Examples of javax.media.j3d.Transform3D

javax.media.j3d.Transform3D
A generalized transform object represented internally as a 4x4 double-precision floating point matrix. The mathematical representation is row major, as in traditional matrix mathematics. A Transform3D is used to perform translations, rotations, and scaling and shear effects.
A transform has an associated type, and all type classification is left to the Transform3D object. A transform will typically have multiple types, unless it is a general, unclassifiable matrix, in which case it won't be assigned a type.
The Transform3D type is internally computed when the transform object is constructed and updated any time it is modified. A matrix will typically have multiple types. For example, the type associated with an identity matrix is the result of ORing all of the types, except for ZERO and NEGATIVE_DETERMINANT, together. There are public methods available to get the ORed type of the transformation, the sign of the determinant, and the least general matrix type. The matrix type flags are defined as follows:
- ZERO - zero matrix. All of the elements in the matrix have the value 0.
- IDENTITY - identity matrix. A matrix with ones on its main diagonal and zeros every where else.
- SCALE - the matrix is a uniform scale matrix - there are no rotational or translation components.
- ORTHOGONAL - the four row vectors that make up an orthogonal matrix form a basis, meaning that they are mutually orthogonal. The scale is unity and there are no translation components.
- RIGID - the upper 3 X 3 of the matrix is orthogonal, and there is a translation component-the scale is unity.
- CONGRUENT - this is an angle- and length-preserving matrix, meaning that it can translate, rotate, and reflect about an axis, and scale by an amount that is uniform in all directions. These operations preserve the distance between any two points, and the angle between any two intersecting lines.
- AFFINE - an affine matrix can translate, rotate, reflect, scale anisotropically, and shear. Lines remain straight, and parallel lines remain parallel, but the angle between intersecting lines can change.
A matrix is also classified by the sign of its determinant:
The Java 3D model for 4 X 4 transformations is:
Note: When transforming a Point3f or a Point3d, the input w is set to 1. When transforming a Vector3f or Vector3d, the input w is set to 0.

        }


        MultiTransformGroup mtg = universe.getViewingPlatform().getMultiTransformGroup();


        mtg.getTransformGroup(0).setTransform(
            new Transform3D(rotfix, new Vector3d(BoardModel.getHexLocation(c, hex.getElevation())), 1.0)
        );
    }

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    @Override
    void reset() {
        MultiTransformGroup mtg = universe.getViewingPlatform().getMultiTransformGroup();


        TransformGroup rotateTrans = mtg.getTransformGroup(1);
        Transform3D rtrans = new Transform3D();
        rtrans.rotX(-Math.PI/2);
        rotateTrans.setTransform(rtrans);


        TransformGroup tiltTrans = mtg.getTransformGroup(3);
        Transform3D ttrans = new Transform3D();
        ttrans.rotX(Math.PI/3);
        tiltTrans.setTransform(ttrans);


        TransformGroup zoomTrans = mtg.getTransformGroup(4);
        Transform3D ztrans = new Transform3D();
        ztrans.setTranslation(new Vector3d(0.0, 0.0, 20*BoardModel.HEX_DIAMETER));
        zoomTrans.setTransform(ztrans);
    }

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        View view = universe.getViewer().getView();
        view.setProjectionPolicy(View.PERSPECTIVE_PROJECTION);
        view.setScreenScalePolicy(View.SCALE_SCREEN_SIZE);


        TransformGroup rotateTrans = mtg.getTransformGroup(1);
        Transform3D rtrans = new Transform3D();
        rtrans.rotX(-Math.PI/2);
        rotateTrans.setTransform(rtrans);


        TransformGroup panTrans = mtg.getTransformGroup(2);
        Transform3D ptrans = new Transform3D();
        panTrans.setTransform(ptrans);


        TransformGroup tiltTrans = mtg.getTransformGroup(3);
        Transform3D ttrans = new Transform3D();
        ttrans.rotX(Math.PI/3);
        tiltTrans.setTransform(ttrans);


        TransformGroup zoomTrans = mtg.getTransformGroup(4);
        zoomTrans.setTransform(new Transform3D(new Quat4d(), new Vector3d(0.0, 0.0, 20*BoardModel.HEX_DIAMETER), 1.0));


