Find index by xy ??

[Jimmy Nilsson]

Hey

I got an Array that contains info about words, and the position thay shold be printed on the Drawing.

I use a defultStyledDocument where i use colors.

Say that the first word is placed some rows down, and i only got the x y value of this, not how many /n i realy need. Is there a way to give a x y(point) value and get the postione in the styled document?

Or do i have to calculate the rows my self(with scalings) and the have a loop that adds "\n" as many times as needed to the string?

This is not easy, i dont know the row size and it can be in diffrent scales to.

Do you have any ide how i could solve this in a good way?

//Jimmy

[Jimmy Nilsson]

I shold also mension that i am loading this Styled document in to a JTextPane.

//Jimmy

[Craig Wood]

In the JTextPane api scroll down to the section Methods inherited from class javax.swing.text.JTextComponent to find the modelToView and viewToModel methods.

[Jimmy Nilsson]

Thanks!

I have now tryed to go from positioning(point(XY)) to rows, but i dont get the right XY value.

Here is a code, first i count all the "\n" in the StyledDocument, and it is 221, then i whant to know the XY value for the last row, and by this i tke the JTextPane and use modelToView with the 221 as argument, and then get the Y out of the rectangle.

int endRow = this.BP.getLastRowNr()+5; // 221
int endY = (int)TextP.modelToView(endRow).getY();

this shold work, but the value is not right
Row : 221 (sounds right)
Y : 302 (do NOT sound right) is shold be over 5000 i think.

I am drawing a frame round the text and this frame is not bigger then 18 rows if i calc them by hand in the view, if i could get a proper valu out of modelToView then it would fit the text perfect(around 5000 rows or somthing)

Regards
Jimmy

[Jimmy Nilsson]

I have notice that i have to add around 3350 to the current row nr to get it it right, this mean that 3571 rows is getting me the right Y value to my 221 rows, this dosent simes right, what am i doing wrong here?

//Jimmy

[Jimmy Nilsson]

Anyone?

[Jimmy Nilsson]

It simes like it is counting the positions in the string to the Styled dokument and sees were on the JTexPanel it is. that means that if there is alot of text on one row say

1. "Here is som text\n"
2. "and here is the new row"

An if i then send 2 as an argument( i whant to know rows two Position(XY) but in will get the position of r instead.

Pleas is there any way to get the positon by giving a row nr, say 2 in this case?

O do i have to come up with somthing on my own here? like counting all the "\n"? and then take the position right after the "\n" and get the XY Position?

//Jimmy

[Craig Wood]

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
 
public class TextTest
{
    JTextPane textPane;
    StyledDocument doc;
    JLabel docPosition, xyLocation;
 
    public TextTest()
    {
        textPane = new JTextPane();
        textPane.setMargin(new Insets(5,5,5,5));
        textPane.addMouseListener(new PointSelector(this));
        doc = (StyledDocument)textPane.getStyledDocument();
        initDocument();
        System.out.println("document length = " + doc.getLength());
        docPosition = new JLabel(" ", JLabel.CENTER);
        xyLocation  = new JLabel(" ", JLabel.CENTER);
        docPosition.setBorder(
                       BorderFactory.createTitledBorder("document model position"));
        xyLocation.setBorder(BorderFactory.createTitledBorder("xy view location"));
        JPanel south = new JPanel(new GridLayout(0,1));
        south.add(docPosition);
        south.add(xyLocation);
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(new JScrollPane(textPane));
        f.getContentPane().add(south, "South");
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
    }
 
    public void findModelPosition(Point p)
    {
        int position = textPane.viewToModel(p);
        docPosition.setText(String.valueOf(position));
        xyLocation.setText("x = " + p.x + "   y = " + p.y);
    }
 
    private void initDocument()
    {
        String[] initString = {
            "Caret Changes",
            "The caret is a pluggable object in swing text components.",
            "Notification of changes to the caret position and the selection " +
            "are sent to implementations of the CaretListener interface that " +
            "have been registered with the text component.",
            "The UI will install a default caret unless a customized caret " +
            "has been set. ",
            "Commands",
            "Text components provide a number of commands that can be used " +
            "manipulate the component.",
            "This is essentially the way that the component expresses its " +
            "capabilities.",
            "These are expressed in terms of the swing Action interface, " +
            "using the TextAction implementation.",
            "The set of commands supported by the text component can be found " +
            "with the getActions() method.",
            "These actions can be bound to key events, fired from buttons, etc."
        };
        SimpleAttributeSet[] attrs = initAttributes(initString.length);
        try
        {
            for(int j = 0, k; j < initString.length; j++)
            {
                k = j < 5 ? j : 0;
                doc.insertString(doc.getLength(), initString[j] + "\n", attrs[k]);
            }
        }
        catch(BadLocationException ble)
        {
            System.err.println("init doc: " + ble.getMessage());
        }
    }
 
    private SimpleAttributeSet[] initAttributes(int length)
    {
        SimpleAttributeSet[] attrs = new SimpleAttributeSet[length];
        attrs[0] = new SimpleAttributeSet();
        StyleConstants.setFontFamily(attrs[0], "lucida bright regular");
        StyleConstants.setFontSize(attrs[0], 18);
 
        attrs[1] = new SimpleAttributeSet(attrs[0]);
        StyleConstants.setUnderline(attrs[1], true);
 
        attrs[2] = new SimpleAttributeSet(attrs[0]);
        StyleConstants.setBold(attrs[2], true);
 
        attrs[3] = new SimpleAttributeSet(attrs[0]);
        StyleConstants.setForeground(attrs[3], Color.red);
 
        attrs[4] = new SimpleAttributeSet(attrs[0]);
        StyleConstants.setItalic(attrs[4], true);
 
        return attrs;
    }
 
    public static void main(String[] args)
    {
        new TextTest();
    }
}
 
/**
 * click on document in JTextPane to get
 *     position in model - see Document api
 *     and (x,y) view location
 */
class PointSelector extends MouseAdapter
{
    TextTest textTest;
 
    public PointSelector(TextTest tt)
    {
        textTest = tt;
    }
 
    public void mousePressed(MouseEvent e)
    {
        textTest.findModelPosition(e.getPoint());
    }
}