Package jahuwaldt.j3d.geom

Class ConeGenerator

java.lang.Object

jahuwaldt.j3d.geom.GeometryGenerator

jahuwaldt.j3d.geom.ConeGenerator

public class ConeGenerator
extends GeometryGenerator

Generator of Cone raw coordinates and geometry normals.

The generator is used to create cone shapes for the code. It only generates the geometry array. Internally the representation uses a triangle array and generates all the values requested - textures oordinates, normals and coordinates. Normals are always generated per vertex calculated rather than per-face.

The height of the cone is along the Y axis with the point in the positive Y direstion and starting at the origin. The radius is around the X-Z plane and is centered on the origin.

When generating strips, we create a strip for all the top and a strip for all the bottom (if used). Generating quads are a bit useless for this geometry type, but is supported non-the-less for completeness.

Version:

$Revision: 1.7 $

Author:

Justin Couch

Constructor Summary

Constructors

Constructor	Description
ConeGenerator()	Construct a default cone of height 2 and bottom radius of 1.
ConeGenerator(float height, float radius)	Create a custom cone of the given height and radius that includes the bottom faces.
ConeGenerator(float height, float radius, boolean hasTop, boolean hasBottom)	Create a custom cone of the given height and radius and can toggle the use of the bottom faces.
ConeGenerator(float height, float radius, int facets)	Create a custom cone of the given height and radius and can control the number of facets in the cone.
ConeGenerator(float height, float radius, int facets, boolean hasTop, boolean hasBottom)	Create a custom cone of the given height and radius and can toggle the use of the bottom faces and control the number of facets in the cone.

Method Summary

Modifier and Type	Method	Description
void	generate(GeometryData data)	Generate a new set of geometry items based on the passed data.
float[]	getDimensions()	Get the dimensions of the cone.
int	getVertexCount(GeometryData data)	Get the number of vertices that this generator will create for the shape given in the definition.
boolean	hasBottom()	Check to see that this cone has a bottom in use or not
void	setDimensions(float height, float radius, boolean hasBottom)	Change the dimensions of the cone to be generated.
void	setFacetCount(int facets)	Change the number of facets used to create this cone.

Methods inherited from class java.lang.Object

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

Constructor Detail

ConeGenerator

public ConeGenerator()

Construct a default cone of height 2 and bottom radius of 1. It also includes the bottom faces and uses 16 segments around the base of the cone.

ConeGenerator

public ConeGenerator(float height,
                     float radius)

Create a custom cone of the given height and radius that includes the bottom faces. There are 16 segments around the base of the cone.

Parameters:

height - The height of the cone to generate

radius - The radius of the bottom of the cone

ConeGenerator

public ConeGenerator(float height,
                     float radius,
                     int facets)

Create a custom cone of the given height and radius and can control the number of facets in the cone. The cone always has a base. The minimum number of facets is 3.

Parameters:

height - The height of the cone to generate

radius - The radius of the bottom of the cone

facets - The number of facets on the side of the cone

Throws:

java.lang.IllegalArgumentException - The number of facets is less than 3

ConeGenerator

public ConeGenerator(float height,
                     float radius,
                     boolean hasTop,
                     boolean hasBottom)

Create a custom cone of the given height and radius and can toggle the use of the bottom faces. There are 16 segments around the base of the cone.

Parameters:

height - The height of the cone to generate

radius - The radius of the bottom of the cone

hasTop - True if to generate faces for the top

hasBottom - True if to generate faces for the bottom

ConeGenerator

public ConeGenerator(float height,
                     float radius,
                     int facets,
                     boolean hasTop,
                     boolean hasBottom)

Create a custom cone of the given height and radius and can toggle the use of the bottom faces and control the number of facets in the cone. The minimum number of facets is 3.

Parameters:

height - The height of the cone to generate

radius - The radius of the bottom of the cone

facets - The number of facets on the side of the cone

hasTop - True if to generate faces for the top

hasBottom - True if to generate faces for the bottom

Throws:

java.lang.IllegalArgumentException - The number of facets is less than 3 or the radius is not positive

Method Detail

getDimensions

public float[] getDimensions()

Get the dimensions of the cone. These are returned as 2 values of height and radius respectively for the array. A new array is created each time so you can do what you like with it.

Returns:

The current size of the cone

hasBottom

public boolean hasBottom()

Check to see that this cone has a bottom in use or not

Returns:

true if there is a bottom in use

setDimensions

public void setDimensions(float height,
                          float radius,
                          boolean hasBottom)

Change the dimensions of the cone to be generated. Calling this will make the points be re-calculated next time you ask for geometry or normals.

Parameters:

height - The height of the cone to generate

radius - The radius of the bottom of the cone

hasBottom - True if to generate faces for the bottom

Throws:

java.lang.IllegalArgumentException - The radius is not positive

setFacetCount

public void setFacetCount(int facets)

Change the number of facets used to create this cone. This will cause the geometry to be regenerated next time they are asked for. The minimum number of facets is 3.

Parameters:

facets - The number of facets on the side of the cone

Throws:

java.lang.IllegalArgumentException - The number of facets is less than 3

getVertexCount

public int getVertexCount(GeometryData data)
                   throws UnsupportedTypeException

Get the number of vertices that this generator will create for the shape given in the definition.

Specified by:

getVertexCount in class GeometryGenerator

Parameters:

data - The data to base the calculations on

Returns:

The vertex count for the object

Throws:

UnsupportedTypeException - The generator cannot handle the type of geometry you have requested.

generate

public void generate(GeometryData data)
              throws UnsupportedTypeException,
                     InvalidArraySizeException

Generate a new set of geometry items based on the passed data. If the data does not contain the right minimum array lengths an exception will be generated. If the array reference is null, this will create arrays of the correct length and assign them to the return value.

Specified by:

generate in class GeometryGenerator

Parameters:

data - The data to base the calculations on

Throws:

InvalidArraySizeException - The array is not big enough to contain the requested geometry

UnsupportedTypeException - The generator cannot handle the type of geometry you have requested