Package org.jfree.chart

Class ChartUtils

java.lang.Object

org.jfree.chart.ChartUtils

public abstract class ChartUtils
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:

ImageMapUtils

Constructor Summary

Constructors

Constructor	Description
ChartUtils()

Method Summary

Modifier and Type	Method	Description
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, float quality, 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, ChartRenderingInfo info)	Saves a chart to a file in JPEG format.
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, 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, float quality, BufferedImage image)	Writes a BufferedImage to an output stream in JPEG format.
static void	writeBufferedImageAsJPEG(OutputStream out, 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, float quality, 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, ChartRenderingInfo info)	Writes a chart to an output stream in JPEG 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, 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.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ChartUtils

public ChartUtils()

Method Details

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).

writeChartAsPNG

public static void writeChartAsPNG(OutputStream out,
JFreeChart chart,
int width,
int height)
                            throws IOException

Writes a chart to an output stream in PNG format.

Parameters:

out - the output stream (null not permitted).

chart - the chart (null not permitted).

width - the image width.

height - the image height.

Throws:

IOException - if there are any I/O errors.

writeChartAsPNG

public static void writeChartAsPNG(OutputStream out,
JFreeChart chart,
int width,
int height,
boolean encodeAlpha,
int compression)
                            throws IOException

Writes a chart to an output stream in PNG format.

Parameters:

out - the output stream (null not permitted).

chart - the chart (null not permitted).

width - the image width.

height - the image height.

encodeAlpha - encode alpha?

compression - the compression level (0-9).

Throws:

IOException - if there are any I/O errors.

writeChartAsPNG

public static void writeChartAsPNG(OutputStream out,
JFreeChart chart,
int width,
int height,
ChartRenderingInfo info)
                            throws IOException

Writes a chart to an output stream in PNG format. This method allows you to pass in a ChartRenderingInfo object, to collect information about the chart dimensions/entities. You will need this info if you want to create an HTML image map.

Parameters:

out - the output stream (null not permitted).

chart - the chart (null not permitted).

width - the image width.

height - the image height.

info - the chart rendering info (null permitted).

Throws:

IOException - if there are any I/O errors.

writeChartAsPNG

public static void writeChartAsPNG(OutputStream out,
JFreeChart chart,
int width,
int height,
ChartRenderingInfo info,
boolean encodeAlpha,
int compression)
                            throws IOException

Writes a chart to an output stream in PNG format. This method allows you to pass in a ChartRenderingInfo object, to collect information about the chart dimensions/entities. You will need this info if you want to create an HTML image map.

Parameters:

out - the output stream (null not permitted).

chart - the chart (null not permitted).

width - the image width.

height - the image height.

info - carries back chart rendering info (null permitted).

encodeAlpha - encode alpha?

compression - the PNG compression level (0-9).

Throws:

IOException - if there are any I/O errors.

writeScaledChartAsPNG

public static void writeScaledChartAsPNG(OutputStream out,
JFreeChart chart,
int width,
int height,
int widthScaleFactor,
int heightScaleFactor)
                                  throws IOException

Writes a scaled version of a chart to an output stream in PNG format.

Parameters:

out - the output stream (null not permitted).

chart - the chart (null not permitted).

width - the unscaled chart width.

height - the unscaled chart height.

widthScaleFactor - the horizontal scale factor.

heightScaleFactor - the vertical scale factor.

Throws:

IOException - if there are any I/O problems.

saveChartAsPNG

public static void saveChartAsPNG(File file,
JFreeChart chart,
int width,
int height)
                           throws IOException

Saves a chart to the specified file in PNG format.

Parameters:

file - the file name (null not permitted).

chart - the chart (null not permitted).

width - the image width.

height - the image height.

Throws:

IOException - if there are any I/O errors.

saveChartAsPNG

public static void saveChartAsPNG(File file,
JFreeChart chart,
int width,
int height,
ChartRenderingInfo info)
                           throws IOException

Saves a chart to a file in PNG format. This method allows you to pass in a ChartRenderingInfo object, to collect information about the chart dimensions/entities. You will need this info if you want to create an HTML image map.

