| sun.porting.graphicssystem.GeometryProvider
| GeometryProvider | | public interface GeometryProvider extends sun.awt.DrawingSurfaceInfo(Code) | | The GeometryProvider interface is what allows a Graphics
object to clip to a window. Each time a Graphics object is used for
a draw, it is required to consult its associated GeometryProvider in
order to first lock the drawing surface, and then obtain the
current transformation and clipping information for the operation.
If the drawing surface is an offscreen image, the implementation of
the GeometryProvider interface is trivial; if it is a window, the
window system lock, window's onscreen location, current clip area
and background are made available via this interface.
version:
1.7, 08/19/02 |
| getBackgroundColor | | java.awt.Color getBackgroundColor()(Code) | | Get the background color, if any, that this object is
supposed to have. This allows surfaces to stack in either
an opaque or a transparent manner (a return value of null
indicates that the object is transparent).
A java.awt.Color object describing the background color for the drawing surface. |
| getLock | | Object getLock()(Code) | | Get the lock object associated with the
GeometryProvider. All operations must acquire
this lock as the first thing they do, and hold
the lock until the draw has been completed. If the object
being drawn is a window, this can prevent the windows from
being moved during the draw; in any case it also prevents more
than one thread from drawing to the same object at the same
time.
An Object to be used as the lock for the current draw operation. |
| getValidationID | | int getValidationID()(Code) | | Get the validation identifier. This is the same number that is
returned by lock(); if it has not changed since the previous
acquisition of the lock, the clipping information can be assumed
not to have changed.
The change identifier. |
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