Float to []byte
If I have this float (6.061.970.311.763.627), how to do for get an array of byte from this float (0x158954731256AB)?
There is not problem if it is a String ("158954731256AB") or two integer (0x00158954 0x731256AB).
jotremar wrote:
It is for a network protocol. It only work with bytes. All numbers are in different endianess.
If a want to send a int (4, for example), I have to send it with endianess (0x04000000). This protocol have numbers more great than int (I use float for it) Do NOT use float just to get numbers bigger than int. For one thing there will be holes--integers that are in float's range that can't be represented by float. ONLY use float or double if you want floating point numbers. If you just need bigger integers, stick to long or BigInteger.
and I have to make endianess to it (0x0400000000000000 => float = 4).That's wrong for two reasons.
1. Float is 4 bytes, just like int.
2. For the third bluddy time, 4 in a Java float is NOT 0x00000004. It is 0x40800000. A float's bite pattern for an integer is NOT the same as an int's bit pattern for the same integer.
Okay, three reasons, but I already told you the third, and it kind of goes along with #1 anyway, but I'll repeat it:
3. There are integers that int can represent that float cannot. And there are integers outside of int's range, but still in float's range that float cannot represent.
[SOME THINGS YOU SHOULD KNOW ABOUT FLOATING-POINT ARITHMETIC|http://java.sun.com/developer/JDCTechTips/2003/tt0204.html#2]
[What Every Computer Scientist Should Know About Floating-Point Arithmetic|http://docs.sun.com/source/806-3568/ncg_goldberg.html]
[Another good (slightly simpler) FP explanation|http://mindprod.com/jgloss/floatingpoint.html]
Edited by: jverd on Sep 10, 2009 3:43 PM
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else
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else
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EntryBox = new DataEntryBox(this,MastFile);
else
if(Path3 != null)
if(Path3.equals("null"))
EntryBox = new DataEntryBox(this,MastFile);
else
try
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else
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import java.awt.*;
import java.awt.event.*;
public class DelFace extends JFrame implements ActionListener, ItemListener
private GUI TkBar; //GUI object.
private FileOps Fops; //File Operations object.
private JCheckBox ckbox1; //Delete shortcut 1.
private JCheckBox ckbox2; //Delete shortcut 2.
private JCheckBox ckbox3; //Delete shortcut 3.
private JCheckBox ckbox4; //Delete shortcut 4.
private JCheckBox ckbox5; //Delete shortcut 5.
private JButton OkBtn; //OK button.
private JButton CnBtn; //Cancel button.
private JOptionPane confirm;
private boolean short1 = false; //Boolean variables indicate whether to
private boolean short2 = false; //delete a shortcut entry. True = delete.
private boolean short3 = false;
private boolean short4 = false;
private boolean short5 = false;
DelFace(GUI TkBar, FileOps Fops)
this.TkBar = TkBar;
this.Fops = Fops;
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension sSize = tk.getScreenSize();
Container dcon = getContentPane();
GridBagLayout gb = new GridBagLayout();
GridBagConstraints bagcon = new GridBagConstraints();
dcon.setLayout(gb);
bagcon.fill = GridBagConstraints.BOTH;
bagcon.gridwidth = GridBagConstraints.REMAINDER;
JLabel TLabel = new JLabel("Delete Wizard",JLabel.CENTER);
TLabel.setFont(new Font("Tahoma",Font.BOLD+Font.ITALIC,32));
bagcon.gridx = 0;
bagcon.gridy = 0;
bagcon.weightx = 1.0; //Take up all the 'x room' in this row.
bagcon.weighty = 0.5; //Take up all the 'y room' in this column.
/* The weightx and weighty values are required otherwise all components will
gravitate toward the center of screen. */
gb.setConstraints(TLabel,bagcon);
dcon.add(TLabel);
JTextArea TxArea = new JTextArea("Tick the box(s) of the shortcut(s)"+
" that you would like to delete and"+
" press the Delete button. Alternatively"+
" press the Cancel button to exit.");
TxArea.setLineWrap(true);
TxArea.setWrapStyleWord(true);
TxArea.setEditable(false);
TxArea.setFont(new Font("Times New Roman",Font.PLAIN,15));
TxArea.setBackground(this.getBackground());
bagcon.gridx = 0;
bagcon.gridy = 1;
gb.setConstraints(TxArea,bagcon);
dcon.add(TxArea);
bagcon.gridwidth = 1;
JPanel Nopan1 = new JPanel();
bagcon.gridx = 0;
bagcon.gridy = 2;
gb.setConstraints(Nopan1,bagcon);
dcon.add(Nopan1);
ckbox1 = new JCheckBox(TkBar.getBt1Text());
bagcon.gridx = 1;
bagcon.gridy = 2;
gb.setConstraints(ckbox1,bagcon);
dcon.add(ckbox1);
ckbox1.addItemListener(this);
ckbox2 = new JCheckBox(TkBar.getBt2Text());
bagcon.gridy = 3;
gb.setConstraints(ckbox2,bagcon);
dcon.add(ckbox2);
ckbox2.addItemListener(this);
ckbox3 = new JCheckBox(TkBar.getBt3Text());
bagcon.gridy = 4;
gb.setConstraints(ckbox3,bagcon);
dcon.add(ckbox3);
ckbox3.addItemListener(this);
ckbox4 = new JCheckBox(TkBar.getBt4Text());
bagcon.gridy = 5;
