Get the width of characters

Hello everyone,
I have a question and I hope to find anyone who can answer it :-)
I am developing a Midlet (MIDP 1.0 CDLC 1.0) for which I am implementing my own forms. That means that I do not use the ChoiceGroup class (for example ) which is provided but I implement my own one.
To do so I am extending the canvas class, print everything on screen with g.drawString(...) (where g is a Graphics object) and handle the user input on my own.
The problem is that I have to do word wraps on my own. What I know is the width of the canvas object, but I do not know how many pixel are needed for a character. (Actuelly it seems like different characters need different numbers of pixels). Is there any possibility to get this information or is there any other possibility to implement the word wraps?
Thank you,
kellergeist

Well, I found the methode
public int stringWidth(String str) but I am not sure whether I understand the description
http://j2medevices.com/documentation/midp1.0/javax/microedition/lcdui/Font.html#charWidth(char)
Dies that mean that stringWidth returns the amount of pixels which is needed by the String?

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Hi. Thanks for answering. I need the width because i want to set the format of the field at runtime. The quantity of decimal digits for all the numeric fieds in the report is received as a parameter.
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Ni_Min wrote:
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Hi there,
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Thank you and Happy New Year !

hi,
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hope this was useful
happy holidayz

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Hey
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veldhanas wrote:
Hi,
Use
setSize(PWIDTH, PHEIGHT); instead of
setPreferredSize( new Dimension(PWIDTH, PHEIGHT));ThanksWrong Wrong Wrong Wrong
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Hi all,
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Please note that I call resizeMessageListColumns() from the method to which the JScrollPane is returned.
*** Code that creates the JTable ***
* Insert the method's description here.
* Creation date: (8/17/2002 4:22:14 PM)
* @return javax.swing.JTable
public JTable createMessageList( String title )
     tableNames = setMessageListHeader(title);
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     dataModel = new MailTableModel(tableData,tableNames);
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    tableView = new JTable(dataModel);
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             if (value instanceof Color)
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                 setText(c.getRed() + ", " + c.getGreen() + ", " + c.getBlue());
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    tableView.setShowVerticalLines(false);
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     tableView.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
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}*** Resize the Rows ***
* Insert the method's description here.
* Creation date: (8/18/2002 11:50:48 AM)
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     int totalWidth = messageList.getViewport().getWidth();
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     int remainingWidth = totalWidth;
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     int[] finalWidths = new int[0];
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     final double[] INBOX_COLUMN_SIZES =          { 20, 20, 0.30, 0.50, 20, 0.10, 0.10 };
//                                                       {"Pr","Fg","Sender","Subject","At","Date","Size"};
     final double[] SENT_COLUMN_SIZES =          { 20, 0.30, 0.50, 20, 0.10, 0.10 };
//                                                       {"Pr","Recipient","Subject","At","Date","Size"};
     final double[] DELETE_COLUMN_SIZES =     { 20, 0.30, 0.50, 20, 0.10, 0.10 };
//                                                       {"Pr","Sender","Subject","At","Date","Size"};
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//                                                       {"Pr","Fg","Recipient","Subject","At","Date","Size"};
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//                                                       {"Pr","Fg","Sender","Subject","At","Date","Size"};
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     for (int i=0; i<numColumns; i++)
          if (INBOX_COLUMN_SIZES[i] < 1) // if this is an absolute size
               finalWidths[i] = (int)(INBOX_COLUMN_SIZES[i] * totalWidth);
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          finalWidths = new int[numColumns];
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          // this does not yet return the final size of each column
          // but only calculates the remaining width
          for (int i=0; i<numColumns; i++)
               if (INBOX_COLUMN_SIZES[i] >= 1) // if this is an absolute size
                    remainingWidth -= (int)INBOX_COLUMN_SIZES;
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          for (int i=0; i<numColumns; i++)
