java-programmer >>how does picking and intersection works ?

how does picking and intersection works ?

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- 2
  - Embedded underscoresI noticed Ruby has a convention I wish Java would implement. I think
    it could be done without breaking existing code.
    
    You simply permit the _ character to appear embedded in numeric
    literals in Java source code. The lead _ would not be permitted, so
    you still have no trouble telling a number apart from an identifier.
    
    Then you might write a numeric literal like this:
    
    2006_12_31
    or
    123_456_679
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    0x1234_5678
    or
    250_361_9093
    or
    1000_99
    
    The _ is simply ignored. You use it to break the number up in
    whatever way you choose to make it more readable.
    
    --
    Canadian Mind Products, Roedy Green.
    http://mindprod.com Java custom programming, consulting and coaching.
- 3
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    I am developing chess game written as an JavaApplet.
    Using Borland JBuilder 9 Personal Edition.
    I use the following Code
    void this_mouseDragged(MouseEvent e)
    {
    }
    class Chess_this_mouseMotionAdapter extends
    java.awt.event.MouseMotionAdapter
    {
    Chess adaptee ;
    Chess_this_mouseMotionAdapter ( Chess adaptee )
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    this.adaptee = adaptee ;
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    }
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    But it seems that it still fire when the mouse button is released.
    The Applet are on the following URL
    http://w1.201.telia.com/~u20100003/Chess.html
    
    Verry Thankfull for Tips or Advice.
    Sincerely
    Urban Avierfj?
    Gotland, Sweden
- 3
  - Global Servlet FilterI'm writing a servlet filter that will keep track of the number of hits
    for my site but the site is composed of several web applications. I'd
    like to write it in such a way as to allow it to work with all of the
    applications at one time, instead of tallying individual counts by hand.
    
    Any pointers or suggestions are appreciated.
    
    Thanks,
    -Makr
- 3
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    not the case?
    
    Any ideas on what I could be doing wrong? Thank you.
    
    --------------code
    snippet----------------------------------------------------------
    
    package com.pch.webapp;
    
    import java.applet.Applet;
    
    import java.awt.BorderLayout;
    import java.awt.Dimension;
    import java.awt.Frame;
    import java.awt.Graphics;
    import java.awt.Toolkit;
    
    public class ScrollingMessage extends Applet implements Runnable{
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    private int dx;
    private int dy;
    private boolean isStandalone = false;
    private boolean running;
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    private int y = 25;
    
    public ScrollingMessage(){
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    public static void main( String[] args ){
    
    ScrollingMessage applet = new ScrollingMessage();
    applet.isStandalone = true;
    
    Frame frame;
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    frame.setTitle( "Applet Frame" );
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    applet.start();
    frame.setSize( 400, 320 );
    
    Dimension d = Toolkit.getDefaultToolkit()
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    frame.setVisible( true );
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    // Destroy the applet
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    System.err.println( "destroy" );
    worker = null;
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    // Get Applet information
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    System.err.println( "getAppletInfo" );
    
    return "Applet Information";
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    public int getDx(){
    
    return dx;
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    public int getDy(){
    
    return dy;
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    public String getMessage(){
    
    return message;
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    // Get a parameter value
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    return isStandalone ? System.getProperty( key, def )
    : ( ( getParameter( key ) != null ) ? getParameter( key ) :
    def );
    }
    
    // Get parameter info
    public String[][] getParameterInfo(){
    System.err.println( "getParameterInfo" );
    
    String[][] pinfo = {{"aMessage", "String", ""}
    , };
    
    return pinfo;
    }
    
    public int getX(){
    
    return x;
    }
    
    public int getY(){
    
    return y;
    }
    
    // Initialize the applet
    public void init(){
    System.err.println( "init" );
    try{
    message = this.getParameter( "aMessage", "There's no place like
    127.0.0.1." );
    } catch( Exception e ){
    e.printStackTrace();
    }
    
    try{
    jbInit();
    } catch( Exception e ){
    e.printStackTrace();
    }
    }
    
    public void paint( Graphics g ){
    System.err.println( "painting" );
    g.drawString( this.getMessage(), getX(), getY() );
    }
    
    public void run(){
    while( isRunning() ){
    setX( getX() + 1 );
    setDx( getDx() );
    this.repaint();
    try{
    System.err.println( "\tabout to sleep" );
    worker.sleep( 250 );
    } catch( InterruptedException ex ){
    ex.printStackTrace();
    }
    }
    
