How to scale a JPanel?

I have written an application which places JPanels on the screen inside another JPanel. I would like to scale what appears on the screen and have done this by changing the x, y, width and height values. However due to rounding if I scale up and down a lot I can get a slight change in relative values.
Is there another simple way to scale a JPanel?

I used a scalable panel in one of my programs. With no knowledge of coding layout managers, I used absolute positioning - the setBounds method the panel, and sub components.
Using a separate object to handle the scaling (responded to mouse wheel events) it maintained a double value for the desired scale. When this was updated, it fired off an event to each scalable panel to inform of the change in scale.
Each component had a default size and position. To calculate the new size/position, these values were multiplied by the scale and used, but NOT stored as the new default values..
Just remember, when drawing the panel, resizing the components, etc, always calculate from the default size / position, not the current one. This way you can remove the chance of slight indiscretions.
Hope this helps.

Similar Messages

How to make a JPanel selectable

When extending a JPanel and overriding the paintComponent() method the custom JPanel can not be selected so that it gets for example KeyEvents.
But if I make the new Class extend a JButton it gets of course selected and able to receive for example KeyEvents.
My question is therefore; what does the JButton implement that a JPanel doesn’t so that a JButton gets selectable? Or in other words; how to make a JPanel selectable?
Aleksander.

Try this extended code. Only the first panel added can get the Focus.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Test extends JFrame
public Test()
    setLocation(400,300);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    JPanel panel1 = new JPanel(new BorderLayout());
    JPanel panel2 = new JPanel(new BorderLayout());
    ImagePanel imgPanel = new ImagePanel();
    panel1.setFocusable(true);
    panel2.setFocusable(true);
    panel1.setPreferredSize(new Dimension(0, 50));
    panel2.setPreferredSize(new Dimension(0, 50));
    panel1.setBorder(BorderFactory.createLineBorder(Color.RED,     4));
    panel2.setBorder(BorderFactory.createLineBorder(Color.CYAN,    4));
    imgPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK, 4));
    panel1.add(new JLabel("Panel 1"), BorderLayout.CENTER);
    panel2.add(new JLabel("Panel 2"), BorderLayout.CENTER);
    getContentPane().add(panel1, BorderLayout.NORTH);
    getContentPane().add(panel2, BorderLayout.SOUTH);
    getContentPane().add(imgPanel, BorderLayout.CENTER);
    pack();
    panel1.addKeyListener(new KeyAdapter(){
        public void keyPressed(KeyEvent ke){
            System.out.println("Panel1");}});
    panel2.addKeyListener(new KeyAdapter(){
        public void keyPressed(KeyEvent ke){
            System.out.println("Panel2");}});
public static void main(String[] args){new Test().setVisible(true);}
class ImagePanel extends JPanel
Image img;
public ImagePanel()
    setFocusable(true);
    setPreferredSize(new Dimension(400,300));
    try{img = javax.imageio.ImageIO.read(new java.net.URL(getClass().getResource("Test.gif"), "Test.gif"));}
    catch(Exception e){/*handled in paintComponent()*/}
    addKeyListener(new KeyAdapter(){
      public void keyPressed(KeyEvent ke){
        System.out.println("ImagePanel");}});
public void paintComponent(Graphics g)
    if(img != null)
      g.drawImage(img, 0,0,this.getWidth(),this.getHeight(),this);
    else
      g.drawString("This space for rent",50,50);
}

How to dynamically resize JPanel at runtime??

Hello Sir:
I met a problem, I need to resize a small JPanel called panel within a main Control JPanel (with null Layout) if I click the mouse then I can Drag and Resize this small JPanel Border to the size I need at runtime, I know I can use panel.setSize() or panel.setPreferredSize() methods at design time,
But I have no idea how to do it even I search this famous fourm,
How to dynamically resize JPanel at runtime??
Can any guru throw some light or good example??
Thanks

Why are you using a null layout? Wouldn't having a layout manager help you in this situation?

How to place a JPanel at the center of another JPanel?

