You can do this by setting the composite of the graphics object
(setComposite) to an AlphaComposite. Then simply paint a white rectangle
onto the area you wish to highlight.
e.g.
Graphics2D g = ...;
Composite savedComposite = g.getComposite();
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,.5f);
g.fillRect(x,y,width,height);
g.setComposite(savedComposite);
>>> Laura Paterson <laura.paterson_at_generaldynamics.uk.com> 11/10/04 6:30
AM >>>
Hi,
I think this is possibly more of a Java question than a map question,
but
hope that someone in this forum may know of a solution!
Part of my map application allows a user to draw an area of interest
onto
the map. I used to indicate the boundary of this area by colouring it
transparently, however, I received complaints that this interfered with
using the map too much.
After trying a few prototypes, I have found the effect I want to achieve
-
to brighten the selected area. (See the attached screenshot mock, which
I
made up using the Brighten option in Paint Shop Pro 7.)
The problem is, I have no idea at the moment how to go about creating
this
effect in OpenMap/Java...
If anyone has any suggestions I will be very grateful!
Cheers,
Laura
General Dynamics United Kingdom Limited
Registered in England and Wales No. 1911653
Registered Office: 100 New Bridge Street, London, EC4V 6JA
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Received on Wed Nov 10 2004 - 12:02:46 EST