    System.err.println( "done" );
    }
    
    public void setDx( int dx ){
    this.dx = dx;
    }
    
    public void setDy( int dy ){
    this.dy = dy;
    }
    
    public void setX( int x ){
    this.x = x;
    }
    
    public void setY( int y ){
    this.y = y;
    }
    
    // Start the applet
    public void start(){
    System.err.println( "start" );
    if( worker == null ){
    worker = new Thread( this );
    }
    
    setRunning( true );
    worker.start();
    }
    
    // Stop the applet
    public void stop(){
    System.err.println( "stop" );
    if( worker != null ){
    setRunning( false );
    }
    }
    
    private boolean isRunning(){
    
    return running;
    }
    
    // Component initialization
    private void jbInit() throws Exception{
    }
    
    private synchronized void setRunning( boolean running ){
    this.running = running;
    }
    
    }
- 5
  - OnLoad kicking off processGood Morning,
    
    A friend of mine asked me a question the other day and I am fairly stumped.
    Is there a way to use the onLoad function to kick off a process on the
    server while the page is being painted? Want to send a message to a servlet
    and then send the form to the servlet once the user has filled in the
    values.
    
    I did some webapp stuff a while back and we used the onload function to help
    the page paint a little easier, I wondered if we could use it to send a
    message, or if there was something in JSP or HTML that I overlooked.
    
    Thanks,
    M@
- 6
  - JSTL concatenateWell.. i wanna to concatenate a string... like:
    
    String x;
    
    while(true)
    x += "x";
    
    Then i get xxxxxxxxxxxxxxxxxxxx :)
    
    How do i do that on JSTL?
    
    Here is my code...
    
    <c:set var="valorColuna" value="${rowValues.value}"/>
    
    <c:forEach var="pk" items="${datagrid.primaryKeys}">
    <c:set var="pkActual" value="${pk.columnName}"/>
    <c:if test="${colunaActual == pkActual}">
    <c:set var="pkValor" value="${valorColuna}{$valorColuna}"/>
    
    I have tried without operators but it does not work. JSTL functions
    also seem not to help (no concat function!)...
    
    Any sugestions?
    
    Thanks,
    
    JF
- 6
  - looking for an open source java charting libraryHi All,
    I am evaluating open source java charting libraries for use
    in one of my projects. I would need both browser based
    and applet based implementation.
    JFreeCharts seems to fit the bill.
    http://jfree.org
    Can the community help me identify if there is any better
    java charting library out there?
    
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- 10
  - Set the icon of JButtonHello.
    
    How can I set the icon of JButton ?
    
    Thanks :)
- 12
  - Earth to Sun: When will Java support closures now?Vitaly Lugovsky <email***@***.com> writes:
    
    > No. It was added to make source files more readable.
    
    How can something be more readable when anything in effect can be
    replaced by a macro? You are perhaps focusing on #include and the
    like; but the following is bad:
    
    /* In some header file included somewhere while resolving
    a source file */
    #define foo fie
    
    /* In the source file - will end up as fie()*/
    int foo() {
    }
    
    To quote Wikipedia: "The use of preprocessors has been getting less
    common as recent languages provide more abstract features rather than
    lexical-oriented ones. Indeed, the overuse of the proprecessor might
    yield quite chaotic code. In designing a new language based on C,
    Stroustrup introduced features such as inline and templates into C++
    in an attempt to make the C preprocessor less relevant."
    
    > > Yes, again because they avoid strong typing.
    >
    > How?
    
    Because the template has no idea whether the type parameter actually
    supports the operations used inside it, e.g. a method call. In Java,
    you cannot use an operation on a parametrized type unless you declare
    that yes, this type shall conform to this interface/class.
    
    > C and C++ are not strictly typed.
    
    Not C, but every resource I've seen on C++ claims it is (by default),
    though how strong anything is when it can be cast away as will is a
    different question. Maybe you define "strong/strict typing"
    differently from the makers of C++ and Java?
    
    > No. The reason is that there are too many monkeys around. Not so
    > much humans. Ask yourself - why so much people listens "rap" and
    > other popular crap, much more then good jazz or classics? Would you
    > list this fact as an argument that rap is better? Popularity is a
    > shit. Almost everything that is popular must be a shit.
    
    I am getting the impression "Lisp" is a mis-spelling for "Elitist".
- 12
  - Petstore populate dbHello, why some applications like Petstore populate the db
    when the application start? It's a java demonstration or is a
    usual procedure?
    
    TIA
- 12
  - Apache Derby : create several instances.Hello.
    I am using Apache derby database (Client network).
    I see that when I create table it is created on an instance APP
    (I don't know if instance is the correct word. sorry of my English).
    I see that there are other instances (NULLID, SQLJ, SYS, etc).
    Can I create an instance of my own in derby database, and how can I do that
    ?
    (One instance may be used for repository, another for Datawarehouse, ...)
    
    Another thing :
    If I create several databases for te above reason (repository may be on
    another db), how can I join them, when I am connected to database1, and want
    to run a query that join both tables from database1 and database2 ?
    
