barcode128.java

一个java操作pdf文件的开发包,很好用的.

        int c = 0;
        for (int k = 0; k < tLen; ++k) {
            c = text.charAt(k);
            if (c > 127)
                throw new RuntimeException("There are illegal characters for barcode 128 in '" + text + "'.");
        }
        c = text.charAt(0);
        char currentCode = START_B;
        int index = 0;
        if (isNextDigits(text, index, 2)) {
            currentCode = START_C;
            out += currentCode;
            if (ucc)
                out += FNC1;
            out += getPackedRawDigits(text, index, 2);
            index += 2;
        }
        else if (c < ' ') {
            currentCode = START_A;
            out += currentCode;
            if (ucc)
                out += FNC1;
            out += (char)(c + 64);
            ++index;
        }
        else {
            out += currentCode;
            if (ucc)
                out += FNC1;
            out += (char)(c - ' ');
            ++index;
        }
        while (index < tLen) {
            switch (currentCode) {
                case START_A:
                    {
                        if (isNextDigits(text, index, 4)) {
                            currentCode = START_C;
                            out += CODE_AB_TO_C;
                            out += getPackedRawDigits(text, index, 4);
                            index += 4;
                        }
                        else {
                            c = text.charAt(index++);
                            if (c > '_') {
                                currentCode = START_B;
                                out += CODE_AC_TO_B;
                                out += (char)(c - ' ');
                            }
                            else if (c < ' ')
                                out += (char)(c + 64);
                            else
                                out += (char)(c - ' ');
                        }
                    }
                    break;
                case START_B:
                    {
                        if (isNextDigits(text, index, 4)) {
                            currentCode = START_C;
                            out += CODE_AB_TO_C;
                            out += getPackedRawDigits(text, index, 4);
                            index += 4;
                        }
                        else {
                            c = text.charAt(index++);
                            if (c < ' ') {
                                currentCode = START_A;
                                out += CODE_BC_TO_A;
                                out += (char)(c + 64);
                            }
                            else {
                                out += (char)(c - ' ');
                            }
                        }
                    }
                    break;
                case START_C:
                    {
                        if (isNextDigits(text, index, 2)) {
                            out += getPackedRawDigits(text, index, 2);
                            index += 2;
                        }
                        else {
                            c = text.charAt(index++);
                            if (c < ' ') {
                                currentCode = START_A;
                                out += CODE_BC_TO_A;
                                out += (char)(c + 64);
                            }
                            else {
                                currentCode = START_B;
                                out += CODE_AC_TO_B;
                                out += (char)(c - ' ');
                            }
                        }
                    }
                    break;
            }
        }
        return out;
    }
    
    /** Generates the bars. The input has the actual barcodes, not
     * the human readable text.
     * @param text the barcode
     * @return the bars
     */    
    public static byte[] getBarsCode128Raw(String text) {
        int idx = text.indexOf('\uffff');
        if (idx >= 0)
            text = text.substring(0, idx);
        int chk = text.charAt(0);
        for (int k = 1; k < text.length(); ++k)
            chk += k * text.charAt(k);
        chk = chk % 103;
        text += (char)chk;
        byte bars[] = new byte[(text.length() + 1) * 6 + 7];
        int k;
        for (k = 0; k < text.length(); ++k)
            System.arraycopy(BARS[text.charAt(k)], 0, bars, k * 6, 6);
        System.arraycopy(BARS_STOP, 0, bars, k * 6, 7);
        return bars;
    }
    
    /** Gets the maximum area that the barcode and the text, if
     * any, will occupy. The lower left corner is always (0, 0).
     * @return the size the barcode occupies.
     */
    public Rectangle getBarcodeSize() {
        float fontX = 0;
        float fontY = 0;
        String fullCode;
        if (font != null) {
            if (baseline > 0)
                fontY = baseline - font.getFontDescriptor(BaseFont.DESCENT, size);
            else
                fontY = -baseline + size;
            fullCode = code;
            if (codeType == CODE128_RAW) {
                int idx = code.indexOf('\uffff');
                if (idx < 0)
                    fullCode = "";
                else
                    fullCode = code.substring(idx + 1);
            }
            fontX = font.getWidthPoint(fullCode, size);
        }
        if (codeType == CODE128_RAW) {
            int idx = code.indexOf('\uffff');
            if (idx >= 0)
                fullCode = code.substring(0, idx);
            else
                fullCode = code;
        }
        else {
            fullCode = getRawText(code, codeType == CODE128_UCC);
        }
        int len = fullCode.length();
        float fullWidth = (len + 2) * 11 * x + 2 * x;
        fullWidth = Math.max(fullWidth, fontX);
        float fullHeight = barHeight + fontY;
        return new Rectangle(fullWidth, fullHeight);
    }
    
