如何防止JPanel调整大小以填充JScrollPane
[英]How to prevent JPanel from resizing to fill JScrollPane
问题描述
使用Java，我正在使用GridBagLayout创建一个表单。 GUI位于JPanel内部，JPanel位于添加到JFrame的scrollPane内部。
我希望带有GUI的JPanel为固定大小，以防止表单被拉伸，但是，我希望JScrollPanel可以根据用户的喜好进行调整大小。 （类似于MS Paint，画布是我的JPanel）。 我要防止表单被拉伸的原因是因为我希望打印它，并且从现在的样子来看，打印后的表单几乎可以按照我想要的方式进行打印，但是如果在调整尺寸之前更改了框架，则会产生不利影响打印。
也许我的问题可以用打印的方式更好地解决，但是问题是我以前从未处理过这种级别的打印，并且无法找到类似的问题/教程来帮助我解决问题。 我的方向可能是这样做的“穷人的方式”，但是目前对我来说这是唯一对我有意义的方向，我是一位相当新手的Java程序员。
FrontierMain.java
public class FrontierMain {
public FrontierMain(){
JFrame frame = new JFrame();
frame.setTitle("Frontier Insulation Labor Record Tool");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
LaborRecordPanel recordPanel = new LaborRecordPanel();
frame.add(recordPanel.scrollPane);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
public void run(){
FrontierMain fm = new FrontierMain();
}
});
System.out.println("Hello, World");
}
}
LaborRecordPanel.java
public class LaborRecordPanel implements
Printable, ActionListener {
private Color shade = new Color(201,201,201); // color for shaded cells
private JLabel dateSpace[] = new JLabel[7];
private JLabel grandTotalSpace = new JLabel();
private JLabel locAndDescSpace = new JLabel();
private JLabel personnelSpace[] = new JLabel[10]; // empty cells
private JLabel calendarGridLines[] = new JLabel[300]; //empty labels for gridlines
private ImageIcon logoIcon = new ImageIcon("Images/fici_logo1.jpg");
private JLabel logoLabel = new JLabel(logoIcon);
private JLabel authorizedBy = new JLabel("AUTHORIZED BY:");
private JLabel toCertify = new JLabel("THIS IS TO CERTIFY THAT THE ABOVE LABOR HAS BEEN PERFORMED.");
private JLabel laborRecordNO = new JLabel("NO.");
private JLabel nameOfJob = new JLabel("NAME OF JOB:");
private JLabel customerPO = new JLabel("CUSTOMER PO #:");
private JLabel contractNO = new JLabel("CONTRACT NO.");
private JLabel weekEnding = new JLabel("WEEK ENDING");
private JLabel personnelList = new JLabel("<html>LIST SUPERVISION &<br> CRAFT LABOR BELOW:</html>");
private JLabel locAndDescriptionLabel = new JLabel("LOCATION AND DESCRIPTION:");
private JLabel personnelTitle = new JLabel("TITLE");
private JLabel supt = new JLabel("SUPT.");
private JLabel foreman = new JLabel("FOREMAN");
private JLabel[] mechanic= new JLabel[8];
private JLabel calendarTitle = new JLabel("NUMBER OF HOURS WORKED @ SITE");
private JLabel dayHeading = new JLabel("DAY");
private JLabel dateHeading = new JLabel("DATE");
private JLabel[] ot2 = new JLabel[10];
private JLabel[] ot1 = new JLabel[10];
private JLabel[] st = new JLabel[10];
private JLabel mon = new JLabel("MON");
private JLabel tues = new JLabel("TUES");
private JLabel wed = new JLabel("WED");
private JLabel thur = new JLabel("THUR");
private JLabel fri = new JLabel("FRI");
private JLabel sat = new JLabel("SAT");
private JLabel sun = new JLabel("SUN");
private JLabel totalHours = new JLabel("<html>TOTAL<br> HOURS</html>");
private JLabel ratePerHour = new JLabel("<html>RATE<br> PER<br> HOUR</html>");
