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/*
* $RCSfile$
*
* Copyright (c) 2004 Sun Microsystems, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any
* kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
* WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
* EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
* NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
* USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
* ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
* CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
* REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
* INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed, licensed or
* intended for use in the design, construction, operation or
* maintenance of any nuclear facility.
*
* $Revision$
* $Date$
* $State$
*/
import java.lang.Math.*;
import javax.media.j3d.*;
import javax.vecmath.*;
public class Shaft extends javax.media.j3d.TransformGroup {
/**
* Construct a Shaft;
* @return a new shaft that with the specified radius centered about
* the origin an laying in the XY plane and of a specified length
* extending in the Z dimension
* @param radius radius of shaft
* @param length shaft length shaft extends from -length/2 to length/2 in
* the Z dimension
* @param segmentCount number of segments for the shaft face
* @param look the Appearance to associate with this shaft
*/
public Shaft(float radius, float length, int segmentCount,
Appearance look) {
// The direction of the ray from the shaft's center
float xDirection, yDirection;
float xShaft, yShaft;
// The z coordinates for the shaft's faces (never change)
float frontZ = -0.5f * length;
float rearZ = 0.5f * length;
int shaftFaceVertexCount; // #(vertices) per shaft face
int shaftFaceTotalVertexCount; // total #(vertices) in all teeth
int shaftFaceStripCount[] = new int[1]; // per shaft vertex count
int shaftVertexCount; // #(vertices) for shaft
int shaftStripCount[] = new int[1]; // #(vertices) in strip/strip
// Front and rear facing normals for the shaft's faces
Vector3f frontNormal = new Vector3f(0.0f, 0.0f, -1.0f);
Vector3f rearNormal = new Vector3f(0.0f, 0.0f, 1.0f);
// Outward facing normal
Vector3f outNormal = new Vector3f(1.0f, 0.0f, 0.0f);
// Temporary variables for storing coordinates and vectors
Point3f coordinate = new Point3f(0.0f, 0.0f, 0.0f);
Shape3D newShape;
// The angle subtended by a single segment
double segmentAngle = 2.0 * Math.PI/segmentCount;
double tempAngle;
// Allow this object to spin. etc.
this.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
/* for the forward facing fan:
* ___3___
* - | -
* / | \
* 4/\ | /\2
* / \ | / \
* / \ | / \
* : \ | / :
* |--------------- *----------------|
* 5 0 1
*
* for backward facing fan exchange 1 with 5; 2 with 4, etc.
*/
// Construct the shaft's front and rear face
shaftFaceVertexCount = segmentCount + 2;
shaftFaceStripCount[0] = shaftFaceVertexCount;
TriangleFanArray frontShaftFace
= new TriangleFanArray(shaftFaceVertexCount,
GeometryArray.COORDINATES
| GeometryArray.NORMALS,
shaftFaceStripCount);
TriangleFanArray rearShaftFace
= new TriangleFanArray(shaftFaceVertexCount,
GeometryArray.COORDINATES
| GeometryArray.NORMALS,
shaftFaceStripCount);
coordinate.set(0.0f, 0.0f, frontZ);
frontShaftFace.setCoordinate(0, coordinate);
frontShaftFace.setNormal(0, frontNormal);
coordinate.set(0.0f, 0.0f, rearZ);
rearShaftFace.setCoordinate(0, coordinate);
rearShaftFace.setNormal(0, rearNormal);
for(int index = 1; index < segmentCount+2; index++) {
tempAngle = segmentAngle * -(double)index;
coordinate.set(radius * (float)Math.cos(tempAngle),
radius * (float)Math.sin(tempAngle),
frontZ);
frontShaftFace.setCoordinate(index, coordinate);
frontShaftFace.setNormal(index, frontNormal);
tempAngle = -tempAngle;
coordinate.set(radius * (float)Math.cos(tempAngle),
radius * (float)Math.sin(tempAngle),
rearZ);
rearShaftFace.setCoordinate(index, coordinate);
rearShaftFace.setNormal(index, rearNormal);
}
newShape = new Shape3D(frontShaftFace, look);
this.addChild(newShape);
newShape = new Shape3D(rearShaftFace, look);
this.addChild(newShape);
// Construct shaft's outer skin (the cylinder body)
shaftVertexCount = 2 * segmentCount + 2;
shaftStripCount[0] = shaftVertexCount;
TriangleStripArray shaft
= new TriangleStripArray(shaftVertexCount,
GeometryArray.COORDINATES
| GeometryArray.NORMALS,
shaftStripCount);
outNormal.set(1.0f, 0.0f, 0.0f);
coordinate.set(radius, 0.0f, rearZ);
shaft.setCoordinate(0, coordinate);
shaft.setNormal(0, outNormal);
coordinate.set(radius, 0.0f, frontZ);
shaft.setCoordinate(1, coordinate);
shaft.setNormal(1, outNormal);
for(int count = 0; count < segmentCount; count++) {
int index = 2 + count * 2;
tempAngle = segmentAngle * (double)(count + 1);
xDirection = (float)Math.cos(tempAngle);
yDirection = (float)Math.sin(tempAngle);
xShaft = radius * xDirection;
yShaft = radius * yDirection;
outNormal.set(xDirection, yDirection, 0.0f);
coordinate.set(xShaft, yShaft, rearZ);
shaft.setCoordinate(index, coordinate);
shaft.setNormal(index, outNormal);
coordinate.set(xShaft, yShaft, frontZ);
shaft.setCoordinate(index + 1, coordinate);
shaft.setNormal(index + 1, outNormal);
}
newShape = new Shape3D(shaft, look);
this.addChild(newShape);
}
}
|
