The present invention is directed to ion triggerable, water-dispersible cationic polymers. The focus adjustment mechanism is driven such that a projection image is properly focused onto the projection plane in accordance with the distance between the projection plane and the emitting position. Beam current measurements are obtained from the tuned ion beam. In order to quickly render and hit-test the transformed nodes of the window tree, a stack-based implementation of the \u201cpainter’s algorithm\u201d is utilized to achieve fast rendering. The implant may be formed of a plurality of interconnecting bodies assembled to form a single unit. A method for treating an inflammatory skin condition using the administration to the skin of a mammal of the pharmaceutical composition.