    Thanks :)
- 13
  - President ? Vice President 2Barter's Google.org <press@google.com>,http://mail.google.com/mail/?ui=2&ik=fe78bf8dd7&view=lg&msg=119bed0c1fc1f0fa
    Feel free to forward....
    Congressional Quarterly <email***@***.com>,
    2Barter's Google.org <email***@***.com>,
- 13
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    Dior Lovely Bag Beige - Large Handbags At:
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    Lady Dior Bag - White Handbags At: http://www.sales-luxury.org/christian_dior_purses_287.html
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    ......
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    to take a look at our exceptional Marc Jacobs replica bags as well as
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    http://www.sales-luxury.org/
- 13
  - String exceeding length - Getting absolute string lengthHello,
    
    I am having a problem when inputting very long strings into a database.
    The application I am writing can use different databases (thanks to
    the wonders of JDBC) so this issue has been causing problems on both
    Oracle and SQL Server.
    
    Because one of the design objects was to support any JDBC compatible
    database, a concern was raised about text widths. It was therefore
    decided that the maximum column width for a VARCHAR would be a
    configurable value. We theoretically knew that data could be more than
    a single line so we introduced a sequence number to allow multiple
    rows. (Don't ask me why we didn't use CLOBs instead, this is the
    schema I'm stuck with.)
    
    We now need to store base64 data in the same fields. The problem is
    that in an example 4000 characters as defined by the Java string
    object, its physical size is approximently 4430. This seems to be
    because of the amount of mark-up involved, either in the base64 data or
    possibly with the text between.
    
    It occurs to me that while a non-ASCII value many be only a single
    character in a unicode string, it is 6 characters in UTF-8. Therefore
    I'm looking for a way of calculates the absolute length, rather than a
    count of characters.
    
    Is this possible or will I have to change the schema?
- 15
  - Please help me
    "Andrew Thompson" <email***@***.com> wrote in message
    news:email***@***.com...
    > On Wed, 9 Jun 2004 19:16:11 +0100, April wrote:
    > > "Andrew Thompson" <email***@***.com> wrote in message
    > >> On Tue, 8 Jun 2004 16:38:14 +0100, April wrote:
    > >>
    > >>> I have recently got a new pc but for some reason I am unable to get
    java
    > > on
    > >>> it. I have downloaded it several times and it has gone through the
    > > motions
    > >>> but still does not work. This is starting to annoy me as many web
    sites
    > > I go
    > >>> to use java. Any ideas anyone please.
    >
    > > Yes I am running windows XP with internet explorer.
    >
    > Would you consider using a different browser?
    >
    > Before we go to what might be a great deal
    > of effort, I should point out that internet
    > explorer is the single most broken browser
    > available.
    >
    > Installing a browser like Mozilla or Opera,
    > then (if necessary) installing Java almost
    > always goes smoothly on browsers that are *not*
    > IE. Both Opera and Mozilla are also better
    > at rendering valid web-pages, and offer things
    > that IE simply cannot do.
    >
    > >> Do you know how to open the command line,
    > >> also known as DOS?
    >
    > > I am not too sure about
    > > opening the comand line.
    >
    > We will leave that for the moment, though
    > that may be necessary if you really want
    > to coax IE into understanding Java (though
    > I cannot make any guarantees we will get
    > Java working in IE even then)
    >
    > >> <http://www.physci.org/pc/properties.jsp>
    > ...
    > >> Once you download it, double click
    > >> it and report what happens.
    >
    > >..I downloaded jtest but am unable to run it as I
    > > have not got the programe to run it with. It asks me if I want to choose
    a
    > > programe to open it with or look on the internet. I looked on the
    internet
    > > but I am totally lost.
    >
    > I had hoped this was a more limited problem,
    > but that test rules out those hopes..
    >
    > >..You can email me if you would likl to.
    >
    > I answer questions on usenet for free,
    > email help costs money. ;-)
    >
    > For the moment I suggest you try one of
    > the other fine browsers available, see
    > if you can get Java working in it (which
    > will probably be as easy as IE promised,
    > but failed to deliver), and get back to us..
    >
    > --
    > Andrew Thompson
    > http://www.PhySci.org/ Open-source software suite
    > http://www.PhySci.org/codes/ Web & IT Help
    > http://www.1point1C.org/ Science & Technology
    
    Ok I am going to try morzila and hope for no problems but if I do get any
    then I just system restore.

Author

Message

sonu2912

Posted: 2004-9-13 15:54:00

Top

java-programmer, how does picking and intersection works ? hi

I am interested i knowing how does the picking and intersection of shapes.
I am more concerned about picksegment and shape3d intersection. what's the
algorithm used and how effective it is. I am interested in the thoery of
all this than programming.

I am using pick segment to pind the intersection point, I have to find the
distance and than do some maths to find the intersection point, is there
an built-in function for this.