gb.setConstraints(ckbox4,bagcon);
dcon.add(ckbox4);
ckbox4.addItemListener(this);
ckbox5 = new JCheckBox(TkBar.getBt5Text());
bagcon.gridy = 6;
gb.setConstraints(ckbox5,bagcon);
dcon.add(ckbox5);
ckbox5.addItemListener(this);
JPanel Nopan2 = new JPanel();
bagcon.gridx = 1;
bagcon.gridy = 7;
gb.setConstraints(Nopan2,bagcon);
dcon.add(Nopan2);
OkBtn = new JButton("OK");
OkBtn.addActionListener(this);
bagcon.gridx = 1;
bagcon.gridy = 8;
gb.setConstraints(OkBtn,bagcon);
dcon.add(OkBtn);
OkBtn.addActionListener(this);
CnBtn = new JButton("Cancel");
CnBtn.addActionListener(this);
bagcon.gridx = 2;
bagcon.gridy = 8;
gb.setConstraints(CnBtn,bagcon);
dcon.add(CnBtn);
CnBtn.addActionListener(this);
JPanel Nopan3 = new JPanel();
bagcon.gridx = 3;
bagcon.gridy = 8;
gb.setConstraints(Nopan3,bagcon);
dcon.add(Nopan3);
JPanel Nopan4 = new JPanel();
bagcon.gridx = 0;
bagcon.gridy = 9;
gb.setConstraints(Nopan4,bagcon);
dcon.add(Nopan4);
setLocation(sSize.width*1/2,sSize.height*1/20);
setSize(sSize.width*1/2,sSize.height*4/5);
setTitle("Java QuickLaunch Toolbar");
setResizable(false);
setVisible(true);
public void actionPerformed(ActionEvent e)
{ /*--- Code of INTEREST begins here!!!!!! -------
if(e.getActionCommand().equals("OK"))
if(short1 || short2 || short3 || short4 || short5)
//confirm = new JOptionPane();
int n = confirm.showConfirmDialog(this,
"Do you really want to delete?","Delete Confirmation",
JOptionPane.YES_NO_OPTION);
if(n == confirm.YES_OPTION) //Works Fine!
while(short1 || short2 || short3 || short4 || short5)
if(short1)
TkBar.setBt1Action("Link1");
TkBar.setButton1("");
TkBar.setPath1("null");
Fops.setFDArray(0,"null");
Fops.setFDArray(1,"null");
short1 = false;
else
if(short2)
TkBar.setBt2Action("Link2");
TkBar.setButton2("");
TkBar.setPath2("null");
Fops.setFDArray(2,"null");
Fops.setFDArray(3,"null");
short2 = false;
else
if(short3)
TkBar.setBt3Action("Link3");
TkBar.setButton3("");
TkBar.setPath3("null");
Fops.setFDArray(4,"null");
Fops.setFDArray(5,"null");
short3 = false;
else
if(short4)
TkBar.setBt4Action("Link4");
TkBar.setButton4("");
TkBar.setPath4("null");
Fops.setFDArray(6,"null");
Fops.setFDArray(7,"null");
short4 = false;
else
if(short5)
TkBar.setBt5Action("Link5");
TkBar.setButton5("");
TkBar.setPath5("null");
Fops.setFDArray(8,"null");
Fops.setFDArray(9,"null");
short5 = false;
Fops.destroyFile(); //Destroy the old (outdated) file.
Fops.fileStatus(); //Create a new file.
Fops.writeFile(); //Write updated data to new file.
setVisible(false);
if(n == confirm.NO_OPTION) //** Does not work ***
System.out.println("No Option is being heard");
//Listeners are working.
//confirm.setVisible(false);
if(n == confirm.CLOSED_OPTION) //** Does not work ***
System.out.println("Closed Option is being heard");
//Listeners are working.
//confirm.setVisible(false);
--- Code of interest ENDS here --- */
else
if(e.getActionCommand().equals("Cancel"))
setVisible(false);
public void itemStateChanged(ItemEvent f)
int state = f.getStateChange();
if(state == ItemEvent.SELECTED) //If a checkbox has been selected.
if(f.getItem() == ckbox1)
short1 = true;
else
if(f.getItem() == ckbox2)
short2 = true;
else
if(f.getItem() == ckbox3)
short3 = true;
else
if(f.getItem() == ckbox4)
short4 = true;
else
if(f.getItem() == ckbox5)
short5 = true;
if(state == ItemEvent.DESELECTED) //If a checkbox has been deselected.
if(f.getItem() == ckbox1)
short1 = false;
else
if(f.getItem() == ckbox2)
short2 = false;
else
if(f.getItem() == ckbox3)
short3 = false;
else
if(f.getItem() == ckbox4)
short4 = false;
else
if(f.getItem() == ckbox5)
short5 = false;
}The code that is of interest to my current programming challenge is marked in the above code block like this:
//*** Code of INTEREST begins here!!!!!! ********** //
This is where my programming twilight behaviour begins to kick in. From the DelGUI object I now listen to a button event, this event when triggered causes a JOptionPane.showConfirmDialog(), as can be seen in the specified code block above. I make the JOptionPane centered over the DelGUI object ("JFrame No.: 2") which is also centered over the LauncherGUI object ("JFrame No.: 1").
The program begins to behave quite strangely after the creation of the JOptionPane object called confirm. The JOptionPane is presented on screen without any visiual difficulty but it behaves quite strangely when it's buttons are pressed. The JOptionPane contains three event sources, the YES, NO and Close buttons.
In my program the YES button causes a set of file operations to take place and then sets the "JFrame No.: 2"(DelGUI) invisible. It does this via the method setVisible(false). "JFrame No.: 2" is effectively the JOptionPane's parent component and as soon as it is setVisible(false) the JOptionPane is also cleared from the screen. I believe from my research that this is the JOptionPane's default behaviour, meaning that as soon as a button or event source is activated the JOptionPane will destroy itself.
