org.jfree.chart

Class ChartUtilities

public abstract class ChartUtilities extends Object

A collection of utility methods for JFreeChart. Includes methods for converting charts to image formats (PNG and JPEG) plus creating simple HTML image maps.

See Also: ImageMapUtilities

Method Summary
static void	applyCurrentTheme(JFreeChart chart) Applies the current theme to the specified chart.
static byte[]	encodeAsPNG(BufferedImage image) Encodes a BufferedImage to PNG format.
static byte[]	encodeAsPNG(BufferedImage image, boolean encodeAlpha, int compression) Encodes a BufferedImage to PNG format.
static String	getImageMap(String name, ChartRenderingInfo info) Creates an HTML image map.
static String	getImageMap(String name, ChartRenderingInfo info, ToolTipTagFragmentGenerator toolTipTagFragmentGenerator, URLTagFragmentGenerator urlTagFragmentGenerator) Creates an HTML image map.
static void	saveChartAsJPEG(File file, JFreeChart chart, int width, int height) Saves a chart to a file in JPEG format.
static void	saveChartAsJPEG(File file, float quality, JFreeChart chart, int width, int height) Saves a chart to a file in JPEG format.
static void	saveChartAsJPEG(File file, JFreeChart chart, int width, int height, ChartRenderingInfo info) Saves a chart to a file in JPEG format.
static void	saveChartAsJPEG(File file, float quality, JFreeChart chart, int width, int height, ChartRenderingInfo info) Saves a chart to a file in JPEG format.
static void	saveChartAsPNG(File file, JFreeChart chart, int width, int height) Saves a chart to the specified file in PNG format.
static void	saveChartAsPNG(File file, JFreeChart chart, int width, int height, ChartRenderingInfo info) Saves a chart to a file in PNG format.
static void	saveChartAsPNG(File file, JFreeChart chart, int width, int height, ChartRenderingInfo info, boolean encodeAlpha, int compression) Saves a chart to a file in PNG format.
static void	writeBufferedImageAsJPEG(OutputStream out, BufferedImage image) Writes a BufferedImage to an output stream in JPEG format.
static void	writeBufferedImageAsJPEG(OutputStream out, float quality, BufferedImage image) Writes a BufferedImage to an output stream in JPEG format.
static void	writeBufferedImageAsPNG(OutputStream out, BufferedImage image) Writes a BufferedImage to an output stream in PNG format.
static void	writeBufferedImageAsPNG(OutputStream out, BufferedImage image, boolean encodeAlpha, int compression) Writes a BufferedImage to an output stream in PNG format.
static void	writeChartAsJPEG(OutputStream out, JFreeChart chart, int width, int height) Writes a chart to an output stream in JPEG format.
static void	writeChartAsJPEG(OutputStream out, float quality, JFreeChart chart, int width, int height) Writes a chart to an output stream in JPEG format.
static void	writeChartAsJPEG(OutputStream out, JFreeChart chart, int width, int height, ChartRenderingInfo info) Writes a chart to an output stream in JPEG format.
static void	writeChartAsJPEG(OutputStream out, float quality, JFreeChart chart, int width, int height, ChartRenderingInfo info) Writes a chart to an output stream in JPEG format.
static void	writeChartAsPNG(OutputStream out, JFreeChart chart, int width, int height) Writes a chart to an output stream in PNG format.
static void	writeChartAsPNG(OutputStream out, JFreeChart chart, int width, int height, boolean encodeAlpha, int compression) Writes a chart to an output stream in PNG format.
static void	writeChartAsPNG(OutputStream out, JFreeChart chart, int width, int height, ChartRenderingInfo info) Writes a chart to an output stream in PNG format.
static void	writeChartAsPNG(OutputStream out, JFreeChart chart, int width, int height, ChartRenderingInfo info, boolean encodeAlpha, int compression) Writes a chart to an output stream in PNG format.
static void	writeImageMap(PrintWriter writer, String name, ChartRenderingInfo info, boolean useOverLibForToolTips) Writes an image map to an output stream.
static void	writeImageMap(PrintWriter writer, String name, ChartRenderingInfo info, ToolTipTagFragmentGenerator toolTipTagFragmentGenerator, URLTagFragmentGenerator urlTagFragmentGenerator) Writes an image map to the specified writer.
static void	writeScaledChartAsPNG(OutputStream out, JFreeChart chart, int width, int height, int widthScaleFactor, int heightScaleFactor) Writes a scaled version of a chart to an output stream in PNG format.

Method Detail

applyCurrentTheme

public static void applyCurrentTheme(JFreeChart chart)

Applies the current theme to the specified chart. This method is provided for convenience, the theme itself is stored in the ChartFactory class.

Parameters: chart the chart (null not permitted).

Since: 1.0.11

encodeAsPNG

public static byte[] encodeAsPNG(BufferedImage image)

Encodes a BufferedImage to PNG format.

Parameters: image the image (null not permitted).

Returns: A byte array in PNG format.

Throws: IOException if there is an I/O problem.

encodeAsPNG

public static byte[] encodeAsPNG(BufferedImage image, boolean encodeAlpha, int compression)

Encodes a BufferedImage to PNG format.

Parameters: image the image (null not permitted). encodeAlpha encode alpha? compression the PNG compression level (0-9).

Returns: The byte array in PNG format.

Throws: IOException if there is an I/O problem.

getImageMap

public static String getImageMap(String name, ChartRenderingInfo info)

Creates an HTML image map. This method maps to ImageMapUtilities, using default generators.

Parameters: name the map name (null not permitted). info the chart rendering info (null not permitted).

Returns: The map tag.

getImageMap

public static String getImageMap(String name, ChartRenderingInfo info, ToolTipTagFragmentGenerator toolTipTagFragmentGenerator, URLTagFragmentGenerator urlTagFragmentGenerator)

Creates an HTML image map. This method maps directly to ImageMapUtilities.

Parameters: name the map name (null not permitted). info the chart rendering info (null not permitted). toolTipTagFragmentGenerator a generator for the HTML fragment that will contain the tooltip text (null not permitted if info contains tooltip information). urlTagFragmentGenerator a generator for the HTML fragment that will contain the URL reference (null not permitted if info contains URLs).

Returns: The map tag.

saveChartAsJPEG

public static void saveChartAsJPEG(File file, JFreeChart chart, int width, int height)

Saves a chart to a file in JPEG format.

Parameters: file the file (null not permitted). chart the chart (null not permitted). width the image width. height the image height.