'Soft' pointer in swing

Hi,
I wish to create a 'soft' pointer in swing, i.e. a second 'mouse' pointer that is controlled by a different device. I have all the control software working and a simple swing application that draws lines in response to gestures, but I can't find anything about creating new pointer as all the searches I run seem to result in tips on changing the mouse pointer size or image. Just to be clear: this is in addition to the mouse pointer, I don't want to control the mouse pointer itself with my device.
TIA,
Paul

I don't believe so... or if it is, they have a special relationship tieing them together.
why?

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Multitouch--does point overlap Swing Element?

Hello,
I am working on creating a multi-touch framework for java. I have all the camera/blob detection/blob tracking code written and functioning well. You have all been very helpful getting me this far! However, now I need to write some code that will make coordinates of tracked blobs interface with an api meant for single input points from a mouse: Swing.
My question is this: What is the best way to determine if a point (x, y) is within a swing element? Ultimately, I would like to be able to create an actionlistener class that can be applied to, for example, a JLabel. So, when a point representing a blob overlaps with a swing element, the actionperformed() fires.
What is the best way to go about this? Am I going in the right direction, or is there a simpler or better non-swing way to do this?
I appreciate all your input!
Cheers,
James

camickr wrote:
My question is this: What is the best way to determine if a point (x, y) is within a swing element?Use the contains(...) method.Okay, thanks! So from what I've been able to find, the code would be as follows:
SwingElement.contains(Point p);From what I read, it seems that Point p has to have coordinates relative to the position of the swing element. How would you recommend I get around this? Also, does this method work by comparing the minimum and maximum coordinates of the swing element to the coordinates of the point? If so, it probably wouldn't function correctly if, for example, it was used with a rotated ImageIcon. Other suggestions/ideas?
Thanks

Am I missing a basic point in Swing Gui

Hi,
Why does the text('Hello') not display. ??? The JFrame is empty with no component(JTextField). Here's my code:-
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class DspTxt extends JPanel {
     String txt="Hello" ;
     JTextField jtxt;
// Constr
     DspTxt(){
     jtxt= new JTextField(txt);
     JPanel panel= new JPanel(new BorderLayout());
     panel.add(jtxt);
     public static void main(String[] args) {
     JFrame mainframe = new JFrame();
          mainframe.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
          DspTxt f= new DspTxt();
          mainframe.getContentPane().add(f);
          mainframe.pack();
          mainframe.setVisible(true);
Thanks in advance
Gurmej

You created a jpanel in your constructor and added the jtextfield to it but you didn't add the jpanel to dsptxt. Dsptxt is a jpanel so you don't need to create a new one.
Run it like this :
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class DspTxt extends JPanel {
     String txt="Hello" ;
     JTextField jtxt;
     // Constr
     DspTxt(){
          jtxt= new JTextField(txt);
          add(jtxt);
     public static void main(String[] args) {
          JFrame mainframe = new JFrame();
          mainframe.addWindowListener(new WindowAdapter() {
               public void windowClosing(WindowEvent e) {System.exit(0);}
          DspTxt f= new DspTxt();
          mainframe.getContentPane().add(f);
          mainframe.pack();
          mainframe.setVisible(true);
}

Swing Layout for different screen resolution

Hi All,
I am developing an application which will always run in a FULL SCREEN mode.
I intend to make it working on all screen sizes (resoultions) and on different OS and devices.
Since I am new to Swing, could anyone of you suggest a good layout manager to manage the components?
I am using NetBeans 6.8 (which uses a GroupLayout) for designing the GUI but when I change the screen resolution, the arrangement is all messed up.
Also, I am not able to design my application's GUI using NetBeans GUI builder as there is noway I can get an idea of how things will look like in the EXTENDED_BOTH state.
It will be very helpful if anyone could suggest..
Thanks!

The entire point of Swing LayoutManagers is to get a (reasonably) consistent layout across different resolutions, window sizes, platforms, etc. Of course, different window sizes and aspect ratios will affect things slightly, but any LayoutManager properly used will do the job you're describing.
As for which LayoutManager to use, I think that's a misleading question because it's not uncommon to use multiple LayoutManagers for a single screen. But in my experience it's possible to do 95% of what you want using GridBagLayout and a properly nested hierarchy of JPanels. GridBagLayout is a pain to get used to (caution against re-using GridBagConstraints), but once you do it's amazing what you can get out of it.