private JLabel totalAmount = new JLabel("<html>TOTAL<br> AMOUNT</html>");
private JLabel grandTotal = new JLabel("TOTAL");
JPanel rp = new JPanel();
JScrollPane scrollPane = new JScrollPane(rp);
LaborRecordPanel(){
rp.setPreferredSize(new Dimension(1295,1830 ));
rp.setMinimumSize(new Dimension(1295,1830 ));
rp.setMaximumSize(new Dimension(1295,1830 ));
scrollPane.setPreferredSize(new Dimension(900,700 ));
scrollPane.getVerticalScrollBar().setUnitIncrement(16); //increase the scroll speed
for (int i = 0; i <= 7; i++) mechanic[i] = new JLabel("MECHANIC"); // create mechanic labels
for (int i = 0; i <= 9; i++) //create labels for work time
{
ot2[i] = new JLabel("OT-2");
ot1[i] = new JLabel("OT-1");
st[i] = new JLabel("S.T.");
}
//create empty labels for gridlines
for (int i = 0; i <= 9; i++) personnelSpace[i] = new JLabel();
for (int i = 0; i <= 6; i++) dateSpace[i] = new JLabel();
for (int i = 0; i <= 299; i++) calendarGridLines[i] = new JLabel();
GridBagLayout gridbag = new GridBagLayout();
rp.setBackground(Color.WHITE);
rp.setBorder(BorderFactory.createLineBorder(Color.BLACK, 1));
GridBagConstraints gbc = new GridBagConstraints();
rp.setLayout(gridbag);
//gbc.insets = new Insets(5, 5, 5, 5);
//row 0////////////////////////////////////////////////////////////
gbc.fill = GridBagConstraints.BOTH;
gbc.gridx = 10;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.weighty = 1;
gbc.gridheight = 1;
gbc.gridwidth = 1;
laborRecordNO.setHorizontalAlignment(JLabel.CENTER);
laborRecordNO.setFont(new Font("Dialog", Font.PLAIN, 18));
gridbag.setConstraints(laborRecordNO, gbc);
rp.add(laborRecordNO, gbc);
//row 1////////////////////////////////////////////////////////////
gbc.gridx = 0;
gbc.gridy = 1;
gbc.gridwidth = 13;
gridbag.setConstraints(logoLabel, gbc);
rp.add(logoLabel, gbc);
//row 2////////////////////////////////////////////////////////////
gbc.gridx = 0;
gbc.gridy = 2;
gbc.gridheight = 1;
gbc.gridwidth = 1;
nameOfJob.setFont(nameOfJob.getFont().deriveFont(18.0f));
gridbag.setConstraints(nameOfJob, gbc);
rp.add(nameOfJob, gbc);
gbc.gridx = 6;
gbc.gridy = 2;
gbc.gridheight = 1;
gbc.gridwidth = 3;
contractNO.setFont(contractNO.getFont().deriveFont(18.0f));
gridbag.setConstraints(contractNO, gbc);
rp.add(contractNO, gbc);
//row 3////////////////////////////////////////////////////////////
gbc.gridx = 0;
gbc.gridy = 3;
gbc.gridheight = 1;
gbc.gridwidth = 1;
customerPO.setFont(customerPO.getFont().deriveFont(18.0f));
gridbag.setConstraints(customerPO, gbc);
rp.add(customerPO, gbc);
gbc.gridx = 6;
gbc.gridy = 3;
gbc.gridheight = 1;
gbc.gridwidth = 3;
weekEnding.setFont(weekEnding.getFont().deriveFont(18.0f));
gridbag.setConstraints(weekEnding, gbc);
rp.add(weekEnding, gbc);
//row 4////////////////////////////////////////////////////////////
gbc.gridx = 0;
gbc.gridy = 4;
gbc.gridheight = 3;
gbc.gridwidth = 1;
personnelList.setHorizontalAlignment(JLabel.CENTER);
personnelList.setBorder(BorderFactory.createLineBorder(Color.BLACK, 1));
personnelList.setFont(personnelList.getFont().deriveFont(18.0f));
gridbag.setConstraints(personnelList, gbc);
