deform a flat grid/mesh in opengl

i need to deform a mesh/grid (only in 2d z remains same) in opengl

by deform i mean user will use mouse or touch and drag a particular vertice and rest will follow

here is a link ( http://www.gamasutra.com/view/feature/3432/2d_surface_deformation.php) that explains exactly what i ne开发者_C百科ed but it looks too hard for me to implement myself, can anyone point me to a resource or suggest a simpler way (by using some graphics library or something) it would be great

This has nothing to do with the graphics library of your choice, OpenGL or any other. It is a matter of physics simulation so you need a physics library. Look at this one.