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## java.awt
Class GraphicsConfiguration

    java.lang.Object
      |
      +--java.awt.GraphicsConfiguration

public abstract class GraphicsConfiguration
extends Object

The `GraphicsConfiguration` class describes the characteristics of a graphics destination such as a printer or monitor. There can be many `GraphicsConfiguration` objects associated with a single graphics device, representing different drawing modes or capabilities. The corresponding native structure will vary from platform to platform. For example, on X11 windowing systems, each visual is a different `GraphicsConfiguration`. On Microsoft Windows, `GraphicsConfiguration`s represent PixelFormats available in the current resolution and color depth.

In a virtual device multi-screen environment in which the desktop area could span multiple physical screen devices, the bounds of the `GraphicsConfiguration` objects are relative to the virtual coordinate system. When setting the location of a component, use `getBounds` to get the bounds of the desired `GraphicsConfiguration` and offset the location with the coordinates of the `GraphicsConfiguration`, as the following code sample illustrates:

          Frame f = new Frame(gc);  // where gc is a GraphicsConfiguration
          Rectangle bounds = gc.getBounds();
          f.setLocation(10 + bounds.x, 10 + bounds.y);

To determine if your environment is a virtual device environment, call `getBounds` on all of the `GraphicsConfiguration` objects in your system. If any of the origins of the returned bounds is not (0, 0), your environment is a virtual device environment.

You can also use `getBounds` to determine the bounds of the virtual device. To do this, first call `getBounds` on all of the `GraphicsConfiguration` objects in your system. Then calculate the union of all of the bounds returned from the calls to `getBounds`. The union is the bounds of the virtual device. The following code sample calculates the bounds of the virtual device.

          Rectangle virtualBounds = new Rectangle();
          GraphicsEnvironment ge = GraphicsEnvironment.
                  getLocalGraphicsEnvironment();
          GraphicsDevice[] gs =
                  ge.getScreenDevices();
          for (int j = 0; j < gs.length; j++) {
              GraphicsDevice gd = gs[j];
              GraphicsConfiguration[] gc =
                  gd.getConfigurations();
              for (int i=0; i < gc.length; i++) {
                  virtualBounds =
                      virtualBounds.union(gc[i].getBounds());
              }
          }

See Also:
  `Window`, `Frame`, `GraphicsEnvironment`, `GraphicsDevice`

Constructor Summary
`protected` | `GraphicsConfiguration()` This is an abstract class that cannot be instantiated directly.

Method Summary
`abstract BufferedImage` | `createCompatibleImage(int width, int height)` Returns a `BufferedImage` with a data layout and color model compatible with this `GraphicsConfiguration`.
`abstract BufferedImage` | `createCompatibleImage(int width, int height, int transparency)` Returns a `BufferedImage` that supports the specified transparency and has a data layout and color model compatible with this `GraphicsConfiguration`.
`abstract VolatileImage` | `createCompatibleVolatileImage(int width, int height)` Returns a `VolatileImage` with a data layout and color model compatible with this `GraphicsConfiguration`.
`VolatileImage` | `createCompatibleVolatileImage(int width, int height, ImageCapabilities caps)` Returns a `VolatileImage` with a data layout and color model compatible with this `GraphicsConfiguration`, using the specified image capabilities.
`abstract Rectangle` | `getBounds()` Returns the bounds of the `GraphicsConfiguration` in the device coordinates.
`BufferCapabilities` | `getBufferCapabilities()` Returns the buffering capabilities of this `GraphicsConfiguration`.
`abstract ColorModel` | `getColorModel()` Returns the `ColorModel` associated with this `GraphicsConfiguration`.
`abstract ColorModel` | `getColorModel(int transparency)` Returns the `ColorModel` associated with this `GraphicsConfiguration` that supports the specified transparency.
`abstract AffineTransform` | `getDefaultTransform()` Returns the default `AffineTransform` for this `GraphicsConfiguration`.
`abstract GraphicsDevice` | `getDevice()` Returns the `GraphicsDevice` associated with this `GraphicsConfiguration`.
`ImageCapabilities` | `getImageCapabilities()` Returns the image capabilities of this `GraphicsConfiguration`.
`abstract AffineTransform` | `getNormalizingTransform()` Returns a `AffineTransform` that can be concatenated with the default `AffineTransform` of a `GraphicsConfiguration` so that 72 units in user space equals 1 inch in device space.

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

Constructor Detail

### GraphicsConfiguration

    protected GraphicsConfiguration()

  This is an abstract class that cannot be instantiated directly. Instances must be obtained from a suitable factory or query method.

See Also:
  `GraphicsDevice.getConfigurations()`, `GraphicsDevice.getDefaultConfiguration()`, `GraphicsDevice.getBestConfiguration(java.awt.GraphicsConfigTemplate)`, `Graphics2D.getDeviceConfiguration()`

Method Detail

### getDevice

    public abstract GraphicsDevice getDevice()

  Returns the `GraphicsDevice` associated with this `GraphicsConfiguration`.

  Returns:
    a `GraphicsDevice` object that is associated with this `GraphicsConfiguration`.

### createCompatibleImage

    public abstract BufferedImage createCompatibleImage(int width,
                                                        int height)

  Returns a `BufferedImage` with a data layout and color model compatible with this `GraphicsConfiguration`. This method has nothing to do with memory-mapping a device. The returned `BufferedImage` has a layout and color model that is closest to this native device configuration and can therefore be optimally blitted to this device.

