maspack.render

Class FeatureIndexArray

java.lang.Object

maspack.render.FeatureIndexArray

public class FeatureIndexArray
extends java.lang.Object

Container for keep tracking of feature indices, vertices, and offsets

Author:

Antonio

Constructor Summary

Constructors

Constructor and Description
FeatureIndexArray()
FeatureIndexArray(int featureCap, int vertexCap)

Method Summary

Modifier and Type	Method and Description
void	addVertex(int vidx) Adds a vertex index to the current feature (see beginFeature(int)
void	beginFeature(int number) Starts building a feature with the provided feature number (such as face index or line index)
void	chop(int fidx, int nfeatures) Performs an in-place slice(int, int), modifying this feature array.
void	endFeature() Ends building a feature
int	getFeature(int idx) Returns the feature number at the provided index
int	getFeatureLength(int idx) The number of vertex indices that define a given feature
int	getFeatureOffset(int idx) Returns the offset into the vertex index array for the start of the ith feature
DynamicIntArray	getVertexOffsets() Vertices associated with each feature are concatenated into a single array (see getVertices()).
VertexIndexArray	getVertices() Concatenated list of vertex indices for all contained features.
int	numFeatures()
FeatureIndexArray	slice(int fidx, int nfeatures) Returns a subset of features

Methods inherited from class java.lang.Object

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

Constructor Detail

FeatureIndexArray

public FeatureIndexArray()

FeatureIndexArray

public FeatureIndexArray(int featureCap,
                         int vertexCap)

Method Detail

beginFeature

public void beginFeature(int number)

Starts building a feature with the provided feature number (such as face index or line index)

Parameters:

number - tracked feature number

addVertex

public void addVertex(int vidx)

Adds a vertex index to the current feature (see beginFeature(int)

Parameters:

vidx - vertex index

endFeature

public void endFeature()

Ends building a feature

See Also:

beginFeature(int)

numFeatures

public int numFeatures()

Returns:

number of features

slice

public FeatureIndexArray slice(int fidx,
                               int nfeatures)

Returns a subset of features

Parameters:

fidx - starting feature index

nfeatures - number of features

chop

public void chop(int fidx,
                 int nfeatures)

Performs an in-place slice(int, int), modifying this feature array.

Parameters:

fidx - starting feature index

nfeatures - number of features

getFeatureOffset

public int getFeatureOffset(int idx)

Returns the offset into the vertex index array for the start of the ith feature

Parameters:

idx - index of feature

Returns:

offset

getFeature

public int getFeature(int idx)

Returns the feature number at the provided index

Parameters:

idx - index of feature

Returns:

feature number

getFeatureLength

public int getFeatureLength(int idx)

The number of vertex indices that define a given feature

Parameters:

idx - feature index

Returns:

number of vertices

getVertexOffsets

public DynamicIntArray getVertexOffsets()

Vertices associated with each feature are concatenated into a single array (see getVertices()). This provides the offsets into that array. The number of vertices can be obtained by taking the difference offset.get(i+1)-offset.get(i). The last element in the offset array is the total number of vertices.

Returns:

offsets in the vertex array for each feature

getVertices

public VertexIndexArray getVertices()

Concatenated list of vertex indices for all contained features.

Returns:

index array of vertices