com.sun.j3d.utils.geometry
Class Cylinder

java.lang.Object
  |
  +--javax.media.j3d.SceneGraphObject
        |
        +--javax.media.j3d.Node
              |
              +--javax.media.j3d.Group
                    |
                    +--com.sun.j3d.utils.geometry.Primitive
                          |
                          +--com.sun.j3d.utils.geometry.Cylinder

public class Cylinder

extends Primitive

Cylinder is a geometry primitive defined with a radius and a height. It is a capped cylinder centered at the origin with its central axis aligned along the Y-axis.

When a texture is applied to a cylinder, the texture is applied to the caps and the body different. A texture is mapped CCW from the back of the body. The top and bottom caps are mapped such that the texture appears front facing when the caps are rotated 90 degrees toward the viewer.

By default all primitives with the same parameters share their geometry (e.g., you can have 50 shperes in your scene, but the geometry is stored only once). A change to one primitive will effect all shared nodes. Another implication of this implementation is that the capabilities of the geometry are shared, and once one of the shared nodes is live, the capabilities cannot be set. Use the GEOMETRY_NOT_SHARED flag if you do not wish to share geometry among primitives with the same parameters.

Field Summary

static int	BODY Designates the body of the cylinder.
static int	BOTTOM Designates the bottom end-cap of the cylinder.
static int	TOP Designates the top end-cap of the cylinder.

Fields inherited from class com.sun.j3d.utils.geometry.Primitive

ENABLE_APPEARANCE_MODIFY, ENABLE_GEOMETRY_PICKING, GENERATE_NORMALS, GENERATE_NORMALS_INWARD, GENERATE_TEXTURE_COORDS, GEOMETRY_NOT_SHARED

Fields inherited from class javax.media.j3d.Group

ALLOW_CHILDREN_EXTEND, ALLOW_CHILDREN_READ, ALLOW_CHILDREN_WRITE, ALLOW_COLLISION_BOUNDS_READ, ALLOW_COLLISION_BOUNDS_WRITE

Fields inherited from class javax.media.j3d.Node

ALLOW_AUTO_COMPUTE_BOUNDS_READ, ALLOW_AUTO_COMPUTE_BOUNDS_WRITE, ALLOW_BOUNDS_READ, ALLOW_BOUNDS_WRITE, ALLOW_COLLIDABLE_READ, ALLOW_COLLIDABLE_WRITE, ALLOW_LOCAL_TO_VWORLD_READ, ALLOW_PICKABLE_READ, ALLOW_PICKABLE_WRITE, ENABLE_COLLISION_REPORTING, ENABLE_PICK_REPORTING

Constructor Summary

Cylinder()
Constructs a default cylinder of radius of 1.0 and height of 2.0.

Cylinder(float radius, float height)
Constructs a default cylinder of a given radius and height.

Cylinder(float radius, float height, Appearance ap)
Constructs a default cylinder of a given radius, height, and appearance.

Cylinder(float radius, float height, int primflags, Appearance ap)
Constructs a default cylinder of a given radius, height, primitive flags and appearance.

Cylinder(float radius, float height, int primflags, int xdivision, int ydivision, Appearance ap)
Constructs a customized cylinder of a given radius, height, resolution (X and Y dimensions), and appearance.

Method Summary

Node	cloneNode(boolean forceDuplicate) Used to create a new instance of the node.
void	duplicateNode(Node originalNode, boolean forceDuplicate) Copies all node information from originalNode into the current node.
Appearance	getAppearance(int partId) Gets the appearance of the specified part of the cylinder.
float	getHeight() Returns the height of the cylinder
float	getRadius() Returns the radius of the cylinder
Shape3D	getShape(int partId) Obtains the Shape3D node associated with a given part of the cylinder.
int	getXdivisions() Returns the number divisions along the X direction
int	getYdivisions() Returns the number of divisions along the height of the cylinder
void	setAppearance(Appearance ap) Sets appearance of the cylinder.

Methods inherited from class com.sun.j3d.utils.geometry.Primitive

cacheGeometry, getAppearance, getCachedGeometry, getNumTriangles, getNumVertices, getPrimitiveFlags, setAppearance, setAppearance, setNumTriangles, setNumVertices, setPrimitiveFlags

Methods inherited from class javax.media.j3d.Group

addChild, getAllChildren, getAlternateCollisionTarget, getChild, getCollisionBounds, indexOfChild, insertChild, moveTo, numChildren, removeAllChildren, removeChild, removeChild, setAlternateCollisionTarget, setChild, setCollisionBounds

Methods inherited from class javax.media.j3d.Node

cloneTree, cloneTree, cloneTree, cloneTree, cloneTree, cloneTree, getBounds, getBoundsAutoCompute, getCollidable, getLocalToVworld, getLocalToVworld, getParent, getPickable, setBounds, setBoundsAutoCompute, setCollidable, setPickable

Methods inherited from class javax.media.j3d.SceneGraphObject

clearCapability, clearCapabilityIsFrequent, duplicateSceneGraphObject, getCapability, getCapabilityIsFrequent, getUserData, isCompiled, isLive, setCapability, setCapabilityIsFrequent, setUserData, updateNodeReferences

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

BODY

public static final int BODY

Designates the body of the cylinder. Used by getShape.

