Re: Make a simple 4 row by 4 column scratch pad.
On Feb 25, 11:17 pm, bH <bherbs...@hotmail.com> wrote:
On Feb 25, 9:59 pm, "John B. Matthews" <nos...@nospam.invalid> wrote:
In article
<eb326c81-48d8-4e2c-9420-20b92402c...@d27g2000yqf.googlegroups.com>,
bH <bherbs...@hotmail.com> wrote:
I looked at Lew's comment again and went to the JTable tutorial. I
think that this might do it for the features explained how to edit
while main program is running. ... But I was hoping for something
simple than what is in the link above.
Yes, I think you need at least a renderer and editor to make it usable:
<http://java.sun.com/docs/books/tutorial/uiswing/components/table.html>
import java.awt.Color;
import java.awt.Component;
import java.awt.EventQueue;
import java.text.DecimalFormat;
import java.util.Arrays;
import javax.swing.DefaultCellEditor;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
public class TableGrid extends JPanel {
private DecimalFormat df = new DecimalFormat("#0.00");
private JTextField tf = new JTextField();
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame f = new JFrame("TableGrid");
f.setDefaultCloseOperation(JFrame.DISPO=
SE_ON_CLOSE);
f.add(new TableGrid());
f.pack();
f.setVisible(true);
}
});
}
public TableGrid() {
TableModel dataModel = new TableModel();
JTable table = new JTable(dataModel);
table.setCellSelectionEnabled(true);
table.setRowHeight(32);
table.setDefaultRenderer(Double.class, new DecRenderer(=
df));
table.setDefaultEditor(Double.class, new DecEditor(tf, =
df));
this.add(table);
}
private static class TableModel extends AbstractTableModel {
private static final int SIZE = 4;
private Double[][] matrix = new Double[SIZE][SIZE];
public TableModel() {
for (Object[] row : matrix) {
Arrays.fill(row, Double.valueOf(0));
}
}
@Override
public int getRowCount() {
return SIZE;
}
@Override
public int getColumnCount() {
return SIZE;
}
@Override
public Object getValueAt(int row, int col) {
return matrix[row][col];
}
@Override
public void setValueAt(Object value, int row, int col) =
{
matrix[row][col] = (Double) value;
}
@Override
public Class<?> getColumnClass(int col) {
return Double.class;
}
@Override
public boolean isCellEditable(int row, int col) {
return true;
}
}
private static class DecRenderer extends DefaultTableCellRender=
er {
DecimalFormat df;
public DecRenderer(DecimalFormat df) {
this.df = df;
this.setHorizontalAlignment(JLabel.CENTER);
this.setBackground(Color.lightGray);
}
@Override
protected void setValue(Object value) {
setText((value == null) ? "" : df.format(va=
lue));
}
}
private static class DecEditor extends DefaultCellEditor {
private JTextField tf;
private DecimalFormat df;
public DecEditor(JTextField tf, DecimalFormat df) {
super(tf);
this.tf = tf;
this.df = df;
tf.setHorizontalAlignment(JTextField.CENTER);
}
@Override
public Object getCellEditorValue() {
try {
return new Double(tf.getText());
} catch (NumberFormatException e) {
return Double.valueOf(0);
}
}
@Override
public Component getTableCellEditorComponent(JTable tab=
le,
Object value, boolean isSelected, int row, int =
column) {
tf.setText((value == null) ? "" : df.format=
((Double) value));
if (isSelected) tf.selectAll();
return tf;
}
}
}
--
John B. Matthews
trashgod at gmail dot com
<http://sites.google.com/site/drjohnbmatthews>
Hi John,
A really big thank you for your demo.
I am impressed by the coloring
on the cell chosen and the grid's 4 by 4 appearance.
With a very few modifications this scratch pad
is complete.
Making comment about my earlier questions
and answers that you helped me with, that is,
making sub images out of a larger image.
<http://groups.google.com/group/comp.lang.java.help/browse_thread/
thread/3eb3b7a6599b23ab# >
I have removed the control of the fixed grid.
