pdfcontentbyte.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

     * Appends a Bêzier curve to the path, starting from the current point.
     *
     * @param       x2      x-coordinate of the second control point
     * @param       y2      y-coordinate of the second control point
     * @param       x3      x-coordinaat of the ending point (= new current point)
     * @param       y3      y-coordinaat of the ending point (= new current point)
     */
    
    public void curveTo(float x2, float y2, float x3, float y3) {
        content.append(x2).append(' ').append(y2).append(' ').append(x3).append(' ').append(y3).append(" v").append_i(separator);
    }
    
    /**
     * Appends a Bêzier curve to the path, starting from the current point.
     *
     * @param       x1      x-coordinate of the first control point
     * @param       y1      y-coordinate of the first control point
     * @param       x3      x-coordinaat of the ending point (= new current point)
     * @param       y3      y-coordinaat of the ending point (= new current point)
     */
    
    public void curveFromTo(float x1, float y1, float x3, float y3) {
        content.append(x1).append(' ').append(y1).append(' ').append(x3).append(' ').append(y3).append(" y").append_i(separator);
    }
    
    /** Draws a circle. The endpoint will (x+r, y).
     *
     * @param x x center of circle
     * @param y y center of circle
     * @param r radius of circle
     */
    public void circle(float x, float y, float r) {
        float b = 0.5523f;
        moveTo(x + r, y);
        curveTo(x + r, y + r * b, x + r * b, y + r, x, y + r);
        curveTo(x - r * b, y + r, x - r, y + r * b, x - r, y);
        curveTo(x - r, y - r * b, x - r * b, y - r, x, y - r);
        curveTo(x + r * b, y - r, x + r, y - r * b, x + r, y);
    }
    
    
    
    /**
     * Adds a rectangle to the current path.
     *
     * @param       x       x-coordinate of the starting point
     * @param       y       y-coordinate of the starting point
     * @param       w       width
     * @param       h       height
     */
    
    public void rectangle(float x, float y, float w, float h) {
        content.append(x).append(' ').append(y).append(' ').append(w).append(' ').append(h).append(" re").append_i(separator);
    }
    
    private boolean compareColors(Color c1, Color c2) {
        if (c1 == null && c2 == null)
            return true;
        if (c1 == null || c2 == null)
            return false;
        if (c1 instanceof ExtendedColor)
            return c1.equals(c2);
        return c2.equals(c1);
    }
    
    /**
     * Adds a variable width border to the current path.
     * Only use if {@link com.lowagie.text.Rectangle#isUseVariableBorders() Rectangle.isUseVariableBorders}
     * = true.
     * @param rect a <CODE>Rectangle</CODE>
     */
    public void variableRectangle(Rectangle rect) {
        float t = rect.getTop();
        float b = rect.getBottom();
        float r = rect.getRight();
        float l = rect.getLeft();
        float wt = rect.getBorderWidthTop();
        float wb = rect.getBorderWidthBottom();
        float wr = rect.getBorderWidthRight();
        float wl = rect.getBorderWidthLeft();
        Color ct = rect.getBorderColorTop();
        Color cb = rect.getBorderColorBottom();
        Color cr = rect.getBorderColorRight();
        Color cl = rect.getBorderColorLeft();
        saveState();
        setLineCap(PdfContentByte.LINE_CAP_BUTT);
        setLineJoin(PdfContentByte.LINE_JOIN_MITER);
        float clw = 0;
        boolean cdef = false;
        Color ccol = null;
        boolean cdefi = false;
        Color cfil = null;
        // draw top
        if (wt > 0) {
            setLineWidth(clw = wt);
            cdef = true;
            if (ct == null)
                resetRGBColorStroke();
            else
                setColorStroke(ct);
            ccol = ct;
            moveTo(l, t - wt / 2f);
            lineTo(r, t - wt / 2f);
            stroke();
        }

        // Draw bottom
        if (wb > 0) {
            if (wb != clw)
                setLineWidth(clw = wb);
            if (!cdef || !compareColors(ccol, cb)) {
                cdef = true;
                if (cb == null)
                    resetRGBColorStroke();
                else
                    setColorStroke(cb);
                ccol = cb;
            }
            moveTo(r, b + wb / 2f);
            lineTo(l, b + wb / 2f);
            stroke();
        }

        // Draw right
        if (wr > 0) {
            if (wr != clw)
                setLineWidth(clw = wr);
            if (!cdef || !compareColors(ccol, cr)) {
                cdef = true;
                if (cr == null)
                    resetRGBColorStroke();
                else
                    setColorStroke(cr);
                ccol = cr;
            }
            boolean bt = compareColors(ct, cr);
            boolean bb = compareColors(cb, cr);
            moveTo(r - wr / 2f, bt ? t : t - wt);
            lineTo(r - wr / 2f, bb ? b : b + wb);
            stroke();
            if (!bt || !bb) {
                cdefi = true;
                if (cr == null)
                    resetRGBColorFill();
                else
                    setColorFill(cr);
                cfil = cr;
                if (!bt) {
                    moveTo(r, t);
                    lineTo(r, t - wt);
                    lineTo(r - wr, t - wt);
                    fill();
                }
                if (!bb) {
                    moveTo(r, b);
                    lineTo(r, b + wb);
                    lineTo(r - wr, b + wb);
                    fill();
                }
            }
        }
        