               if (i == (numColumns-1))
                    finalWidths[i] = remainingWidth;
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                    finalWidths[i] = (int)(INBOX_COLUMN_SIZES[i] * totalWidth);
                    remainingWidth -= (int)(INBOX_COLUMN_SIZES[i] * totalWidth);
     else if (currentNode.equals(SENT_TITLE))
          numColumns = SENT_COLUMN_SIZES.length;
          // array where final widths are stored
          finalWidths = new int[numColumns];
          // now, start determining the size of the columns
          // this does not yet return the final size of each column
          // but only calculates the remaining width
          for (int i=0; i<numColumns; i++)
               if (SENT_COLUMN_SIZES[i] >= 1) // if this is an absolute size
                    remainingWidth -= (int)SENT_COLUMN_SIZES[i];
                    finalWidths[i] = (int)SENT_COLUMN_SIZES[i];
          totalWidth = remainingWidth;
          // now calculate aboslute widths of relative widths
          for (int i=0; i<numColumns; i++)
               if (i == (numColumns-1))
                    finalWidths[i] = remainingWidth;
               else if (SENT_COLUMN_SIZES[i] < 1) // if this is an absolute size
                    finalWidths[i] = (int)(SENT_COLUMN_SIZES[i] * totalWidth);
                    remainingWidth -= (int)(SENT_COLUMN_SIZES[i] * totalWidth);
     else if (currentNode.equals(DELETE_TITLE))
          numColumns = DELETE_COLUMN_SIZES.length;
          // array where final widths are stored
          finalWidths = new int[numColumns];
          // now, start determining the size of the columns
          // this does not yet return the final size of each column
          // but only calculates the remaining width
          for (int i=0; i<numColumns; i++)
               if (DELETE_COLUMN_SIZES[i] >= 1) // if this is an absolute size
                    remainingWidth -= (int)DELETE_COLUMN_SIZES[i];
                    finalWidths[i] = (int)DELETE_COLUMN_SIZES[i];
          totalWidth = remainingWidth;
          // now calculate aboslute widths of relative widths
          for (int i=0; i<numColumns; i++)
               if (i == (numColumns-1))
                    finalWidths[i] = remainingWidth;
               else if (DELETE_COLUMN_SIZES[i] < 1) // if this is an absolute size
                    finalWidths[i] = (int)(DELETE_COLUMN_SIZES[i] * totalWidth);
                    remainingWidth -= (int)(DELETE_COLUMN_SIZES[i] * totalWidth);
     else if (currentNode.equals(DRAFT_TITLE))
          numColumns = DRAFT_COLUMN_SIZES.length;
          // array where final widths are stored
          finalWidths = new int[numColumns];
          // now, start determining the size of the columns
          // this does not yet return the final size of each column
          // but only calculates the remaining width
          for (int i=0; i<numColumns; i++)
               if (DRAFT_COLUMN_SIZES[i] >= 1) // if this is an absolute size
                    remainingWidth -= (int)DRAFT_COLUMN_SIZES[i];
                    finalWidths[i] = (int)DRAFT_COLUMN_SIZES[i];
          totalWidth = remainingWidth;
          // now calculate aboslute widths of relative widths
          for (int i=0; i<numColumns; i++)
               if (i == (numColumns-1))
                    finalWidths[i] = remainingWidth;
               else if (DRAFT_COLUMN_SIZES[i] < 1) // if this is an absolute size
                    finalWidths[i] = (int)(DRAFT_COLUMN_SIZES[i] * totalWidth);
                    remainingWidth -= (int)(DRAFT_COLUMN_SIZES[i] * totalWidth);
     else
          numColumns = DEFAULT_COLUMN_SIZES.length;
          // array where final widths are stored
          finalWidths = new int[numColumns];
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          // but only calculates the remaining width
          for (int i=0; i<numColumns; i++)
               if (DEFAULT_COLUMN_SIZES[i] >= 1) // if this is an absolute size
                    remainingWidth -= (int)DEFAULT_COLUMN_SIZES[i];
                    finalWidths[i] = (int)DEFAULT_COLUMN_SIZES[i];
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          // now calculate aboslute widths of relative widths
          for (int i=0; i<numColumns; i++)
               if (i == (numColumns-1))
                    finalWidths[i] = remainingWidth;
               else if (DEFAULT_COLUMN_SIZES[i] < 1) // if this is an absolute size
                    finalWidths[i] = (int)(DEFAULT_COLUMN_SIZES[i] * totalWidth);
                    remainingWidth -= (int)(DEFAULT_COLUMN_SIZES[i] * totalWidth);
     // set column widths
     for (int i=0; i<numColumns; i++)
          tableView.getColumnModel().getColumn(i).setMinWidth(finalWidths[i]);
          tableView.getColumnModel().getColumn(i).setPreferredWidth(finalWidths[i]);
          tableView.getColumnModel().getColumn(i).setMaxWidth(finalWidths[i]);
//     tableView.repaint();

Hi,
I solved the second problem. All I did was change the autoresize to      setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);.
However, I still have the first problem.
Thanks for your help in advance.

