diff options
Diffstat (limited to 'src/GearTest/Gear.java')
| -rw-r--r-- | src/GearTest/Gear.java | 397 |
1 files changed, 397 insertions, 0 deletions
diff --git a/src/GearTest/Gear.java b/src/GearTest/Gear.java new file mode 100644 index 0000000..fbd0f03 --- /dev/null +++ b/src/GearTest/Gear.java @@ -0,0 +1,397 @@ +/* + * $RCSfile$ + * + * 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 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; + } +} |