Java tutorial
/* * @(#)GearTest.java 1.17 02/10/21 13:40:16 * * Copyright (c) 1996-2002 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: - * Redistributions 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 AND ITS LICENSORS SHALL NOT BE * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING * OR DISTRIBUTING THE 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 SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY * OF SUCH DAMAGES. * * You acknowledge that Software is not designed,licensed or intended for use in * the design, construction, operation or maintenance of any nuclear facility. */ import java.applet.Applet; import java.awt.BorderLayout; import java.awt.GraphicsConfiguration; import javax.media.j3d.Alpha; import javax.media.j3d.AmbientLight; import javax.media.j3d.Appearance; import javax.media.j3d.Background; import javax.media.j3d.BoundingSphere; import javax.media.j3d.BranchGroup; import javax.media.j3d.Canvas3D; import javax.media.j3d.DirectionalLight; import javax.media.j3d.GeometryArray; import javax.media.j3d.Material; import javax.media.j3d.QuadArray; import javax.media.j3d.RotationInterpolator; import javax.media.j3d.Shape3D; import javax.media.j3d.Transform3D; import javax.media.j3d.TransformGroup; import javax.media.j3d.TriangleFanArray; import javax.media.j3d.TriangleStripArray; import javax.vecmath.Color3f; import javax.vecmath.Point3d; import javax.vecmath.Point3f; import javax.vecmath.Vector3d; import javax.vecmath.Vector3f; import com.sun.j3d.utils.applet.MainFrame; import com.sun.j3d.utils.behaviors.vp.OrbitBehavior; import com.sun.j3d.utils.universe.SimpleUniverse; import com.sun.j3d.utils.universe.ViewingPlatform; public class GearTest extends Applet { static final int defaultToothCount = 24; private int toothCount; private SimpleUniverse u = null; public BranchGroup createSceneGraph(int toothCount) { // Create the root of the branch graph BranchGroup objRoot = new BranchGroup(); // Create a Transformgroup to scale all objects so they // appear in the scene. TransformGroup objScale = new TransformGroup(); Transform3D t3d = new Transform3D(); t3d.setScale(0.4); objScale.setTransform(t3d); objRoot.addChild(objScale); // Create a bounds for the background and lights BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0); // Set up the background Color3f bgColor = new Color3f(0.05f, 0.05f, 0.2f); Background bgNode = new Background(bgColor); bgNode.setApplicationBounds(bounds); objScale.addChild(bgNode); // Set up the global lights Color3f light1Color = new Color3f(1.0f, 1.0f, 0.9f); Vector3f light1Direction = new Vector3f(4.0f, -7.0f, -12.0f); Color3f light2Color = new Color3f(0.3f, 0.3f, 0.4f); Vector3f light2Direction = new Vector3f(-6.0f, -2.0f, -1.0f); Color3f ambientColor = new Color3f(0.1f, 0.1f, 0.1f); AmbientLight ambientLightNode = new AmbientLight(ambientColor); ambientLightNode.setInfluencingBounds(bounds); objScale.addChild(ambientLightNode); DirectionalLight light1 = new DirectionalLight(light1Color, light1Direction); light1.setInfluencingBounds(bounds); objScale.addChild(light1); DirectionalLight light2 = new DirectionalLight(light2Color, light2Direction); light2.setInfluencingBounds(bounds); objScale.addChild(light2); // Create the transform group node and initialize it to the // identity. Enable the TRANSFORM_WRITE capability so that // our behavior code can modify it at runtime. Add it to the // root of the subgraph. TransformGroup objTrans = new TransformGroup(); objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE); objScale.addChild(objTrans); // Create an Appearance. Appearance look = new Appearance(); Color3f objColor = new Color3f(0.5f, 0.5f, 0.6f); Color3f black = new Color3f(0.0f, 0.0f, 0.0f); Color3f white = new Color3f(1.0f, 1.0f, 1.0f); look.setMaterial(new Material(objColor, black, objColor, white, 100.0f)); // Create a gear, add it to the scene graph. // SpurGear gear = new SpurGear(toothCount, 1.0f, 0.2f, SpurGear gear = new SpurGearThinBody(toothCount, 1.0f, 0.2f, 0.05f, 0.05f, 0.3f, 0.28f, look); objTrans.addChild(gear); // Create a new Behavior object that will rotate the object and // add it into the scene graph. Transform3D yAxis = new Transform3D(); Alpha rotationAlpha = new Alpha(-1, Alpha.INCREASING_ENABLE, 0, 0, 8000, 0, 0, 0, 0, 0); RotationInterpolator rotator = new RotationInterpolator(rotationAlpha, objTrans, yAxis, 0.0f, (float) Math.PI * 2.0f); rotator.setSchedulingBounds(bounds); objTrans.addChild(rotator); // Have Java 3D perform optimizations on this scene graph. objRoot.compile(); return objRoot; } public GearTest() { this(defaultToothCount); } public GearTest(int toothCount) { this.toothCount = toothCount; } public void init() { setLayout(new BorderLayout()); GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration(); Canvas3D