pdfcontentbyte.java

来自「有关对pdf操作的代码」· Java 代码 · 共 1,856 行 · 第 1/5 页

     * @param a an element of the transformation matrix
     * @param b an element of the transformation matrix
     * @param c an element of the transformation matrix
     * @param d an element of the transformation matrix
     * @param e an element of the transformation matrix
     * @param f an element of the transformation matrix
     * @throws DocumentException on error
     */
    public void addImage(Image image, float a, float b, float c, float d, float e, float f) throws DocumentException {
        addImage(image, a, b, c, d, e, f, false);
    }
    
    /**
     * Adds an <CODE>Image</CODE> to the page. The positioning of the <CODE>Image</CODE>
     * is done with the transformation matrix. To position an <CODE>image</CODE> at (x,y)
     * use addImage(image, image_width, 0, 0, image_height, x, y). The image can be placed inline.
     * @param image the <CODE>Image</CODE> object
     * @param a an element of the transformation matrix
     * @param b an element of the transformation matrix
     * @param c an element of the transformation matrix
     * @param d an element of the transformation matrix
     * @param e an element of the transformation matrix
     * @param f an element of the transformation matrix
     * @param inlineImage <CODE>true</CODE> to place this image inline, <CODE>false</CODE> otherwise
     * @throws DocumentException on error
     */
    public void addImage(Image image, float a, float b, float c, float d, float e, float f, boolean inlineImage) throws DocumentException {
        try {
            if (image.getLayer() != null)
                beginLayer(image.getLayer());
            if (image.isImgTemplate()) {
                writer.addDirectImageSimple(image);
                PdfTemplate template = image.getTemplateData();
                float w = template.getWidth();
                float h = template.getHeight();
                addTemplate(template, a / w, b / w, c / h, d / h, e, f);
            }
            else {
                content.append("q ");
                content.append(a).append(' ');
                content.append(b).append(' ');
                content.append(c).append(' ');
                content.append(d).append(' ');
                content.append(e).append(' ');
                content.append(f).append(" cm");
                if (inlineImage) {
                    content.append("\nBI\n");
                    PdfImage pimage = new PdfImage(image, "", null);
                    for (Iterator it = pimage.getKeys().iterator(); it.hasNext();) {
                        PdfName key = (PdfName)it.next();
                        PdfObject value = pimage.get(key);
                        String s = (String)abrev.get(key);
                        if (s == null)
                            continue;
                        content.append(s);
                        boolean check = true;
                        if (key.equals(PdfName.COLORSPACE) && value.isArray()) {
                            ArrayList ar = ((PdfArray)value).getArrayList();
                            if (ar.size() == 4 
                                && PdfName.INDEXED.equals(ar.get(0)) 
                                && ((PdfObject)ar.get(1)).isName()
                                && ((PdfObject)ar.get(2)).isNumber()
                                && ((PdfObject)ar.get(3)).isString()
                            ) {
                                check = false;
                            }
                            
