(icon is made by Gonz Devour, thanks)
Step behavior is extracted from custom movement behavior. It can interpolate points linearly between two points.
Here is an example.
To use step behavior,
1. Add step behavior below any movement behavior like 8direction, platform.
<img src="http://i1081.photobucket.com/albums/j352/rexrainbow1/screen1.png" border="0">
2. Create some trace points in event sheet like
<img src="http://i1081.photobucket.com/albums/j352/rexrainbow1/screen2.png" border="0">
- property "Noise shift": shift the interpolation points by a random distance(pixel), 0 is no noise shift.
- action "Force stepping": user can move sprite by "Set X","Set Y" then call "Force stepping" to create the moving trace in a tick.