c = new Canvas3D(config); add("Center", c); // Create a simple scene and attach it to the virtual universe BranchGroup scene = createSceneGraph(toothCount); u = new SimpleUniverse(c); // This will move the ViewPlatform back a bit so the // objects in the scene can be viewed. u.getViewingPlatform().setNominalViewingTransform(); u.addBranchGraph(scene); } public void destroy() { u.cleanup(); } // // The following allows GearTest to be run as an application // as well as an applet // public static void main(String[] args) { int value; if (args.length > 1) { System.out.println("Usage: java GearTest [#teeth]"); System.exit(0); } else if (args.length == 0) { new MainFrame(new GearTest(), 700, 700); } else { try { value = Integer.parseInt(args[0]); } catch (NumberFormatException e) { System.out.println("Illegal integer specified"); System.out.println("Usage: java GearTest [#teeth]"); value = 0; System.exit(0); } if (value <= 0) { System.out.println("Integer must be positive (> 0)"); System.out.println("Usage: java GearBox [#teeth]"); System.exit(0); } new MainFrame(new GearTest(value), 700, 700); } } } 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; } } class GearBox extends Applet { static final int defaultToothCount = 48; private int toothCount; private SimpleUniverse u = null; public BranchGroup createGearBox(int toothCount) { Transform3D tempTransform = new Transform3D(); // Create the root of the branch graph BranchGroup branchRoot = createBranchEnvironment(); // Create a Transformgroup to scale all objects so they // appear in the scene. TransformGroup objScale = new TransformGroup(); Transform3D t3d = new Transform3D(); t3d.setScale(0.4); objScale.setTransform(t3d); branchRoot.addChild(objScale); // Create an Appearance. Appearance look = new Appearance(); Color3f objColor = new Color3f(0.5f, 0.5f, 0.6f); Color3f black = new Color3f(0.0f, 0.0f, 0.0f); Color3f white = new Color3f(1.0f, 1.0f, 1.0f); look.setMaterial(new Material(objColor, black, objColor, white, 100.0f)); // Create the transform group node and initialize it to the // identity. Enable the TRANSFORM_WRITE capability so that // our behavior code can modify it at runtime. Add it to the // root of the subgraph. TransformGroup gearboxTrans = new TransformGroup(); gearboxTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE); gearboxTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_READ); objScale.addChild(gearboxTrans); // Create a bounds for the mouse behavior methods BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0); // Define the shaft base information int shaftCount = 4; int secondsPerRevolution = 8000; // Create the Shaft(s) Shaft shafts[] = new Shaft[shaftCount]; TransformGroup shaftTGs[] = new TransformGroup[shaftCount]; Alpha shaftAlphas[] = new Alpha[shaftCount]; RotationInterpolator shaftRotors[] = new RotationInterpolator[shaftCount]; Transform3D shaftAxis[] = new Transform3D[shaftCount]; // Note: the following arrays we're incorporated to make changing // the gearbox easier. float shaftRatios[] = new float[shaftCount]; shaftRatios[0] = 1.0f; shaftRatios[1] = 0.5f; shaftRatios[2] = 0.75f; shaftRatios[3] = 5.0f; float shaftRadius[] = new float[shaftCount]; shaftRadius[0] = 0.2f; shaftRadius[1] = 0.2f; shaftRadius[2] = 0.2f; shaftRadius[3] = 0.2f; float shaftLength[] = new float[shaftCount]; shaftLength[0] = 1.8f; shaftLength[1] = 0.8f; shaftLength[2] = 0.8f; shaftLength[3] = 0.8f; float shaftDirection[] = new float[shaftCount]; shaftDirection[0] = 1.0f; shaftDirection[1] = -1.0f; shaftDirection[2] = 1.0f; shaftDirection[3] = -1.0f; Vector3d shaftPlacement[] = new Vector3d[shaftCount]; shaftPlacement[0] = new Vector3d(-0.75, -0.9, 0.0); shaftPlacement[1] = new Vector3d(0.75, -0.9, 0.0); shaftPlacement[2] = new Vector3d(0.75, 0.35, 0.0); shaftPlacement[3] = new Vector3d(-0.75, 0.60, -0.7); // Create the shafts. for (int i = 0; i < shaftCount; i++) { shafts[i] = new Shaft(shaftRadius[i], shaftLength[i], 25, look); } // Create a transform group node for placing each shaft for (int i = 0; i < shaftCount; i++) { shaftTGs[i] = new TransformGroup(); gearboxTrans.addChild(shaftTGs[i]); shaftTGs[i].getTransform(tempTransform); tempTransform.setTranslation(shaftPlacement[i]); shaftTGs[i].setTransform(tempTransform); shaftTGs[i].addChild(shafts[i]); } // Add rotation interpolators to rotate the shaft in the appropriate // direction and at the appropriate rate for (int i = 0; i < shaftCount; i++) { shaftAlphas[i] = new Alpha(-1, Alpha.INCREASING_ENABLE, 0, 0, (long) (secondsPerRevolution * shaftRatios[i]), 0, 0, 0, 0, 0); shaftAxis[i] = new Transform3D(); shaftAxis[i].rotX(Math.PI / 2.0); shaftRotors[i] = new RotationInterpolator(shaftAlphas[i], shafts[i], shaftAxis[i], 