The end of the trail is near, thankyou for reading this if you have got this far, and please carry on....
The Challenge:
The program does not behave as desired at the two points in the code commented as such: ** Does not work ***
if(n == confirm.NO_OPTION)
System.out.println("No Option is being heard");
//confirm.setVisible(false);
if(n == confirm.CLOSED_OPTION)
System.out.println("Closed Option is being heard");
//confirm.setVisible(false);
}If the NO_OPTION or the CLOSED_OPTION are pressed then the JOptionPane remains visible. After pressing the JoptionPane's button a second time it will disappear completely. I have tried a number of things in an attempt to work this out. Firstly I have inserted println messages to ensure that the events are being detected. These messages are always displayed whenever either the NO or Close buttons are pressed.
As these messages are being passed to the Standard Output, twice by the time the JOptionPane has disappeared, I can only assume that the events are being detected.
In addition to checking the event situation I have attempted to explicity set the JOptionPane invisible, in the form:
confirm.setVisible(false); The above line of code did not change the situation. Still I need two button clicks for the JOptionPane to display it's default behaviour which is to set itself invisible (or possibly the object is alloted to garbage collection), either way it is no longer on screen. I have also tried this code with no if statements related to NO_OPTION and CLOSE_OPTION. This was done in an attempt to allow the default behaviour to take place. Unfortunately two presses were still required in this situation.
A forum member mentioned the possibility that two JOptionPanes are being created. I have checked my code and am confident that I have not explicitly created the JOptionPane twice (the code throughout this question should support this).
Is it possible that two JOptionPanes are being created because of the nature of my code, the fact that there are two JFrames on the screen at once when the JOptionPane is instantiated? I am using the this keyword to specify the parent of the JOptionPanWell, I've checked your code and I've seen where is the error.
In Delface constructor (Delface.java, line 127), you've got this block of code :
1. OkBtn = new JButton("OK");
2. OkBtn.addActionListener(this);
3. bagcon.gridx = 1;
4. bagcon.gridy = 8;
5. gb.setConstraints(OkBtn,bagcon);
6. dcon.add(OkBtn);
7. OkBtn.addActionListener(this);
Have a deep look at lines 2 and 7 : you're registering twice an actionListener on this button. Then you're receiving twice the event and it shows two JOptionPanes. In fact, you've also the problem with the 'ok' option, but you don't see it, because the 'n' variable in your event handler is global to your class, then it's shared between the two calls to the event handlers. -
JDBC Mysql Resultset too large!
Hello everybody,
I'm currently building a large database retrieval system(JAVA and mysql). Everything works fine, but I have a big problem. The returning resultset is way higher then it should be!!
The table has the following structure:
Probe_set_id unsigned mediumint(6)
Expressionvalue float(5,1)
Dataset unsigned tinyint(2)
I'm trying to retrieve a dataset with 6.5 million rows with the following query.
Select Probe_Set_ID, Expressionvalue from Test5 where dataset=1
This results in JAVA taking around 500 megabyte retrieving the Resultset!!! If my calculations are right it should take around the following:
Float 4 bytes * 6500000 = 26000000 bytes
unsigned mediumint = long 8 bytes * 6500000 = 52000000 bytes
That would be 78000000 bytes, which is around 75 megabyte and not 500 megabyte!!!!!
Code sample:
String dataBaseName = "testDB";
String dataBaseUser = "java";
String dataBasePass = "clustering";
String url = "jdbc:mysql://localhost/" + dataBaseName;
Class.forName ("org.gjt.mm.mysql.Driver").newInstance ();
Connection conn = DriverManager.getConnection (url, dataBaseUser, dataBasePass);
conn.setReadOnly(true);
Statement s = conn.createStatement();
s.execute("Select Probe_Set_ID, Expressionvalue from Test5 where dataset=1");
ResultSet rs = s.getResultSet();
This results in a giant resultset and I can't see the answer. I hope someone can help me. I'm using the newest JDBC driver of mysql!Yes the JAVA application really takes up this amount! It is really akward. The DB doesn't take a real big amount of memory because of the buffer sizes I've set. I execute the java application as follow:
./java -server -XX:MaxHeapFreeRatio=5 -XX:MinHeapFreeRatio=20 -Xmx1512M dbTest
I'm really trying to keep the heap small because the JAVA application ( a gene expression processing application/server) takes big amounts of memmory when downloading data from the mysql database and the server is accesible by multiple users parallel. Though I'm still testing alone, so the memmory abuse is not a cause by other users. -
Mapping Java Types to XML Types
Hi, I have a small doubt in web services,
1) how a java data type can match with xml data type in wsdl,
2) how and where the java program can find the matching java
data type to xml data type and vice versa
3) whether any mechanism is available for this data conversion?
4) where can i find that one?
Please advice me
Regards
Marimuthu.NHi Marimuthu.N,
My answers for your question, Kindly let me know if you need some more inputs.
+1) how a java data type can match with xml data type in wsdl,+
In SOAP 1.1 you have the following data types which is in XSD(XML Schema Definition), the same data type is also available in Java. For example (string, normalizedstring in xml is available as java.lang.String)
The complete list can be found in the table below.
XSD to Java Mapping.