Parameters:

file - the file (null not permitted).

chart - the chart (null not permitted).

width - the image width.

height - the image height.

info - the chart rendering info (null permitted).

Throws:

IOException - if there are any I/O errors.

saveChartAsPNG

public static void saveChartAsPNG(File file,
JFreeChart chart,
int width,
int height,
ChartRenderingInfo info,
boolean encodeAlpha,
int compression)
                           throws IOException

Saves a chart to a file in PNG format. This method allows you to pass in a ChartRenderingInfo object, to collect information about the chart dimensions/entities. You will need this info if you want to create an HTML image map.

Parameters:

file - the file (null not permitted).

chart - the chart (null not permitted).

width - the image width.

height - the image height.

info - the chart rendering info (null permitted).

encodeAlpha - encode alpha?

compression - the PNG compression level (0-9).

Throws:

IOException - if there are any I/O errors.

writeChartAsJPEG

public static void writeChartAsJPEG(OutputStream out,
JFreeChart chart,
int width,
int height)
                             throws IOException

Writes a chart to an output stream in JPEG format. Please note that JPEG is a poor format for chart images, use PNG if possible.

Parameters:

out - the output stream (null not permitted).

chart - the chart (null not permitted).

width - the image width.

height - the image height.

Throws:

IOException - if there are any I/O errors.

writeChartAsJPEG

public static void writeChartAsJPEG(OutputStream out,
float quality,
JFreeChart chart,
int width,
int height)
                             throws IOException

Writes a chart to an output stream in JPEG format. Please note that JPEG is a poor format for chart images, use PNG if possible.

Parameters:

out - the output stream (null not permitted).

quality - the quality setting.

chart - the chart (null not permitted).

width - the image width.

height - the image height.

Throws:

IOException - if there are any I/O errors.

writeChartAsJPEG

public static void writeChartAsJPEG(OutputStream out,
JFreeChart chart,
int width,
int height,
ChartRenderingInfo info)
                             throws IOException

Writes a chart to an output stream in JPEG format. This method allows you to pass in a ChartRenderingInfo object, to collect information about the chart dimensions/entities. You will need this info if you want to create an HTML image map.

Parameters:

out - the output stream (null not permitted).

chart - the chart (null not permitted).

width - the image width.

height - the image height.

info - the chart rendering info (null permitted).

Throws:

IOException - if there are any I/O errors.

writeChartAsJPEG

public static void writeChartAsJPEG(OutputStream out,
float quality,
JFreeChart chart,
int width,
int height,
ChartRenderingInfo info)
                             throws IOException

Writes a chart to an output stream in JPEG format. This method allows you to pass in a ChartRenderingInfo object, to collect information about the chart dimensions/entities. You will need this info if you want to create an HTML image map.

Parameters:

out - the output stream (null not permitted).

quality - the output quality (0.0f to 1.0f).

chart - the chart (null not permitted).

width - the image width.

height - the image height.

info - the chart rendering info (null permitted).

Throws:

IOException - if there are any I/O errors.

saveChartAsJPEG

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

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.

Throws:

IOException - if there are any I/O errors.

saveChartAsJPEG

public static void saveChartAsJPEG(File file,
float quality,
JFreeChart chart,
int width,
int height)
                            throws IOException

Saves a chart to a file in JPEG format.

Parameters:

file - the file (null not permitted).

quality - the JPEG quality setting.

chart - the chart (null not permitted).

width - the image width.

height - the image height.

Throws:

IOException - if there are any I/O errors.

saveChartAsJPEG

public static void saveChartAsJPEG(File file,
JFreeChart chart,
int width,
int height,
ChartRenderingInfo info)
                            throws IOException

Saves a chart to a file in JPEG format. This method allows you to pass in a ChartRenderingInfo object, to collect information about the chart dimensions/entities. You will need this info if you want to create an HTML image map.

