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-/*
- * $RCSfile$
- *
- * Copyright (c) 2006 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 Gear extends javax.media.j3d.TransformGroup {
-
- // Specifiers determining whether to generate outward facing normals or
- // inward facing normals.
- static final int OutwardNormals = 1;
- static final int InwardNormals = -1;
-
- // The number of teeth in the gear
- int toothCount;
-
- // Gear start differential angle. All gears are constructed with the
- // center of a tooth at Z-axis angle = 0.
- double gearStartAngle;
- // The Z-rotation angle to place the tooth center at theta = 0
- float toothTopCenterAngle;
- // The Z-rotation angle to place the valley center at theta = 0
- float valleyCenterAngle;
- // The angle about Z subtended by one tooth and its associated valley
- float circularPitchAngle;
-
- // Increment angles
- float toothValleyAngleIncrement;
-
- // Front and rear facing normals for the gear's body
- final Vector3f frontNormal = new Vector3f(0.0f, 0.0f, -1.0f);
- final Vector3f rearNormal = new Vector3f(0.0f, 0.0f, 1.0f);
-
-
- Gear(int toothCount) {
- this.toothCount = toothCount;
- }
-
- void addBodyDisks(float shaftRadius, float bodyOuterRadius,
- float thickness, Appearance look) {
- int gearBodySegmentVertexCount; // #(segments) per tooth-unit
- int gearBodyTotalVertexCount; // #(vertices) in a gear face
- int gearBodyStripCount[] = new int[1]; // per strip (1) vertex count
-
- // A ray from the gear center, used in normal calculations
- float xDirection, yDirection;
-
- // The x and y coordinates at each point of a facet and at each
- // point on the gear: at the shaft, the root of the teeth, and
- // the outer point of the teeth
- float xRoot0, yRoot0, xShaft0, yShaft0;
- float xRoot3, yRoot3, xShaft3, yShaft3;
- float xRoot4, yRoot4, xShaft4, yShaft4;
-
- // Temporary variables for storing coordinates and vectors
- Point3f coordinate = new Point3f(0.0f, 0.0f, 0.0f);
-
- // Gear start differential angle. All gears are constructed with the
- // center of a tooth at Z-axis angle = 0.
- double gearStartAngle = -1.0 * toothTopCenterAngle;
-
- // Temporaries that store start angle for each portion of tooth facet
- double toothStartAngle, toothTopStartAngle,
- toothDeclineStartAngle, toothValleyStartAngle,
- nextToothStartAngle;
-
- Shape3D newShape;
- int index;
-
- // The z coordinates for the body disks
- final float frontZ = -0.5f * thickness;
- final float rearZ = 0.5f * thickness;
-
- /* Construct the gear's front body (front facing torus disk)
- * __2__
- * - | - 4
- * - /| /-
- * / / | /| \
- * 0\ / | / / >
- * \ / | / | >
- * \ / | / / |
- * \ / ____|/ | >
- * \-- --__/ |
- * 1 3 5
- *
- */
- gearBodySegmentVertexCount = 4;
- gearBodyTotalVertexCount = 2 + gearBodySegmentVertexCount * toothCount;
- gearBodyStripCount[0] = gearBodyTotalVertexCount;
-
- TriangleStripArray frontGearBody
- = new TriangleStripArray(gearBodyTotalVertexCount,
- GeometryArray.COORDINATES
- | GeometryArray.NORMALS,
- gearBodyStripCount);
-
- xDirection = (float)Math.cos(gearStartAngle);
- yDirection = (float)Math.sin(gearStartAngle);
- xShaft0 = shaftRadius * xDirection;
- yShaft0 = shaftRadius * yDirection;
- xRoot0 = bodyOuterRadius * xDirection;
- yRoot0 = bodyOuterRadius * yDirection;
-
- coordinate.set(xRoot0, yRoot0, frontZ);
- frontGearBody.setCoordinate(0, coordinate);
- frontGearBody.setNormal(0, frontNormal);
-
- coordinate.set(xShaft0, yShaft0, frontZ);
- frontGearBody.setCoordinate(1, coordinate);
- frontGearBody.setNormal(1, frontNormal);
-
- for(int count = 0; count < toothCount; count++) {
- index = 2 + count * 4;
- toothStartAngle
- = gearStartAngle + circularPitchAngle * (double)count;
- toothValleyStartAngle
- = toothStartAngle + toothValleyAngleIncrement;
- nextToothStartAngle = toothStartAngle + circularPitchAngle;
-