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import java.awt.*;                  //for the awt widgets
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    private JComboBox shapeColorDrop, fontTypeDrop, fontColorDrop;
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        int yRow1 = 10;     //the shape rows
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        shapeRadio.add(rect);
        shapeRadio.add(oval);
        shapeRadio.add(roundRect);
        entryPanel.add(rect);
        entryPanel.add(oval);
        entryPanel.add(roundRect);
        shapeColorDrop = new JComboBox(colors);
        shapeColorDrop.setBounds(rjX, yRow3, dWidth, height);
        shapeColorDrop.addFocusListener(new focusListen());
        entryPanel.add(shapeColorDrop);
        //the fourth row (labels)
        JLabel xShapeLabel = new JLabel("Enter Width:");
        xShapeLabel.setBounds(ljX, yRow4, mWidth, height);
        entryPanel.add(xShapeLabel);
        JLabel yShapeLabel = new JLabel("Enter Height:");
        yShapeLabel.setBounds(rjX, yRow4, mWidth, height);
        entryPanel.add(yShapeLabel);
        //the fifth row (entry)
        xShapeText = new JTextField("200", 3);
        xShapeText.setBounds(ljX, yRow5, tWidth, height);
        xShapeText.addFocusListener(new focusListen());
        entryPanel.add(xShapeText);
        yShapeText = new JTextField("200", 3);
        yShapeText.setBounds(rjX, yRow5, tWidth, height);
        yShapeText.addFocusListener(new focusListen());
        entryPanel.add(yShapeText);
        //the sixth row (label)
        JLabel messageLabel = new JLabel("Enter Message Parameters:");
        messageLabel.setBounds(ljX, yRow6, bmWidth, height);
        entryPanel.add(messageLabel);
        //the seventh row (labels)
        JLabel messageEntryLabel= new JLabel("Enter Message:");
        messageEntryLabel.setBounds(ljX, yRow7, mWidth, height);
        entryPanel.add(messageEntryLabel);
        //the eighth row (entry)
        messageText = new JTextField("Enter your message here.");
        messageText.setBounds(ljX, yRow8, mWidth, height);
        messageText.addFocusListener(new focusListen());
        entryPanel.add(messageText);
        //the ninth row (label)
        JLabel fontTypeLabel = new JLabel("Select Font:");
        fontTypeLabel.setBounds(ljX, yRow9, mWidth, height);
        entryPanel.add(fontTypeLabel);
        JLabel fontColorLabel = new JLabel("Select Font Color:");
        fontColorLabel.setBounds(rjX, yRow9, mWidth, height);
        entryPanel.add(fontColorLabel);
        //the tenth row (entry)
        fontTypeDrop = new JComboBox(fonts);
        fontTypeDrop.setBounds(ljX, yRow10, dWidth, height);
        fontTypeDrop.addFocusListener(new focusListen());
        entryPanel.add(fontTypeDrop);
        fontColorDrop = new JComboBox(colors);
        fontColorDrop.setBounds(rjX, yRow10, dWidth, height);
        fontColorDrop.addFocusListener(new focusListen());
        entryPanel.add(fontColorDrop);
        //the eleventh row (label)
        JLabel fontSizeLabel = new JLabel("Select Font Size:");
        fontSizeLabel.setBounds(ljX, yRow11, mWidth, height);
        entryPanel.add(fontSizeLabel);
        //the final row (entry)
        fontSizeText = new JTextField("12", 2);
        fontSizeText.setBounds(ljX, yRow12, tWidth, height);
        fontSizeText.addFocusListener(new focusListen());
        entryPanel.add(fontSizeText);
        //display panel code
        //use test parameters
        //these will later be retrieved from the entries
        drawCanvas.setParams("Hello", "roundRect", Color.red,
                            100, 100, "Serif", Color.black, 12);
        //set the applet to visible
        //set to visible and display
        entire.setSize(800, 600);
        entire.setVisible(true);
    }   //end the init method
    //declare an inner class to handle events
    private class focusListen implements FocusListener
        //supply the implementation of the actionPerformed method
        //pass an event variable as the argument
        public void focusLost(FocusEvent e)
        { JOptionPane.showMessageDialog(null, "Focus lost."); }
        //declare an empty focus gained function
        public void focusGained(FocusEvent e) {}
    }   //end testListen class
}   //end DemoShape class