Parameters:

file - the file name (null not permitted).

chart - the chart (null not permitted).

width - the image width.

height - the image height.

info - the chart rendering info (null permitted).

Throws:

IOException - if there are any I/O errors.

saveChartAsJPEG

public static void saveChartAsJPEG(File file,
float quality,
JFreeChart chart,
int width,
int height,
ChartRenderingInfo info)
                            throws IOException

Saves a chart to a file in JPEG format. This method allows you to pass in a ChartRenderingInfo object, to collect information about the chart dimensions/entities. You will need this info if you want to create an HTML image map.

Parameters:

file - the file name (null not permitted).

quality - the quality setting.

chart - the chart (null not permitted).

width - the image width.

height - the image height.

info - the chart rendering info (null permitted).

Throws:

IOException - if there are any I/O errors.

writeBufferedImageAsJPEG

public static void writeBufferedImageAsJPEG(OutputStream out,
BufferedImage image)
                                     throws IOException

Writes a BufferedImage to an output stream in JPEG format.

Parameters:

out - the output stream (null not permitted).

image - the image (null not permitted).

Throws:

IOException - if there are any I/O errors.

writeBufferedImageAsJPEG

public static void writeBufferedImageAsJPEG(OutputStream out,
float quality,
BufferedImage image)
                                     throws IOException

Writes a BufferedImage to an output stream in JPEG format.

Parameters:

out - the output stream (null not permitted).

quality - the image quality (0.0f to 1.0f).

image - the image (null not permitted).

Throws:

IOException - if there are any I/O errors.

writeBufferedImageAsPNG

public static void writeBufferedImageAsPNG(OutputStream out,
BufferedImage image)
                                    throws IOException

Writes a BufferedImage to an output stream in PNG format.

Parameters:

out - the output stream (null not permitted).

image - the image (null not permitted).

Throws:

IOException - if there are any I/O errors.

writeBufferedImageAsPNG

public static void writeBufferedImageAsPNG(OutputStream out,
BufferedImage image,
boolean encodeAlpha,
int compression)
                                    throws IOException

Writes a BufferedImage to an output stream in PNG format.

Parameters:

out - the output stream (null not permitted).

image - the image (null not permitted).

encodeAlpha - encode alpha?

compression - the compression level (0-9).

Throws:

IOException - if there are any I/O errors.

encodeAsPNG

public static byte[] encodeAsPNG(BufferedImage image)
                          throws IOException

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)
                          throws IOException

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.

writeImageMap

public static void writeImageMap(PrintWriter writer,
String name,
ChartRenderingInfo info,
boolean useOverLibForToolTips)
                          throws IOException

Writes an image map to an output stream.

Parameters:

writer - the writer (null not permitted).

name - the map name (null not permitted).

info - the chart rendering info (null not permitted).

useOverLibForToolTips - whether to use OverLIB for tooltips (http://www.bosrup.com/web/overlib/).

Throws:

IOException - if there are any I/O errors.

writeImageMap

public static void writeImageMap(PrintWriter writer,
String name,
ChartRenderingInfo info,
ToolTipTagFragmentGenerator toolTipTagFragmentGenerator,
URLTagFragmentGenerator urlTagFragmentGenerator)
                          throws IOException

Writes an image map to the specified writer.

Parameters:

writer - the writer (null not permitted).

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).

Throws:

IOException - if there are any I/O errors.

getImageMap

public static String getImageMap(String name,
ChartRenderingInfo info)

Creates an HTML image map. This method maps to ImageMapUtils.getImageMap(String, ChartRenderingInfo, ToolTipTagFragmentGenerator, URLTagFragmentGenerator), 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 ImageMapUtils.getImageMap(String, ChartRenderingInfo, ToolTipTagFragmentGenerator, URLTagFragmentGenerator).

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.