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/**********************************************************
Copyright (C) 2001 Daniel Selman
First distributed with the book "Java 3D Programming"
by Daniel Selman and published by Manning Publications.
http://manning.com/selman
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation, version 2.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
The license can be found on the WWW at:
http://www.fsf.org/copyleft/gpl.html
Or by writing to:
Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Authors can be contacted at:
Daniel Selman: daniel@selman.org
If you make changes you think others would like, please
contact one of the authors or someone at the
www.j3d.org web site.
**************************************************************/
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.GraphicsConfigTemplate;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Label;
import java.awt.Panel;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.InputStream;
import java.net.URL;
import java.util.Vector;
import javax.media.j3d.Alpha;
import javax.media.j3d.AudioDevice;
import javax.media.j3d.Background;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.Bounds;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.GraphicsConfigTemplate3D;
import javax.media.j3d.Group;
import javax.media.j3d.Locale;
import javax.media.j3d.PhysicalBody;
import javax.media.j3d.PhysicalEnvironment;
import javax.media.j3d.PositionInterpolator;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.media.j3d.View;
import javax.media.j3d.ViewPlatform;
import javax.media.j3d.VirtualUniverse;
import javax.vecmath.Color3f;
import javax.vecmath.Point3d;
import javax.vecmath.Vector3d;
import com.sun.j3d.audioengines.javasound.JavaSoundMixer;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.ColorCube;
/**
* Creates a scene which plots a custom Alpha function (loaded from a file). In
* addition the Alpha is applied to a rendered object in a scene. Note: this
* example does not currently run as an Applet.
*/
public class CustomAlphaTest extends Java3dApplet implements ActionListener,
FileAlphaListener {
private static int m_kWidth = 600;
private static int m_kHeight = 600;
final int m_knLoopCount = 0;
final long m_kTimeStep = 200;
private FileAlpha m_Alpha = null;
private Vector m_EditFieldVector = null;
private BufferedImage m_Image = null;
private long m_CurrentTime = 0;
private float m_CurrentValue = 0;
// offsets and drawing information
private int m_nMaxHeight = 0;
private int m_nMaxWidth = 0;
private int m_nInsetX = 0;
private int m_nInsetY = 0;
private int m_nGraphMaxWidth = 0;
private int m_nGraphMaxHeight = 0;
private int m_nGraphInsetX = 0;
private int m_nGraphInsetY = 0;
private double m_ScaleX = 0;
public CustomAlphaTest() {
try {
// HACK:
// if we are running as an Applet
// the getWorkingDirectory() call will throw an NPE
// as we cannot call getCodeBase until "start" has been called
// (below).
m_Alpha = new FileAlpha(
new URL(getWorkingDirectory(), "values.xls"));
m_Image = new BufferedImage(m_kWidth, m_kHeight,
BufferedImage.TYPE_INT_RGB);
buildUi();
initJava3d();
} catch (Exception e) {
}
}
// we duplicate this code here for Applet support
public void start() {
if (m_Alpha != null)
return;
try {
m_Alpha = new FileAlpha(
new URL(getWorkingDirectory(), "values.xls"));
m_Image = new BufferedImage(m_kWidth, m_kHeight,
BufferedImage.TYPE_INT_RGB);
buildUi();
initJava3d();
} catch (Exception e) {
e.printStackTrace();
}
}
protected void addCanvas3D(Canvas3D c3d) {
Frame frame = new Frame("Custom Alpha Test");
Panel aPanel = new Panel();
aPanel.setLayout(new BorderLayout());
aPanel.add(c3d, BorderLayout.CENTER);
frame.add(aPanel);
frame.pack();
frame.setSize(new Dimension(320, 320));
frame.validate();
frame.setVisible(true);
doLayout();
}
protected void buildUi() {
m_EditFieldVector = new Vector(1);
addField("Loop Count", m_knLoopCount);
addButton("Update");
updateUi();
drawGraph();
repaint();
}
protected BranchGroup createSceneBranchGroup() {
BranchGroup objRoot = super.createSceneBranchGroup();
