multitouch/src/tuio_server.py

#!/usr/bin/env python
from OSC import OSCServer
OSCServer.print_tracebacks = True

from logger import Logger


class TuioServer2D(Logger):
    __tuio_address__ = 'localhost', 3333

    def __init__(self, handler_obj):
        # OSC server that listens to incoming TUIO events
        self.server = OSCServer(self.__tuio_address__)
        self.server.addDefaultHandlers()
        self.server.addMsgHandler('/tuio/2Dobj', self._receive)
        self.server.addMsgHandler('/tuio/2Dcur', self._receive)
        self.server.addMsgHandler('/tuio/2Dblb', self._receive)

        # List of alive seddion id's
        self.alive = set()

        # List of session id's of points that have generated a 'point_down'
        # event
        self.down = set()

        self.handler_obj = handler_obj

    def _receive(self, addr, tags, data, source):
        surface = addr[8:]
        #self.debug('Received message <surface=%s tags="%s" '
        #           'data=%s source=%s>' % (surface, tags, data, source))
        msg_type = data[0]

        # FIXME: Ignore obj/blb events?
        if surface != 'cur':
            return

        if msg_type == 'alive':
            alive = set(data[1:])
            released = self.alive - alive
            self.alive = alive

            if released:
                self.debug('Released %s.' % ', '.join(map(str, released)))
                self.down -= released

            for sid in released:
                self.handler_obj.on_point_up(sid)
        elif msg_type == 'set':
            sid, x, y = data[1:4]

            if sid not in self.alive:
                raise ValueError('Point with sid "%d" is not alive.' % sid)

            # Check if 'point_down' has already been triggered. If so, trigger
            # a 'point_move' event instead
            if sid in self.down:
                self.debug('Moved %d to (%s, %s).' % (sid, x, y))
                self.handler_obj.on_point_move(sid, x, y)
            else:
                self.debug('Down %d at (%s, %s).' % (sid, x, y))
                self.down.add(sid)
                self.handler_obj.on_point_down(sid, x, y)

    def start(self):
        try:
            self.info('Starting OSC server')
            self.server.serve_forever()
        except SystemExit:
            self.stop()

    def stop(self):
        self.info('Stopping OSC server')
        self.server.close()


class TuioServerHandler(object):
    """
    Interface for touch servers. Defines point_up, point_move and point_down
    handlers.
    """
    def on_point_down(self, sid, x, y):
        return NotImplemented

    def on_point_move(self, sid, x, y):
        return NotImplemented

    def on_point_up(self, sid):
        return NotImplemented


if __name__ == '__main__':
    import argparse
    import logging

    parser = argparse.ArgumentParser(description='TUIO server test.')
    parser.add_argument('--log', metavar='LOG_LEVEL', default='INFO',
            choices=['DEBUG', 'INFO', 'WARNING'], help='Global log level.')
    parser.add_argument('--logfile', metavar='FILENAME', help='Filename for '
            'the log file (the log is printed to stdout by default).')
    args = parser.parse_args()

    # Configure logger
    log_config = dict(level=getattr(logging, args.log))

    if args.logfile:
        log_config['filename'] = args.logfile

    Logger.configure(**log_config)

    # Define handlers
    class Handler(TuioServerHandler, Logger):
        def on_point_down(self, sid, x, y):
            self.info('Point down: sid=%d (%s, %s)' % (sid, x, y))

        def on_point_up(self, sid):
            self.info('Point up: sid=%d' % sid)

        def on_point_move(self, sid, x, y):
            self.info('Point move: sid=%d (%s, %s)' % (sid, x, y))

    server = TuioServer2D(Handler())

    try:
        server.start()
    except KeyboardInterrupt:
        server.stop()