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# This is a CamiTK python action
#
# Test the interaction between python and the CamiTK application using 'self' and a timer.
# This is a simple test where a counter is incremented in the tick() method called by a
# timer() that lives in Python.
# It demonstrates how state can be preserved between two timer ticks calls using internal
# variables.
#
# Click 'Start'/'Stop' to start/stop the timer. Note that the timer interval is slowed
# down/accelerated automatically within the tick() method.
# Note also that the parameter is set to 'read only' as a way to prove the internal
# self.counter increments properly.
import camitk
from PySide2.QtCore import QTimer
def tick(self:camitk.Action):
self.counter += 1
camitk.info(f"counter: {self.counter}")
# Backup state C++ memory is required as self.counter has changed in a
# method that is not called directly from C++ (init, process, targetDefined, parameterChanged),
# i.e., a function called from python by python.
# This is required to ensure the C++/python values are properly synchronized
self.saveState()
# call to set ParameterValue must be done _after_ saveState()
self.setParameterValue("Counter", self.counter)
self.timer.setInterval(int(1000.0 / float(self.counter%10 + 1)))
# update action (default) widget
self.updateWidget()
def init(self:camitk.Action):
self.timer = None
self.setApplyButtonText("Start")
def process(self:camitk.Action):
self.counter = self.getParameterValue("Counter")
if not self.timer:
self.timer = QTimer()
connected = self.timer.timeout.connect(lambda: tick(self))
if not self.timer.isActive():
self.setApplyButtonText("Stop")
self.timer.start(1000)
else:
self.setApplyButtonText("Restart")
self.timer.stop()
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