Null pointer at DefaultListCellRenderer

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     at java.awt.Container.getPreferredSize(Container.java:973)
     at javax.swing.JComponent.getPreferredSize(JComponent.java:1264)
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     at java.awt.Container.layout(Container.java:835)
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     at java.awt.Container.validateTree(Container.java:910)
     at java.awt.Container.validateTree(Container.java:910)
     at java.awt.Container.validateTree(Container.java:910)
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your triangle and square variables are not initialized.
i think what you need is change the following lines or initialize the above two before you use them.
Polygon triangle = new Polygon(xPoints, yPoints, 3);                       //Triangle
Rectangle2D.Double square = new Rectangle2D.Double(370, 384, 20, 20);      //Squareto
triangle = new Polygon(xPoints, yPoints, 3);                       //Triangle
square = new Rectangle2D.Double(370, 384, 20, 20);      //Square

Hand held camera effect

hi,
I think i've worked this out but i wondered if there were any other tips.
I want to create a hand held camera effect in differing amounts from a very subtle one that looks real and would work well on say a talking head that has been shot on a locked off camera. to a more extreme version that could be used for a more edgy effect and when you don't mind nauseating your audience.
i've got it looking ok by changing the footage to 3d and using a camera. then using wiggle on point of interest with a few manually typed in z rot changes.
has anyone got any tips for this kind of effect. even mentioning what magnitude and frequency you use would be useful. as well as the kf animation types to get a natural feel
cheers

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Mylenium

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I have developed a Java-Application (JDBC-Tool) and noticed several bugs in the Swing components:
1. I have a JDialog in a JFrame. Now setting an hourglass-mousecursor in the dialog only works as long as the user does not move the cursor outside the dialog. If he does, the cursor gets to normal state again and even stays normal if I move it back into the dialog. There have been several tips here in the forum (glasspanes and so on), but none of them works for this case (Dialog in Frame). I consider this a bug in the Swing-components and hope it will be fixed soon. The behaviour is the same for 1.3 to 1.4.1
2. I derived AbstractTableModel, and have the effect that getValueAt(row,col) gets sometimes called with negative column-values (-2) !? I have implemented a sorting feature for the columns when pressing at the column header. If one does quick sorts after another, this problem may occur. I'm not sure if this is my bug or Sun's bug ;-) Any ideas, is this a known fact ?
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Apart from these points, the Swing-Components make a good impression to me, I like working with them.
Regards,
Christian Sy Software-Development
http://www.csy-software.de
[email protected]

1. I have a JDialog in a JFrame. Now setting an
hourglass-mousecursor in the dialog only works as long
as the user does not move the cursor outside the
dialog. If he does, the cursor gets to normal state
again and even stays normal if I move it back into the
dialog. There have been several tips here in the forum
(glasspanes and so on), but none of them works for
this case (Dialog in Frame). I consider this a bug in
the Swing-components and hope it will be fixed soon.
The behaviour is the same for 1.3 to 1.4.1The solution to this problem, is to execute the actual code and the setting of the hourglass in a separate thread. I don't recall the exact reason for that, but it sure worked for me. I found it somewhere in this forum....
2. I derived AbstractTableModel, and have the effect
that getValueAt(row,col) gets sometimes called with
negative column-values (-2) !? I have implemented a
sorting feature for the columns when pressing at the
column header. If one does quick sorts after another,
this problem may occur. I'm not sure if this is my bug
or Sun's bug ;-) Any ideas, is this a known fact ?This could be related to clicks which do not exactly hit the right column and getColumnIndexAtX() returns an invalid column. You should check your code which starts the sorting not to sort if the column is < 0
This isn't by chance the code where you set the hourglass as well. If yes this should definitely be done in a separate thread.
3. For the same scenario, I noticed that
model.getValueAt is called very often even when I move
only the mouse over the table. Well, he has to repaint
the elements which were under the mouse before, ok.
But I noticed that for 1.3.0, there were many more
calls than for 1.4. Seems like this has been
optimized...That's true. getValueAt() is constantly beeing called. Paying attention to memory allocation and performance there will speed up things.
Regards
Thomas

