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trackingtarget.py
1"""Tracking target example of the PST SDK
2
3 This example shows how to work with tracking targets using the PST SDK.
4 Note that at this moment tracking targets can not be trained or
5 imported using the PST SDK. In order to add new tracking targets, please
6 use the PST Client together with the pstech.pstsdk.tracker.Tracker.enable_shared_memory()
7 function, or use the stand-alone PST Server to configure the tracking targets.
8
9 Copyright PS-Tech B.V. All Rights Reserved.
10"""
11 import context
12 import time
13 import sys
14 import pstech.pstsdk.tracker as pst
15 import pstech.pstsdk.errors as psterrors
16
17# Control variable for main loop
18running = True
19
20# Number of data points to grab before application termination
21max_samples = 100
22
23# Global number of samples
24samples = 0
25
26"""Implementation of the pst.Listener class to receive tracking data and mode changes."""
27 class MyListener(pst.Listener):
28
29 """Implementation of a tracker data callback function
30
31 Implementation of a tracker data callback function. The on_tracker_data
32 function receives the data as soon as it becomes available.
33
34 Args:
35 tracker_data: Object containing tracking information retrieved from tracker
36 status_message: Status message reported by the tracker.
37
38 See Also:
39 pstech.pstdk.trackerdata.TrackerData
40 pstech.pstsdk.errors.EStatusMessage
41 """
42 def on_tracker_data(self, tracker_data, status_message):
43 # Do something with the tracker data
44 global samples
45 global running
46
47 if samples >= max_samples:
48 running = False
49
50 for target_pose in tracker_data.targetlist:
51 print("Detected " + target_pose.name)
52
53 samples += 1
54
55"""Helper function to register the exit handler with the application"""
56 def register_exit_handler():
57 if sys.platform.startswith("linux"):
58 import signal
59 signal.signal(signal.SIGTERM, exit_handler)
60 signal.signal(signal.SIGHUP, exit_handler)
61 signal.signal(signal.SIGQUIT, exit_handler)
62 signal.signal(signal.SIGINT, exit_handler)
63 elif sys.platform.startswith("win"):
64 import win32api
65 win32api.SetConsoleCtrlHandler(exit_handler, True)
66
67"""Implement the exit handler to shut-down the PST Tracker connection on application termination."""
68 def exit_handler(*args):
69 global running
70 pst.Tracker.shutdown()
71 running = False
72 return True
73
74 def main():
75 if(len(sys.argv) < 2):
76 print("\nConfiguration Error: A camera configuration file needs to be specified. This file can be found in the Redist folder of your installation. "
77 "See the documentation of the Python bindings for more information.")
78 exit(0)
79
80 # Register exit_handler for proper shutdown
81 register_exit_handler()
82
83 try:
84 # Use Context Manager to prevent improper Tracker shutdown on errors.
85 # Create an instance of the Tracker object using the default configuration path and file names.
86 with pst.Tracker("", "","", sys.argv[1]) as tracker:
87
88 # Print version number of the tracker server being used.
89 print("Running PST Server version " + tracker.get_version_info())
90
91 # Create listener with callback functions for data and/or mode updates.
92 listener = MyListener()
93
94 # Register the listener object to the tracker server.
95 tracker.add_tracker_listener(listener)
96
97 print("Put the Reference card in front of the PST in order to see tracking results.\n")
98
99 # Start the tracker server.
100 tracker.start()
101
102 # Perform a system check to see if the tracker server is running OK and print the result.
103 print("System check: " + str(tracker.system_check()))
104
105 # Retrieve the list of registered tracking targets and print their names and current status (active or not).
106 targets = tracker.get_target_list()
107 print("Found " + str(len(targets)) + " tracking targets:")
108 for target_status in targets:
109 print(target_status.name + "\t" + str(target_status.status))
110 print("")
111
112 # Enable the Reference target. Note that this will cause a TrackerError in case the Reference
113 # target has not been created. The Reference target can be created using the PST Client.
114 tracker.set_target_status("Reference", True)
115
116 # Get the 3D marker positions making up the Reference device and display them.
117 # Note that this will cause a TrackerError in case the Reference target has not been created.
118 markers_list = tracker.get_target_markers("Reference")
119 print("3D marker positions making up the Reference target:")
120 for marker in markers_list:
121 print("x: " + str(marker[0]) + "\ty: " + str(marker[1]) + "\tz: " + str(marker[2]))
122 print("")
123
124 # Main loop, wait for auto-termination.
125 while running:
126 time.sleep(0.1)
127
128 except psterrors.TrackerError as err:
129 # Catch TrackerError exceptions and print error messages.
130 print(err.message)
131
132 if __name__ == "__main__":
133 main()
pstech.pstsdk.errors
Module containing all error related classes and functions.
Definition errors.py:1
pstech.pstsdk.tracker
Module containing all tracker related classes and functions.
Definition tracker.py:1