For applying friction proportional to the particle's current velocity 更多...
| 导入语句： | import QtQuick.Particles 2.0 |
| 继承： |
A drag will be applied to moving objects which is this factor of their current velocity.
The drag will only be applied to objects with a velocity above the threshold velocity. The drag applied will bring objects down to the threshold velocity, but no further.
The default threshold is 0
