chartutilities.java

java图形利器

     * @param out  the output stream (<code>null</code> not permitted).
     * @param quality  the quality setting.
     * @param chart  the chart (<code>null</code> not permitted).
     * @param width  the image width.
     * @param height  the image height.
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeChartAsJPEG(OutputStream out, float quality,
            JFreeChart chart, int width, int height) throws IOException {

        // defer argument checking...
        ChartUtilities.writeChartAsJPEG(out, quality, chart, width, height, 
                null);

    }

    /**
     * Writes a chart to an output stream in JPEG format. This method allows 
     * you to pass in a {@link ChartRenderingInfo} object, to collect 
     * information about the chart dimensions/entities.  You will need this 
     * info if you want to create an HTML image map.
     *
     * @param out  the output stream (<code>null</code> not permitted).
     * @param chart  the chart (<code>null</code> not permitted).
     * @param width  the image width.
     * @param height  the image height.
     * @param info  the chart rendering info (<code>null</code> permitted).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeChartAsJPEG(OutputStream out, JFreeChart chart,
            int width, int height, ChartRenderingInfo info) 
            throws IOException {

        if (chart == null) {
            throw new IllegalArgumentException("Null 'chart' argument.");
        }
        BufferedImage image = chart.createBufferedImage(width, height, info);
        EncoderUtil.writeBufferedImage(image, ImageFormat.JPEG, out);

    }

    /**
     * Writes a chart to an output stream in JPEG format.  This method allows 
     * you to pass in a {@link ChartRenderingInfo} object, to collect 
     * information about the chart dimensions/entities.  You will need this 
     * info if you want to create an HTML image map.
     *
     * @param out  the output stream (<code>null</code> not permitted).
     * @param quality  the output quality (0.0f to 1.0f).
     * @param chart  the chart (<code>null</code> not permitted).
     * @param width  the image width.
     * @param height  the image height.
     * @param info  the chart rendering info (<code>null</code> permitted).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeChartAsJPEG(OutputStream out, float quality,
            JFreeChart chart, int width, int height, ChartRenderingInfo info) 
            throws IOException {

        if (chart == null) {
            throw new IllegalArgumentException("Null 'chart' argument.");
        }
        BufferedImage image = chart.createBufferedImage(width, height, info);
        EncoderUtil.writeBufferedImage(image, ImageFormat.JPEG, out, quality);

    }

    /**
     * Saves a chart to a file in JPEG format.
     *
     * @param file  the file (<code>null</code> not permitted).
     * @param chart  the chart (<code>null</code> not permitted).
     * @param width  the image width.
     * @param height  the image height.
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void saveChartAsJPEG(File file, JFreeChart chart,
            int width, int height) throws IOException {

        // defer argument checking...
        saveChartAsJPEG(file, chart, width, height, null);

    }

    /**
     * Saves a chart to a file in JPEG format.
     *
     * @param file  the file (<code>null</code> not permitted).
     * @param quality  the JPEG quality setting.
     * @param chart  the chart (<code>null</code> not permitted).
     * @param width  the image width.
     * @param height  the image height.
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void saveChartAsJPEG(File file, float quality,
            JFreeChart chart, int width, int height) throws IOException {

        // defer argument checking...
        saveChartAsJPEG(file, quality, chart, width, height, null);

    }

    /**
     * Saves a chart to a file in JPEG format.  This method allows you to pass 
     * in a {@link ChartRenderingInfo} object, to collect information about the 
     * chart dimensions/entities.  You will need this info if you want to 
     * create an HTML image map.
     *
     * @param file  the file name (<code>null</code> not permitted).
     * @param chart  the chart (<code>null</code> not permitted).
     * @param width  the image width.
     * @param height  the image height.
     * @param info  the chart rendering info (<code>null</code> permitted).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void saveChartAsJPEG(File file, JFreeChart chart,
            int width, int height, ChartRenderingInfo info) throws IOException {

        if (file == null) {
            throw new IllegalArgumentException("Null 'file' argument.");
        }
        if (chart == null) {
            throw new IllegalArgumentException("Null 'chart' argument.");
        }
        OutputStream out = new BufferedOutputStream(new FileOutputStream(file));
        try {
            writeChartAsJPEG(out, chart, width, height, info);
        }
        finally {
            out.close();
        }

