This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
Hi Im creating an app where I need that a rectangle be visible all the time over the background. So I created this:
But in this example the rectangle is draw using white color. How can I do something like a xor that react with the background color to make this rectangle visible with any background?
Thanks in advance!