Can anyone tell me how to place a JPanel inside another JPanel? The first JPanel consists of three JPanels each consisting of a label&textfield and are placed using BoxLayout. The second JPanel is a big blank screen. So, i would like to put the first JPanel at the center of second JPanel(horizontally & vertically). The problem is that i don't have any other component. So,if i try to use FlowLayout, i am able to put it at the center(horizontally, not vertically) only on the top edge. I tried to use BoxLayout. But, i couldn't(as i don't have any other elements). I tried to create some blank elements. But, they are messing up the elements of my JPanel. Any cluesssssssss??????????

import java.awt.*;
import javax.swing.*;
public class CenteredLayout
    private JPanel getPanel()
        GridBagLayout gridbag = new GridBagLayout();
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.insets = new Insets(2,2,2,2);
        JPanel p = new JPanel(gridbag);
        addComponents(new JLabel("label 1"), new JTextField(8), p, gbc);
        addComponents(new JLabel("label 2"), new JTextField(8), p, gbc);
        addComponents(new JLabel("label 3"), new JTextField(8), p, gbc);
        JPanel panel = new JPanel(gridbag);
        panel.setBackground(Color.pink);
        gbc.anchor = GridBagConstraints.CENTER;
        gbc.insets = new Insets(0,0,0,0);
        panel.add(p, gbc);
        return panel;
    private void addComponents(Component c1, Component c2, Container c,
                               GridBagConstraints gbc)
        gbc.anchor = GridBagConstraints.EAST;
        gbc.gridwidth = GridBagConstraints.RELATIVE;
        c.add(c1, gbc);
        gbc.anchor = GridBagConstraints.WEST;
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        c.add(c2, gbc);
    public static void main(String[] args)
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(new CenteredLayout().getPanel());
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
}

How to scale down number of pages in ps files

I am having ps files that are havings 4 to 8 pages per file. Each page may contain just 5-6 lines and therefore though the content in total is not too much but there is unnecessay paper wastage.
Is it possible to make some changes in code inside ps files throgh notepad so that the content may be restricted to lesser number of pages. I am having programing skill in vfp,need guidance that what changes i need to do in ps script and where.
my sample ps file can be downloaded from
https://www.dropbox.com/s/l9n3juzltlajki2/1010568351.ps
Code is also replicated here
%!PS-Adobe-3.0
%Creator: iECCM
%Version: 0.1
%%Pages: 4
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/J{rectclip}b/K{0.79 SG}b/L{n m r z}b/M{0 0 m}b/N{0.80 SG}b/O{rotate}b/P{setlinecap}b/Q{setrgbcolor}b/R{n 4 -2 roll m dup 0 exch l1 exch 0 l1 neg 0 exch l1 o}b
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(0.00 - 36.00 [email protected]%)38 534 w
(-36.00)568 534 x
F8 (Total Discounts \(Rs.\))38 523 w
(-386.00)568 523 x
g n
F2 B (Plan    LO-KAR-LO-BAAT-OTHER)13 775 w
G
g n
F2 B (Phone Number / UserName    0731-2484034)580 775 x
G
U1
%%Page: 3 3
g n
F12 B (BHARAT SANCHAR NIGAM LIMITED)301 805 y
G
1 w1 594 774 2 774 L
g n
F2 B (Account Number    1010568351)13 789 w
G
g n
F2 B (Invoice Number    10105683510030)580 789 x
G
g n
F2 B (Invoice Date    05/09/2012)229 789 w
G
g n
F13 B (Page 3)496 16 w
G
g g n
/F15{/I 7.5 Fn2}b
F15 B (of 4)532 16 w
G
G
N 36 766 534 -8 i
F8 B (Usage Charges)38 759 w
(Phone Calls)38 749 w
(Units)258 749 w
(Duration/Volume)321 749 w
(Gross Amt)443 749 x
(Discount)505 749 x
(Net Amt)568 749 x
F9 (Local LL Other Operator)38 738 w
(2)258 737 w
(00:00:14)321 737 w
(2.40)443 737 x
(0.00)505 737 x
(2.400)568 737 x
F8 (Total Charges \(Rs.\))38 726 w
(2.40)443 726 x
(0.00)505 726 x
(2.40)568 726 x
F14 (For BB 1 Unit = 1 KB)38 716 w
g n
F2 B (Plan    RENT-FREE-SECOND-PHONE)13 775 w
G
g n
F2 B (Phone Number / UserName    0731-2484033)580 775 x
G
U1
%%Page: 4 4
g n
F12 B (BHARAT SANCHAR NIGAM LIMITED)301 805 y
G
1 w1 594 774 2 774 L
g n
F2 B (Account Number    1010568351)13 789 w
G
g n
F2 B (Invoice Number    10105683510030)580 789 x
G
g n
F2 B (Invoice Date    05/09/2012)229 789 w
G
g n
F13 B (Page 4)496 16 w
G
g g n
/F15{/I 7.5 Fn2}b
F15 B (of 4)532 16 w
G
G
N 36 766 534 -8 i
F8 B (Usage Charges)38 759 w
(Phone Calls)38 749 w
(Units)258 749 w
(Duration/Volume)321 749 w
(Gross Amt)443 749 x
(Discount)505 749 x
(Net Amt)568 749 x
F9 (BSNL Broadband)38 738 w
(15026372)258 737 w
(15026372)321 737 w
(0.00)443 737 x
(0.00)505 737 x
(0.000)568 737 x
F8 (Total Charges \(Rs.\))38 726 w
(0.00)443 726 x
(0.00)505 726 x
(0.00)568 726 x
F14 (For BB 1 Unit = 1 KB)38 716 w
g n
F2 B (Plan    BBG-COMBO-ULD-850-ANNUAL-COMMIT)13 775 w
G
g n
F2 B (Phone Number / UserName    an7312484034_wcdr)580 775 x
G
U1