    }

    /**
     * Saves a chart to a file in JPEG format.  This method allows you to pass 
     * in a {@link ChartRenderingInfo} object, to collect information about the 
     * chart dimensions/entities.  You will need this info if you want to 
     * create an HTML image map.
     *
     * @param file  the file name (<code>null</code> not permitted).
     * @param quality  the quality setting.
     * @param chart  the chart (<code>null</code> not permitted).
     * @param width  the image width.
     * @param height  the image height.
     * @param info  the chart rendering info (<code>null</code> permitted).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void saveChartAsJPEG(File file, float quality,
            JFreeChart chart, int width, int height,
            ChartRenderingInfo info) throws IOException {

        if (file == null) {
            throw new IllegalArgumentException("Null 'file' argument.");
        }
        if (chart == null) {
            throw new IllegalArgumentException("Null 'chart' argument.");
        }
        
        OutputStream out = new BufferedOutputStream(new FileOutputStream(
                file));
        try {
            writeChartAsJPEG(out, quality, chart, width, height, info);
        }
        finally {
            out.close();
        }

    }

    /**
     * Writes a {@link BufferedImage} to an output stream in JPEG format.
     *
     * @param out  the output stream (<code>null</code> not permitted).
     * @param image  the image (<code>null</code> not permitted).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeBufferedImageAsJPEG(OutputStream out, 
            BufferedImage image) throws IOException {

        // defer argument checking...
        writeBufferedImageAsJPEG(out, 0.75f, image);

    }

    /**
     * Writes a {@link BufferedImage} to an output stream in JPEG format.
     *
     * @param out  the output stream (<code>null</code> not permitted).
     * @param quality  the image quality (0.0f to 1.0f).
     * @param image  the image (<code>null</code> not permitted).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeBufferedImageAsJPEG(OutputStream out, float quality,
            BufferedImage image) throws IOException {

        EncoderUtil.writeBufferedImage(image, ImageFormat.JPEG, out, quality);

    }

    /**
     * Writes a {@link BufferedImage} to an output stream in PNG format.
     *
     * @param out  the output stream (<code>null</code> not permitted).
     * @param image  the image (<code>null</code> not permitted).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeBufferedImageAsPNG(OutputStream out, 
            BufferedImage image) throws IOException {

        EncoderUtil.writeBufferedImage(image, ImageFormat.PNG, out);

    }

    /**
     * Writes a {@link BufferedImage} to an output stream in PNG format.
     *
     * @param out  the output stream (<code>null</code> not permitted).
     * @param image  the image (<code>null</code> not permitted).
     * @param encodeAlpha  encode alpha?
     * @param compression  the compression level (0-9).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeBufferedImageAsPNG(OutputStream out,
            BufferedImage image, boolean encodeAlpha, int compression) 
            throws IOException {

        EncoderUtil.writeBufferedImage(image, ImageFormat.PNG, out, 
                compression, encodeAlpha);
    }

    /**
     * Encodes a {@link BufferedImage} to PNG format.
     *
     * @param image  the image (<code>null</code> not permitted).
     *
     * @return A byte array in PNG format.
     * 
     * @throws IOException if there is an I/O problem.
     */
    public static byte[] encodeAsPNG(BufferedImage image) throws IOException {
        return EncoderUtil.encode(image, ImageFormat.PNG);
    }

    /**
     * Encodes a {@link BufferedImage} to PNG format.
     *
     * @param image  the image (<code>null</code> not permitted).
     * @param encodeAlpha  encode alpha?
     * @param compression  the PNG compression level (0-9).
     *
     * @return The byte array in PNG format.
     * 
     * @throws IOException if there is an I/O problem.
     */
    public static byte[] encodeAsPNG(BufferedImage image, boolean encodeAlpha, 
                                     int compression) 
            throws IOException {
        return EncoderUtil.encode(image, ImageFormat.PNG, compression, 
                encodeAlpha);
    }