Thanks

sonu

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- 10
  - sound in JavaHi all!
    
    How is possible to change frequency at java's command beep()? Or
    somehow? I need two different beeps in my application. They should be
    only a kind of beeps and not playing MIDI or something similar.
    
    Thanks,
    Branko
- 11
  - What is Delegation, versus inheritence, examples in C or C++"Bernard" <email***@***.com> wrote:
    
    > I apologize if this has been brought up here before.
    > Searching through the newsgroup I found variants of
    > my question, but not exactly what I am thinking about.
    >
    > I am trying to learn UML from a well publicized book,
    > "Instant UML" Wrox press by Pierre-Alain Muller.
    >
    > While I may admire the book for its conciseness, I
    > have difficulty following its examples and explanation
    > of Delegation. He explains Delegation mechanism by
    > a diagram of client communicates with an interface that
    > propagates questions to one or more delegates. It is
    > not clear but is on page 53. Next page he has some
    > discussion of the "covariance problem" which he discusses
    > earlier but never defines, leaving a vague understanding.
    > On p54, he also has example of how inheritence is simulated
    > by hand using delegation and talks of X-windows which is
    > written "entirely in C". There is no example. Where
    > ever I was able to understand his discussion, it was
    > due to prior knowledge of the field. If some kind
    > soul has been able to follow this book and can give
    > explanations with reference to page numbers that would
    > be very nice.
    >
    > Thanks++,
    
    I looked for your concept of "Delegation" in the only book that I have
    on UML. This is by Craig Larman. Its index does not evennnnn list it.
    
    You should expand your query to other language groups. I can do it
    for you. OOP implementation questions have been asked there before
    
    Monica
- 12
  - JFileChooser, defaulting Detail View on startupIn JFileChooser, how do I default the view into Detail View when I
    start my GUI?
    
    Thanks
    Thierry
- 13
  - Junit: overriding original class private methodsI have a class that when run will call a private sendEfvent() method
    that sends data to an external process. I would like to override that
    behavior in testing and just report what is set to avoid the
    complications, etc of having to use external processes during unit
    testing.
    
    I don't think I can just use an assertTrue() because I also want to
    know how many times this private method is called (i.e. is it sending
    the correct number of copies out)?
    
    Is there a way I can cause Junit to stop the JRE from calling the true
    sendEvent() method and instead call something in my test class??
    
    -Robert
- 14
  - Handling of DST in javaStefan Ram wrote:
    > Raymond DeCampo <email***@***.com> writes:
    >
    >>Perhaps, but that is not something the government can easily
    >>legislate nor enforce. (Do you really want the time police
    >>checking to see if you are working an hour later?)
    >
    >
    > Something like this is done here for the closing-time of
    > stores. So, since the government already enforces
    > opening-times and closing-times of stores, they could change
    > these and they could change to times for schools, universities
    > and their own agencies. Some other institutions then might
    > follow.
    >
    
    By "here", I assume you mean Germany, based on what you wrote below.
    There are no such laws in the US with the exception of some states that
    have "blue laws" that only apply on Sundays.
    
    Your suggestion sounds like a nightmare where you never know what is
    going to be available when.
    
    >
    >>There is nothing sacred about the time zone.
    >
    >
    > It is only that, given two time stamps of the legal time for
    > a location in Germany, like
    >
    > 2005-07-10T21:38:10 and
    > 1960-07-10T21:38:13
    >
    > it would be a typical programming task to write a routine
    > that can calculate the difference between them in seconds.
    > And this would be much more easy, without the need to have
    > to find out all details of regulations for DST in Germany.
    >
    > After WWII, in Germany, there were several different zones
    > controlled by different countries and some details for the DST
    > differed between these zones. In one zone, there was a special
    > DST with two hours added for the mid of summer. Then there are
    > reports that there were years with DST even in winter. And so
    > on.
    >
    > All these special regulations make it very difficult to
    > write such a routine.
    >
    
    This is why any environment worth its salt has these routines available
    in a standard library. Asking people to forgo a substantial reduction
    in energy use for the (supposed) convenience of computer programmers is
    ridiculous. Remember that computers are not an end unto themselves,
    they are tools here to serve.
    
    Ray
    --
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- 15
  - Will MS be less evil now?I don't understand Gates. If he wants to do good deeds and be a
    philanthropist, why limit such good deeds to healthcare and
    education? Why not also do a good deed in the computer
    industry? In this industry he is known less for his innovations
    than for tactics such as sabotaging Java and cutting off
    Netscape's air supply. He has done the industry and consumers
    immeasurable harm, for example, by freezing the development
    of web browsers. Here's an idea for Gates: Unfreeze the web
    browser. Take web browsing to the next level. Start by
    implementing SVG, the W3 standard for vector graphics, in IE.