fgdata/Aircraft/c172p/Systems/control-lock.xml

<?xml version="1.0" encoding="UTF-8"?>

<!--
    Copyright (c) 2016 onox

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-->

<PropertyList>

    <filter>
        <name>Control Lock Aileron</name>
        <type>noise-spike</type>
        <max-rate-of-change>1.0</max-rate-of-change>
        <enable>
            <property>/controls/flight/freeze-yoke</property>
        </enable>
        <input>
            <property>/controls/flight/aileron-cmd</property>
        </input>
        <output>
            <property>/controls/flight/aileron</property>
        </output>
    </filter>

    <filter>
        <name>Control Lock Elevator</name>
        <type>noise-spike</type>
        <max-rate-of-change>1.0</max-rate-of-change>
        <enable>
            <property>/controls/flight/freeze-yoke</property>
        </enable>
        <input>
            <property>/controls/flight/elevator-cmd</property>
        </input>
        <output>
            <property>/controls/flight/elevator</property>
        </output>
    </filter>

    <state-machine>
        <branch>/aircraft/fsm/control-lock</branch>

        <!-- States -->
        <state>
            <name>unlocked</name>

            <enter>
                <command>property-assign</command>
                <property>/sim/model/c172p/cockpit/control-lock-visible</property>
                <value type="bool">false</value>
            </enter>
            <enter>
                <command>property-assign</command>
                <property>/controls/flight/freeze-yoke</property>
                <value type="bool">false</value>
            </enter>
        </state>

        <state>
            <name>prepare-reset-yoke</name>

            <enter>
                <command>property-assign</command>
                <property>/controls/flight/aileron-cmd</property>
                <property>/controls/flight/aileron</property>
            </enter>
            <enter>
                <command>property-assign</command>
                <property>/controls/flight/elevator-cmd</property>
                <property>/controls/flight/elevator</property>
            </enter>
            <enter>
                <command>property-assign</command>
                <property>/controls/flight/freeze-yoke</property>
                <value type="bool">true</value>
            </enter>
        </state>

        <state>
            <name>reset-yoke</name>

            <enter>
                <command>property-assign</command>
                <property>/controls/flight/aileron-cmd</property>
                <value type="double">0.0</value>
            </enter>
            <enter>
                <command>property-assign</command>
                <property>/controls/flight/elevator-cmd</property>
                <value type="double">0.0</value>
            </enter>
        </state>

        <state>
            <name>locked</name>

            <enter>
                <command>property-assign</command>
                <property>/sim/model/c172p/cockpit/control-lock-visible</property>
                <value type="bool">true</value>
            </enter>
        </state>

        <!-- Transitions -->
        <transition>
            <name>init</name>
            <source>unlocked</source>
            <target>prepare-reset-yoke</target>
            <condition>
                <property>sim/model/c172p/cockpit/control-lock-placed</property>
            </condition>
        </transition>

        <transition>
            <name>prepare-center</name>
            <source>prepare-reset-yoke</source>
            <target>reset-yoke</target>
            <condition>
                <true/>
            </condition>
        </transition>

        <transition>
            <name>move-yoke-to-center</name>
            <source>reset-yoke</source>
            <target>locked</target>
            <condition>
                <and>
                    <equals>
                        <property>sim/model/c172p/cockpit/yoke-aileron</property>
                        <value>0.0</value>
                    </equals>
                    <equals>
                        <property>sim/model/c172p/cockpit/yoke-elevator</property>
                        <value>0.0</value>
                    </equals>
                </and>
            </condition>
        </transition>

        <transition>
            <name>unlock-controls</name>
            <source>locked</source>
            <source>prepare-reset-yoke</source>
            <source>reset-yoke</source>
            <target>unlocked</target>
            <condition>
                <not>
                    <property>sim/model/c172p/cockpit/control-lock-placed</property>
                </not>
            </condition>
        </transition>
    </state-machine>

</PropertyList>