Editing Java 2D (section)

==Advanced objects==
These objects can be viewed as performing their duties in terms of the simpler objects described above.

===Transform===
Every Java 2D operation is subject to a [[Affine transformation|transform]], so that shapes may be translated, rotated, sheared, and scaled as they are drawn.  The active transform is most often the '''identity transform''', which does nothing.

Filling using a transform can be viewed as simply creating a new, transformed shape and then filling that shape.

===Stroke===
In addition to the ''fill'' operation, Java 2D provides a ''draw'' operation.  While fill draws the interior of a shape, draw draws its outline.  The outline can be as simple as a thin line, or as complicated as a dashed line with each dash having rounded edges.

The object responsible for generating the outline is the ''stroke''.  Given an input shape, the stroke produces a new shape representing its outline.  For instance, an infinitely thin line segment (with no interior) might be stroked into a one-pixel-wide rectangle.

A draw operation can therefore be described as creating a new, stroked object and then filling that object.

Technically speaking, the stroke is only required to accept an input shape and produce a new shape.  The stroke implementation provided with Java 2D implements the outline rules described above, but a custom-written stroke could produce any shape it wished.