The
GraphicsDevice
class describes the graphics devices that might be available in a particular graphics environment. These include screen and printer devices. Note that there can be many screens and many printers in an instance of
GraphicsEnvironment
. Each graphics device has one or more
GraphicsConfiguration
objects associated with it. These objects specify the different configurations in which the
GraphicsDevice
can be used.
In a multi-screen environment, the GraphicsConfiguration objects can be used to render components on multiple screens. The following code sample demonstrates how to create a JFrame object for each GraphicsConfiguration on each screen device in the GraphicsEnvironment:
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++) {
JFrame f = new
JFrame(gs[j].getDefaultConfiguration());
Canvas c = new Canvas(gc[i]);
Rectangle gcBounds = gc[i].getBounds();
int xoffs = gcBounds.x;
int yoffs = gcBounds.y;
f.getContentPane().add(c);
f.setLocation((i*50)+xoffs, (i*60)+yoffs);
f.show();
}
}
For more information on full-screen exclusive mode API, see the Full-Screen Exclusive Mode API Tutorial.
Nested Classes
static enum
Kinds of translucency supported by the underlying system.
Fields
static final int
Device is an image buffer.
static final int
static final int
Device is a raster screen.
Constructors
protected
This is an abstract class that cannot be instantiated directly.
int
This method returns the number of bytes available in accelerated memory on this device.
Returns all of the GraphicsConfiguration objects associated with this GraphicsDevice.
Returns the default GraphicsConfiguration associated with this GraphicsDevice.
Returns the current display mode of this GraphicsDevice.
Returns all display modes available for this GraphicsDevice.
Returns the Window object representing the full-screen window if the device is in full-screen mode.
Returns the identification string associated with this GraphicsDevice.
abstract int
Returns the type of this GraphicsDevice.
boolean
Returns true if this GraphicsDevice supports low-level display changes.
boolean
Returns true if this GraphicsDevice supports full-screen exclusive mode.
boolean
Returns whether the given level of translucency is supported by this graphics device.
void
Sets the display mode of this graphics device.
void
Enter full-screen mode, or return to windowed mode.
Methods declared in class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitpublic static final int TYPE_RASTER_SCREEN
Device is a raster screen.
public static final int TYPE_PRINTER
Device is a printer.
public static final int TYPE_IMAGE_BUFFER
Device is an image buffer. This buffer can reside in device or system memory but it is not physically viewable by the user.
protected GraphicsDevice()
This is an abstract class that cannot be instantiated directly. Instances must be obtained from a suitable factory or query method.
public abstract int getType()
Returns the type of this GraphicsDevice.
GraphicsDevice, which can either be TYPE_RASTER_SCREEN, TYPE_PRINTER or TYPE_IMAGE_BUFFER.
()
Returns the identification string associated with this
GraphicsDevice
.
A particular program might use more than one GraphicsDevice in a GraphicsEnvironment. This method returns a String identifying a particular GraphicsDevice in the local GraphicsEnvironment. Although there is no public method to set this String, a programmer can use the String for debugging purposes. Vendors of the Java Runtime Environment can format the return value of the String. To determine how to interpret the value of the String, contact the vendor of your Java Runtime. To find out who the vendor is, from your program, call the getProperty method of the System class with "java.vendor".
String that is the identification of this GraphicsDevice.
Returns all of the GraphicsConfiguration objects associated with this GraphicsDevice.
GraphicsConfiguration objects that are associated with this GraphicsDevice.
Returns the default GraphicsConfiguration associated with this GraphicsDevice.
GraphicsConfiguration of this GraphicsDevice.
gct - the GraphicsConfigTemplate object used to obtain a valid GraphicsConfiguration
GraphicsConfiguration that passes the criteria defined in the specified GraphicsConfigTemplate.
public boolean isFullScreenSupported()
Returns true if this GraphicsDevice supports full-screen exclusive mode. If a SecurityManager is installed, its checkPermission method will be called with AWTPermission("fullScreenExclusive"). isFullScreenSupported returns true only if that permission is granted.
Enter full-screen mode, or return to windowed mode. The entered full-screen mode may be either exclusive or simulated. Exclusive mode is only available if
isFullScreenSupported
returns
true
.
Exclusive mode implies:
Component.enableInputMethods(false) to make a component a non-client of the input method framework.The simulated full-screen mode places and resizes the window to the maximum possible visible area of the screen. However, the native windowing system may modify the requested geometry-related data, so that the Window object is placed and sized in a way that corresponds closely to the desktop settings.
