This section will tell you what is actually accomplished by the code you may have already seen. The next one will discuss the code itself. Ok, here is what we need to do:

Firstly, we need to have the image of what's behind our window. We will store it in a compatible DC and later copy parts of it. To get this image, we will move the form outside the window, then copy the area of the Desktop where our window was into our compatible DC and then move our window back to its place.

We also need a picture which will cover the whole window of ours. This picture will have the same outlook as our form. To do this, we must have the picture initially hidden, then copy the area of the Desktop DC into a temporary memory DC. Next, display the picture above all form controls and copy the contents of the temporary memory DC onto it.

So far, we have our form cover completely by a picture that simulates the form and a compatible DC containing the Desktop behind our window.

Here is the place to show some creativity. The example simply copies random squares from the memory DC onto the picture, but you may surely think out a more interesting effect.

And after some loops, we end our application. This is it. It's not that hard, is it?

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Copyright (c) 1999, Billy&George Software and Peter Dimitrov
Revised May 1999