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Howto:Start core development: Difference between revisions
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Finally you will want to familiarize yourself with the data that is exposed in the property tree. This is an excellent learning tool. When running | Finally you will want to familiarize yourself with the data that is exposed in the property tree. This is an excellent learning tool. When running | ||
FlightGear, bring up the Property browser from the | FlightGear, bring up the Property browser from the Debug menu. This property tree is essential for much of the way in which configuration and data output | ||
are handled in FlightGear. For example the flight instruments are all configured using | are handled in FlightGear. For example the flight instruments are all configured using XML defined references to values in the property tree in | ||
order to position needles, etc. Changing property values can be used to alter the configured behavior of FlightGear at startup using parameters and/or | order to position needles, etc. Changing property values can be used to alter the configured behavior of FlightGear at startup using parameters and/or XML declarations, or on the fly using C++ property class functions in the code or from several other interfaces including the property browser (for example: try adjusting the cloud layer settings in the property browser under environment/clouds, you will see the effect right away). | ||
Speaking of instruments, you might want to take a look at how some of the instrumentation configuration (Aircraft/Instrumentation/*.xml files in the | Speaking of instruments, you might want to take a look at how some of the instrumentation configuration (Aircraft/Instrumentation/*.xml files in the | ||
base package) in order to get an idea of how different parts of | base package) in order to get an idea of how different parts of FlightGear can be configured to communicate with other parts in a certain way through the | ||
property tree. You can also look at the preferences.xml file to see an example of how startup configuration for various subsystems is handled through | property tree. You can also look at the preferences.xml file to see an example of how startup configuration for various subsystems is handled through | ||
the property tree. | the property tree. | ||