    /** Places the barcode in a <CODE>PdfContentByte</CODE>. The
     * barcode is always placed at coodinates (0, 0). Use the
     * translation matrix to move it elsewhere.<p>
     * The bars and text are written in the following colors:<p>
     * <P><TABLE BORDER=1>
     * <TR>
     *   <TH><P><CODE>barColor</CODE></TH>
     *   <TH><P><CODE>textColor</CODE></TH>
     *   <TH><P>Result</TH>
     *   </TR>
     * <TR>
     *   <TD><P><CODE>null</CODE></TD>
     *   <TD><P><CODE>null</CODE></TD>
     *   <TD><P>bars and text painted with current fill color</TD>
     *   </TR>
     * <TR>
     *   <TD><P><CODE>barColor</CODE></TD>
     *   <TD><P><CODE>null</CODE></TD>
     *   <TD><P>bars and text painted with <CODE>barColor</CODE></TD>
     *   </TR>
     * <TR>
     *   <TD><P><CODE>null</CODE></TD>
     *   <TD><P><CODE>textColor</CODE></TD>
     *   <TD><P>bars painted with current color<br>text painted with <CODE>textColor</CODE></TD>
     *   </TR>
     * <TR>
     *   <TD><P><CODE>barColor</CODE></TD>
     *   <TD><P><CODE>textColor</CODE></TD>
     *   <TD><P>bars painted with <CODE>barColor</CODE><br>text painted with <CODE>textColor</CODE></TD>
     *   </TR>
     * </TABLE>
     * @param cb the <CODE>PdfContentByte</CODE> where the barcode will be placed
     * @param barColor the color of the bars. It can be <CODE>null</CODE>
     * @param textColor the color of the text. It can be <CODE>null</CODE>
     * @return the dimensions the barcode occupies
     */
    public Rectangle placeBarcode(PdfContentByte cb, Color barColor, Color textColor) {
        String fullCode = code;
        if (codeType == CODE128_RAW) {
            int idx = code.indexOf('\uffff');
            if (idx < 0)
                fullCode = "";
            else
                fullCode = code.substring(idx + 1);
        }
        float fontX = 0;
        if (font != null) {
            fontX = font.getWidthPoint(fullCode, size);
        }
        String bCode;
        if (codeType == CODE128_RAW) {
            int idx = code.indexOf('\uffff');
            if (idx >= 0)
                bCode = code.substring(0, idx);
            else
                bCode = code;
        }
        else {
            bCode = getRawText(code, codeType == CODE128_UCC);
        }
        int len = bCode.length();
        float fullWidth = (len + 2) * 11 * x + 2 * x;
        float barStartX = 0;
        float textStartX = 0;
        switch (textAlignment) {
            case Element.ALIGN_LEFT:
                break;
            case Element.ALIGN_RIGHT:
                if (fontX > fullWidth)
                    barStartX = fontX - fullWidth;
                else
                    textStartX = fullWidth - fontX;
                break;
            default:
                if (fontX > fullWidth)
                    barStartX = (fontX - fullWidth) / 2;
                else
                    textStartX = (fullWidth - fontX) / 2;
                break;
        }
        float barStartY = 0;
        float textStartY = 0;
        if (font != null) {
            if (baseline <= 0)
                textStartY = barHeight - baseline;
            else {
                textStartY = -font.getFontDescriptor(BaseFont.DESCENT, size);
                barStartY = textStartY + baseline;
            }
        }
        byte bars[] = getBarsCode128Raw(bCode);
        boolean print = true;
        if (barColor != null)
            cb.setColorFill(barColor);
        for (int k = 0; k < bars.length; ++k) {
            float w = bars[k] * x;
            if (print)
                cb.rectangle(barStartX, barStartY, w, barHeight);
            print = !print;
            barStartX += w;
        }
        cb.fill();
        if (font != null) {
            if (textColor != null)
                cb.setColorFill(textColor);
            cb.beginText();
            cb.setFontAndSize(font, size);
            cb.setTextMatrix(textStartX, textStartY);
            cb.showText(fullCode);
            cb.endText();
        }
        return getBarcodeSize();
    }    
}