Copyright (C) 1994, Digital Equipment Corp.
Created on Tue Jan 19 14:00:00 PST 1994 by najork
MODULE ObPoint3;
IMPORT ObAux, ObCommand, ObLib, ObReal, ObValue, Obliq, Point3, SynLocation;
CONST
pkgname = "Point3";
***************************************************************************
Wrapper for Point3.T
***************************************************************************
REVEAL
T = ObValue.ValArray;
PROCEDURE M3ToObliq (val : Point3.T) : T =
BEGIN
WITH x = ObReal.M3ToObliq (val.x),
y = ObReal.M3ToObliq (val.y),
z = ObReal.M3ToObliq (val.z) DO
RETURN Obliq.NewArray (Obliq.Vals {x, y, z});
END;
END M3ToObliq;
PROCEDURE ObliqToM3 (val : T) : Point3.T RAISES {ObValue.Error} =
VAR
vals : ARRAY [0 .. 2] OF Obliq.Val;
BEGIN
Obliq.ToArray (val, vals);
WITH x = ObReal.ObliqToM3 (vals[0]),
y = ObReal.ObliqToM3 (vals[1]),
z = ObReal.ObliqToM3 (vals[2]) DO
RETURN Point3.T {x, y, z};
END;
END ObliqToM3;
PROCEDURE GetArg (args : ObValue.ArgArray;
idx : INTEGER;
package : ObLib.T;
opCode : ObLib.OpCode;
loc : SynLocation.T) : Point3.T RAISES {ObValue.Error} =
VAR
vals : ARRAY [0 .. 2] OF Obliq.Val;
BEGIN
TRY
Obliq.ToArray (args[idx], vals);
WITH x = ObReal.ObliqToM3 (vals[0]),
y = ObReal.ObliqToM3 (vals[1]),
z = ObReal.ObliqToM3 (vals[2]) DO
RETURN Point3.T {x, y, z};
END;
EXCEPT
| ObValue.Error =>
ObValue.BadArgType (idx, pkgname, package.name, opCode.name, loc);
RETURN Point3.Origin; (* ... only to suppress compiler warning *)
END;
END GetArg;
***************************************************************************
Setup procedures
***************************************************************************
PROCEDURE SetupPackage () =
PROCEDURE NewOpCode (name: TEXT; arity: INTEGER; code: Code) : OpCode =
BEGIN
RETURN NEW (OpCode, name := name, arity := arity, code := code);
END NewOpCode;
TYPE
OpCodes = ARRAY OF ObLib.OpCode;
VAR
opCodes: REF OpCodes;
BEGIN
opCodes := NEW (REF OpCodes, NUMBER (Code));
opCodes^ :=
OpCodes {
NewOpCode ("Plus", 2, Code.Plus),
NewOpCode ("Minus", 2, Code.Minus),
NewOpCode ("ScaleToLen", 2, Code.ScaleToLen),
NewOpCode ("TimesScalar", 2, Code.TimesScalar),
NewOpCode ("Length", 1, Code.Length),
NewOpCode ("MidPoint", 2, Code.MidPoint),
NewOpCode ("Distance", 2, Code.Distance)
};
ObLib.Register (NEW (Package, name := pkgname, opCodes := opCodes));
ObLib.RegisterHelp (pkgname, Help);
END SetupPackage;
***************************************************************************
Setup procedures
***************************************************************************
TYPE
Code = {Plus, Minus, ScaleToLen, TimesScalar,
Length, MidPoint, Distance};
OpCode = ObLib.OpCode OBJECT
code: Code;
END;
Package = ObLib.T OBJECT
OVERRIDES
Eval := DoEval;
END;
PROCEDURE DoEval (self : Package;
opCode : ObLib.OpCode;
<* UNUSED *> arity : ObLib.OpArity;
READONLY args: ObValue.ArgArray;
<* UNUSED *> temp : BOOLEAN;
loc : SynLocation.T) : ObValue.Val
RAISES {ObValue.Error} =
BEGIN
CASE NARROW (opCode, OpCode).code OF
| Code.Plus =>
WITH p1 = GetArg (args, 1, self, opCode, loc),
p2 = GetArg (args, 2, self, opCode, loc) DO
RETURN M3ToObliq (Point3.Plus (p1, p2));
END;
| Code.Minus =>
WITH p1 = GetArg (args, 1, self, opCode, loc),
p2 = GetArg (args, 2, self, opCode, loc) DO
RETURN M3ToObliq (Point3.Minus (p1, p2));
END;
| Code.ScaleToLen =>
WITH p = GetArg (args, 1, self, opCode, loc),
s = ObReal.GetArg (args, 2, self, opCode, loc) DO
RETURN M3ToObliq (Point3.ScaleToLen (p, s));
END;
| Code.TimesScalar =>
WITH p = GetArg (args, 1, self, opCode, loc),
s = ObReal.GetArg (args, 2, self, opCode, loc) DO
RETURN M3ToObliq (Point3.TimesScalar (p, s));
END;
| Code.Length =>
WITH p = GetArg (args, 1, self, opCode, loc) DO
RETURN ObReal.M3ToObliq (Point3.Length (p));
END;
| Code.MidPoint =>
WITH a = GetArg (args, 1, self, opCode, loc),
b = GetArg (args, 2, self, opCode, loc) DO
RETURN M3ToObliq (Point3.MidPoint (a, b));
END;
| Code.Distance =>
WITH a = GetArg (args, 1, self, opCode, loc),
b = GetArg (args, 2, self, opCode, loc) DO
RETURN ObReal.M3ToObliq (Point3.Distance (a, b));
END;
END;
END DoEval;
***************************************************************************
Help
***************************************************************************
PROCEDURE Help (self : ObCommand.T; arg : TEXT; <* UNUSED *> data : REFANY) =
BEGIN
ObAux.Help (self, arg, pkgname);
END Help;
BEGIN
END ObPoint3.