TransformGroup objTrans = new TransformGroup();
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
ColorCube cube = new ColorCube(2);
objTrans.addChild(cube);
FileAlpha fileAlpha = null;
try {
fileAlpha = new FileAlpha(new URL(getWorkingDirectory(),
"values.xls"), this);
} catch (Exception e) {
e.toString();
}
PositionInterpolator posInterpolator = new PositionInterpolator(
fileAlpha, objTrans, new Transform3D(), -6, 6);
posInterpolator.setSchedulingBounds(getApplicationBounds());
objTrans.addChild(posInterpolator);
objRoot.addChild(objTrans);
return objRoot;
}
// handle event from the GUI components we created
public void actionPerformed(ActionEvent event) {
if (event.getActionCommand().equals("Update") != false) {
updateAlpha();
updateUi();
drawGraph();
repaint();
}
}
protected void updateAlpha() {
if (m_Alpha != null)
m_Alpha.setLoopCount(Integer.parseInt(getField(m_knLoopCount)
.getText()));
}
protected void updateUi() {
if (m_Alpha != null)
getField(m_knLoopCount).setText(
String.valueOf(m_Alpha.getLoopCount()));
}
long getMaxTime() {
return m_Alpha.getStopTime();
}
protected void drawGraph() {
if (m_Alpha != null) {
Graphics g = m_Image.getGraphics();
g.setColor(Color.white);
g.fillRect(0, 0, m_kWidth, m_kHeight);
g.setColor(Color.black);
m_Alpha.setStartTime(0);
long lMaxTime = getMaxTime();
computeDrawScale(lMaxTime);
drawAxes(g, lMaxTime);
drawPhases(g, lMaxTime);
drawAlpha(g, lMaxTime);
}
}
protected TextField getField(final int nIndex) {
return (TextField) m_EditFieldVector.get(nIndex);
}
protected void addButton(final String szText) {
Button button = new Button(szText);
button.addActionListener(this);
add(button);
}
protected void addField(final String szText, final int nIndex) {
Label label = new Label(szText);
TextField textField = new TextField(4);
m_EditFieldVector.add(nIndex, (Object) textField);
add(label);
add(textField);
}
protected void computeDrawScale(long lMaxTime) {
int nWidth = getWidth();
int nHeight = getHeight();
if (nWidth > m_kWidth)
nWidth = m_kWidth;
if (nHeight > m_kHeight)
nHeight = m_kHeight;
m_nMaxHeight = (int) (nHeight * 0.7);
m_nMaxWidth = (int) (nWidth * 0.9);
m_nInsetX = (nWidth - m_nMaxWidth) / 2;
m_nInsetY = (int) ((nHeight - m_nMaxHeight) / 1.1);
m_nGraphMaxWidth = (int) (m_nMaxWidth * 0.80);
m_nGraphMaxHeight = (int) (m_nMaxHeight * 0.80);
m_nGraphInsetX = (m_nMaxWidth - m_nGraphMaxWidth) / 2;
m_nGraphInsetY = (m_nMaxHeight - m_nGraphMaxHeight) / 2;
m_ScaleX = ((double) m_nGraphMaxWidth) / ((double) lMaxTime);
}
protected void drawAreaRect(Graphics g, int x, int y, int width, int height) {
g.drawRect(x, y, width, height);
}
protected void drawAreaString(Graphics g, int nLen, String szText,
double x, double y) {
if (nLen > 0 && szText.length() > nLen)
szText = szText.substring(0, nLen);
g.drawString(szText, (int) x, (int) (m_nMaxHeight - y));
}
protected void drawGraphString(Graphics g, int nLen, String szText,
double x, double y) {
if (nLen > 0 && szText.length() > nLen)
szText = szText.substring(0, nLen);
g.drawString(szText, (int) (m_nGraphInsetX + x), (int) (m_nGraphInsetY
+ m_nGraphMaxHeight - y));
}
protected void drawGraphLine(Graphics g, double x1, double y1, double x2,
double y2) {
g.drawLine((int) (m_nGraphInsetX + x1), (int) (m_nGraphInsetY
+ m_nGraphMaxHeight - y1), (int) (m_nGraphInsetX + x2),
(int) (m_nGraphInsetY + m_nGraphMaxHeight - y2));
}
protected void drawGraphFillCircle(Graphics g, double x1, double y1,
double radius) {
g.fillOval((int) (m_nGraphInsetX + x1 - radius), (int) (m_nGraphInsetY
+ m_nGraphMaxHeight - y1 - radius), (int) (radius * 2),
(int) (radius * 2));
}
protected void drawAxes(Graphics g, long lMaxTime) {
// draw the frame
drawAreaRect(g, 0, 0, m_nMaxWidth, m_nMaxHeight);
drawGraphString(g, -1, "Alpha vs. Time (secs)", m_nGraphMaxWidth / 2,
m_nGraphMaxHeight + 20);
// draw the X axis
drawGraphLine(g, 0, 0, m_nGraphMaxWidth, 0);
// draw the Y axis
drawGraphLine(g, 0, 0, 0, m_nGraphMaxHeight);
// draw the horizontal Y axis lines
for (double yAxisTick = 0; yAxisTick <= 1.0; yAxisTick += 0.2) {
double yTick = yAxisTick * m_nGraphMaxHeight;
g.setColor(Color.gray);
drawGraphLine(g, 0, yTick, m_nGraphMaxWidth, yTick);