XSD Type--------------------------------Java Type
base64Binary----------------------------byte[]
hexBinary---------------------------------byte[]
boolean------------------------------------Boolean
byte-----------------------------------------Byte
dateTime----------------------------------java.util.Calendar
date-----------------------------------------java.util.Calendar
time-----------------------------------------java.util.Calendar
decimal------------------------------------java.math.BigDecimal
double-------------------------------------Double
float-----------------------------------------Float
hexBinary---------------------------------byte[]
int--------------------------------------------Int
unsignedShort---------------------------Int
integer--------------------------------------java.math.BigInteger
long------------------------------------------Long
unsignedInt-------------------------------Long
QName-------------------------------------javax.xml.namespace.QName
short----------------------------------------Short
unsignedByte---------------------------Short
string---------------------------------------java.lang.String
anySimpleType-------------------------java.lang.String
+2) how and where the java program can find the matching java+
data type to xml data type and vice versa
Here is my WSDL which has a method getHello --> Pass Input as String --> Get Response as String.
<?xml version="1.0" encoding="UTF-8"?>
<wsdl:definitions targetNamespace="http://zackria.googlepages.com" xmlns:apachesoap="http://xml.apache.org/xml-soap" xmlns:impl="http://zackria.googlepages.com" xmlns:intf="http://zackria.googlepages.com" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:wsdlsoap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<!--WSDL created by Apache Axis version: 1.4
Built on Apr 22, 2006 (06:55:48 PDT)-->
<wsdl:types>
<schema elementFormDefault="qualified" targetNamespace="http://zackria.googlepages.com" xmlns="http://www.w3.org/2001/XMLSchema">
<element name="getHello">
<complexType>
<sequence>
<element name="s" type="xsd:string"/>
</sequence>
</complexType>
</element>
<element name="getHelloResponse">
<complexType>
<sequence>
<element name="getHelloReturn" type="xsd:string"/>
</sequence>
</complexType>
</element>
</schema>
</wsdl:types>
<wsdl:message name="getHelloResponse">
<wsdl:part element="impl:getHelloResponse" name="parameters"/>
</wsdl:message>
<wsdl:message name="getHelloRequest">
<wsdl:part element="impl:getHello" name="parameters"/>
</wsdl:message>
<wsdl:portType name="Test">
<wsdl:operation name="getHello">
<wsdl:input message="impl:getHelloRequest" name="getHelloRequest"/>
<wsdl:output message="impl:getHelloResponse" name="getHelloResponse"/>
</wsdl:operation>
</wsdl:portType>
<wsdl:binding name="TestSoapBinding" type="impl:Test">
<wsdlsoap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
<wsdl:operation name="getHello">
<wsdlsoap:operation soapAction=""/>
<wsdl:input name="getHelloRequest">
<wsdlsoap:body use="literal"/>
</wsdl:input>
<wsdl:output name="getHelloResponse">
<wsdlsoap:body use="literal"/>
</wsdl:output>
</wsdl:operation>
</wsdl:binding>
<wsdl:service name="TestService">
<wsdl:port binding="impl:TestSoapBinding" name="Test">
<wsdlsoap:address location="http://localhost:8080/TestWebService/services/Test"/>
</wsdl:port>
</wsdl:service>
</wsdl:definitions>I use apache axis for the client side code. I also suggest to start using this to get quickly into SOA(Service Oriented Architecture)
package com.googlepages.zackria;
import org.apache.axis.client.Call;
import org.apache.axis.client.Service;
import javax.xml.namespace.QName;
* TestClient for Webservice
* @author $author$Mohammed Zackria
* @version $Revision$1.00
public class TestClient {
* main method
* @param args pass nothing as far now
public static void main(String[] args) {
try {
String endpoint = "http://localhost:8080/TestWebService/services/Test";
Service service = new Service();
Call call = (Call) service.createCall();
call.setTargetEndpointAddress(new java.net.URL(endpoint));
call.setOperationName(new QName("http://zackria.googlepages.com", "getHello"));
//String Conversion
String ret = (String) call.invoke(new Object[] { "Zack" });
System.out.println("Sent 'Zack', got '" + ret + "'");
} catch (Exception e) {
System.err.println(e.toString());
}+3) whether any mechanism is available for this data conversion?+
Check the above code which has the following portion
//String Conversion
String ret = (String) call.invoke(new Object[] { "Zack" });
By default APACHE Axis returns Object Array which can be Casted to your WSDL defined data type.
+4) where can i find that one?+
[Eclipse Webservice|http://www.eclipse.org/webtools/jst/components/ws/1.5/tutorials/BottomUpWebService/BottomUpWebService.html]
Hope this helps out, Kindly Let me know if you need some more or if i have not answered your question.
Regards,
Zack
Edited by: zack on Nov 22, 2008 1:47 PM
Edited by: zack on Nov 22, 2008 1:49 PM -
How to use MapDepthPointToCameraSpace
This is a public-service post. There was so little documentation available about MapDepthPointToCameraSpace -- and no code examples available at all, in the SDK Browser or elsewhere -- that I was compelled to reverse-engineer the method, just to figure out
how to use it, and here is what I discovered.
Here is the syntax of the method:
public CameraSpacePoint MapDepthPointToCameraSpace (
DepthSpacePoint depthPoint,
UInt16 depth
The critical thing to understand about this method, and the source of much boondoggling until I figured it out, is that the input is in
millimeters, while the output is in
meters.
Uint16 depth -> This is a depth value, unsigned integer (two bytes wide), in units of
millimeters.
DepthSpacePoint depthPoint -> This is a struct containing an [x,y] coordinate. The [x,y] describe a 2D coordinate location on the incoming depth-map from the Kinect, with [0,0] at upper-left corner. This struct contains two properties,
X and Y, which are signed floats (four bytes wide); however, you should assign only positive integers to these X and Y properties. There is no constructor for this struct, so you must create a DepthSpacePoint in several steps, shown in the code example below.
