pdfcontentbyte.java

一个java操作pdf文件的开发包,很好用的.

    /**
     * Changes the currentgray tint for stroking paths (device dependent colors!).
     * <P>
     * Sets the color space to <B>DeviceGray</B> (or the <B>DefaultGray</B> color space),
     * and sets the gray tint to use for stroking paths.</P>
     *
     * @param	gray	a value between 0 (black) and 1 (white)
     */
    
    public void setGrayStroke(float gray) {
        content.append(gray).append(" G").append_i(separator);
    }
    
    /**
     * Changes the current gray tint for stroking paths to black.
     */
    
    public void resetGrayStroke() {
        content.append("0 G").append_i(separator);
    }
    
    /**
     * Helper to validate and write the RGB color components
     * @param	red		the intensity of red. A value between 0 and 1
     * @param	green	the intensity of green. A value between 0 and 1
     * @param	blue	the intensity of blue. A value between 0 and 1
     */
    private void HelperRGB(float red, float green, float blue) {
        if (red < 0)
            red = 0.0f;
        else if (red > 1.0f)
            red = 1.0f;
        if (green < 0)
            green = 0.0f;
        else if (green > 1.0f)
            green = 1.0f;
        if (blue < 0)
            blue = 0.0f;
        else if (blue > 1.0f)
            blue = 1.0f;
        content.append(red).append(' ').append(green).append(' ').append(blue);
    }
    
    /**
     * Changes the current color for filling paths (device dependent colors!).
     * <P>
     * Sets the color space to <B>DeviceRGB</B> (or the <B>DefaultRGB</B> color space),
     * and sets the color to use for filling paths.</P>
     * <P>
     * Following the PDF manual, each operand must be a number between 0 (minimum intensity) and
     * 1 (maximum intensity).</P>
     *
     * @param	red		the intensity of red. A value between 0 and 1
     * @param	green	the intensity of green. A value between 0 and 1
     * @param	blue	the intensity of blue. A value between 0 and 1
     */
    
    public void setRGBColorFillF(float red, float green, float blue) {
        HelperRGB(red, green, blue);
        content.append(" rg").append_i(separator);
    }
    
    /**
     * Changes the current color for filling paths to black.
     */
    
    public void resetRGBColorFill() {
        content.append("0 0 0 rg").append_i(separator);
    }
    
    /**
     * Changes the current color for stroking paths (device dependent colors!).
     * <P>
     * Sets the color space to <B>DeviceRGB</B> (or the <B>DefaultRGB</B> color space),
     * and sets the color to use for stroking paths.</P>
     * <P>
     * Following the PDF manual, each operand must be a number between 0 (miniumum intensity) and
     * 1 (maximum intensity).
     *
     * @param	red		the intensity of red. A value between 0 and 1
     * @param	green	the intensity of green. A value between 0 and 1
     * @param	blue	the intensity of blue. A value between 0 and 1
     */
    
    public void setRGBColorStrokeF(float red, float green, float blue) {
        HelperRGB(red, green, blue);
        content.append(" RG").append_i(separator);
    }
    
    /**
     * Changes the current color for stroking paths to black.
     *
     */
    
    public void resetRGBColorStroke() {
        content.append("0 0 0 RG").append_i(separator);
    }
    
    /**
     * Helper to validate and write the CMYK color components.
     *
     * @param	cyan	the intensity of cyan. A value between 0 and 1
     * @param	magenta	the intensity of magenta. A value between 0 and 1
     * @param	yellow	the intensity of yellow. A value between 0 and 1
     * @param	black	the intensity of black. A value between 0 and 1
     */
    private void HelperCMYK(float cyan, float magenta, float yellow, float black) {
        if (cyan < 0)
            cyan = 0.0f;
        else if (cyan > 1.0f)
            cyan = 1.0f;
        if (magenta < 0)
            magenta = 0.0f;
        else if (magenta > 1.0f)
            magenta = 1.0f;
        if (yellow < 0)
            yellow = 0.0f;
        else if (yellow > 1.0f)
            yellow = 1.0f;
        if (black < 0)
            black = 0.0f;
        else if (black > 1.0f)
            black = 1.0f;
        content.append(cyan).append(' ').append(magenta).append(' ').append(yellow).append(' ').append(black);
    }
    
