83 lines
3.3 KiB
Text
83 lines
3.3 KiB
Text
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The tutorial system is a Nasal script that runs tutorials defined by a set
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of properties under /sim/tutorial. The tutorials are automatically picked up by
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the GUI, and can be found under the Help menu item.
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Tutorials are typically tied to specific aircraft and defined in a
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separate XML file as follows:
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<sim>
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<tutorial include="c172-tutorial.xml"></tutorial>
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</sim>
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Each tutorial is defined by a "tutorial" leaf under /tutorial, and consists of
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the following elements.
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name - The name of the tutorial, used in the GUI
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description - A plain-text description of the tutorial, displayed in the GUI.
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audio-dir - (Optional) The directory (relative to FG_ROOT) to pick up any
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wav files used.
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timeofday - (Optional) .Time of day (morning, noon, evening...). Used to
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set the initial tutorial state.
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presets - (Optional) Properties to be set under /sim/presets, followed
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by a presets-commit command. Used to set the initial tutorial
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state. e.g. airport-id, runway, heading-deg
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init - (Optional) Initial tutorial state properties to set.
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Consists of one or more set nodes (see below for details).
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step - A tutorial step (see below for details)
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endtext - Text to display at the end of the tutorial
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endtext-voice - .wav filename to play at the end of the tutorial
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endtext-tts - Text to send to text-to-speech engine at the end of tutorial
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The bulk of the tutorial definition consists of step definitions. These are
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discreet stages within the tutorial lasting at least 5 seconds. Typically the
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consist of an instruction from the FG instructor, some exit criteria used to
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check that the user has performed the step correctly and can move to the next
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step, and a series of error conditions to check the user isn't deviating.
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Each step consists of the following elements:
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instruction - Text to display to the user when they enter the step, and
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when they have still to fulfill the exit criteria
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instruction-tts - text to send to the text-to-speech (TTS) engine
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instruction-voice - .wav filename to play
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set - (Optional) properties to set when entering the step. May
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be more than one.
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error - Error conditions, consisting of one or more check nodes
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with messages (see below)
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exit - Exit criteria, consisting of one or more check nodes
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without messages.
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Set nodes consist of
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prop - The property name to set
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val - The value to set.
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For example
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<set>
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<prop>/controls/engines/engine/throttle</prop>
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<val>0.5</val>
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</set>
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Check nodes consist of a property to check, a single operator, and (for error
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nodes) a message to display if the check evaluates to true.
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prop - The property to check
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lt - the value to check the property is less than
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gt - the value to check the property is greater than
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eq - the value to check the property is equal to.
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msg - (error node only) text message to display
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msg-tts - (error node only, optional) message to send to TTS engine
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msg-voice - (error node only, optional) .wav filename to play
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For example:
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<check>
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<prop>/controls/engines/engine/throttle</prop>
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<lt>0.95</lt>
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<msg>Apply full throttle for take-off.</msg>
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</check>
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