I believe that shape is this context is a reference to a Graphics2D shape.
XOR drawing is an old trick to erase the previously drawn item when doing interactive "rubber-band" drawing. It has the property that any value you XOR with can be restored by a second XOR operation.
If you are doing selection, I would study the SelectTool. Selection tools often do XOR drawing to give a visual display of the fence being dragged around objects.
regards,
Larry
On 8/31/06, Sunburned Surveyor <[EMAIL PROTECTED]> wrote:
When the AbstractCursorTool class makes reference to a "Shape", does
it mean the Java Shape object being drawn on the screen? (As an
example, the line drawn on the screen as a user picks points with the
CursorTool that allows the user to create new Features with a
LineString geomtry?)
If this is the case, am I correct to conclude that not all CursorTool
implementations draw a shape? If I am implementing a CursorTool that
doesn't need to paint graphics on the screen, should I not extend this
class?
Also, Jon says in his comment near the class declaration that this
class is "A tool that draws an XOR visual indicator. Subclasses need
not keep track of the XOR state of the indicator -- that logic is all
handled by this class. Even if the LayerViewPanel is repainted while
the XOR indicator is on-screen."
What does Jon mean when he says an "XOR visual indicator"?
Thanks,
The Sunburned Surveyor
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