    /**
     * Changes the current color for filling paths (device dependent colors!).
     * <P>
     * Sets the color space to <B>DeviceCMYK</B> (or the <B>DefaultCMYK</B> color space),
     * and sets the color to use for filling paths.</P>
     * <P>
     * Following the PDF manual, each operand must be a number between 0 (no ink) and
     * 1 (maximum ink).</P>
     *
     * @param	cyan	the intensity of cyan. A value between 0 and 1
     * @param	magenta	the intensity of magenta. A value between 0 and 1
     * @param	yellow	the intensity of yellow. A value between 0 and 1
     * @param	black	the intensity of black. A value between 0 and 1
     */
    
    public void setCMYKColorFillF(float cyan, float magenta, float yellow, float black) {
        HelperCMYK(cyan, magenta, yellow, black);
        content.append(" k").append_i(separator);
    }
    
    /**
     * Changes the current color for filling paths to black.
     *
     */
    
    public void resetCMYKColorFill() {
        content.append("0 0 0 1 k").append_i(separator);
    }
    
    /**
     * Changes the current color for stroking paths (device dependent colors!).
     * <P>
     * Sets the color space to <B>DeviceCMYK</B> (or the <B>DefaultCMYK</B> color space),
     * and sets the color to use for stroking paths.</P>
     * <P>
     * Following the PDF manual, each operand must be a number between 0 (miniumum intensity) and
     * 1 (maximum intensity).
     *
     * @param	cyan	the intensity of cyan. A value between 0 and 1
     * @param	magenta	the intensity of magenta. A value between 0 and 1
     * @param	yellow	the intensity of yellow. A value between 0 and 1
     * @param	black	the intensity of black. A value between 0 and 1
     */
    
    public void setCMYKColorStrokeF(float cyan, float magenta, float yellow, float black) {
        HelperCMYK(cyan, magenta, yellow, black);
        content.append(" K").append_i(separator);
    }
    
    /**
     * Changes the current color for stroking paths to black.
     *
     */
    
    public void resetCMYKColorStroke() {
        content.append("0 0 0 1 K").append_i(separator);
    }
    
    /**
     * Move the current point <I>(x, y)</I>, omitting any connecting line segment.
     *
     * @param		x				new x-coordinate
     * @param		y				new y-coordinate
     */
    
    public void moveTo(float x, float y) {
        content.append(x).append(' ').append(y).append(" m").append_i(separator);
    }
    
    /**
     * Appends a straight line segment from the current point <I>(x, y)</I>. The new current
     * point is <I>(x, y)</I>.
     *
     * @param		x				new x-coordinate
     * @param		y				new y-coordinate
     */
    
    public void lineTo(float x, float y) {
        content.append(x).append(' ').append(y).append(" l").append_i(separator);
    }
    
    /**
     * Appends a B陑ier 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		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 x1, float y1, float x2, float y2, float x3, float y3) {
        content.append(x1).append(' ').append(y1).append(' ').append(x2).append(' ').append(y2).append(' ').append(x3).append(' ').append(y3).append(" c").append_i(separator);
    }
    
    /**
     * Appends a B陑ier 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 B陑ier 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);
    }
    
    /**
     * 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.left();
        float y1 = rectangle.top();
        float x2 = rectangle.right();
        float y2 = rectangle.bottom();
        
        // the backgroundcolor is set
        Color background = rectangle.backgroundColor();
        if (background != null) {
            setColorStroke(background);
            setColorFill(background);
            rectangle(x1, y1, x2 - x1, y2 - y1);
            closePathFillStroke();
            resetRGBColorFill();
            resetRGBColorStroke();
        }
        else if (rectangle.grayFill() > 0.0) {
            setGrayStroke((float)rectangle.grayFill());
            setGrayFill((float)rectangle.grayFill());
            rectangle(x1, y1, x2 - x1, y2 - y1);
            closePathFillStroke();
            resetGrayFill();
            resetGrayStroke();
        }
        
        
        // if the element hasn't got any borders, nothing is added
        if (! rectangle.hasBorders()) {
            return;
        }
        
        // the width is set to the width of the element
        if (rectangle.borderWidth() != Rectangle.UNDEFINED) {
            setLineWidth((float)rectangle.borderWidth());
        }
        
        // the color is set to the color of the element
        Color color = rectangle.borderColor();
        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, y2);
                lineTo(x2, y2);
            }
            if (rectangle.hasBorder(Rectangle.TOP)) {
                moveTo(x1, y1);
                lineTo(x2, y1);
            }
        }
        
        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.
     */