documentfont.java

iText是一个能够快速产生PDF文件的java类库。iText的java类对于那些要产生包含文本

                }
            }
        }
        PdfArray newWidths = (PdfArray)PdfReader.getPdfObject(font.get(PdfName.WIDTHS));
        PdfNumber first = (PdfNumber)PdfReader.getPdfObject(font.get(PdfName.FIRSTCHAR));
        PdfNumber last = (PdfNumber)PdfReader.getPdfObject(font.get(PdfName.LASTCHAR));
        if (BuiltinFonts14.containsKey(fontName)) {
            BaseFont bf;
            try {
                bf = BaseFont.createFont(fontName, WINANSI, false);
            }
            catch (Exception e) {
                throw new ExceptionConverter(e);
            }
            int e[] = uni2byte.toOrderedKeys();
            for (int k = 0; k < e.length; ++k) {
                int n = uni2byte.get(e[k]);
                widths[n] = bf.getRawWidth(n, GlyphList.unicodeToName(e[k]));
            }
            Ascender = bf.getFontDescriptor(ASCENT, 1000);
            CapHeight = bf.getFontDescriptor(CAPHEIGHT, 1000);
            Descender = bf.getFontDescriptor(DESCENT, 1000);
            ItalicAngle = bf.getFontDescriptor(ITALICANGLE, 1000);
            llx = bf.getFontDescriptor(BBOXLLX, 1000);
            lly = bf.getFontDescriptor(BBOXLLY, 1000);
            urx = bf.getFontDescriptor(BBOXURX, 1000);
            ury = bf.getFontDescriptor(BBOXURY, 1000);
        }
        if (first != null && last != null && newWidths != null) {
            int f = first.intValue();
            ArrayList ar = newWidths.getArrayList();
            for (int k = 0; k < ar.size(); ++k) {
                widths[f + k] = ((PdfNumber)ar.get(k)).intValue();
            }
        }
        fillFontDesc((PdfDictionary)PdfReader.getPdfObject(font.get(PdfName.FONTDESCRIPTOR)));
    }
    
    private void fillFontDesc(PdfDictionary fontDesc) {
        if (fontDesc == null)
            return;
        PdfNumber v = (PdfNumber)PdfReader.getPdfObject(fontDesc.get(PdfName.ASCENT));
        if (v != null)
            Ascender = v.floatValue();
        v = (PdfNumber)PdfReader.getPdfObject(fontDesc.get(PdfName.CAPHEIGHT));
        if (v != null)
            CapHeight = v.floatValue();
        v = (PdfNumber)PdfReader.getPdfObject(fontDesc.get(PdfName.DESCENT));
        if (v != null)
            Descender = v.floatValue();
        v = (PdfNumber)PdfReader.getPdfObject(fontDesc.get(PdfName.ITALICANGLE));
        if (v != null)
            ItalicAngle = v.floatValue();
        PdfArray bbox = (PdfArray)PdfReader.getPdfObject(fontDesc.get(PdfName.FONTBBOX));
        if (bbox != null) {
            ArrayList ar = bbox.getArrayList();
            llx = ((PdfNumber)ar.get(0)).floatValue();
            lly = ((PdfNumber)ar.get(1)).floatValue();
            urx = ((PdfNumber)ar.get(2)).floatValue();
            ury = ((PdfNumber)ar.get(3)).floatValue();
            if (llx > urx) {
                float t = llx;
                llx = urx;
                urx = t;
            }
            if (lly > ury) {
                float t = lly;
                lly = ury;
                ury = t;
            }
        }
    }
    
    private void fillEncoding(PdfName encoding) {
        if (PdfName.MAC_ROMAN_ENCODING.equals(encoding) || PdfName.WIN_ANSI_ENCODING.equals(encoding)) {
            byte b[] = new byte[256];
            for (int k = 0; k < 256; ++k)
                b[k] = (byte)k;
            String enc = WINANSI;
            if (PdfName.MAC_ROMAN_ENCODING.equals(encoding))
                enc = MACROMAN;
            String cv = PdfEncodings.convertToString(b, enc);
            char arr[] = cv.toCharArray();
            for (int k = 0; k < 256; ++k)
                uni2byte.put(arr[k], k);
        }
        else {
            for (int k = 0; k < 256; ++k)
                uni2byte.put(stdEnc[k], k);
        }
    }
    
    /** Gets the family name of the font. If it is a True Type font
     * each array element will have {Platform ID, Platform Encoding ID,
     * Language ID, font name}. The interpretation of this values can be
     * found in the Open Type specification, chapter 2, in the 'name' table.<br>
     * For the other fonts the array has a single element with {"", "", "",
     * font name}.
     * @return the family name of the font
     *
     */
    public String[][] getFamilyFontName() {
        return null;
    }
    