0.0f, shaftDirection[i] * (float) Math.PI * 2.0f); shaftRotors[i].setSchedulingBounds(bounds); shaftTGs[i].addChild(shaftRotors[i]); } // Define the gear base information. Again, these arrays exist to // make the process of changing the GearBox via an editor faster int gearCount = 5; float valleyToCircularPitchRatio = .15f; float pitchCircleRadius = 1.0f; float addendum = 0.05f; float dedendum = 0.05f; float gearThickness = 0.3f; float toothTipThickness = 0.27f; // Create an array of gears and their associated information SpurGear gears[] = new SpurGear[gearCount]; TransformGroup gearTGs[] = new TransformGroup[gearCount]; int gearShaft[] = new int[gearCount]; gearShaft[0] = 0; gearShaft[1] = 1; gearShaft[2] = 2; gearShaft[3] = 0; gearShaft[4] = 3; float ratio[] = new float[gearCount]; ratio[0] = 1.0f; ratio[1] = 0.5f; ratio[2] = 0.75f; ratio[3] = 0.25f; ratio[4] = 1.25f; Vector3d placement[] = new Vector3d[gearCount]; placement[0] = new Vector3d(0.0, 0.0, 0.0); placement[1] = new Vector3d(0.0, 0.0, 0.0); placement[2] = new Vector3d(0.0, 0.0, 0.0); placement[3] = new Vector3d(0.0, 0.0, -0.7); placement[4] = new Vector3d(0.0, 0.0, 0.0); // Create the gears. for (int i = 0; i < gearCount; i++) { gears[i] = new SpurGearThinBody(((int) ((float) toothCount * ratio[i])), pitchCircleRadius * ratio[i], shaftRadius[0], addendum, dedendum, gearThickness, toothTipThickness, valleyToCircularPitchRatio, look); } // Create a transform group node for arranging the gears on a shaft // and attach the gear to its associated shaft for (int i = 0; i < gearCount; i++) { gearTGs[i] = new TransformGroup(); gearTGs[i].getTransform(tempTransform); tempTransform .rotZ((shaftDirection[gearShaft[i]] == -1.0) ? gears[i].getCircularPitchAngle() / -2.0f : 0.0f); tempTransform.setTranslation(placement[i]); gearTGs[i].setTransform(tempTransform); gearTGs[i].addChild(gears[i]); shafts[gearShaft[i]].addChild(gearTGs[i]); } // Have Java 3D perform optimizations on this scene graph. branchRoot.compile(); return branchRoot; } BranchGroup createBranchEnvironment() { // Create the root of the branch graph BranchGroup branchRoot = new BranchGroup(); // Create a bounds for the background and lights BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0); // Set up the background Color3f bgColor = new Color3f(0.05f, 0.05f, 0.5f); Background bgNode = new Background(bgColor); bgNode.setApplicationBounds(bounds); branchRoot.addChild(bgNode); // Set up the ambient light Color3f ambientColor = new Color3f(0.1f, 0.1f, 0.1f); AmbientLight ambientLightNode = new AmbientLight(ambientColor); ambientLightNode.setInfluencingBounds(bounds); branchRoot.addChild(ambientLightNode); // Set up the directional lights Color3f light1Color = new Color3f(1.0f, 1.0f, 0.9f); Vector3f light1Direction = new Vector3f(1.0f, 1.0f, 1.0f); Color3f light2Color = new Color3f(1.0f, 1.0f, 0.9f); Vector3f light2Direction = new Vector3f(-1.0f, -1.0f, -1.0f); DirectionalLight light1 = new DirectionalLight(light1Color, light1Direction); light1.setInfluencingBounds(bounds); branchRoot.addChild(light1); DirectionalLight light2 = new DirectionalLight(light2Color, light2Direction); light2.setInfluencingBounds(bounds); branchRoot.addChild(light2); return branchRoot; } public GearBox() { this(defaultToothCount); } public GearBox(int toothCount) { this.toothCount = toothCount; } public void init() { setLayout(new BorderLayout()); GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration(); Canvas3D c = new Canvas3D(config); add("Center", c); // Create the gearbox and attach it to the virtual universe BranchGroup scene = createGearBox(toothCount); u = new SimpleUniverse(c); // add mouse behaviors to the ViewingPlatform ViewingPlatform viewingPlatform = u.getViewingPlatform(); // This will move the ViewPlatform back a bit so the // objects in the scene can be viewed. viewingPlatform.setNominalViewingTransform(); // add orbit behavior to the ViewingPlatform OrbitBehavior orbit = new OrbitBehavior(c, OrbitBehavior.REVERSE_ALL); BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0); orbit.setSchedulingBounds(bounds); viewingPlatform.setViewPlatformBehavior(orbit); u.addBranchGraph(scene); } public void destroy() { u.cleanup(); } // // The following allows GearBox to be run as an application // as well as an applet // public static void main(String[] args) { int value; if (args.length > 1) { System.out.println("Usage: java GearBox #teeth (LCD 4)"); System.exit(0); } else if (args.length == 0) { new MainFrame(new GearBox(), 700, 700); } else { try { value = Integer.parseInt(args[0]); } catch (NumberFormatException e) { System.out.println("Illegal integer specified"); System.out.println("Usage: java GearBox #teeth (LCD 4)"); value = 0; System.exit(0); } if (value <= 0 | (value % 4) != 