How do we resize a JPanel?

Hi,
I have 2 two JPanels and when I stick them onto a JFrame (size fixed to something), the panel on the right hand side has this annoying excess grey background. I cannot seem to remove this excess. After all, the panel on the right only contains a single column of buttons.
How do I remove the excess space??
Help

You should use a more convenient layout manager for your JFrame.
Denis

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How do I resize this JPanel withou cutting off content?

I need to make this JPanel smaller vertically. Every time I do it cuts off the bottom of the graph. How can I make it shorter without losing content?
TIA
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Graph extends JFrame implements ActionListener {
     JButton button;
     int []bar = new int[4];
     float []flote = {1395,1296,1402,1522};
     String []valuesInput = {"1395","1296","1402","1522"};
     String str = "", title="Title goes here";
     String []barLabels = {"pp01, Oct. 2003","pp02, Oct. 2003","pp01, Nov. 2003","pp02, Nov. 2003"};
     String []percent = {"","","",""};
     JLabel []JLab = new JLabel[4];
     JTextField titletxt;
     JTextField []Text = new JTextField[5];
     JTextField []labeltxt = new JTextField[5];
     boolean pieChart;
     public Graph() {
          Container c = getContentPane();
          JPanel panel = new JPanel(){
                 public void paintComponent(Graphics g) {
                    Graphics2D g2 = (Graphics2D)g;
                    g2.setColor(new Color(223,222,224));
                    g2.fillRect(0,0,550,400);
                    g2.setColor(Color.orange);
                    if(pieChart) {
                         g2.fillArc(30, 130, 220, 220, 90, -bar[0]);
                         g2.fillRect(270, 170, 30, 20);
                    else g2.fillRect(30, 150, bar[0], 30);
                    g2.setColor(Color.green);
                    if(pieChart) {
                         g2.fillArc(30, 130, 220, 220, 90-bar[0], -bar[1]);
                         g2.fillRect(270, 210, 30, 20);
                    else g2.fillRect(30, 190, bar[1], 30);
                    g2.setColor(Color.red);
                    if(pieChart) {
                         g2.fillArc(30, 130, 220, 220, 90-(bar[0]+bar[1]), -bar[2]);
                         g2.fillRect(270, 250, 30, 20);
                    else g2.fillRect(30, 230, bar[2], 30);
                    g2.setColor(Color.blue);
                    if(pieChart) {
                         g2.fillArc(30, 130, 220, 220, 90-(bar[0]+bar[1]+bar[2]), -bar[3]);
                         g2.fillRect(270, 290, 30, 20);
                    else g2.fillRect(30, 270, bar[3], 30);
                    g2.setColor(Color.black);
                    g2.setFont(new Font("Arial", Font.BOLD, 18));
                    if(pieChart) g2.drawString(title, 220, 142);
                    else g2.drawString(title, 50, 132);
                    g2.setFont(new Font("Arial", Font.PLAIN,16));
                    int temp=0;
                    if(pieChart) temp = 185;
                    else temp = 172;
                    for(int j=0; j <4; j++) {
                    if(pieChart) g2.drawString("$"+valuesInput[j]+" "+barLabels[j]+percent[j], 305, temp);//XXXXXXXXXXXXXXX
                    else g2.drawString("$"+valuesInput[j]+" "+barLabels[j]+percent[j], bar[j]+40, temp);
                    temp += 40;
                    if(!pieChart){
                         g2.drawLine(30, 130, 30, 300);
                         g2.drawLine(30, 300, 430, 300);
                         //g2.drawLine(210, 345, 210, 350);
                         //g2.drawLine(390, 345, 390, 350);
                         g2.setFont(new Font("Arial", Font.PLAIN,12));
                    super.paintComponent(g2);
          panel.setOpaque(false);
          panel.setLayout(new FlowLayout() );
          button = new JButton("Bar Graph");
          button.addActionListener(this);
          for (int k=0; k<4; k++){
               str = Integer.toString(k+1);
          panel.add(button);
          c.add(panel);
     public void actionPerformed(ActionEvent e) {
          String command = e.getActionCommand();
          if(command.equals("Bar Graph")){
               button.setText("Pie Chart");
               pieChart=false;
               try {
                    int temp =0;
                    java.text.DecimalFormat df = new java.text.DecimalFormat("#0.#");
                    for (int j=0; j<4; j++){
                         //flote[j] = Float.parseFloat(Text[j].getText());//XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
                         temp += (int)((flote[j]) +0.5);
                    for (int k=0; k<4; k++){
                    bar[k] = (int)(((flote[k]/temp) * 360)+0.5);
                         //barLabels[k] = labeltxt[k].getText();XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
                         flote[k] = (flote[k]/temp) *100;
                         percent[k] = ": "+df.format(flote[k])+"%";
               catch(Exception message){
                    title = "Oops! Complete all fields, enter numbers only";
          if(command.equals("Pie Chart")){
               button.setText("Bar Graph");
               pieChart=true;
          repaint();
     public static void main(String[] args) {
     Graph frame = new Graph();
     frame.setSize(550,400);
     //frame.setLocation(200, 200);
     frame.setResizable(false);
     frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
     frame.setVisible(true);