rp.add(personnelList, gbc);
gbc.gridx = 1;
gbc.gridy = 4;
gbc.gridheight = 3;
gbc.gridwidth = 1;
personnelTitle.setHorizontalAlignment(JLabel.CENTER);
personnelTitle.setBorder(BorderFactory.createMatteBorder(1, 0, 1, 0, Color.BLACK));
personnelTitle.setFont(personnelTitle.getFont().deriveFont(18.0f));
gridbag.setConstraints(personnelTitle, gbc);
rp.add(personnelTitle, gbc);
gbc.gridx = 2;
gbc.gridy = 4;
gbc.gridwidth = 8;
gbc.gridheight = 1;
calendarTitle.setHorizontalAlignment(JLabel.CENTER);
calendarTitle.setBorder(BorderFactory.createMatteBorder(1, 1, 1, 0, Color.BLACK));
calendarTitle.setFont(calendarTitle.getFont().deriveFont(18.0f));
gridbag.setConstraints(calendarTitle, gbc);
rp.add(calendarTitle, gbc);
gbc.gridx = 10;
gbc.gridy = 4;
gbc.gridheight = 3;
gbc.gridwidth = 1;
totalHours.setHorizontalAlignment(JLabel.CENTER);
totalHours.setBorder(BorderFactory.createMatteBorder(1, 1, 1, 1, Color.BLACK));
totalHours.setFont(totalHours.getFont().deriveFont(18.0f));
gridbag.setConstraints(totalHours, gbc);
rp.add(totalHours, gbc);
gbc.gridx = 11;
gbc.gridy = 4;
gbc.gridheight = 3;
gbc.gridwidth = 1;
ratePerHour.setHorizontalAlignment(JLabel.CENTER);
ratePerHour.setBorder(BorderFactory.createMatteBorder(1, 0, 1, 0, Color.BLACK));
ratePerHour.setFont(ratePerHour.getFont().deriveFont(18.0f));
gridbag.setConstraints(ratePerHour, gbc);
rp.add(ratePerHour, gbc);
gbc.gridx = 12;
gbc.gridy = 4;
gbc.gridheight = 3;
gbc.gridwidth = 1;
totalAmount.setHorizontalAlignment(JLabel.CENTER);
totalAmount.setBorder(BorderFactory.createMatteBorder(1, 1, 1, 1, Color.BLACK));
totalAmount.setFont(totalAmount.getFont().deriveFont(18.0f));
gridbag.setConstraints(totalAmount, gbc);
rp.add(totalAmount, gbc);
//row 5//////////////////////////////////////////////////////////////////
gbc.gridx = 2;
gbc.gridy = 5;
gbc.gridheight = 1;
gbc.gridwidth = 1;
dayHeading.setHorizontalAlignment(JLabel.CENTER);
dayHeading.setBorder(BorderFactory.createMatteBorder(0, 1, 1, 1, Color.BLACK));
dayHeading.setFont(dayHeading.getFont().deriveFont(18.0f));
gridbag.setConstraints(dayHeading, gbc);
rp.add(dayHeading, gbc);
gbc.gridx = 3;
gbc.gridy = 5;
gbc.gridheight = 1;
gbc.gridwidth = 1;
mon.setHorizontalAlignment(JLabel.CENTER);
mon.setBorder(BorderFactory.createMatteBorder(0, 0, 1, 0, Color.BLACK));
mon.setFont(mon.getFont().deriveFont(18.0f));
gridbag.setConstraints(mon, gbc);
rp.add(mon, gbc);
gbc.gridx = 4;
gbc.gridy = 5;
gbc.gridheight = 1;
gbc.gridwidth = 1;
tues.setHorizontalAlignment(JLabel.CENTER);
tues.setBorder(BorderFactory.createMatteBorder(0, 1, 1, 1, Color.BLACK));
tues.setFont(tues.getFont().deriveFont(18.0f));
gridbag.setConstraints(tues, gbc);
rp.add(tues, gbc);
gbc.gridx = 5;
gbc.gridy = 5;
gbc.gridheight = 1;
gbc.gridwidth = 1;
wed.setHorizontalAlignment(JLabel.CENTER);
wed.setBorder(BorderFactory.createMatteBorder(0, 0, 1, 0, Color.BLACK));
wed.setFont(wed.getFont().deriveFont(18.0f));
gridbag.setConstraints(wed, gbc);
rp.add(wed, gbc);
gbc.gridx = 6;
gbc.gridy = 5;
gbc.gridheight = 1;
gbc.gridwidth = 1;