See Also:

getShape(int), Constant Field Values

TOP

public static final int TOP

Designates the top end-cap of the cylinder. Used by getShape.

See Also:

getShape(int), Constant Field Values

BOTTOM

public static final int BOTTOM

Designates the bottom end-cap of the cylinder. Used by getShape.

See Also:

getShape(int), Constant Field Values

Constructor Detail

Cylinder

public Cylinder()

Constructs a default cylinder of radius of 1.0 and height of 2.0. Normals are generated by default, texture coordinates are not. Resolution defaults to 15 divisions along X axis and 1 along the Y axis.

Cylinder

public Cylinder(float radius,
                float height)

Constructs a default cylinder of a given radius and height. Normals are generated by default, texture coordinates are not.

Parameters:

radius - Radius

height - Height

Cylinder

public Cylinder(float radius,
                float height,
                Appearance ap)

Constructs a default cylinder of a given radius, height, and appearance. Normals are generated by default, texture coordinates are not.

Parameters:

radius - Radius

height - Height

ap - Appearance

Cylinder

public Cylinder(float radius,
                float height,
                int primflags,
                Appearance ap)

Constructs a default cylinder of a given radius, height, primitive flags and appearance.

Parameters:

radius - Radius

height - Height

primflags - Flags

ap - Appearance

Cylinder

public Cylinder(float radius,
                float height,
                int primflags,
                int xdivision,
                int ydivision,
                Appearance ap)

Constructs a customized cylinder of a given radius, height, resolution (X and Y dimensions), and appearance. The resolution is defined in terms of number of subdivisions along the object's X axis (width) and Y axis (height). More divisions lead to more finely tesselated objects.

Parameters:

radius - Radius

height - Height

xdivision - Number of divisions along X direction.

ydivision - Number of divisions along height of cylinder.

primflags - Primitive flags.

ap - Appearance

Method Detail

getShape

public Shape3D getShape(int partId)

Obtains the Shape3D node associated with a given part of the cylinder. This allows users to modify the appearance or geometry of individual parts.

Specified by:

getShape in class Primitive

Parameters:

partId - The part to return (BODY, TOP, or BOTTOM).

Returns:

The Shape3D object associated with the partID. If an invalid partId is passed in, null is returned.

setAppearance

public void setAppearance(Appearance ap)

Sets appearance of the cylinder. This will set each part of the cylinder (TOP,BOTTOM,BODY) to the same appearance. To set each part's appearance separately, use getShape(partId) to get the individual shape and call shape.setAppearance(ap).

Specified by:

setAppearance in class Primitive

getAppearance

public Appearance getAppearance(int partId)

Gets the appearance of the specified part of the cylinder.

Specified by:

getAppearance in class Primitive

Returns:

The appearance object associated with the partID. If an invalid partId is passed in, null is returned.

Since:

Java 3D 1.2.1

cloneNode

public Node cloneNode(boolean forceDuplicate)

Used to create a new instance of the node. This routine is called by cloneTree to duplicate the current node. cloneNode should be overridden by any user subclassed objects. All subclasses must have their cloneNode method consist of the following lines:

     public Node cloneNode(boolean forceDuplicate) {
         UserSubClass usc = new UserSubClass();
         usc.duplicateNode(this, forceDuplicate);
         return usc;
     }
 

Overrides:

cloneNode in class Group

Parameters:

forceDuplicate - when set to true, causes the duplicateOnCloneTree flag to be ignored. When false, the value of each node's duplicateOnCloneTree variable determines whether NodeComponent data is duplicated or copied.

See Also:

Node.cloneTree(), Node.duplicateNode(javax.media.j3d.Node, boolean), NodeComponent.setDuplicateOnCloneTree(boolean)

duplicateNode

public void duplicateNode(Node originalNode,
                          boolean forceDuplicate)

Copies all node information from originalNode into the current node. This method is called from the cloneNode method which is, in turn, called by the cloneTree method.

For any NodeComponent objects contained by the object being duplicated, each NodeComponent object's duplicateOnCloneTree value is used to determine whether the NodeComponent should be duplicated in the new node or if just a reference to the current node should be placed in the new node. This flag can be overridden by setting the forceDuplicate parameter in the cloneTree method to true.

Overrides:

duplicateNode in class Node

Parameters:

originalNode - the original node to duplicate.

forceDuplicate - when set to true, causes the duplicateOnCloneTree flag to be ignored. When false, the value of each node's duplicateOnCloneTree variable determines whether NodeComponent data is duplicated or copied.

See Also:

Node.cloneTree(), Node.cloneNode(boolean), NodeComponent.setDuplicateOnCloneTree(boolean)

getRadius

public float getRadius()

Returns the radius of the cylinder

Since:

Java 3D 1.2.1

getHeight

public float getHeight()

Returns the height of the cylinder

Since:

Java 3D 1.2.1

getXdivisions

public int getXdivisions()

Returns the number divisions along the X direction

Since:

Java 3D 1.2.1

getYdivisions

public int getYdivisions()

Returns the number of divisions along the height of the cylinder

Since:

Java 3D 1.2.1