CameraSpacePoint -> This is a struct containing an [x,y,z] coordinate. The [x,y,z] describe a 3D coordinate location in the reference space established by the Kinect sensor itself. This struct contains three properties, X and Y and Z,
which are signed floats (four bytes wide), representing coordinates in physical space, in units of
meters. Although z will always be positive (a zero value indicates an unknown depth value or error), each of x and y may be positive, zero, or negative. If MapDepthPointToCameraSpace cannot complete its calculation
successfully -- for example, an object is too close to the sensor -- then any of the [x,y,z] values may be set to +Infinity or to -Infinity. Attempting to use these infinite values will not throw an exception -- instead, you'll find your variables being
set to MAXINT or -MAXINT and you will be completely confused by the end results. So you must carefully screen for infinite values when using MapDepthPointToCameraSpace.
Example usage:
CoordinateMapper m = myKinectSensor.CoordinateMapper;DepthSpacePoint d = new DepthSpacePoint(); // no constructor is availabled.X = 100; // in pixelsd.Y = 200; // in pixelsCameraSpacePoint p = m.MapDepthPointToCameraSpace( d, // in pixels 2500); // in millimeters
The above code queries the coordinate mapper for pixel-coordinate [x,y] = [100,200] in the Kinect depth map, with input depth value of 2500
millimeters. The output is as follows:
p.X, p.Y, and p.Z contain the mapped 3D coordinate in the Kinect's reference spatial system, in floating-point
meters, where:
X and Y will be positive, zero, or negative if calculation succeeds. They will be plus or minus infinity if a calculation error occurs.
Z will be positive if the calculation succeeds. It will be zero or plus or minus infinity if a calculation error occurs.
I hope that this information is helpful to others!
- ZMKThis is a public-service post. There was so little documentation available about MapDepthPointToCameraSpace -- and no code examples available at all, in the SDK Browser or elsewhere -- that I was compelled to reverse-engineer the method, just to figure out
how to use it, and here is what I discovered.
Here is the syntax of the method:
public CameraSpacePoint MapDepthPointToCameraSpace (
DepthSpacePoint depthPoint,
UInt16 depth
The critical thing to understand about this method, and the source of much boondoggling until I figured it out, is that the input is in
millimeters, while the output is in
meters.
Uint16 depth -> This is a depth value, unsigned integer (two bytes wide), in units of
millimeters.
DepthSpacePoint depthPoint -> This is a struct containing an [x,y] coordinate. The [x,y] describe a 2D coordinate location on the incoming depth-map from the Kinect, with [0,0] at upper-left corner. This struct contains two properties,
X and Y, which are signed floats (four bytes wide); however, you should assign only positive integers to these X and Y properties. There is no constructor for this struct, so you must create a DepthSpacePoint in several steps, shown in the code example below.
CameraSpacePoint -> This is a struct containing an [x,y,z] coordinate. The [x,y,z] describe a 3D coordinate location in the reference space established by the Kinect sensor itself. This struct contains three properties, X and Y and Z,
which are signed floats (four bytes wide), representing coordinates in physical space, in units of
meters. Although z will always be positive (a zero value indicates an unknown depth value or error), each of x and y may be positive, zero, or negative. If MapDepthPointToCameraSpace cannot complete its calculation
successfully -- for example, an object is too close to the sensor -- then any of the [x,y,z] values may be set to +Infinity or to -Infinity. Attempting to use these infinite values will not throw an exception -- instead, you'll find your variables being
set to MAXINT or -MAXINT and you will be completely confused by the end results. So you must carefully screen for infinite values when using MapDepthPointToCameraSpace.
Example usage:
CoordinateMapper m = myKinectSensor.CoordinateMapper;DepthSpacePoint d = new DepthSpacePoint(); // no constructor is availabled.X = 100; // in pixelsd.Y = 200; // in pixelsCameraSpacePoint p = m.MapDepthPointToCameraSpace( d, // in pixels 2500); // in millimeters
The above code queries the coordinate mapper for pixel-coordinate [x,y] = [100,200] in the Kinect depth map, with input depth value of 2500
millimeters. The output is as follows:
p.X, p.Y, and p.Z contain the mapped 3D coordinate in the Kinect's reference spatial system, in floating-point
meters, where:
X and Y will be positive, zero, or negative if calculation succeeds. They will be plus or minus infinity if a calculation error occurs.
Z will be positive if the calculation succeeds. It will be zero or plus or minus infinity if a calculation error occurs.
I hope that this information is helpful to others!
- ZMK -
TCP communications via C program with VI on a PC (SGI - Windows)
I have a pair of simple (more at prototype) client/server C programs on an
SGI host. On the SGI, they compile and run fine (using separate windows).
I know what the server is supposed to be sending (C floats) and the client
is reading the correct values.
I now want to start my C program server on the SGI host, and use the Simple
Data Client.vi (in LabVIEW 6.1's examples) to display (in its graph) the
floating point values that the SGI host is sending.
So far, I have not had complete success. If I start my SGI server, and
"point" the example Simple Data Client VI at my server, the LabVIEW client
gets immediate errors (overflows).
As an experiment, I tried going the other way. That it, I started up
the
Simple Data Server VI on the Windows PC. I then "pointed" my SGI client at
the server on the PC. It works, ... sort of. I am getting an
appropriately sized list of numbers displayed on the SGI host, but while
most look like floating point values, some look like VERY large integers.
I believe I have a data representation problem. That is, I don't know if I
should expect to send (server-side) or see (client-side) C programming
variables of type 4-byte floats, 8 byte doubles, or something else. Also, I
am not certain how many values I should expect to send/see in each message.
I think the default for the Simple Data Client/Server programs is 200
points, but I am not sure what that really means, either.
