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class Radar is subclass of GLOBAL
types
instance variables
location : Coordinates;
range : nat1;
detected : map FOId to FO;
priority : seq of FO := [];
radarDisplay: dk_au_eng_Radar;
static rc:int := 0;
operations
public Radar : int * int * nat1 ==> Radar
Radar(x,y,r) ==
(location := mk_Coordinates(x,y);
range := r;
detected := {|->};
radarDisplay := new dk_au_eng_Radar();
setupRadar(radarDisplay);
);
public Scan : AirSpace ==> ()
Scan(as) ==
(detected := { x.getId() |-> x | x in set as.getAirspace() & InRange(x) };
UpdatePriorityList();
DisplayScan();
);
private InRange : FO ==> bool
InRange(fo) ==
let foLocation = fo.getCoordinates()
in
return isPointInRange(location,range,foLocation);
public getDetected : () ==> set of FO
getDetected() ==
return rng detected;
public getDetectedMap : () ==> map FOId to FO
getDetectedMap() ==
return detected;
public saturatedRadar : () ==> bool
saturatedRadar() ==
return card dom detected > range / 4;
public getSaturatingFOs : () ==> set of FOId
getSaturatingFOs() ==
return {priority(i).getId() | i in set inds priority & i > floor(range/4)};
public getLocation : () ==> Coordinates
getLocation() ==
return location;
public getRange : () ==> nat1
getRange() ==
return range;
private UpdatePriorityList : () ==> ()
UpdatePriorityList() ==
let notDetect = elems priority \ rng detected,
newlyDet = rng detected \ elems priority
in
(
for all fobj in set notDetect do
let
id: seq of char = VDMUtil`val2seq_of_char[FOId](fobj.getId())
in
radarDisplay.RemFlyingObject(id);
for all fobj in set newlyDet do
let
mk_Coordinates(X,Y) = fobj.getCoordinates(),
token2seq_of_char = VDMUtil`val2seq_of_char[token]
in
radarDisplay.AddFlyingObject(X,Y,0,token2seq_of_char(fobj.getId()));
removeNotDetected(notDetect);
addNewlyDetected(newlyDet);
);
private removeNotDetected : set of FO ==> ()
removeNotDetected(fos) ==
priority := [priority(i) | i in set inds priority
& priority(i) in set fos];
private addNewlyDetected : set of FO ==> ()
addNewlyDetected(newlyDetect) ==
priority := priority ^ set2seqFO(newlyDetect);
private setupRadar: dk_au_eng_Radar ==> ()
setupRadar(r) == (r.SetWindowPosition(450*rc+50,100);
r.SetStepSize(5);
r.SetScanTime(60);
r.SetScanWidth(350);
let
int2seq_of_char = VDMUtil`val2seq_of_char[int],
mk_Coordinates(x,y) = location
in
r.SetTitle("MSAW Radar: (" ^ int2seq_of_char(x) ^ "," ^ int2seq_of_char(y) ^ ")");
rc:=rc+1;);
private DisplayScan: () ==> ()
DisplayScan() == for all x in set {1,...,360/5} do radarDisplay.StepRadar();
functions
set2seqFO : set of FO -> seq of FO
set2seqFO(fos) ==
if fos = {}
then []
else
let fo in set fos
in
[fo] ^ set2seqFO(fos\{fo})
measure set2seqFOm;
set2seqFOm : set of FO -> nat
set2seqFOm(fos) == card fos;
end Radar
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