1. A method of a stimulation parameter selection machine, the method comprising: displaying, by a processor of the machine, via a display device, and in relation to a displayed model of a leadwire, an initial current field corresponding to a first stimulation parameter set; in response to user input, shifting, by the processor, the display of the current field with respect to the displayed leadwire model; determining, by the processor, a second stimulation parameter set that results in the shifted current field; and at least one of (a) outputting the second stimulation parameter set, and (b) setting a stimulation device with the second stimulation parameter set, the stimulation device configured for performing a stimulation (1) using a leadwire modeled by the leadwire model and (2) in accordance with the second stimulation parameter set, wherein the user input is via selection of a component, each selection of which being interpreted as an instruction to shift the displayed current field.