0) { System.out.println("Integer not a positive multiple of 4"); System.out.println("Usage: java GearBox #teeth (LCD 4)"); System.exit(0); } new MainFrame(new GearBox(value), 700, 700); } } } class SpurGear extends Gear { float toothTopAngleIncrement; float toothDeclineAngleIncrement; float rootRadius; float outsideRadius; //The angle subtended by the ascending or descending portion of a tooth float circularToothEdgeAngle; // The angle subtended by a flat (either a tooth top or a valley // between teeth float circularToothFlatAngle; /** * internal constructor for SpurGear, used by subclasses to establish * SpurGear's required state * * @return a new spur gear that contains sufficient information to continue * building * @param toothCount * number of teeth * @param pitchCircleRadius * radius at center of teeth * @param addendum * distance from pitch circle to top of teeth * @param dedendum * distance from pitch circle to root of teeth * @param toothToValleyAngleRatio * the ratio of the angle subtended by the tooth to the angle * subtended by the valley (must be <= .25) */ SpurGear(int toothCount, float pitchCircleRadius, float addendum, float dedendum, float toothToValleyAngleRatio) { super(toothCount); // The angle about Z subtended by one tooth and its associated valley circularPitchAngle = (float) (2.0 * Math.PI / (double) toothCount); // The angle subtended by a flat (either a tooth top or a valley // between teeth circularToothFlatAngle = circularPitchAngle * toothToValleyAngleRatio; //The angle subtended by the ascending or descending portion of a tooth circularToothEdgeAngle = circularPitchAngle / 2.0f - circularToothFlatAngle; // Increment angles toothTopAngleIncrement = circularToothEdgeAngle; toothDeclineAngleIncrement = toothTopAngleIncrement + circularToothFlatAngle; toothValleyAngleIncrement = toothDeclineAngleIncrement + circularToothEdgeAngle; // Differential angles for offsetting to the center of tooth's top // and valley toothTopCenterAngle = toothTopAngleIncrement + circularToothFlatAngle / 2.0f; valleyCenterAngle = toothValleyAngleIncrement + circularToothFlatAngle / 2.0f; // Gear start differential angle. All gears are constructed with the // center of a tooth at Z-axis angle = 0. gearStartAngle = -1.0 * toothTopCenterAngle; // The radial distance to the root and top of the teeth, respectively rootRadius = pitchCircleRadius - dedendum; outsideRadius = pitchCircleRadius + addendum; // Allow this object to spin. etc. this.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE); } /** * Construct a SpurGear; * * @return a new spur gear that conforms to the input paramters * @param toothCount * number of teeth * @param pitchCircleRadius * radius at center of teeth * @param shaftRadius * radius of hole at center * @param addendum * distance from pitch circle to top of teeth * @param dedendum * distance from pitch circle to root of teeth * @param gearThickness * thickness of the gear */ public SpurGear(int toothCount, float pitchCircleRadius, float shaftRadius, float addendum, float dedendum, float gearThickness) { this(toothCount, pitchCircleRadius, shaftRadius, addendum, dedendum, gearThickness, gearThickness, 0.25f, null); } /** * Construct a SpurGear; * * @return a new spur gear that conforms to the input paramters * @param toothCount * number of teeth * @param pitchCircleRadius * radius at center of teeth * @param shaftRadius * radius of hole at center * @param addendum * distance from pitch circle to top of teeth * @param dedendum * distance from pitch circle to root of teeth * @param gearThickness * thickness of the gear * @param look * the gear's appearance */ public SpurGear(int toothCount, float pitchCircleRadius, float shaftRadius, float addendum, float dedendum, float gearThickness, Appearance look) { this(toothCount, pitchCircleRadius, shaftRadius, addendum, dedendum, gearThickness, gearThickness, 0.25f, look); } /** * Construct a SpurGear; * * @return a new spur gear that conforms to the input paramters * @param toothCount * number of teeth * @param pitchCircleRadius * radius at center of teeth * @param shaftRadius * radius of hole at center * @param addendum * distance from pitch circle to top of teeth * @param dedendum * distance from pitch circle to root of teeth * @param gearThickness * thickness of the gear * @param toothTipThickness * thickness of the tip of the tooth * @param look * the gear's appearance */ public SpurGear(int toothCount, float pitchCircleRadius, float shaftRadius, float addendum, float dedendum, float gearThickness, float toothTipThickness, Appearance look) { this(toothCount, pitchCircleRadius, shaftRadius, addendum, dedendum, gearThickness, toothTipThickness, 0.25f, look); } /** * Construct a SpurGear; * * @return a new spur gear that conforms to the