FontViewer.java

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// (C) 2003 by Dominique Unruh. GPL

import javax.swing.*;
import java.awt.*;
import javax.swing.text.*;

public class FontViewer extends JFrame {
    final static int FONTSIZE = 18;
    final static String EXAMPLE_STRING = "aA äÄ щЩ γΓ ש ดี 本 は 한 ≠ ⠃⠗⠇";
    final static int UNICODE_MAX = 0xFFFF;

    JTextPane pane = null;

    public FontViewer() {
        init(800,600);
    }

    public FontViewer(int width, int height) {
        init(width,height);
    }

    private void init(int width, int height) {
        setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
        setTitle("Font Viewer");
        pane = new JTextPane();
        JScrollPane scroll = new JScrollPane();
        scroll.setViewportView(pane);
        pane.setEditable(false);
        getContentPane().add(scroll);
        setSize(width,height);
        setVisible(true);
        pane.requestFocus();
    }

    public void showSample(String text) {
        if (text==null || text.length()==0) text = EXAMPLE_STRING;
        addFonts(text);
        pane.setCaretPosition(0);
    };

    void showFont(String fontName) {
        Font font = new Font(fontName,Font.PLAIN,FONTSIZE);
        SimpleAttributeSet defaultStyle = new SimpleAttributeSet();
        StyleConstants.setFontSize(defaultStyle,FONTSIZE);
        SimpleAttributeSet underlinedStyle =
            new SimpleAttributeSet(defaultStyle);
        StyleConstants.setUnderline(underlinedStyle,true);
        SimpleAttributeSet fontStyle = new SimpleAttributeSet(defaultStyle);
        StyleConstants.setFontFamily(fontStyle,fontName);
        Document doc = pane.getDocument();

        try {
            doc.insertString(doc.getLength(),"Repertoire of ",defaultStyle);
            doc.insertString(doc.getLength(),fontName,underlinedStyle);
            doc.insertString
                (doc.getLength()," upto Unicode code position 0x"+
                 Integer.toString(UNICODE_MAX,16).toUpperCase()+":\n\n",
                 defaultStyle);
        } catch (BadLocationException e) {};

        int blockStart = 32;
        StringBuffer block = new StringBuffer();
        for (int i=blockStart; i<UNICODE_MAX; i++) {
            if (Character.getType((char)i)!=Character.CONTROL)
                block.append((char)i);
            if ((i+1)%0x20==0 || i>=UNICODE_MAX) {
                String blockStr = block.toString();
                if (font.canDisplayUpTo(blockStr)!=0 && blockStr.length()!=0) {
                    try {
                        doc.insertString(doc.getLength(),
                                         Integer.toString(blockStart,16).
                                         toUpperCase()+": ",
                                         defaultStyle);
                        doc.insertString(doc.getLength(),
                                         "\u202D"+blockStr+"\u202C\n",
                                         fontStyle);
                    } catch (BadLocationException e) {};
                }
                block.setLength(0); blockStart = i+1;
            }
        }
        pane.setCaretPosition(0);
    }

    void addFonts(String text) {
        String fonts[] = GraphicsEnvironment.getLocalGraphicsEnvironment().
            getAvailableFontFamilyNames();
        int fontQual[] = new int[fonts.length];
        Document doc = pane.getDocument();
        SimpleAttributeSet defaultStyle = new SimpleAttributeSet();
        StyleConstants.setFontSize(defaultStyle,FONTSIZE);
        SimpleAttributeSet underlinedStyle =
            new SimpleAttributeSet(defaultStyle);
        StyleConstants.setUnderline(underlinedStyle,true);
        SimpleAttributeSet boldStyle = new SimpleAttributeSet(defaultStyle);
        StyleConstants.setBold(boldStyle,true);
        int maxQual = 0, possibleQual = 0;
        for (int i=0; i<fonts.length; i++) {
            int qual = 0; possibleQual = 0;
            Font font = new Font(fonts[i],Font.PLAIN,FONTSIZE);
            for (int j=0; j<text.length(); j++) {
                char c = text.charAt(j);
                if (c!=' ' && c!='\t' && c!='\n') {
                    possibleQual++;
                    if (font.canDisplay(c)) { 
                        qual++;
                    }}};
            fontQual[i] = qual;
            if (maxQual < qual) maxQual = qual;
        }

        while (maxQual>0) {
            int newMaxQual = 0;
            String info = 
                "Fonts displaying "+
                ((maxQual==possibleQual)?"all":""+maxQual)+
                ((maxQual==1 && maxQual!=possibleQual)?
                 " character":" characters")+
                ":\n";
            try {
                doc.insertString(doc.getLength(),info,underlinedStyle);
            } catch (BadLocationException e) {};
            
            for (int i=0; i<fonts.length; i++) {
                String name = fonts[i];
                if (name==null) continue;
                if (fontQual[i]<maxQual) {
                    if (fontQual[i]>newMaxQual) newMaxQual = fontQual[i];
                    continue;
                }
                fonts[i] = null;
                
                try {
                    doc.insertString(doc.getLength(), 
                                     ((name.length()==0)?"<empty>":name)+": ", 
                                     boldStyle);
                    SimpleAttributeSet fontStyle = 
                        new SimpleAttributeSet(defaultStyle);
                    StyleConstants.setFontFamily(fontStyle,name);
                    doc.insertString(doc.getLength(), text, fontStyle);
                    doc.insertString(doc.getLength(), "\n", defaultStyle);
                } catch (BadLocationException e) {
                    e.printStackTrace();
                }
            }
            maxQual = newMaxQual;
            try {
                doc.insertString(doc.getLength(), "\n", defaultStyle);
            } catch (BadLocationException e) {};
        }

        StringBuffer rest = new StringBuffer();
        int numRest = 0;
        for (int i=0; i<fonts.length; i++) {
            String name = fonts[i];
            if (name==null) continue;
            if (numRest!=0) rest.append(", ");
            rest.append(name);
            numRest++;
        }
            
        try {
            if (numRest>0) {
                doc.insertString(doc.getLength(),
                                 "Font"+((numRest>1)?"s":"")+
                                 " displaying nothing at all:\n",
                                 underlinedStyle);
                doc.insertString(doc.getLength(),rest.toString(),
                                 boldStyle);
            }
        } catch (BadLocationException e) {};
        
    }

    public static void main(String args[]) {
        StringBuffer arg = new StringBuffer();
        for (int i=0; i<args.length; i++) {
            if (i>0) arg.append(" ");
            arg.append(args[i]);
        }
        FontViewer fv = new FontViewer();
        //fv.showSample(arg.toString());
        fv.showFont(arg.toString());
    }
}

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