  Parameters:
    `width` - the width of the returned `BufferedImage`
    `height` - the height of the returned `BufferedImage`
  Returns:
    a `BufferedImage` whose data layout and color model is compatible with this `GraphicsConfiguration`.

### createCompatibleVolatileImage

    public abstract VolatileImage createCompatibleVolatileImage(int width,
                                                                int height)

  Returns a `VolatileImage` with a data layout and color model compatible with this `GraphicsConfiguration`. The returned `VolatileImage` may have data that is stored optimally for the underlying graphics device and may therefore benefit from platform-specific rendering acceleration.

  Parameters:
    `width` - the width of the returned `VolatileImage`
    `height` - the height of the returned `VolatileImage`
  Returns:
    a `VolatileImage` whose data layout and color model is compatible with this `GraphicsConfiguration`.
  See Also:
    `Component.createVolatileImage(int, int)`

### createCompatibleVolatileImage

    public VolatileImage createCompatibleVolatileImage(int width,
                                                       int height,
                                                       ImageCapabilities caps)
                                                throws AWTException

  Returns a `VolatileImage` with a data layout and color model compatible with this `GraphicsConfiguration`, using the specified image capabilities. The returned `VolatileImage` has a layout and color model that is closest to this native device configuration and can therefore be optimally blitted to this device.

  Parameters:
    `width` - the width of the returned `VolatileImage`
    `height` - the height of the returned `VolatileImage`
    `caps` - the image capabilities
  Returns:
    a `VolatileImage` whose data layout and color model is compatible with this `GraphicsConfiguration`.
  Throws:
    `AWTException` - if the supplied image capabilities could not be met by this graphics configuration
  Since:
    1.4

### createCompatibleImage

    public abstract BufferedImage createCompatibleImage(int width,
                                                        int height,
                                                        int transparency)

  Returns a `BufferedImage` that supports the specified transparency and has a data layout and color model compatible with this `GraphicsConfiguration`. This method has nothing to do with memory-mapping a device. The returned `BufferedImage` has a layout and color model that can be optimally blitted to a device with this `GraphicsConfiguration`.

  Parameters:
    `width` - the width of the returned `BufferedImage`
    `height` - the height of the returned `BufferedImage`
    `transparency` - the specified transparency mode
  Returns:
    a `BufferedImage` whose data layout and color model is compatible with this `GraphicsConfiguration` and also supports the specified transparency.
  See Also:
    `Transparency.OPAQUE`, `Transparency.BITMASK`, `Transparency.TRANSLUCENT`

### getColorModel

    public abstract ColorModel getColorModel()

  Returns the `ColorModel` associated with this `GraphicsConfiguration`.

  Returns:
    a `ColorModel` object that is associated with this `GraphicsConfiguration`.

### getColorModel

    public abstract ColorModel getColorModel(int transparency)

  Returns the `ColorModel` associated with this `GraphicsConfiguration` that supports the specified transparency.

  Parameters:
    `transparency` - the specified transparency mode
  Returns:
    a `ColorModel` object that is associated with this `GraphicsConfiguration` and supports the specified transparency.

### getDefaultTransform

    public abstract AffineTransform getDefaultTransform()

  Returns the default `AffineTransform` for this `GraphicsConfiguration`. This `AffineTransform` is typically the Identity transform for most normal screens. The default `AffineTransform` maps coordinates onto the device such that 72 user space coordinate units measure approximately 1 inch in device space. The normalizing transform can be used to make this mapping more exact. Coordinates in the coordinate space defined by the default `AffineTransform` for screen and printer devices have the origin in the upper left-hand corner of the target region of the device, with X coordinates increasing to the right and Y coordinates increasing downwards. For image buffers not associated with a device, such as those not created by `createCompatibleImage`, this `AffineTransform` is the Identity transform.

  Returns:
    the default `AffineTransform` for this `GraphicsConfiguration`.

### getNormalizingTransform

    public abstract AffineTransform getNormalizingTransform()

  Returns a `AffineTransform` that can be concatenated with the default `AffineTransform` of a `GraphicsConfiguration` so that 72 units in user space equals 1 inch in device space.

  For a particular `Graphics2D`, g, one can reset the transformation to create such a mapping by using the following pseudocode:

            GraphicsConfiguration gc = g.getGraphicsConfiguration();

            g.setTransform(gc.getDefaultTransform());
            g.transform(gc.getNormalizingTransform());

  Note that sometimes this `AffineTransform` is identity, such as for printers or metafile output, and that this `AffineTransform` is only as accurate as the information supplied by the underlying system. For image buffers not associated with a device, such as those not created by `createCompatibleImage`, this `AffineTransform` is the Identity transform since there is no valid distance measurement.

  Returns:
    an `AffineTransform` to concatenate to the default `AffineTransform` so that 72 units in user space is mapped to 1 inch in device space.

### getBounds

    public abstract Rectangle getBounds()

  Returns the bounds of the `GraphicsConfiguration` in the device coordinates. In a multi-screen environment with a virtual device, the bounds can have negative X or Y origins.

  Returns:
    the bounds of the area covered by this `GraphicsConfiguration`.
  Since:
    1.3

### getBufferCapabilities

    public BufferCapabilities getBufferCapabilities()

  Returns the buffering capabilities of this `GraphicsConfiguration`.

  Returns:
    the buffering capabilities of this graphics configuration object
  Since:
    1.4

### getImageCapabilities

    public ImageCapabilities getImageCapabilities()

  Returns the image capabilities of this `GraphicsConfiguration`.

  Returns:
    the image capabilities of this graphics configuration object
  Since:
    1.4

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.