thanks, i am trying to do that. in case I will need your help i will contact u again.
one more doubt.
F8 B (Recurring Charges)38 759 w
what does F8 B 38 759 & w denotes in the above string
what does y & z denote
and what means
/F15{/I 7.5 Fn2}b
On Wed, 12 Dec 2012 23:29:23 +0530 wrote
    Re: How to scale down number of pages in ps files
    created by abeddie in PostScript Programming - View the full discussion
Remember this is just a sample of what you could do and when your jobs changewhat you do would have to change. The edits are:1) find the %%Page 3 32) change the line above from: U1 to %U13) add the line: 0 792 ypos 72 sub sub neg translate4) Find the line with the smallest y position: F8 (Total Discounts \(Rs.\))38 523 w5) Add this line below: currentpoint /ypos exch def pop %added repeat steps 1-5 for but use for step 1:%%Page 4 4 and step 4: F14 (For BB 1 Unit = 1 KB)38 716 w       old before page 3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%F8 (Total Discounts \(Rs.\))38 523 w(-386.00)568 523 xg nF2 B (Plan    LO-KAR-LO-BAAT-OTHER)13 775 wGg nF2 B (Phone Number / UserName    0731-2484034)580 775 xGU1%%Page: 3 3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     old before page 4%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%F14 (For BB 1 Unit = 1 KB)38 716 wg nF2 B (Plan    RENT-FREE-SECOND-PHONE)13 775 wGg nF2 B (Phone Number / UserName    0731-2484033)580 775 xGU1%%Page: 4 4%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%     new before page 3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%F8 (Total Discounts \(Rs.\))38 523 wcurrentpoint /ypos exch def pop %added(-386.00)568 523 xg nF2 B (Plan    LO-KAR-LO-BAAT-OTHER)13 775 wGg nF2 B (Phone Number / UserName    0731-2484034)580 775 xG%U1 %commented out0 792 ypos 72 sub sub neg translate % added%%Page: 3 3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     new before page 4%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%currentpoint /ypos exch def pop %addedg nF2 B (Plan    RENT-FREE-SECOND-PHONE)13 775 wGg nF2 B (Phone Number / UserName    0731-2484033)580 775 xG 0 792 ypos 72 sub sub neg translate%U1 %commented out%%Page: 4 4%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 3
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In InDesign, how does one determine the pixel size of a text box? Specifically, we need to write text to specifications of 600 pixel width, and have no idea a) how to scale a text box to specific pixel width, b) how to

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Hello everyone!
I have a pressure transducer that has 4-20mA output, I'm wondering if someone could tell me how to scale current. I know I can put resistor accross the output to produce voltage but I want to do it in current.
Here's my hardwares:
Cole Parmer - Pressure Transducer
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PCI-6024E (I also have PCI-6259)
SCB-68
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KowdTek
LabVIEW 2009
One Step At A Time, Maybe Two...

