Java Reference
In-Depth Information
return;
}
}
System.out.println("no virtual device environment
detected");
}
}
}
Assuming that the environment is a virtual device environment, you can create
Frame
,
javax.swing.JFrame
,
Window
,or
javax.swing.JWindow
contain-
erwindowsthatrefertodifferentgraphicsdevicesbycallingappropriateconstructors,
such as
Frame(GraphicsConfiguration gc)
.
Inamultiscreenenvironmentinwhichthedesktopareacouldspanmultiplephysical
screendevices,theboundsof
GraphicsConfiguration
objectsarerelativetothe
virtualcoordinatesystem.Whensettingthelocationofacomponentinthiscoordinate
system,use
getBounds()
togettheboundsofthedesired
GraphicsConfigur-
ation
and offset the location with these coordinates, as the following example illus-
trates:
Frame f = new Frame(gc); // Assume gc is a GraphicsConfig-
uration instance.
Rectangle bounds = gc.getBounds();
f.setLocation(10+bounds.x, 10+bounds.y);
Graphics2D
Java 2D's abstract
Graphics2D
class (a
Graphics
subclass) describes a
logical
drawing surface
on which
graphics primitives
(2D shapes [such as rectangles and el-
lipses], text, and images) are drawn.
The logical drawing surface is associated with
user space
, which is a 2D Cartesian
(x/y)planewhosepixelsareknownas
logical pixels
,andwhichhavefloating-pointco-
ordinates.Asaresult,various
Graphics2D
methodsacceptfloating-pointcoordinate
values;forexample,
void drawString(String str, float x, float y)
.
WhilediscussingAWTgraphics,Ipreviouslymentionedthata
Graphics
subclass
instance is passed to a component's
paint()
method. Prior to Java 1.2, this was
alwaysthecase.StartingwithJava1.2,a
Graphics2D
subclassinstanceispassedto