input paramters * @param toothCount * number of teeth * @param pitchCircleRadius * radius at center of teeth * @param shaftRadius * radius of hole at center * @param addendum * distance from pitch circle to top of teeth * @param dedendum * distance from pitch circle to root of teeth * @param gearThickness * thickness of the gear * @param toothTipThickness * thickness of the tip of the tooth * @param toothToValleyAngleRatio * the ratio of the angle subtended by the tooth to the angle * subtended by the valley (must be <= .25) * @param look * the gear's appearance object */ public SpurGear(int toothCount, float pitchCircleRadius, float shaftRadius, float addendum, float dedendum, float gearThickness, float toothTipThickness, float toothToValleyAngleRatio, Appearance look) { this(toothCount, pitchCircleRadius, addendum, dedendum, toothToValleyAngleRatio); // Generate the gear's body disks addBodyDisks(shaftRadius, rootRadius, gearThickness, look); // Generate the gear's interior shaft addCylinderSkins(shaftRadius, gearThickness, InwardNormals, look); // Generate the gear's teeth addTeeth(pitchCircleRadius, rootRadius, outsideRadius, gearThickness, toothTipThickness, toothToValleyAngleRatio, look); } /** * Construct a SpurGear's teeth by adding the teeth shape nodes * * @param pitchCircleRadius * radius at center of teeth * @param rootRadius * distance from pitch circle to top of teeth * @param outsideRadius * distance from pitch circle to root of teeth * @param gearThickness * thickness of the gear * @param toothTipThickness * thickness of the tip of the tooth * @param toothToValleyAngleRatio * the ratio of the angle subtended by the tooth to the angle * subtended by the valley (must be <= .25) * @param look * the gear's appearance object */ void addTeeth(float pitchCircleRadius, float rootRadius, float outsideRadius, float gearThickness, float toothTipThickness, float toothToValleyAngleRatio, Appearance look) { int index; Shape3D newShape; // Temporaries that store start angle for each portion of tooth facet double toothStartAngle, toothTopStartAngle, toothDeclineStartAngle, toothValleyStartAngle, nextToothStartAngle; // 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; float xOuter1, yOuter1; float xOuter2, yOuter2; float xRoot3, yRoot3; float xRoot4, yRoot4; // The z coordinates for the gear final float frontZ = -0.5f * gearThickness; final float rearZ = 0.5f * gearThickness; // The z coordinates for the tooth tip of the gear final float toothTipFrontZ = -0.5f * toothTipThickness; final float toothTipRearZ = 0.5f * toothTipThickness; int toothFacetVertexCount; // #(vertices) per tooth facet int toothFacetCount; // #(facets) per tooth int toothFaceTotalVertexCount; // #(vertices) in all teeth int toothFaceStripCount[] = new int[toothCount]; // per tooth vertex count int topVertexCount; // #(vertices) for teeth tops int topStripCount[] = new int[1]; // #(vertices) in strip/strip // Front and rear facing normals for the teeth faces Vector3f frontToothNormal = new Vector3f(0.0f, 0.0f, -1.0f); Vector3f rearToothNormal = new Vector3f(0.0f, 0.0f, 1.0f); // Normals for teeth tops up incline, tooth top, and down incline Vector3f leftNormal = new Vector3f(-1.0f, 0.0f, 0.0f); Vector3f rightNormal = new Vector3f(1.0f, 0.0f, 0.0f); Vector3f outNormal = new Vector3f(1.0f, 0.0f, 0.0f); Vector3f inNormal = 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); Point3f tempCoordinate1 = new Point3f(0.0f, 0.0f, 0.0f); Point3f tempCoordinate2 = new Point3f(0.0f, 0.0f, 0.0f); Point3f tempCoordinate3 = new Point3f(0.0f, 0.0f, 0.0f); Vector3f tempVector1 = new Vector3f(0.0f, 0.0f, 0.0f); Vector3f tempVector2 = new Vector3f(0.0f, 0.0f, 0.0f); /* * Construct the gear's front facing teeth facets 0______2 / /\ / / \ / / \ * //___________\ 1 3 */ toothFacetVertexCount = 4; toothFaceTotalVertexCount = toothFacetVertexCount * toothCount; for (int i = 0; i < toothCount; i++) toothFaceStripCount[i] = toothFacetVertexCount; TriangleStripArray frontGearTeeth = new TriangleStripArray(toothFaceTotalVertexCount, GeometryArray.COORDINATES | GeometryArray.NORMALS, toothFaceStripCount); for (int count = 0; count < toothCount; count++) { index = count * toothFacetVertexCount; toothStartAngle = gearStartAngle + circularPitchAngle * (double) count; toothTopStartAngle = toothStartAngle + toothTopAngleIncrement; toothDeclineStartAngle = toothStartAngle + toothDeclineAngleIncrement; toothValleyStartAngle = toothStartAngle + toothValleyAngleIncrement; xRoot0 = rootRadius * (float) Math.cos(toothStartAngle); yRoot0 = rootRadius * (float) Math.sin(toothStartAngle); xOuter1 = outsideRadius * (float) Math.cos(toothTopStartAngle); yOuter1 = outsideRadius * (float) Math.sin(toothTopStartAngle); xOuter2 = outsideRadius * (float) Math.cos(toothDeclineStartAngle); yOuter2 = outsideRadius * (float) Math.sin(toothDeclineStartAngle); xRoot3 = rootRadius * (float) Math.cos(toothValleyStartAngle); yRoot3 = rootRadius * (float) Math.sin(toothValleyStartAngle); tempCoordinate1.set(xRoot0, yRoot0, frontZ); tempCoordinate2.set(xRoot3, yRoot3, frontZ); tempVector1.sub(tempCoordinate2, tempCoordinate1); tempCoordinate2.set(xOuter1, yOuter1, toothTipFrontZ); tempVector2.sub(tempCoordinate2, tempCoordinate1); frontToothNormal.cross(tempVector1, tempVector2); frontToothNormal.normalize(); coordinate.set(xOuter1, yOuter1, toothTipFrontZ); frontGearTeeth.setCoordinate(index, coordinate); frontGearTeeth.setNormal(index, frontToothNormal); coordinate.set(xRoot0, yRoot0, frontZ); frontGearTeeth.setCoordinate(index + 1, coordinate); frontGearTeeth.setNormal(index + 1, frontToothNormal); coordinate.set(xOuter2, yOuter2, toothTipFrontZ); frontGearTeeth.setCoordinate(index + 2, coordinate); frontGearTeeth.setNormal(index + 2, frontToothNormal); coordinate.set(xRoot3, yRoot3, frontZ); frontGearTeeth.setCoordinate(index + 3, coordinate); frontGearTeeth.setNormal(index + 3, frontToothNormal); } newShape = new Shape3D(frontGearTeeth, look); this.addChild(newShape); /* * Construct the gear's rear facing teeth facets (Using Quads) 1______2 / \ / \ / \ * /____________\ 0 3 */ toothFacetVertexCount = 4; toothFaceTotalVertexCount = toothFacetVertexCount * toothCount; QuadArray rearGearTeeth = new QuadArray(toothCount * toothFacetVertexCount, GeometryArray.COORDINATES | GeometryArray.NORMALS); for (int count = 0; count < toothCount; count++) { index = count * toothFacetVertexCount; toothStartAngle = gearStartAngle + circularPitchAngle * (double) count; toothTopStartAngle = toothStartAngle + toothTopAngleIncrement; toothDeclineStartAngle = toothStartAngle + toothDeclineAngleIncrement; toothValleyStartAngle = toothStartAngle + toothValleyAngleIncrement; xRoot0 = rootRadius * (float) Math.cos(toothStartAngle); yRoot0 = rootRadius * (float) Math.sin(toothStartAngle); xOuter1 = outsideRadius * (float) Math.cos(toothTopStartAngle); yOuter1 = outsideRadius * (float) Math.sin(toothTopStartAngle); xOuter2 = outsideRadius * (float) Math.cos(toothDeclineStartAngle); yOuter2 = outsideRadius * (float) Math.sin(toothDeclineStartAngle); xRoot3 = rootRadius * (float) Math.cos(toothValleyStartAngle); yRoot3 = rootRadius * (float) Math.sin(toothValleyStartAngle); tempCoordinate1.set(xRoot0, yRoot0, rearZ); tempCoordinate2.set(xRoot3, yRoot3, rearZ); tempVector1.sub(tempCoordinate2, tempCoordinate1); tempCoordinate2.set(xOuter1, yOuter1, toothTipRearZ); tempVector2.sub(tempCoordinate2, tempCoordinate1); rearToothNormal.cross(tempVector2, tempVector1); rearToothNormal.normalize(); coordinate.set(xRoot0, yRoot0, rearZ); rearGearTeeth.setCoordinate(index, coordinate); rearGearTeeth.setNormal(index, rearToothNormal); coordinate.set(xOuter1, yOuter1, toothTipRearZ); rearGearTeeth.setCoordinate(index + 1, coordinate); rearGearTeeth.setNormal(index + 1, rearToothNormal); coordinate.set(xOuter2, yOuter2, toothTipRearZ); rearGearTeeth.setCoordinate(index + 2, coordinate); rearGearTeeth.setNormal(index + 2, rearToothNormal); coordinate.set(xRoot3, yRoot3, rearZ); rearGearTeeth.setCoordinate(index + 3, coordinate); rearGearTeeth.setNormal(index + 3, rearToothNormal); } newShape = new Shape3D(rearGearTeeth, look); this.addChild(newShape); /* * Construct the gear's top teeth faces (As seen from above) Root0 * Outer1 Outer2 Root3 Root4 (RearZ) 0_______3 2_______5 4_______7 * 6_______9 |0 3| |4 7| |8 11| |12 15| | | | | | | | | | | | | | | | | * |1_____2| |5_____6| |9____10| |13___14| 1 2 3 4 5 6 7 8 Root0 Outer1 * Outer2 Root3 Root4 (FrontZ) * * Quad 0123 uses a left normal Quad 2345 uses an out normal Quad 4567 * uses a right normal Quad 6789 uses an out normal */ topVertexCount = 8 * toothCount + 2; topStripCount[0] = topVertexCount; toothFacetVertexCount = 4; toothFacetCount = 4; QuadArray topGearTeeth = new QuadArray(toothCount * toothFacetVertexCount * toothFacetCount, GeometryArray.COORDINATES | GeometryArray.NORMALS); for (int count = 0; count < toothCount; count++) { index = count * toothFacetCount * toothFacetVertexCount; toothStartAngle = gearStartAngle + circularPitchAngle * (double) count; toothTopStartAngle = toothStartAngle + toothTopAngleIncrement; toothDeclineStartAngle = toothStartAngle + toothDeclineAngleIncrement; toothValleyStartAngle = toothStartAngle + toothValleyAngleIncrement; nextToothStartAngle = toothStartAngle + circularPitchAngle; xRoot0 = rootRadius * (float) Math.cos(toothStartAngle); yRoot0 = rootRadius * (float) Math.sin(toothStartAngle); xOuter1 = outsideRadius * (float) Math.cos(toothTopStartAngle); yOuter1 = outsideRadius * (float) Math.sin(toothTopStartAngle); xOuter2 = outsideRadius * (float) Math.cos(toothDeclineStartAngle); yOuter2 = outsideRadius * (float) Math.sin(toothDeclineStartAngle); xRoot3 = rootRadius * (float) Math.cos(toothValleyStartAngle); yRoot3 = rootRadius * (float) Math.sin(toothValleyStartAngle); xRoot4 = rootRadius * (float) Math.cos(nextToothStartAngle); yRoot4 = rootRadius * (float) Math.sin(nextToothStartAngle); // Compute normal for quad 1 tempCoordinate1.set(xRoot0, yRoot0, frontZ); tempCoordinate2.set(xOuter1, yOuter1, toothTipFrontZ); tempVector1.sub(tempCoordinate2, tempCoordinate1); leftNormal.cross(frontNormal, tempVector1); leftNormal.normalize(); // Coordinate labeled 0 in the quad coordinate.set(xRoot0, yRoot0, rearZ); topGearTeeth.setCoordinate(index, coordinate); topGearTeeth.setNormal(index, leftNormal); // Coordinate labeled 1 in the quad coordinate.set(tempCoordinate1); topGearTeeth.setCoordinate(index + 1, coordinate); topGearTeeth.setNormal(index + 1, leftNormal); // Coordinate labeled 2 in the quad topGearTeeth.setCoordinate(index + 2, tempCoordinate2); topGearTeeth.setNormal(index + 2, leftNormal); topGearTeeth.setCoordinate(index + 5, tempCoordinate2); // Coordinate labeled 3 in the quad coordinate.set(xOuter1, yOuter1, toothTipRearZ); topGearTeeth.setCoordinate(index + 3, coordinate); topGearTeeth.setNormal(index + 3, leftNormal); topGearTeeth.setCoordinate(index + 4, coordinate); // Compute normal for quad 2 tempCoordinate1.set(xOuter1, yOuter1, toothTipFrontZ); tempCoordinate2.set(xOuter2, yOuter2, toothTipFrontZ); tempVector1.sub(tempCoordinate2, tempCoordinate1); outNormal.cross(frontNormal, tempVector1); outNormal.normalize(); topGearTeeth.setNormal(index + 4, outNormal); topGearTeeth.setNormal(index + 5, outNormal); // Coordinate labeled 4 in the quad topGearTeeth.setCoordinate(index + 6, tempCoordinate2); topGearTeeth.setNormal(index + 6, outNormal); topGearTeeth.setCoordinate(index + 9, tempCoordinate2); // Coordinate labeled 5 in the quad coordinate.set(xOuter2, yOuter2, toothTipRearZ); topGearTeeth.setCoordinate(index + 7, coordinate); topGearTeeth.setNormal(index + 7, outNormal); topGearTeeth.setCoordinate(index + 8, coordinate); // Compute normal for quad 3 tempCoordinate1.set(xOuter2, yOuter2, toothTipFrontZ); tempCoordinate2.set(xRoot3, yRoot3, frontZ); tempVector1.sub(tempCoordinate2, tempCoordinate1); rightNormal.cross(frontNormal, tempVector1); rightNormal.normalize(); topGearTeeth.setNormal(index + 8, rightNormal); topGearTeeth.setNormal(index + 9, rightNormal); // Coordinate labeled 7 in the quad topGearTeeth.setCoordinate(index + 10, tempCoordinate2); topGearTeeth.setNormal(index + 10, rightNormal); topGearTeeth.setCoordinate(index + 13, tempCoordinate2); // Coordinate labeled 6 in the quad coordinate.set(xRoot3, yRoot3, rearZ); topGearTeeth.setCoordinate(index + 11, coordinate); topGearTeeth.setNormal(index + 11, rightNormal); topGearTeeth.setCoordinate(index + 12, coordinate); // Compute normal for quad 4 tempCoordinate1.set(xRoot3, yRoot3, frontZ); tempCoordinate2.set(xRoot4, yRoot4, frontZ); tempVector1.sub(tempCoordinate2, tempCoordinate1); outNormal.cross(frontNormal, tempVector1); outNormal.normalize(); topGearTeeth.setNormal(index + 12, outNormal); topGearTeeth.setNormal(index + 13, outNormal); // Coordinate labeled 9 in the quad topGearTeeth.setCoordinate(index + 14, tempCoordinate2); topGearTeeth.setNormal(index + 14, outNormal); // Coordinate labeled 8 in the quad coordinate.set(xRoot4, yRoot4, rearZ); topGearTeeth.setCoordinate(index + 15, coordinate); topGearTeeth.setNormal(index + 15, outNormal); // Prepare for the loop by computing the new normal toothTopStartAngle = nextToothStartAngle + toothTopAngleIncrement; xOuter1 = outsideRadius * (float) Math.cos(toothTopStartAngle); yOuter1 = outsideRadius * (float) Math.sin(toothTopStartAngle); tempCoordinate1.set(xRoot4, yRoot4, toothTipFrontZ); tempCoordinate2.set(xOuter1, yOuter1, toothTipFrontZ); tempVector1.sub(tempCoordinate2, tempCoordinate1); leftNormal.cross(frontNormal, tempVector1); leftNormal.normalize(); } newShape = new Shape3D(topGearTeeth, look); this.addChild(newShape); } } class SpurGearThinBody extends SpurGear { /** * Construct a SpurGearThinBody; * * @return a new spur gear that conforms to the input paramters * @param toothCount * number of teeth * @param pitchCircleRadius * radius at center of teeth * @param shaftRadius * radius of hole at center * @param addendum * distance from pitch circle to top of teeth * @param dedendum * distance from pitch circle to root of teeth * @param gearThickness * thickness of the gear */ public SpurGearThinBody(int toothCount, float pitchCircleRadius, float shaftRadius, float addendum, float dedendum, float gearThickness) { this(toothCount, pitchCircleRadius, shaftRadius, addendum, dedendum, gearThickness, gearThickness, 