Re: click inside a region

From:

"David Ching" <dc@remove-this.dcsoft.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 1 Jul 2009 18:26:34 -0700

Message-ID:

<20ACA0F9-B10F-49E9-91E9-82AD3770C9B5@microsoft.com>

"vvf" <vvf@vvf.com> wrote in message
news:uY1QIbi%23JHA.4984@TK2MSFTNGP05.phx.gbl...

Thank you David and... David. :)

This is a very interesting idea. Using this idea, after detecting the
country that I'm hovering over, in order to highlight it with a different
color I would then select a big enough region around the area that I'm
currently at, iterate through it, compare the pixel colors and basically
replace all the pixels coresponding to my current country with a color
representing the highlight, correct? hmm.. or maybe, I should have a 3d
image with all the countries highlighted and then BitBlt the region
coresponding to my country, from the highlighted dc to the normal one...
this way it may be more efficient... would this be a good idea?

I would create a new image for each country. The image would have the
country highlighted. And the rest of the pixels in the image would be
transparent. Then I would transparently blt the image corresponding to the
clicked country over the visible map.

Of course if you need to support resizing, none of this will work (since the
images assume fixed size). But these techniques work well for fixed size.

-- David