Any suggestions would be very much appreciated.
Mike McCormick
Michael J. McCormick
Phone: 520-545-7972
Fax: 520-794-9400
Email: [email protected]> As an experiment, I tried going the other way. That it, I started up the
> Simple Data Server VI on the Windows PC. I then "pointed" my SGI client at
> the server on the PC. It works, ... sort of. I am getting an
> appropriately sized list of numbers displayed on the SGI host, but while
> most look like floating point values, some look like VERY large integers.
>
> I believe I have a data representation problem. That is, I don't know if I
> should expect to send (server-side) or see (client-side) C programming
> variables of type 4-byte floats, 8 byte doubles, or something else. Also, I
> am not certain how many values I should expect to send/see in each message.
> I think the default for the Simple Data Client/Server programs is 200
> points
, but I am not sure what that really means, either.
>
By default, LV converts all of the datatypes to be in big endian form.
I'm not sure about your SGI, but if it is a little endian machine, then
that will cause problems. If that is the case, you will want to swap
the words and bytes of the four byte values.
To debug this more easily, you might just make sure you send over very
predictable data such as 0, 1, 2, 3, etc. Lots of times these are
tested with random data, but that makes it pretty hard to see a pattern
when the data is wrong.
Greg McKaskle -
One of my friends sent me this e-mail. Can anyone help??
ok wood, here's one for you:
the software i'm writing get's data from one of two processors on a
satelite. these processors use different #'s of bytes for their
primitive types.
bool - 1 byte
short - 2 bytes
int - 2 bytes
long - 4 bytes
float - 4 bytes.
so..as you know the jvm uses 4 bytes for an int, 8 for a long. I
want to be able to have people who are developing sims ontop of my
framework be able to use a primitiave type, such as an int, and have
it only be 2 bytes...now i'm pretty sure this isn't possible. You
can't overload a primitive type in java right? I have some ideas
here on what to do (create whole new objects, holding byte arrays and
use java.nio to manaage them), but it just seems like such a hastel.
i guess i was wondering if you have ever seen this kindof thing
before and if you had any advice. thanks man.In C, primitive types can vary in size, based on the platform being used. In Java, the size of primitives is static. If he wants 16-bit storage, short is the way to go. Well, a char is a couple of bytes, too, but it's unsigned, intended for Unicode characters, and probably not what he's looking for anyway...
:o) -
Hi,forgive for all the code but i've asked this question before and people asked for more code.The problem is i get an error in publicationmain saying "undefined varible newpublication" so how do i fix this?and is my edit method goin to work?using the get and set method?can u show me how do do this please?feel free to make any other changes.thanxs a reply would be most heplful
public class publication
public int PublicationID;
public String publicationname;
public String publisher;
public String PricePerIssue;
public String pubstatus;
public String publicationtype;
public publication(int NewPublicationID, String Newpublicationname, String Newpublisher, String NewPricePerIssue, String Newpubstatus, String Newpublicationtype)
PublicationID = NewPublicationID;
publicationname = Newpublicationname;
publisher = Newpublisher;
PricePerIssue = NewPricePerIssue;
pubstatus = Newpubstatus;
publicationtype = Newpublicationtype;
public String toString ()
String pubreport = "---------------------------Publication-Information-----------------------------";
pubreport += "Publication ID:" PublicationID"/n";
pubreport += " Publication Title:" publicationname"/n";
pubreport += " publisher: " publisher"/n";
pubreport += " price Per Issue: " PricePerIssue"/n";
pubreport += " publication Status: " pubstatus"/n";
pubreport += " publication Type: " publicationtype"/n";
return pubreport;
public void SetPublicationID(int PubID)
PublicationID = PubID;
public int GetPublicationID()
return PublicationID;
public void Setpublicationname(String pubname)
publicationname = pubname;
public String Getpublicationname()
return publicationname;
public void Setpublisher(String Pub)
publisher = Pub;
public String Getpublisher()
return publisher;
public void SetPricePerIssue(String PPI)
PricePerIssue = PPI;
public String GetPricePerIssue()
return PricePerIssue;
public void Setpubstatus(String Status)
pubstatus = Status;
public String Getpubstatus()
return pubstatus;
public void Setpublicationtype(String Pubtype)
publicationtype = Pubtype;
public String Getpublicationtype()
return publicationtype;
import java.util.*;
import publication;
public class PublicationContainer
LinkedList PubList;
public PublicationContainer()
PubList = new LinkedList();
public int add (publication newpublication)
PubList.addLast(newpublication);
return PubList.size();
private class PubNode
public publication pubrecord;
public PubNode next;
public PubNode (publication thepublicationrecord)
publication p = thepublicationrecord;
next = null;
public String toString()
return PubList.toString();
public void remove(int PubID)
PubList.remove(PubID);
public publication get(int PubID)
return (publication)PubList.get(PubID);
public void set(int PubID,publication newpublication)
PubList.set(PubID, newpublication);
import cs1.Keyboard;
import publication;
import java.util.*;
public class publicationmain
public static void main(String args[])
PublicationContainer pubdatabase = new PublicationContainer();
int userchoice;
boolean flag = false;
while (flag == false)
System.out.println("------------------------------------Publications--------------------------------");
System.out.println();
System.out.println("please Make a Selection");
System.out.println();
System.out.println("1 to add publication");
System.out.println("2 to delete publication");
System.out.println("0 to quit");
System.out.println("3 to View all publications");
System.out.println("4 to Edit a publication");
System.out.println("5 to select view of publication");
System.out.println("6 to produce daily summary");
System.out.println();
userchoice = Keyboard.readInt();
switch (userchoice)
case 1:
String PubName;
String PricePerIssue;
String Publisher;
String Pubstatus;
String Pubtype;
int PubID;
System.out.println ("Enter Publication ID:");
PubID = Keyboard.readInt();
System.out.println("Enter Publication Name:");
PubName = Keyboard.readString();
System.out.println("Enter Publisher Name");
Publisher = Keyboard.readString();
System.out.println("Enter Price per Issue:");
PricePerIssue = Keyboard.readString();
System.out.println("Enter Publication status");
Pubstatus = Keyboard.readString();
System.out.println("Enter Publication type:");
Pubtype = Keyboard.readString();
pubdatabase.add (new publication(PubID, PubName, Publisher, PricePerIssue, Pubstatus, Pubtype));
break;
case 0:
flag = true;
case 2:
System.out.println ("Enter Publication ID:");
PubID = Keyboard.readInt();
pubdatabase.remove (PubID);
System.out.println ("publication: "+(PubID)+" removed");
System.out.println();
break;
case 3:
System.out.println (pubdatabase);
break;
case 4:
System.out.println ("Enter Publication to be edited by Publication ID: ");
PubID = Keyboard.readInt();
pubdatabase.get(PubID);
pubdatabase.set(PubID, newpublication);
default:
System.out.println("Incorrect Entry");
}Whoops! Anyone spot the mistake?
