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Showing content from https://docs.oracle.com/en/java/javase/19/docs/api/java.desktop/java/awt/GraphicsEnvironment.html below:

GraphicsEnvironment (Java SE 19 & JDK 19)

The

class describes the collection of

objects and

objects available to a Java(tm) application on a particular platform. The resources in this

might be local or on a remote machine.

objects can be screens, printers or image buffers and are the destination of

drawing methods. Each

has a number of

objects associated with it. These objects specify the different configurations in which the

can be used.

See Also:

• GraphicsDevice
• GraphicsConfiguration

• Constructor Summary

  Constructors

  protected

  This is an abstract class and cannot be instantiated directly.

• Method Summary

  Returns a

  Graphics2D

  object for rendering into the specified

  BufferedImage

  .

  Returns an array containing a one-point size instance of all fonts available in this GraphicsEnvironment.

  Returns an array containing the names of all font families in this GraphicsEnvironment localized for the default locale, as returned by Locale.getDefault().

  Returns an array containing the names of all font families in this GraphicsEnvironment localized for the specified locale.

  Returns the Point where Windows should be centered.

  Returns the default screen GraphicsDevice.

  Returns the local GraphicsEnvironment.

  Returns the maximum bounds for centered Windows.

  Returns an array of all of the screen GraphicsDevice objects.

  static boolean

  Tests whether or not a display, keyboard, and mouse can be supported in this environment.

  boolean

  Returns whether or not a display, keyboard, and mouse can be supported in this graphics environment.

  void

  Indicates a preference for locale-specific fonts in the mapping of logical fonts to physical fonts.

  void

  Indicates a preference for proportional over non-proportional (for example dual-spaced CJK fonts) fonts in the mapping of logical fonts to physical fonts.

  boolean

  Registers a created Font in this GraphicsEnvironment.

  Methods declared in class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• Constructor Details
  • GraphicsEnvironment

    protected GraphicsEnvironment()

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

• Method Details
  • getLocalGraphicsEnvironment

    Returns the local GraphicsEnvironment.

    Returns:

    the local GraphicsEnvironment

  • isHeadless

    public static boolean isHeadless()

    Tests whether or not a display, keyboard, and mouse can be supported in this environment. If this method returns true, a HeadlessException is thrown from areas of the Toolkit and GraphicsEnvironment that are dependent on a display, keyboard, or mouse.

    Returns:

    true if this environment cannot support a display, keyboard, and mouse; false otherwise

    Since:

    1.4

    See Also:

    • HeadlessException

  • isHeadlessInstance

    public boolean isHeadlessInstance()

    Returns whether or not a display, keyboard, and mouse can be supported in this graphics environment. If this returns true, HeadlessException will be thrown from areas of the graphics environment that are dependent on a display, keyboard, or mouse.

    Returns:

    true if a display, keyboard, and mouse can be supported in this environment; false otherwise

    Since:

    1.4

    See Also:

    • HeadlessException
    • isHeadless()

  • getScreenDevices

    Returns an array of all of the screen GraphicsDevice objects.

    Returns:

    an array containing all the GraphicsDevice objects that represent screen devices

    Throws:

    HeadlessException - if isHeadless() returns true

    See Also:

    • isHeadless()

  • getDefaultScreenDevice

    Returns the default screen GraphicsDevice.

    Returns:

    the GraphicsDevice that represents the default screen device

    Throws:

    HeadlessException - if isHeadless() returns true

    See Also:

    • isHeadless()

  • createGraphics

    Returns a

    Graphics2D

    object for rendering into the specified

    BufferedImage

    .

    Parameters:

    img - the specified BufferedImage

    Returns:

    a Graphics2D to be used for rendering into the specified BufferedImage

    Throws:

    NullPointerException - if img is null

  • getAllFonts public abstract Font[] getAllFonts

    ()

    Returns an array containing a one-point size instance of all fonts available in this

    GraphicsEnvironment

    . Typical usage would be to allow a user to select a particular font. Then, the application can size the font and set various font attributes by calling the

    deriveFont

    method on the chosen instance.

    This method provides for the application the most precise control over which Font instance is used to render text. If a font in this GraphicsEnvironment has multiple programmable variations, only one instance of that Font is returned in the array, and other variations must be derived by the application.

    If a font in this environment has multiple programmable variations, such as Multiple-Master fonts, only one instance of that font is returned in the Font array. The other variations must be derived by the application.