                        }
                        if (check && key.equals(PdfName.COLORSPACE) && !value.isName()) {
                            PdfName cs = writer.getColorspaceName();
                            PageResources prs = getPageResources();
                            prs.addColor(cs, writer.addToBody(value).getIndirectReference());
                            value = cs;
                        }
                        value.toPdf(null, content);
                        content.append('\n');
                    }
                    content.append("ID\n");
                    pimage.writeContent(content);
                    content.append("\nEI\nQ").append_i(separator);
                }
                else {
                    PdfName name;
                    PageResources prs = getPageResources();
                    Image maskImage = image.getImageMask();
                    if (maskImage != null) {
                        name = writer.addDirectImageSimple(maskImage);
                        prs.addXObject(name, writer.getImageReference(name));
                    }
                    name = writer.addDirectImageSimple(image);
                    name = prs.addXObject(name, writer.getImageReference(name));
                    content.append(' ').append(name.getBytes()).append(" Do Q").append_i(separator);
                }
            }
            if (image.hasBorders()) {
                saveState();
                float w = image.getWidth();
                float h = image.getHeight();
                concatCTM(a / w, b / w, c / h, d / h, e, f);
                rectangle(image);
                restoreState();
            }
            if (image.getLayer() != null)
                endLayer();
            Annotation annot = image.getAnnotation();
            if (annot == null)
                return;
            float[] r = new float[unitRect.length];
            for (int k = 0; k < unitRect.length; k += 2) {
                r[k] = a * unitRect[k] + c * unitRect[k + 1] + e;
                r[k + 1] = b * unitRect[k] + d * unitRect[k + 1] + f;
            }
            float llx = r[0];
            float lly = r[1];
            float urx = llx;
            float ury = lly;
            for (int k = 2; k < r.length; k += 2) {
                llx = Math.min(llx, r[k]);
                lly = Math.min(lly, r[k + 1]);
                urx = Math.max(urx, r[k]);
                ury = Math.max(ury, r[k + 1]);
            }
            annot = new Annotation(annot);
            annot.setDimensions(llx, lly, urx, ury);
            PdfAnnotation an = PdfAnnotationsImp.convertAnnotation(writer, annot, new Rectangle(llx, lly, urx, ury));
            if (an == null)
                return;
            addAnnotation(an);
        }
        catch (Exception ee) {
            throw new DocumentException(ee);
        }
    }
    
    /**
     * Makes this <CODE>PdfContentByte</CODE> empty.
     */
    public void reset() {
        content.reset();
        stateList.clear();
        state = new GraphicState();
    }
    
    /**
     * Starts the writing of text.
     */
    public void beginText() {
        state.xTLM = 0;
        state.yTLM = 0;
        content.append("BT").append_i(separator);
    }
    
    /**
     * Ends the writing of text and makes the current font invalid.
     */
    public void endText() {
        content.append("ET").append_i(separator);
    }
    
    /**
     * Saves the graphic state. <CODE>saveState</CODE> and
     * <CODE>restoreState</CODE> must be balanced.
     */
    public void saveState() {
        content.append("q").append_i(separator);
        stateList.add(new GraphicState(state));
    }
    
    /**
     * Restores the graphic state. <CODE>saveState</CODE> and
     * <CODE>restoreState</CODE> must be balanced.
     */
    public void restoreState() {
        content.append("Q").append_i(separator);
        int idx = stateList.size() - 1;
        if (idx < 0)
            throw new RuntimeException("Unbalanced save/restore state operators.");
        state = (GraphicState)stateList.get(idx);
        stateList.remove(idx);
    }
    
    /**
     * Sets the character spacing parameter.
     *
     * @param       charSpace           a parameter
     */
    public void setCharacterSpacing(float charSpace) {
        state.charSpace = charSpace;
        content.append(charSpace).append(" Tc").append_i(separator);
    }
    
    /**
     * Sets the word spacing parameter.
     *
     * @param       wordSpace           a parameter
     */
    public void setWordSpacing(float wordSpace) {
        state.wordSpace = wordSpace;
        content.append(wordSpace).append(" Tw").append_i(separator);
    }
    
    /**
     * Sets the horizontal scaling parameter.
     *
     * @param       scale               a parameter
     */
    public void setHorizontalScaling(float scale) {
        state.scale = scale;
        content.append(scale).append(" Tz").append_i(separator);
    }
    
    /**
     * Sets the text leading parameter.
     * <P>
     * The leading parameter is measured in text space units. It specifies the vertical distance
     * between the baselines of adjacent lines of text.</P>
     *
     * @param       leading         the new leading
     */
    public void setLeading(float leading) {
        state.leading = leading;
        content.append(leading).append(" TL").append_i(separator);
    }
    
    /**
     * Set the font and the size for the subsequent text writing.
     *
     * @param bf the font
     * @param size the font size in points
     */
    public void setFontAndSize(BaseFont bf, float size) {
        checkWriter();
        if (size < 0.0001f && size > -0.0001f)
            throw new IllegalArgumentException("Font size too small: " + size);
        state.size = size;
        state.fontDetails = writer.addSimple(bf);
        PageResources prs = getPageResources();
        PdfName name = state.fontDetails.getFontName();
        name = prs.addFont(name, state.fontDetails.getIndirectReference());
        content.append(name.getBytes()).append(' ').append(size).append(" Tf").append_i(separator);
    }
    
