Exploring motion streak drawing in SpriteKit with Swift.
Based on the sample from Matthijs Hollemans.
Motion streak code using SKShapeNode that didn't make it into the Ray Wenderlich book iOS Games by Tutorials.
Relies slightly on SKTUtils extensions portions copied into this repo so the sample compiles.
To jazz up the effect a bit we have a sprite which enlarges to show the touch point you are dragging from.