    /**
     * Writes an image map to an output stream.
     *
     * @param writer  the writer (<code>null</code> not permitted).
     * @param name  the map name (<code>null</code> not permitted).
     * @param info  the chart rendering info (<code>null</code> not permitted).
     * @param useOverLibForToolTips  whether to use OverLIB for tooltips
     *                               (http://www.bosrup.com/web/overlib/).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeImageMap(PrintWriter writer,
                                     String name,
                                     ChartRenderingInfo info,
                                     boolean useOverLibForToolTips) 
        throws IOException {

        ToolTipTagFragmentGenerator toolTipTagFragmentGenerator = null;
        if (useOverLibForToolTips) {
            toolTipTagFragmentGenerator 
                    = new OverLIBToolTipTagFragmentGenerator();
        }
        else {
            toolTipTagFragmentGenerator 
                    = new StandardToolTipTagFragmentGenerator();
        }
        ImageMapUtilities.writeImageMap(writer, name, info, 
                toolTipTagFragmentGenerator, 
                new StandardURLTagFragmentGenerator());

    }

    /**
     * Writes an image map to the specified writer.
     *
     * @param writer  the writer (<code>null</code> not permitted).
     * @param name  the map name (<code>null</code> not permitted).
     * @param info  the chart rendering info (<code>null</code> not permitted).
     * @param toolTipTagFragmentGenerator  a generator for the HTML fragment
     *     that will contain the tooltip text (<code>null</code> not permitted 
     *     if <code>info</code> contains tooltip information).
     * @param urlTagFragmentGenerator  a generator for the HTML fragment that
     *     will contain the URL reference (<code>null</code> not permitted if 
     *     <code>info</code> contains URLs).
     *
     * @throws IOException if there are any I/O errors.
     */
    public static void writeImageMap(PrintWriter writer, String name, 
            ChartRenderingInfo info, 
            ToolTipTagFragmentGenerator toolTipTagFragmentGenerator,
            URLTagFragmentGenerator urlTagFragmentGenerator) 
            throws IOException {

        writer.println(ImageMapUtilities.getImageMap(name, info, 
                toolTipTagFragmentGenerator, urlTagFragmentGenerator));
    }

    /**
     * Creates an HTML image map.  This method maps to 
     * {@link ImageMapUtilities#getImageMap(String, ChartRenderingInfo, 
     * ToolTipTagFragmentGenerator, URLTagFragmentGenerator)}, using default 
     * generators.
     *
     * @param name  the map name (<code>null</code> not permitted).
     * @param info  the chart rendering info (<code>null</code> not permitted).
     *
     * @return The map tag.
     */
    public static String getImageMap(String name, ChartRenderingInfo info) {
        return ImageMapUtilities.getImageMap(name, info,
                new StandardToolTipTagFragmentGenerator(),
                new StandardURLTagFragmentGenerator());
    }

    /**
     * Creates an HTML image map.  This method maps directly to
     * {@link ImageMapUtilities#getImageMap(String, ChartRenderingInfo, 
     * ToolTipTagFragmentGenerator, URLTagFragmentGenerator)}.
     *
     * @param name  the map name (<code>null</code> not permitted).
     * @param info  the chart rendering info (<code>null</code> not permitted).
     * @param toolTipTagFragmentGenerator  a generator for the HTML fragment
     *     that will contain the tooltip text (<code>null</code> not permitted 
     *     if <code>info</code> contains tooltip information).
     * @param urlTagFragmentGenerator  a generator for the HTML fragment that
     *     will contain the URL reference (<code>null</code> not permitted if 
     *     <code>info</code> contains URLs).
     *
     * @return The map tag.
     */
    public static String getImageMap(String name, ChartRenderingInfo info,
            ToolTipTagFragmentGenerator toolTipTagFragmentGenerator,
            URLTagFragmentGenerator urlTagFragmentGenerator) {

        return ImageMapUtilities.getImageMap(name, info, 
                toolTipTagFragmentGenerator, urlTagFragmentGenerator);
        
    }

}