Copyright (C) 1994, Digital Equipment Corp.
Digital Internal Use Only
Created on Mon Feb 14 16:01:56 PST 1994 by najork
MODULE OrthoCameraGO EXPORTS OrthoCameraGO, OrthoCameraGOProxy;
IMPORT CameraGO, CameraGOPrivate, GO, GOPrivate, GraphicsBase,
GraphicsBasePrivate, Matrix4, Point3, PointProp, PointPropPrivate, Prop,
RealProp, RealPropPrivate, TransformPropPrivate;
PROCEDURE New (from, to, up : Point3.T; height : REAL) : T =
VAR
cam := NEW (T).init ();
BEGIN
cam.setProp (CameraGO.From.bind (PointProp.NewConst (from)));
cam.setProp (CameraGO.To.bind (PointProp.NewConst (to)));
cam.setProp (CameraGO.Up.bind (PointProp.NewConst (up)));
cam.setProp (Height.bind (RealProp.NewConst (height)));
RETURN cam;
END New;
REVEAL
T = Public BRANDED OBJECT
OVERRIDES
init := Init;
draw := Draw;
damageIfDependent := DamageIfDependent;
END;
PROCEDURE Init (self : T) : T =
BEGIN
EVAL CameraGO.T.init (self);
IF MkProxyT # NIL AND self.proxy = NIL THEN
MkProxyT (self);
END;
RETURN self;
END Init;
PROCEDURE DamageIfDependent (self : T; pn : Prop.Name) =
BEGIN
IF pn = CameraGO.From OR pn = CameraGO.To OR pn = CameraGO.Up OR
pn = CameraGO.Aspect OR pn = Height OR pn = GO.Transform THEN
self.damaged := TRUE;
END;
END DamageIfDependent;
PROCEDURE Draw (self : T; state : GraphicsBase.T) =
BEGIN
IF self.damaged THEN
state.push (self);
WITH tm = GO.Transform.getState (state),
from = Matrix4.TransformPoint3 (tm, CameraGO.From.getState (state)),
to = Matrix4.TransformPoint3 (tm, CameraGO.To.getState (state)),
up = Matrix4.TransformPoint3 (tm, CameraGO.Up.getState (state)),
height = Height.getState (state),
aspect = CameraGO.Aspect.getState (state) DO
state.setLookAt (from, to, up);
state.setOrthoProj (height, aspect);
self.flag := TRUE;
END;
(* If the transformation state contains a non-uniform matrix,
the viewing parallelepiped might be distorted. In this case,
it is not possible to determine a correct value for height ... *)
state.pop (self);
END;
END Draw;
***************************************************************************
Module body
***************************************************************************
BEGIN
Height := NEW (RealProp.Name).init (10.0);
END OrthoCameraGO.