        // Draw Left
        if (wl > 0) {
            if (wl != clw)
                setLineWidth(wl);
            if (!cdef || !compareColors(ccol, cl)) {
                if (cl == null)
                    resetRGBColorStroke();
                else
                    setColorStroke(cl);
            }
            boolean bt = compareColors(ct, cl);
            boolean bb = compareColors(cb, cl);
            moveTo(l + wl / 2f, bt ? t : t - wt);
            lineTo(l + wl / 2f, bb ? b : b + wb);
            stroke();
            if (!bt || !bb) {
                if (!cdefi || !compareColors(cfil, cl)) {
                    if (cl == null)
                        resetRGBColorFill();
                    else
                        setColorFill(cl);
                }
                if (!bt) {
                    moveTo(l, t);
                    lineTo(l, t - wt);
                    lineTo(l + wl, t - wt);
                    fill();
                }
                if (!bb) {
                    moveTo(l, b);
                    lineTo(l, b + wb);
                    lineTo(l + wl, b + wb);
                    fill();
                }
            }
        }
        restoreState();
    }

    /**
     * Adds a border (complete or partially) to the current path..
     *
     * @param       rectangle       a <CODE>Rectangle</CODE>
     */
    
    public void rectangle(Rectangle rectangle) {
        // the coordinates of the border are retrieved
        float x1 = rectangle.getLeft();
        float y1 = rectangle.getBottom();
        float x2 = rectangle.getRight();
        float y2 = rectangle.getTop();

        // the backgroundcolor is set
        Color background = rectangle.getBackgroundColor();
        if (background != null) {
            setColorFill(background);
            rectangle(x1, y1, x2 - x1, y2 - y1);
            fill();
            resetRGBColorFill();
        }

        // if the element hasn't got any borders, nothing is added
        if (! rectangle.hasBorders()) {
            return;
        }

        // if any of the individual border colors are set
        // we draw the borders all around using the
        // different colors
        if (rectangle.isUseVariableBorders()) {
            variableRectangle(rectangle);
        }
        else {
            // the width is set to the width of the element
            if (rectangle.getBorderWidth() != Rectangle.UNDEFINED) {
                setLineWidth(rectangle.getBorderWidth());
            }

            // the color is set to the color of the element
            Color color = rectangle.getBorderColor();
            if (color != null) {
                setColorStroke(color);
            }

            // if the box is a rectangle, it is added as a rectangle
            if (rectangle.hasBorder(Rectangle.BOX)) {
               rectangle(x1, y1, x2 - x1, y2 - y1);
            }
            // if the border isn't a rectangle, the different sides are added apart
            else {
                if (rectangle.hasBorder(Rectangle.RIGHT)) {
                    moveTo(x2, y1);
                    lineTo(x2, y2);
                }
                if (rectangle.hasBorder(Rectangle.LEFT)) {
                    moveTo(x1, y1);
                    lineTo(x1, y2);
                }
                if (rectangle.hasBorder(Rectangle.BOTTOM)) {
                    moveTo(x1, y1);
                    lineTo(x2, y1);
                }
                if (rectangle.hasBorder(Rectangle.TOP)) {
                    moveTo(x1, y2);
                    lineTo(x2, y2);
                }
            }

            stroke();

            if (color != null) {
                resetRGBColorStroke();
            }
        }
    }

    /**
     * Closes the current subpath by appending a straight line segment from the current point
     * to the starting point of the subpath.
     */
    
    public void closePath() {
        content.append("h").append_i(separator);
    }
    
    /**
     * Ends the path without filling or stroking it.
     */
    
    public void newPath() {
        content.append("n").append_i(separator);
    }
    
    /**
     * Strokes the path.
     */
    
    public void stroke() {
        content.append("S").append_i(separator);
    }
    
    /**
     * Closes the path and strokes it.
     */
    
    public void closePathStroke() {
        content.append("s").append_i(separator);
    }
    
    /**
     * Fills the path, using the non-zero winding number rule to determine the region to fill.
     */
    
    public void fill() {
        content.append("f").append_i(separator);
    }
    
    /**
     * Fills the path, using the even-odd rule to determine the region to fill.
     */
    
    public void eoFill() {
        content.append("f*").append_i(separator);
    }
    
    /**
     * Fills the path using the non-zero winding number rule to determine the region to fill and strokes it.
     */
    
    public void fillStroke() {
        content.append("B").append_i(separator);
    }
    
    /**
     * Closes the path, fills it using the non-zero winding number rule to determine the region to fill and strokes it.
     */
    
    public void closePathFillStroke() {
        content.append("b").append_i(separator);
    }
    
    /**
     * Fills the path, using the even-odd rule to determine the region to fill and strokes it.
     */
    
    public void eoFillStroke() {
        content.append("B*").append_i(separator);
    }
    
    /**
     * Closes the path, fills it using the even-odd rule to determine the region to fill and strokes it.
     */
    
    public void closePathEoFillStroke() {
        content.append("b*").append_i(separator);
    }
    
    /**
     * Adds an <CODE>Image</CODE> to the page. The <CODE>Image</CODE> must have
     * absolute positioning.
     * @param image the <CODE>Image</CODE> object