Sorry for glossing over your code sample, particularly as it looks like one of the best I've seen so far on the forums, but I'm pretty sure the answer you are looking for is as follows:
Java doesn't render a component until paint() is called so until then you are not going to have any size settings because the jvm simply doesn't know how big the visual component is. This makes sense when you think about what the jvm is doing. The layout manager controls the display of the components depending on the settings it is supplied. So until it knows how many components you want, where, what kind of spacing, etc, etc, etc, how can the size be determined.
The true cycle of events is therefore:
create an instance of DisplayCanvas,
add it to your container,
make the container visible (which renders the component),
get the size of the DisplayCanvas instance.
You are being hampered because your desired chain of events is:
create an instance of DisplayCanvas,
get the size of the DisplayCanvas instance,
add it to your container,
make the container visible.
This state of affairs is highly annoying and then leads to the next question "what do we do about that?". There is a cunning trick which is to get the jvm to render the component to an off-screen image, thus calculating the dimensions of the component so that you can do precisely the kind of enquiry on the object that you have been looking for. It should be noted that this may not be the visual size for all the reasons given above, but it is the "preferred size" for the component. Check the Swing tutorials and have a look at the section on Layout Managers for a run down on what that means.
Anyway, we can use this handy code sample to determine the preferred size for your component. Notice the call to "paint()" (normally you would never make a direct call to paint() in swing) and the "g.dispose()" to free resources:
package com.coda.swing.desktool.gui;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
public class PaintUtil
     public PaintUtil()
          super();
     public static Component paintBuffer(Component comp)
          Dimension size = comp.getPreferredSize();
          comp.setSize(size);
          BufferedImage img = new BufferedImage(size.width, size.height, BufferedImage.TYPE_INT_ARGB);
          Graphics2D g2 = img.createGraphics();
          comp.paint(g2);
          g2.dispose();
          return comp;
}Before you make a call to getWidth() or getHeight() put in a call to "PaintUtil.paintBuffer(this);" and see what happens.
By the way, I can't claim credit for this code ... and I really wish I could remember where I got it from myself so I can thank them :)

Finding the width of a JPEG loaded into a movie clip

I will be loading a page of bio information. Next to the
person's photo (photos will vary in width) I want to put a column
of buttons about 20 pixels to the right of the photo. So after I
load the photo into an empty movie clip, I'm trying to get the
width of the photo in order to figure out the x position of the
buttons next to it. Here is what I have:
myImage = "images/" + _level0.images[link];
loadMovie(myImage,image_mc);
// JPEG loads okay into image_mc //
trace("image_mc._x = " + image_mc._x);
// I get "Image_mc._x = 393" as expected //
trace("myImage._width = " + myImage._width);
// I get "image_mc._width = undefined" //
trace("image_mc._width = " + image_mc._width);
// I get "image_mc._width = 0" //
How do I find the width of the loaded JPEG?

you are probably trying to get the width before the image has
loaded completely.. use the MovieClipLoader class to load the image
into the empty movie clip, then use the onLoadInit event to get the
movie clips's width(which is the images width);
var mcLoader:MovieClipLoader = new MovieClipLoader();
var myListener:Object = new Object();
myListener.onLoadInit = function(target:MovieClip):Void{
trace(image_mc._width);
mcLoader.addListener(myListener);
mcLoader.loadClip(myImage, image_mc);

How do i get the last 4 chars

String FileE = myFile.getName();
This gives me a file name but how do I a reverse trim and get the last 4 chars??

Hi
What are you trying to achieve here, why are you pulling a file into a String Buffer ?
fileName.getName() will output a string, you can use the following statement to get the last four characters of the filename
Here is an example
String fileName = "testfile";
String lastFourChars = fileName.substring(fileName.length()-4);
This will give you the last four characters of the filename.
But if you are trying to get the extension of the file
Do this
String extension = fileName.substring(fileName.lastIndexOf("."));
Thanks
Swaraj
Thanks
Swaraj

Get the width of characters

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