    Returns:

    an array of Font objects

    Since:

    1.2

    See Also:

    • getAvailableFontFamilyNames()
    • Font
    • Font.deriveFont(int, float)
    • Font.getFontName()

  • getAvailableFontFamilyNames public abstract String[] getAvailableFontFamilyNames

    ()

    Returns an array containing the names of all font families in this

    GraphicsEnvironment

    localized for the default locale, as returned by

    Locale.getDefault()

    .

    Typical usage would be for presentation to a user for selection of a particular family name. An application can then specify this name when creating a font, in conjunction with a style, such as bold or italic, giving the font system flexibility in choosing its own best match among multiple fonts in the same font family.

    Returns:

    an array of String containing font family names localized for the default locale, or a suitable alternative name if no name exists for this locale.

    Since:

    1.2

    See Also:

    • getAllFonts()
    • Font
    • Font.getFamily()

  • getAvailableFontFamilyNames public abstract String[] getAvailableFontFamilyNames(Locale l)

    Returns an array containing the names of all font families in this

    GraphicsEnvironment

    localized for the specified locale.

    Typical usage would be for presentation to a user for selection of a particular family name. An application can then specify this name when creating a font, in conjunction with a style, such as bold or italic, giving the font system flexibility in choosing its own best match among multiple fonts in the same font family.

    Parameters:

    l - a Locale object that represents a particular geographical, political, or cultural region. Specifying null is equivalent to specifying Locale.getDefault().

    Returns:

    an array of String containing font family names localized for the specified Locale, or a suitable alternative name if no name exists for the specified locale.

    Since:

    1.2

    See Also:

    • getAllFonts()
    • Font
    • Font.getFamily()

  • registerFont public boolean registerFont(Font font)

    Registers a

    created Font

    in this

    GraphicsEnvironment

    . A created font is one that was returned from calling

    Font.createFont(int, java.io.InputStream)

    , or derived from a created font by calling

    Font.deriveFont(int, float)

    . After calling this method for such a font, it is available to be used in constructing new

    Font

    s by name or family name, and is enumerated by

    getAvailableFontFamilyNames()

    and

    getAllFonts()

    within the execution context of this application or applet. This means applets cannot register fonts in a way that they are visible to other applets.

    Reasons that this method might not register the font and therefore return false are:

    • The font is not a created Font.
    • The font conflicts with a non-created Font already in this GraphicsEnvironment. For example if the name is that of a system font, or a logical font as described in the documentation of the Font class. It is implementation dependent whether a font may also conflict if it has the same family name as a system font.

      Notice that an application can supersede the registration of an earlier created font with a new one.

    Parameters:

    font - the font to be registered

    Returns:

    true if the font is successfully registered in this GraphicsEnvironment.

    Throws:

    NullPointerException - if font is null

    Since:

    1.6

  • preferLocaleFonts

    public void preferLocaleFonts()

    The actual change in font rendering behavior resulting from a call to this method is implementation dependent; it may have no effect at all, or the requested behavior may already match the default behavior. The behavior may differ between font rendering in lightweight and peered components. Since calling this method requests a different font, clients should expect different metrics, and may need to recalculate window sizes and layout. Therefore this method should be called before user interface initialisation.

    Since:

    1.5

  • preferProportionalFonts

    public void preferProportionalFonts()

    The actual change in font rendering behavior resulting from a call to this method is implementation dependent; it may have no effect at all. The behavior may differ between font rendering in lightweight and peered components. Since calling this method requests a different font, clients should expect different metrics, and may need to recalculate window sizes and layout. Therefore this method should be called before user interface initialisation.

    Since:

    1.5

  • getCenterPoint

    Returns the Point where Windows should be centered. It is recommended that centered Windows be checked to ensure they fit within the available display area using getMaximumWindowBounds().

    Returns:

    the point where Windows should be centered

    Throws:

    HeadlessException - if isHeadless() returns true

    Since:

    1.4

    See Also:

    • getMaximumWindowBounds()

  • getMaximumWindowBounds

    To get the usable bounds of a single display, use GraphicsConfiguration.getBounds() and Toolkit.getScreenInsets().

    Returns:

    the maximum bounds for centered Windows

    Throws:

    HeadlessException - if isHeadless() returns true

    Since:

    1.4

    See Also:

    • getCenterPoint()
    • GraphicsConfiguration.getBounds()
    • Toolkit.getScreenInsets(java.awt.GraphicsConfiguration)

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