thur.setHorizontalAlignment(JLabel.CENTER);
thur.setBorder(BorderFactory.createMatteBorder(0, 1, 1, 1, Color.BLACK));
thur.setFont(thur.getFont().deriveFont(18.0f));
gridbag.setConstraints(thur, gbc);
rp.add(thur, gbc);
gbc.gridx = 7;
gbc.gridy = 5;
gbc.gridheight = 1;
gbc.gridwidth = 1;
fri.setHorizontalAlignment(JLabel.CENTER);
fri.setBorder(BorderFactory.createMatteBorder(0, 0, 1, 0, Color.BLACK));
fri.setFont(fri.getFont().deriveFont(18.0f));
gridbag.setConstraints(fri, gbc);
rp.add(fri, gbc);
gbc.gridx = 8;
gbc.gridy = 5;
gbc.gridheight = 1;
gbc.gridwidth = 1;
sat.setHorizontalAlignment(JLabel.CENTER);
sat.setBorder(BorderFactory.createMatteBorder(0, 1, 1, 1, Color.BLACK));
sat.setFont(sat.getFont().deriveFont(18.0f));
gridbag.setConstraints(sat, gbc);
rp.add(sat, gbc);
gbc.gridx = 9;
gbc.gridy = 5;
gbc.gridheight = 1;
gbc.gridwidth = 1;
sun.setHorizontalAlignment(JLabel.CENTER);
sun.setBorder(BorderFactory.createMatteBorder(0, 0, 1, 0, Color.BLACK));
sun.setFont(sun.getFont().deriveFont(18.0f));
gridbag.setConstraints(sun, gbc);
rp.add(sun, gbc);
//row 6//////////////////////////////////////////////////////////////
gbc.gridx = 2;
gbc.gridy = 6;
gbc.gridheight = 1;
gbc.gridwidth = 1;
dateHeading.setHorizontalAlignment(JLabel.CENTER);
dateHeading.setBorder(BorderFactory.createMatteBorder(0, 1, 1, 1, Color.BLACK));
dateHeading.setFont(dateHeading.getFont().deriveFont(18.0f));
gridbag.setConstraints(dateHeading, gbc);
rp.add(dateHeading, gbc);
int dateSpaceIndex = 3;
boolean flip = true;
for (int k = 0; k <= 6; k++)//create gridlines for day area
{
gbc.gridx = dateSpaceIndex;
gbc.gridy = 6;
gbc.gridheight = 1;
gbc.gridwidth = 1;
if(flip) dateSpace[k].setBorder(BorderFactory.createMatteBorder(0, 0, 1, 0, Color.BLACK));
else dateSpace[k].setBorder(BorderFactory.createMatteBorder(0, 1, 1, 1, Color.BLACK));
gridbag.setConstraints(dateSpace[k], gbc);
rp.add(dateSpace[k], gbc);
dateSpaceIndex++;
flip = !flip;
}
//row 7/////////////////////////////////////////////////////////////
gbc.gridx = 1;
gbc.gridy = 7;
gbc.gridheight = 3;
gbc.gridwidth = 1;
supt.setHorizontalAlignment(JLabel.CENTER);
supt.setBorder(BorderFactory.createMatteBorder(0, 0, 1, 0, Color.BLACK));
supt.setFont(supt.getFont().deriveFont(18.0f));
gridbag.setConstraints(supt, gbc);
rp.add(supt, gbc);
//row 10///////////////////////////////////////////////////////////
gbc.gridx = 1;
gbc.gridy = 10;
gbc.gridheight = 3;
gbc.gridwidth = 1;
foreman.setHorizontalAlignment(JLabel.CENTER);
foreman.setBorder(BorderFactory.createMatteBorder(0, 0, 1, 0, Color.BLACK));
foreman.setFont(foreman.getFont().deriveFont(18.0f));
gridbag.setConstraints(foreman, gbc);
rp.add(foreman, gbc);
//row 13-36 plus 7-12 time worked labels//////////////////////////
for (int r = 0; r <= 7; r++)
{
gbc.gridx = 1;
gbc.gridy = 13 + (3*r);
gbc.gridheight = 3;
gbc.gridwidth = 1;
mechanic[r].setHorizontalAlignment(JLabel.CENTER);
mechanic[r].setBorder(BorderFactory.createMatteBorder(0, 0, 1, 0, Color.BLACK));
mechanic[r].setFont(mechanic[r].getFont().deriveFont(18.0f));
