42 lines
1.2 KiB
Text
42 lines
1.2 KiB
Text
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# Projection-related helper functions for the MFD maps
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var Camera = {
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new: func(options) {
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var m = {
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parents: [Camera],
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camGeo: options['camGeo'] or geo.aircraft_position(),
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camHdg: options['camHdg'] or 0,
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range: options['range'] or 10.0,
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screenRange: options['screenRange'] or 256.0,
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screenCX: options['screenCX'] or options['screenRange'] or 256.0,
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screenCY: options['screenCY'] or options['screenRange'] or 256.0,
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};
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return m;
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},
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setRange: func(range) {
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me.range = range;
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},
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repositon: func(geo, hdg) {
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me.camGeo = geo;
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me.camHdg = hdg;
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},
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project: func(targetGeo) {
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var dist = me.camGeo.distance_to(targetGeo) * M2NM;
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var bearing = me.camGeo.course_to(targetGeo) - me.camHdg;
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return me.projectDistBearing(dist, bearing);
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},
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projectDistBearing: func(dist, bearing) {
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var bearingRad = bearing * D2R;
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var tx = math.sin(bearingRad) * dist;
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var ty = -math.cos(bearingRad) * dist;
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var x = tx * me.screenRange / me.range + me.screenCX;
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var y = ty * me.screenRange / me.range + me.screenCY;
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return [x, y];
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},
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};
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