pdfdocument.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

            newline=true;
        }
        
        // checks if the ArrayList with the lines is empty
        if (lines.isEmpty()) {
            return 0;
        }
        
        // initialisation of some parameters
        Object currentValues[] = new Object[2];
        PdfFont currentFont = null;
        float displacement = 0;
        PdfLine l;
        Float lastBaseFactor = new Float(0);
        currentValues[1] = lastBaseFactor;
        // looping over all the lines
        for (Iterator i = lines.iterator(); i.hasNext(); ) {
                        
            // this is a line in the loop
            l = (PdfLine) i.next();
            
            if(isNewpage && newline) { // fix Ken@PDI
                newline=false;
                text.moveText(l.indentLeft() - indentLeft() + indentation.listIndentLeft + indentation.paragraph,-l.height());
            }
            else {
                text.moveText(l.indentLeft() - indentLeft() + indentation.listIndentLeft, -l.height());
            }
            
            // is the line preceeded by a symbol?
            if (l.listSymbol() != null) {
                ColumnText.showTextAligned(graphics, Element.ALIGN_LEFT, new Phrase(l.listSymbol()), text.getXTLM() - l.listIndent(), text.getYTLM(), 0);
            }
            
            currentValues[0] = currentFont;
            
            writeLineToContent(l, text, graphics, currentValues, writer.getSpaceCharRatio());
            
            currentFont = (PdfFont)currentValues[0];
            
            displacement += l.height();
            if (indentLeft() - indentation.listIndentLeft != l.indentLeft()) {
                text.moveText(indentLeft() - l.indentLeft() - indentation.listIndentLeft, 0);
            }
            
        }
        lines = new ArrayList();
        return displacement;
    }
    
    /** The characters to be applied the hanging punctuation. */
    static final String hangingPunctuation = ".,;:'";
    
    /**
     * Writes a text line to the document. It takes care of all the attributes.
     * <P>
     * Before entering the line position must have been established and the
     * <CODE>text</CODE> argument must be in text object scope (<CODE>beginText()</CODE>).
     * @param line the line to be written
     * @param text the <CODE>PdfContentByte</CODE> where the text will be written to
     * @param graphics the <CODE>PdfContentByte</CODE> where the graphics will be written to
     * @param currentValues the current font and extra spacing values
     * @param ratio
     * @throws DocumentException on error
     */
    void writeLineToContent(PdfLine line, PdfContentByte text, PdfContentByte graphics, Object currentValues[], float ratio)  throws DocumentException {
        PdfFont currentFont = (PdfFont)(currentValues[0]);
        float lastBaseFactor = ((Float)(currentValues[1])).floatValue();
        PdfChunk chunk;
        int numberOfSpaces;
        int lineLen;
        boolean isJustified;
        float hangingCorrection = 0;
        float hScale = 1;
        float lastHScale = Float.NaN;
        float baseWordSpacing = 0;
        float baseCharacterSpacing = 0;
        
        numberOfSpaces = line.numberOfSpaces();
        lineLen = line.toString().length();
        // does the line need to be justified?
        isJustified = line.hasToBeJustified() && (numberOfSpaces != 0 || lineLen > 1);
        if (isJustified) {
            if (line.isNewlineSplit() && line.widthLeft() >= (lastBaseFactor * (ratio * numberOfSpaces + lineLen - 1))) {
                if (line.isRTL()) {
                    text.moveText(line.widthLeft() - lastBaseFactor * (ratio * numberOfSpaces + lineLen - 1), 0);
                }
                baseWordSpacing = ratio * lastBaseFactor;
                baseCharacterSpacing = lastBaseFactor;
            }
            else {
                float width = line.widthLeft();
                PdfChunk last = line.getChunk(line.size() - 1);
                if (last != null) {
                    String s = last.toString();
                    char c;
                    if (s.length() > 0 && hangingPunctuation.indexOf((c = s.charAt(s.length() - 1))) >= 0) {
                        float oldWidth = width;
                        width += last.font().width(c) * 0.4f;
                        hangingCorrection = width - oldWidth;
                    }
                }
                float baseFactor = width / (ratio * numberOfSpaces + lineLen - 1);
                baseWordSpacing = ratio * baseFactor;
                baseCharacterSpacing = baseFactor;
                lastBaseFactor = baseFactor;
            }
        }
        
        int lastChunkStroke = line.getLastStrokeChunk();
        int chunkStrokeIdx = 0;
        float xMarker = text.getXTLM();
        float baseXMarker = xMarker;
        float yMarker = text.getYTLM();
        boolean adjustMatrix = false;
        
