I'm making a tank rig,I need to computer distance between new position and last position

Unfortunately there are no OnReleas, OnPress parameter events to store the last parm value. But you can compare time delta(cached/current time) with a tolarance value, which is not perfect but gives you a similar effect.

In the hip / embedded hda / scripts / python module you will find a constant MAX_TIME_DELTA, which is the tolarance value in milliseconds. Currently it is set to 300, you can play with it to find a sweet spot that might work for you.

If you more up to get distance while moving something in the viewport you can impliment hou.ViewerDragger [www.sidefx.com]. See drag_delta.hip example.

vikus
Unfortunately there are no OnReleas, OnPress parameter events to store the last parm value. But you can compare time delta(cached/current time) with a tolarance value, which is not perfect but gives you a similar effect.

In the hip / embedded hda / scripts / python module you will find a constant MAX_TIME_DELTA, which is the tolarance value in milliseconds. Currently it is set to 300, you can play with it to find a sweet spot that might work for you.

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If you more up to get distance while moving something in the viewport you can impliment hou.ViewerDragger [www.sidefx.com]. See drag_delta.hip example.

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Thank you very much!
I'll try it!