g.setColor(Color.black);
drawGraphString(g, 3, "" + yAxisTick, -20, yTick);
}
}
protected void drawPhases(Graphics g, long lMaxTime) {
double curTime = 0;
g.setColor(Color.darkGray);
int nLoop = 1;
if (m_Alpha.getLoopCount() > 0)
nLoop = m_Alpha.getLoopCount();
for (int n = 0; n < nLoop; n++) {
for (int nValue = 0; nValue < m_Alpha.getNumValues(); nValue++) {
curTime = n * m_Alpha.getMaxTime()
+ m_Alpha.getTimeForValue(nValue);
g.setColor(Color.black);
drawGraphString(g, -1, "" + (curTime / 1000), curTime
* m_ScaleX, -20);
g.setColor(Color.darkGray);
drawGraphLine(g, curTime * m_ScaleX, 0, curTime * m_ScaleX,
m_nGraphMaxHeight);
}
}
g.setColor(Color.black);
}
protected void drawAlpha(Graphics g, long lMaxTime) {
g.setColor(Color.blue);
float value = 0;
double x1 = 0;
double y1 = 0;
double x2 = 0;
double y2 = 0;
for (long lTime = 0; lTime <= lMaxTime; lTime += m_kTimeStep) {
value = m_Alpha.value(lTime);
x2 = lTime * m_ScaleX;
y2 = value * m_nGraphMaxHeight;
drawGraphLine(g, x1, y1, x2, y2);
x1 = x2;
y1 = y2;
}
g.setColor(Color.black);
}
protected void drawCurrentPosition(Graphics g) {
drawGraphFillCircle(g, m_nInsetX + m_CurrentTime * m_ScaleX,
m_CurrentValue * m_nGraphMaxHeight - m_nInsetY, 3);
}
public void onFileAlphaGetValue(long ltime, float value) {
m_CurrentTime = ltime % m_Alpha.getStopTime();
m_CurrentValue = value;
int repaintX = (int) (m_nGraphInsetX + m_nInsetX + m_CurrentTime
* m_ScaleX);
int repaintY = (int) (m_nGraphInsetY + m_nGraphMaxHeight - (m_CurrentValue
* m_nGraphMaxHeight - m_nInsetY));
Graphics g = getGraphics();
if (g != null) {
repaint(repaintX - 5, repaintY - 5, 10, 10);
drawCurrentPosition(g);
}
}
public void paint(Graphics g) {
super.paint(g);
if (m_Alpha != null) {
drawGraph();
g.drawImage(m_Image, m_nInsetX, m_nInsetY, this);
}
}
public static void main(String[] args) {
CustomAlphaTest alphaTest = new CustomAlphaTest();
new MainFrame(alphaTest, m_kWidth, m_kHeight);
}
}
//this class defines an Alpha class that reads time/alpha
//value pairs from a file and linearly interpolates between
//them. It illustrates creating your own Alpha class for
//interpolation.
class FileAlpha extends Alpha {
// store a Vector of AlphaPairs that define
// the Alpha value for each time
protected Vector m_AlphaVector = null;
// we override tracking of start and stop time
protected long m_StartTime = 0;
protected long m_StopTime = 0;
// we override tracking of loop count
protected int m_nLoopCount = -1;
protected FileAlphaListener m_Listener = null;
public FileAlpha(URL url) {
this(url, null);
}
public FileAlpha(URL url, FileAlphaListener listener) {
m_Listener = listener;
// create the vector used to store the AlphaPairs
m_AlphaVector = new Vector();
// read the AlphaPairs from the text file
readAlphaValues(url);
System.out.println("Read " + getNumValues() + " Alpha pairs.");
// initialize the start/stop times
m_StartTime = System.currentTimeMillis();
m_StopTime = m_StartTime + getMaxTime();
}
// this method is overriden to update the stop time
public void setStartTime(long l) {
m_StartTime = l;
if (m_nLoopCount > 0)
m_StopTime = m_StartTime + m_nLoopCount * getMaxTime();
else
m_StopTime = m_StartTime + getMaxTime();
}
// overriden to return our member variable
public long getStartTime() {
return m_StartTime;
}
public long getStopTime() {
return m_StopTime;
}
// overriden to update the stop time
public void setLoopCount(int i) {
m_nLoopCount = i;
if (m_nLoopCount > 0)
m_StopTime = m_StartTime + i * getMaxTime();
else
m_StopTime = m_StartTime + getMaxTime();
}
// overriden to return our member variable
public int getLoopCount() {
return m_nLoopCount;
}
// overriden to use our member variables
public boolean finished() {
if (m_nLoopCount == -1)
return false;
return (System.currentTimeMillis() - m_StartTime > m_StopTime);
}
// core method override
// returns the Alpha value for a given time
public float value(long time) {
if (time >= m_StartTime)
return valueFromStart(time - m_StartTime);
return 0;
}
// helper method to retrieve the AlphaPair
// to the left and right of the time and
// linearly interpolate between them.