    /**
     * Sets the text rendering parameter.
     *
     * @param       rendering               a parameter
     */
    public void setTextRenderingMode(int rendering) {
        content.append(rendering).append(" Tr").append_i(separator);
    }
    
    /**
     * Sets the text rise parameter.
     * <P>
     * This allows to write text in subscript or superscript mode.</P>
     *
     * @param       rise                a parameter
     */
    public void setTextRise(float rise) {
        content.append(rise).append(" Ts").append_i(separator);
    }
    
    /**
     * A helper to insert into the content stream the <CODE>text</CODE>
     * converted to bytes according to the font's encoding.
     *
     * @param text the text to write
     */
    private void showText2(String text) {
        if (state.fontDetails == null)
            throw new NullPointerException("Font and size must be set before writing any text");
        byte b[] = state.fontDetails.convertToBytes(text);
        escapeString(b, content);
    }
    
    /**
     * Shows the <CODE>text</CODE>.
     *
     * @param text the text to write
     */
    public void showText(String text) {
        showText2(text);
        content.append("Tj").append_i(separator);
    }
    
    /**
     * Constructs a kern array for a text in a certain font
     * @param text the text
     * @param font the font
     * @return a PdfTextArray
     */
    public static PdfTextArray getKernArray(String text, BaseFont font) {
        PdfTextArray pa = new PdfTextArray();
        StringBuffer acc = new StringBuffer();
        int len = text.length() - 1;
        char c[] = text.toCharArray();
        if (len >= 0)
            acc.append(c, 0, 1);
        for (int k = 0; k < len; ++k) {
            char c2 = c[k + 1];
            int kern = font.getKerning(c[k], c2);
            if (kern == 0) {
                acc.append(c2);
            }
            else {
                pa.add(acc.toString());
                acc.setLength(0);
                acc.append(c, k + 1, 1);
                pa.add(-kern);
            }
        }
        pa.add(acc.toString());
        return pa;
    }
    
    /**
     * Shows the <CODE>text</CODE> kerned.
     *
     * @param text the text to write
     */
    public void showTextKerned(String text) {
        if (state.fontDetails == null)
            throw new NullPointerException("Font and size must be set before writing any text");
        BaseFont bf = state.fontDetails.getBaseFont();
        if (bf.hasKernPairs())
            showText(getKernArray(text, bf));
        else
            showText(text);
    }
    
    /**
     * Moves to the next line and shows <CODE>text</CODE>.
     *
     * @param text the text to write
     */
    public void newlineShowText(String text) {
        state.yTLM -= state.leading;
        showText2(text);
        content.append("'").append_i(separator);
    }
    
    /**
     * Moves to the next line and shows text string, using the given values of the character and word spacing parameters.
     *
     * @param       wordSpacing     a parameter
     * @param       charSpacing     a parameter
     * @param text the text to write
     */
    public void newlineShowText(float wordSpacing, float charSpacing, String text) {
        state.yTLM -= state.leading;
        content.append(wordSpacing).append(' ').append(charSpacing);
        showText2(text);
        content.append("\"").append_i(separator);
        
        // The " operator sets charSpace and wordSpace into graphics state
        // (cfr PDF reference v1.6, table 5.6)
        state.charSpace = charSpacing;
        state.wordSpace = wordSpacing;
    }
    
    /**
     * Changes the text matrix.
     * <P>
     * Remark: this operation also initializes the current point position.</P>
     *
     * @param       a           operand 1,1 in the matrix
     * @param       b           operand 1,2 in the matrix
     * @param       c           operand 2,1 in the matrix
     * @param       d           operand 2,2 in the matrix
     * @param       x           operand 3,1 in the matrix
     * @param       y           operand 3,2 in the matrix
     */