    /** Gets the font parameter identified by <CODE>key</CODE>. Valid values
     * for <CODE>key</CODE> are <CODE>ASCENT</CODE>, <CODE>CAPHEIGHT</CODE>, <CODE>DESCENT</CODE>,
     * <CODE>ITALICANGLE</CODE>, <CODE>BBOXLLX</CODE>, <CODE>BBOXLLY</CODE>, <CODE>BBOXURX</CODE>
     * and <CODE>BBOXURY</CODE>.
     * @param key the parameter to be extracted
     * @param fontSize the font size in points
     * @return the parameter in points
     *
     */
    public float getFontDescriptor(int key, float fontSize) {
        if (cjkMirror != null)
            return cjkMirror.getFontDescriptor(key, fontSize);
        switch (key) {
            case AWT_ASCENT:
            case ASCENT:
                return Ascender * fontSize / 1000;
            case CAPHEIGHT:
                return CapHeight * fontSize / 1000;
            case AWT_DESCENT:
            case DESCENT:
                return Descender * fontSize / 1000;
            case ITALICANGLE:
                return ItalicAngle;
            case BBOXLLX:
                return llx * fontSize / 1000;
            case BBOXLLY:
                return lly * fontSize / 1000;
            case BBOXURX:
                return urx * fontSize / 1000;
            case BBOXURY:
                return ury * fontSize / 1000;
            case AWT_LEADING:
                return 0;
            case AWT_MAXADVANCE:
                return (urx - llx) * fontSize / 1000;
        }
        return 0;
    }
    
    /** Gets the full name of the font. If it is a True Type font
     * each array element will have {Platform ID, Platform Encoding ID,
     * Language ID, font name}. The interpretation of this values can be
     * found in the Open Type specification, chapter 2, in the 'name' table.<br>
     * For the other fonts the array has a single element with {"", "", "",
     * font name}.
     * @return the full name of the font
     *
     */
    public String[][] getFullFontName() {
        return null;
    }
    
    /** Gets the kerning between two Unicode chars.
     * @param char1 the first char
     * @param char2 the second char
     * @return the kerning to be applied
     *
     */
    public int getKerning(char char1, char char2) {
        return 0;
    }
    
    /** Gets the postscript font name.
     * @return the postscript font name
     *
     */
    public String getPostscriptFontName() {
        return fontName;
    }
    
    /** Gets the width from the font according to the Unicode char <CODE>c</CODE>
     * or the <CODE>name</CODE>. If the <CODE>name</CODE> is null it's a symbolic font.
     * @param c the unicode char
     * @param name the glyph name
     * @return the width of the char
     *
     */
    int getRawWidth(int c, String name) {
        return 0;
    }
    
    /** Checks if the font has any kerning pairs.
     * @return <CODE>true</CODE> if the font has any kerning pairs
     *
     */
    public boolean hasKernPairs() {
        return false;
    }
    
    /** Outputs to the writer the font dictionaries and streams.
     * @param writer the writer for this document
     * @param ref the font indirect reference
     * @param params several parameters that depend on the font type
     * @throws IOException on error
     * @throws DocumentException error in generating the object
     *
     */
    void writeFont(PdfWriter writer, PdfIndirectReference ref, Object[] params) throws DocumentException, IOException {
    }

    public int getWidth(String text) {
        if (cjkMirror != null)
            return cjkMirror.getWidth(text);
        else if (isType0) {
            char[] chars = text.toCharArray();
            int len = chars.length;
            int total = 0;
            for (int k = 0; k < len; ++k) {
                int[] ws = (int[])metrics.get(new Integer((int)chars[k]));
                if (ws != null)
                    total += ws[1];
            }
            return total;
        }
        else
            return super.getWidth(text);
    }
    
    byte[] convertToBytes(String text) {
        if (cjkMirror != null)
            return PdfEncodings.convertToBytes(text, CJKFont.CJK_ENCODING);
        else if (isType0) {
            char[] chars = text.toCharArray();
            int len = chars.length;
            byte[] b = new byte[len * 2];
            int bptr = 0;
            for (int k = 0; k < len; ++k) {
                int[] ws = (int[])metrics.get(new Integer((int)chars[k]));
                if (ws != null) {
                    int g = ws[0];
                    b[bptr++] = (byte)(g / 256);
                    b[bptr++] = (byte)(g);
                }
            }
            if (bptr == b.length)
                return b;
            else {
                byte[] nb = new byte[bptr];
                System.arraycopy(b, 0, nb, 0, bptr);
                return nb;
            }
        }
        else {
            char cc[] = text.toCharArray();
            byte b[] = new byte[cc.length];
            int ptr = 0;
            for (int k = 0; k < cc.length; ++k) {
                if (uni2byte.containsKey(cc[k]))
                    b[ptr++] = (byte)uni2byte.get(cc[k]);
            }
            if (ptr == b.length)
                return b;
            else {
                byte[] b2 = new byte[ptr];
                System.arraycopy(b, 0, b2, 0, ptr);
                return b2;
            }
        }
    }
    
    PdfIndirectReference getIndirectReference() {
        return refFont;
    }
    
    public boolean charExists(char c) {
        if (cjkMirror != null)
            return cjkMirror.charExists(c);
        else if (isType0) {
            return metrics.containsKey(new Integer((int)c));
        }
        else
            return super.charExists(c);
    }
    
    /**
     * Sets the font name that will appear in the pdf font dictionary.
     * It does nothing in this case as the font is already in the document.
     * @param name the new font name
     */    
    public void setPostscriptFontName(String name) {
    }
    
    public boolean setKerning(char char1, char char2, int kern) {
        return false;
    }
    
    public int[] getCharBBox(char c) {
        return null;
    }
    
    protected int[] getRawCharBBox(int c, String name) {
        return null;
    }
}