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## weka.gui.visualize
Class PNGWriter

    java.lang.Object
      weka.gui.visualize.JComponentWriter
          weka.gui.visualize.PNGWriter

    public class PNGWriter

extends JComponentWriter

This class takes any JComponent and outputs it to a PNG-file. Scaling is by default disabled, since we always take a screenshot.

Version:
  $Revision: 5920 $
Author:
  fracpete (fracpete at waikato dot ac dot nz)

Constructor Summary
`PNGWriter()` initializes the object.
`PNGWriter(javax.swing.JComponent c)` initializes the object with the given Component.
`PNGWriter(javax.swing.JComponent c, java.io.File f)` initializes the object with the given Component and filename.

Method Summary
`void` | `generateOutput()` generates the actual output.
`java.awt.Color` | `getBackground()` returns the current background color.
`java.lang.String` | `getDescription()` returns the name of the writer, to display in the FileChooser.
`java.lang.String` | `getExtension()` returns the extension (incl.
`void` | `initialize()` further initialization.
`static void` | `main(java.lang.String[] args)` for testing only.
`void` | `setBackground(java.awt.Color c)` sets the background color to use in creating the PNG.

Methods inherited from class weka.gui.visualize.JComponentWriter
`getComponent, getCustomHeight, getCustomWidth, getFile, getScalingEnabled, getUseCustomDimensions, getXScale, getYScale, setComponent, setCustomHeight, setCustomWidth, setFile, setScale, setScalingEnabled, setUseCustomDimensions, toOutput, toOutput, toOutput`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### PNGWriter

    public PNGWriter()

  initializes the object.

### PNGWriter

    public PNGWriter(javax.swing.JComponent c)

  initializes the object with the given Component.

  Parameters:
    `c` - the component to print in the output format

### PNGWriter

    public PNGWriter(javax.swing.JComponent c,
                     java.io.File f)

  initializes the object with the given Component and filename.

  Parameters:
    `c` - the component to print in the output format
    `f` - the file to store the output in

Method Detail

### initialize

    public void initialize()

  further initialization.

### getDescription

    public java.lang.String getDescription()

  returns the name of the writer, to display in the FileChooser. must be overridden in the derived class.

  Specified by:
    `getDescription` in class `JComponentWriter`
  Returns:
    the name of the writer

### getExtension

    public java.lang.String getExtension()

  returns the extension (incl. ".") of the output format, to use in the FileChooser.

  Specified by:
    `getExtension` in class `JComponentWriter`
  Returns:
    the file extension

### getBackground

    public java.awt.Color getBackground()

  returns the current background color.

  Returns:
    the current background color

### setBackground

    public void setBackground(java.awt.Color c)

  sets the background color to use in creating the PNG.

  Parameters:
    `c` - the color to use for background

### generateOutput

    public void generateOutput()
                        throws java.lang.Exception

  generates the actual output.

  Throws:
    `java.lang.Exception` - if something goes wrong

### main

    public static void main(java.lang.String[] args)
                     throws java.lang.Exception

  for testing only.

  Parameters:
    `args` - the commandline arguments
  Throws:
    `java.lang.Exception` - if something goes wrong

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