OK, I just installed a Tortoise git in my PC. And I’m quiet amuse about the water effect from its about page.

try to move your mouse cursor on the turtle picture from tortoise GIT – About
its more like we are playing out finger on a water.
Does anyone know how to do make that kind of water effect in Delphi ?
See Leonel Togniolli’s “Water Effects” at efg’s lab.
The ripple effect is based on 2D Water Effects in December 1999 Game Developer Magazine Article
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The algorithm is described in here 2D Water, as mentioned by François and as a reference in the source code.
Leonel’s implementation is partly based on the gamedev article the-water-effect-explained by Roy Willemse. Here is also pascal code.
There is one more Delphi example at efg’s called “Ripple Project”, a screen shot is shown below.