square then resamples to max_size"""
dim = np.max(arr.shape)
img = np.zeros((dim, dim, 3), dtype=arr.dtype)
xl = (dim - arr.shape[0]) // 2
yl = (dim - arr.shape[1]) // 2
img[xl:arr.shape[0]+xl, yl:arr.shape[1]+yl, :] = arr
return resample_image(img, max_size=max_size)
class QtInteractor(QVTKRenderWindowInteractor, BasePlotter):
"""
Extends QVTKRenderWindowInteractor class by adding the methods
available to pyvista.Plotter.
Parameters
----------
parent :
title : string, optional
Title of plotting window.
"""
render_trigger = pyqtSignal()
allow_quit_keypress = True
signal_close = pyqtSignal()
def __init__(self, parent=None, title=None, shape=(1, 1), **kwargs):
""" Initialize Qt interactor """
if not has_pyqt:
raise AssertionError('Requires PyQt5')
QVTKRenderWindowInteractor.__init__(self, parent)
BasePlotter.__init__(self, shape=shape)
self.parent = parent
# Create and start the interactive renderer
self.ren_win = self.GetRenderWindow()
for renderer in self.renderers:
self.ren_win.AddRenderer(renderer)
self.iren = self.ren_win.GetInteractor()
self.background_color = rcParams['background']
if title:
self.setWindowTitle(title)
self.iren.RemoveObservers('MouseMoveEvent') # slows window update?
self.iren.Initialize()
# Enter trackball camera mode
istyle = vtk.vtkInteractorStyleTrackballCamera()
self.SetInteractorStyle(istyle)
self.add_axes()
# QVTKRenderWindowInteractor doesn't have a "q" quit event
self.iren.AddObserver("KeyPressEvent", self.key_quit)
def key_quit(self, obj=None, event=None): # pragma: no cover
try:
key = self.iren.GetKeySym().lower()
if key == 'q' and self.allow_quit_keypress:
self.quit()
except:
pass
def quit(self):
self.iren.TerminateApp()
self.close()
self.signal_close.emit()
class BackgroundPlotter(QtInteractor):
ICON_TIME_STEP = 5.0
def __init__(self, show=True, app=None, shape=(1, 1), window_size=None, **kwargs):
if not has_pyqt:
raise AssertionError('Requires PyQt5')
self.active = True
self.saved_camera_positions = []
if window_size is None:
window_size = rcParams['window_size']
# Remove notebook argument in case user passed it
kwargs.pop('notebook', None)
# ipython magic
if run_from_ipython(): # pragma: no cover
from IPython import get_ipython
ipython = get_ipython()
ipython.magic('gui qt')
from IPython.external.qt_for_kernel import QtGui
QtGui.QApplication.instance()
# run within python
if app is None:
from PyQt5.QtWidgets import QApplication
app = QApplication.instance()
if not app: # pragma: no cover
app = QApplication([''])
self.app = app
self.app_window = QMainWindow()
self.frame = QFrame()
self.frame.setFrameStyle(QFrame.NoFrame)
QtInteractor.__init__(self, parent=self.frame, shape=shape, **kwargs)
self.signal_close.connect(self.app_window.close)
# build main menu
main_menu = self.app_window.menuBar()
file_menu = main_menu.addMenu('File')
file_menu.addAction('Take Screenshot', self._qt_screenshot)
file_menu.addAction('Export as VTKjs', self._qt_export_vtkjs)
file_menu.addSeparator()
file_menu.addAction('Exit', self.quit)
view_menu = main_menu.addMenu('View')
view_menu.addAction('Toggle Eye Dome Lighting', self._toggle_edl)
view_menu.addAction('Scale Axes', self.scale_axes_dialog)
view_menu.addAction('Clear All', self.clear)
cam_menu = view_menu.addMenu('Camera')
cam_menu.addAction('Reset Camera', self.reset_camera)
cam_menu.addAction('Isometric View', self.view_isometric)
cam_menu.addAction('View XY Plane', self.view_xy)
cam_menu.addAction('View XZ Plane', self.view_xz)
cam_menu.addAction('View YZ Plane', self.view_yz)
cam_menu.addSeparator()
cam_menu.addAction('Save Current Camera Position', self.save_camera_position)
cam_menu.addAction('Clear Saved Positions', self.clear_camera_positions)
view_menu.addSeparator()
# Orientation marker
orien_menu = view_menu.addMenu('Orientation Marker')
orien_menu.addAction('Show', self.show_axes)
orien_menu.addAction('Hide', self.hide_axes)
# Bounds axes
axes_menu = view_menu.addMenu('Bounds Axes')
axes_menu.addAction('Add Bounds Axes (front)', self.show_bounds)
axes_menu.addAction('Add Bounds Grid (back)', self.show_grid)
axes_menu.addAction('Add Bounding Box', self.add_bounding_box)
axes_menu.addSeparator()
axes_menu.addAction('Remove Bounding Box', self.remove_bounding_box)