I (blush) forgot to re-instate the serial key for the publications after reading them in from disk.
Works now ;)
import javax.swing.JComponent;
import javax.swing.JList;
import javax.swing.DefaultListModel;
import javax.swing.JPanel;
import javax.swing.JOptionPane;
import javax.swing.JButton;
import javax.swing.JScrollPane;
import javax.swing.JLabel;
import javax.swing.JComboBox;
import javax.swing.JTextField;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.Dimension;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.Serializable;
class Publication
implements Serializable
private static final String sFileName= "Publications.ser";
public static final byte UNKNOWN= 0;
public static final byte HARDBACK= 1;
public static final byte PAPERBACK= 2;
public static final byte AUDIO= 3;
public static final byte BRAIL= 4;
public static final byte LARGE_PRINT= 5;
public static final byte INSTOCK= 1;
public static final byte BACK_ORDER= 2;
public static final byte OUT_OF_PRINT= 3;
private static final String[] sTypeNames=
{ "Unknown", "Hardback", "Paperback", "Audio", "Brail", "Large Print" };
private static final String[] sStatusNames=
{ "Unknown", "In Stock", "Back Order", "Out of Print" };
private int mId;
private String mTitle;
private String mAuthor;
private String mPublisher;
private float mPrice;
private byte mStatus;
private byte mType;
private static Object sIdLock= new Object();
static int sId;
public Publication(
String title, String author, String publisher,
float price, byte status, byte type)
setTitle(title);
setPublisher(publisher);
setAuthor(author);
setPrice(price);
setStatus(status);
setType(type);
synchronized (sIdLock) {
mId= ++sId;
public int getId() { return mId; }
public void setTitle(String title) { mTitle= title; }
public String getTitle() { return mTitle; }
public void setAuthor(String author) { mAuthor= author; }
public String getAuthor() { return mAuthor; }
public void setPublisher(String publisher) { mPublisher= publisher; }
public String getPublisher() { return mPublisher; }
public void setPrice(float price) { mPrice= price; }
public float getPrice() { return mPrice; }
public void setStatus(byte status)
if (status >= INSTOCK && status <= OUT_OF_PRINT)
mStatus= status;
else
mStatus= UNKNOWN;
public byte getStatus() { return mStatus; }
public String getStatusName() { return sStatusNames[mStatus]; }
public void setType(byte type)
if (type >= HARDBACK && type <= LARGE_PRINT)
mType= type;
else
mType= UNKNOWN;
public byte getType() { return mType; }
public String getTypeName() { return sTypeNames[mType]; }
public String toString ()
return
" id= " +getId() +
", title= " +getTitle() +
", author= " +getAuthor() +
", publisher= " +getPublisher() +
", price= " +getPrice() +
", status= " +getStatus() +
" (" +getStatusName() +")" +
", type= " +getType() +
" (" +getTypeName() +")";
private static void addPublication(DefaultListModel listModel) {
editPublication(listModel, null);
private static void editPublication(
DefaultListModel listModel, Publication publication)
JPanel panel= new JPanel(new BorderLayout());
JPanel titlePanel= new JPanel(new GridLayout(0,1));
JPanel fieldPanel= new JPanel(new GridLayout(0,1));
JTextField fTitle= new JTextField(20);
JTextField fAuthor= new JTextField();
JTextField fPublisher= new JTextField();
JTextField fPrice= new JTextField();
JComboBox cbStatus= new JComboBox(sStatusNames);
JComboBox cbType= new JComboBox(sTypeNames);
fieldPanel.add(fTitle);
fieldPanel.add(fAuthor);
fieldPanel.add(fPublisher);
fieldPanel.add(fPrice);
fieldPanel.add(cbStatus);
fieldPanel.add(cbType);
titlePanel.add(new JLabel("Title:"));
titlePanel.add(new JLabel("Author:"));
titlePanel.add(new JLabel("Publisher: "));
titlePanel.add(new JLabel("Price:"));
titlePanel.add(new JLabel("Status:"));
titlePanel.add(new JLabel("Type:"));
panel.add(titlePanel, BorderLayout.WEST);
panel.add(fieldPanel, BorderLayout.EAST);
if (publication != null) {
fTitle.setText(publication.getTitle());
fTitle.setEditable(false);
fAuthor.setText(publication.getAuthor());
fPublisher.setText(publication.getPublisher());
fPrice.setText("" +publication.getPrice());
cbStatus.setSelectedIndex((int) publication.getStatus());
cbType.setSelectedIndex((int) publication.getType());
int option= JOptionPane.showOptionDialog(
null, panel, "New Publication",
JOptionPane.OK_CANCEL_OPTION,
JOptionPane.PLAIN_MESSAGE,
null, null, null
if (option != JOptionPane.OK_OPTION)
return;
String title=
fTitle.getText().length() < 1 ? "Unknown" : fTitle.getText();
String author=
fAuthor.getText().length() < 1 ? "Unknown" : fAuthor.getText();
String publisher=
fPublisher.getText().length() < 1 ? "Unknown" : fPublisher.getText();
float price= 0.0f;
try { price= Float.parseFloat(fPrice.getText()); }
catch (NumberFormatException nfe) { }
byte status= (byte) cbStatus.getSelectedIndex();
byte type= (byte) cbType.getSelectedIndex();