gridbag.setConstraints(mechanic[r], gbc);
rp.add(mechanic[r], gbc);
}
for (int c = 0; c <= 9; c++){
gbc.gridx = 2;
gbc.gridy = 7 + (3*c);
gbc.gridheight = 1;
gbc.gridwidth = 1;
ot2[c].setHorizontalAlignment(JLabel.CENTER);
ot2[c].setBorder(BorderFactory.createMatteBorder(0, 1, 1, 1, Color.BLACK));
ot2[c].setFont(ot2[c].getFont().deriveFont(18.0f));
gridbag.setConstraints(ot2[c], gbc);
rp.add(ot2[c], gbc);
gbc.gridx = 2;
gbc.gridy = 8 + (3*c);
gbc.gridheight = 1;
gbc.gridwidth = 1;
ot1[c].setHorizontalAlignment(JLabel.CENTER);
ot1[c].setOpaque(true);
ot1[c].setBackground(shade);
ot1[c].setBorder(BorderFactory.createMatteBorder(0, 1, 1, 1, Color.BLACK));
ot1[c].setFont(ot1[c].getFont().deriveFont(18.0f));
gridbag.setConstraints(ot1[c], gbc);
rp.add(ot1[c], gbc);
gbc.gridx = 2;
gbc.gridy = 9 + (3*c);
gbc.gridheight = 1;
gbc.gridwidth = 1;
st[c].setHorizontalAlignment(JLabel.CENTER);
st[c].setBorder(BorderFactory.createMatteBorder(0, 1, 1, 1, Color.BLACK));
st[c].setFont(st[c].getFont().deriveFont(18.0f));
gridbag.setConstraints(st[c], gbc);
rp.add(st[c], gbc);
}
//row 37/////////////////////////////////////////////////////////////////
gbc.gridx = 0;
gbc.gridy = 37;
gbc.gridheight = 1;
gbc.gridwidth = 1;
locAndDescriptionLabel.setFont(locAndDescriptionLabel.getFont().deriveFont(18.0f));
gridbag.setConstraints(locAndDescriptionLabel, gbc);
rp.add(locAndDescriptionLabel);
gbc.gridx = 11;
gbc.gridy = 37;
gbc.gridheight = 1;
gbc.gridwidth = 1;
grandTotal.setHorizontalAlignment(JLabel.CENTER);
grandTotal.setOpaque(true);
grandTotal.setBackground(Color.BLACK);
grandTotal.setForeground(Color.WHITE);
grandTotal.setBorder(BorderFactory.createLineBorder(Color.BLACK,1));
grandTotal.setFont(grandTotal.getFont().deriveFont(18.0f));
gridbag.setConstraints(grandTotal, gbc);
rp.add(grandTotal);
gbc.gridx = 12;
gbc.gridy = 37;
gbc.gridwidth = 1;
gbc.gridheight = 1;
grandTotalSpace.setBorder(BorderFactory.createMatteBorder(0, 1, 1, 1, Color.BLACK));
gridbag.setConstraints(grandTotalSpace, gbc);
rp.add(grandTotalSpace);
//row 38////////////////////////////////////////////////////////////////
gbc.gridx = 0;
gbc.gridy = 38;
gbc.gridwidth = 10;
gbc.gridheight = 1;
gbc.ipady = 80;
locAndDescSpace.setBorder(BorderFactory.createLineBorder(Color.BLACK,1));
gridbag.setConstraints(locAndDescSpace, gbc);
rp.add(locAndDescSpace);
//row 39////////////////////////////////////////////////////////////////
gbc.ipady = 0; //reset to default
gbc.gridx = 0;
gbc.gridy = 39;
gbc.gridheight = 1;
gbc.gridwidth = 2;
toCertify.setFont(toCertify.getFont().deriveFont(18.0f));
gridbag.setConstraints(toCertify, gbc);
rp.add(toCertify);
//row 40///////////////////////////////////////////////////////////////
gbc.gridx = 0;
gbc.gridy = 40;
gbc.gridheight = 1;
gbc.gridwidth = 3;
authorizedBy.setFont(authorizedBy.getFont().deriveFont(18.0f));
gridbag.setConstraints(authorizedBy, gbc);
rp.add(authorizedBy);
for (int r = 0; r <= 9; r++)//gridlines for personnel space
{
gbc.gridx = 0;
gbc.gridy = 7 + (3*r);
gbc.gridheight = 3;
gbc.gridwidth = 1;