axes_menu.addAction('Remove Bounds', self.remove_bounds_axes)
# A final separator to seperate OS options
view_menu.addSeparator()
self.saved_camera_menu = main_menu.addMenu('Camera Positions')
vlayout = QVBoxLayout()
vlayout.addWidget(self)
self.frame.setLayout(vlayout)
self.app_window.setCentralWidget(self.frame)
if show: # pragma: no cover
self.app_window.show()
self.show()
self._spawn_background_rendering()
self.window_size = window_size
self._last_update_time = time.time() - BackgroundPlotter.ICON_TIME_STEP / 2
self._last_window_size = self.window_size
self._last_camera_pos = self.camera_position
def scale_axes_dialog(self, show=True):
""" Open scale axes dialog """
return ScaleAxesDialog(self.app_window, self, show=show)
def clear_camera_positions(self):
""" clears all camera positions """
for action in self.saved_camera_menu.actions():
self.saved_camera_menu.removeAction(action)
def save_camera_position(self):
""" Saves camera position to saved camera menu for recall """
self.saved_camera_positions.append(self.camera_position)
ncam = len(self.saved_camera_positions)
camera_position = self.camera_position[:] # py2.7 copy compatibility
def load_camera_position():
self.camera_position = camera_position
self.saved_camera_menu.addAction('Camera Position %2d' % ncam,
load_camera_position)
def _spawn_background_rendering(self, rate=5.0):
"""
Spawns a thread that updates the render window.
Sometimes directly modifiying object data doesn't trigger
Modified() and upstream objects won't be updated. This
ensures the render window stays updated without consuming too
many resources.
"""
self.render_trigger.connect(self.ren_win.Render)
twait = rate**-1
def render():
while self.active:
time.sleep(twait)
self._render()
self.render_thread = Thread(target=render)
self.render_thread.start()
def closeEvent(self, event):
self.active = False
self.app.quit()
self.close()
def add_actor(self, actor, reset_camera=None, name=None, loc=None, culling=False):
actor, prop = super(BackgroundPlotter, self).add_actor(actor,
reset_camera,
name,
loc)
self.update_app_icon()
return actor, prop
def update_app_icon(self):
"""
Update the app icon if the user is not trying to resize the window.
"""
if os.name == 'nt' or not hasattr(self, '_last_window_size'): # pragma: no cover
# DO NOT EVEN ATTEMPT TO UPDATE ICON ON WINDOWS
return
cur_time = time.time()
if self._last_window_size != self.window_size: # pragma: no cover
# Window size hasn't remained constant since last render.
# This means the user is resizing it so ignore update.
pass
elif ((cur_time - self._last_update_time > BackgroundPlotter.ICON_TIME_STEP)
and self._last_camera_pos != self.camera_position):
# its been a while since last update OR
# the camera position has changed and its been at leat one second
# Update app icon as preview of the window
img = pad_image(self.image)
qimage = QtGui.QImage(img.copy(), img.shape[1],
img.shape[0], QtGui.QImage.Format_RGB888)
icon = QtGui.QIcon(QtGui.QPixmap.fromImage(qimage))
self.app.setWindowIcon(icon)
# Update trackers
self._last_update_time = cur_time
self._last_camera_pos = self.camera_position
# Update trackers
self._last_window_size = self.window_size
def _qt_screenshot(self, show=True):
return FileDialog(self.app_window,
filefilter=['Image File (*.png)',
'JPEG (*.jpeg)'],
show=show,
directory=os.getcwd(),
callback=self.screenshot)
def _qt_export_vtkjs(self, show=True):
"""
Spawn an save file dialog to export a vtkjs file.
"""
return FileDialog(self.app_window,
filefilter=['VTK JS File(*.vtkjs)'],
show=show,
directory=os.getcwd(),
callback=self.export_vtkjs)
def _toggle_edl(self):
if hasattr(self.renderer, 'edl_pass'):
return self.renderer.disable_eye_dome_lighting()
return self.renderer.enable_eye_dome_lighting()
def _render(self):
super(BackgroundPlotter, self)._render()
self.update_app_icon()
return
@property
def window_size(self):
""" returns render window size """
the_size = self.app_window.baseSize()
return the_size.width(), the_size.height()
@window_size.setter
def window_size(self, window_size):
""" set the render window size """
BasePlotter.window_size.fset(self, window_size)
self.app_window.setBaseSize(*window_size)
def __del__(self): # pragma: no cover
self.close()