y.io
Class JPGIOHandler

java.lang.Object
  |
  +--y.io.IOHandler
        |
        +--y.io.ImageOutputHandler
              |
              +--y.io.JPGIOHandler

public class JPGIOHandler

extends ImageOutputHandler

Writes a Graph2D in JPG image format. The encoding process is done in two steps. First the graph will be renderer to an image. Rendering upon an image is done by calling method Graph2DView.paintVisibleContent(Graphics2D) on the current view of the Graph2D. Configuring the view influences size, viewport, background, etc. of the rendered image. In the second step the image is taken and encoded to the output format.

Constructor Summary

JPGIOHandler()
Instantiates a new JPGIOHandler.

Method Summary

protected BufferedImage	createImage(int width, int height) Creates the buffered image on which the graph will be rendered.
protected void	encode(BufferedImage img, OutputStream out) Encodes the given image to the given output stream.
String	getFileFormatString() Returns the JPG file format string.
String	getFileNameExtension() Returns the JPG file name extension, i.e.
float	getQuality() Returns the quality level of JPG encoding.
void	setQuality(float quality) Sets the quality level of JPG encoding.

Methods inherited from class y.io.ImageOutputHandler

canRead, createDefaultGraph2DView, isAntialiasingEnabled, read, setAntialiasingEnabled, write

Methods inherited from class y.io.IOHandler

canWrite, canWriteSubset, createObjectInputStream, createObjectOutputStream, hide, read, read, shouldSerialize, shouldSerialize, write, writeSubset, writeSubset

Methods inherited from class java.lang.Object

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

Constructor Detail

JPGIOHandler

public JPGIOHandler()

Instantiates a new JPGIOHandler.

Method Detail

getFileFormatString

public String getFileFormatString()

Returns the JPG file format string.

Specified by:

getFileFormatString in class IOHandler

getFileNameExtension

public String getFileNameExtension()

Returns the JPG file name extension, i.e. "jpg"

Specified by:

getFileNameExtension in class IOHandler

createImage

protected BufferedImage createImage(int width,
                                    int height)

Description copied from class: ImageOutputHandler

Creates the buffered image on which the graph will be rendered.

Specified by:

createImage in class ImageOutputHandler

encode

protected void encode(BufferedImage img,
                      OutputStream out)
               throws IOException

Description copied from class: ImageOutputHandler

Encodes the given image to the given output stream.

Specified by:

encode in class ImageOutputHandler

IOException

setQuality

public void setQuality(float quality)

Sets the quality level of JPG encoding. At a quality level of 1.0 the encoding will lead to no loss of data due to quantization. The lower the level the more loss of data will occur. By default a setting of 1.0 (no loss) is used.

Parameters:

quality - a value between 0.0 and 1.0

getQuality

public float getQuality()

Returns the quality level of JPG encoding.