//PascalABC.NET 3.1 сборка 1239
uses
GraphABC;
const
side = 15;
var
i: integer;
begin
Window.Init(0, 0, 200, 200, clLightBlue);
Window.CenterOnScreen();
SetBrushColor(clBlue);
for i := 100 to 150 do
begin
ClearWindow(clLightBlue);
Rectangle(i - side, i - side, i + side, i + side);
Sleep(50);
end;
end.