- xStep
- The X offset delta from one screen to the next one
- yStep
- The Y offset delta from one screen to the next one
For applications that use multiple virtual screens showing a wallpaper, specify the step size between virtual screens. For example, if the launcher has 3 virtual screens, it would specify an xStep of 0.5, since the X offset for those screens are 0.0, 0.5 and 1.0