        // looping over all the chunks in 1 line
        for (Iterator j = line.iterator(); j.hasNext(); ) {
            chunk = (PdfChunk) j.next();
            Color color = chunk.color();
            hScale = 1;
            
            if (chunkStrokeIdx <= lastChunkStroke) {
                float width;
                if (isJustified) {
                    width = chunk.getWidthCorrected(baseCharacterSpacing, baseWordSpacing);
                }
                else
                    width = chunk.width();
                if (chunk.isStroked()) {
                    PdfChunk nextChunk = line.getChunk(chunkStrokeIdx + 1);
                    if (chunk.isAttribute(Chunk.BACKGROUND)) {
                        float subtract = lastBaseFactor;
                        if (nextChunk != null && nextChunk.isAttribute(Chunk.BACKGROUND))
                            subtract = 0;
                        if (nextChunk == null)
                            subtract += hangingCorrection;
                        float fontSize = chunk.font().size();
                        float ascender = chunk.font().getFont().getFontDescriptor(BaseFont.ASCENT, fontSize);
                        float descender = chunk.font().getFont().getFontDescriptor(BaseFont.DESCENT, fontSize);
                        Object bgr[] = (Object[])chunk.getAttribute(Chunk.BACKGROUND);
                        graphics.setColorFill((Color)bgr[0]);
                        float extra[] = (float[])bgr[1];
                        graphics.rectangle(xMarker - extra[0],
                            yMarker + descender - extra[1] + chunk.getTextRise(),
                            width - subtract + extra[0] + extra[2],
                            ascender - descender + extra[1] + extra[3]);
                        graphics.fill();
                        graphics.setGrayFill(0);
                    }
                    if (chunk.isAttribute(Chunk.UNDERLINE)) {
                        float subtract = lastBaseFactor;
                        if (nextChunk != null && nextChunk.isAttribute(Chunk.UNDERLINE))
                            subtract = 0;
                        if (nextChunk == null)
                            subtract += hangingCorrection;
                        Object unders[][] = (Object[][])chunk.getAttribute(Chunk.UNDERLINE);
                        Color scolor = null;
                        for (int k = 0; k < unders.length; ++k) {
                            Object obj[] = unders[k];
                            scolor = (Color)obj[0];
                            float ps[] = (float[])obj[1];
                            if (scolor == null)
                                scolor = color;
                            if (scolor != null)
                                graphics.setColorStroke(scolor);
                            float fsize = chunk.font().size();
                            graphics.setLineWidth(ps[0] + fsize * ps[1]);
                            float shift = ps[2] + fsize * ps[3];
                            int cap2 = (int)ps[4];
                            if (cap2 != 0)
                                graphics.setLineCap(cap2);
                            graphics.moveTo(xMarker, yMarker + shift);
                            graphics.lineTo(xMarker + width - subtract, yMarker + shift);
                            graphics.stroke();
                            if (scolor != null)
                                graphics.resetGrayStroke();
                            if (cap2 != 0)
                                graphics.setLineCap(0);
                        }
                        graphics.setLineWidth(1);
                    }
                    if (chunk.isAttribute(Chunk.ACTION)) {
                        float subtract = lastBaseFactor;
                        if (nextChunk != null && nextChunk.isAttribute(Chunk.ACTION))
                            subtract = 0;
                        if (nextChunk == null)
                            subtract += hangingCorrection;
                        text.addAnnotation(new PdfAnnotation(writer, xMarker, yMarker, xMarker + width - subtract, yMarker + chunk.font().size(), (PdfAction)chunk.getAttribute(Chunk.ACTION)));
                    }
                    if (chunk.isAttribute(Chunk.REMOTEGOTO)) {
                        float subtract = lastBaseFactor;
                        if (nextChunk != null && nextChunk.isAttribute(Chunk.REMOTEGOTO))
                            subtract = 0;
                        if (nextChunk == null)
                            subtract += hangingCorrection;
                        Object obj[] = (Object[])chunk.getAttribute(Chunk.REMOTEGOTO);
                        String filename = (String)obj[0];
                        if (obj[1] instanceof String)
                            remoteGoto(filename, (String)obj[1], xMarker, yMarker, xMarker + width - subtract, yMarker + chunk.font().size());
                        else
                            remoteGoto(filename, ((Integer)obj[1]).intValue(), xMarker, yMarker, xMarker + width - subtract, yMarker + chunk.font().size());
                    }
                    if (chunk.isAttribute(Chunk.LOCALGOTO)) {
                        float subtract = lastBaseFactor;
                        if (nextChunk != null && nextChunk.isAttribute(Chunk.LOCALGOTO))
                            subtract = 0;
                        if (nextChunk == null)
                            subtract += hangingCorrection;
                        localGoto((String)chunk.getAttribute(Chunk.LOCALGOTO), xMarker, yMarker, xMarker + width - subtract, yMarker + chunk.font().size());
                    }
                    if (chunk.isAttribute(Chunk.LOCALDESTINATION)) {
                        float subtract = lastBaseFactor;
                        if (nextChunk != null && nextChunk.isAttribute(Chunk.LOCALDESTINATION))
                            subtract = 0;
                        if (nextChunk == null)
                            subtract += hangingCorrection;
                        localDestination((String)chunk.getAttribute(Chunk.LOCALDESTINATION), new PdfDestination(PdfDestination.XYZ, xMarker, yMarker + chunk.font().size(), 0));
                    }
                    if (chunk.isAttribute(Chunk.GENERICTAG)) {
                        float subtract = lastBaseFactor;
                        if (nextChunk != null && nextChunk.isAttribute(Chunk.GENERICTAG))
                            subtract = 0;
                        if (nextChunk == null)
                            subtract += hangingCorrection;
                        Rectangle rect = new Rectangle(xMarker, yMarker, xMarker + width - subtract, yMarker + chunk.font().size());
                        PdfPageEvent pev = writer.getPageEvent();
                        if (pev != null)
                            pev.onGenericTag(writer, this, rect, (String)chunk.getAttribute(Chunk.GENERICTAG));
                    }
                    if (chunk.isAttribute(Chunk.PDFANNOTATION)) {
                        float subtract = lastBaseFactor;
                        if (nextChunk != null && nextChunk.isAttribute(Chunk.PDFANNOTATION))
                            subtract = 0;
                        if (nextChunk == null)
                            subtract += hangingCorrection;
                        float fontSize = chunk.font().size();
                        float ascender = chunk.font().getFont().getFontDescriptor(BaseFont.ASCENT, fontSize);
                        float descender = chunk.font().getFont().getFontDescriptor(BaseFont.DESCENT, fontSize);
                        PdfAnnotation annot = PdfFormField.shallowDuplicate((PdfAnnotation)chunk.getAttribute(Chunk.PDFANNOTATION));
                        annot.put(PdfName.RECT, new PdfRectangle(xMarker, yMarker + descender, xMarker + width - subtract, yMarker + ascender));
                        text.addAnnotation(annot);
                    }
                    float params[] = (float[])chunk.getAttribute(Chunk.SKEW);
                    Float hs = (Float)chunk.getAttribute(Chunk.HSCALE);
                    if (params != null || hs != null) {
                        float b = 0, c = 0;
                        if (params != null) {
                            b = params[0];
                            c = params[1];
                        }
                        if (hs != null)
                            hScale = hs.floatValue();
                        text.setTextMatrix(hScale, b, c, 1, xMarker, yMarker);
                    }
                    if (chunk.isImage()) {
                        Image image = chunk.getImage();
                        float matrix[] = image.matrix();
                        matrix[Image.CX] = xMarker + chunk.getImageOffsetX() - matrix[Image.CX];
                        matrix[Image.CY] = yMarker + chunk.getImageOffsetY() - matrix[Image.CY];
                        graphics.addImage(image, matrix[0], matrix[1], matrix[2], matrix[3], matrix[4], matrix[5]);
                        text.moveText(xMarker + lastBaseFactor + image.getScaledWidth() - text.getXTLM(), 0);
                    }
                }
                xMarker += width;
                ++chunkStrokeIdx;
            }