<http://groups.google.com/group/comp.lang.java.help/browse_thread/
thread/76f86e4cfb54f6c6#>
I now move separate but shuffled sub images to
recombine into the original image.
It is highly graphical specific. Image movement is
not with a mouse but controls using
input from a JTextField(s) and a click on a custom drawing.
Your scratch pad helps me to keep track of
what numbered image to move when getting
to a stage of final alignment. There are 16
sub images.
Thanks again. I truly appreciate it.
bH- Hide quoted text -
- Show quoted text -
Hi All,
Taking a second look at the problem
of a Scratch pad, and at Roedy's suggestion
to write my own ("skinning the cat"),
this program runs and accomplishes the task of
making a "scratch sheet". The "0,1,2,... 15' numbers are
entered in the JTextField and based on where the mouse
click occurs, the grid and click locations and numbers are
maintained throughout the run of the program.
I am frustrated by the list of errors that
are displayed "during the run". I want help to correct them.
Your help is appreciated. First the program
and then the list of errors.
TIA,
bH
import java.awt.Point;
import java.awt.Color;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.ActionEvent;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class ScratchPadVer2 extends JFrame implements
ActionListener {
private Point clickPoint = null;
private JButton closeBtn = new JButton();
private int t = 20;
private int[] locX = new int[t];
private int[] locY = new int[t];
private String []cellItem = new String[t];
private JPanel infoPanel = new JPanel();
private JLabel topLbl1 = new JLabel ("Enter Picture Number " );
private JLabel topLbl2 = new JLabel ("Click on Pad Location" );
private JTextField numberTf = new JTextField("0",2);
private String holdString = " ";
ScratchPadVer2() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
init();
setVisible(true);
}
public void init() {
JPanel infoPanel= new JPanel();
infoPanel.setBackground(Color.yellow);
infoPanel.add(topLbl1);
infoPanel.add(numberTf);
infoPanel.add(topLbl2);
infoPanel.add(closeBtn);
closeBtn.setText("Close");
closeBtn.setActionCommand("Close");
closeBtn.addActionListener(this);
Container contentPane= getContentPane();
contentPane.add(infoPanel);
contentPane.setLayout(new GridLayout(1,1));
this.setSize(375,400);
this.setResizable(true);
setVisible(true);
for (int i = 0;i<16;i++){
locX[i] = 200 ;
locY[i] = 200 ;
cellItem[i] = "-1";
}
this.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent event){
clickPoint = event.getPoint();
System.out.println(clickPoint);
repaint();
}
});
}
public void actionPerformed(ActionEvent ae) {
String cmd = ae.getActionCommand();
if ("Close".equals(cmd)) {
System.exit(0);
}
}
public void paint(Graphics g) {
// draw the grid
super.paint(g);
Graphics2D g2 = (Graphics2D)g;
for (int xi = 1; xi <= 5; xi++) {
for (int yi = 1; yi <= 5; yi++) {
g.setColor(Color.red);
g.drawLine(xi * 60, 75, xi * 60, yi * 75);
g.setColor(Color.blue);
g.drawLine(60, yi * 75, xi * 60, yi * 75);
}
}
holdString = numberTf.getText();
if (numberTf.getText()!= null){
g.drawString(holdString ,clickPoint.x,clickPoint.y);
for (int ia = 1; ia <= 16; ia++) {
int t = Integer.parseInt(holdString );
if (ia == t){
locX[ia] = clickPoint.x;
locY[ia] = clickPoint.y;
cellItem [ia] = holdString;
}
}
for (int ib = 1; ib <= 16; ib++) {
int xc = locX[ib];
int yc = locY[ib];
String str = cellItem[ib];
if (cellItem[ib]!= "-1"){
g.drawString(str ,xc,yc);
}
}
}
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
new ScratchPadVer2();
}
});
}
}
Error listing:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at ScratchPadVer2.paint(ScratchPadVer2.java:93)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.seqPaintDirtyRegions(Unknown Source)
at javax.swing.SystemEventQueueUtilities
$ComponentWorkRequest.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown
Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown
Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)