Use a scaled font within Styled JTextPane

From: SPG (steve.goodsell_at_nopoo.blueyonder.co.uk)
Date: 03/25/05 

Date: Fri, 25 Mar 2005 08:24:34 GMT

Hi,

I want to be able to resize a font that is used within my styled JTextPane
so that it grows both horizontally and vertically when the form resizes.
I have the code to rescale the font (posted below), and that can be applied
to a label which works fine.

What I want to do is set this newly rescaled font as the font for the styled
JTextPane, but I cannot seem to make it work.
I have tried setting the font using textPane.setFont(), I have also tried
resetting the styles but there is only a fotnSize atrribute not a specific
method for setting the real font to be used for a style..

>From the code below, assume that handleResize() is called from a component
listener - when the component resizes. This is definitely being called.
Assume also that addStyles() is using a JTextPane set as a class level var,
as is the _font.

The rescale appears to work for the label but not the text pane.
Any ideas,

Steve

private void handleResize(){
        Rectangle bounds = _textPane.getBounds();
        try{
            String line = "";
            for(int i=0; i< 80; i++){
                line+="X";
            }

            Graphics g = this.getGraphics();
            FontMetrics fm = g.getFontMetrics(_font);
            int strWidth = fm.stringWidth(line);
            int strHeight = fm.getHeight();
            int gridHeight = strHeight * 25;

            //Now try and work out the scaling!!!
            int componentYRange = bounds.height - bounds.y;
            int componentXRange = bounds.width - bounds.x;
            double scaleXFactor = (double) componentXRange / strWidth;
            double scaleYFactor = (double) componentYRange / gridHeight;

            AffineTransform fontTransform = new AffineTransform();
            fontTransform.scale(scaleXFactor, scaleYFactor);

            //New Scaled Font
            _font = _font.deriveFont(fontTransform);
            System.out.println(_font.getSize() + "("+scaleXFactor + ", " +
scaleYFactor+")");

            Style s = _textPane.getStyle("regular");
            StyleConstants.setForeground(s, new
Color((int)(Math.random()*255),
(int)(Math.random()*255),(int)(Math.random()*255) ));
            _testLabel.setFont(_font); //WORKS FINE
            _textPane.setFont(_font); //DOES NTO DO ANYTHING
            //reapplyStyles(_textPane,s);

        }catch(Exception err){
            System.out.println(err.getMessage());
            err.printStackTrace();
        }
    }

protected void addStylesToDocument(StyledDocument doc) {
        //Initialize some styles.
        ChangeListener changeListener = new ChangeListener() {
            public void stateChanged(ChangeEvent e) {
                System.out.println("STYLE CHANGED!");
                reapplyStyles(_textPane, (Style)e.getSource());
            }
        };

        _textPane.setFont(_font);

        Style regular = doc.addStyle("regular", null);
        //StyleConstants.setFontFamily(regular, _font.getFamily());
        //StyleConstants.setFontSize(regular, _font.getSize());
        StyleConstants.setForeground(regular, Color.GREEN);
        StyleConstants.setBackground(regular, Color.BLACK);
        regular.addChangeListener(changeListener);

        Style s = doc.addStyle("italic", null);
        s.addAttributes(regular);
        StyleConstants.setItalic(s, true);
        s.addChangeListener(changeListener);

        s = doc.addStyle("bold", null);
        s.addAttributes(regular);
        StyleConstants.setBold(s, true);
        s.addChangeListener(changeListener);

        s = doc.addStyle("underline", null);
        s.addAttributes(regular);
        StyleConstants.setUnderline(s, true);
        s.addChangeListener(changeListener);
    }

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