            if (chunk.font().compareTo(currentFont) != 0) {
                currentFont = chunk.font();
                text.setFontAndSize(currentFont.getFont(), currentFont.size());
            }
            float rise = 0;
            Object textRender[] = (Object[])chunk.getAttribute(Chunk.TEXTRENDERMODE);
            int tr = 0;
            float strokeWidth = 1;
            Color strokeColor = null;
            Float fr = (Float)chunk.getAttribute(Chunk.SUBSUPSCRIPT);
            if (textRender != null) {
                tr = ((Integer)textRender[0]).intValue() & 3;
                if (tr != PdfContentByte.TEXT_RENDER_MODE_FILL)
                    text.setTextRenderingMode(tr);
                if (tr == PdfContentByte.TEXT_RENDER_MODE_STROKE || tr == PdfContentByte.TEXT_RENDER_MODE_FILL_STROKE) {
                    strokeWidth = ((Float)textRender[1]).floatValue();
                    if (strokeWidth != 1)
                        text.setLineWidth(strokeWidth);
                    strokeColor = (Color)textRender[2];
                    if (strokeColor == null)
                        strokeColor = color;
                    if (strokeColor != null)
                        text.setColorStroke(strokeColor);
                }
            }
            if (fr != null)
                rise = fr.floatValue();
            if (color != null)
                text.setColorFill(color);
            if (rise != 0)
                text.setTextRise(rise);
            if (chunk.isImage()) {
                adjustMatrix = true;
            }
            // If it is a CJK chunk or Unicode TTF we will have to simulate the
            // space adjustment.
            else if (isJustified && numberOfSpaces > 0 && chunk.isSpecialEncoding()) {
                if (hScale != lastHScale) {
                    lastHScale = hScale;
                    text.setWordSpacing(baseWordSpacing / hScale);
                    text.setCharacterSpacing(baseCharacterSpacing / hScale);