//
// Note: this method could be optimized!
protected float valueFromStart(long time) {
long modTime = time;
float value = 0;
if (time > getMaxTime() && getMaxTime() > 0)
modTime = time % getMaxTime();
AlphaPair leftPair = getLeftPairFromTime(modTime);
AlphaPair rightPair = getRightPairFromTime(modTime);
if (leftPair != null && rightPair != null) {
float deltaAlpha = rightPair.getAlpha() - leftPair.getAlpha();
long deltaTime = rightPair.getTime() - leftPair.getTime();
float slope = 0;
if (deltaTime != 0)
slope = deltaAlpha / deltaTime;
long subTime = modTime - leftPair.getTime();
value = leftPair.getAlpha() + subTime * slope;
if (m_Listener != null)
m_Listener.onFileAlphaGetValue(time, value);
}
return value;
}
// returns the AlphaPair for a given index
protected AlphaPair getAlphaPairForIndex(int nIndex) {
if (nIndex < 0 || nIndex >= m_AlphaVector.size())
return null;
return (AlphaPair) m_AlphaVector.get(nIndex);
}
// returns an AlphaPair immediately to the
// left of the given time
protected AlphaPair getLeftPairFromTime(long time) {
AlphaPair alphaPair = null;
for (int nIndex = 0; nIndex < getNumValues(); nIndex++) {
alphaPair = getAlphaPairForIndex(nIndex);
if (alphaPair != null) {
if (alphaPair.getTime() == time)
return alphaPair;
if (alphaPair.getTime() > time) {
if (nIndex > 0)
return getAlphaPairForIndex(nIndex - 1);
else
break;
}
}
}
return alphaPair;
}
// returns an AlphaPair immediately to the
// right of the given time
protected AlphaPair getRightPairFromTime(long time) {
AlphaPair alphaPair = null;
for (int nIndex = 0; nIndex < getNumValues(); nIndex++) {
alphaPair = getAlphaPairForIndex(nIndex);
if (alphaPair != null && alphaPair.getTime() >= time)
return alphaPair;
}
return alphaPair;
}
// returns the number of AlphaPairs loaded
public int getNumValues() {
return m_AlphaVector.size();
}
// returns the time for the AlphaPair at
// a given index
public long getTimeForValue(int nIndex) {
AlphaPair alphaPair = getAlphaPairForIndex(nIndex);
if (alphaPair != null) {
return getAlphaPairForIndex(nIndex).getTime();
}
return 0;
}
// returns the maximum loaded AlphaPair time
public long getMaxTime() {
return getTimeForValue(getNumValues() - 1);
}
// read the AlphaPairs from a file.
protected void readAlphaValues(URL url) {
// allocate a temporary buffer to store the input file
StringBuffer szBufferData = new StringBuffer();
try {
InputStream inputStream = url.openStream();
int nChar = 0;
// read the entire file into the StringBuffer
while (true) {
nChar = inputStream.read();
// if we have not hit the end of file
// add the character to the StringBuffer
if (nChar != -1)
szBufferData.append((char) nChar);
else
// EOF
break;
}
inputStream.close();
// create a tokenizer to tokenize the input file at whitespace
java.util.StringTokenizer tokenizer = new java.util.StringTokenizer(
szBufferData.toString());
// keep reading time/alpha pairs until we hit EOF
while (true) {
try {
long time = Long.parseLong(tokenizer.nextToken());
float alpha = Float.parseFloat(tokenizer.nextToken
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