        Transform3D etrans = new Transform3D();
        etrans.lookAt(new Point3d(0, 0, 0), new Point3d(0, 0, -1), new Vector3d(0, 1, 0));
        etrans.invert();
        mtg.getTransformGroup(5).setTransform(etrans);


        MouseWheelZoom behavior0 = new MouseWheelZoom(zoomTrans);
        behavior0.setFactor(-BoardModel.HEX_DIAMETER/3);
        controllers.addChild(behavior0);

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    @Override
    void zoom(int steps) {
        MultiTransformGroup mtg = universe.getViewingPlatform().getMultiTransformGroup();
        TransformGroup zoomTrans = mtg.getTransformGroup(4);


        Transform3D trans = new Transform3D();
        zoomTrans.getTransform(trans);


        Vector3d t = new Vector3d();
        trans.get(t);
        t.z -= steps*4*BoardModel.HEX_DIAMETER;
        trans.setTranslation(t);


        zoomTrans.setTransform(trans);
    }

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    @Override
    Node makeViewRelative(Node obj, double centerDistance) {
        MultiTransformGroup mtg = universe.getViewingPlatform().getMultiTransformGroup();


        Transform3D rtrans = new Transform3D();
        mtg.getTransformGroup(1).getTransform(rtrans);
        Transform3D ttrans = new Transform3D();
        mtg.getTransformGroup(3).getTransform(ttrans);
        Transform3D ptrans = new Transform3D();
        Transform3D ftrans = new Transform3D();
        ftrans.rotX(Math.PI/2);
        ptrans.setTranslation(new Vector3d(0.0, -centerDistance, 1.0));


        TransformGroup t = new TransformGroup(ttrans);
        t.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
        TransformGroup p = new TransformGroup(ptrans);

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        if (type != TRANSLATE) {
            return;
        }


        MultiTransformGroup mtg = universe.getViewingPlatform().getMultiTransformGroup();
        Transform3D old = new Transform3D();
        mtg.getTransformGroup(0).getTransform(old);
        Transform3D rot = new Transform3D();
        mtg.getTransformGroup(1).getTransform(rot);
        Vector3d transv = new Vector3d();
        trans.get(transv);
        Point3d transp = new Point3d(transv);
        rot.transform(transp);
        old.transform(transp);
        old.setTranslation(new Vector3d(transp));
        mtg.getTransformGroup(0).setTransform(old);
        mtg.getTransformGroup(2).setTransform(new Transform3D());
    }

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            Entity e = game.getEntities(c).nextElement();
            level += e.getElevation();
        } catch (Exception e) {
        }


        Transform3D v2i = new Transform3D();
        getVworldToImagePlate(v2i);
        Point3d p = BoardModel.getHexLocation(c, level);
        v2i.transform(p);
        Point2d pixel = new Point2d();
        getPixelLocationFromImagePlate(p, pixel);
        ((PopupMenu)popup).show(this, (int) pixel.x, (int) pixel.y);
    }

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        }


        MultiTransformGroup mtg = universe.getViewingPlatform().getMultiTransformGroup();


        mtg.getTransformGroup(0).setTransform(
            new Transform3D(C.nullRot, new Vector3d(BoardModel.getHexLocation(c, hex.getElevation())), 1.0)
        );


        center();
    }

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    void center() {
        // TODO: smooth reset
        MultiTransformGroup mtg = universe.getViewingPlatform().getMultiTransformGroup();


        TransformGroup panTrans = mtg.getTransformGroup(1);
        Transform3D ptrans = new Transform3D();
        ptrans.rotX(Math.PI/2);
        panTrans.setTransform(ptrans);
    }

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        view.setScreenScale(scale);


        // seems like this is needed to counter too much J3D optimization
        TransformGroup panTrans = universe.getViewingPlatform().getMultiTransformGroup().getTransformGroup(1);
        Transform3D ptrans = new Transform3D();
        panTrans.getTransform(ptrans);
        panTrans.setTransform(ptrans);
    }

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