- xDirection = (float)Math.cos(toothValleyStartAngle);
- yDirection = (float)Math.sin(toothValleyStartAngle);
- xShaft3 = shaftRadius * xDirection;
- yShaft3 = shaftRadius * yDirection;
- xRoot3 = bodyOuterRadius * xDirection;
- yRoot3 = bodyOuterRadius * yDirection;
-
- xDirection = (float)Math.cos(nextToothStartAngle);
- yDirection = (float)Math.sin(nextToothStartAngle);
- xShaft4 = shaftRadius * xDirection;
- yShaft4 = shaftRadius * yDirection;
- xRoot4 = bodyOuterRadius * xDirection;
- yRoot4 = bodyOuterRadius * yDirection;
-
- coordinate.set(xRoot3, yRoot3, frontZ);
- frontGearBody.setCoordinate(index, coordinate);
- frontGearBody.setNormal(index, frontNormal);
-
- coordinate.set(xShaft3, yShaft3, frontZ);
- frontGearBody.setCoordinate(index + 1, coordinate);
- frontGearBody.setNormal(index + 1, frontNormal);
-
- coordinate.set(xRoot4, yRoot4, frontZ);
- frontGearBody.setCoordinate(index + 2, coordinate);
- frontGearBody.setNormal(index + 2, frontNormal);
-
- coordinate.set(xShaft4, yShaft4, frontZ);
- frontGearBody.setCoordinate(index + 3, coordinate);
- frontGearBody.setNormal(index + 3, frontNormal);
- }
- newShape = new Shape3D(frontGearBody, look);
- this.addChild(newShape);
-
- // Construct the gear's rear body (rear facing torus disc)
- TriangleStripArray rearGearBody
- = new TriangleStripArray(gearBodyTotalVertexCount,
- GeometryArray.COORDINATES
- | GeometryArray.NORMALS,
- gearBodyStripCount);
- xDirection = (float)Math.cos(gearStartAngle);
- yDirection = (float)Math.sin(gearStartAngle);
- xShaft0 = shaftRadius * xDirection;
- yShaft0 = shaftRadius * yDirection;
- xRoot0 = bodyOuterRadius * xDirection;
- yRoot0 = bodyOuterRadius * yDirection;
-
- coordinate.set(xShaft0, yShaft0, rearZ);
- rearGearBody.setCoordinate(0, coordinate);
- rearGearBody.setNormal(0, rearNormal);
-
- coordinate.set(xRoot0, yRoot0, rearZ);
- rearGearBody.setCoordinate(1, coordinate);
- rearGearBody.setNormal(1, rearNormal);
-
- for(int count = 0; count < toothCount; count++) {
- index = 2 + count * 4;
- toothStartAngle
- = gearStartAngle + circularPitchAngle * (double)count;
- toothValleyStartAngle
- = toothStartAngle + toothValleyAngleIncrement;
- nextToothStartAngle = toothStartAngle + circularPitchAngle;
-
- xDirection = (float)Math.cos(toothValleyStartAngle);
- yDirection = (float)Math.sin(toothValleyStartAngle);
- xShaft3 = shaftRadius * xDirection;
- yShaft3 = shaftRadius * yDirection;
- xRoot3 = bodyOuterRadius * xDirection;
- yRoot3 = bodyOuterRadius * yDirection;
-
- xDirection = (float)Math.cos(nextToothStartAngle);
- yDirection = (float)Math.sin(nextToothStartAngle);
- xShaft4 = shaftRadius * xDirection;
- yShaft4 = shaftRadius * yDirection;
- xRoot4 = bodyOuterRadius * xDirection;
- yRoot4 = bodyOuterRadius * yDirection;
-
- coordinate.set(xShaft3, yShaft3, rearZ);
- rearGearBody.setCoordinate(index, coordinate);
- rearGearBody.setNormal(index, rearNormal);
-
- coordinate.set(xRoot3, yRoot3, rearZ);
- rearGearBody.setCoordinate(index + 1, coordinate);
- rearGearBody.setNormal(index + 1, rearNormal);
-
- coordinate.set(xShaft4, yShaft4, rearZ);
- rearGearBody.setCoordinate(index + 2, coordinate);
- rearGearBody.setNormal(index + 2, rearNormal);
-
- coordinate.set(xRoot4, yRoot4, rearZ);
- rearGearBody.setCoordinate(index + 3, coordinate);
- rearGearBody.setNormal(index + 3, rearNormal);
-
- }
- newShape = new Shape3D(rearGearBody, look);
- this.addChild(newShape);
- }
-
- void addCylinderSkins(float shaftRadius, float length,
- int normalDirection, Appearance look) {
- int insideShaftVertexCount; // #(vertices) for shaft
- int insideShaftStripCount[] = new int[1]; // #(vertices) in strip/strip
- double toothStartAngle, nextToothStartAngle, toothValleyStartAngle;
-
- // A ray from the gear center, used in normal calculations
- float xDirection, yDirection;
-
- // The z coordinates for the body disks
- final float frontZ = -0.5f * length;
