Ziele Untersuchung
mit Columbo Integrität von
Datenbanken Interaktion und
Portierbarkeit Ergonomie der
Schnittstellen

Angebot Produkte Projekt Beratung

Mittel Analytik Modellierung Sprachen Algebra Logik Hardware Denken Kreativität

Zusammenhänge Gesellschaft Wirtschaft Branche Firma


products/sources/formale Sprachen/C/Lyx/src/ (Beweissystem der NASA Version 6.0.9^©) Datei vom 26.9.1998 mit Größe 734 B

Quelle GLOBAL.vdmpp Sprache: unbekannt

class GLOBAL

types

public Altitude = real;

public FOId = token;
public RadarId = token;

public
Coordinates ::
  X : real
  Y : real;

public Time = nat;

public String = seq of char;

public ObstacleType = <Natural> | <Artificial> | <Airport>  | <Military_Area>;

public FOWarning = ObstacleType | <EstimationWarning>;

public RadarWarning = <Saturated>;

public MinimumSafetyAltitude = nat | <NotAllowed>;

public Position ::
  coord    : Coordinates
  altitude : Altitude;

public History = seq of Position;

public Vector ::
  X : real
  Y : real;

functions

protected isPointInRange : Coordinates * nat1 * Coordinates -> bool
isPointInRange(center,range,point) ==
  (center.X - point.X)**2 + (center.Y - point.Y)**2 <= range**2;

protected vectorSum : Vector * Vector -> Vector
vectorSum(v1,v2) ==
  mk_Vector(v1.X + v2.X,v1.Y + v2.Y);

protected vectorDiv : Vector * int -> Vector
vectorDiv(v,n) ==
  mk_Vector(v.X/n,v.Y/n)
pre n <> 0;

protected addVectorToPoint : Vector * Position -> Coordinates
addVectorToPoint(v,p) ==
  mk_Coordinates(p.coord.X + v.X, p.coord.Y + v.Y);

protected vectorLength : Vector -> real
vectorLength(v) ==
  MATH`sqrt(v.X**2 + v.Y**2);

protected unitVector : Vector -> Vector
unitVector(v) ==
  let l = vectorLength(v)
  in
    mk_Vector(v.X/l,v.Y/l);

protected dotProduct : Vector * Vector -> real
dotProduct(v1,v2) ==
  v1.X * v2.X + v1.Y * v2.Y;

protected angleBetweenVectors : Vector * Vector -> real
angleBetweenVectors(v1,v2) ==
  let uv1 = unitVector(v1),
      uv2 = unitVector(v2),
      dvs = dotProduct(uv1,uv2),
      angle = MATH`acos(dvs)
  in
    radians2degree(angle);

protected radians2degree : real -> real
radians2degree(r) ==
  r * (180/MATH`pi);

protected atan2 : real * real -> real
atan2(y,x) ==
  2 * MATH`atan(y/(MATH`sqrt(x**2+y**2)+x))
pre not (x = 0 and y = 0);

protected signedVectorAngle : Vector * Vector -> real
signedVectorAngle(v1,v2) ==
  atan2(v2.Y,v2.X) - atan2(v1.Y,v1.X);

protected vectorAngle : Vector -> real * real
vectorAngle(v) ==
   mk_( radians2degree (MATH`acos(v.X / MATH`sqrt(v.X**2 + v.Y**2))),
        radians2degree( MATH`asin(v.Y / MATH`sqrt(v.X**2 + v.Y**2))));

protected vectorRotate : Vector * real -> Vector
vectorRotate(v,a) ==
  let x' = MATH`cos(a)*v.X - MATH`sin(a)*v.Y,
      y' = MATH`cos(a)*v.Y + MATH`sin(a)*v.X
  in
    mk_Vector(round(x'),round(y'));

protected round : real -> real
round(r) ==
  let fr  = floor(r),
      dif = abs(r - fr)
  in
    if(dif < 10**-10)
    then fr
    else r;

operations

public test : real * real * real * real ==> Vector * Vector * real * real * Vector * real * real
test(x1,y1,x2,y2) ==
  let v1 = mk_Vector(x1,y1),
      v2 = mk_Vector(x2,y2)
  in
    return mk_(unitVector(v1),
               unitVector(v2),
               dotProduct(unitVector(v1),unitVector(v2)),
               atan2(0.000001,0.0000000),
               vectorRotate(v2,signedVectorAngle(v1,v2)),
               radians2degree(signedVectorAngle(v1,v2)),
               angleBetweenVectors(v1,v2)
              );

end GLOBAL

quality95%