Both test works just fine. I also test the input receiving a signal out of regular power supply.
This 6259 is realy flakey to me because we have another PC that has the same daq card and when I tried the code it works.
It's just too expensive to act up like this.
Thanks for your time Sam!
samantham wrote:
Hello,
Lets try testing the 6259 by creating an analog output 5 V and wiring it into an analog input channel. Another good test will be to send a 0-5 V sine wave into an analog input to check its response. All this testing in independent of the code and configurations you are already using.
Then, I would suggest testing an analog input with your code but where the signal is coming from an analog output from the 6259 rather than the sensor. I understand your code is intended to test current. So this last test would be without the 249 ohm resistor.
Let me know if the 6259 is working with these tests.
KowdTek
LabVIEW 2009
One Step At A Time, Maybe Two...

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Hello. I've been using Corel Xara for a long time - like, since '98 - and recently started using Illustrator CS3.
In Xara, one can set the scale for rulers and objects. For example, I can set up the rulers for inches and then define a scale of, say, 1-in equals 300-ft. Once done, the ruler no longer displays inches; it displays the scale feet. And, when entering dimensions for objects or grid locations, I can use, for example, 650-ft and it will understand that I mean 2.1667-in.
Is there any way to do the same sort of thing in Illustrator? I saw how to change the rulers to inches, millimeters, points, etc., but I have been unable to find how to scale the ruler to X:Y.
Any info?
Thanx!

Short answer: No.
Longer answer: To change the ruler measurments to a different predetermined system, simly control-click (Mac) or right-click (PC) on the rulers themselves. You can not set the application to auto-scale dimension like you describe. You can use math functions in dialog boxes though. So you could enter 600'*.125 for 600 ft times 1/8

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While you could hard code the scaling factor, it will be more flexible if you retrieve the scaling coefficients from the driver. To do this, you need to use the Analog Input>>General Properties>>Advanced>>Device Scaling Coefficients>>Device Scaling Coefficients properties under the DAQmx Channel Property Node. Look at the documentation for this property to see how it can be used to create a polynomial equation for scaling to volts.
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How to scale animation? (or apply scale transforms?)

Hi,
I made a flash game in 640x480 pixels resolution with lots of skeletal animation and bitmap-graphics. Now I want to recreate the very same game for 1024x768. Graphicwise this is no problem, since I've drawn the graphics in a much higher resolution anyway. But I have problems figuring out how to scale all the animations (tweens) I did in the Flash IDE. Needless to say I can scale each MovieClip to 160%, so they have the right size. But then the MovieClips graphical pieces look pixelated, so I would like to replace those pieces with their higher resoluted equivalents. However, if I do so the higher-resoluted-equivalents are, of course, in turn scaled to 160% as well, so they end up far too big. What I am looking for at this point is a way to apply the scale to the MovieClip as well as its contents. Is there a way to do this? And if not, how would you go at scaling animations / tweens to higher resolutions inside the Flash IDE?
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By the way, the animations are to be read by the DragonBones-plugin directly inside the Flash IDE (it creates a texture-atlas and xml-files out of the movieclips), so affecting things with Actionscript is no option.
Best regards

I also would recommend using a tool like the above mentioned. The process will otherwise require exactly what you don't want to do, replace each piece individually with adjustments.
There is some JSFL code that can help here but honestly learning a new language just to solve this one short case issue isn't really advisable.
It might be a good time to consider Stage3D however. While this is an even larger leap than re-importing and aligning all assets, the performance boost would be so amazing it would be well worth your time. 2D sponsored engines like Starling have a texture scale during import that can help here as it seems based on your desired resolution that mobile is or may be important.

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Hi there,
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Tamika

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Hi there,
I am workind on document, containing 470 linked images. I accidentaly did some operation with frame fitting probably, so all my images got non-proportional scaling now. Amount of Undos was not long enough...
Do you have some clever recipe how to scale them back to normal aspect ratio?

Well,
thank you for your reply, but I do not uderstand your advice clearly: If the chain link is not broken, I just resize the frame containing photo and keep that bad proportions which I want to get rid of.
OK, I can just click the Content Grabber circle button and resize the image manualy to be about fine. But in case of 470 links I hoped in some one-click-magic... {"Equalize the proportions of linked images" button to be exact }
Thank you...

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