personnelSpace[r].setBorder(BorderFactory.createMatteBorder(0, 1, 1, 1, Color.BLACK));
gridbag.setConstraints(personnelSpace[r], gbc);
rp.add(personnelSpace[r]);
}
//create calendar grid lines
int yPointer = 7;
int xPointer = 3;
int shadePtr = 8;
for (int j = 0; j <= 299; j++)
{
gbc.gridx = xPointer;
gbc.gridy = yPointer;
gbc.gridheight = 1;
gbc.gridwidth = 1;
calendarGridLines[j].setBorder(BorderFactory.createMatteBorder(0, 0, 1, 0, Color.BLACK));
if (yPointer == shadePtr){ //if row number = shadePtr then color the cell
calendarGridLines[j].setOpaque(true);
calendarGridLines[j].setBackground(shade);
}
gridbag.setConstraints(calendarGridLines[j], gbc);
rp.add(calendarGridLines[j]);
xPointer++; //go to next cell in row
j++; //use the next jlabel
gbc.gridx = xPointer;
gbc.gridy = yPointer;
gbc.gridheight = 1;
gbc.gridwidth = 1;
calendarGridLines[j].setBorder(BorderFactory.createMatteBorder(0, 1, 1, 1, Color.BLACK));
if (yPointer == shadePtr){ //if row number = shadePtr then color the cell
calendarGridLines[j].setOpaque(true);
calendarGridLines[j].setBackground(shade);
}
gridbag.setConstraints(calendarGridLines[j], gbc);
rp.add(calendarGridLines[j]);
xPointer++; //go to next cell in row
if(xPointer == 13) //if end of column then go to next row and reset column pointer to 3 and increment shade pointer by 3
{
yPointer++; //go down a row
xPointer = 3;
if((j % 3) == 0) {
shadePtr = yPointer;
}
}
}
JButton printTest = new JButton("PrintTest");
printTest.addActionListener(this);
gbc.gridx = 0;
gbc.gridy = 41;
gbc.gridheight = 1;
gbc.gridwidth = 1;
gridbag.setConstraints(printTest, gbc);
rp.add(printTest);
}
@Override
public void actionPerformed(ActionEvent e) {
PrinterJob printJob = PrinterJob.getPrinterJob();
printJob.setPrintable(this);
if (printJob.printDialog()){
try{
printJob.print();
}
catch(Exception ex){
throw new RuntimeException(ex);
}
}
}
@Override
public int print(Graphics g, PageFormat pf, int index)
throws PrinterException {
Graphics2D g2 = (Graphics2D)g;
if (index >= 1){
return Printable.NO_SUCH_PAGE;
}
else {
AffineTransform originalTransform = g2.getTransform();
double scaleX = pf.getImageableWidth() / rp.getWidth();
double scaleY = pf.getImageableHeight() / rp.getHeight();
// Maintain aspect ratio
double scale = Math.min(scaleX, scaleY);
g2.translate(pf.getImageableX(), pf.getImageableY());
g2.scale(scale, scale);
rp.printAll(g2);
g2.setTransform(originalTransform);
return Printable.PAGE_EXISTS;
}
}
}
2 个解决方案
解决方案1
1 已采纳 2014-02-17 21:31:58
我将主GUI面板放在另一个JPanel中，该面板位于JScrollPane内部。 这样可以防止我的主GUI调整为框架大小。 取而代之的是“外部” JPanel的大小。
解决方案2
0 2014-02-14 16:41:42
在您的JPanel上，您可以同时使用：
setSize( w, h)
setPreferredSize()
或添加组件侦听器以手动处理调整大小事件的“重绘/无效”
JPanel component = new JPanel();
component.addComponentListener(new ComponentListener()
{
public void componentResized(ComponentEvent evt) {
Component c = (Component)evt.getSource();
//........
}
});
在JScrollPane内部调整JPanel的大小可以清除我在JPanel上绘制的内容
[英]Resizing a JPanel inside of a JScrollPane clears the things I've drawn on the JPanel
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