/usr/share/games/flightgear/Phi/examples/horizon.js is in flightgear-phi 2016.4.2+dfsg1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 | // Configure require.js and tell it where to find our modules
require.config({
baseUrl : '.', // use this base if we don't give absolute paths
paths : {
knockout : '/3rdparty/knockout/knockout-3.2.0',
knockprops : '/lib/knockprops',
},
});
require([
// we depend on those modules
'knockout', // lookup 'knockout' in the 'paths' attribute above,
// load the script and pass the resulting object as the
// first parameter below
'knockprops' // load 'knockprops' in the 'paths' attribute above etc.
], function(ko) {
// ko is now the locally available knockout extension
// the second arg would be knockprops but that is not needed as it registers itself with knockout.utils
// this creates the websocket to FG and registers listeners for the named properites
ko.utils.knockprops.setAliases({
pitch: "/orientation/pitch-deg",
roll: "/orientation/roll-deg"
});
// knockout stuff - create a ViewModel representing the data of the page
function ViewModel() {
var self = this;
// magic function,
// create observables for all defined properties
ko.utils.knockprops.makeObservablesForAllProperties( self );
// we now have observables as if we typed
// self.pitch = ko.observable();
// self.roll = ko.observable();
// but our knockprops observables always reflect the value of the FG property
// updated at frame rate through the websocket
// build the transform-string for the css transform property
// we want something "rotate(45deg) translate(30%)"
// see http://knockoutjs.com/documentation/computed-pure.html
self.groundTransform = ko.pureComputed(function() {
return "translateY(-50%) rotate(" + (-self.roll()) + "deg) translateY(50%)" + self.groundTranslateTransform();
});
// this little helper just scales and clamps the y-translation
self.groundTranslateTransform = ko.pureComputed(function() {
var t = 20 * (self.pitch() / 30);
if( t > 20 ) t = 20;
if( t < -20 ) t = -20;
return "translateY(" + (t) + "%)";
});
}
// Create the ViewModel instance and tell knockout to process the data-bind
// attributes of all elements within our wrapper-div.
ko.applyBindings(new ViewModel(), document.getElementById('wrapper'));
// now, every update of a registered property in flightgear gets to our browser
// through the websocket. Knockprops delivers each change to the associated ko.observable
// and fires the listeners of the observable. Those listeners trigger the change of the HTML DOM
// which results in a redraw of the browser window.
});
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