- final float rearZ = 0.5f * length;
-
- // Temporary variables for storing coordinates, points, and vectors
- float xShaft3, yShaft3, xShaft4, yShaft4;
- Point3f coordinate = new Point3f(0.0f, 0.0f, 0.0f);
- Vector3f surfaceNormal = new Vector3f();
-
- Shape3D newShape;
- int index;
- int firstIndex;
- int secondIndex;
-
-
- /*
- * Construct gear's inside shaft cylinder
- * First the tooth's up, flat outer, and down distances
- * Second the tooth's flat inner distance
- *
- * Outward facing vertex order:
- * 0_______2____4
- * | /| /|
- * | / | / |
- * | / | / |
- * |/______|/___|
- * 1 3 5
- *
- * Inward facing vertex order:
- * 1_______3____5
- * |\ |\ |
- * | \ | \ |
- * | \ | \ |
- * |______\|___\|
- * 0 2 4
- */
- insideShaftVertexCount = 4 * toothCount + 2;
- insideShaftStripCount[0] = insideShaftVertexCount;
-
- TriangleStripArray insideShaft
- = new TriangleStripArray(insideShaftVertexCount,
- GeometryArray.COORDINATES
- | GeometryArray.NORMALS,
- insideShaftStripCount);
- xShaft3 = shaftRadius * (float)Math.cos(gearStartAngle);
- yShaft3 = shaftRadius * (float)Math.sin(gearStartAngle);
-
- if (normalDirection == OutwardNormals) {
- surfaceNormal.set(1.0f, 0.0f, 0.0f);
- firstIndex = 1;
- secondIndex = 0;
- } else {
- surfaceNormal.set(-1.0f, 0.0f, 0.0f);
- firstIndex = 0;
- secondIndex = 1;
- }
-
- // Coordinate labeled 0 in the strip
- coordinate.set(shaftRadius, 0.0f, frontZ);
- insideShaft.setCoordinate(firstIndex, coordinate);
- insideShaft.setNormal(firstIndex, surfaceNormal);
-
- // Coordinate labeled 1 in the strip
- coordinate.set(shaftRadius, 0.0f, rearZ);
- insideShaft.setCoordinate(secondIndex, coordinate);
- insideShaft.setNormal(secondIndex, surfaceNormal);
-
- for(int count = 0; count < toothCount; count++) {
- index = 2 + count * 4;
-
- toothStartAngle = circularPitchAngle * (double)count;
- toothValleyStartAngle
- = toothStartAngle + toothValleyAngleIncrement;
- nextToothStartAngle = toothStartAngle + circularPitchAngle;
-
- xDirection = (float)Math.cos(toothValleyStartAngle);
- yDirection = (float)Math.sin(toothValleyStartAngle);
- xShaft3 = shaftRadius * xDirection;
- yShaft3 = shaftRadius * yDirection;
- if (normalDirection == OutwardNormals)
- surfaceNormal.set(xDirection, yDirection, 0.0f);
- else
- surfaceNormal.set(-xDirection, -yDirection, 0.0f);
-
- // Coordinate labeled 2 in the strip
- coordinate.set(xShaft3, yShaft3, frontZ);
- insideShaft.setCoordinate(index + firstIndex, coordinate);
- insideShaft.setNormal(index + firstIndex, surfaceNormal);
-
- // Coordinate labeled 3 in the strip
- coordinate.set(xShaft3, yShaft3, rearZ);
- insideShaft.setCoordinate(index + secondIndex, coordinate);
- insideShaft.setNormal(index + secondIndex, surfaceNormal);
-
- xDirection = (float)Math.cos(nextToothStartAngle);
- yDirection = (float)Math.sin(nextToothStartAngle);
- xShaft4 = shaftRadius * xDirection;
- yShaft4 = shaftRadius * yDirection;
- if (normalDirection == OutwardNormals)
- surfaceNormal.set(xDirection, yDirection, 0.0f);
- else
- surfaceNormal.set(-xDirection, -yDirection, 0.0f);
-
- // Coordinate labeled 4 in the strip
- coordinate.set(xShaft4, yShaft4, frontZ);
- insideShaft.setCoordinate(index + 2 + firstIndex, coordinate);
- insideShaft.setNormal(index + 2 + firstIndex, surfaceNormal);
-
- // Coordinate labeled 5 in the strip
- coordinate.set(xShaft4, yShaft4, rearZ);
- insideShaft.setCoordinate(index + 2 + secondIndex, coordinate);
- insideShaft.setNormal(index + 2 + secondIndex, surfaceNormal);
-
- }
- newShape = new Shape3D(insideShaft, look);
- this.addChild(newShape);
- }
-
- public float getToothTopCenterAngle() {
- return toothTopCenterAngle;
- }
-
- public float getValleyCenterAngle() {
- return valleyCenterAngle;
- }
-
- public float getCircularPitchAngle() {
- return circularPitchAngle;
- }
-}
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