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I have added an RTf editor to an applet and it works fine but I have 2 questions,
1. Is there anyways I can get some kind of toolbar to display above it to do editing inside it.
2. when I copy and paste things into it they appear correctly except when I try to copy and paste a table it, won't work is there a way I can get it to work?
thank you

You can create your own Toolbar class. Basically, just extend a Panel object and set it's layout to FlowLayout. Then you can add images to the toolbar. Add a MouseListener to the Toolbar panel (well that is have it implement MouseListener). Attach the listener to the images (which are AWT Components).
You could have two images per "icon", one would be the off position, the other would be the on position.
I'm sure Swing has a better way, and I'll bet a more visual-design-time based API.
I hate Swing. Long live AWT! Although each has good and bad points. Swing is better for people who do not hard code things (i.e. don't really know java) - these would be the visual-design timers such as the Forte studio, JBuilder, etc. I am a hard (or hand) coder. I spend hours and hours typing long lines of detailed and intricate code. However, my apps run better and I can debug them faster - because I know what is happening, what it is called, and where it is and what it should be doing at any given point.

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I've installed PIM Sync for outlook, i have 2 pods, but the soft points to one pod, where do i change it to connect to the other pod?
thanks

Marcelo, if you go into the registry you can edit this settign and change your POD.
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http://wiki.services.openoffice.org/wiki/Documentation/DevGuide/OpenOffice.org_Developers_Guide
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Information regarding OOo is not on Sun websites, or in these forums. There may be 3rd-party sites that have some info regarding OOo use.

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Hi , I need a swing component which has the functionality as below
Initially, its looks like this
# Beverages
# Starters
# MainCourse
# Deserts
When the user clicks on > it should expand that menu item and show the individual items along with their icons.
# Beverages
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# Starters
# MainCourse
# Deserts
Is there any readily available swing component which I can use for this behavior ?
It is ok even the swing component misses out expand functionality when the "#" is clicked.

But how can I set the icons to what I need ? Read the tutorial!!!
There is no way you could have read the tutorial and understand how a JTree works in 10 minutes.
So do some work on you own. Read the tutorial. Search the forum for examples.
We've pointed you in the right direction so do some learning on your own.

How to find a point lies inside circle

Hi,
How do I find a point (x,y) is lies inside a circle? I trying to do a small shooting game.
If the user clicks inside the circle they get a point. I am using the Pythagoras theorem to achieve this. But I can't.
Please advice me.
Here is my code
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
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        curX = e.getX() - left;
        curY = e.getY() - top;
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public boolean isPointInCircle(){
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}Edited by: ghostbust555 on Jan 23, 2011 3:20 PM

Can I build a GUI application with SWING only without [import java.awt.*;]

I have seen several threads (in forums), books and tutorials about SWING and I see that they all mix SWING with AWT (I mean they import both Swing and AWT in their code).
The conclusion that comes out is:
It is good to learn about SWING and forget AWT as it won't be supported later. I have decided to do so, and I never include <<import java.awt.*;>> in my code.
But I see that you cannot do much without <<import java.awt.*;>>. For example this line which changes the background color:
<<frame.getContentPane().setBackground(Color.red)>>
works only with <<import java.awt.*;>>. I have seen that codes in this and other forums import awt to change the background. Why is that?
After all, I wonder, what can I do;
My question is, can I change the background (and of course do all other things listener, buttons etc) without using <<import java.awt.*;>>.
I would like to avoid using <<import java.awt.*;>> and using awt since my program will not work later.
In addition, I believe there is no point to learn awt, which later will not exist.
I know, I must have misunderstood something. I would appreceate it very much, if anyone could give me even a short answer.
Thank you in advance,
JMelsi

Since swing is a layer on top of awt, AWT will exist for as long as swing does.
If sun does ever remove AWT they will have to replace it something else swing can layer on to and you will probably only have to replace your import statements.
The main difference is the way there drawn to the screen.
You can do custom drawing on swing components but you can't on AWT.
If your using a desktop PC system it's probably best to use swing just in case you wish to do some custom drawing.
awt uses less memory than swing and is faster but swing can be extended. awt comes only as standard.
Say for example you wish to implement a JButton with a ProgressBar below the button text, this can be done with swing!

'Soft' pointer in swing

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