When entering full-screen mode, if the window to be used as a full-screen window is not visible, this method will make it visible. It will remain visible when returning to windowed mode.
When entering full-screen mode, all the translucency effects are reset for the window. Its shape is set to null, the opacity value is set to 1.0f, and the background color alpha is set to 255 (completely opaque). These values are not restored when returning to windowed mode.
It is unspecified and platform-dependent how decorated windows operate in full-screen mode. For this reason, it is recommended to turn off the decorations in a Frame or Dialog object by using the setUndecorated method.
When returning to windowed mode from an exclusive full-screen window, any display changes made by calling setDisplayMode are automatically restored to their original state.
w - a window to use as the full-screen window; null if returning to windowed mode. Some platforms expect the fullscreen window to be a top-level component (i.e., a Frame); therefore it is preferable to use a Frame here rather than a Window.
()
Returns the Window object representing the full-screen window if the device is in full-screen mode.
null if the device is not in full-screen mode.
public boolean isDisplayChangeSupported()
Returns
true
if this
GraphicsDevice
supports low-level display changes. On some platforms low-level display changes may only be allowed in full-screen exclusive mode (i.e., if
isFullScreenSupported()
returns
true
and the application has already entered full-screen mode using
setFullScreenWindow(java.awt.Window)
).
Sets the display mode of this graphics device. This is only allowed if
isDisplayChangeSupported()
returns
true
and may require first entering full-screen exclusive mode using
setFullScreenWindow(java.awt.Window)
providing that full-screen exclusive mode is supported (i.e.,
isFullScreenSupported()
returns
true
).
The display mode must be one of the display modes returned by getDisplayModes(), with one exception: passing a display mode with DisplayMode.REFRESH_RATE_UNKNOWN refresh rate will result in selecting a display mode from the list of available display modes with matching width, height and bit depth. However, passing a display mode with DisplayMode.BIT_DEPTH_MULTI for bit depth is only allowed if such mode exists in the list returned by getDisplayModes().
Example code:
Frame frame;
DisplayMode newDisplayMode;
GraphicsDevice gd;
// create a Frame, select desired DisplayMode from the list of modes
// returned by gd.getDisplayModes() ...
if (gd.isFullScreenSupported()) {
gd.setFullScreenWindow(frame);
} else {
// proceed in non-full-screen mode
frame.setSize(...);
frame.setLocation(...);
frame.setVisible(true);
}
if (gd.isDisplayChangeSupported()) {
gd.setDisplayMode(newDisplayMode);
}
dm - The new display mode of this graphics device.
IllegalArgumentException - if the DisplayMode supplied is null, or is not available in the array returned by getDisplayModes
UnsupportedOperationException - if isDisplayChangeSupported returns false
Returns the current display mode of this
GraphicsDevice
. The returned display mode is allowed to have a refresh rate
DisplayMode.REFRESH_RATE_UNKNOWN
if it is indeterminate. Likewise, the returned display mode is allowed to have a bit depth
DisplayMode.BIT_DEPTH_MULTI
if it is indeterminate or if multiple bit depths are supported.
Returns all display modes available for this
GraphicsDevice
. The returned display modes are allowed to have a refresh rate
DisplayMode.REFRESH_RATE_UNKNOWN
if it is indeterminate. Likewise, the returned display modes are allowed to have a bit depth
DisplayMode.BIT_DEPTH_MULTI
if it is indeterminate or if multiple bit depths are supported.
public int getAvailableAcceleratedMemory()
This method returns the number of bytes available in accelerated memory on this device. Some images are created or cached in accelerated memory on a first-come, first-served basis. On some operating systems, this memory is a finite resource. Calling this method and scheduling the creation and flushing of images carefully may enable applications to make the most efficient use of that finite resource.
Note that the number returned is a snapshot of how much memory is available; some images may still have problems being allocated into that memory. For example, depending on operating system, driver, memory configuration, and thread situations, the full extent of the size reported may not be available for a given image. There are further inquiry methods on the
ImageCapabilities
object associated with a VolatileImage that can be used to determine whether a particular VolatileImage has been created in accelerated memory.
Returns whether the given level of translucency is supported by this graphics device.
translucencyKind - a kind of translucency support
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