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# /*##########################################################################
#
# Copyright (c) 2019 European Synchrotron Radiation Facility
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# ###########################################################################*/
"""This script illustrates the update of a
:class:`~silx.gui.plot3d.SceneWindow.SceneWindow` widget from a thread.
The problem is that GUI methods should be called from the main thread.
To safely update the scene from another thread, one need to execute the update
asynchronously in the main thread.
In this example, this is achieved with
:func:`~silx.gui.utils.concurrent.submitToQtMainThread`.
In this example a thread calls submitToQtMainThread to append data to a 3D scatter.
"""
__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "08/03/2019"
import threading
import time
import numpy
from silx.gui import qt
from silx.gui.utils import concurrent
from silx.gui.plot3d.SceneWindow import SceneWindow
from silx.gui.plot3d import items
MAX_NUMBER_OF_POINTS = 10**6
class UpdateScatterThread(threading.Thread):
"""Thread updating the scatter 3D item data
:param ~silx.gui.plot3d.items.Scatter3D scatter3d: 3D scatter to update.
"""
def __init__(self, scatter3d):
self.scatter3d = scatter3d
self.running = False
self.future_result = None
super(UpdateScatterThread, self).__init__()
def start(self):
"""Start the update thread"""
self.running = True
super(UpdateScatterThread, self).start()
def _appendScatterData(self, x, y, z, value):
"""Add some data points to the Scatter3D item.
This method MUST be called in the Qt main thread.
:param numpy.ndarray x:
:param numpy.ndarray y:
:param numpy.ndarray z:
:param numpy.ndarray value:
"""
# use copy=False to avoid useless copy of numpy arrays
curX, curY, curZ, curValue = self.scatter3d.getData(copy=False)
x = numpy.append(curX, x)
y = numpy.append(curY, y)
z = numpy.append(curZ, z)
value = numpy.append(curValue, value)
# Update data
self.scatter3d.setData(x, y, z, value, copy=False)
def run(self):
"""Method implementing thread loop that updates the scatter data
It produces adds scatter points every 10 ms or so, up to 1 million.
"""
count = 0 # Number of data points currently rendered
# Init arrays that accumulate scatter points
x = numpy.array((), dtype=numpy.float32)
y = numpy.array((), dtype=numpy.float32)
z = numpy.array((), dtype=numpy.float32)
value = numpy.array((), dtype=numpy.float32)
while self.running:
time.sleep(0.01)
# Generate new data points
inclination = numpy.random.random(1000).astype(numpy.float32) * numpy.pi
azimuth = numpy.random.random(1000).astype(numpy.float32) * 2.0 * numpy.pi
radius = numpy.random.normal(loc=10.0, scale=0.5, size=1000)
newX = radius * numpy.sin(inclination) * numpy.cos(azimuth)
newY = radius * numpy.sin(inclination) * numpy.sin(azimuth)
newZ = radius * numpy.cos(inclination)
newValue = numpy.random.random(1000).astype(numpy.float32)
# Accumulate data points
x = numpy.append(x, newX)
y = numpy.append(y, newY)
z = numpy.append(z, newZ)
value = numpy.append(value, newValue)
# Only append data if the previous one has been added
if self.future_result is None or self.future_result.done():
if count > MAX_NUMBER_OF_POINTS:
# Restart a new scatter plot asyn
self.future_result = concurrent.submitToQtMainThread(
self.scatter3d.setData, x, y, z, value
)
count = len(x)
else:
# Append data asynchronously
self.future_result = concurrent.submitToQtMainThread(
self._appendScatterData, x, y, z, value
)
count += len(x)
# Reset accumulators
x = numpy.array((), dtype=numpy.float32)
y = numpy.array((), dtype=numpy.float32)
z = numpy.array((), dtype=numpy.float32)
value = numpy.array((), dtype=numpy.float32)
def stop(self):
"""Stop the update thread"""
self.running = False
self.join(2)
def main():
global app
app = qt.QApplication([])
# Create a SceneWindow
window = SceneWindow()
window.show()
sceneWidget = window.getSceneWidget()
scatter = items.Scatter3D()
scatter.setSymbol(",")
scatter.getColormap().setName("magma")
sceneWidget.addItem(scatter)
# Create the thread that calls submitToQtMainThread
updateThread = UpdateScatterThread(scatter)
updateThread.start() # Start updating the plot
app.exec()
updateThread.stop() # Stop updating the plot
if __name__ == "__main__":
main()
|