0.25f, null); } /** * Construct a SpurGearThinBody; * * @return a new spur gear that conforms to the input paramters * @param toothCount * number of teeth * @param pitchCircleRadius * radius at center of teeth * @param shaftRadius * radius of hole at center * @param addendum * distance from pitch circle to top of teeth * @param dedendum * distance from pitch circle to root of teeth * @param gearThickness * thickness of the gear * @param look * the gear's appearance */ public SpurGearThinBody(int toothCount, float pitchCircleRadius, float shaftRadius, float addendum, float dedendum, float gearThickness, Appearance look) { this(toothCount, pitchCircleRadius, shaftRadius, addendum, dedendum, gearThickness, gearThickness, 0.25f, look); } /** * Construct a SpurGearThinBody; * * @return a new spur gear that conforms to the input paramters * @param toothCount * number of teeth * @param pitchCircleRadius * radius at center of teeth * @param shaftRadius * radius of hole at center * @param addendum * distance from pitch circle to top of teeth * @param dedendum * distance from pitch circle to root of teeth * @param gearThickness * thickness of the gear * @param toothTipThickness * thickness of the tip of the tooth * @param look * the gear's appearance */ public SpurGearThinBody(int toothCount, float pitchCircleRadius, float shaftRadius, float addendum, float dedendum, float gearThickness, float toothTipThickness, Appearance look) { this(toothCount, pitchCircleRadius, shaftRadius, addendum, dedendum, gearThickness, toothTipThickness, 0.25f, look); } /** * Construct a SpurGearThinBody; * * @return a new spur gear that conforms to the input paramters * @param toothCount * number of teeth * @param pitchCircleRadius * radius at center of teeth * @param shaftRadius * radius of hole at center * @param addendum * distance from pitch circle to top of teeth * @param dedendum * distance from pitch circle to root of teeth * @param gearThickness * thickness of the gear * @param toothTipThickness * thickness of the tip of the tooth * @param toothToValleyRatio * ratio of tooth valley to circular pitch (must be <= .25) * @param look * the gear's appearance object */ public SpurGearThinBody(int toothCount, float pitchCircleRadius, float shaftRadius, float addendum, float dedendum, float gearThickness, float toothTipThickness, float toothToValleyAngleRatio, Appearance look) { this(toothCount, pitchCircleRadius, shaftRadius, addendum, dedendum, gearThickness, toothTipThickness, 0.25f, look, 0.6f * gearThickness, 0.75f * (pitchCircleRadius - shaftRadius)); } /** * Construct a SpurGearThinBody; * * @return a new spur gear that conforms to the input paramters * @param toothCount * number of teeth * @param pitchCircleRadius * radius at center of teeth * @param shaftRadius * radius of hole at center * @param addendum * distance from pitch circle to top of teeth * @param dedendum * distance from pitch circle to root of teeth * @param gearThickness * thickness of the gear * @param toothTipThickness * thickness of the tip of the tooth * @param toothToValleyRatio * ratio of tooth valley to circular pitch (must be <= .25) * @param look * the gear's appearance object * @param bodyThickness * the thickness of the gear body * @param crossSectionWidth * the width of the depressed portion of the gear's body */ public SpurGearThinBody(int toothCount, float pitchCircleRadius, float shaftRadius, float addendum, float dedendum, float gearThickness, float toothTipThickness, float toothToValleyAngleRatio, Appearance look, float bodyThickness, float crossSectionWidth) { super(toothCount, pitchCircleRadius, addendum, dedendum, toothToValleyAngleRatio); float diskCrossSectionWidth = (rootRadius - shaftRadius - crossSectionWidth) / 2.0f; float outerShaftRadius = shaftRadius + diskCrossSectionWidth; float innerToothRadius = rootRadius - diskCrossSectionWidth; // Generate the gear's body disks, first by the shaft, then in // the body and, lastly, by the teeth addBodyDisks(shaftRadius, outerShaftRadius, gearThickness, look); addBodyDisks(innerToothRadius, rootRadius, gearThickness, look); addBodyDisks(outerShaftRadius, innerToothRadius, bodyThickness, look); // Generate the gear's "shaft" equivalents the two at the teeth // and the two at the shaft addCylinderSkins(innerToothRadius, gearThickness, InwardNormals, look); addCylinderSkins(outerShaftRadius, gearThickness, OutwardNormals, look); // Generate the gear's interior shaft addCylinderSkins(shaftRadius, gearThickness, InwardNormals, look); // Generate the gear's teeth addTeeth(pitchCircleRadius, rootRadius, outsideRadius, gearThickness, toothTipThickness, toothToValleyAngleRatio, look); } } 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); } }