if (publication != null) {
publication.setAuthor(author);
publication.setPublisher(publisher);
publication.setPrice(price);
publication.setStatus(status);
publication.setType(type);
else {
listModel.addElement(
new Publication(title, author, publisher, price, status, type));
private static void deletePublications(JList list, DefaultListModel listModel)
if (list.getSelectedIndex() >= 0) {
Object[] values= list.getSelectedValues();
for (int i= 0; i< values.length; i++)
listModel.removeElement(values);
private static DefaultListModel getListModel()
DefaultListModel listModel;
try {
ObjectInputStream is=
new ObjectInputStream(new FileInputStream(sFileName));
listModel= (DefaultListModel) is.readObject();
is.close();
if (listModel.getSize() > 0) {
Publication.sId=
((Publication)
listModel.get(listModel.getSize() -1)).getId();
catch (Exception e) {
JOptionPane.showMessageDialog(
null, "Could not find saved Publications, creating new list.",
"Error", JOptionPane.ERROR_MESSAGE);
listModel= new DefaultListModel();
// add a known book to the list (I'm pretty sure this one exists ;)
listModel.addElement(
new Publication("The Bible", "Various", "God", 12.95f,
Publication.INSTOCK, Publication.HARDBACK));
// add a shutdown hook to save the list model to disk when we exit
final DefaultListModel model= listModel;
Runtime.getRuntime().addShutdownHook(new Thread() {
public void run() {
saveListModel(model);
return listModel;
private static void saveListModel(DefaultListModel listModel)
try {
ObjectOutputStream os=
new ObjectOutputStream(new FileOutputStream(sFileName));
os.writeObject(listModel);
os.close();
catch (IOException ioe) {
System.err.println("Failed to save Publications!");
ioe.printStackTrace();
public static void main(String args[])
// store all the publications in a list model which drives the JList
// the user will see - we save it on exit, so see if there's one on disk.
final DefaultListModel listModel= getListModel();
final JList list= new JList(listModel);
// two panels, the main one for the dialog and one for buttons
JPanel panel= new JPanel(new BorderLayout());
JPanel btnPanel= new JPanel(new GridLayout(1,0));
// an add button, when pressed brings up a dialog where the user can
// enter details of a new publication
JButton btnAdd= new JButton("Add");
btnAdd.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
addPublication(listModel);
btnPanel.add(btnAdd);
// a delete button, when pressed it will delete all the selected list
// items (if any) and then disable itself
final JButton btnDelete= new JButton("Delete");
btnDelete.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
deletePublications(list, listModel);
btnDelete.setEnabled(false);
btnPanel.add(btnDelete);
// hook into the list selection model so we can de-activate the delete
// button if no list items are selected.
list.getSelectionModel().addListSelectionListener(
new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
if (list.getSelectedIndices().length > 0)
btnDelete.setEnabled(true);
else
btnDelete.setEnabled(false);
// Watch out for double clicks in the list and edit the document
// selected
list.addMouseListener(new MouseListener() {
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 2) {
editPublication(
listModel, (Publication) list.getSelectedValue());
public void mousePressed(MouseEvent e) { }
public void mouseReleased(MouseEvent e) { }
public void mouseEntered(MouseEvent e) { }
public void mouseExited(MouseEvent e) { }
// Now keep an eye out for the user hitting return (will edit the selected
// publication) or delete (will delete it)
// Note: we have do the ugly "pressed" flag because JOptionPane closes
// on keyPressed and we end up getting keyReleased. Can't use keyTypes
// because it does not contain the virtual key code 8(
list.addKeyListener(new KeyListener() {
boolean pressed= false;
public void keyTyped(KeyEvent e) { }
public void keyPressed(KeyEvent e) {
pressed= true;
public void keyReleased(KeyEvent e) {
if (pressed && e.getKeyCode() == e.VK_ENTER) {
editPublication(
listModel, (Publication) list.getSelectedValue());
else if (pressed && e.getKeyCode() == e.VK_DELETE)
deletePublications(list, listModel);
pressed= false;
// Put the list in a scroll pane so we can see it all. Make it resonably
// wide so we don't have top scroll horizonatly to see most publications
JScrollPane listScrollPane= new JScrollPane(list);
listScrollPane.setPreferredSize(new Dimension(640, 300));
// layout the list and button panel
panel.add(listScrollPane, BorderLayout.CENTER);
panel.add(btnPanel, BorderLayout.SOUTH);
// ok, ready to rumble, lets show the user what we've got
JOptionPane.showOptionDialog(
null, panel, "Publications",
JOptionPane.DEFAULT_OPTION,
JOptionPane.PLAIN_MESSAGE,
null, new String[0], null
// leg it
System.exit(0);
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