Try with this (it really works!):
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Graph extends JFrame implements ActionListener {
    int width;
    int height;
     JButton button;
     int []bar = new int[4];
     float []flote = {1395,1296,1402,1522};
     String []valuesInput = {"1395","1296","1402","1522"};
     String str = "", title="Title goes here";
     String []barLabels = {"pp01, Oct. 2003","pp02, Oct. 2003","pp01, Nov. 2003","pp02, Nov. 2003"};
     String []percent = {"","","",""};
     JLabel []JLab = new JLabel[4];
     JTextField titletxt;
     JTextField []Text = new JTextField[5];
     JTextField []labeltxt = new JTextField[5];
     boolean pieChart;
     public Graph() {
          Container c = getContentPane();
          JPanel panel = new JPanel(){
                 public void paintComponent(Graphics g) {
                     width = getWidth();
                     height = getHeight();
                    Graphics2D g2 = (Graphics2D)g;
                    //g2.scale(.95,.95);
                    g2.setColor(new Color(223,222,224));
                    g2.fillRect(0,0,width,height);
                    g2.setColor(Color.orange);
                    if(pieChart) {
                         g2.fillArc(getW(30), getH(130), getW(220), getH(220), 90, -bar[0]);
                         g2.fillRect(getW(270), getH(170), getW(30), getH(20));
                    else g2.fillRect(getW(30), getH(150), getW(bar[0]), getH(30));
                    g2.setColor(Color.green);
                    if(pieChart) {
                         g2.fillArc(getW(30), getH(130), getW(220), getH(220), 90-bar[0], -bar[1]);
                         g2.fillRect(getW(270), getH(210), getW(30), getH(20));
                    else g2.fillRect(getW(30), getH(190), getW(bar[1]), getH(30));
                    g2.setColor(Color.red);
                    if(pieChart) {
                         g2.fillArc(getW(30), getH(130), getW(220), getH(220), 90-(bar[0]+bar[1]), -bar[2]);
                         g2.fillRect(getW(270), getH(250), getW(30), getH(20));
                    else g2.fillRect(getW(30), getH(230), getW(bar[2]), getH(30));
                    g2.setColor(Color.blue);
                    if(pieChart) {
                         g2.fillArc(getW(30), getH(130), getW(220), getH(220), 90-(bar[0]+bar[1]+bar[2]), -bar[3]);
                         g2.fillRect(getW(270), getH(290), getW(30), getH(20));
                    else g2.fillRect(getW(30), getH(270), getW(bar[3]), getH(30));
                    g2.setColor(Color.black);
                    g2.setFont(new Font("Arial", Font.BOLD, 18));
                    if(pieChart) g2.drawString(title, getW(220), getH(142));
                    else g2.drawString(title, getW(50), getH(132));
                    g2.setFont(new Font("Arial", Font.PLAIN,16));
                    int temp=0;
                    if(pieChart) temp = 185;
                    else temp = 172;
                    for(int j=0; j <4; j++) {
                    if(pieChart) g2.drawString("$"+valuesInput[j]+" "+barLabels[j]+percent[j], getW(305), getH(temp));//XXXXXXXXXXXXXXX
                    else g2.drawString("$"+valuesInput[j]+" "+barLabels[j]+percent[j], getW(bar[j]+40), getH(temp));
                    temp += 40;
                    if(!pieChart){
                         g2.drawLine(getW(30), getH(130), getW(30), getH(300));
                         g2.drawLine(getW(30), getH(300), getW(430), getH(300));
                         //g2.drawLine(210, 345, 210, 350);
                         //g2.drawLine(390, 345, 390, 350);
                         g2.setFont(new Font("Arial", Font.PLAIN,12));
                    super.paintComponent(g2);
          panel.setOpaque(false);
          panel.setLayout(new FlowLayout() );
          button = new JButton("Bar Graph");
          button.addActionListener(this);
          for (int k=0; k<4; k++){
               str = Integer.toString(k+1);
          panel.add(button);
          c.add(panel);
     private int getW(int dx) {
         return (dx * width) / 550;
     private int getH(int dy) {
         return (dy * height) / 400;
     public void actionPerformed(ActionEvent e) {
          String command = e.getActionCommand();
          if(command.equals("Bar Graph")){
               button.setText("Pie Chart");
               pieChart=false;
               try {
                    int temp =0;
                    java.text.DecimalFormat df = new java.text.DecimalFormat("#0.#");
                    for (int j=0; j<4; j++){
                         //flote[j] = Float.parseFloat(Text[j].getText());//XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
                         temp += (int)((flote[j]) +0.5);
                    for (int k=0; k<4; k++){
                    bar[k] = (int)(((flote[k]/temp) * 360)+0.5);
                         //barLabels[k] = labeltxt[k].getText();XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
                         flote[k] = (flote[k]/temp) *100;
                         percent[k] = ": "+df.format(flote[k])+"%";
               catch(Exception message){
                    title = "Oops! Complete all fields, enter numbers only";
          if(command.equals("Pie Chart")){
               button.setText("Bar Graph");
               pieChart=true;
          repaint();
    public static void main(String[] args) {
        Graph frame = new Graph();
        frame.setSize(550,400);
        //frame.setLocation(200, 200);
        frame.setResizable(true);
        frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
        frame.setVisible(true);

