gov.nasa.worldwind.util

Class GLUTessellatorSupport.RecursiveCallback

java.lang.Object

javax.media.opengl.glu.GLUtessellatorCallbackAdapter

gov.nasa.worldwind.util.GLUTessellatorSupport.RecursiveCallback

All Implemented Interfaces:

GLUtessellatorCallback

Enclosing class:

GLUTessellatorSupport

public static class GLUTessellatorSupport.RecursiveCallback
extends GLUtessellatorCallbackAdapter

Recursively forwards boundary tessellation results from one GLU tessellator to another. The GLU tessellator this callback forwards to may be configured in any way the caller chooses.

RecursiveCallback must be used as the GLUtessellatorCallback for the begin, end, vertex, and combine callbacks for a GLU tessellator configured to generate line loops. A GLU tessellator can be configured generate line loops by calling gluTessProperty(GLU_TESS_BOUNDARY_ONLY, GL_TRUE). Additionally, the caller specified vertex data passed to gluTessVertex must be a double array containing three elements - the x, y and z coordinates associated with the vertex.

Field Summary

Fields

Modifier and Type	Field and Description
protected GLUtessellator	tess The GLU tessellator that receives the tessellation results sent to this callback.

Constructor Summary

Constructors

Constructor and Description
RecursiveCallback(GLUtessellator tessellator) Creates a new RecursiveCallback with the GLU tessellator that receives boundary tessellation results.

Method Summary

Modifier and Type	Method and Description
void	begin(int type) Called by the GLU tessellator to indicate the beginning of a new line loop.
void	combine(double[] coords, Object[] vertexData, float[] weight, Object[] outData) Called by the GLU tessellator to indicate that up to four vertices must be merged into a new vertex.
void	end() Called by the GLU tessellator to indicate the end of the current line loop.
void	error(int errno) Called by the GLU tessellator when the tessellation algorithm encounters an error.
void	vertex(Object vertexData) Called by the GLU tessellator to indicate the next vertex of the current contour.

Methods inherited from class javax.media.opengl.glu.GLUtessellatorCallbackAdapter

beginData, combineData, edgeFlag, edgeFlagData, endData, errorData, vertexData

Methods inherited from class java.lang.Object

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

Field Detail

tess

protected GLUtessellator tess

The GLU tessellator that receives the tessellation results sent to this callback.

Constructor Detail

RecursiveCallback

public RecursiveCallback(GLUtessellator tessellator)

Creates a new RecursiveCallback with the GLU tessellator that receives boundary tessellation results.

Parameters:

tessellator - the GLU tessellator that receives the tessellation results sent to this callback. This tessellator may be configured in any way the caller chooses, but should be prepared to receive contour input from this callback.

Throws:

IllegalArgumentException - if the tessellator is null.

Method Detail

begin

public void begin(int type)

Called by the GLU tessellator to indicate the beginning of a new line loop. This recursively begins a new contour with the GLU tessellator specified during construction by calling gluTessBeginContour(tessellator).

Specified by:

begin in interface GLUtessellatorCallback

Overrides:

begin in class GLUtessellatorCallbackAdapter

Parameters:

type - the GL primitive type. Must be GL_LINE_LOOP.

combine

public void combine(double[] coords,
                    Object[] vertexData,
                    float[] weight,
                    Object[] outData)

Called by the GLU tessellator to indicate that up to four vertices must be merged into a new vertex. The new vertex is a linear combination of the original vertices. This assigns the first element of outData to coords, the coordinates of the new vertex.

Specified by:

combine in interface GLUtessellatorCallback

Overrides:

combine in class GLUtessellatorCallbackAdapter

Parameters:

coords - A three element array containing the x, y and z coordinates of the new vertex.

vertexData - The caller specified vertex data of the original vertices.

weight - The coefficients of the linear combination. These weights sum to 1.

outData - A one element array that must contain the caller specified data associated with the new vertex after this method returns.

end

public void end()

Called by the GLU tessellator to indicate the end of the current line loop. This recursively ends the current contour with the GLU tessellator specified during construction by calling gluTessEndContour(tessellator).

Specified by:

end in interface GLUtessellatorCallback

Overrides:

end in class GLUtessellatorCallbackAdapter

error

public void error(int errno)

Called by the GLU tessellator when the tessellation algorithm encounters an error. This logs a severe message describing the error.

Specified by:

error in interface GLUtessellatorCallback

Overrides:

error in class GLUtessellatorCallbackAdapter

Parameters:

errno - a GLU enumeration indicating the error.

vertex

public void vertex(Object vertexData)

Called by the GLU tessellator to indicate the next vertex of the current contour. The vertex data must be a double array containing three elements - the x, y and z coordinates associated with the vertex. This recursively indicates the next contour vertex with the GLU tessellator specified during construction by calling gluTessVertex(tessellator, (double[]) vertexData, 0, vertexData).

Specified by:

vertex in interface GLUtessellatorCallback

Overrides:

vertex in class GLUtessellatorCallbackAdapter

Parameters:

vertexData - the caller specified vertex data. Must be a double array containing three elements - the x, y and z coordinates associated with the vertex.