Resize a JPAnel (use of scale)

Hello everybody,
Here's my problem: I have a panel full of components. This panel
can be scaled. So its size can vary. I have to modify the size of this panel (to make a zomm).
In the printing advanced
tutorial they say that I just have to resize the graphics in the print method with:
g2.scale(xScaleFactor,yScaleFactor);
But it only works for Graphics and no for JPanel..
My questions are:
how can I resize my Jpanel ?
Does it scales all the components in the panel?
Best Regards
Peio / [email protected]

You have to overwrite the paint method from your Painter component. For example a JFrame:
public void paint(Graphics g){
Graphics2D g2d = (Graphics2D)g;
int count = getComponentCount();
g2d.scale(scaleX, scaleY);
for(int i = 0; i < count; i++){
Component comp = getComponent(i);
comp.paint(g2d);
// Undo all
g2d.scale(1/scaleX, 1/scaleY);
public Dimension getPreferredSize(){
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}Good, if you have a scrollpanel... hmmm... you have to work a little more ;)

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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 drop component on JPanel

Hi,
i want to drop some component on JPanel.I'm talking about drag n drop concept, but how to apply it on JPanel.
For eg how to drag n drop an image from your tool bar to a JPanel.
Thanks in advance.

Hi,
thanks for ur reply.
But this link is not helping me much...more idea needed....actually my question is to use 'JPanel' to drop component....how to make it work?and also how to resize the component itself by streaching it's border ( something like taht )
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Edited by: DJgpmax on Jun 17, 2008 2:10 AM

How can I resize a JFrame ,to fit into the screen size

I have a Jframe which has JPanel and JPanel contains lot of other components.JPanel size is 980,1400. when i use JFrame.show method jpanel goes beyond the screen size in length and I am not able to see the portion below the screen.How can I resize the JFrame so that JFrame and JPanel shrinks to fit into the screen size.I need this because I have a PRINT button at bottom of the JPanel.Thanks.

Thank you for your reply.I tried with the following code as you have told.But the frame is still going beyond the screen.Can you please look into it and tell me whats wrong ?
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How do you resize multiple artboards in Illustrator at the same time?

Hi,
This is a question that has been bugging me for a while. I'm currently on CS6 but I'm looking for a solution that can also work on CS5 for a co-worker.
Having multiple artboards has been established since CS4 and I have yet to see an official way of resizing multiple artboards, if anything there should at least be a plug-in.
As great of a feature it is, it seems a little short sited. If one has multiple artboards one should be able to manage multiple artboards, right?
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I don't even see a batch render for artboards and Photoshop has that for its files.
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mec_os wrote:
you can resize the artwork on export. no need to draw it to size.
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mec_os wrote:
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Try dragging this file to the Îesktop & reboot...
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How do we resize a JPanel?

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